HomeMy WebLinkAbout9A - 2020 Comprehensive Plan
MEETING DATE:
AGENDA #:
PREPARED BY:
REVIEWED BY:
AGENDA ITEM:
DISCUSSION:
CITY COUNCIL AGENDA REPORT
APRIL 5, 1999
9A
JANE KANSIER, PLANNING COORDINATOR
DONALD RYE, PLANNING DIRECTOR
32-
99-~
CONSIDER APPROVAL OF RESOLUTION
APPROVING THE 2020 COMPREHENSIVE PLAN
History: Minnesota Statutes require all that cities and counties in the
metropolitan area submit a 2020 Comprehensive Plan to the
Metropolitan Council by December 31, 1998. The Metropolitan
Council granted the City of Prior Lake an extension to this deadline to
May 1, 1999.
Current Circumstances: Most of the City of Prior Lake 2010
Comprehensive Plan is consistent with the Metropolitan Council
Regional Growth Plan. There are some components of this plan which
must be updated to reflect the 2020 planning period. These include the
transportation, sanitary sewer, and some of the land use components of
the plan. The attached summary outlines the changes to the
Comprehensive Plan for the 2020 version.
Since the City adopted a Comprehensive Plan in 1996, relatively few
changes were required for the 2020 Plan. City ptaff engaged
consultants to update the transportation and sewer components of the
plan. In general, the consultants updated the projections in the plan,
utilizing most current population projections, and extending the current
projections to the year 2020. This update resulted in only minor
changes to the plan. One of the new components to the 2020 Plan is
the use of the "floating" MUSA concept. A "floating" MUSA allows
the City to allocate a certain acreage to development with public
services, subject to specific criteria, without a fixed MUSA line as
shown in the current plan. The advantage of this approach is to allow
the City to authorize development of land based on its availability. It
is much more flexible than a fixed MUSA line in that continuous
amendments are not required to add land to the MUSA area unless the
City exceeds the maximum acreage allocation.
The Planning Commission reviewed the changes to the Plan over the
last several months, and held a public hearing on the 2020 Plan on
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16200 Eagle Creek Ave. S.E., Prior Lake, Minnesota 55372-1714 / Ph. (612) 447-4230 / Fax (612) 447-4245
AN EQUAL OPPORTUNITY EMPLOYER
FISCAL IMPACT:
ALTERNATIVES:
RECOMMENDED
MOTION:
REVIEWED BY:
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March 22, 1999. The only testimony on this plan concerned the need
for additional wells to supplement the City water supply. The Plan
addresses the need for these wells by the year 2005.
One additional change will be made before the final Plan is printed.
Currently, the City's' Strategic Plan and Vision Statement are included
in the text of the plan. It is our intent to move this to an appendix and
reference the appendix in the text. By doing this, we will be able to
continue to update the Strategic Plan and Vision without having to
amend the Comprehensive Plan every time the Strategic plan is
amended.
The Issues: The attached resolution is the City's formal approval of
the 2020 Comprehensive Plan. Once the City Council has approved
the plan, it will be transmitted to the Metropolitan Council for review
and approval.
Conclusion: The 2020 Comprehensive Plan is mandated by statute.
The recommended changes will bring the City's current plan into
compliance with the statutory requirements.
Budfet ImDact: The recommendations included in the
Comprehensive Plan are consistent with the City's CIP program. No
additional expenditures are necessary.
The City Council has three alternatives:
1. Adopt Resolution 99-XX approving the City of Prior Lake 2020
Comprehensive Plan.
2. Deny Resolution 99-XX.
3. Defer this item and provide staff with specific direction.
The staff recommends Alternative #1.
A motion and second adopting Resolution 99-XX approving the 2020
Comprehensive Plan.
Page 2
RESOLUTION 99-XX
A RESOLUTION OF THE PRIOR LAKE CITY COUNCIL ADOPTING
THE 2020 COMPREHENSIVE PLAN FOR THE CITY OF PRIOR LAKE
PURSUANT TO MINNESOTA STATUTES 462.351 TO 462.364
MOTION BY: SECOND BY:
WHEREAS, the City Council of the City of Prior Lake adopted the Comprehensive
Plan of the City of Prior Lake in June, 1996, and subsequent
amendments to said plan, and
WHEREAS, changing conditions and legal requirements created the need for
modifications to the Comprehensive Plan for it to be responsive to new
development trends and community policy, and
WHEREAS, the City utilized staff and consultant resources to prepare an updated
version of the Comprehensive Plan for consideration by the Planning
Commission, and
WHEREAS, the adoption of the 2020 Comprehensive Plan will insure a safer, more
pleasant and more economical environment for residential, commercial,
industrial and public activities and will promote the public health, safety
and general welfare, and
WHEREAS, said plan will prepare the community for anticipated desirable change,
thereby bringing about significant savings in both private and public
expenditures, and
WHEREAS, the 2020 Comprehensive Plan has taken due cognizance of the planning
activities of adjacent units of government, and
WHEREAS, the 2020 Comprehensive Plan is to be periodically reviewed by the
Planning Commission of the City of Prior Lake and amendments made,
if justified according to procedures, rules and laws, and provided such
amendments would provide a positive result and are consistent with
other provisions in the Comprehensive Plan, and
WHEREAS, the Planning Commission has comprehensively studied the 2020
Comprehensive Plan and has conducted public hearings on the Plan on
March 22, 1999, following publication of notice as required by
Minnesota Statutes 462.355, Subd. 2 to determine the need for the Plan
and its effect on the community, and
16200 ~~gY~6~k~U)\~~t~~~g:.~'19~or Lake, Minnesota 55372-1714 / Ph. (612) 447-4230 / Fax (61~g4d7-4245
AN EQUAL OPPORTUNITY EMPLOYER
WHEREAS, the Planning Commission has recommended the City Council adopt the
2020 Comprehensive Plan consisting of the public hearing draft and
Planning Commission recommendations to the draft.
NOW THEREFORE BE IT RESOLVED, by the City Council ofthe City of Prior
Lake that the 2020 Comprehensive Plan is hereby adopted by the City Council subject to
the review and approval ofthe Metropolitan Council.
Passed and adopted by the City Council this 5th day of April, 1999.
YES
NO
Mader
Kedrowski
Petersen
Schenck
Vacant
Mader
Kedrowski
Petersen
Schenck
Vacant
{Seal}
City Manager,
City of Prior Lake
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Page 2
CITY OF PRIOR LAKE
COMPREHENSIVE PLAN UPDATE
SUMMARY
Chapter 1. Overview
This Chapter lists the purpose of the plan and its basic elements. There are very few
changes to this chapter. The changes made include:
1. An update of the Mission Statement and Vision adopted by the City Council.
2. A note that the City has incorporated the "floating MUSA" concept rather than the
fixed MUSA line.
3. The section entitled "Status of the Required Plan Elements" has been updated to
reflect the work completed since the Plan was adopted in 1996.
A copy of this chapter showing the changes is attached for your information.
Chapter 2. Goals. Objectives and Policies
No changes have been made to this chapter. The adopted goals, objectives and policies
are current, and remain as written.
Chapter 3. Land Use Guide Plan
This chapter includes both minor and substantive changes. Some of the minor changes
include:
1. Updating the Zoning Districts identified in each of the use designations to correspond
with the districts in the new Zoning Ordinance.
2. Updating the population projections in the Housing Element ofthe chapter to identify
the most current projections to the year 2020.
Changes have also been made to the Land Use Plan Map. Some of these changes reflect
amendments to the map since the original plan was adopted in 1996, such as the addition
ofthe annexed area. The major changes to the map are in the CSAH 42 corridor, and are
a result of earlier discussions by the Planning Commission. A copy of the revised map is
attached to this report.
Another major change is in the section titled "Staging MUSA Extensions". This is the
section which discusses the rationale and the criteria for the "floating MUSA". We have
16200 ~~~?:e?r~k~u~~te~~~?i.g~iake, Minnesota 55372-1714 / Ph. (612) 447-4230 / Fax (61~ig4J7-4245
AN EQUAL OPPORTUNITY EMPLOYER
also included a map which identifies the primary areas of MUSA acreage allocation. A
copy of this section and the map is attached to this report.
Chapter 4. Transportation
The obvious changes to the Plan are the change in forecasts and update to the projections.
There are no changes to the plan recommendations, other than to update the CIP projects.
A copy of the Transportation element is attached.
Chapter 5. Parks and Trails
The changes to this chapter are primarily a result of the adoption of the referendum in
1997. The plan has been updated to include the purchase of the Busse property for a
regional park and the Kop farm for an addition to Lakeside Park. The plan has also been
updated to include the improvements made since 1996, including additional trails,
playground equipment and so on. A section of this chapter detailing the existing system
and future improvements is included.
Chapter 6. Surface Water Manaeement
No changes have been made to this plan, since the current plan complies with the
Metropolitan Council criteria.
Chapter 7. Sanitary Sewers
The update to the plan did not significantly change the sewer projections for the City.
The chapter, however, has been modified to include the detail required by the
Metropolitan Council.
The chapter has also been updated to include an element on the treatment of on-site
sewage disposal systems. The Metropolitan Council has mandated that the City prepare a
management plan for these systems. The City is working with Scott County to develop
an agreement which would allow Scott County to take over this management. This
agreement is beneficial to the City since Scott County has the available resources in
place, while the City does not. A copy of this element is attached.
Chapter 8. Water Supply
The obvious difference between the two versions is change in the planning period. The
update also utilizes the most recent data available. For example, historic water usage is
identified based on 1998 records, rather than on the 1994 information.
In general, the projections discussed in the updated version are very similar to those in the
previous plan. This version reiterates the need for at least two additional wells by the
year 2005. The plan also discusses the restraints on those wells due to the Savage Fen.
While this issue was mentioned in the previous version, this update provides greater
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Page 2
,--i,:-
detail. The 2020 Water Supply Plan also updates the Capital Improvements Program and
the cost estimates for these improvements.
Finally, the section detailing enforcement measures for demand reduction has been
updated to include the 1998 sprinkling ban ordinance.
A copy of this chapter is attached.
Chapter 9. Implementation
The only change to this plan is the mention of the adoption of the new Zoning Ordinance.
No additional changes are required.
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Page 3
-;-
CHAPTER 1
OVERVIEW
JURe, 1996 1999
The City has identified the need and desire to update its Comprehensive Plan as it
experiences continued growth and the impact of developments in neighboring communities, and as
it anticipates related infra-structure improvements including the completion of the new
Bloomington Ferry Bridge and Shakopee Bypass.
This chapter presents information about the purpose of the Comprehensive Plan, the status
of the Plan and related work to update the Plan, and requirements of applicable state laws.
The report identifies the elements and data that are needed to complete the Plan update.
p~OSE OF THE PLAN
The Comprehensive Plan (The Plan) is a guide for the development and redevelopment of
the City. It is both a reflection of local policy as well as the legal document required by Minnesota
Statutes. The focal point is the Land Use Plan element; other elements include a Transportation
Plan, a Public Utilities Plan, a Park Plan, a Housing Plan, a Water Resource Management Plan, and
an Implementation Plan.
The Land Use Plan--often called the Land Use Guide Plan-- represents the official findings
of highest and best use for properties throughout the City. The Plan should be a dynamic and
flexible guide; thus, it is subject to change which may be initiated by land owners or by the City.
The Land Use Guide Plan and map recognize the City's natural and man-made features and
define the future use of the land. Land use classifications are defined and adopted as the statement
of the City's vision for the development of the community.
The development vision is often the ultimate, fully developed City; however, it is typical
that The Plan will set periods of 10 to 20 years with the understanding that periodic reviews and
evaluations will be conducted, resulting in updated plans.
~ ~ ~~~l: entilloEl 1ft. "2010 COlIipreftl1B""'. Ph..", ~ ~ -=::.:::.::
::::; ; ~ P ;,.;;;;;; fur eellHBlHlity,devolep"Oftl ~~.:~llO, An RpEloI<l6 plaR
,. hether the IDeas IS en 2010 or en the albmate ee~ deSign.
The current version of the Ian ro oses a framework for develo ment throu h 2020
althomm in some cases the focus is on the ultimate community design.
Comprehensive Plan ~2020
Chapter 1
Page 1
MISSION
The following Mission Statement was adopted by the City Council on February 6J., 199~1:
"The City of Prior Lake is committed to serving the common good of its residents by
promoting, a"umg ather Ihings, community values, environmentally sensitive
community development, robust business growth, financial stability, pttbHe safety,
and diverse recreational opportunities. "
VISION
The Vision of the community at full development was also adopted February 6, 1995, as
part of the Strategic Plan. The ultimate community should be comprised of development which is
balanced among residential, commercial, and other land uses.
PRIOR LAKE STRATEGIC PLAN
THE VISION
Adopted February 6, 1995
Revised February 3. 1997
Revised April. 1998
Revised March. 1999
"At buildout the City of Prior Lake will be balanced between residential,
commercial and business. Strong neighborhoods and homeowner associations will
characterize most developments, neighborhoods will be connected by transportation
amenities for pedestrians and/or motor vehicles. Platting will be encouraged
through ~ Planned Unit Developments Ie which preserve natural features.
While single family dwellings will be the predominant housing type, townhomes (for
empty nesters) and multi-family developments on major arterials are expected.
Annexation will be evaluated and a determination made regarding land areas to
incorporate within the City.
''Neighborhood commercial centers will predominate, although a few community
commercial centers will exist. Commercial development will be localized primarily
to major arterial intersections involving State Highway 13, County Road 42, County
Road 44, County Road 21, County Road 12, County Road 82 and 83. One regional
center is expected at the intersection of County Roads 42 and 83.
"SlIta!ler hwiHes5es ',ri!! he pFedamiHant. The J<.3cus will he en affice, light
il'lSlisms! aHd light lIulHrifaetliRHg. SlItall affiee, ,ral"Chawe, aHd iHsftsmal
developments aro &pcc1cd aJeng CablHty Raad 21. One ay "ta1'C C81'paY(fllc aF
pal'.b al"C cxpeefed. Bftsil'less ceneent-YatiaHS aye &peeled a/ang Statc Highway 13,
Calin!)' Raad 21 and CaliHty Read 12. With respect to business. the focus will be on
develoDing a mixture including office. light industrial. high-tech and lif!ht
manufacturing. Office. warehouse and industrial developments are expected along
Comprehensive Plan ~2020
Chapter 1
Page 2
CR 21. One or more co orate 0 lce arks are ex ected. Business concentrations
are exDected alon~ State Hi~hwav 13. CR 21 and CR 17 and CR 42.
"Services rovided b the communi will be characterized b
will be laced on maintenance and re lacement 0 in
diversified tax base to SUDDort needed f!overnment services.
"Prior Lake is proud to be the home of the Shakopee Mdewakanton Dakota
Community, its tourist attractions and international network of businesses. The
City seeks to work cooperatively with the Dakota Community government toward
mutually beneficial objectives. The City emphasizes its historical roots as a small
town resort area with a downtown, and incorporates these historic facts in its
development plans. positive family, individual and community values will be
reinforced.
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:;;:"';;fied /fe< hase ta 3ffppOrt .eokJ g8,.e"'m~: ~:.
"A twofold recreational system will be available. One is characterized as the
recreation industry created by the Mdewakanton Dakota Community. The second
will consist of Prior Lake, Spring Lake and numerous natural areas dedicated to the
public to preserve their natural features. These major areas will be augmented by
community parks, play fields, neighborhood parks and trails. These facilities will be
programmed for recreation directed toward all ages and interests.
"The City will plan for and facilitate remodeling of areas requiring redevelopment
along a consistent theme as appropriate. Prior Lake's economy is not subject to
down turns caused by excessive reliance on one industry or another. "
This Plan reflects and builds upon the several "Vision Elements" contained in the Strategic
Plan; they include:
Transportation Commercial
Housing Redevelopment
Public Services Social Structure and Leadership
Financial Community Recreation
TouristlRecreation Industry and Dakota Community
The Strategic Plan Vision has been incorporated into the Goals and Objectives and pertinent
items are also found in the Land Use Guide Plan and other elements of this Plan.
Page 3
Comprehensive Plan ~2020
Chapter 1
RELATIONSHIP AMONG PLAN ELEMENTS AND IMPACT OF CHANGE
The Land Use Guide Plan and map may viewed as the hub of a spoked wheel, with the
spokes reaching to the other elements of The Plan. The Land Use Guide Plan is the base upon
which the other elements are built; the elements are very inter-dependent.
The Transportation Plan and the Public Utilities Plan are critical elements for a developing
community, not only because they identify infrastructure improvements that will be needed to
support development, but because they identify the relationship with the systems of other
jurisdictions including the Metropolitan Council, the State, and the County.
All changes to The Plan are subject to review by the Metropolitan Council which has
approval authority over amendments which are found to have an effect upon metropolitan systems
which include sanitary sewer and transportation.
Changes to the Land Use Guide Plan have a "ripple effect" upon the other elements of The
Plan; the impacts are not necessarily negative, but they are often deemed to be "major" rather than
"minor" when they involve reclassification of undeveloped land. It is fortunate that issues
concerning transportation and utilities are quantitative, e.g., traffic generation and the service levels
of existing and proposed roads and highways; and, waste generation rates and capacity of treatment
and disposal systems (assigned and actual).
The impact of proposed land use changes upon these systems can (and should) be calculated
and evaluated before the changes are finalized. Changes to the other plans may also be required;
the fiscal impact of capital improvement costs for development is a critical to sound planning.
This directly relates also to the Metropolitan Urban Service Area (MUSA) designation
which governs the timing of the City's future development. The City esm19letea a esm19loJ{ fJFeeess
of ameaaiflg the AIDS.'\. aesigBatisa to fJFe';iae for the 'Hilas aeyelopmeHt, Fffiiefl sf '.vbieh was
oatsic:le the AlliS}... Lseatisa relative to the AIDS.^.. B€nmaary is a key iadieator of timiag of
development. The previous plans adopted by the City designated a fixed MUSA line: development
ofland outside ofthis line was not allowed without an amendment to the MUSA designation. This
version of the Plan incoIJ>orated the concept of a "floating MUSA". This concept essentially
identifies a total number of acres which may be developed. The criteria for determining whether
land is suitable for development is discussed in Chapter 3 of the Plan.
Fiscal impact of land use plan changes and of future development is an important
consideration in areas other than roads and sewers. The costs of added personnel (typically the
largest single budget item) and capital equipment and buildings should be evaluated.
Land Use Guide Plans should be "broad brush" and the boundaries on the Land Use Map
should respect major natural and man-made features, but should not be drawn to design sites or
reflect private ownership. Zoning Maps delineate districts along property and right-of-way lines,
generally following the corresponding areas on the Land Use Guide Plan map.
Comprehensive Plan ~2020
Chapter 1
Page 4
THE CURRENT PLAN
::;: a:~1 =:"' ooOl'led Hi 1981115 the llfldnle aflll.a ~~~l=::;:::e =
~~ ~:;;; '~,;;~i;" ~~ Plomiftg Act. The P~~~ ~.:c;~ .:;,~;:eme
. t S, at ha'/El BeeR re'/lS1ens te the LaRa Use Gmee FlaB: ffi~. The City first
adorted a Com rehensive Plan in 1973. This Ian was u dated in 1981 and a ain in 1996. The
2020 Plan is mandated by the Metropolitan LandPlanninlZ Act.
The Plan is comprised of the following e1emoo.ts or chapters:
Natural featl:1res Goals,
Obiectives and policies
Land Use Plan
Public Utilities
Implementation
ExistiRg Develeflffient
Transportation
Parks and Trails
=. ~::. =: = ~s-= Ol<istiRg t~"!!~~ :: :::=
=01_ ..; ,t sa: . ..<fa IlnBdat oB<l water reelwge .....; "::etIoB<l
. ~; d;;cl~iRg; seaimeffiatieR; slepes; aRa pedestflaR links. The Goals. Obiectives and Policies
Cha ter includes the Ci oals as the relate to Housin and Environment Economic Vitali
Security. Access. and Human Development.
City at :~=:::':::~::=;.7=~::id;e::~":t~;:,~=a1ft=::;':~U:
reserves for the LaRd Use PlaR Element.
The Land Use Plan Element has several sub-sections: Development Coneept
Classifications for both residential and commercial development; Land Use Goals for both
residential and commercial development; the Land Use Plan Mill! wilieh eeRtaiRs fmmeoo. flelieies;
Housing, which is often referred to as the Housing Plan and which contains further sub-sections on
Housing Goals, Housing Policies, and Housing Implementation Program; and NeigflBorheeds;
Protection Element which addresses the natural features; 8elar :\eeess Preteetien wilieh has the
sub se6tieIls of Se1ar .\66ess Geal, Solar .^..eeess Peliey, 8elar .^..eeess PlaR, aRa 8elar .^..eeess
Monitering MUSA staging: and Orderlv Annexation.
The Transportation Element has sub-sections on Thoroughfares; Functional Classification
System; Pedestrian and Bicycle System; Mass Transit; and Aviation.
The Public Utilities Element contains saB sections includes chapters on the Sanitary Sewer
System; Extensions of 8anitary 8e'.ver; Storm Water Management Plan; and Water Distribution
Plan; aRd Orderly :\Ilflexatian :\rea; this elem.eRt eontaffis six pelieies.
The Parks and Open Space Element refers to the 1977 Comprehensive Park and Open
Space Plan.
Comprehensive Plan ~2020
Chapter I
Page 5
The Implementation Element includes: Capital Improvement Program; Housing; Official
Controls; and Subdivision Ordinance.
Comprehensive Plan ~2020
Chapter 1
Page 6
RELATED CITY MATERIALS
The City has developed two planning products which will serve as resources in updating the
Comprehensive Plan. The City Council adopted a Strategic Plan in early 1995, and the City staff
preflaFea a draft an updated plan--"The 2010 Plan"- wbieR has seeR re'lie'.'/ed 8.fld disel:lssed with
the PIB:l'ffiiRg Cemmissiofl over sey/eral years adopted in 1996.
The Strategic Plan contains a Mission Statement and a description of The Vision for the
City's future. The Plan contains Vision Elements which will be incorporated, as appropriate, with
the Comprehensive Plan elements. The Vision Elements include:
Transportation Commercial
Housing Redevelopment
Public Services Social Structure and Leadership
Financial Community Recreation
TouristlRecreation Industry and Dakota Community
The t=1raft 2010 Plan will serve as a base document and will be editorially revised to create a
contemporary plan that reflects the City's visions and policies and to resolve any deficiencies
relative to required and desired information.
REQUIRED PLAN CONTENTS
The State Law addresses municipal planning in two places: the municipal planning
enabling act which deals with comprehensive planning, zoning, and subdivision regulation; and, the
Metropolitan Land Planning Act which specifically focuses upon comprehensive planning by
municipalities in the seven-county metropolitan area. The "Comprehensive Plan Content" is
prescribed in the Statutes, Section 473.859.
Comprehensive plans shall contain objectives, policies, standards and programs to guide
public and private land use, development, redevelopment and preservation for all lands and waters
within the City "through 1990 and may extend through any year thereafter which is evenly divisible
by five."
The law requires that the Comprehensive Plan specify expected industrial and
commercial development, planned population distribution and local public facility capacities
upon which the plan is based.
Also, the law requires the plan to contain a discussion of the use of the public facilities
specified in the Metropolitan Systems Statement which is information regarding the City's
relationship to the Metropolitan Systems (transportation, transit, airports, sewers, and regional
parks). These Statements were submitted to the City by the Metropolitan Council initially after the
Act was passed and subsequently as the statements were updated and revised. Further, that
discussion is to include the effect of the plan on adjacent local governments and affected
school districts.
Page 7
Comprehensive Plan ~2020
Chapter 1
The law requires the Comprehensive Plan to include several elements (also referred to as
Plans and Programs). The required principal and subordinate elements are:
A. Land Use Plan. This is commonly referred to as the Land Use Guide Plan which includes
a map. This plan is to designate the existing and proposed location, intensity and extent of
the use of land and water for agricultural, residential, commercial, industrial and other
public and private purposes, or any combination of such purposes. The Land Use Plan is to
contain:
1. Protection Element. The law requires this element, "as appropriate" for:
A. Historic Sites and
B. The Matters Listed in Section 473.204. That section lists ten environmental
protection items for the regulation of the use and development of the land and water
(See Exhibit A).
2. Element for Protection and Development of Access to Direct Sunlight for Solar
Energy Systems.
3. Housing Element. This is to contain standards, plans and programs for providing
adequate housing opportunities to meet existing and projected local and regional
housing needs, including but not limited to the use of official controls (e.g., zoning and
subdivision regulations) and land use planning to promote the availability ofland for the
development oflow and moderate income housing.
B. Public Facilities Plan. This plan is to describe the character, location, timing, sequence,
function, use and capacity of exiting and future public facilities of the City. It is to be
detailed to the extent necessary to establish existing of potential effects on or departures
from metropolitan system plans and to protect the metropolitan system plans. The plan is to
contain at least the following elements:
I. Transportation Plan. This is to describe, designate, and schedule the location, extent,
function and capacity of existing and proposed local public and private transportation
services and facilities.
2. Sewer Policy Plan. This is to describe, designate, and schedule the areas to be sewered
by the public system, the existing and planned capacities of the public system, the
standards and conditions under which the installation of private sewer systems will be
permitted, and to the extend practicable, the areas not suitable for public or private
systems because of public health, safety, and welfare considerations.
3. Parks and Open Space Plan. This is to describe, designate, and schedule the existing
and proposed parks and recreation open spaces within the jurisdiction.i
Comprehensive Plan ~2020
Chapter 1
Page 8
4. Water Supply Plan. This is a requirement added to the law which requires a plan to be
submitted by January 1, 1996. The plan is to include a number of specific information
categories (See Exhibit B).
C. Implementation Program. This Element is to describe public programs, fiscal devices
and other specific actions to be undertaken in stated sequence to implement the
Comprehensive Plan and to ensure conformity with the metropolitan system plans. It is to
be detailed to the extent necessary to establish existing of potential effects on or departures
from metropolitan system plans and to protect metropolitan system plans. The Element is
to include at least the following:
1. Description of Official Controls. The law defines "Official Controls" as ordinances
and rules which control the physical development of the City and which implement the
general objectives of the Plan. The controls may include ordinances establishing
zoning, subdivision controls, site plan regulations, sanitary codes, building codes and
official maps.
2. The Description is to at least address zoning, subdivision, water supply, and private
sewer systems; and a schedule for the preparation, adoption, and administration of such
controls.
3. Capital Improvement Program for transportation, sewers, parks, water supply, and
open space facilities.
4. Housing Implementation Program including official controls to implement the
housing element of the land use plan, which will provide sufficient existing and new
housing to meet the City's share of the metropolitan area need for low and moderate
income housing.
The City may designate five year urbanization areas and shall specify in the Capital
Improvement Program the timing and sequence of major local public facilities and in the
Implementation Program official controls which will insure that urbanization occurs only in
urbanization areas and in accordance with the plan.
OTHER REOUlREMENTS
The State Law requires all Comprehensive Plan amendments to be submitted to the
Metropolitan Council for review (after hearing and recommendation by the Planning Commission
and after consideration, but prior to final adoption by the City Council). The Metropolitan Council
is charged with evaluating the City's Plan in terms of consistency with and impact upon the
metropolitan systems.
The Council adopted its "Regional Blueprint" in September, 1994, pursuant to State Law; it
serves as a policy guide for determining the degree to which City plans are consistent with the
regional goals and policies. This document and other materials published by the Council will be
used as references during the preparation of the updated Plan.
Page 9
Comprehensive Plan ~2020
Chapter 1
State Law requires the City to conduct public hearings on all amendments and to submit
copies to adjacent units of government and school districts for review. Hearings can be held on
separate elements or on the Plan as a unit.
COMPLETING THE PLAN UPDATE
The City has initiated several projects designed to produce updated Plan elements and
relevant information. The following is an outline of the status of the several required items and of
recommended items which are intended to produce a complete and relevant Plan.
Status of Required Plan Elements
1. Land Use Plan--the tH=aft 2010 Plan is being revised and reformatted to serve as the base
document for the entire 2020 Comprehensive Plan; material in the draft and new
information will be identified as the Land Use Plan which will include the guiding for
expected development and uses.
There are se'leral imflertaffi meets that ...:ill likely re(jl:lire s1:1bstantial 1'6';iew and hearing
time. The City aeeds to aetermiae the flrefmed l:lse ef land fer the flfejeeted fleriod, i.e.,
threHgh 2010, at least. The City COlmeil hes efldersed a smdy that identifies futuro
eommercial and inal:lstflal 8:fees; ae speeifie deliberatien or smdy has BeeR eoadueted
regafliing residentiall:lses greater than si.egle fa.m..ily eh....elliegs.
fJse, the City has anticipated the iacefflafatiea ef an 1:Ifbanizatiaa fllBfi that ':;ill il'ltlieate
how the City wal:lld stage aeveloflment and the e3{'flaRsioa ef the Metropelitan Urban
Serviee :\rea a'ler the flrojeeted fleried. Staff hes flrepared seme fl1'61imiB.ary flrejeetiens
that geReftllly aeee1:IDt fer the lme'.\'fl. eaflaeity ef the se'::er intereefltefs and the land areas
that eOl:lld legieally aRd eeenemieally Be served. There 8:fe majer fleliey eeRsideFatiens,
however; the RegieBal BIl:lepriRt disel:lsses hew 8fH.ea€lments te the MUSA ...:ill Be 1'6Y::~:d
and e'/all:lated, and there may Be legislatien that fur-.her eenstFaiRs the leeel eeRtrol 0
de'/elopmeBt iR the City.
Sta-ff and the eansl:l1tant ha-ve ideatified Reeded ehaRges te the laRd lise eategeries Plan
~~~~e as well as the key iRfermati0R ea the Land Use Gl:lide PlaR Map. Imfll'eVOO
~~S:~~~~~~ ~afermatieR '.vill flFeyide a s01:IDd Besis fur elarif)1Rg the 1'6speeti''; z~~;
olasslfieatleRs.
2. The protection elements for historic sites and for environmental features will Be identified
es a sepefftte element are included in the Plan.
3. Housing ElementJPlan: this will be a sepefftte elem.eRt. The City retained a eeflsultant in
;;:~_~~ !r::'~Bted re'/ised fi~diRgs and flrelimiB~ ree0mmeBdatieBs to the PI=~
COHlflllSS10B 1ft the Fall. The CIty has adopted an Action Plan. with goals consistent with
the Livable Communities Act. The Action Plan is incoz:porated into the Plan.
Comprehensive Plan ~2020
Chapter 1
Page 10
~ ~ona1 B1a"l'rint aad lBe Livable c.RlIffi!fIitie, Ml will reqaire ad<Ra.na1 work t.
a e the Aetll:)R P1aR for hOl:l5ffig ae'/elopmoot.
4. Public Facilities Plan. Several elements are involved:
A. Transportation Element. An dFaft updated plan was prepared in 199~. It has Been
:~t~~.:i=::';::':Or ~.~:~.:.::~:~
=.z ~=:d:. ::;;;a .,;: ~~~:= "::I~
The information in this element was u dated in 1999 and forecast were extended to the
year 2020.
B. Sewer Policy Plan. The City has had a consultant prepare the updated Sewer Plan; this
is a key part of the Comprehensive Plan in that it identifies the physical design aspects
of future service to now rural areas.
C. Parks and Trails Plan. Staff initiated preliminary reviews of this element, including a
review of various policies as to park usage and projected needs
D. Water Supply Plan. The City has had a consultant prepare this element. It is a key part
of the Comprehensive Plan not only from the standpoint of ensuring an adequate supply
for consumption and business, but to ensure proper supply and pressure for fire fighting.
5. Implementation Program. Several elements are involved:
A. Official Controls. The various regulatory devices are described, i.e., zoning and
subdivision ordinances, protective inspection codes and policies, and special controls
such as environmental protection districts (wetlands, shorelands, and floodplains).
B. Capital Improvement Program. This is a five year plan that encompasses transportation,
sewers, parks, water supply, and open space facilities. It may be considered separately
as it traditionally has been with an annual review. The Metropolitan Council has
viewed updated Capital Improvement Plans as editorial revisions rather than major
amendments.
C. Housing Implementation Program. This is included in the Housing Plan Element.
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Comprehensive Plan ~2020
Chapter 1
Other Elements and Information
The State Law refers to the broad topics of objectives, policies, standards, and programs.
The practical application of this can take several forms; the following are recommended for the
City:
1. An element of Goals and ObjeCtives 'Nill be has been prepared. The Strategic Plan
Mission and Vision statements and elements are incorporated. Other goals and
objectives, and even the criteria for achieving them, are listed in succinct categories.
The benefit of this distinct element is that all other elements are tied to it. This ensures
consistency throughout the Plan and it is helpful when the City finds it appropriate to
review and evaluate the guiding principles for the City's development.
2. A separate element or distinct sub-element in the Land Use Plan addresses the features
and conditions in the City that represent development assets and constraints
3. The c:iFaft 2010 Plaa eoataias a sepamte seetioR for the joiRt relatiaBs 191aR regardiRg tho
~~or~ Mde>.vakantoR Siaw, CefHIlRillity. This is &19PFepriate giveR ;; ~;; ;tatus
ofilia lana ift'leIYea aRa sigaifieaaee efthe laRa 1:15e5.
COMMUNITY STRUCTURE
This Plan emphasizes neighborhood planning through the use of planning districts that
focus on smaller areas of the community.
A series of hearings were conducted by the Planning Commission during the summer of
1993 to obtain a sense of the community from the residents of the several Neighborhood Planning
Districts identified in this plan. Participants were provided written descriptions of the
Neighborhood Planning Districts, including draft District Objectives prepared by the City Staff.
The observations and recommendations received have been integrated with the appropriate
sections of this plan, primarily in the respective sections regarding the Planning Districts.
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LAND USE - PLANNING DISTRICTS:
The community has been divided into fourteen neighborhood planning districts based upon
the location of arterial streets, lakes, wetlands, steep slopes and other topographic features and
development patterns. The districts provide manageable geographic areas for analysis and
identification.
Sprin2 LakelWillows:
Spring LakefWillows, in the southwestern portion of the City, covers approximately 300
acres, bounded on the south by State Highway 13, on the west by Spring Lake, on the north by
Prior Lake, and on the east by the rear lot line oflots that front on the west side of Willow Lane and
the drainage area between Inguadona Beach and the Willows Subdivision. The neighborhood is
divided into areas that are north and south of 170th Street.
The neighborhood contains some of the community's oldest subdivisions and its history is
related to the resort community that once was the focal point for the community. The District is
bounded by Prior Lake to the northeast and Spring Lake to the southwest.
The major roads within the District are 170th Street (County Road 12), Sunset Trail
(County Road 81) and State Highway 13.
There are compatibility problems within the District due to the prevalence of small lots that
are located adjacent to the County Roads and State Highway. Inadequate buffer areas, lack of
pedestrian and bike trails and direct driveway access to the regional roadways are the major
development issues within this neighborhood.
A majority of the neighborhood has been developed with low density single family lots.
Limited higher density housing opportunities may be available adjacent to both State Highway 13
and 170th Street through Planned Unit Developments.
Future development should include buffer areas adjacent to the County Roads and State
Highway 13 which incorporate design options such as greater lot sizes, building setbacks, berms
and dense screening to protect residents from the impacts associated with the roadways.
A trail system that connects existing neighborhoods to the parks, State Highway 13 trails,
Five Hawks Elementary School and public lands adjacent to Prior and Spring Lakes are important
potential improvements for this neighborhood. Future development should emphasize the
historical, recreational, resort, and natural features that are characteristic of this area.
The neighborhood's only commercial district and its major entry point is southwest of the
intersection of 170th Street and State Highway 13. The limited business district contains
nonconforming uses, and unplatted land. The uses have direct access to State Highway 13 which
should be eliminated with any future platting activity. Future redevelopment activity on this highly
visible comer should be neighborhood oriented.
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Comprehensive Plan ~2020
Chapter 1
The intersection of County Road 81 and State Highway 13 is a major entry point into the
community. An entrance feature and landscaping should be placed near this intersection to identify
the City's boundary and to create Prior Lake's sense of place.
DISTRICT OBJECTIVES:
1. Incorporate buffer areas with development of properties adjacent to County Road 12, and State
Highway 13 that will protect residential development from noise and litter and will provide
separation from business uses.
2. A trail system should link neighborhoods to the business district, Five Hawks Elementary
School, public parks, Prior and Spring Lakes and Spring Lake Regional Park.
3. The business district should be upgraded to provide effective pedestrian and traffic circulation.
Area redevelopment should eliminate the private drive access to State Highway 13 and the
non-conforming uses should be replaced with permitted uses. Landscaping, paved parking,
sidewalks, and attractive building design should be featured.
4. A local road should connect 170th Street to State Highway 13. A frontage road connecting
170th Street to Five Hawks Avenue should be provided as part of the ring road circulation
system.
5. The intersection of County Road 81 and State Highway 13 should be featured with a
monument.
Five Hawks:
The Five Hawks neighborhood was named in honor of effigy mounds in the vicinity of Five
Hawks Elementary School. This early Indian artifact was destroyed by development and grading
in the area.
The neighborhood is bounded on the west by housing adjacent to Willow Lane, on the
south by Highway 13, and on the north by County Road 21. There are approximately 380 acres and
the neighborhood is over 80% developed at a density range from 2.5 to 18 units per acre. The
neighborhood is characterized as a transition area between the lower density Willow Lane area and
higher density County Road 21 area.
Several marshes and wetlands with an east-west orientation divide this neighborhood.
These help filter stormwater runoff before it enters Prior Lake. These features however constrict
traffic movements within the neighborhood and adjacent areas.
North of these natural features is residential development of5 to 7 units per acre which does
. not conform to current zoning standards. This neighborhood has about one mile of lakeshore; there
is no public access.
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The Willows Park and the County Road 21 trails are the only public spaces in this
neighborhood. The private marina on Green Heights Trail is one of two facilities on Prior Lake.
The residential area south of the marina/restaurant on Green Heights Avenue has a density
of about 2.5 units per acre despite significant development constraints. There are sites in this area
and elsewhere in the neighborhood that warrant evaluation to determine whether the land use
classification and zoning adequately reflect the physical constraints.
Traffic circulation could be improved to connect the north and south halves of this
neighborhood.
There are two commercial nodes in this neighborhood. A portion of the Town Center is
located directly south of the intersection of Highway 13 and County Road 21. The other node
consists of the post office, bank, and lumber yard directly south of the intersection of Anna Trail
and Highway 13.
The downtown node is a highly visible and accessible area with a mix of new and old
structures, with little or no continuity in design and aesthetics. The increasing number of traffic
control devices on Highway 13 and County Road 21 will tend to isolate this node from other
business nodes in the community unless circulation improvements are made involving Duluth and
Main Avenues.
The commercial node at Anna Trail and Highway 13 is automobile-oriented. Duluth
Avenue which provides local access to this node is a critical part ofthe ring road system tying this
area to Town Center and the Priordale business district.
DISTRICT OBJECTIVES:
1. A trail system should be established along the District's natural features and roadways to
provide pedestrian and bicycle links throughout the District.
2. The feasibility of a neighborhood park in the north half of the neighborhood should be
investigated; possible sites include the Outlot adjacent to Green Heights Trail and Dutch
Avenue or the City property located on Cates Street.
3. The completion of Five Hawks Avenue should be established as a priority project in order to
improve north-south vehicular movements and the main entrance to this neighborhood from
Highway 13.
4. New residential developments along Highway 13 shall include design elements such as deeper
lots, landscaped berms, fencing, and tree cover to buffer the negative impacts of Highway 13
traffic.
5. Duluth Avenue should be improved with bike trails and sidewalks to provide a pedestrian link
between the three business centers of Town Center, Anna Trail and Priordale.
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Comprehensive Plan ~2020
Chapter 1
6. An east-west street connecting Five Hawks Avenue and Duluth Avenue should be constructed.
Lakefront:
The Lakefront Neighborhood Planning District is clustered around Lakefront Park and
Town Center. It includes a major portion of the Town Center and is bordered on the southwest by
County Road 21, on the southeast by Highway 13 and on the north by Prior Lake. Access from one
part of the neighborhood to the other is via either Highway 13 or through the Park.
One of the findings of recent planning studies is that the City could take better advantage of
the proximity of Lakefront Park to the Town Center. There is a tax increment district within the
downtown and a study of the area by a consultant presents a plan which identifies the block-by-
block transition from business and governmental uses to apartment construction and to single
family lots.
This 375 acre district has developed at a average density ofless than 2 units per acre. Most
land has been developed except where slopes are steep and where storm water management ponds
are exist or will be needed. The future of the Planning District is related to the Town
Center/Government Center and how well it is linked to Lakefront Park and Waterfront Passage.
Residential construction in the area--such as higher density senior citizen housing and
assisted housing including nursing care facilities--is feasible.
DISTRICT OBJECTIVES:
1. Continue improving access to Lakefront Park to better integrate the park with adjacent
neighborhoods, Town Center and other commercial areas, Grainwood Crossing and Waterfront
Passage. A trail system should link all of these areas.
2. Ensure that redevelopment projects in this district include better pedestrian access and
improved traffic circulation.
3. Conduct appropriate traffic generation studies of the intersection of Ridgemont Avenue, Main
Avenue and Highway 13 to determine feasible design alternatives for safer and more effective
automobile stacking.
4. New commercial uses should be effectively screened as a buffer to residential areas. All
transition areas should be landscaped. Parking lots within the Town Center should be
upgraded with striping, landscaping, and curbing.
5. The Waterfront Passage area should be upgraded with the removal of brush adjacent to the
pond located north of County Road 21. Street furniture such as permanent benches and a
fountain installed with lights in the pond should be considered to accentuate the amenities of
the area and to provide pond aeration.
6. The Kop farm should be acquired for Lakefront Park.
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Prior South:
This neighborhood is bounded on the northwest by Highway 13, on the northeast by County
Road 21, and on the south by Spring Lake Township. There is a broad range of residential
densities and a variety of uses within the 400 acres.
The western edge of the district along Highway 13 consists of commercial strip
development and, notably, the Priordale Mall. The center of the neighborhood is residential with
open space and recreational uses.
The City purchased a portion of the agricultural land in the east area of the district and is
promoting development in the new business and industrial park south of County Road 21.
Blind Lake is a recreational development lake in the center of the residential area of this
district. The neighborhood will expand east around Blind Lake and will support residential
development. A north-south street would effectively separate anticipated industrial uses from
residences.
The pond adjacent to County Road 21 east of the intersection of Franklin Trail should be
retained as public open space. Park benches could be installed adjacent to the pond as a resting area
for persons using the trail system.
Approximately one-half of the City's commercial land is in this district. Vehicular access
and mobility among businesses has been a problem. A traffic study for this area revealed the need
for a "ring road" collector street system to tie the various business nodes together. The first phase
of the road was constructed in anticipation of commercial development behind Priordale Mall.
DISTRICT OBJECTIVES:
1. Implement the "ring road" plan to provide vehicle circulation within the commercial district to
reduce and eliminate the use of Highway 13 as a local street.
2. Ensure that neighborhood trail systems tie into the regional system adjacent to County Road 21
and provide access to "The Pond" athletic complex.
3. Complete the development of the industrial park with uses that can serve as a model for
eventual redevelopment in the older developed industrial area.
4. Encourage the elimination of non-conforming uses and upgrade the uses that were developed
before contemporary design standards were adopted.
5. Plan for and undertake the installation of public infrastructure in all the unserviced areas which
are with in the Metropolitan Urban Service Area.
Markley:
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Comprehensive Plan ~2020
Chapter 1
The Markley Neighborhood is located east of Highway 13 and north of County Road 21. It
is close to the Town Center, yet still features a significant amount of agricultural and vacant land.
Prominent uses include Memorial Park, Laker Retail Center, non-conforming businesses along
County Road 44, an elementary school, Prior Manor Senior High Rise, several apartment
complexes, an industrial site and a mixture of single family and multi-family dwellings.
There are several collector roads in this area. Adjacent development should be provided
with buffer areas which incorporate greater lot sizes, setbacks, berms and dense screening to protect
residents from noise and debris associated with the roadways.
This District contains plats dating back to the early 1900's which were part of the Town
Center of Prior Lake prior to the construction of Highway 13. Some of those, located east of
Highway 13 were developed at densities approximating 5 units per acre.
The sixty-five acre industrial area contains several buildings that were annexed in 1973.
The area has not been subdivided and was developed without public sewer and water. Any further
development here should be preceded by the installation of public utilities, since this area is within
the Metropolitan Urban Service Area.
This neighborhood features Markley Lake, several areas of steep slopes and, III the
undeveloped portion ofthe District, the City's municipal water well field.
An intermittent stream with steep slopes links a marsh southwest of County Road 21 with
Markley Lake as a natural barrier which will separate residential from industrial development.
Development proposals should be carefully evaluated to preserve the maximum amount of
site amenities and to assure that public open space is provided to the lakeshore.
DISTRICT OBJECTIVES:
1. Linkages should be provided from the business center to the neighborhoods, schools,
environmental districts, and parklands within the District along with Markley Lake and the
business park.
2. Development adjacent to the District's natural features and pedestrian access and trails should
include features that are sensitive and protective.
3. Dilapidated housing within the district should be targeted by a housing rehabilitation and
maintenance program.
4. Careful attention must be paid to creation of appropriate buffers between residential and non-
residential land uses and for land adjacent to County Roads and State Highway 13.
Comprehensive Plan ~2020
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5. The City well field should be improved through grading and seeding until the site is developed.
Existing buildings should be landscaped in order to provide a better transition with area and
adjacent neighborhoods.
6. No further development should occur in the industrial area north of County Road 21 until
public utilities are installed.
7. Replacement of non-conforming uses with permitted uses should be encouraged over time.
8. Future development adjacent to Markley Lake should provide public open space adjacent to the
lake.
9. County Road 21, at the City limits, should be designated as a location for a major community
entry feature.
10. The existing industrial park within this district should be upgraded to bring it into compliance
with the City's current Zoning Ordinance, and to provide sewer and water service to the
industrial park.
Oakwood:
This is a small fully developed Planning District. The neighborhood boundaries include
State Highway 13, County Road 44, and the City of Savage municipal limits. The 230 acres may
appear to be an even smaller area because so much of the land is consumed by school facilities
(Westwood Elementary School plus the Middle and Senior High Schools for District 719).
Gateway Shopping Center, an office cluster, financial institutions, and a fast food restaurant
are among the commercial uses.
The housing is comprised of suburban "rambler" style single family dwellings, developed at
approximately two units per acre although townhome and apartment units have been built adjoining
the business district.
Open space comprises approximately one third of the neighborhood. The School District
has recreation facilities that are available for community use when school is not in session.
Transportation needs are served by the adjoining arterial and collector streets plus Franklin
Trail that provides much used access to the business development oriented to State Highway 13.
DISTRICT OBJECTNES:
1. A trail system should be constructed with new development and redevelopment to link
residential neighborhoods to schools, Gateway Center and State Highway 13.
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2. Future redevelopment of the Gateway Center area should create an orientation to the adjacent
residential neighborhoods with sidewalks. Coordinated landscaping, and improved business
district identification should be priority items for future development efforts.
FrostlEastwood:
The 230 acre Frost/Eastwood Planning District is bounded on the west and north by the
lake of Prior Lake and the southeast by State Highway 13. It is fully developed with single family
housing averaging about two units per acre.
Public open space is provided at Green Oaks and Fish Point Parks; both are designed for
neighborhood use, one offers a softball playing field and the other a natural environment for passive
recreational use.
Access into the neighborhood is limited to State Highway 13 due to the lake configuration.
Links with other neighborhoods therefore are provided only by the lake. Fish Point Road and
150th Street together provide a loop street through this neighborhood which is the main link
between residents and the rest ofthe community.
DISTRICT OBJECTIVES:
1. A trail should be installed utilizing Fairlawn Shores Trail and 150th Street to link
neighborhoods with park facilities.
2. The City should evaluate alternatives to improve access to this Planning District from State
Highway 13.
Boudin/Oakland:
The boundaries of this Planning District include Prior Lake on the west, County Road 42 on
the north, and State Highway 13 on both the east and southeast. Because of the bay configuration
this Planning District is divided into roughly equal segments.
The north area includes a business center fronting on State Highway 13 which has office
space and which offers convenience goods for area residents. The business center is oriented
toward traffic from State Highway 13 and County Road 42.
The north half of the neighborhood includes a fully platted residential area containing
relatively small one-floor ramblers and a planned unit development which has mainly townhouses.
The south half of the Planning District is limited to single family housing and both sections were
developed at densities averaging less than two units per acre.
Boudins Park is in the north half and includes a softball field plus some recreation
equipment. The south half contains Oakland Beach Park which is largely wooded but also has
recreation equipment for children.
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-~-
Access to and from the Planning District is limited to State Highway 13 and to County
Road 42.
DISTRICT OBJECTIVES:
1. The electric transformer facility located on County Road 42 should be screened with an
adequate buffer for the adjacent business and residential areas.
2. The business center should be more accessible to the neighborhoods via pedestrian and bike
trails.
3. The City should acquire land near the intersection of State Highway 13 and County Road 42 for
the erection of a community entry monument.
4. The City should coordinate with the City of Savage to plan and develop roadway systems that
provide for the logical extension of streets such as Commerce Avenue, to the east.
Sand Point:
This planning District is in the extreme north of the developed area of the City and is
bordered on the north by County Road 42, on the south and east by Prior Lake and on the west by
North Shore Oaks Subdivision. The 240 acre district is largely developed.
Early development was characterized by lots platted along the lake front leaving relatively
large tracts which have no lake frontage. The Sand Point Planned Unit Development reversed this
trend, as the developer sold his lake frontage to the City and dedicated additional land for parks.
While earlier comprehensive plans have indicated some medium and high density
development along County Road 42, the demand for housing other than single family construction
here has been generally weak. Remaining undeveloped land contains steep slopes and is relatively
inaccessible; the average density ofthe neighborhood will be about two units per acre.
Access to the neighborhood will be enhanced when North Shore Planning District is
developed allowing the extension of Carriage Hill Road and Shore Trail west to County Road 21.
DISTRICT OBJECTIVES:
1. A trail system should be developed adjacent to County Road 42 and the extension of Carriage
Hill Parkway, to augment the existing trail system within the District.
2. Additional development adjacent to the wetland located north of Conroy's Bay must be
sensitive to the wetland environment.
North Shore:
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Comprehensive Plan ~2020
Chapter 1
This Planning District is southeast of the intersection of County Roads 21 and 42. The east
side was platted into a residential subdivision called North Shore Oaks which includes a
neighborhood park and lakeshore involving both a small lot subdivision platted many years ago and
some large tracts. There is an undivided lakeshore parcel which is wooded pastureland.
Access will be enhanced by the extension of Carriage Hill Parkway, Shore Trial and a
proposed north south neighborhood collector in the alignment of Pike Lake Trail. The District is
rich in environmental amenities and as such, trail systems, parks, and open space will be the
primary objective for development.
There are two prominent view areas that should be incorporated into the open space system
The areas are located in the quarter/quarter section west of North Shore Oaks 6th Addition and
along the western periphery of Pike Lake Trail near its intersection with Carriage Hill Parkway.
Future development adjacent to Carriage Hill Parkway will not be provided with direct
driveway access. Residential development next to that street and to County Roads 21 and 42
should provide adequate buffer areas consisting of large lot areas, setbacks and extensive berms
with landscaping.
This Planning District will accommodate single family residential development with limited
neighborhood and planned commercial areas and significant areas of business office development.
The commercial convenience centers should be designed to encourage pedestrian access rather than
sole orientation for automobile use.
DISTRICT OBJECTIVES:
1. Portions of the wooded undeveloped property located on the shore of Prior Lake should be
considered for a public facility and associated trail system to link the park with adjacent
neighborhoods.
2. The extension of Carriage Hill Parkway and Shore Trail are expected to provide the major
east/west traffic circulation for this District. Improvement of Shore Trail would provide the
best opportunity for a Lakeshore Drive with in the Community.
3. Roads should be designed to maximize the unique views and vistas of the Lake.
4. Future development will be carefully evaluated in terms of providing neighborhood
connections and internal circulation.
GrainwoodIMartinson:
This relatively small planning area contains some of the oldest residential development in
Prior Lake. Its boundaries on the east and south are the lake of Prior Lake, and County Road 21 is
the west limit. The north side is enclosed by a topographic break with ponding areas which follow
Raspberry Woods Park. This park is envisioned as one segment of a neighborhood trail that will
link all major public facilities on the north side of the lake.
Comprehensive Plan ~2020
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The early plats were developed at densities substantially higher than contemporary
development. Interior traffic circulation is poor. Access to the lake is confined to individual and
private association lots which front on the lake.
This Planning District is rich in history being the site of the original Grainwood Hotel. The
Wagon Bridge and railroad (generally along County Road 21) were predominant features.
Future redevelopment efforts should be concentrated to improve pedestrian and vehicular
traffic throughout the District. There are no park facilities, therefore, an effective link should be
provided to Waterfront Passage/Grainwood Crossings. The public park facility on the south shore
accompanied by a public marina would greatly enhance the public facilities available to this part of
the community.
DISTRICT OBJECTIVES:
1. The City should study and develop a series of historical markers or features within this District
to emphasize its rich heritage and incorporating elements of the Grainwood Hotel, Wagon
Bridge and railroad that were predominant features of the community's past.
2. Future redevelopment efforts should be concentrated to improve internal pedestrian and
vehicular circulation.
Island View/Nortbwood:
This Planning District fronts along the northwest side of upper Prior Lake and is bordered
on the north and east by County Roads 82 and 21 respectively. The western boundary includes a
small portion of Spring Lake Regional Park, the western corporate limits of Prior Lake, and a
combination of ridges and marshes that separate existing urban development from agricultural land
to the west.
This District was acquired through mid-1970's annexation and consolidation involving parts
of Spring Lake and Eagle Creek Townships. Much of the development within the Northwood
neighborhood was subdivided and built according to the standards of the township. Many
structures are "grandfathered" as non- conforming uses and are substandard in terms of their
setback dimensions.
Although this District contains considerable lake frontage, there are no public access points.
A recent channel excavation of Crystal Cove, financed by a neighborhood association, will ensure
lakeshore access for homes platted along the bay. Public access to Arctic Lake should be
considered when that area is urbanized.
Island View Park should be augmented with additional lands to the north and south, and to
be connected with the lake. There is a need for another neighborhood park in the southern portion
of the District to supplement Island View Park.
Comprehensive Plan ~2020
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The marina and limited medium density townhomes located on Grainwood Peninsula are an
important feature within this District. The peninsula is virtually separate from the rest of the
District.
This Planning District has a substantial expansion potential to the west which is limited
only by the extension of urban services.
Northwood Road, Fremont Avenue and County Road 82 serve as the transportation route
through this District. A trail and sidewalk should be provided along the entire length of North wood
Road in addition to the City-wide trail system that will link this District to Spring Lake Regional
Park and the Waterfront Passage area.
The City must carefully evaluate design options for Northwood Road in order to build a
facility that enhances the neighborhood. Many homes have direct access to Northwood Road
which is also the primary north/south connector street for the District. New development adjacent
to County Road 82 should feature mitigative measures such as berms, dense landscaping, and deep
lots with greater setbacks.
DISTRICT OBJECTNES:
1. Provide internal sidewalks and trails to link neighborhoods of this District to Spring Lake
Regional Park, County Road 82 and Waterfront Passage trail systems.
Provide public access to Arctic Lake with park land and extensive trails around the perimeter.
2. Augment Island View Park through the addition of park lands when adjacent properties
develop.
3. Provide a second neighborhood park in the southern portion of the District that is accessible to
residents of Spring Lake/ Willows as well as Island ViewINorthwood residents.
4. Improve Northwood Road, being sensitive to design and neighborhood concerns. A sidewalk
should be constructed along the entire length of Northwood Road to take advantage of lake
views and close proximity of Prior Lake.
5. Ensure that future development adjacent to County Road 82 incorporates mitigative measures
to decrease negative impacts of the County Road traffic on residential development.
Jeffers:
This Planning District is situated at the southwest corner of the intersection of County
Roads 42 and 21 and extends southward along the west side of County Road 21, to County Road
82.
The neighborhood contains natural features important to the identity of Prior Lake because
of the wooded ridge line that crosses the area in a northwest-to-southeast alignment. The ridge
Comprehensive Plan ~2020
Chapter 1
Page 24
includes the highest elevations in combination with the steepest slopes in the community and
should be preserved as a public open space. Studies of this area show that portions will be
extremely difficult to develop both because of the steep slopes and the ponding areas which are
protected lakes.
The southern area has not been studied as much, but it is separated by similar topographic
barriers from the land immediately to the west and is in close proximity to developing
neighborhoods north of the lakes.
The planning district totals 470 acres, but because of the natural features, it is likely a
significant portion will not be developed. Business office development is projected for the area
immediately adjacent to the intersection of County Roads 42 & 21.
DISTRICT OBJECTIVES:
1. An entry feature to identify the northern limits of Waterfront Passage should be located in this
District.
2. View corridors will be required adjacent to Waterfront Passage for public view of the protected
lakes, steep slopes, wetlands and wooded areas that are the predominant natural features within
this District.
3. The objective of any future development should be public access to the natural features in terms
of parks, trails, view platforms and other recreational and open space features.
4. A public trail system is proposed adjacent to County Roads 21 and 42 and adjacent to the ridge
line and ponding areas found within the District.
5. Minimal grading and tree removal should be allowed only if a developer demonstrates that the
environmentally sensitive areas will be protected.
6. The Prior Lake outlet channel traverses this District and should be protected from erosion and
encroachment of development.
7. Substantial public park facilities are planned for this District. All development proposals will
be closely scrutinized for compliance with the park and open space objectives of this
Comprehensive Plan.
8. The proximity of residential development to County Roads 21 and 42 will need substantial
buffers to protect the homes from negative traffic impacts.
Pike Lake:
The Pike Lake Planning District has gained some prominence with attention by various land
use and business development studies. It contains approximately 300 acres and is situated between
Pike Lake Trail and Crest Avenue on the north side of County Road 42. The land is farmed and is
Comprehensive Plan ~2020
Chapter 1
Page 25
currently enrolled in the Metropolitan Agricultural Preserve Program. The area IS readily
accessible to sanitary sewer and water trunk lines.
The north side water tower is south of County Road 42 immediately east of the site and the
Metropolitan Waste Control Commission interceptor is adjacent to the west boundary.
Land use and market feasibility studies indicate the Pike Lake area has development
advantages because it is the most northerly and easterly of the areas in Prior Lake that were
identified as being suitable for business development.
The land is well suited for this purpose since it is vacant, under one ownership, and with
future convenient access to the arterial road system.
DISTRICT OBJECTIVES:
1. The zoning shall remain agricultural for this District until it is included in the MUSA and urban
services are available.
2. Development should be oriented toward the community as well as to regional markets. Internal
pedestrian systems that link to adjacent neighborhoods would be paramount for all
development.
3. All future development shall be sensitive to the natural features within the District and provide
public view or trail access when appropriate.
4. The drainage area to Pike Lake located along the western periphery of the District shall be
protected from development encroachment and erosion.
5. Development proposals adjacent to County Roads 42 and 18 will need to incorporate
appropriate buffers to protect the development from negative impacts of traffic on these
thoroughfares. Buffers shall consist of appropriate landscaping, berms and open space
separation.
6. A community entry feature together with significant open space should be located near the
intersection of County Road 18 and the northern corporate limits.
The Wilds
The Wilds neighborhood is named for the large golf course subdivision of the same name
which makes up most of this area. The area is located south of County Road 42, east of County
Road 83 and north of County Road 82 and contains approximately 860 acres.
The remainder of this neighborhood is undeveloped and much of it is in agricultural use
as the entire area outside ofthe Wilds development is also outside the MUSA. The land use plan
for this neighborhood includes additional commercial development at the intersection of County
Comprehensive Plan ~2020
Chapter I
Page 26
Roads 42 and 83 while the rest of the undeveloped area is shown as low/medium density
residential.
DISTRICT OBJECTIVES:
1. Insure adequate trail and vehicular linkages to the rest of the City.
2. Provide for the extension of utilities on a timely basis.
3. Establish high development standards for the County Road 42 and 83 corridor.
Comprehensive Plan ~2020
Chapter 1
Page 27
-*"
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CHAPTER 3
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STAGING OF MUSA EXTENSIONS
Prior Lake is a developing community which is partially in the regional Rural Service Area
according to the September, 1994 Metropolitan Council's "Regional Blueprint." That contrasts
with the regional agency's earlier classification criteria which viewed the City as a freestanding
growth center in the midst of the Rural Service Area.
Close proximity and enhanced access to other developing communities in the Metropolitan
Urban Service Area (MUSA), make it clear the identification and establishment of the City as a
self-supporting commercial and service base City is an historical rather than futuristic vision.
The attributes which once supported the freestanding center status--state and county
transportation system access, lake-oriented public and private facilities and related amenities, a
defined town center, developed neighborhoods, and the supply of land--continue to be planning
assets. They will serve to form the City's response to regional planning policies which endorse the
concept of nurturing "life-cycle" communities which can provide housing and other opportunities
to residents of all ages and resources.
Growth has been and will continue to be predominately residential development which not
only impacts the physical resources and defines the character, but also directly contributes to the
population.
People, their homes, and the related infrastructure comprise the City's fundamental and
most valuable planning asset, its neighborhoods which are described in the Community Structure
portion of this Plan.
Population projections developed by the Metropolitan Council for the decades through
2000, 2010, and 2020 are shown in Table I which includes household, household size, and
employment data.
TABLE I
PRIOR LAKE POPULATION. HOUSEHOLDS. AND EMPLOYMENT
1980 - 2020
1980 1990 2000 2010 2020
POPULATION 7,284 11,482 16,034 21,000 28,445
HOUSEHOLDS 2,313 3,901 6,167 8,077 10,971
HOUSEHOLD SIZE 3.1 2.9 2.6 2.6 2.6
EMPLOYMENT 1,250 3,000 7,200 9,660 10,200
SOURCE: Metropolitan Council
Comprehensive Plan ~ 2020
Chapter 3
Page 124
The asset that supports the growth of course is land. The Metropolitan Council estimates of
population growth also consider the supply of land that is within the MUSA; the Metropolitan
Council data includes a factor of a five year overage or surplus to compensate for various market
fluctuations. This is significant to the City since the Metropolitan Council policies require the City
to demonstrate a need for urban land as a basic criterion for considering whether land in the Rural
Service Area should be reclassified and provided with urban services.
l'.. tetal of930 aeres is el:lITently ',aeam within the MUS.:\.. The City requested an additional
1,260 aeres to aeeemmodate estimated groVlth tbr-ough 2010 as shown on the attBehed map of the
Prepesed }.illSA E~{1'lansion .'\rea. The Metropolitan Coooeil, hO':lever, agreed to an additional
500 aeres withiR the 1illS.^.., based OR revised foreeasts for populatieR aBd hel:lseholds. The final
MUS}.. bOl:lfl:dary is sflO'.vn. on the attaehed Man-ieipal Urban Serviee Area map.
It is the City's pesition that the entire 1,260 Beres shotlld be added te the MUS.^.. as part of
the appr-o',al ef the Comprehensiye Plan. The primary reason for this is flmdbility in ae'lelopmElfit.
\Vhile there appears to be signifieant aereage within the 1illS.^.. at present, ml:leh ofthis is platted or
is held by Pr-ollerty e':,ners vlho haye indieated their laek of intent to de'/elep the property 8:H:)' time
iR the Rear futl:l:re. In additioR, of the 1,260 aeres proposed to be added, 320 aeres 8fe iR the
Agrieultl:lral Preserve program.. l'..pproximately 280 aeres of this land has beeR desigaated for
remeval fr-om the program, h\it the earliest this ean happen is 2001. Beeause this land has been
desiga.ated for high density residential and eemmereial 8:fI:d iRcRlstrial uses, the City is asking it be
allowed in the 1illS}.. expansion te permit detailed plar.ning for the deyelollment of the lll'Ollocty to
proeeed.
The Metropolitan Council Local Planning Handbook includes provisions for the City to
utilize the concept of an undesignated MUSA Reserve in place of the practice of drawing an actual
MUSA boundary on a map. The City of Prior Lake intends to utilize this method of designating the
MUSA within the City. The Handbook imposes the following conditions on the creation of an
undesignated MUSA Reserve:
1. The development at each stage will be built at or above the negotiated densities.
2. New development is contiguous to the current urban service area.
3. Development at each stage can be accommodated within the planned capacity of the
regional sewer system.
4. The local community adopts a premature subdivision ordinance.
5. Local infrastructure implications for all potentially designated areas have been
determined and candidate sites that fall outside the capability of the local community to
implement have been eliminated from consideration for development.
6. The local community development program provides the requisite local service and
infrastructure needs of the proposed development for each stage while preserving the
planned capacity and service level in the regional highway system.
7. Annual reporting of local use of the MUSA reserve and corresponding adiustments in
the CIP are required.
Comprehensive Plan ~ 2020
Chapter 3
Page 125
The City of Prior Lake has developed its' MUSA reserve by determining the approximate
acreage needed for residential development which meets the neg:otiated Livable Communities
standards for the Ci to the ear 2020. The acrea es were determined b a l' n ical densities
to the number of units of each type proiected to be completed during each 5 year period between
the present and 2020. Based on Metropolitan Council figures. there are 0.23 acres of non-
residential development for each 1.0 acres of residential development that occurs in Prior Lake.
Applying this factor against the estimated residential land demand of 1.397 acres adds an additional
417 acres of non-residential land for a total land demand of 1 814 acres. Based on land availabili
and current trends in commercial and industrial development in the area. the 417 acres of non-
residential land is allocated as follows: commercial. 120 acres: industrial. 210 acres: public and
recreational. 87 acres. Table II summarizes the land demand to 2020.
Comprehensive Plan ~ 2020
Chapter 3
Page 126
TABLE IT
PROJECTED DEVELOPMENT BY TYPE AND ESTIMATED LAND DEMAND
TIME FRAME NUMBER OF DWELLING UNITS ACREAGE
1999-2005 ... ... .... ...
... ... .. .....
SINGLE FAMILY 660 347
MEDIUM DENSITY 180 30
.
MULTIPLES 200 9
COMMERCIAL 30
INDUSTRIAL 40
PUBLIC 12
RECREATIONAL 12
SUBTOTAL 1,040 480
2005-2010 )..... ..... < .... ... .... ........< << <..... ......
.. ... ... .......
SINGLE F AMIL Y 600 316
MEDIUM DENSITY 210 35
MULTIPLES 300 14
COMMERCIAL 30
INDUSTRIAL 50
PUBLIC 10
RECREATIONAL 11
SUBTOTAL 1,110 466
2010-2015 ... ....... ... <. ....... ......
.... ...... . ..... ...
SINGLE F AMIL Y 500 263
MEDIUM DENSITY 310 52
MULTIPLES 400 18
COMMERCIAL 30
INDUSTRIAL 60
PUBLIC 10
RECREATIONAL 10
SUBTOTAL 1,210 443
2015-2020 .... .... ....
..... .... ... .....
SINGLE F AMIL Y 450 236
MEDIUM DENSITY 330 55
MULTIPLES 460 21
COMMERCIAL 30
INDUSTRIAL 60
PUBLIC 10
RECREATIONAL 12
SUBTOTAL 1,240 424
TOTALS 4,600 DWELLING UNITS 1,814 ACRES
Comprehensive Plan ~ 2020
Chapter 3
Page 127
The acreage figures shown in the table include the develooed lot areas plus local streets.
neighborhood parks and open space. Thev do not include wetlands. No acreage is shown for maior
roads or highways as the maior road system is in place and significant amounts of new right-of-way
are not contemplated. The overall residential density based on these figures is 3.3 dwelling units
per acre.
In order to insure that development which is proposed does not strain City resources. the
City will apply the following criteria in iudging whether a proposed development is eligible to have
sanitary sewer services extended.
. Property shall be contiguous to property already within the MUSA.
. MUSA designation shall only be given to developments having a recorded final plat and
a signed developers agreement with surety covering necessary infrastructure
improvements to be installed as Vart of the development.
. Where aoolicable. utility improvements will address health. safety and environmental
issues and concerns.
. The development will be consistent with the Comprehensive Plan.
. The development will provide adequate water supplies.
. The development will provide adequate roads and streets to serve the development.
. The development will provide for adequate sanitary sewer facilities.
. The development will proceed consistent with applicable environmental policies and
regulations.
. The developer and benefiting property owners shall assume the primary responsibility
for financing improvement costs. The City will participate in such financing only under
extraordinary circumstances.
. Preliminary plan approval shall not constitute a guarantee that a MUSA allocation will
be made to the subiect property.
. The development shall proceed under the understanding that the proiect will be
maintained in accordance with the limitations imposed by the City and the Metropolitan
Council regarding MUSA availability and potential sewage flows from the proiect. The
City and Metropolitan Council shall be indemnified by the developer against anv claims
arising as a result of future limitations on MUSA availability.
. The City agrees to annually report on all allocations of undesignated MUSA reserve to
the Metropolitan Council.
Figure 1 shows those areas in the City which have potential to be included in the MUSA
during the course of the next 20 years. The shaded areas shown have an area of approximately
2.100 acres.
Comprehensive Plan ~ 2020
Chapter 3
Page 128
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FIGURE 1
CITY OF PRIOR LAKE
BASE MAP
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The growth of neighboring communities, the completion and opening of the new bridge
over the Minnesota River at County Road 18 and State Highway 101, the connection of County
Road 21 with 1-35 east of the City, and the development of intense commercial and recreational
uses by the Mdewakanton Dakota Community will likely press development at a faster pace than
anticipated by the projections made earlier in the planning process. The Metropolitan Council
projections assumed residential development to proceed at a rate of 123 units per year. For the
above reasons, the City has assumed a higher rate of growth.
Constraints to development are both natural and man-made. Physical constraints include
topographical conditions, water bodies, soil conditions, and surface characteristics (wetlands, for
example). These are relatively easy to quantify and usually are thus deducted from the total
calculated amount ofland in the MUSA. "Developable land," therefore can be determined as a net
number of acres.
There are some man-made constraints to development which are due to external forces
beyond the City's effective control. Examples include the general economy and interest rates,
especially as they apply to construction; state laws and programs that may mandate certain limits on
development tools (tax increment financing, for example) and on the City's ability to generate
revenues for services through taxes; and regional policies regarding housing and the expansion of
theMUSA.
Other constraints include local policies that are defined by the City's vision for the future,
including the desire for a rate of development that may be lower than private interests would prefer.
Certain land uses may be preferred over others and this will be reflected in the City Plans and
regulations.
The development of the Mystic Lake complex can be viewed as an asset which provides
employment opportunities, recreation and hospitality facilities available to the community, and a
destination widely identified with the City). It can also be perceived as a constraint upon City
development as it represents competitive facilities that reduce opportunities for similar uses on
taxable real estate, traffic impact upon neighborhoods that would otherwise be controlled if the
destination uses and operations were under public jurisdiction, and regional agency agreements
with the Mdewakanton Dakota Community that provide sanitary sewer via lines through the Rural
Service Area despite regional policies that strive to retain the Rural Service Area notwithstanding
the desire oflandowners to also use the facilities.
The City's primary asset is its people and its continuing desire to plan for the future,
including redevelopment and preservation of areas that established the physical and social, and
political character of the community. This plan accounts for the various assets and constraints
through the various elements.
Comprehensive Plan ;w.w 2020
Chapter 3
Page 130
ORDERLY ANNEXATION
The City presently has an orderly annexation agreement with Spring Lake Township which
was entered into in 1972 and originally covered Sections 1,2,3,4,9, 10, 11, 12 and the east half of
Sections 5 and 8. Sections 1,2,3 and part of 10 and 11 have been incorporated into the City, so the
agreement now covers the remainder of the area.
The dates and timelines established in the original agreement have all lapsed or been
passed, and, as a result, the agreement is no longer an accurate guide to annexation activities nor
does it specify an effective process with which to deal with the variety of issues which must be
dealt with in an annexation proceeding.
The City's past experience with annexation has shown that it is very difficult to introduce
public improvements into areas currently served with septic tanks and wells. In addition,
resubdivision of the property is made more difficult because of improper home placement on large
lots and a general lack of consideration for future redevelopment options. In addition, there is
limited opportunity to obtain parks and open space, utility easements, street rights-of-way and trails
to link the area to the rest of the community.
Because the City has continued to receive inquiries every year regarding annexation, an
annexation policy was adopted in 1990 to guide the process. The procedure includes notification of
the Spring Lake Township Board and also contains several criteria which must be applied in
evaluating requests or annexation. These criteria are:
. Is the request consistent with the Comprehensive Plan?
. Is the stipulation form submitted by the applicant complete?
. Will extension of municipal services to the area raise taxes or fees City-wide? Is the
annexation of significant importance to justify such an increase?
. What is the impact on property owners in the annexed area?
. How much revenue will be generated form the annexed area and will this be sufficient
to offset the costs of annexation?
. What is the development status of the annexed area and what plans exist for
development?
. What effect will annexation have on development of property within the City near the
annexed area?
. How will the City benefit from the annexation?
While the policy raises a number of important issues to be considered in evaluating an
annexation proposal, it does not clearly indicate the City's position on these issues. Consequently,
it is somewhat difficult to evaluate a request. The following policies will address the issues raised
in the policy and assist in overall evaluation ofthe future annexation proposals.
Comprehensive Plan ~ 2020
Chapter 3
Page 131
1. Areas shall not be annexed to the City unless it can be demonstrated that the annexation
can be accomplished without cost to the residents of Prior Lake.
2. The annexation process shall include an determination of the appropriate land uses for
the annexed area and a subsequent Comprehensive Plan amendment.
3. The City should consider renegotiating the Orderly Annexation Agreement with Spring
Lake Township to reflect current thinking. This process should include a review of
lands currently covered by the agreement and a determination as to whether these lands
should remain within the annexation area.
Comprehensive Plan ~ 2020
Chapter 3
Page 132
CHAPTER 4 - TRANSPORTATION
TABLE OF CONTENTS
I. INTRODUCTION ... ............................................... ......... ........ .... ............. ..... ...... ..132
Study Objectives.............................................................................................. ...132
Background Information..................;................................................................. .133
II. ANALYSIS OF EXISTING AND FUTURE TRANSPORTATION
PROBLEMS...................................................... .................................................... .13 9
Existing Roadway System................................................................................ ..13 9
Programmed Improvements............................................................................... .139
Forecasts................................................................................ ........................... ..143
III. ROADWAY SYSTEM PLAN ..............................................................................146
Development of the Roadway Plan .................... .............................................. ..146
Guiding Planning Principals ............................................................ ...................146
Functional Classification System.......... ....... ....... ....... ......... .............................. .146
Recommendations..................................... ........................................................ ..150
IV. ANALYSIS OF CONSTRAINED CORRIDORS ..............................................153
v. TRAILS AND SIDEWALKS ...............................................................................158
VI. TRAN S IT PLAN ........... ........................... ......... ................................................... .15 9
Introduction........................................................................................................ .159
Transit Needs..................................................................................................... .159
Existing Transit System.............. .............. ......................................................... .159
Future Improvements.......................... ...................................... ........................ ..162
VII. AVIATION AND FREIGHT MOVEMENT ......................................................163
VII. RELATIONSHIP OF THE TRANSPORTATION PLAN TO THE
METRO PO LIT AN SYSTEM .................................... ....... .............................. .....164
VIII. PLAN IMPLEMENTATION ...............................................................................165
Transportation Plan Adoption...... ...... ................................................. ........... .....165
Initiate Jurisdictional Realignment Process............................. ........... .............. ..165
Protect Access........................................... ........................................................ ..165
Establish Improvement Programs....................... .............................................. ..166
Sources of Funding...................................... ...................................................... .166
Comprehensive Plan 20 I 0
Chapter 4
Page 131
CHAPTER 4
TRANSPORTATION
I. INTRODUCTION
PLAN OBJECTIVES
In general, the Transportation Plan demonstrates how the City of Prior Lake will provide
for an integrated transportation system that will adequately serve the needs of its residents and be
consistent with the metropolitan transportation system that lies within its boundaries. To
accomplish this objective, the Transportation Plan addresses the following issues:
1. How the density and distribution of land use at full development, and at various times in
the future, is related to:
. the proposed local transportation system, and
. the anticipated metropolitan transportation system
2. What the pattern and functional hierarchy of streets, and the location and design of access
points to the metropolitan highway system should be to:
. support the existing and proposed development of the area~
. provide a minor arterial and collector system that will serve both short trips and trips
to adjacent communities, and
. complement and support the metropolitan highway system
3. How the transportation plan should be implemented in order to:
. insure that the highest priority projects are constructed first,
. maintain a consistent and coherent roadway system during the evolution of the
roadway system, and
. provide for adequate funding for all proposed projects
4. What transit services and travel demand management strategies are appropriate for
implementation in Prior Lake in order to:
. increase the number and proportion of people who use transit or share rides, and
. reduce the peak level of demand on the entire transportation system
Because this analysis deals not only with streets and highways, but also with land use,
transit, traffic management and other topics, the results will constitute a Transportation Plan.
The plan will serve as the Transportation Element of the Comprehensive Plan.
Comprehensive Plan 20 I 0
Chapter 4
"Page 132
III *"
BACKGROUND INFORMATION
In order to accomplish these objectives, some assumptions were made regarding the
anticipated pattern and rate of development in the City of Prior Lake. The Prior Lake Land Use
Plan, the location of Prior Lake relative to defined urban growth boundaries, a prediction of the
pattern of development in the year 2020, and socioeconomic forecasts for the City were used to
help predict the future demand for transportation facilities and services. Figure 1 shows the
existing city boundary, existing street system and the location of the orderly annexation area.
The study area for this plan includes the area that may someday be incorporated into the City of
Prior Lake.
Land Use Plan
The Land Use Plan defines areas where the City will encourage specific types of land
uses to be developed. The general land use categories used by the city are:
. Residential- Rural Density (R-RD)
. Residential- Urban Low-to-Medium Density (R-L/MD)
. Residential- Urban High Density (R-HD)
. Retail Shopping - Neighborhood (C-NR)
. Retail Shopping - Community (C-CC)
. Recreation and Open Space
In addition, public areas are defined for schools, parks and other open spaces. Prior Lake
also defines environmentally sensitive areas such as lakes, wetlands, islands and steep slopes.
The Land Use Plan is a tool that the city uses to "guide" future development so that it is
consistent with other land uses in the City.
The Land Use Plan is an essential input into the transportation planning process because
it defines where people will need to travel and what neighborhoods need to be served.
The Land Use Plan also identifies physical constraints, both natural and man-made that
affect the options available for improving the transportation network.
Comprehensive Plan 2010
Chapter 4
Page 133
==
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I..ake
17
LEGEND
IIlM
l.aka
= = City Boundary
Shakopee
r:::=J Mdewakanton
Dakota
Commun~y
Regional Growth Areas
r:::=J Illustrative 2020 MUSA.
r:::=J Permanent Agricu~ural Area
D Permanent Rural Area
r:::=J Urban Area
D Urban Reserve
. The official 2020 MUSA ..ill b. determined by
IocoJ go.........."n end tile council os port of tile
1997-1998 Comprehensive Plcmo,g process.
. N
0.25 0;5 MIles A
Spring lAke
SRF,Inc.
0983223
City of Prior Lake Transportation Plan
March 1999
CITY OF PRIOR LAKE
FIGURE
1
Urban Services Area
Figure 1 also depicts several growth strategy policy areas as defined by the Metropolitan
Council. The purpose of these boundaries is to define the areas within the Twin Cities
Metropolitan area that are eligible for "urban services", specifically sewers, municipal water
systems and particular types of transportation systems. The boundary lines are defined and
maintained by the Metropolitan Council to assist in the orderly development of the metropolitan
area.
Most of Prior Lake falls within the Urban Area. This area is the portion of the region
actively becoming urbanized. Urban levels of transportation services are appropriate in the near
term in these areas, which includes built up areas and newly urbanizing areas.
The implication of this line is that those areas within Prior Lake that are within the line
will be developed soonest. The actual date that this development occurs is not prescribed. In
some cases the actual location of the line may be adjusted prior to the target year in response to
accelerated growth or changing conditions.
A portion of Prior Lake falls within the defined Illustrative 2020 MUSA. The MUSA,
or Metropolitan Urban Services Area, defines a longer-term boundary in which urban services
may be provided. The actual location of this line in Prior Lake will be determined as part of this
comprehensive planning process.
Prior Lake also includes areas included in the Urban Reserve. This area is considered a
transitional area, and serves as a reservoir of land needed to accommodate growth to the year
2040.
Outside of the urban reserve boundary are areas defined for rural uses, including permanent
agricultural areas and areas appropriate for rural density development. Urban development
patterns and services are discouraged in this area.
The location of the MUSA line is a valuable guide in determining the priority of roadway
improvements. The roadway system within this area is going to be in demand much sooner than
the roadway system outside of the line. This is one of the goals of having such a boundary; it
allows municipalities to focus limited resources on particular parts of their territory.
Socioeconomic Characteristics
For the purpose of this study, existing information on households, population and
employment was collected and supplemented with projections of these characteristics for the
year 2020. In order to understand the distribution of people and jobs, the City of Prior Lake was
divided into 18 Transportation Analysis Zones (TAZs). These are shown in Figure 2.
Comprehensive Plan 20 I 0
Chapter 4
Page 135
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LEGEND
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@ City Subzones
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SRF,Inc.
0983223
City of Prior Lake Transportation Plan
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FIGURE
2
March 1999
TRAFFIC ANANLYSIS ZONE (TAZ) BOUNDARIES
~
The cunent and projected households, population and employment for the City of Prior
Lake disaggregated into the 17 zones that are in the current municipal boundaries of the City is
shown in Table A-I in the Appendix. This information is based upon the location of existing
development, the Land Use Plan, and an understanding of the rate at which development is
occUlTing both within Prior Lake and throughout the region.
Table I is a comparison of 1980, 1990, 1997 and projected 2020 households, population
and employment for the City of Prior Lake. The number of households grew at an annual rate of
4.7 percent from 1980 to 1990. The forecast growth of households for the next 20 years is
equivalent to an annual growth rate of 3.8 percent, approximately what the increase has been
during the 1990s. The basis of estimating population is projecting the rate of construction of
housing units, and by inference the creation of households. An estimate of average household
size is used to calculate the forecast population. Household size in the City of Prior Lake
declined from 3.1 persons per household in 1980 to 2.9 persons per household in 1997. Future
population estimates are based on a household size of 2.5. The forecast of future employment
reflects a 2.0 percent annual increase between 1997 and 2020. The rapid employment growth
from 1990 to 1997 includes development of the Mystic Lake Casino and other enterprises of the
Shakopee Mdewakanton Sioux Community.
The socioeconomic information is used to develop traffic forecasts for the year 2020 to
allow an evaluation of the adequacy of the proposed roadway system. The specific methodology
utilized in the development of these traffic forecasts is described in Appendix (B).
Comprehensive Plan 2010
Chapter 4
Page 137
"' ,
TABLE 1. PAST AND PROJECTED GROWTH IN HOUSEHOLDS,
POPULATION AND EMPLOYMENT
Year Population Households Employment
1980 7,284 2,313 1,250
1990 11,482 3,901 3,000
1997 Estimated *
. City of Prior Lake 13,544 4,640 6,490
. Prior Lake plus 14,319 4,940 9,690
MDSC
2020*
-
. City of Prior Lake 27,400 11,000 10,200
. Prior Lake plus 28,950 11,600 14,725
MDSC
1980-1990
1990 -1997*
· City of Prior Lake
· Prior Lake plus
MDSC
1997 - 2020*
· City of Prior Lake
· Prior Lake plus
MDSC
Population ..
4.7%
PercentGrowthPerVear.
... ;Households:Employmefit .
5.4% 9.1%
2.4%
3.2%
3.4%
2.5%
11. 7%
18.2%
3.1%
3.1%
3.8%
3.8%
2.0%
1.8%
CO) The Shakopee Mdewakanton Sioux Community (MDSC) is a sovereign government. The
City of Prior Lake does not include households, population or employment on lands owned
by the MDSC, whereas the Metropolitan Council does. MDSC data are estimates, and are
included as part of the traffic forecasting process.
Comprehensive Plan 2010
Chapter 4
Page 138
II. ANALYSIS OF EXISTING AND FUTURE TRANSPORTATION
PROBLEMS
EXISTING ROADWAY SYSTEM
As with all municipalities, jurisdiction over the roadway system is shared among three
levels of government; the state, the county and the City. The Minnesota Department of
Transportation (MN/DOT), through its Metro District, maintains the trunk highway system on
behalf of the state and Scott County maintains the County State-Aid Highway (CSAH) and
County Road systems. The remaining streets and roadways are the responsibility of the City.
Traffic volumes at selected locations on the Prior Lake street system are shown in Figure
3. These values are obtained from traffic counts made by the Minnesota Department of
Transportation (MN/DOT), Scott County and the City of Prior Lake. Multi-lane roadways are
shown in Figure 4.
PROGRAMMED IMPROVEMENTS
Capacity improvements to state and county roads in the City of Prior Lake or the vicinity
are already programmed including the following:
TH 13--That portion ofTH 13 that extends from CSAH 44 to CSAH 42 in the City of Prior
Lake will be upgraded to improve capacity, operation and safety. The proposed design is a
"two-lane divided" with left and right turn lanes at access points. The City of Prior Lake has
signed an agreement with MN/DOT on appropriate intersection geometrics. Funding has
been approved for improvements at CSAH 12 (Spring Lake Rd.) and for traffic signal
coordination/interconnection from Fish Point Road to CSAH 44.
CSAH 42--This roadway is currently four-lane from Ferndale Avenue to TH 13. An
upgrade to four-lane divided from CSAH 17 in Shakopee to Ferndale Avenue is
programmed for 1999, which will establish a continuous four-lane divided facility from
CSAH 17 to the City of Apple Valley.
Improvements to roadways outside of the City of Prior Lake over the next few years will
also have major impacts on circulation between Prior Lake and adjacent municipalities:
CSAH 21--A new roadway is programmed for construction in 2001-2002 north of Prior
Lake connecting CSAH 18 and CSAH 16. It will ultimately connect to existing CSAH 21 at
CSAH 42.
Comprehensive Plan 20 I 0
Chapter 4
Page 139
CSAH 27--The existing roadway between County Road 68 and CSAH 44 will be
reconstructed as a four-lane divided arterial. This project is in the Scott County program.
County Road 87--This roadway will be re-graded and paved from CSAH 21 to County
Road 68.
County Road 83-- The Shakopee Mdewakanton Dakota Community has explored the
possibility of financing the upgrade of County Road 83 from CSAH 42 to County Road 82
to four-lane divided. Although a preliminary design has been completed, no further work is
planned at this time.
Two new segments of the City's collector system are currently programmed during the next
four years:
Carriage Hills Parkway, from Bluebird Trail to Pine Hill Trail (2002), which will provide a
collector connection paralleling CSH 42 in that area.
"Ring Road" Concept Extension - This project consists of an additional street segment
south of Franklin Trail that will provide safer and improved access to TH 13 from adjacent
properties. Portions of this concept already exist.
These projects are base on the 1999-2003 Capital Improvements Program for the City of
Prior Lake and 1998-2002 Capital Improvements Program for Scott County. Scott County's
1999-2003 CIP was in the process of review as of January 1999.
Comprehensive Plan 2010
Chapter 4
Page 140
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City of Prior Lake Transportation Plan
March 1999
Multi-Lane Roadways in the City of Prior Lake
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FIGURE
4
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FORECASTS
Daily traffic forecasts for the year 2020 were made to detelmine the adequacy and
appropriateness of the street and highway system to accommodate the anticipated level of
development. Figure 5 depicts the anticipated volume of traffic for the year 2020. Figure 6
illustrates those roadways that are expected to be congested, a level of service "E" of "F", if no
improvements are made to the roadway system beyond those already in place or programmed for
improvement (no improvements to TH 13 are included). The "existing and programmed"
roadway system is used as a basis for comparison because it assumes projects already planned
and budgeted for will be completed but no additional projects will be added before the forecast
year.
The proposed roadway system described in the next section includes roadways and
capacity improvements that do not currently exist or are not in the current CIP. The proposed
transportation system is designed to alleviate congestion on all roadways in the City of Prior
Lake.
Comprehensive Plan 2010
Chapter 4
Page 143
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City of Prior Lake Transportation Plan
YEAR 2020 DAILY TRAFFIC FORECASTS ON
PROPOSED ROADWAY SYSTEM
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City of Prior Lake Transportation Plan
CONGESTION ON EXISTING AND PROGRAMMED
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March 1999
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FIGURE
6
III. ROADWAY SYSTEM PLAN
The proposed Roadway Plan and Functional Classification System are shown in Figure 7.
A brief description of each classification, its compatibility with regional and county functions
and changes with respect to the current adopted plan is provided next.
DEVELOPMENT OF THE ROADWAY PLAN
The Metropolitan Council requires that local comprehensive plans be consistent with the
regional Transportation Development Guide/Policy Plan. This includes recognizing the inter-
relationship between land use and transportation facilities. The Transportation Plan is that
element of the Comprehensive Plan of the City of Prior Lake which insures that land use type
and intensity is compatible with the proposed transportation system.
GUIDING PLANNING PRINCIPLES
The City developed the Prior Lake Thoroughfare Plan using the following guidelines or
planning principles:
I. The functional classification of the roadway system in Prior Lake should conform to
the criteria and characteristics summarized in Appendix C.
2. The plan should reflect vehicular travel demand at full development.
3. The full development level, as defined by the proposed Land Use Guide Plan, should
incorporate the limiting effects that the identified physical constraints have on the
attainment of the anticipated level of development.
4. Compatibility should be maintained between the roadway system in Prior Lake and
county and regional roadway systems.
5. In developing the plan, roadway segments and intersections that cannot accommodate
the anticipated vehicular travel demand should be identified.
FUNCTIONAL CLASSIFICATION SYSTEM
In the City of Prior Lake, the proposed functional classification system is as follows:
· Principal Arterials
· Minor Arterials
· "A" Minor Arterials
· "B" Minor Arterials
· Major Collector Streets
· Minor Collector Streets
· Local Streets
Comprehensive Plan 20 I 0
Chapter 4
Page 146
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City of Prior Lake Transportation Plan
PROPOSED FUNCTIONAL CLASSIFICATION SYSTEM
FIGURE
7
March 1999
Principal Arterials
Principal arterials are considered part of the metropolitan highway system. Their
function is to connect the metropolitan region with important locations outside of the region and
to interconnect the Central Business Districts (CBD's) and regional business concentrations
(RBC's). These roadways are designed for high-speed movement with high capacity and an
emphasis on serving long trips. They are spaced from three to six miles in the developing area.
Two roadways in the City of Prior Lake are proposed to be principal arterials. These are:
1. CSAH 42--From CSAH 21 to the east.
2. CSAH 21--From CSAH 42 to the north.
In this plan, CSAH 42 is the primary connection between northeastern Scott County and
the Burnsville Center RBC. The principal arterial designation extends as far west as the
intersection with CSAH 21. From this point northward, CSAH 21 is also designated as a
principal arterial. This roadway will provide the most direct connection to the new Bloomington
Ferry Bridge, and hence the entire metropolitan highway system, from the City of Prior Lake.
The proposed designation of these roadways as principal arterials is generally consistent
with the Scott County Transportation Plan and Metropolitan Council. This configuration
represents the ultimate designation of the principal arterial. System. Currently, the principal
arterial designation of CSAH 42 ends at CSAH 18, and CSAH 18 is designated as the principal
arterial connection between CSAH 42 and TH I 69/Bloomington Ferry Bridge.
Minor Arterials
Minor arterials are also designed to emphasize mobility over land access, serving to
connect cities with adjacent communities and the metropolitan highway system. Major business
concentrations and other important traffic generators are located on minor arterials. In the
developing area, one to two mile spacing is considered sufficient.
Minor arterials are organized into two groups: I) "A" Minor Arterials and 2) "B" Minor
Arterials. "A" Minor Arterials are part of a region-wide system of roadways designated by the
Metropolitan Council. This system functions in support of the metropolitan highway system by
providing inter-community connections and alternative routes in congested corridors. They are
further subdivided into the type of minor arterial function they provide. Two type of "A" minor
arterials are found: "connector" and "expander". Connector arterials are found in and near the
rural areas, providing good, safe connections among communities in areas where no principal
arterials exist. Expander arterials connect developing urban areas outside of the 1-494/694
beltway, serving medium-to-Iong circumferential suburb-to-suburb trips.
Comprehensive Plan 20 I 0
Chapter 4
Page 148
Minor arterials in the City of Prior Lake can be organized into the following major routes:
. "A" Minor Arterials
. TH 13--From the north city limits to the south city limits. ("A" Minor Connector
south ofCSAH 21, "A" Minor Expander north ofCSAH 21)
. CSAH 21--From the southeast corner of the City to CSAH 42. ("A" Minor
Connector)
. CSAH 42--From CSAH 21 to the west. ("A" Minor Expander)
. County Road 17--Along the western margin ofthe City. ("A" Minor Connector)
. CSAH 18- To the north.
. "B" Minor Arterials
. County Road 23--To the south.
. County Road 12--To the west.
. County Road 82--From County Road 21 to County Road 17.
. County Road 83--From CSAH 42 to County Road 82.
The classification of these minor arterials is consistent with the Scott county Transportation
Plan Metropolitan Council except for the proposed future designation of CSAH 18 as a minor
arterial north of CSAH 42 once CSAH 21 is constructed as a principal arterial.
Collectors
A system of major and minor collectors is suggested that would serve to connect individual
neighborhoods to the minor arterial system. In general, allowing for physical constraints, the
principal and minor arterials form a grid system within the City. Each neighborhood thus
defined is served by at least one collector. The designation of collector streets is intended to
focus traffic entering or leaving the neighborhoods onto particular access points on the arterial
system, and thereby promoting greater efficiency on the higher capacity roadways.
The location of future minor collectors is subject to change during the engineering process.
The location shown in Figure 7 is intended to show the general alignment and the points to be
connected.
Local Streets
Local streets are all those that are not classified as arterial or collector. These streets are for
access to adjacent property and designed as low speed, low capacity facilities. Long distance
travel is purposefully directed away from these streets to the collector and arterial system. Local
streets primarily serve residential areas.
Comprehensive Plan 2010
Chapter 4
Page 149
RECOMMENDA TIONS
In order to create the proposed roadway system out of the existing system, the City will
have to encourage a series of capacity improvement projects between now and the year 2020.
Figure 8 illustrates the cross-section recommended to be in place by the year 2020 for roadways
in the City of Prior Lake. Many of these projects are on state or county highways and therefore
not under the complete control of the City. Nevertheless, by identifying these projects, the City
is establishing its position in regards to improvements on these roadways.
The following is a list of recommended projects by functional classification:
I. PRINCIPAL ARTERIAL
A. Construct new four-lane divided roadway
1. CSAH 21--construct a new four-lane roadway as an extension of existing
CSAH 21 to connect to the Shakopee Bypass and the new Bloomington Ferry
Bridge (TH 169). Scott County has programmed the portion of this roadway
from CSAH 16 to the north for 2001-2002.
II. MINOR ARTERIALS
A. Upgrade to four-lane divided roadway
1. TH 13-- This roadway should be improved and access restricted to select
intersections from CSAH 42 to County Road 81 as agreed upon by the City,
Scott County and MN/DOT.
2. County Road 83-- This roadway has rapidly increased in traffic since the
construction of the Mystic Lake Casino. Reconstruction to four-lane divided
is recommended in the near-term.
B. Upgrade to four-lane undivided roadway
I. County Road 82--From County Road 21 to County Road 17.
2.
III. COLLECTORS
A. Construct new two-lane divided parkway
I. Fish Point Road--Complete a continuous roadway from County Road 21 to
County Road 44.
2. Carriage Hills Parkway--Complete a continuous roadway from County Road
21 to Femdale Avenue, programmed for construction in 2002.
Comprehensive Plan 20 I 0
Chapter 4
Page 150
B. Construct new two-lane undivided roadway
I. From Pike Lake Trail to Boone Avenue, north of and parallel to CSAH 42.
2. Extend PriOl"Wood Street from Five Hawks Avenue to Duluth Avenue.
C. Upgrade existing two-lane roadway
1. Pike Lake Trail--From CSAH 42 to north city limits.
2. Northwood Road--From County Road 12 to South of Arctic Circle.
Comprehensive Plan 2010
Chapter 4
Page 15 I
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SRF,Inc.
0983223
City of Prior Lake Transportation Plan
RECOMMENDED ROADWAY LANE
CONFIGURA TION YEAR 2020
March 1999
8
)
IV. ANALYSIS OF CONSTRAINED CORRIDORS
Figure 8 identifies the most desirable roadway system for the City of Prior Lake for the
year 2020. However, there are physical, operational and political constraints to the
implementation of the desirable set of improvements in the following con"idors:
. TH 13--from CSAH 17 to CSAH 42
. CSAH 12--from Howard Lake Road to TH 13
. CSAH 21--from County Road 82 to West Avenue
. CSAH 42 - from CSAH 83 to TH 13
TH13
TH 13 through the City of Prior Lake serves a dual function of providing intra-
community circulation for the City as well as regional access for people traveling between
southern Scott County and the metropolitan area. Because of the three major lakes around which
the City has developed (Spring Lake, Upper Prior Lake and Lower Prior Lake), TH 13 is the only
continuous roadway in the City that trends north to south. Topography and existing development
preclude the establishment of a parallel facility.
In 1998 the City of Prior Lake approved along-term access and development plan for
TH 13c through the City. The plan was the result of a joint effort of Prior Lake, Savage,
MN/DOT and Scott County. Need for the plan arose because of funding and physical constraints
that limit the ability to correct traffic problems in the corridor.
The plan is part of a three-track approach the City of Prior Lake will advocate to allow
TH 13 to operate at acceptable levels of service:
1) establish an alternate route for portions of the regional traffic,
2) pursue the upgrade of TH 13 to enhance its traffic flow; and
3) establish "back street" connections wherever possible.
Establish Alternate Route for Regional Traffic
Currently, regional traffic from southern Scott County and beyond use TH 13 to reach the
metropolitan area. The roadway's status as a state highway, its continuity and the amount of
time it has been in place all contribute to the roadway's role as a through route for non-Prior
Lake residents.
Two routes exist to redirect some regional trips away from TH 13: CSAH 17 and
CSAH 27. CSAH 17 has an interchange with TH 169 that will provide the most direct route
between the existing TH 13/TH 282/CSAH 17 junction and the metropolitan area. On a daily
basis, it is estimated that 4,000 to 7,000 trips could be diverted away from TH 13 through
Prior Lake. The second route option is the future upgrade of CSAH 27 to the east of Prior Lake.
Although a direct north-south connection of CSAH 27 to TH 13 is no longer being considered
Comprehensive Plan 2010
Chapter 4
Page 153
(due to environmental constraints) the proposed capacity expansion and realignment will provide
a good, safe route for traffic from south of Prior Lake.
The diversion of traffic from TH 13 can be promoted through the following actions:
· Upgrade CSAH 17 to a four-lane facility, north ofTH 13, preferably within 10 years.
· Complete the upgrade CSAH 27 to a four-lane facility, east and north of Prior Lake,
preferably within 10 years.
· Sign CSAH 17 to direct traffic to CSAH 42 and to the Shakopee Bypass.
· Sign CSAH 27 to direct traffic to CSAH 42 and to TH 13.
CSAH 17 would be a continuous north-south route through the county, with an
interchange with the Shakopee Bypass. Trips using CSAH 17 would also avoid the Prior Lake
commercial area. The corridor through which CSAH 17 passes is generally undeveloped and,
with the proper planning, can be preserved until upgrade of the roadway is required. Current
Scott County policy already encourages the protection of access onto county roads but special
consideration should be given to the possibility of CSAH 17 evolving into a limited access
expressway.
Upgrade TH 13
Figure 9 shows the configuration of TH 13 through Prior Lake as recommended the
multi-agency task force and approved by the City of Prior Lake. These improvements are
scheduled to occur over a 30-year time horizon, largely dependent on local development, traffic
growth and accident patterns as well as funding availability. Funding has been included in the
1999-2002 regional Capital Improvements Program for improvements at CSAH 12 (Spring Lake
Rd.) and for traffic signal coordination/interconnection from Fish Point Road to CSAH 44.
What is important is that traffic be allowed to move through the area as efficiently as
possible, minimizing vehicle conflicts that lead to congestion. On the other hand, the proposed
signal spacing and highway design will result in speeds that are noticeably lower than with a
four-lane divided expressway suggested for CSAH 17, further encouraging the diversion of
regional trips from TH 13.
The use of a parkway design for TH 13 would create an attractive "signature" roadway
for Prior Lake by making judicious use of physical design elements.
Establish Side Street Connections
Wherever possible, the City should establish parallel side street connections that provide
motorists with the chance to avoid using TH 13 for short trips or for access to businesses along
TH 13. The extension of Toronto Avenue to Franklin Trail is an example of the application of
this principle. There are many places where existing development, especially in residential areas,
makes the establishment of a parallel roadway impossible. However, redevelopment of
Comprehensive Plan 20 I 0
Chapter 4
Page 154
properties along TH 13 may create opportunities that cannot be foreseen now. The City should
remain alert to any possibility of creating a frontage road and/or a continuous route one or two
blocks away from TH 13. The timing of access restrictions at TH 13 and Anna Trail has been
tied to the completion of the "Ring Road" in that area.
CSAH 21
CSAH 21 is one of two east-west roadways that cross the chain of lakes around which
Prior Lake has developed. The roadway spans a navigable channel that allows boats to cross
between Upper Prior Lake and Lower Prior Lake. A four-lane bridge that incorporates
architectural enhancements was recently constructed at this location.
The existing roadway is four-lane undivided from County Road 82 to TH 13. When this
project was undertaken, it required the construction of several retaining walls and the acceptance
of tight curvature to fit the roadway into the available right-of-way. Any further upgrade of the
roadway to even a five-lane section would require the acquisition of a significant number of
residential properties. This is not recommended.
Given the limitations of the right-of-way and the consequent impracticality of upgrading
the roadway, access to this section of CSAH 21 is expected to operate at low levels of service
during the peak hour in the year 2020 (Figure 6). Placement of traffic signals at Duluth Avenue,
W est Avenue and County Road 82 should provide sufficient gaps in the traffic stream to allow
access from the other streets and driveways.
CSAH 12
CSAH 12, from TH 13 to CSAH 17, is one of two connections between the east and west
sides of the City. Currently, this is a low volume roadway; but, as the City continues to urbanize,
especially in the southern part of the incorporated area, traffic is expected to increase.
West of County Road 81, there is not sufficient room between the residential properties
and CSAH 12 to allow acquisition of sufficient right-of-way to construct a four-lane roadway.
This is particularly the case west of Northwood Road where the houses on the south side of the
road are on the lakeshore and the houses on the north are adjacent to a wetland.
Any upgrade of CSAH 12 in the City of Prior Lake needs to accommodate the existing
residences as well as the unique topography. When these factors are taken into consideration, it
is clear that capacity movements to this roadway are undesirable.
CSAH 42
A multi-agency CSAH 42 Study is nearing completion. Prior Lake and other cities
located adjacent to CSAH 42, the counties of, Dakota and Scott, Minnesota Valley Transit
Authority, MnlDOT and the Metropolitan Council are represented on the study. This study is
addressing land use and traffic issues along the entire length of CSAH 42 in Dakota and Scott
Comprehensive Plan 2010
Chapter 4
Page 155
Counties to determine the extent to which CSAH 42 can serve as a principal arterial on the
regional highway system.
Issues that will affect the City of Prior Lake include:
· Full-access signalized intersection spacing -- An average spacing of one-half mile or more
between traffic signals permits the roadway to operate within the acceptable average speed
desired of a principal arterial (above 40 MPH). Signalization should be planned accordingly.
· Topography -- Physical constraints on land adjacent to Prior Lake will preclude spacing at
exactly one-half mile intervals. As land is subdivided for development or redevelopment the
City will need to work with Scott County to ensure a logical location for access.
· Partial Access Intersection Spacing - Other intersections may have less than full access,
including one-half (right turn in, right turn out) and three-quarter (right-in, right-out and left-
in). These intersections should be spaced at 1/4th and 1/8th-mile intervals on average.
The purpose of providing controlled access is to permit development of land along CSAH 42
without adversely affecting traffic operations. The collector roadway system will provide a
supplementary means of access to the extent that alternative points of access to land uses can be
achieved.
Comprehensive Plan 2010
Chapter 4
Page 156
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This subject will be discussed in greater detail in Chapter 5.
Comprehensive Plan 2010
Chapter 4
Page 158
VI. TRANSIT PLAN
INTRODUCTION
In keeping with the limited availability of transit service, the number of Prior Lake
residents using transit is modest, although stable. Continued population growth in Prior Lake,
severe congestion in the 1-35W corridor and transit services improvements will likely increase
transit ridership. Human service needs include transportation, which are met by a variety of
transit options.
The City supports the continued development of appropriate transit services in the area in
coordination with the Metropolitan Council Transportation Division, the Minnesota Valley
Transit Authority and other transit providers. The City will work with these and other
organizations and individuals to identify the demand for public transit and to design new services
and facilities. Well-utilized transit services can contribute to congestion relief on major
roadways in the community while providing important mobility for certain residents.
TRANSIT NEEDS
The 1996 Metropolitan Council's Transportation Development Guide ChapterlPolicy
Plan (1996) identifies Prior Lake as generally lying in the "outer suburban" transit zone. The
following services are most appropriate in that area:
. Peak period express bus service
· Ridesharing
. Local circulation provided with small vehicles or dial-a-ride type vehicles
EXISTING TRANSIT SYSTEM
Regular Route Transit Service
Located within the Metropolitan Council metropolitan transit taxing district, City
residents are taxed for regional transit service through the property tax levy. Effective in 1990,
the City of Prior Lake "opted-out" of the regular metropolitan transit system and, along with
other nearby communities, established locally designed transit services. The intent was to
increase the level of service and to develop new services that were tailored to local needs.
The opt-out cities of Apple Valley, Burnsville, Eagan, Rosemount, Prior Lake and
Savage joined together to create the Minnesota Valley Transit Authority (MVTA). The MVTA
Board of Commissioners includes representatives from each of the cities along with
representatives from Dakota and Scott Counties. An Executive Director administers contracts
for services with bus operators, develops funding agreements with the Metropolitan Council,
conducts marketing programs, monitors existing transit services and develops new transit
serVIces.
Comprehensive Plan 2010
Chapter 4
Page 159
As show in Figure 10, Prior Lake is served directly by Route 35R operating from Prior
Lake to the Milmeapolis CBD. Two a.m. and two p.m. limited stop trips operate via TH 13.
Park-and-ride lots are located at TH 13 and Toronto Avenue (Priordale Mall) and TH 13 and
CSAH 21. The fare for this route is $2.00 per ride.
The park-and-ride lots are currently operating less than full. Ten-to-twelve vehicles
typically use the 25 spaces available at Priordale Mall. The TH 13/CSAH 21 lot typically has 8-
10 vehicles out of the 15 available.
Route 423 provides demand responsive (dial-a-ride) service to the Savage/Prior Lake area
in the summer months, serving to help meet the mobility needs of area residents. Service is
available to Valleyfair amusement park and to BurnsviIIe Center. The BurnsviIIe Center
connection provides opportunities to transfer to other routes in the regional transit system.
Typical fare is $1.50 per ride, with seniors riding for $1.00 and children under 5 generally riding
free.
Ridesharing
Prior Lake residents and those employed in Prior Lake are eligible to participate in the
Metro Commuter Services ridesharing match program. In addition, MVT A works with Vanpool
services, Inc. organize vanpools to work locations throughout the region.
Human Services Transportation
The Scott County Department of Human Services operates a transportation program for
the transit dependent population. While this population group is relatively small within the City,
for those individuals the County transportation services are frequently essential for access to
medical care and necessary personal errands (grocery store, bank, library). County-wide the
system carries about 50,000 riders per year. Funding sources include Scott County, the
Metropolitan Council, MN/DOT (which disperses state and some federal funds) and fares.
The County weekday services include flexible fixed routes, dial-a-ride and volunteer
drivers. Fixed routes include transportation of the developmentally disabled to the Development
Achievement Center (DAC) and Opportunity Workshop as well as 30 other work training and
work sites, adult day care and social worker referrals. Other fixed routes include one day per
week group shopping trips within individual communities and one day per month group trips
from communities to regional shopping centers. The volunteer driver component uses 25 drivers
and their autos
The dial-a-ride service is used mainly for medical appointments. It also helps to bring
people to congregate dining sites. Frequent destinations include the University of Minnesota
Hospital and Clinic, the Fairview Southdale and Fairview Ridges hospitals, and the Veterans
Administration hospital.
Comprehensive Plan 2010
Chapter 4
Page 160
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The Human Services Department owns and operates ten lift-equipped buses. Fares are
based on a $0.25 local zone, with distance-based increments to $6.00 round trip to the Metro
area. Fares within the local community are kept at a minimum as those who utilize the service
for local shopping day are primarily elderly residents on a fixed income.
FUTURE IMPROVEMENTS
In general, the existing transit service in Prior Lake is appropriate for the location and
density of the City. Short-term improvements may be implemented that consist of route
realignments, schedule adjustments, facility improvements and aggressive local marketing of
service. More significant changes will continue to be studied and implemented provided funding
becomes available. This could include reverse-commute service as the City's employment base
grows.
Future areas of development in Prior Lake include a business park along County Road 21
and Fish Point Road, a corporate office along County Road 21 and County Road 42, and a
commercial development along County Road 42 and County Road 18. Transit service
connecting these activity centers may be warranted.
Comprehensive Plan 2010
Chapter 4
Page 162
VII. AVIATION AND FREIGHT MOVEMENT
AVIATION
Prior Lake is located approximately 15 miles southwest of MSP International AirpOli. It
is also located approximately seven miles south of Flying Cloud Airport in Eden Prairie and
about 12 miles northwest of Airlake Airport in Lakeville, two minor reliever airports in the
regional airport system as classified by the Metropolitan Council' s Aviation Development
Guide/Policy Plan.
Prior Lake is located outside of the defined airport influence area for each of these
airports. There are no structures within Prior Lake that exceed 500 feet in height. Any applicant
who proposes to construct a structure 200 feet above the ground that could affect navigable
airspace level must get appropriate approval. The Federal Aviation Administration and the
Minnesota Department of Transportation must be notified at least 30 days in advance of
construction, as required by law (see MCAR 8800.1200 Subpart 3 and FAA Form 7460-8).
Mn/DOT designates several lakes in Scott County as permitted for seaplane use under
aeronautics rules and regulations:
. Cedar
. Geis
. Pleasant
. Prior-East
. Prior- West
. Spring
Prior Lake is located within the City of Prior Lake and Spring Lake lies adjacent to the
City. The City is responsible for adopting any safety or land use ordinances that affect seaplane
operation, but has none at this point in time.
FREIGHT MOVEMENT
No rail, waterway or major trucking activity occurs within the City of Prior Lake. Truck
through-traffic can be expected on the principal arterials (TH 13 and CSAH 42) and, to a lesser
extent on the minor arterial system.
No significant commercial activity exists away from TH 13 or CSAH 42 except for the
business enterprises of the Mdewakanton Sioux Community along CSAH 83 (a minor arterial).
Locating industrial and commercial land uses with good access to the principal arterial system
will reduce the potential effect of truck traffic on residential areas.
Comprehensive Plan 2010
Chapter 4
Page 163
VIII. RELATIONSHIP OF THE TRANSPORTATION PLAN TO THE
METROPOLITAN SYSTEM
The Metropolitan Council is the agency responsible for long range transpOliation
planning in the Twin Cities Metropolitan area. The "Transportation Development Guide/Policy
Plan", published in 1996, outlines the transportation policies and plans that support the
Metropolitan Council's "Regional Blueprint". Transportation plans adopted by individual cities
need to be consistent with the policies and plans outlined by the Metropolitan Council.
To ensure this consistency, the City of Prior Lake has undertaken a comprehensive
approach for dealing with transportation issues. This approach considers the following methods
for dealing with current and future problems: (1) an updated Thoroughfare Plan, (2) support of
regional programs and activities, and (3) coordination with other governmental agencies. The
City's approach to each of these is described below:
· The City will adopt a new Thoroughfare element of the City's Transportation Plan
that recognizes the need to support the metropolitan highway system. The major
elements of the new thoroughfare plan are:
* An arterial and collector system spaced in accordance with Metropolitan Council
guidelines contained in the Transportation Development Guide/Policy Plan.
* An arterial system that provides both east-west and north-south continuity
between the City of Prior Lake and adjacent communities, thus providing
alternatives to the metropolitan system for medium- and long-distance inter-
community trips.
* A system of collectors which focuses traffic entering or leaving neighborhoods
and commercial districts onto a limited number of access points on the arterial
system. This supports the need to maintain a high degree of mobility on arterials
while providing most efficient access to local streets.
* The City supports regional programs, and activities designed to improve mobility
on both the highway and transit system. This includes the improvement of
capacity on 1-35W from downtown Minneapolis to Burnsville, including
enhanced transit service where appropriate.
· The City recognizes the need to coordinate its efforts to resolve transportation issues
with those of adjacent communities, Scott County, the Minnesota Department of
Transportation and the Metropolitan COlmcil.
Comprehensive Plan 2010
Chapter 4
Page 164
IX. PLAN IMPLEMENTATION
Previous sections have examined future travel demand, have suggested guidelines for
developing a Transportation Plan, and have recommended a Plan that is responsive to these
considerations. This section concentrates on examining the steps necessary to implement the
Transportation Plan. It discusses a general strategy for moving from 1995 to the future in
accomplishing the plan.
TRANSPORTATION PLAN ADOPTION
Once the City Council has adopted the Transportation Plan, it establishes the guidelines
by which decisions regarding transportation facilities will be made in Prior Lake. The City
should periodically review the assumptions under which the plan was developed, including
estimates of future development, population trends, changing financial resources, energy
considerations, and citizen and governmental input, and update the plan accordingly.
The plan should be circulated widely so that residents and the business community are
aware of the opportunities and limitations that the plan provides, thus enabling all interested
parties to plan with full knowledge.
INITIATE JURISDICTIONAL REALIGNMENT PROCESS
In general, it is good policy that Scott County and the State (MN/DOT) assume
responsibility for the arterial system, and that Prior Lake assume responsibility for the collector
and local street systems. This is, to a large extent, the situation in Prior Lake.
Roadways shown in the Scott County Transportation Plan as candidates for turnback
include the following:
. CSAH 39
. County Road 81 - from TH 13 to CSAH 12
. I 70th Street SE - from TH 13 to CSAH 23
These roadways primarily serve local access functions in residential areas and are also
relatively short segments on a county-wide scale. However, prior to being turned back, the City
would request that improvements be made to the affected roadway. Roadways that are turned
back may also be placed on the City MSAS system as a special designation.
PROTECT ACCESS
The City of Prior Lake, through its ordinances, has authority to approve developments
contiguous to city streets. Access guidelines oriented toward strengthening existing access
control standards should be adopted to the greatest extent possible. This should be done to
preserve the public investment in the roadway system while making available to developers those
Comprehensive Plan 2010
Chapter 4
Page 165
regulations under which plan preparation can occur. At the same time, however, it is important
that the county be equally diligent about protecting access to its facilities.
EST ABLISH IMPROVEMENT PROGRAMS
An overall strategy of improvement, tempered by fiscal constraints, begins with an
analysis of key intersection capacity improvement projects, safety improvements and the
protection of access by establishing strict standards and by designating necessary right-of-way.
Identifying future needs for facility rights-of-way followed by timely "set-aside" programs will,
in the long run, save the community much in the way of financial resources.
Roadway improvements should also be geared toward providing for transit needs,
particularly in the area of meeting turning radii, traffic signals and adequate roadway structure. It
should be pointed out that non-motorized travel needs also must be carefully considered. Prior
Lake will continue its policy of designating sufficient right-of-way to provide for sidewalk
and/or bikeway needs.
SOURCES OF FUNDING
Roadways under city jurisdiction are maintained, preserved, constructed and re-
constructed by the City Department of Public Works. Funding for these activities, including the
administrative costs of operating the department, are obtained from a variety of sources including
ad valorem taxes, special assessments, state-aid and tax increment financing. A major concern of
the City is the availability of sufficient funds for maintenance and construction activities. If
funds are unavailable, needed projects may be delayed or terminated and maintenance of existing
facilities may fall short of acceptable standards. The following discussion explains the existing
sources of funding and potential new sources of revenue.
State Aid
An extremely important source of revenue to the City is state-aid. A network of city
streets called Municipal State-Aid Streets (MSAS) is eligible for funding assistance with revenue
from the Highway User Tax Distribution Fund. This fund acts as a distribution or tax clearance
fund, and tax income received into the fund is transferred to various transportation-related funds
for expenditure. The fund receives revenue from two principal sources: 1) gasoline taxes and 2)
vehicle registration taxes.
Ninety-five percent of the net proceeds of the Highway User Tax Distribution Fund are
distributed annually according to a constitutionally mandated formula: 62 percent to the Trunk
Highway Fund, 29 percent to the County State-Aid Highway Fund, and 9 percent to the
Municipal State-Aid Street Fund. The Municipal State-Aid Street Fund is distributed by formula
to those cities eligible for MSAS funds.
Comprehensive Plan 2010
Chapter 4
Page 166
Assessments
Propeliy that benefits from a roadway scheduled for improvement may be assessed for a
portion of the cost of construction. In order to assess a propeliy owner, it must be demonstrated
that the value of their property will increase by at least the amount of the assessment. For this
reason, it is a limited source of revenue. Although it is also limited by the almost celiain
requirement that property be adjacent to the roadway, this is an important source of revenue for
the City.
Ad Valorem Taxes
If 20 percent of the cost of a city project can be assessed to the adjacent property owners,
the remaining cost of the project can be added to the ad valorem or property taxes of the
remaining property owners in the City. Ad valorem taxes for street improvements are excluded
from the state mandated levy limits.
Tax Increment Pinancing
Establishing a tax increment financing (TIP) district is a method of funding infrastructure
improvements that are needed immediately using the additional tax revenue to be generated in
future years by a specific development. Municipal bonds are issued against this future revenue
which is dedicated for a period of years to the repayment of the bonds or to other improvements
within the TIF project area. When used appropriately, a TIP can accelerate economic
development in an area by insuring that the needed infrastructure is in place without requiring
support from the usual funding.
Federal Surface Transportation Program (STP) Funds
STP is a categorical funding program created under the Intermodal Surface
Transportation Efficiency Act (ISTEA) and continued under the current federal funding process
(TEA-21). The Metropolitan Council, through its Transportation Advisory Board, solicits
projects (generally on an annual basis) through a competitive process using a set of evaluation
criteria. Generally, "A" minor arterial projects and enhancement projects such as
pedestrian/bikeways are funded through this program.
Congestion Management and Air Quality (CMAQ) Funds
CMAQ is a categorical funding program created under the lntermodal Surface
Transportation Efficiency Act (ISTEA) and continued under the current federal funding process
(TEA-21). These funds are directed to projects that contribute to meeting national air quality
Standards and generally include projects such as transit, non-motorized transportation and travel
demand management. The Metropolitan Council, through its Transportation Advisory Board,
solicits projects (generally on an annual basis) through a competitive process using a set of
evaluation criteria.
Comprehensive Plan 2010
Chapter 4
Page 167
CHAPTER 5
(UPDATED SECTIONS)
THE EXISTING SYSTEM
GENERAL ASSESSMENT OF EXISTING PARK, NATURAL RESOURCE, AND
TRAIL SYSTEMS
Parks
The first parks in Prior Lake were developed in the early 1970's. As the community grew
so did the park system. Through purchases supplemented by state and federal grants, a bond
referendum, and development dedications the system became what it is today. The existing park
system consists of 33 sites with a total of 517.53 acres. Of the 517.53 acres of existing parkland
there are 247.25 acres that are available for active and passive recreation and 270.28 acres that
are natural resource and preservation areas. These natural resource areas contain a variety of
woodlands, wetlands, and meadows. The park system contains a diverse mixture of lands, much
of which could be described as valuable community assets and other portions which were
development leftovers. Prior Lake is not alone in this dilemma. Many other communities end up
with park property dedications that contain odd shaped parcels and undevelopable land.
Fortunately many of these less desirable development areas contain a mixture of natural resource
amenities, and from a preservation standpoint can be viewed as valuable community assets. The
concern of future development of the park system is that there will be a need for additional
active recreational space and that these natural resource areas should not be as high a priority and
that land dedications should consist of stable, flat, upland areas. This does not mean that the city
will not pursue the acquisition of valuable natural resource areas but should be more selective
when accepting dedication parcels that will not meet the recreational needs of the community.
The Wetlands Conservation Act of 1991 will protect the cities wetlands and with the current city
tree ordinance the preservation of natural resources within the community will happen without
the city accepting these parcels as part of the development dedication.
Trails
The trail system in Prior Lake consists of approximately 32.74 miles of existing
community sidewalks and trailways. The trail system includes the following:
Sidewalks
Bituminous Trails
Internal Park Trails
11.80
13.87
7.87 miles
Total Trail Miles
32.74 miles
The strong nationwide trend toward trail development is also present in Prior Lake.
People of all ages are seeking safe and enjoyable corridors for walking, jogging, in-line skating,
and biking. Trails will link together public parks, commercial and industrial areas, regional
trails, and schools. Prior Lake is currently at the development stage where parks, roads, housing,
and commercial areas are yet to be developed. This puts Prior Lake in the enviable position of
being able to plan trail corridors ahead of development (rather than squeezing them into existing
Comprehensive Plan ~ 2020
Chapter 5
Page 191
developed areas). This translates into a slow paced "build as you develop or redevelop"
approach unless outside funding sources are found. In all future areas of development and road
reconstruction trails must remain a crucial element in the design, and all efforts will be made to
link neighborhoods, parks, industrial, and commercial areas with trailways. The addition of
minor collector streets to the hierarchy of streets in the City trail plan will shift a portion of the
burden for trail construction to subdivision development where it becomes part of the cost of
platting land.
The recommended trail system for Prior Lake includes all the minor arterial streets, major
collector streets and the proposed minor collector streets. Smaller trail systems within
subdivisions and development proposals should be built to augment the City-wide trail system
and provide access points to neighborhood parks. The trail proposed along Highway 13 is
expected to be the most difficult to achieve, since it will involve negotiations with the Minnesota
Department of Transportation before implementation. The Highway 13 trail is a critical link in
the trail system as it provides the connection between County Road 42 and County Road 21.
This trail connection would complete a loop around Lower Prior Lake and would also connect to
the regional trail system and provide access to two regional parks. There is currently a Highway
13 Task Force which is discussing the Highway and future design elements.
Another trail section that has been recommended for construction is a section of trail
which would run along 170th street S.W.. This trail section would tie into the trail on
Northwood road and also bring a connection to the Spring Lake Regional Park.
Internal access trails within neighborhood parks are well received and looped trails within
a park provide accessibility as well as an excellent opportunity for exercise and casual strolls.
The map found on the last page of this chapter indicates the proposed community wide
trail system for Prior Lake.
Athletic Facilities
Based on the demand for facilities experienced by the Prior Lake's Athletics' for Youth,
Soccer Club, community recreation and athletic programs, there has been a need for additional
athletic fields. Athletic fields are being programmed in some neighborhood parks that would be
better left available for informal games and casual use. There has been a consistent growth in all
sports and fields are in high demand and scheduled to the maximum. The fields are showing the
wear ofthe constant use and with the overlapping seasons and multi-sport use ofthe fields proper
turf maintenance is not possible.
With the passing of the 1997 Parks and Library referendum the city is currently in the
process of developing a 38.4 acre parcel of land known as the Busse property. This property will
accommodate a wide variety of youth athletic fields including: soccer, football, baseball, and
softball. The city is also searching for another 40-50 acre parcel which would be developed to
accommodate adult softball and baseball. When this adult softball/baseball complex is
completed the existing adult softball fields located at The Pond's Park would then be converted
to youth baseball and softball fields. With the development of the adult and youth athletic
Page 192
Comprehensive Plan ~ 2020
Chapter 5
facilities we will be able to accommodate the current and future needs of athletic user groups for
many years to come.
There are currently two outdoor hockey rinks at Lakefront park which seem to be meeting
the current needs. The indoor ice arena at the Dakota Sports and Fitness Center currently serves
the needs for organized hockey practice and games. A shortage of outdoor hockey rinks will
occur given a growth in the sport and the community. Consideration should be given to an
outdoor skating and hockey facility should another community park be built. The Lakefront
Master Plan includes the paving ofthe two hockey rinks to accommodate in-line skating.
Currently there are seven tennis courts at the Prior Lake High School which were funded
by the City and the school district. These are the only tennis courts currently available to the
public. Though the sport of tennis has declined over the years there have been requests
throughout the community for tennis facilities. The Lakefront Park Master Plan includes the
development of two additional tennis courts. With the development of these two courts we
should be able to fulfill our tennis court needs for now.
Natural Resources
The value of environmentally sensitive natural features have typically in the past not been
of concern in a park and recreation system. Generally, park system plans concentrated on sites
for recreation use only and policies cautioned against accepting sites that did not have recreation
value. A current trend emerging has local communities accepting woods, steep slopes, creeks,
and wetlands for preservation. Ifheld a high enough priority, this acquisition of natural features
is often at the expense of a completed recreation park system or a slower or more expensive
recreation park system. While nearly 50 % of the current park system is contained in natural
areas consisting of woods and wetlands caution should be taken this trend towards the
preservation of natural resources does not have a detrimental impact on the need for active
recreational space. It should be considered that all parkland could be considered the preservation
of land and open space whether it be active, passive, or a natural resource area.
Comprehensive Plan ~ 2020
Chapter 5
Page 193
pARK NAME pARK pARK NATURAL pARK
TYPE STATUS AREA ACRES
ACRES
BOUDINS M D 0 1.25
BROOKSVILLE HILLS M D 1.5 3
BUSSE C U 0 38.4
CARDINAL RIDGE N PD 31 42.5
CARRIAGE HILLS N PD 0 5
FISH POINT N D 5 9
GRAINWOOD CROSSINGS M PD 0 2
GREEN OAKS M D 0 2
HERITAGE S D 0 .5
INDIAN RIDGE M PD .5 .2
ISLAND VIEW M D 2 4
KNOB HILL N U 12 13.5
LAKEFRONT C D 93 141.18
MEMORIAL C D 0 11.5
NORTH SHORE OAKS N PD 3 5
NORTHWOOD M PD 0 1
OAKLAND BEACH M D 0 1.5
RASPBERRY RIDGE N D 5 16
RASPBERRY WOODS NAT U 22 22
SAND POINT BEACH C D 1.5 20
SAND POINT N D 0 6
SUNSET HILLS N D 1.6 3.5
THE PONDS C D 15 70
W ATZL'S POINT BEACH S D 0 3
WESTBURY PONDS N PD 16.5 22
WILDERNESS PONDS MlNAT U 1.5 20
WILDS 1 M U 2.5 2.5
WILDS 2 M U .5 .5
WILDS 3 NAT U 16 16
WILDS 4 NAT U 9 9
WILLOWS N D 0 2.5
WOODRIDGE N U 0 7
WOODVIEW NAT U 16 16
TOTAL 255.10 517.53
P ARKS LIST
ACRES ACTIVELY MAINTAINED
NATURAL AREAS MANAGED
TOTAL PARK ACRES
247.25
270.28
517.53
PARK TYPE
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N NEIGHBORHOOD
M MINI
NAT NATURAL RESOURCE
S SPECIAL USE
STATUS
D DEVELOPED
P P ARTIALL Y DEVELOPED
U UNDEVELOPED
F FUTURE PARK
Page 194
Comprehensive Plan ~ 2020
Chapter 5
PARK AMENITIES
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4 CARDINAL RIDGE #2 42.5 1 X X X X X
5 CARRIAGE HILLS 5 1 X X X X X X X X X X
6 FISH POINT 9 X X X X X X
7 GRAINWOOD CROSSING 2 X X X X X X
8 GREEN OAKS 2 1 X X X X X X
9 HERITAGE 0.5 X
10 INDIAN RIDGE 0.2 X X X X X
11 ISLAND VIEW 4 X X X
12 KNOB HILL 13.5
13 LAKEFRONT 141.18 1 3 X 2 X 2 X X X X X X X X X X X X X X X X X
14 MEMORIAL 11.5 1 X X X X X X 2 X X X X X
15 NORTH SHORE OAKS 5 X X X
16 NORTHWOOD 1 X X X X
17 OAKLAND BEACH 1.5 X X X X X X
18 RASPBERRY RIDGE 16 1 X X X X X X X
19 RASPBERRY WOODS 22 X X
20 SAND POINT BEACH 20 3 X X 2 X X 2 X X X X X X X X
21 SAND POINT PARK 6 1 X X X X X X
22 SUNSET HILLS 3.5 1 X X X X X X X
23 THE PONDS 70 1 8 4 X X X X X 3 X X X X X X X
24 WA TZL'S POINT 3 X X X X X X X X X
25 WESTBURY POND 22 X
26 WILDERNESS POND 20 X X X X X
27 WILDS 1 2.5
28 WILDS 2 0.5
29 WILDS 3 16
30 WILDS 4 9
31 WILLOWS 2.5 1 X X X X X X
32 WOODRIDGE 7 1 X X X X X
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Comprehensive Plan ~ 2020
Chapter 5
Page 196
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Comprehensive Plan ;w.w 2020
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EXISTING PARKS INVENTORY AND RECOMMENDATIONS
Park Name
Type
Acres
Boudins
Mini
1.25 Acres
Boudins park is located on Rutgers Street and Watersedge Trail which is in the Northeast
corner of Prior Lake. The park was developed in 1977. New modular playground equipment
was installed in 1998. A picnic shelter was constructed in the park in 1995. The park includes a
backstop with a small aggregate infield and short outfield which is suitable for T -ball and
elementary age softball and baseball.
Brooksville Hills
Mini
3 Acres
Brooksville Hills is located near Brooks Court and Credit River Road in the Southeast
section of the city. This mini park is surrounded by homes on three sides and has a trail leading
from Brooks Circle to a small playground area. It has no streets abutting the park. The
playground equipment was installed in 1995 and includes freestanding swing, slide, and merry-
go-round. The playground was bordered with a poured concrete curb which is permanent,
attractive, low maintenance, and more economical than the standard wooden landscape timbers.
There is a possibility that the park could expand and road access be provided should the property
to the east of the park develop. A bituminous path and park identification sign was constructed
in 1998 on Brooks Circle, which helps neighbors locate and access the park.
Cardinal Ridee
Neiehborhood
42.5 Acres
Cardinal Ridge includes three tracts of park property and is located on Crossandra Street
and Fish Point Road. This park is located in the Southeast section of the city. A trail was
constructed in ! 997 which runs through the development and connects Highway 44 to Crossandra
Street, as well as providing an access to Markley Lake. There is a soccer field in the central
portion of the park. Due to severe topography there was no area suitable to build a parking lot to
serve the soccer field, so as part of the development of Fish Point Road the city required that the
developer provide parking bays along Fish Point Road. This concept worked well here and
should be considered in future development where parking lots would impact the actual park
property. A small 20 car parking lot was constructed on Crossandra Street which allows park
visitors the opportunity to access Markley Lake and use the trail system and playground
equipment. New playground equipment was installed in 1998. Approximately 5 acres of this
park is comprised of woods, wetlands and stormwater ponds. The pond is used as the pleasure
rink for this park.
Carria~e Hills
Neiehborhood
5 Acres
Carriage Hills is located on Carriage Hills Parkway in the northcentral section of the city.
The park has homes on three sides with three access points going into the park from the
surrounding streets. Park development was completed in the fall of 1996. The park amenities
include a large ballfield, picnic shelter, modular playground equipment with some freestanding
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tot apparatus, sand volleyball, a hard surface play area, and pleasure rink. The park design
includes an internal path system which makes all amenities accessible and provides a loop
around the park for exercise and enjoyment.
Fish Point
Nei2hborhood
9 Acres
Fish Point is located between 150th Street and Fish Point Road which is in the Northeast
section of the city. The park was acquired in 1979 and development began in 1980. Fish Point is
a walk-in park with no off street parking. The majority of the park is in a valley with rolling
terrain and woods. Approximately 7 acres of this park are in a natural state and includes woods,
wetlands, stormwater ponds, and open drainage ditch. The open areas do include an old style
playground, a picnic shelter which was constructed in 1994, and basketball court which was
constructed in 1995. There is a bituminous path which enters the park from 150th and a gravel
road/path which enters the park from Fish Point Road. The 1999 Capital Improvement Program
includes the paving of this trail section as well as replacement of the playground equipment.
There is a possibility that a trail could be constructed at the end of Forest Circle which would
provide a third access point, however, this is in a low area which is heavily wooded al1d trail
design could be difficult.
Grainwood Crossin2
Mini/Soecial
2 Acres
Grainwood Crossing is located on Highway 21 and Quincy Street in the central part of
Prior Lake adjacent to the bridge crossing that separates upper and lower Prior Lake.
Grainwood Crossing was purchased in 1993 with the aid of a State of Minnesota Outdoor
Recreation Grant. The concept was to have a park which would represent the history of the
railroad crossing which ran through this area and across the lake. This property also provides
another access point for the public to fish and picnic by the lake. In 1995 construction was
completed on a rest area which was designed after the original train waiting area. This rest area
will contain historical information regarding the site and the history of the trains which went
through this area. The park area also includes portable toilet enclosures, handicapped parking,
paths, picnic area, and a Minnesota Department of Natural Resources fishing pier which was
acquired through a grant.
Green Oaks
Mini
2 Acres
Green Oaks is located on Green Oaks Trail and 150th Street in the northeast section of
Prior Lake. The park was developed in 1977 and was totally renovated in 1997 . The renovation
included new modular playground equipment, relocation of the backstop and skating rink, as
well as grading and storm sewer installation, which corrected the drainage problems. A picnic
shelter was constructed in the park in 1995. The playfield is small and can accommodate
elementary age children.
Heritaee
Mini/Special
.5 Acres
Heritage is located on Highway 21 and Quincy Street which is in central Prior Lake near
the bridge crossing and directly across the street from Grainwood Crossing. This small piece of
park property provides a scenic overlook of the lake and a rest area for visitors and trail users.
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This site includes benches, flagpoles, and memorial/centennial paver bricks. This mini park
compliments the Grainwood Crossing park and is a unique landmark in the center of the
community. It is also the site of one of the rose gardens in our park system.
Indian Ridee
Mini
.2 Acres
Indian Ridge is located on Fairlawn Shores Trail and Indian Ridge Circle which is in the
northeast section of Prior Lake. Indian Ridge is a small thin piece of park property which was
acquired through tax forfeiture. The park was totally renovated in 1997. The renovation
included grading and turf development, new modular playground equipment, hardcourt area, and
streetside parking bays. Future plans include a picnic shelter.
Island View
Mini
4 Acres
Island View park is located near Fremont Avenue and the access to the park is located on
Crystal Circle. The park is IS to 20 feet lower than Crystal Circle and is hidden behind a row of
homes. The park has a playground and limited open space. The property to the North of this park
has been purchased and is being developed(Glynwater Townhomes). This new development
includes a natural area with a trail which will eventually be connected to Island View park. A
trail is also proposed to connect Crystal Circle with this new trail system at Glynwater. New
playground equipment is proposed for 2000.
Knob Hill
Nei!!'hborhood
13.5 Acres
Knob Hill park is located on Carriage Hills Parkway and Hummingbird which is in the
northeast section of Prior Lake. The park is divided by Carriage Hills Parkway with the smallest
portion of land being on the south side of the street. The concept for the smaller portion of park
is to combine this with additional dedication property when the adjoining property is developed.
This piece of property would also provide an excellent opportunity to extend a greenway/trail to
the proposed park on the lake. The parkland which is located on the north side of the Parkway is
comprised of woods, wetlands, and steep slopes. Though this is the largest portion of the park,
there is little space available for park development. At best a playground and picnic shelter
could be included in this area. The current plan is to develop a trail system through this park
which would connect Carriage Hills Parkway with the new trail on County Road 42. The portion
oftrail through the park is slated for Fall of 1999.
Lakefront
Community
126 Acres
Lakefront park is located on Ridgemont RoadlMain Street and at the west end of County
Road 44. The park is in the center of the city and within walking distance of downtown Prior
Lake. The park was purchased with a Park Bond Referendum and the assistance of a State and
Federal grant in 1975. In 1978 an additional 7 acres was acquired which is now Watzl's Point.
This park has been labeled as the 'jewel" of the park system. A Master plan was completed in
1996 which identified the potential, as well as the limitations of the park. With the passing of the
1997 Park and Library Referendum there is funding available to complete the development of the
park. The development will include new access road, paved parking, multi-purpose pavilion,
playground equipment, amphitheater, trails, tennis courts, soccer fields, baseball diamond, prairie
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and wetland restoration, paved hockey rinks, skating, and picnic areas. Community involvement
was a critical element in the design of the park and this "jewel" will shine by the year 2000. The
Master Plan moved the road so that access will be on main street and wrap around a pond near
downtown. This beautiful new parkway will provide easier access for our user groups, be a
unique connection to downtown, and keep the traffic out of a quite neighborhood. The Kop
family originally owned the park property and when they sold the park to the city they retained
15.18 acres, where they currently reside and operate a small farm. The farm is situated within
the southeast portion of the park. Negotiations with the Kop family are currently underway as
acquisition of this property is critical to the final design of the park and to preserve this beautiful
piece of property for future generations. The acquisition of the farm property will provide a
better access road to the park, enable us to expand the athletic fields, provide areas for wetland
and prairie restoration, and the 1886 farm house will be preserved as a historical farm site.
Memorial
Community
11.5 Acres
Memorial park is located on County road 44 and Memorial Trail which is in the east
central portion of the city. Memorial park was developed in the early 1970's and the park
includes an adult baseball field, two picnic shelters, playground equipment, and a large picnic
area. The picnic area is nicely wooded with a predominance of mature oak trees. In 1996 a new
concession/restroom facility was built which is a major improvement over the old facilities. The
large picnic shelter is heavily used and the addition of the new restrooms accommodates the
picnickers as well as the ball players and spectators using the baseball field. The old wooden
playground structure was replaced in 1998 and is now one of our most popular playground sites
in the city. A new P.L.A.Y storage building was also constructed on the site. Trail connections
were made to County Road 44, a new 30 car parking lot and a full size basketball court were also
completed in 1998. The Prior Lake V.F.W. has contributed a great deal to the development of
this park. The High School Baseball Boosters also contributed a new computerized scoreboard.
Neiehborhood
5 Acres
North Shore Oaks
North Shore Oaks is located on Fisher Avenue and Ferndale which is in the north eastern
portion of the city. The park is five acres of which three are wooded and hilly. This left little
area for the playground and open playfield. A freestanding playground was installed in 1995
which includes slide, swing and merry-go-round. Concrete curbing was used around the
perimeter of the playground (which is our new standard). This curbing is permanent, attractive,
low maintenance, and more economical than the standard wooden landscape timbers. There is a
greenway/trail which connects Fisher and Ferndale and this trail could be extended to the west
and tie into the proposed trail corridor which runs north to c.R. 42 as well as tie into the trails on
Carriage Hills Parkway . This park has expansion potential when the property to the west is
developed.
Northwood
Mini
1 Acre
Northwood is located on Northwood Road and Spring Lake Road and is in the Southwest
corner of the city. This park was totally renovated in 1997 and includes a skating rink,
playground equipment, and a picnic area. There is a need for trees on the northeast corner of the
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park. With the development of Northwood Road there is now a new trail which connects the
park with the Northwood Road neighborhood.
Oakland Beach
Mini
1.5 Acres
Oakland beach is located between Maple Trail and Rustic Road and is situated in the
northeast section of the city. This small mini-park is entirely surrounded by homes and has three
access trails leading to the surrounding streets. This park includes a skating rink, picnic shelter,
and new playground equipment that was installed in 1998. This small park was devastated by
the storm of 1998 and plans are underway to replace many of the trees which were destroyed in
the storm.
Raspberry Ridt:e
Nei~hborhood
16 Acres
Raspberry Ridge is located on C.R. 21 and Lords Street in the central portion of the city.
Though this park is 16 acres there is only 5 acres which can be used for active recreation. The
park includes free standing swing, slide, and merry-go-round as well as a picnic shelter and a
ballfield. A new parking lot and trails were constructed in 1997. There is a missing link of trail
that would connect the existing trail from Raspberry Ridge Road to the trail on C.R. 21. This
trail section will be completed in 1999. New playground equipment is slated for 2000. The
majority of the park contains woods and wetlands.
Raspberry Woods
Natural Resource
22 Acres
Raspberry Woods is located on Coachman Lane and C.R. 21 and is situated in the north
central section of town. Raspberry Woods is an environmental open space park which has many
trail connections. The trails enter from the north connecting the Carriage Hills neighborhood
and also to the south which will connect the Raspberry Ridge neighborhood. The trails can
extend from C.R. 21 and continue east to future developed areas on the Vierling property and
proposed parkland. The concept of greenways is very popular, where trail users have the
opportunity to get away from automobile traffic and can experience nature. This park provides
that opportunity. Trail development in this park was difficult due to varying terrain, wetlands,
and woods. A boardwalk was constructed over a wetland area and provides a nice variation to
the standard trail, and also allows people to pass through the wetland and experience yet another
natural amenity.
Sandpoint Beach
Community
20 Acres
Sandpoint Beach park is located at the end of Crest Avenue and has lakefront on Prior
Lake. Sandpoint is situated in the northwest section of the city. Sandpoint is one of the most
popular parks in the city. The park contains a 900 feet of lakeshore, guarded beach and
bathhouse as well as two large picnic shelters, two modular play structures, sand volleyball,
fishing dock, and nice open space/picnic areas. This park is one of the most popular picnic sites
due to the fact that it contains so many amenities. Situated next to the park is a DNR public boat
access and parking area which is heavily used. In 1995 the parking lots and roadways were
paved which greatly improved the area. The Lions club of Prior Lake have contributed a great
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:;;j:'.
deal to the improvements within the park. This park experiences a great deal of vandalism and
future plans should include additional overhead lighting.
Sand Point
Neiehborhood
6 Acres
Sand Point park is located on Cedarwood Trail and Aspen Avenue which is in the
northwest section of the city and directly north of Sand Point Beach park. The park has three
access points into the neighborhood. This park is an area of open space which includes a
ballfield, free standing play equipment which includes a slide, swing, and merry-go-round.
There is also a picnic shelter as well as hard surface play area. Improvements to the park should
include additional trees and landscaping as well as a small parking lot next to Cedarwood Trail.
This parking lot would be nice in this neighborhood park as it would decrease the on street
parking, however, this may be difficult due to the proximity of the neighbors. There is room for
the parking lot and there would be ample space between the lot and the homes, but such lots are
difficult to construct after the homes have been established. Trail connections from the streets to
the picnic and playground areas are slated for 2001.
Sunset Hills
N eii:hborhood
3.5 Acres
Sunset Hills is located on Sunset Trail and Balsam Street which is situated in the
southwest corner ofthe city. Sunset Hills is an example of a smaller park which is being utilized
as a neighborhood park. Sunset hills contains a small ballfield, picnic shelter, play equipment
which includes independent swing, slide, and merry-go-round, hard surface court, and sand
volleyball. New playground equipment is slated for 2000. A major concern with this park is the
drainage in the southeast corner of the park. This area holds water after a major rain event and it
would be advantageous to provide additional downstream ponding and engineer the stormwater
system so that stormwater is diverted to a wetland situated downstream from the park. Park staff
should continue to work with the engineering staff to correct this drainage problem.
The Ponds
Community
70 Acres
The Ponds is located on 170th Street and is situated in the southeast corner of the city.
Development of this community park/athletic complex began in 1980 and this park has
developed into the city's premier athletic complex. The older portion of the park includes two
soccer/football fields, baseball field, six fenced softball fields, playground structure, two picnic
shelters, concessions and restrooms, sand volleyball, and a full size hard court area. As a result
of the 1997 Parks and Library Referendum we have been able to add field lights on four of the
softball fields and both of the soccer/football fields as well as install an irrigation system, and a
large playground system.
As the community continues to grow there is an increasing demand to provide additional
youth athletic fields in Prior Lake. The Ponds is currently being used for adult softball five days
a week and should a new community park be developed the adults could move to this facility and
the youth would take over The Ponds. As the neighborhood develops around The Ponds it would
be advantageous to move the adults to a larger lighted complex where the population is less
dense and allow youth sports, which tends to be less intrusive, utilize all of the fields at The
Ponds. The softball fields at The Ponds have 280 foot outfields with no opportunity for
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expansion. In order for the city to attract large sanctioned adult softball tournaments outfields
must be a minimum of 300 feet. Prior Lake should continue to provide adult softball leagues and
tournaments. Softball provides an excellent adult recreational activity and also generates
substantial revenues. (It is estimated that one weekend adult softball tournament will contribute
approximately $50,000.00 to a community.)
The back portion of The Ponds was developed in 1997-98 and includes 2 additional
soccer fields, 2 softball/baseball fields, archery range, picnic areas, parking lot, and a very nice
path system that meanders throughout the park. When developing this area extreme care was
taken not to disturb the wetlands and natural areas. This resulted in a blend of active, passive,
and natural areas which make this a very unique park. Critical to the success of this expansion
was the addition of an access road which leads to Mushtown Road. The larger soccer field
should be irrigated in order to protect the turf, enable proper turf development, restrict the growth
of weeds and provide a safer playing surface.
Special Use
3 Acres
Watzl's Point Beach
Watzl's Point Beach is located at the end of Red Oaks Road and is situated within
Lakefront Park in the center of the city. Watzl's contains a nice small beach as well as bathhouse
and concession building. Future plans include a fishing dock in the bay which is north of the
beach as well as some type of water play equipment. The majority of the beach users come by
boat or personal watercraft. When construction of Lakefront Park is completed the new trails
and parking lots should make it easier for people to access the beach.
Westbury Ponds
Neiehborhood
22 Acres
Westbury ponds is located on Pershing Street and directly west of the Five Hawks
Elementary School. The parkland contains a mixture of wetlands, stormwater ponds, woods, and
varying terrain. The park includes a trail which winds through the woods and around the
wetlands. The concept for the trail is to continue the trail extension to the school property and
continue to Priorwood Street. The park has very little open space and it would be very difficult
to provide a playfield. There is a large play structure at the school which is used by the
neighborhood children and is be easily accessed with the new trail. The city recently helped the
School District construct a nature center around the pond.
Wilderness Ponds
Mini/Natural Resource
20 ACRES
Wilderness Ponds is located on Fish Point Road and County Road 21 and is situated in
the southeast section of the city. This park is comprised mostly of wetlands with a small open
space available on Fish Point Road. There is a new trail system incorporated in the development
which takes residents from C.R. 21 to The Ponds, which is located directly to the south of the
development. There is 1.5 acres available for park development and plans for the park include a
trail, small picnic shelter, and small open play field, new playground equipment was installed in
1998. The main attribute ofthis park is the availability of the trails which lead into The Ponds.
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Wilds 1
Mini
2.5 Acres
Wilds 1 is located on County Road 82 and Wilds Parkway which is situated in the east
central area of the city and is at the comer of the southern entrance points of the Wild's
development. This park has not as yet been designed and continued discussions with the
developers will be necessary to develop a plan for the park. Though funds have been allocated it
would be best to wait and see what the neighborhood needs may be. The developer has
suggested that we trade this small park for another piece of property which is located within the
development and away from the busy intersection.
Wilds 2
Mini
.5 Acres
Wilds 2 is located on Oak Tree Drive and situated in the central portion of the Wild's
development. This park area has very little upland space and contains a holding pond and
wetlands area. In the original conceptual plan there was a tennis court designed in this park area.
If the developers wish to pursue the tennis court concept then they would be required to fund the
courts as the city does not have the funds to construct a court. The current city standard for park
development does not include tennis courts. If the developers wish to pursue the idea of tennis
courts in any of the parks within the Wild's they must be aware that these courts would be
available for the use of the entire community and would not be treated as private courts.
Wilds 3
Natural Resource
16 Acres
Wilds 3 is located on Wilds Ridge Road in the northern portion of the Wild's
development. This parkland has a variety of natural features including woods, wetlands, and a
small lake. Plans for this area include a greenway/trail that would connect to Wild's park 4 and
continue on to the Jeffer's Pond development. Again, if the developers request any park
development that would not be consistent with current park standards it should be the developers
responsibility to contribute to the park development.
Wilds 4
Natural Resource
9 Acres
Wilds 4 is located in the northeastern section of the Wild's development. This park also
has a variety of natural resource features and future plans include the development of a
greenway/trail that would access the Jeffer's Pond development. There have not been any design
plans for this park as yet and as mentioned before continued discussions with the developers will
be required to develop a park plan. Names for the 4 Wild's parks have not been determined as
yet.
Willows
Neiehborhood
2.5 Acres
Willows park is located on 170th Street and Elm Avenue in the south central portion of
the city. This smaller neighborhood park was developed in the late 70's. The park was totally
renovated in 1998 and includes new playground equipment, parking bays, and new backstop.
Plans are being made to construct a 1/2 court hardcourt area. A picnic shelter was constructed in
1995. Landscaping was complete along 170th Street an a chain link fence was installed to keep
children out of the busy street.
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Woodrid~e
Neiehborhood
7 Acres
Woodridge park is located on Toronto Avenue in the southeast section of the city. This
park has homes on three sides and a small portion of land directly to the west of the main park
across the street from Toronto Avenue. The elevation and configuration of the park does not
provides only enough space for a small softball field, play structure, and picnic shelter. The
smaller piece of park property across Toronto Street is utilized as a small pleasure rink. This
park does include a trail which leads through the neighborhood into The Pond's park. For athletic
fields and large open play areas this neighborhood does have easy access to The Pond's.
Woodview
Natural Resource
16 Acres
Woodview park is located on Highway 13 and Sunset Trail and situated in the southwest
section ofthe city. Woodview is a mixture of woods and wetlands and will be preserved as such.
This park provides a unique a greenway/trail through the park which would connects the Spring
Lake/Sunset Hills neighborhood with Willows park to the north and ties into the development to
the east. This park should remain as an natural resource park. A management plan should be
developed for this natural resource area which would include a tree inventory and management
plan.
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PRESENT AND FUTURE CONCERNS
Play~round Equipment
Over the last three years the majority of the playground equipment in Prior Lake has been
converted to the newer modern modular systems. This trend in playground equipment provides
a variety of physical and social skills. There is a multitude of equipment on the market today and
the newer equipment provides accessibility for the disabled as well as provide a variety of play
options which can keep children occupied for long periods of time. Another consideration when
purchasing new playground equipment is safety. All new playground equipment which has been
installed conforms to the Consumer Product Safety Commission (CPSC) guidelines. When
considering funding for future parks adequate funds should be included which will allow for the
installation of newer style playground equipment which provides accessibility, meets safety
standards, and provides a wide variety of activities for children of all ages. Consideration should
also be given to the installation of the equipment by the manufacturer. The new modular
equipment requires precise installation to assure that all components interconnect properly and
that all spacing and heights meet safety guidelines.
Parkin~ in Nei~hborhood Parks
At present there are no parking lots in any of the neighborhood parks. When future parks
are developed parking lots should be included in the design. Parking lots provide for better park
access as well as keep cars off of neighboring streets. The parking bays along streets will
sometimes suffice when there is limited land available.
Future Park Desi~n and Dedication of Land
The existing park system in Prior Lake includes over 50% of it's land in natural resource
areas including wetlands, woodlands, steep slopes, and stormwater ponds. With the current
needs for additional playfields and open space it is critical that future park dedications include
land that can be developed into useable playfields and provide enough open space for parking,
larger play structures, picnic areas, hard surface play courts, and other park amenities. It is a
typical trend in accepting park property that the city ends up with the undevelopable portion of
the development acres. At present the city has an adequate amount of park property comprised
of natural resource areas and it is critical to the future development of the park system that only
good useable upland park be accepted as dedication. Where there is not adequate upland
dedication property available then consideration must be given to accepting cash in lieu of land
so that land may be purchased or so other neighborhood parks can be developed to a higher
standard than currently exists.
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Future Fundin2 for Prior Lake Parks
A concern of the present and future park system has been the availability of funds for the
purchase of lands, the development of new parks, upgrading the existing system, and providing
indoor recreation space. Options for funding includes private donations, increasing developers
funding requirements, increase park dedication fees, dedicated park tax, bond referendum,
gambling tax, etc. The 1997 Parks and Library Referendum was successful and included funds
for the new Library/Resource Center, irrigation and lights at the Ponds, new playground
equipment, Lakefront Park development, and Community Park! Athletic Complex development.
This referendum will take care of some our community needs for many years to come. However,
this is a one time development resource, we need to be aware of continued growth, equipment
replacements, improvements, and ongoing maintenance of our parks and trails.
Needs for Indoor Recreation Space
In planning the future of the community consideration should be given to the need for
indoor recreation space. The new Library/Resource Center will accommodate our dance
program and be available for community events and meetings. The Dakota community currently
has a facility which is open to the public for swimming and athletic activities on a fee basis. It
may be possible to include space in a future school that would be available for recreational
programming. Community school facilities have been very successful in other communities and
communications with school district personnel would include the possibilities of a community
school facility.
Future Needs Assessment and Community
As Prior Lake continues to develop it is critical to the success of the parks and recreation
system that there is an ongoing analysis of the parks and recreation needs ofthe community. It is
imperative that a community survey be conducted so that future park and trail development is
driven by the needs of the community and so that recreation programs are based on the
community needs. Ongoing communications needs to exist between city staff and the
community. This communication can be accomplished through surveys, program evaluations,
public meetings, and open invitations to the public to attend Parks Advisory Committee
meetings. As the community develops there will undoubtedly be an increase in school age
children that will participate in sports and recreation programs. With this increase there will be
demands for additional parks and athletic fields. As mentioned there is a conceptual plan that
could meet the existing needs of the community but without further studies and surveys it would
be difficult at best to try to determine the future needs of the community. Future parks, trails, and
recreation programs should have a direct correlation to the demographics and socio-economic
status of the community.
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f' [,;
FUTURE OPPORTUNITIES (PROPOSED PARK ACQUISITIONS)
Kop Farm
The acquisition of the Kop farm property is critical to the final development of Lakefront
park. The property is virtually surrounded by the park and is 15.18 acres in size. The conceptual
plan would incorporate a portion of the farm into the existing park and restore the farm site as a
historicalleducational center, similar to the farms operated by the Parks and Recreation
Departments in Brooklyn Park and Lakeville. This concept would create a "living historical
farm" focusing attention on the way people lived and what animals and crops were raised on a
typical farm. The interest in such a farm includes the combination of animals that once were part
of every homestead and also demonstrate the way a typical farm would have been operated in the
early part of the century.. This particular farm is important to the heritage of Prior Lake and
because of its location it can contribute to the unique character of the Town Center. In general,
reestablishing an agricultural environment in a concentrated area is a meaningful step toward
introducing suburban children to our farm heritage. The land acquisition would also allow for a
better park access road, which would be located near the intersection of C.R. 44 and Main Street.
Vierlin~ Lakeshore Property
The Vierling's currently own property which includes approximately 1500 feet of
lakeshore on Prior Lake. (Identified on the future parks map). Due to severe slopes the
lakeshore portion of this property may be very difficult to develop. A portion of this property
should be acquired as parkland, in particular a portion along the east property line would provide
a greenway/trail section that would tie into and Knob Hill park, and also provide pedestrian and
bike access to the proposed parkland on the lake. This is one of the few remaining opportunities
to acquire lakeshore park property on Prior Lake and every effort should be made to make sure
that the park dedication on this future development area include lake frontage.
Jeffer's Pond
Jeffer's Pond has been identified as a potential natural resource/park site and is located in
the north central section of the city. This area includes a beautiful mix of hardwood forest, lake,
and wetlands. This is one of the last opportunities in Prior Lake to develop a traillgreenway
around a waterbody. An area of land to the northwest of the pond has been identified as an area
which would serve as a passive picnic area which would also include a parking lot. From this
area people could access the trail system that would encompass the pond and also have the
opportunity to fish, canoe, and picnic. The Jeffer's trail system would also tie into the trail
which would be coming from the Wild's and continue to Carriage Hills Parkway. Every effort
must be made in the future development of this land to include a traWgreenway around this pond
and provide access so that this beautiful area can be enjoyed by many generations of Prior Lake
residents.
Comprehensive Plan ~ 2020
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Park and Trail Search Areas
On the proposed Park and Trail Map, there are circles which identify future park and trail
search areas. These circles do not necessarily mean that there will be a park or trail within that
area. They identify an area that will be investigated as a potential site for park or trail
development when future development occurs.
Annexation Areas
The annexation policy in Chapter 3 provides that land use in the annexed area will be
determined as part of the annexation process.
Comprehensive Plan ~ 2020
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Page 209
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EXISTING PARKS & TRAILS
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IS REGIONAL PARK
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PROPOSED PARKS AND TRAILS
PROPOSED PARK
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~~
CHAPTER 7
SANITARY SEWERS
TABLE OF CONTENTS
INTR 0 D U CTI ON...................................................................................................................... 1
S COPE OF STUD Y ........... ...... ............. ............ ........... ............ ............. ....... ........ ......................2
EXIS TIN G CO ND ITI 0 NS.......... ....... ........ ....... ....... .................. ..... ...... ..... ...... ......................... 3
Wastewater Systems.. .... .......... .................... ................ ....... ......... ............ ... ............ ... .... .... ...... 3
In filtratio nfl n flow................................................................................................................... 6
PLANNING AND LAND USE.. .................... ........ .......... ............ ....................... ....................... 9
Gen eral............................................................................................................................. ....... 9
Plan n in g Period...................................................................................................................... 9
Lan d Use......................................................................................................................... ........ 9
POP ULA TI ON... ..... ........ ....... ... ....... .......... ..... .... ......... ..... ......................... ...... ............ ............1 0
W ASTEW A TER FLO WS ........................................................................................................11
COLLE CTION SYSTEM ANAL YSIS ....................................................................................12
CONCL USIONS AND RE COMMENDA TIONS ...................................................................16
Appendix A - Maps.... .................... .......... ..... .................. ....... ............... ....... .................. .......... .18
Appendix B - Eagle Point Sewer Model.................................................................................. 22
LIST OF FIGURES
Figure 3-1 - Existing MUSA Line in Prior Lake...........................................................Page 5
Figure 3-2 - Inventory of Prior Lake Lift Stations........................................................Page 6
Figure 3-3 - MCES Flow Records..................................................................................Page 8
Figure 3-4 -1997-98 VI Flows ........................................................................................Page 9
Figure 5-1 - MCES Projection of Population for the City of Prior Lake.....................Page 11
Figure 6-1 _ MCES Projection of Wastewater Flows for the City of Prior Lake .........Page 12
Figure 6-2 - Projected Future Wastewater Flows .........................................................Page 13
Figure 7-4 _ Incremental Flow Projection by Sanitary Sewer Service District............Page 17
Figure 7-5 _ Incremental Flow Projection - MCES System in Prior Lake ..................Page 19
Figure 7-1 _ Existing Sewer System ...............................................................................Page 23
Figure 7-2 - Line Diagram for Sewer Model.................................................................Page 24
Figure 7-3 - Sanitary Sewer Flow Districts ...................................................................Page 25
City of Prior Lake
Sanitary Sewer Comprehensive Plan Update
January, 1999
SECTION 1 INTRODUCTION
A comprehensive sewer plan is an important tool for efficiently and effectively providing
for a community's wastewater collection and treatment needs. The City of Prior Lake prepared
an initial comprehensive plan in 1979 and updated the original plan several times in the
intervening years. The most recent overall update was completed in 1995 and approved by the
MCES in 1996. The document has served as a guide for the development of the wastewater
treatment system constructed and operated by the Metropolitan Council Environmental Services
(MCES). This current update of the comprehensive plan is prepared in response to a requirement
of the MCES. Some portions of the 1995 update will be incorporated directly into this document
where appropriate to minimize the repetition of work effort.
The City of Prior Lake is located in Scott County approximately 20 miles from the Twin
Cities metropolitan area. The City is outside the main Metropolitan Urban Service Area
(MUSA), but it is served by the MCES as a free-standing metropolitan area.
The City of Prior Lake is primarily a residential community with typical support-type
commercial and industrial facilities. Commerciallindustrial land uses are primarily located
within the central business district, the Waterfront Passage Business Office Park and at various
locations along STH 13.
The Shakopee Mdewakanton Sioux Community (SMSC) is an independent community
that lies within the City of Prior Lake. The SMSC has residential and commercial development
areas. Wastewater from the SMSC and the city areas adjacent to the SMSC, flows directly to the
MCES Interceptor sewer at the intersection of County Roads (CR) 82 and 21.
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~~----
II ..
SECTION 2 SCOPE OF STUDY
The purpose of this update is to evaluate the existing sanitary sewer system and identify
improvements required in the future to address potential deficiencies. In addition, this update is
intended to provide information requested by the MCES for their planning purposes.
Page 2
Comprehensive Plan 2020
Chapter 7
SECTION 3 EXISTING CONDITIONS
3.1 Wastewater Systems
The existing wastewater collection and treatment system in the City of Prior Lake
includes a collection system serving approximately 98% of the current population and a major
MCES lift station and interceptor main. The MCES lift station is located at CR 21 and Industrial
Circle in the southeast area of the City. The lift station was constructed in 1978 when the City
wastewater treatment plant was abandoned. The lift station pumps wastewater from the
southeastern area approximately 4,600 feet through a six-inch force main to the MCES gravity
interceptor at CR 21 and Franklin Trail. The MCES interceptor is 10-inch from Franklin Trail to
State Trunk Highway (STH) 13, where it becomes 24-inch. The line continues as 24-inch,
flowing westerly parallel to and south of Pleasant Street to Park Avenue. At Park Avenue, the
line becomes 30-inch and flows north along the lakeshore until it crosses the channel between the
two lakes, and flows north along County State Aid Highway (CSAH) 21 (Eagle Creek Avenue).
At CR 82, the line becomes a 36-inch and continues north and east, generally following
CSAH 21, then east on CR 42 to Pike Lake Trail, where it flows north and out of the Prior Lake
City limits. The wastewater collected in Prior Lake is conveyed by MCES facilities to the
MCES Blue Lake Wastewater Treatment Facility (WWTF) located in Shakopee. The City of
Prior Lake has no direct treatment responsibility. The MCES provides treatment capacity for
Prior Lake at the Blue Lake WWTF within agreed-upon development plans within the local
MUSA, and bills the City for the operation and maintenance services of the MCES facilities
based on actual wastewater flow data. The existing MUSA line in Prior Lake is shown on Figure
3-1.
The Prior Lake collection system includes house and commercial sewer service pipes,
typically four to six inches in diameter, running from the individual buildings to a main or lateral
located in the street. The laterals in the street (generally eight to 10 inches in diameter) flow to
larger interceptor pipes (12-inch to 36-inch in Prior Lake), which are generally located in the low
areas of the City and follow the natural drainage paths to the regional treatment facility. In areas
where natural gravity drainage is not possible, a pumping station, also called a lift station, is
necessary to raise the elevation ofthe wastewater and re-establish gravity flow. There are 29 lift
stations in the City of Prior lake as listed in Figure 3-2.
The existing wastewater collection system is included on the map identified as Figure 7-1
in the Appendix. The collection system includes approximately 71.7 miles of sewer pipe ranging
in diameter from eight-inch to 36-inch. In the central (older) part of the City, the sewer mains
are constructed of vitrified clay pipe (VCP), and in the newer areas (within the last 15 or more
years), the mains are generally polyvinyl chloride (PVC) pipe. In most situations, VCP sewers
are extremely durable but the joints can be significant problems. VCP sewers have numerous
joints because the pipe segments are normally two to eight feet in length. Historically, several
products were used to seal the joints such as oakum, tar, and cement mortar, but most of the
products have a limited life. In recent years, the VCP industry has developed a rubber gasket
joint which appears to be more effective at sealing the joint, but the laying length remains at
about eight feet, so there are over 40 joints in a typical manhole run of 330 feet. Joint problems
that may be expected with the older VCP sewers include offsets which can obstruct flow, root
Comprehensive Plan 2020
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intrusions from area trees, and vertical or horizontal misalignments due to settlement or
inadequate foundation preparation. In Prior Lake, a good routine preventive maintenance
program has been effective in avoiding any chronic backup problems. The entire collection
system is cleaned at least every three years and repairs are made as necessary when they are
identified. Major problems are corrected as soon as they are located and identified and minor
problems are typically corrected prior to street reconstruction or as monies are available in the
budget.
The newer areas with the PVC sewer pipe generally do not have joint problems because
the pipe has a rubber gasket to seal the joint area, and the pipe segments are about 13 feet long so
there are fewer joints. Occasional problems with PVC pipe do occur when the pipe is not
installed correctly, but these types of problems can normally be corrected by internal grouting of
the joints. In areas with PVC sewers, the manholes and the manhole/pipe connections generally
tend to be the greatest source of ground water leaking into the sewer mains.
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F'
3 1 E" MUSA L' . P'
ak
19ure - - xlstmg mem norL e
lFigure 3-2 - Inventory of Prior Lake Lift Stations
Lift Size 0
Station Location Cap. FM Brand Name iNo. o !Horsepower Phase Voltage Year
No. GPM inches) [Pumps nst.
MWCC '50 ~ Smith & Loveless ~ 1978
3 16261 Franklin Trail 180 ~ I<lygt ~ 9.4 3 240 1970
4 3772 Green Heights Trail 100 ~ Hydromatic ~ 3.0 1 230 1974
.
~ 13472 Sycamore Trail 136 12 tHydromatic 1.5 1 230 1974
16 16810 Dewitte Avenue 136 tHydromatic " 1.5 1 1230 1974
~ 15665 Mitchell Circle 1400 b tHydromatic 2 10.0 13 1230 1973
8 15120 Condons Street 126 2 tHydromatic I 1.5 I 30 1973
~ ~286 Lemley Circle 2 " tHydromatic I 1.5 I "30 1973
10 15360 Breezy Point road 180 6 lPeabody-Bames , t7.5 '30 1974
II 15622 Red Oaks Road 180 6 Peabody-Bames , ~.5 230 1974
12 5395 Candy Cove Trail ;3 2 Peabody-Barnes I ~.O I 230 1974
13 294 Candy Cove Trail j2 ~ Peabody-Barnes I 12.0 I r230 1974
14 15420 Forsythe Road 3 ~ Peabody-Barnes I .0 1 ~30 1974
15 j684 Willow Beach Street 3 ~ Hydromatic I 1.5 I ~30 1974
16 15265 Flint Road "50 ~ Peabody-Barnes ~ .5 3 ~30 1974
17 784 150th Street "9 ~ Peabody-Barnes I .0 I 230 1974
18 14856 Estates A venue 400 8 I<airbanks-Morse ~ 0.0 3 040 1975
19 14335 Rutgers Street "00 6 F'lygt ~ .0 3 230 1975
'0 14351 Shady Beach Trail '00 (j ~Iygt ~ 9.4 3 230 1975
'>1 6230 Marian Circle B3 ~ Peabody-Barnes I 1.5 I 1230 1975
az 3014 Fairview Road 140 14 iF'lygt 12 2.0 I 1230 1977
"3 320 I Sunset Trail 020 16 Plygt 12 5.0 B ~30 1977
'4 16943 Lime Road 520 8 1<lygt 12 9.4 B 1230 1977
'5 16560 Northwood Road ~20 8 Flygt 9.4 ~ 1230 1977
06 16040 Northwood Road B30 ~ Flygt 20.0 B 1230 1977
17 4281 Lords Street 165 14 Flygt ., 9.4 ~ 230 1978
29 4200 Quaker Trail ~5 3 Myers 2 0.75 I 230 1978
130 15630 Fremont Avenue 85 tHydromatic 11 13.0 I "30 1987
131 Sterling South @ Wilds 1325 8 Wlygt 0 17.5 13 80 1995
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3.2 InfiltrationlInflow
Infiltration/Inflow is a combination term used to identify clear water which enters the
wastewater collection system. Infiltration is normally related to ground water and it occurs at a
slow rate over an extended period of time. Inflow is associated with precipitation events (rainfall
or snowmelt) and generally results in a peak flow for a relatively short period of time. The
combination term InfiltrationlInflow (III) is used for discussion of the overall problem without
determining or estimating the division of the two types. In many cases, it is difficult to
accurately split the two because defects will act as sources of both infiltration and inflow.
Wastewater flow in Prior Lake is metered by the MCES at their Meter No. 404. The
meter uses a nine-inch Parshall flume as a primary device installed in the 36-inch interceptor line
at the northern boundary of the City. This meter measures and records the flow from the entire
City which includes the SMSC wastewater flow. The City of Prior Lake meters the flow from
the SMSC area and bills the community directly based on the flow records.
MCES wastewater flow records for 1997 and 1998 were reviewed and compared to City
water usage records to evaluate the degree of the III problem in Prior Lake. The MCES flow
records are summarized in Figure 3-3. In 1997, the annual average daily flow rate was 1.55
million gallons per day (MGD), the average flow during winter months (January and February)
was 1.40 MGD, and the peak day flow was 2.88 MGD on July 22, 1997. In 1998, the average
annual daily flow rate was 1.60 MGD, the average flow during winter months (January and
February) was 1.45 MGD and the peak day flow was 3.20 MGD on June 27.
The City's metered water sales records indicate that the average daily water sales during
the first quarter of 1997-1998 were 1.008 MGD. During the first quarter of the year, it is
anticipated that most of the metered water usage would be discharged into the sanitary sewer.
Any exterior, non-sewered use would be minimal. With this assumption, an estimate of the
winter of "base infiltration rate" can be determined by subtracting the water usage from the
wastewater flow with the following result: 1997 - estimated year around infiltration 0.39 MGD
(1.40 MGD - 1.01 MGD). 1998 - estimated year around infiltration 0.44 MGD (1.45 MGD -
1.01 MGD). The average annual III was 0.54 MGD and 0.59 MGD for 1997 and 1998,
respectively.
During the summer months, infiltration will increase due to higher ground water levels
and the "inflow" impact of rainfall events is evident. The 1997-98 average daily flow during the
spring/summer months of March through September was 1.69 MGD. Subtraction of the average
"expected wastewater" flow (winter quarter water usage) of 1.01 MGD results in an estimated
0.68 MGD summer III.
The inflow in the system can be estimated by subtracting the average flow from the peak
day flow records. In 1997, the peak day flow was 2.88 MGD and in 1998 the peak flow was 3.20
MGD. The average summer wastewater flow was 1.69 MGD so the inflow contributes
approximately 1.35 MGD of flow on the peak days (1.19 -1.51 MGD).
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Inflow generally occurs for a shott period of time and creates problems because of the
high flow rate which must be conveyed in the collection system. The main concern with inflow
is the peak rate, not the volume. In contrast, infiltration is primarily a volume problem because it
occurs for an extended period oftime at a relatively low rate.
lFigure 3-3 - MCES Flow Records
!Precipitation ~astewater Flow (MGD) ~omments
!Month
Recorded \Normal rrotal lA verage \Maximum Minimum
MG) lDay lDay Day
lJanuary 1997 0.98 .066 3.0 1.39 1.39 1.39 !Meter Problem
February ~.62 39.7 1.42 1.59 1.28
March p.16 1.57 ~9.6 1.60 1.99 1.35
iA pril 1.15 ~.37 ~4.2 1.81 12.46 1.51
lMay ~.66 ~.30 5.1 1.45 1.68 1.39
~une 3.13 ~.18 45.4 1.51 1.88 1.40
~uly 8.43 B.66 ~5.9 1.80 1?88 1.48
iAugust 7.06 13.89 153.0 1.71 ~.05 1.53
~eptember ?75 ~.95 ~7.4 1.58 1.93 1.43
October 1.61 ".22 ~4.2 1.43 1.61 1.36
November p.12 1.34 43.2 1.44 1.66 1.31
pecember ~.81 143.4 1.40 1.51 1.29
:r otal ~8.10+ ~7.57 564.1
iAnnual Average 1.55
anuary 1998 0.99 0.66 44.0 1.42 1.55 1.28
February P.46 0.62 141.5 1.48 1.62 1.36
March .26 1.57 ~7.9 1.55 12.06 1.37
iApril 5.75 12.37 p2.6 1.35 ~30 1.54
!May 5.39 3.30 150.1 1.62 1.75 1.51
~une 19.13 4.18 p1.3 1.71 3.20 1.52
uly .27 13.66 158.2 1.88 2.38 1.63
August 5.22 13.89 50.8 1.64 1.82 1.51
Iseptember 1?30 12.95 5.7 1.52 1.67 1.43
October ~.33 12.22 45.7 1.47 1.63 1.39
November 1.44 1.34 144.8 1.49 1.66 1.38
December ~.81 144.9 1.45 1.60 1.35
ffotal ~9.09 + ~7.57 577.5
Annual Average 1.58
1) Precipitation at Jordan, NOAA Recording Station
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Based on the review of the 1997 and 1998 records, the infiltration/inflow situation in the
City of Prior Lake can be summarized in Figure 3-4.
igure 3-4 -1997-98 1/1 Flows
1997 Metered Wastewater Flow
1997 Base Infiltration Flow
1997 Annual III Flow
1997 Peak Inflow Rate
1998 Metered Wastewater Flow (through November)
1998 Base Infiltration Flow (through November)
1998 Annual III Flow (through November)
1998 Peak Inflow Rate (through November)
otal (MG)
564.1
142.4
195.5
.88
532.6
147.0
195.3
3.20
Dail
1.60
.44
.59
In 1997, 25% of the total wastewater flow was "base" infiltration, and in 1998, the base
infiltration increased to about 28% of the total flow. During the summer months, the III
contributed about 45% of the total flow. On the peak day, the calculated inflow was about 47%
of the total daily flow. Both 1997 and 1998 were above average rainfall years, so it is anticipated
that the ground water was relatively high, which would be a contributing factor to the observed
high infiltration rates.
In April 1992, the MCES published the results of a system-wide Infiltration/Inflow
Analysis which identified Prior Lake as a community with near average III flow rates. In this
analysis, consideration was given for the high ground water conditions in the City. Therefore,
although the infiltration volume appears high, when compared to other communities with high
ground water, the infiltration rate was not considered severe according to the MCES. However,
in consideration of the high cost of treating wastewater, the infiltration rate is a concern for the
City of Prior Lake. This type of problem is generally difficult to identify and rehabilitate, but it
is important to keep working on the problem.
The City will continue efforts to identify and remove infiltration through internal
inspection (televising) and rehabilitation after identification of problems. Since the problem
appears to be relatively continuous, the inspection work could be completed at almost any time
of the year. The City has undertaken a sump pump inspection program to identify and remove
direct sump pump connections to the sanitary sewer. A reduction in the number of sump pump
discharges should directly reduce the inflow in the system. In addition, the City staff is
compiling all of the data currently in the files in an attempt to isolate potential clear water source
areas.
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SECTION 4 PLANNING AND LAND USE
4.1 General
Wastewater collection and treatment needs are dictated by the land use, population
density, and the planning period for the study area. Each new connection to the system adds to
the wastewater flow in the sanitary sewer system. Land use and population densities have been
developed and discussed in the City's overall comprehensive plan. This information will be
utilized in conjunction with the planning periods defined here to analyze the City's wastewater
system.
4.2 Planning Period
The planning period for municipal engineering projects generally coincides with the
useful life of the particular utility system. Under normal use conditions, mechanical equipment
such as lift station pumps is expected to last about 20 years with good maintenance.
Underground structural components like collection system pipes are typically designed for 50
years of service.
For this update, the MCES has requested that the year 2020 be used for the planning
period. In order to consider the "worst case", the analysis will include a projection of the
ultimate development of the City of Prior Lake including all of the current City limits and the
"orderly annexation area" that may develop at some time.
4.3 Land Use
The City of Prior Lake Land Use Plan is presented and discussed in the "Land Use"
section of the comprehensive plan. Basic data from the City's Land Use Plan will be used for
projecting the future wastewater needs of the City.
The current MUSA is entirely within the City limits but it does not include all of the land
within the City limits. Development of land within the MUSA requires the extension of
municipal sanitary sewer services. Land outside the MUSA cannot be connected to the
municipal sewer system and must be developed with larger individual lots to accommodate
onsite wastewater treatment. As the land inside the current MUSA is developed, there will be
interest in expanding the MUSA to include additional land within the current City limits and
possibly, the orderly annexation area.
Since it is difficult to anticipate exactly which parcels of land will develop first, the City
is requesting that an "undesignated MUSA" be considered for the defined area within the City
limits and the orderly annexation area. The documentation required by the MCES for the
undesignated MUSA is included in the Land Use section of the comprehensive plan.
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t:t
SECTION 5 POPULATION
The City of Prior Lake has experienced a significant population growth since 1960 and
the trend is anticipated to continue for the foreseeable future.
The MCES population projections for the City of Prior Lake are summarized in Figure 5-
1. The City planning projections generally agree with the MCES projections.
Fi ure 5-1- MCES Pro'ection of Po ulation for the Ci of Prior Lake
Ultimate
1996 2000 2010 2020 Develo ment
Households 4,669 5,400 8,000 11,000
Population 13,519 15,300 21,300 27,400 30,400
Employment 6,439 7,200 9,690 10,200
The majority of the population growth is anticipated to occur within the current and
future MUSA. The entire population will be considered for projection of wastewater flows and
the analysis ofthe wastewater collection system.
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SECTION 6 WASTEWATER FLOWS
The III analysis in Section 3 established an average daily water use of about 70 gallons
per capita per day, based on metered water usage records. A comparison of the metered water
usage and wastewater flow records (Figure 3-3) results in an average annual infiltration/inflow
fate of 0.56 mgd, and a peak month rate of 0.87 mgd.
Wastewater flow records from 1997 and 1998 indicate an annual average daily flow rate
of about 1.57 mgd. Using an estimated service population of 14,400 persons during the period
results in a per capita wastewater rate of 109 gpd.
The MCES projected anticipated future wastewater flow from the City of Prior Lake is
summarized in Figure 6-1.
Fie:ure 6-1 - MCES Pro1ection of Wastewater Flows for the City of Prior Lake
2000 2010 2020
Low High Low High Low High
Annual Flow (million gallons) 590 685 838 1,011 1,079 1,331
Average Daily Flow (mgd) 1.62 1.88 2.30 2.77 2.96 3.65
Projected Population 15,300 21,300 27,400
Calculated gpcd. 106 - 123 108 - 130 108 - 133
The wastewater generation rate of 109 gpcd calculated from the 1997-1998 records
compares favorably with the rates projected by the MCES.
Assuming water usage rates and infiltration/inflow rates continue as determined in 1997-
98, the projected future rates can be calculated as shown in Figure 6-2.
Figure 6-2 - Projected Future Wastewater Flows
1997 000 010
opulation 14,400 15,300 21,300
ase wastewater flow 1.008 mgd 1.071 mgd 1.491 mgd 1.918 mgd 2.128 mgd
at 70 gpcd)
nnual average 1/1 0.562 mgd 0.600 mgd 0.831 mgd 1.069 mgd 1.186 mgd
at 39 gpcd.)
eak monthly 1/1 0.806 mgd 0.857 mgd 1.278 mgd 1.644 mgd 1.824 mgd
at 60 gpcd.)
verage Daily Flow (mgd) 1.57 mgd 1.67 mgd 2.32 mgd 2.99 mgd 3.31 mgd
eak Month Flow (mgd) 1.87 mgd 1.99 mdg 2.77 mgd 3.56 mgd 3.95 mgd
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SECTION 7 COLLECTION SYSTEM ANALYSIS
The existing wastewater collection system is shown on Figure 7-1 in the Appendix. A
computer "model" of this collection system was used to analyze the capabilities and identify
possible deficiencies in the system. The Eagle Point computer model utilized in this analysis
simulates the operation of the collection system and lift stations under various flow conditions.
The basic system parameters of pipe size, invert elevation, and pumping capacity are input into
the model, along with variable parameters representing the projected flow. The software uses the
input parameters to calculate the capacity of the individual pipes and the flow rate required to be
carried by the pipe based on the tributary area and the rate of wastewater generation. The input
data and the summary report from the model are included in Appendix B.
The Prior Lake model was simplified somewhat by using long pipe segments that may
include several manhole stretches between some junction points in the model. The basic line
network is shown in Figure 7-2 in the Appendix. This reduces the overall number of lines in the
model and will have some affect on the "calculated" capacity of an individual line since the
calculation is based on the slope of the segment which in turn is based on the length of the line.
In bypassing some manholes, the length of the line in the calculation will be less than the sum of
the lengths between the two junction nodes, so the slope will appear greater and the calculated
capacity will be slightly overstated. In most cases, this limitation is not significant since the pipe
length differential is less than 10%. In cases where the calculated pipe capacity is relatively
close to the projected flow capacity required, the pipe capacity is re-evaluated using "scaled"
pipe lengths to verify that sufficient capacity is available.
Flow rate data for the model is input based on the tributary area of the particular sewer
segment. In order to input the flow data, the per capita usage rates must be converted to a flow
per unit area (acre) and the infiltration rate must be converted to a flow per mile of pipe.
In single-family residential areas, the average daily base wastewater flow rate for
"modeling" purposes is 460 gallons per acre per day. This is based on a unit density of 2.3 units
per acre, 2.8 people per unit and a 70 gpcd average water usage.
Wastewater flow from multi-family residential areas was projected at 730 gpd/ac. based
on 4.0 units per acre, 2.6 people per unit and 70 gpcd.
The average daily flow from commercial and industrial areas was estimated at 1,000 gpd
per acre. There are no large commercial or industrial water users in the City of Prior Lake.
The SMSC and the city areas south and west on CSAH 82 are currently served or will be
served by the 12-inch interceptor line planned by the SMSC. The line is sized to convey both the
projected flow from the SMSC and the potential development area of the city.
Infiltration/inflow was input into the "model" by calculation of a fixed rate per mile of
pipe in the analysis based on the III rate projected in the preceding figure. The computer model
includes a total of about 20.5 miles of the Prior Lake Sanitary Sewer System.
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The average infiltration rate for analysis purposes is calculated in the following table:
Calculation Year
2000
2010
2020
Ultimate
Projected Maximum
Monthl Infiltration
0.918 mgd
1.278 mgd
1.644 mgd
1.824 mgd
Infiltration
"Model"
d1mi.
44,800
62,300
80,200
89,000
Rate for
Calculation
The "model" of the sanitary sewer system was run using the operating parameters of the
worst case scenario summarized in the following table.
Ultimate Service Population
Average Wastewater Generation Rate
Single-Family Residential Areas
Multi-Family Residential Areas
Commercial Industrial Areas
Wastewater Peaking Factor (peak hour)
Infiltration/Inflow Rate
30,400
persons
450
730
1,000
gpdlac
gpdlac
gpdlac
3.5 times average
89,000
gpdlmi
The sanitary sewer model with the "worst case" operating scenario indicates that the
gravity sewer lines are adequate but the MCES lift station and Prior Lake Lift Stations 25 and 26
will need additional capacity in the future.
In order to establish when the proposed improvements may be necessary, the City area
was divided into 30 sanitary sewer districts for analysis. The projected flow from each small
service area was subdivided into five-year increments from the year 2000 to 2020. A schematic
diagram of the 30 sub-areas is provided in Figure 7-3. The projected flows in five-year
increments for each area within the City are listed in Figure 7-4. Figure 7-5 provides the same
five-year data for the MCES system located within the City system.
The MCES lift station provides service to sub-area 17. According to the development
projections and wastewater generation rates, the MCES lift station capacity will be exceeded
sometime before 2005. During peak hour conditions, the pumping capacity should be increased
to about 720 gpm in order to handle the projected ultimate design flow in the service area.
City Lift Stations 24 and 25 will reach their capacity in about 20 years. Since there
appears to be a significant number of years until the station capacity is reached, it would be
appropriate to re-evaluate the situation as development within the service area actually occurs.
Comprehensive Plan 2020
Chapter 7
Page 13
Figure 7-4 - Incremental Flow Projection by Sanitary Sewer Service District
City of Prior Lake
12..Jan-99
2000 2005 2010 2015 2020 Ultimate Comments
Flow Area Cumulative Area Cumulative Area Cumulative Area Cumulative Area Cumulative Area Cumulative
District Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow
(1,000 gpd) (1,000 gpd) (1,000 gpd) (1,000 gpd) (1,000 gpd) (1,000 gpd) (1,000 gpd) (1.000 gpd) (1,000 gpd) (1,000 gpd) (1,000 gpd) (1,000 gpd)
30 15 15 23 23 31 31 39 39 46 46 124 124 Flows into 27
29 8 8 17 17 26 26 31 31 36 36 104 104 Flows into 27
28 11 11 14 14 17 17 19 19 20 20 28 28 Flows into 27
27 5 39 6 60 6 80 7 96 7 109 7 263 Includes 30,29.28
26 124 124 132 132 139 139 147 147 155 155 155 155 Flows into 25
25 5 129 9 141 13 152 16 163 19 174 64 219 Incl 26, flows into 24
24 67 235 71 272 75 307 79 338 83 366 83 565 Incl 25-30, flows into 13
23 34 34 36 36 38 38 40 40 42 42 42 42 Flows into 22
22 98 132 105 141 111 149 117 157 123 165 123 165 Incl 23, flows into 21
21 117 249 124 265 131 280 139 296 146 311 146 311 Incl 23 & 22, flows into 19
20 8 8 9 9 9 9 10 10 10 10 10 10 Flows into 19
19 161 418 161 435 161 450 161 467 161 482 161 482 Incl 20-23. flows into 15
18 81 81 86 86 91 91 96 96 101 101 101 101 Flows into 15
17 60 60 110 110 159 159 197 197 235 235 294 294 Flows into 15
16 64 64 68 68 72 72 76 76 80 80 80 80 Flows into 15
15 95 718 95 794 95 867 95 931 95 993 95 1052 Includes 16-23. flows into 13
14 109 109 125 125 140 140 164 164 187 187 311 311 Flows into 13
13 35 1097 35 1226 35 1349 35 1468 35 1581 35 1963 Inc114-30, flows into 12
12 66 1163 66 1292 66 1415 66 1534 66 1647 66 2029 Incl 13-30. flows into 7
11 0 0 0 0 0 0 0 0 0 0 126 126 Flows into 9
10 0 0 5 5 10 10 34 34 57 57 95 95 Flows into 9
9 0 0 33 38 65 75 81 115 97 154 108 329 Incl 10-11, flows into 7
8 84 84 122 122 159 159 159 159 159 159 159 159 Flows into 7
7 75 1322 85 1537 94 1743 94 1902 94 2054 94 2611 Incl 8-30, flows into 5
6 33 33 35 35 37 37 39 39 41 41 41 41 Flows into 5
5 276 1631 296 1868 315 2095 330 2271 345 2440 345 2997 Incl 6-30, flows into 3
4 0 0 36 36 71 71 178 178 284 284 355 355 Flows into 3
3 0 1631 49 1953 98 2264 128 2577 157 2881 196 3548 Incl 4-30, flows into 2
2 0 1631 45 1998 90 2354 117 2694 144 3025 180 3728 Incl 3-30, flows into 1
1 0 1631 15 2013 29 2383 72 2766 115 3140 144 3872 Incl 2-30, flows into MCES
Page 14
Comprehensive Plan 2020
Chapter 7
Figure 7-5 - Incremental Flow Projection - MCES System in Prior Lake
.,...
.-.I
iCity of Prior Lake
~2-Jan-99
ale 000 005 ?010 ~015 12020 ~Itimate Development
bistriet aoacitv umulative Gumulative umulative lIumulative L;umulative Cumulative Cumulative Cumulative umulative umulative Cumulative umulative
gpm) low low low low low IFlow Flow low low low low low
1,000 gpd) gpm) 1.000 gpd) gpm) 1.000 gpd) gpm) 1,000 gpd) gpm) 1,000 gpd) gpm) 1,000 gpd) gpm)
Annual Average Daily Flow
17 50 60 42 110 76 159 110 197 137 235 163 294 204
15 ,440 718 499 794 551 867 602 931 647 993 690 1,052 731
13 .745 1.097 762 1,226 851 1,349 937 1.468 1.019 1,581 1,098 1.963 1.363
12 ,370 1.163 808 1,292 897 1.415 983 1,534 1,065 1,647 1,144 ,029 1,409
.450 1,322 918 1,537 1,067 1,743 1,210 1.902 1,321 .054 1,426 .611 1,813
,870 1.631 1,133 1.868 1,297 ,095 1.455 ,271 1,577 ,440 1.694 ,997 ,081
3,520 1,631 1,133 1,953 1,356 ,264 1,572 ,577 1,790 ,881 .001 ,548 .464
19,750 1.631 1,133 1,998 1,388 ,354 1.635 ,694 1.871 .025 ,101 .728 .589
1 4,460 1.631 1,133 ,013 1,398 ,383 1.655 ,766 1,921 .140 .181 ,872 .689
~eak Day Flow (2 times ADF) 12.0
17 50 120 83 220 153 318 221 394 274 470 326 588 408
15 ,440 1,436 997 1,588 1.103 1,734 1.204 1,862 1,293 1,986 1.379 ,104 1,461
13 ,745 .194 1,524 ,452 1.703 .698 1,874 .936 ,039 ,162 .196 ,926 .726
12 .370 ,326 1,615 .584 1,794 ,830 1,965 .068 ,131 ,294 ,288 .058 ,818
,450 ,644 1,836 ,074 ,135 .486 ,421 ,804 ,642 ,108 ,853 .222 ,626
,870 .262 ,265 ,736 .594 ,190 .910 ,542 ,154 ,880 ,389 .994 ,163
3,520 ,262 .265 ,906 ,713 ,528 ,144 ,154 .579 ,762 ,001 ,096 ,928
19.750 .262 ,265 ,996 .775 .708 ,269 .388 ,742 .050 .201 ,456 ,178
1 34,460 .262 .265 ,026 ,796 ,766 ,310 ,532 ,842 ,280 ,361 .744 ,378
Peak Hour Flow (3.5 times ADF) 3.5
17 50 210 146 385 267 557 386 690 479 823 571 1,029 715
15 ,440 ,513 1,745 ,779 1,930 ,035 ,107 ,259 ,263 ,476 ,414 ,682 .557
13 ,745 .840 ,666 ,291 ,980 ,722 ,279 ,138 ,568 ,534 ,843 ,871 ,771
12 .370 ,071 .827 .522 .140 .953 ,439 ,369 ,728 ,765 ,003 ,102 .932
,450 .627 ,213 ,380 ,736 ,101 ,236 .657 .623 ,189 ,992 ,139 ,346
.870 ,709 ,964 ,538 .540 .333 ,092 ,949 ,520 ,540 .931 10,490 ,284
3,520 .709 ,964 ,836 ,747 ,924 ,503 .020 ,264 10,084 ,002 12,418 ,624
19.750 .709 ,964 ,993 .856 ,239 ,722 ,429 .548 10,588 ,352 13,048 ,061
1 34,460 ,709 .964 ,046 ,893 ,341 ,792 ,681 .723 10,990 .632 13,552 .411
Page 15
'" , Comprehensive Plan 2020
'! Chapter 7
SECTION 8 CONCLUSIONS AND RECOMMENDATIONS
The sanitary sewer model indicates that the gravity collection system is adequate for the
projected "worst case" flow rates and the lift station capacities are generally adequate. However,
the analysis necessarily uses a calculated pipe capacity which assumes a "clean" pipe capacity
within uniform grade. None of these assumptions are completely true in actual field conditions.
Although the overall system appears to be adequate for the anticipated future growth, City staff
will continue routine monitoring in order to identify localized problems. In addition, there are 26
City lift stations that are 20 years old or older. The city has implemented a lift station renovation
program which is currently included in the five year CIP.
The City will continue the routine preventive maintenance program that they have been
using successfully for a number of years, as well as continuing the lift station renovation
program.
Comprehensive Plan 2020
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SECTION 9 ON-SITE SEW AGE DISPOSAL SYSTEM MANAGEMENT
The Metropolitan Council requires that the City develop a plan for the management of
on-site sewage disposal systems. These systems are private septic treatment systems on
individual lots. In the City of Prior Lake, these systems are located on agricultural parcels, and
in older subdivisions where sewer service is not available. There are also on-site septic systems
serving the seasonal cabins on Twin Island in Prior Lake.
The City has developed an inventory of the existing systems. There are approximately
180 existing systems located in the City of Prior Lake. Since this is a relatively small number of
systems, the City is working with Scott County to develop an agreement for the ongoing
inspections of the systems. It is anticipated that the City will continue to issue permits for the
one or two new systems installed each year. Once the permits are issued, and final inspections
are completed, Scott County will take over the maintenance program.
Comprehensive Plan 2020
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Appendix A - Maps
Comprehensive Plan 2020
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Figure 7-1 - Existing Sewer System
Comprehensive Plan 2020
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Figure 7-2 - Line Diagram for Sewer Model
Comprehensive Plan 2020
Chapter 7
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Figure 7-3 - Sanitary Sewer Flow Districts
Comprehensive Plan 2020
Chapter 7
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.~. .~7f~ -~ ~
.....-
Ii .'
Appendix B - Eagle Point Sewer Model
Comprehensive Plan 2020
Chapter 7
Page 22
CHAPTER8 WATERSUPPLY
TABLE OF CONTENTS
SECTION I INTRODUCTION
1.1 SCOPE OF STUDy...... ................ ........................ ................................... ............. ...........293
1.2 STUDY TIME FRAME ............. .......... ........................... .............. .......... ........ ...... .......... 294
1.3 STUDY LIMITATIONS ..". ............. ........... ............. .......... ..... ............ ..". ....................... 294
1.3.1 Watermain Siting....... .............. ....... ............. ................. .................. ....... ..............294
1.3.2 Storage Reservoirs and Pumping Facilities ........................................................294
1.4 AUTHORITY ..................................................................................................................294
1.5 COOPERATION AND ACKNOWLEDGMENTS ....................................................... 295
SECTION 2 EXISTING WATER SYSTEM
2.1 GENERAL....................................................................................................................... 296
2.2 WATER SUPPLy............. ............. .... ............... ...... ................... ...... .... ......... ..................298
2.3 WATER STORAGE......... .............. ......................... ........... .................. .......... ...... ...... ..... 299
2.4 DISTRIBUTION SYSTEM ........... ... .... ........... ...... ............. .................. .......................... 299
2.5 TREATMENT... ............... ............. ......... .......... ............... ............ ...... .... ........ ........ ..........299
SECTION 3 POPULATION GROWTH AND LAND USE
3.1 GENERAL....................................................................................................................... 300
3.2 PLANNING PERIOD...................................................................................................... 300
3.3 LAND USE PLANNING ............. .................... ..... ............................... ......... ...... ....... ....300
3 .4 POPULATION... ........... ................. .... ........... ..... ...... .............................. ........ ........ ..... .....301
3.5 PAST WATER USAGE RECORDS .............................................................................. 302
3.6 UNACCOUNTED-FOR WATER USE ......................................................................... 306
3.7 FUTURE WATER USE PROJECTIONS ......................................................................309
3.8 FIRE PROTECTION ........... ................ ................. ................... ....... ..... ........ ....... ...... .......310
SECTION 4 PRODUCTION, STORAGE, DISTRIBUTION AND TREATMENT
4.1 GENERAL ....... ................. .................. ....... ......... ....... .... ........................ ........ ....... ........... 313
4.2 SUPPLY........ ..................... .............. .................... .................. .......... ..... ......... ........". .......313
4.2.1 Alternate Water Sources ...... .... ............ ................ ...... ............. ........ ............. ........ 313
4.2.2 Water Supply Requirements...... ........... ............................ ............ ........ ...............314
4.2.3 Future Well Locations..... ...... .... ................ ....................... ..... ...... ......... ..... .......... 315
4 .3 STORAGE....................................................................................................................... 315
4.3.1 Storage Requirements.......................................................................................... 315
4.4 WATER TREATMENT ..................................................................................................320
4.4.1 Current Treatment Method. ........... ...................... ...................... ........ ..." ........ .....320
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4.4.2 Proposed Water Treatment Method .................................................................... 320
4.4.3 Oxidation ........... ................................. ................................. ................ ...... ..........321
4.4.4 Filters................................................................................................................... 322
4.4.5 Filter Backwash ............................ ............. ................... .......... ...... ........ .......... .....322
4.4.6 Backwash Water Reclamation..... ............. ............... ....... ................. ....... .............323
4.4.7 Chemical Feed Systems.......................................... .................. ......... ...... ............ 323
4.4.8 System Operation and Maintenance.................. ................................ .................. 324
4.4.9 Water Treatment Plant Construction........................................... ........................ 324
4.5 D ISTRIBUTI ON SySTEM............................................................................................ 326
4.5.1 Distribution System Requirements .....................................................................326
4.5.2 CYBERNET Computer Model........................................................................... 326
4.5.3 Existing Distribution System Improvements ...................................................... 327
4.6 CAPITAL IMPROVEMENT PLAN (CIP) .................................................................... 328
4.6.1 Five Year CIP ...................................................................................................... 328
4.6.2 Twenty Year CIP ................................................................................................. 329
4.7 CAPITAL IMPROVEMENT PLAN COST ESTIMATES ...........................................330
SECTION 5 WATER QUALITY
5.1 GENERAL....................................................................................................................... 335
5.2 SAFE DRINKING WATER ACT (SDW A) .................................................................. 335
5.2.1 General................................................................................................................. 335
5.2.2 Primary Drinking Water Standards ..................................................................... 337
5.2.3 Secondary Drinking Water Standards ................................................................. 337
5.2.4 Fluoride................................................................................................................ 337
5.2.5 Volatile Organic Chemicals (Phase I) ................................................................. 337
5.2.6 Surface Water Treatment Rule ............................................................................ 337
5.2.7 Total Coliform Rule......................................................................... ....................338
5.2.8 Lead and Copper Rule.. ......................................... .............................................. 338
5.2.9 Phase II SOCs and IOCs...................................................................................... 338
5.2.10 Radionuclides ..................................... ............... ........................................... .......338
5.2.11 Disinfectants/Disinfection Byproducts Rule (Phase VIa) ..................................339
5.2.12 Phase V SOCs and IOCs ..................................................................................... 339
5.2.13 Arsenic.................................................... ............................................................. 339
5.2.14 Sulfate Rule...................... ............................................................... .....................339
5.2.15 Groundwater Disinfection Rule................................................ ........ ...................340
5.2.16 Future Regulations (Phase VIb) .......................................................................... 340
5 .3 WATER QUALITy.................................................................. ....................................... 340
5.3 .1 Primary Drinking Water Standards..................................................................... 341
5.3.2 Secondary Drinking Water Standards ................................................................. 341
5.3.3 Fluoride....................................................................... .........................................342
5.3 .4 Volatile Organic Chemicals ................................................................................ 343
5.3.5 Coliform........................................................................ ....................................... 343
5.3.6 Lead and Copper........................................................ .......................................... 343
5.3.7 Phase II SOCs and Ioes.......................... ......................... ......... ......... .................343
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5.3.8 Radionuclides .... .................... ........... ..... .... ......... ..... .... ......... ......... .......... ....... .....343
5.3.9 DisinfectionlDisinfection Byproducts.... ....... ............................... ...... ....... .......... 344
5.3.10 Phase V SOCs and IOCs ............................. ................................. ......... ........ ......344
5 .4 SUMMARy..................................................................................................................... 344
SECTION 6 _ EMERGENCY PLAN FOR PUBLIC WATER SYSTEM
6.1 INTRODUCTION ........................................................................................................... 345
6.2 EMERGENCY PHONE LIST ...... ........................ .............................. ...... ............. ..... ....345
6.3 CURRENT WATER SOURCES AND SERVICE AREA............................................ 346
6.4 PROCEDURE FOR AUGMENTING WATER SUPPLIES ......................................... 346
6.4.1 Interconnect with Adjacent Communities........................................................... 346
6.4.2 Conjunctive Use of Surface and Groundwaters.................................................. 347
6.4.3 Alternative Sources of Water.. .................. .......... ................... .................... ......... 348
6.5 DEMAND REDUCTION MEASURES .................... ...... ......................... ............ .......... 349
6.5.1 Demand Reduction Potential......................... .............................. .......... .......... ....349
6.5.2 Short Term Demand Reduction Procedures .......................................................349
6.6 PROCEDURES FOR WATER ALLOCATION ............................................................ 350
6.7 TRIGGERS FOR IMPLEMENTING PLAN COMPONENTS..................................... 351
6.8 ENFORCEMENT ...... ...................... .......... ................... ................. ..... .... .............. ..... ...... 351
6.9 WATER SUPPLY PROTECTION .................................................................................352
6.9.1 Analysis of Previous Supply Problems ...............................................................352
6.9.2 Wellhead Protection ..... .... .......... ...................................... .......... .............. ...........352
6.9.3 Resource Monitoring...... ............. ..................... ................. ..................................352
SECTION 7 - WATER CONSERVATION PLAN
7.1 INTRODUCTION.. ............. .................................... ...... ............................ ............. .........355
7.2 ROLE OF CONSERVATION ................................ ......... ........................ .............. .... .....355
7 .3 WATER CONSERVATION POTENTIAL ................................................................... 355
7 .4 WATER CONSERVATION PROGRAMS ................................................................... 355
7.4.1 Metering ...... ............ ............... ................. ............. ..................... ......... .................. 356
7.4.2 Water Audits, Leak Detection, and Repair ......................................................... 356
7.4.3 Conservation-Oriented Water Rates............... ....... .......... ............ ............. ...........356
7.4.4 Regulation............................................................................................................ 357
7.4.5 Education and Information Program...... ............. ................... ...... ............... ........ 357
7.4.6 Retrofitting Programs.......................................................................................... 358
7.4.7 Pressure Reduction ........... ............................... ................. ......... .............. ............ 360
SECTION 8 WATER RATE AND TRUNK CHARGE REVIEW
8.1 WATER RATES.............................................................................................................. 361
8.1.1 General....... ...... ........... ......... ........................................................ ........................ 361
8.1.2 Existing Cost Recovery System .......................................................................... 361
8.1.3 Recommendation for Future Water Rates........................................................... 362
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8.2 TRUNK CHARGE SYSTEM .........................................................................................364
8.2.1 Current Method of Financing Trunk Charges..................................................... 364
8.2.2 Future Trunk Charge Recommendations ............................................................ 364
8.2.3 Future Trunk Main Costs .................................................................................... 364
SECTION 9 HYDRANT FLUSHING PROGRAM
9.1 GENERAL .......................................................................................................................366
9.2 CURRENT FLUSHING PROGRAM......................................................... ..... ...... .........366
9.3 PROPOSED FLUSHING PROGRAM...........................................................................367
9.4 RECOMMENDA TI ONS................................................................................................. 368
Comprehensive Plan 2020
Chapter 8
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CHAPTER 8
WATER SUPPLY
SECTION 1
INTRODUCTION
1.1 SCOPE OF STUDY
This report presents the findings of the water system comprehensive planning study for the
City of Prior Lake. The study included analyses of the following items:
1. Determination of future water demands based on present water demands and anticipated
future residential, commercial, and industrial growth in the City.
2. Determination of the capability of the existing water source (wells) to satisfy present
and future water demands.
3. Determination of the capability of the existing storage facilities to supply water for
periods of peak consumption as well as fire protection.
4. Determination ofthe capability of the existing distribution system to deliver the present
and future water demands and fire flow to the point of use.
Other elements of the water comprehensive plan included:
1. Analysis of population growth as well as commercial and industrial development in the
City.
2. Evaluation of future distribution system improvements with the assistance of a
CYBERNET computer model.
3. Development of an improvement program to alleviate present deficiencies in the water
system and to provide the capability to satisfy future water demands.
4. Analysis of potential water conservation measures that could be implemented to reduce
peak demands.
5. Analysis of water quality characteristics 10 the City and companson to current
government (EP A) regulations.
Comprehensive Plan 2020
Chapter 8
Page 293
A Comprehensive Water Plan is an important tool for providing an effective and efficient
system for meeting a community's water needs. The City of Prior Lake had an initial
Comprehensive Water Study completed in 1979 and completed a subsequent Water System Report
in 1987. Both of these documents have provided guidance in the development of existing facilities
and backgrOtUld information for this planning effort. In 1995, the Comprehensive Water Supply
Plan was again updated to reflect existing conditions and project planning through the year 2015.
In recent years, the City of Prior Lake has experienced a rapid increase in population. Extensive
planning has been undertaken to address the projected needs. This report is an update of the 1995
planning report and incorporates the additional planning data currently available.
1.2 STUDY TIME FRAME
This study charts the City's growth and water system needs to the ultimate condition. The
study period was further broken down for the purpose of analysis. The key years are 2005, 2010,
2015, and 2020.
1.3 STUDY LIMITATIONS
1.3.1 Watermain Siting
Specific siting of the watermains recommended for construction in this report is left to the
designers. Such siting is beyond the scope of this study; however, a general guidance for siting will
be provided.
1.3.2 Storage Reservoirs and Pumping Facilities
The system's water storage capacity will be evaluated quantitatively. Evaluation of
structural integrity and the coating of these reservoirs is not within the scope of this study.
Furthermore, this study does not address the mechanical condition of the pumping facilities located
at Wells No.3, 4, and 5.
1.4 AUTHORITY
The water system in the City of Prior Lake is operated and administered by the Department
of Public Works, City of Prior Lake.
This study was authorized by the City of Prior Lake.
Comprehensive Plan 2020
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1.5 STUDY UPDATE
This study was updated by the City of Prior Lake's Engineering Department in 1999 to
conform with the 1999 Comprehensive Plan.
Comprehensive Plan 2020
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SECTION 2 EXISTING WATER SYSTEM
2.1 GENERAL
The City of Prior Lake's existing water system consists of three wells, two elevated
reservoirs, a booster pumping station, and distribution watermain varying in size from 6-inch to 24-
inch. There is an interconnection with the City of Savage at C.S.A.H. 42 and Boone Avenue that is
a potential source of water for Prior Lake in the case of an emergency. Currently there are only two
pressure zones due to the minor variation in topography of the areas that receive City water.
Although the variation of the topography of the areas currently served with City water is minor,
there are considerable topography changes in other areas throughout the City. USGS maps reveal
that elevations range from 797 feet on the north side of the City to 1,048 feet in "The Wilds"
subdivision.
The existing water system is shown on Exhibit 2-1. The water system map shows the
location of wells, reservoirs, and watermains.
Comprehensive Plan 2020
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;0
EXHIBIT 2-1 EXISTING WATER SYSTEM
Comprehensive Plan 2020
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2.2 WATER SUPPLY
The City obtains all of its water from groundwater wells. Table 2-1 is a tabulation of the
various aspects of each well.
./ ....< ...... .....<.<< )<< ......./. ........ -// ....... ..............
// ..............</ <...... ....... ..... ....... // d...
..... ...... ..... i /< Vt !II ...... .......</i< ............<
................./ ...... ....... .......................... C"'." ......... '.'d ..... ........ ....... ............
...<................../.... d.<< 1< --a<< .......... ...........i4<. li< ,,</<
/i N'~. "./< // ......... .. ......<< // ................///<. .. .............
Unique Well No. 207308 110452 420954
Year installed 1973 1975 1988
Driller Bergerson-Caswell Layne Layne
Outer Casing Diameter (in) 24 24 30
Outer Casing Depth (ft) 124 113 58
Inner Casing Diameter(s) (in) 16 16 24 and 18
Length of inner casing(s) (ft) 268 264 148 and 290
Total Well Depth 364 345 372
Aquifer Jordan Sandstone Jordan Sandstone Jordan Sandstone
Pump Type Vertical Turbine Vertical Turbine Vertical Turbine
Static Level (ft) 45 34 68
Pump capacity 1200 1100 1000
Total Dynamic Head (ft)(I) 320 250 297
(I) NOTE: Total Dynamic Head values were obtained from the 1987 Water System Report. Since
Well Nos. 3 and 4 are in the same aquifer and very close to each other, the value for Well No.4
appears to be too low.
Drilling logs for each well were obtained from the Minnesota Geological Survey (MGS)
and are included in Appendix J.
Well No.3 is located at 16341 Summer Street. Well No.4 is located at 16343 Summer
Street. Well No.5 is located at 5500 Bounty Street.
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2.3 WATER STORAGE
The City has two reservoirs both of which are elevated tanks. Tower No. 1 is located off
Tower Street east of Toronto Avenue. Tower No.2 is located on the north side of the City near
C.S.A.H. 42 at Crest Avenue and Candlewood Lane. Table 2-2 delineates the various aspects of
each tower.
Year Built 1974 1987
Tower Type Multi-column Toro-Spheroid Hydropillar
Capacity (gallons) 750,000 1,000,000
Ground Elevation 1018.0 997.0
High Water Elevation 1133.5 1133.5
Low Water Elevation 1103.5 1093.5
2.4 DISTRIBUTION SYSTEM
The watermain distribution system consists of 6-inch to 24-inch diameter ductile and cast
iron pipes. The type of watermain material used depends upon the date it was installed, with ductile
iron pipe being installed most recently. Exhibit 2-1 shows pipe 6-inch and greater in diameter. The
exhibit shows only looped pipes that were used for modeling purposes, but does not show dead-end
lines.
2.5 TREATMENT
Current water treatment is the same at the three wells. Each well uses chlorine for
disinfection, polyphosphates for sequestering of iron and manganese, and hydrofluosilicic acid for
fluoridation.
Comprehensive Plan 2020
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SECTION 3 POPULATION GROWTH AND LAND USE
3.1 GENERAL
Future water demand is based on residential, commercial, industrial, and institutional
growth. This growth will depend on overall city growth with respect to population, industry,
commerce and institutions, the spatial distribution of such growth according to land use planning,
and the water consumption trends of different types of water users. The purpose of this chapter is
to project the population and commercial/industrial development throughout the study's planning
period.
3.2 PLANNING PERIOD
The length of the planning period for a civil works project should coincide with the useful
life of the project. For most water improvement projects, a 20-year planning period is used. The
year 2020, and the condition of ultimate City development have been selected as design years for
planning purposes. The 1998 historic water use will be used to evaluate the adequacy of the City's
existing water supply system. The estimated water needs for the other design years were used to
size future production and storage facilities and to guide future distribution system improvements.
Computer modeling of the distribution system facilitated this work.
3.3 LAND USE PLANNING
The first step in the planning process is to develop the design flow or "need" for the facility
based on the anticipated land use within the community. The primary source of land use
information for the City of Prior Lake is the current Land Use Map. This map, shown in Exhibit 4-
1 in Chapter 7, represents the proposed land use for the entire city. A key for the color coding
describing the different zones is provided on the map.
A second important source of land use information is the Prior Lake traffic analysis zone
(TAZ) boundary map, dated May 1999. Figure 2 in Chapter 4 shows traffic analysis zone
boundaries. Based on the T AZ boundary map, City staff forecast population and
residential/commercial/industrial development in the City of Prior Lake by dividing the City into
17 T AZ's. The estimated numbers of housing units, total population, and number of employees in
each of these zones are presented for the condition of ultimate development and are shown in Table
4-1 in Chapter 7.
The land use map and the T AZ boundary map together enable the development of a fairly
specific picture of the expected pattern of development within the City with respect to land use and
time..
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Chapter 8
3.4 POPULATION
Historic population data for the City of Prior Lake was obtained from the City of Prior Lake
and Metropolitan Council. Although the City grew rapidly during the 1970's and 1980's, the City's
population increase has stabilized since 1990. Population projections for this report were based on
the Prior Lake 20 10 Comprehensive Plan and discussions with City planners. On this basis and
also based on the traffic analysis planning results, the ultimate population of Prior Lake has been
calculated to be 30,400. The past populations from 1940 to 1994 appear on Table 5-1 in Chapter 7.
Also shown in the table is the City Planning Department's projections for the years 2005, 2010,
2015, 2020, and ultimate population. The past population and population projections are shown
graphically as Exhibit 5-1 in Chapter 7.
Table 5-2 in Chapter 7 presents numbers of households and the persons per household
ratios. This data indicates that, while the total population and number of households are increasing
in Prior Lake, the number of persons per household is decreasing. This is a trend that is occurring
throughout the Twin Cities at this time.
The City of Prior Lake Land Use Plan is presented and discussed in the "Land Use" section
of the comprehensive plan. Basic data from the City's Land Use Plan will be used for projecting
the future wastewater needs of the City.
The current MUSA is entirely within the City limits but it does not include all of the land
within the City limits. Development of land within the MUSA requires the extension of municipal
sanitary sewer services. Land outside the MUSA cannot be connected to the municipal sewer
system and must be developed with larger individual lots to accommodate onsite wastewater
treatment. As the land inside the current MUSA is developed, there will be interest in expanding
the MUSA to include additional land within the current City limits and possibly, the orderly
annexation area.
Since it is difficult to anticipate exactly which parcels of land will develop first, the City is
requesting that an "undesignated MUSA" be considered for the defined area within the City limits
and the orderly annexation area. The documentation required by the MCES for the undesignated
MUSA is included in the Land Use section of the comprehensive plan.
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3.5 P AST WATER USAGE RECORDS
One of the most important aspects of any comprehensive water study is having a clear
understanding of how a city's consumers use water. With this information and accurate records of
past usage, projections can be made of future water demand. A course of action can then be
developed to meet this demand.
The City of Prior Lake maintains records of the annual volume of raw water pumped from
its wells, as well as the volume of water sold to its customers. These records permit evaluation of
all the components of water demand--the water used by residential, commercial/industrial, and
institutional users.
The demand imposed on a water system can be defined as the total water consumed by
users of the system in a specified period of time. Typically, daily and hourly time periods are
evaluated. Daily demands are usually evaluated on the basis of average day and maximum day
requirements.
Table 3-4 presents historic annual data for water pumped, and average day and maximum
day pump age in Prior Lake. The data was obtained from the annual "Survey of Sewer Use Data"
which also summarizes water pumpage, City staff, and pumping records. Water pumpage records
for the past eleven years (1988-1998) were evaluated to determine average day and maximum day
trends. The ratio of maximum day to average day (peaking factor) varied from a low of 2.30 to a
high of3.l8 and averaged 2.84.
On July 31, 1996, 4.0 million gallons (MO) of water were pumped. This volume represents
the largest volume of water pumped by the City of Prior Lake on any given day and a maximum to
average day ratio of 3 .15.
A maximum day ratio of over 3.00 is considered very high. Maximum day ratios in the
range of 2.50 to 3.00 are the norm. The maximum day pumpage of 4.0 MOD occurred during a
below average rainfall month in July. Although all of the factors contributing to this high
consumption cannot be identified with absolute certainty, it is reasonable to expect that lawn
sprinkling and watering of plantings and gardens were the primary factors. Many new lawns were
established in Prior Lake during the months preceding July of 1996. New sod and plantings have to
be watered much more heavily than established sod and plantings. It is felt that the large number of
new lawns in conjunction with below average rainfall heavily impacted water consumption on July
31, 1996.
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-llf--
t; f.I!
.
Table 3-4. Average and Maximum Daily Water Demand
. . 'T "'1Ir!n:'~~~ I"l" . n~
~ . I ' . lnllllon . '~f ..
vvan:r r~ ." . I . '~. .. . ~ 01 Maximum Day Maximum Day/..
. . Average Day Ratio
! L ........
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
228.1 0.62 - -
211.1 0.58 - -
224.6 0.62 - -
234.5 0.64 - -
262.1 0.72 - -
287.4 0.79 - -
289.9 0.79 - -
335.7 0.92 - -
395.1 1.08 3.39 3.14
384.7 1.05 2.85 2.71
345.9 0.95 2.57 2.71
374.7 1.03 2.44 2.37
389.1 1.07 3.18 2.97
357.6 0.98 2.25 2.30
400.8 1.10 2.95 2.68
407.7 1.12 3.52 3.14
466.7 1.28 4.03 3.15
446.4 1.22 3.88 3.18
481.2 1.32 3.74 2.83
The City of Prior Lake currently utilizes the Jordan sandstone formation (see Table 2-1) for
its water supply. Due to the potential for adversely impacting the Savage Fen, the Minnesota
Department of Natural Resources (MN/DNR) will probably not allow the City of Prior Lake to
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Exhibit 3-5 Typical Hydrograph on Maximum Day
5
4 . .-- ..---- ----. ---.----. --.-.---
E
c-
O)
o
o
o 3-- -------- ------ ------. -
~ .
x
c:
o
+:i
c-
E Maximum Day Demand
::J
rJ)
.c:
o 2 -.
U
'-
Q)
+-'
co
3:
1 --
o
o
2
4
6
6
10 12 14
Time of day, hr
16
16
20
22
5
4
-- 3
2
o
24
increase its appropriation from the Jordan sandstone aquifer above the currently permitted level of
400 million gallons per year (MGY).
Although it was not possible to determine the peak hourly demand in the City of Prior Lake
because the data is not available, a typical demand hydro graph for the maximum day was adopted
from the text book "Water Supply and Pollution Control," fourth edition, by Warren Viessman, Jr.
and Mark J. Hammer. As shown in Exhibit 3-5, the peak hourly demand is approximately 2.0
times the maximum daily demand. This value has been experienced in similar communities and
was used to project future water demand.
Water sales data also gave breakdowns of annual water sales into totals for different
consumer types such as residential, industrial/commercial, and institutional. Table 3-5 shows total
water use for the past 18 years by type of customer. This information was further analyzed to
determine the per capita daily water consumption rate by the residents of Prior Lake. The per
capita water consumption rate is calculated by dividing the average daily water pump age by the
number of residents and is typically expressed as gallons per capita per day (GPCD). Table 3-6
shows that residential per capita water use has averaged 70 gallons per day over the past 18 years.
Per capita water use based on total water use, including residential, industrial/commercial, and
institutional use, has averaged 79 gallons per day over the same period. For future water
consumption projections, 85 GPCD and 75 GPCD were used for total and residential per capita
water use, respectively.
3.6 UNACCOUNTED-FOR WATER USE
As in all water systems, some of the water produced is never purchased by its customers.
The unaccounted-for water use is estimated by comparing the average annual water production with
the average annual metered consumption of a system. The difference between the two values is the
unaccounted-for water use.
Unaccounted-for water use can result from many factors. Some of the most prevalent
factors include unidentified leaks in a pipe network, watermain breaks, periodic fire hydrant
flushing, tank drainage for maintenance purposes, unauthorized use, unmetered services, and
inaccurate meters. Unaccounted-for water use below 10% can be explained by normal system
leakage and meter inaccuracies. Even the best of today's systems have these problems, and it is
simply not cost-effective to try to eliminate all leakage, and meters that are 100% accurate do not
exist. Table 3-7 gives a history of unaccounted-for water use in the City of Prior Lake between
1980 and 1998. In 1986, the amount of water pumped was actually identical to the amount of water
billed to the customers. This may be due to inaccurate well meters. Over the past 19 years,
unaccounted-for water use averaged approximately 9.3 % of the total water pumpage. This level of
unaccounted-for water use is considered acceptable by the American Water Works Association.
This data indicates that roughly 91 % of the water pumped in Prior Lake is sold to customers.
Design flows and consumption figures that follow in this report will be based on pumped water
totals, or production, rather than water sales figures.
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1980 162.6 2.9 16.6 182.1
1981 166.6 3.3 19.0 188.9
1982 181.9 5.6 16.4 203.9
1983 185.2 5.8 17.6 208.6
1984 214.9 6.6 19.0 240.5
1985 235.8 7.3 20.6 263.7
1986 259.3 8.0 22.6 289.9
1987 257.8 14.1 19.8 291.7
1988 330.2 13.7 22.6 366.5
1989 307.8 13.9 23.2 344.9
1990 288.1 11.2 23.7 322.9
1991 298.1 11.3 20.4 329.8
1992 317.0 14.7 19.7 351.4
1993 289.8 7.9 21.0 318.7
1994 326.1 8.3 21.1 355.5
1995 337.5 8.9 24.1 410.0
1996 393.8 13.0 27.8 434.6
1997 390.9 12.2 27.3 430.3
1998 386.8 14.2 431.2
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1980 7,284 61 68
1981 7,430 61 70
1982 7,560 66 74
1983 8,140 62 70
1984 8,700 68 76
1985 9,200 70 79
1986 9,710 73 82
1987 10,153 70 79
1988 10,640 85 94
1989 11,320 74 83
1990 11,482 69 77
1991 11,730 70 77
1992 11,876 73 81
1993 12,072 66 72
1994 13,055 69 75
1995 13,129 70 86
1996 13,519 80 88
1997 14,319 75 82
Average 70 79
GPCD: Gallons per capita per day
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3.7 FUTURE WATER USE PROJECTIONS
In this section, the City's population projections discussed earlier will be combined with the
unit consumption factors calculated earlier to form the basis of future water demand forecasts for
the City. These numbers, in turn, will be used to project the need for additional system facilities
such as new wells, storage and treatment.
1980 182.1 228.1 46.1 20.2
1981 188.9 211.1 22.2 10.5
1982 203.9 224.6 20.7 9.2
1983 208.6 234.5 25.8 11.0
1984 240.5 262.1 21.6 8.3
1985 263.7 287.4 23.7 8.2
1986 289.9 289.9 0.0 0.0
1987 291.7 335.7 44.1 13.1
1988 366.5 395.1 28.6 7.2
1989 344.9 384.7 39.8 10.3
1990 322.9 345.9 23.0 6.6
1991 329.8 374.7 44.9 12.0
1992 351.4 389.1 37.7 9.7
1993 318.7 357.6 38.9 10.9
1994 355.5 400.8 45.4 11.3
1995 370.6 410.0 39.4 9.6
1996 434.6 465.9 31.3 6.7
1997 430.3 445.1 14.8 3.3
1998 431.2 481.1 40.4 9.6 8.1
To project future design flows for the design years (2005, 2010, 2015, 2020 and ultimate
population), two methods were employed. First, total consumption was projected for the design
years, and second, consumption for the different user types was projected individually. It was
conservatively assumed that, for all future design years, the entire Prior Lake population would be
served by City water.
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For the first method, the average day design flow was the product of the projected total
GPCD and the estimated Prior Lake population. The maximum day to average day ratios
previously discussed were used to project maximum day design flows. A peak hour to maximum
day ratio of 2.0 was used to project future peak hour flows. This ratio agrees well with the
experience of similar communities within the Twin Cities metropolitan area.
For the second method, it was assumed that annual industrial/commercial and institutional
consumption per connection would remain constant. Design year consumption then becomes the
product of the consumption per connection and the number of connections. For industrial/
commercial and institutional customers, the number of connections for the design years was
assumed to be proportional to population. Design year residential consumption was based on the
product of the design year population and the projected GPCD residential use. The design year
water consumption projections predicted by the second method were in good agreement with the
design year flows projected by the first method and are presented in Table 3-8. The future design
flows projected by the first method were used for future water system considerations.
3.8 FIRE PROTECTION
The Insurance Services Office (ISO) is a service organization that establishes municipal fire
rate classifications for its member organizations. The ISO member organizations are insurance
companies that offer, among other types of policies, fire insurance policies. Cities such as Prior
Lake are given fire suppression classifications by the ISO, based on the degree of fire protection
they provide. The range of possible classifications is from 1 to 10, with 1 being the optimum
classification. Typical classifications range from 4 to 6. When last rated, the ISO awarded the City
of Prior Lake a classification of 5, based on its capability to deliver the required fire flow to tested
locations throughout the City.
A breakdown of the points awarded the City's water system follows:
. Receiving and Handling Fire Alarms:
. Fire Department:
. Water Supply:
7.36/10.00
17.18/50.00
34.91/40.00
The water supply system for the City of Prior Lake has already earned more than 87% of
full credit. The Fire Department, on the other hand, earned only 39% of full credit. Improvements
to the water system will not help upgrade the City's classification as much as improvements to the
Fire Department due to the effect of the divergence score. The divergence is calculated as follows:
Divergence =
reFire Department) x 0.8 - (Water Supplv)l
2
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2000 1.202 0.080 0.038 1.32 1.32 3.70 7.40
2005 1.389 0.111 0.044 1.54 1.54 4.16 8.32
2010 1.575 0.139 0.050 1.76 1.76 4.58 9.16
2015 1.761 0.169 0.056 1.99 1.99 4.98 9.96
2020 2.055 0.201 0.064 2.32 2.32 5.80 11.60
Ultimate 2.133 0.208 0.067 2.41 2.41 6.02 12.04
* 75 gals/person/day
** 550 gals/connection/day
*** 1,250 gals/connection/day
"I
I
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If the water supply gains one point, the divergence would reduce its credit by -0.5 point and
would result in only a 0.5 point increase in the total credit. On the other hand, if the Fire
Department gains one point, the divergence would improve its credit by 0.4 point and would result
in a 1.4 point increase in the total credit. It is apparent that most of the credits were lost in the Fire
Department.
The ISO last rated the City of Prior Lake in 1996. Prior to this the City of Prior Lake had a
Class 6 rating. The purchase of new fire trucks, additional trained firefighters and the construction
of Fire Station No. I was sufficient to upgrade the rating from a 6 to a 5.
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SECTION 4 PRODUCTION. STORAGE. DISTRIBUTION. AND TREATMENT
4.1 GENERAL
Any evaluation of the adequacy of Prior Lake's existing water distribution system, and any
determination of improvements necessary in the future, must take into account the individual needs
of the different service areas and pressure zones within the City. The City's total production and
storage capacities may technically be. adequate for its overall needs, yet not be able to meet the
needs of a specific area because of inadequate transmission mains. Therefore, production, storage
and distribution needs will be examined. Other factors to be taken into account include the location
of future water treatment facilities and the location and potential capacity of future wells.
This section of the study will evaluate the projected water supply, storage and pumping
requirements based on design flows and computer modeling. Criteria used to determine production
and storage requirements will be discussed in this section. A CYBERNET computer model of the
Prior Lake water distribution system was developed by City staff and was used to determine future
water distribution system needs in the City. In addition, deficient areas in the existing distribution
system will be discussed.
4.2 SUPPLY
4.2.1 Alternate Water Sources
Prior Lake relies on groundwater wells, drawing water from the Jordan Sandstone aquifer
for its potable water supply. This aquifer is a light gray, massively bedded, medium-to-coarse
grain, quartz sandstone which is well-sorted and poorly-cemented. Other potential water sources
include (1) drilling deeper bedrock wells reaching into the Franconia-Ironton-Galesville aquifer or
the Mt. Simon-Hinckley sandstone aquifer, (2) purchasing water from Savage or Shakopee, and (3)
purchasing water from the Shakopee Mdewakanton Sioux Community (SMSC). Current
conditions and economic considerations indicate that groundwater is the best source of water
supply in Prior Lake.
The Minnesota Department of Natural Resources (MN/DNR) will likely limit the
withdrawal of water from the Jordan Sandstone aquifer to the current appropriation of 400 million
gallons per year due to the potential adverse impact on the Savage Fen. The Fen Management Plan
indicated that the fen is being supplied water from the drift, Prairie du Chien, and Jordan aquifers.
Groundwater modeling conducted by Barr Engineering Company demonstrated that any drift,
Prairie du Chien, or Jordan wells located in the City would have an adverse impact on the fen.
Therefore, only the Franconia-Ironton-Galesville or the Mt. Simon-Hinckley bedrock aquifers
remain as groundwater sources available to the City of Prior Lake.
The Franconia-lronton-Galesville sandstones combine to form an aquifer between the
Prairie du Chien-Jordan and Mt. Simon-Hinckley aquifers. Although the Franconia-Ironton-
Galesville formations are classed sandstones, they typically consist of interbedded layers of
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ill .,
.....
sandstone and shale. When sandstones prevail, the formations can yield sufficient water to make
them a viable aquifer. If the formations are mostly shale, they typically don't yield enough water to
make a municipal well economically viable.
In 1998, the cities of Savage and Shakopee drilled Franconia-Ironton-Galesville wells at the
urging of the Minnesota Department of Natural Resources. Both wells are low capacity (200 to 500
gpm) with very large drawdowns. The Shakopee Mdewakanton Sioux Community (SMSC) also
drilled a Franconia-Ironton-Galesville well in 1998. That well encountered 55 to 60 feet of clean,
coarse sandstone at the base of the Galesville formation. The SMSC well is a 750 gpm well.
Both Shakopee and Savage have concerns related to the long-term viability of the
Franconia-Ironton-Galesville formations as a water source. Each of the cities intend to conduct
long-term pumping tests before proceeding with additional wells in these formations.
The Mt. Simon and Hinckley Sandstones combine to form the deepest major aquifer in the
area. The Mt. Simon-Hinckley aquifer is not as heavily utilized in the Twin Cities and surrounding
area as the Prairie du Chien-Jordan aquifers because of lower transmission characteristics, greater
pumping lifts, and increased construction costs. Generally, moderate yields are available from the
Mt. Simon-Hinckley aquifer. This aquifer is being considered more frequently in areas where
contamination of shallower sources has occurred and where competition for groundwater near
heavy pumping centers has created excessive interference between wells.
Information from the Minnesota Geologic Survey (MGS) Scott County Geological Atlas
indicates that well yields from the Mt. Simon-Hinckley aquifer could be expected to range up to
1,200 gpm and perhaps average around 1,000 gpm. This is a moderate yield and less than the 1,500
gpm yield that could be expected from a Jordan aquifer well.
The MNIDNR discourages use of the Mt. Simon/Hinckley aquifer for the following
reasons:
· In some areas, the Mt. SimonlHinckley aquifer is being mined (i.e., water is being
withdrawn faster than the aquifer is being recharged).
· The Mt. SimonlHinckley aquifer, being the deepest aquifer, is being reserved as an
aquifer of last resort in the event upper aquifers become contaminated.
However, because of the MNIDNR's desire to preserve the Savage Fen, they will likely
approve Franconia-Ironton-Galesville wells or possibly Mt. SimonlHinckley wells for the City of
Prior Lake.
The MNIDNR's goal for the Mt. SimonlHinckley aquifer is to reserve its use for domestic
water supply. Domestic water supply is a Priority I water use and does not include lawn sprinkling
which is the lowest priority water use (Priority 6). The MNIDNR has required that the City of Prior
Lake implement a more stringent than normal water conservation program before approval to drill a
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new well is granted. This water conservation program will reduce both average day water
consumption and maxi~um day water consumption, but will impact maximum day water
consumption more heavily because the emphasis will be on reducing lawn sprinkling, which the
MN/DNR considers the least beneficial use of water (Priority 6).
Although the effect of water conservation cannot be predicted with certainty, it is felt that
the following reductions in maximum day ratios are reasonable to expect:
Year Maximum Dav/Average Dav
2000 2.80
2005 2.70
2010 2.60
2015 and thereafter 2.50
The need for future wells, reservoirs, and water treatment will be based on these assumed
reductions in maximum day water consumption.
The City of Prior Lake should explore the possibility of purchasing water from the
neighboring Cities of Shakopee and Savage. However, because both of the cities are also affected
by the Savage Fen situation, they may be unwilling to enter into a long-term agreement to sell
water to the City of Prior Lake.
4.2.2 Water Supply Requirements
Information on the existing wells and their locations has been presented in Section 2 -
Existing Water System. The production capacity of new Mt. Simon-Hinckley wells has been
assumed to be 1,000 gpm. This capacity is usually the maximum capacity for wells drawing from
this aquifer.
The criterion used to determine the amount of required production is given in the American
Water Works Association's Manual of Water Supvlv Practices. This criterion states that the
pumping installation should be sized to provide maximum day demand with anyone of the pumps,
preferably the largest pump, out of service. This concept is commonly referred to as firm pumping
capacity. Although a well pump failure on the maximum day is unlikely, there is a remote
possibility that it could occur.
4.2.3 Future Well Locations
Wells should be located away from sources of potential groundwater contamination. They
should also be located where the groundwater source is adequate and near to where the water is to
be utilized, whether filtered or unfiltered with sequestering. Wellhead protection requirements and
treatment plant location will both affect the location of future wells.
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______ ._..~ __...__n_______..__._._____ - __ ___ ____._.n___
Proposed locations for new wells are indicated in Exhibit 4-1 at the back of this section.
Locations for Wells No.6 and No.7 assume that the new wells will eventually be connected to a
future water treatment plant. Whether or not the treatment plant is constructed in the near future,
Wells No.6 and No.7 should be located at or near the plant site to allow for the possibility of
providing treatment in the future.
4.3 STORAGE
4.3.1 Storage Requirements
Sufficient storage capacity must be available to provide storage for high service pump
operation and system storage for equalization, fire reserve, and emergency needs. Equalization
storage is required to meet water system demands in excess of delivery capability and is sized to
provide demands in excess of the maximum day demand up to peak hour demand. Equalization
storage generally makes up one-half the total storage required and about 20 - 25 percent of the
maximum day demand.
Typically, a water utility provides fire storage adequate for fire flow requirements
recommended by the Insurance Services Office (ISO). The ISO determines fire stream
requirements throughout the water utility's service area based on the characteristics of the individual
buildings in the area. The ISO has established a 3,500 gpm fire flow for supply facilities for the
City of Prior Lake. The ISO recommends that a water system be capable of delivering this level of
fire flow for a duration of three hours.
In addition to satisfying peak water demand and fire flow, elevated storage serves to
pressurize a distribution system. Static pressure in the Prior Lake water system varies from a low
of 50 psi to a high of 100 psi. Generally, static pressures in the range of 60 - 75 psi are considered
optimum for a municipal water system. However, in the case of rolling terrain such as Prior Lake,
it is impossible to limit static pressure to a close pressure range unless a large number of pressure
zones are created. For Prior Lake, it would not be beneficial to do so because the range of static
pressures provided by the two pressure zone system is acceptable.
Table 4-1 shows the number of wells required to meet design flow requirements with
conservation measures in effect. The firm pumping capacity shown in Table 4-1 is based on
pumping 20 hours per day. Because of minimal demand during nighttime hours, the City's
reservoirs will fill late at night and the wells will shut off until early morning. Therefore, 20 hours
of pumping per day is the reasonable maximum time a well will operate. Today the existing firm
pumping capacity is less than the maximum day demand. According to Table 4-1, an additional
well is required immediately to satisfy the concept of firm pumping capacity. A new municipal
well, which will increase the firm pumping capacity to 3.72 million gallons per day, is included in
the existing capital improvement program. By the year 2005, at least two wells will be required, for
a total of five. By the year 2015, three additional wells will be required, for a total of six. By
ultimate development, a total of six wells will be needed. The required ultimate firm pumping
capacity will be 6.12 million gallons per day. Cost estimates for the construction of new wells will
be discussed later.
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It is proposed that Well No.6 and Well No.7 be located near the existing wells. Wells No.
6 and 7 are proposed to withdraw water from the Mt. Simon-Hinckley aquifer. A minimum
separation distance of one-half mile should be planned between these wells. It is proposed that
Well No.8 be located at the existing one million gallon elevated tower off Crest Avenue. Water
from Wells No.3, 4, 5, 6, and 7 would be filtered by the proposed water treatment plant. Water
from Well No.8 would not be filtered, but would be blended with filtered water in the elevated
tower.
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- ----;----
,.
i~
1996
2000
2005
2010
2015
2020
Ultimate
Projected
Maximum
Day Demand* .
(MGD)
4.03***
3.70
4.16
4.58
4.92
5.80
6.02
Existing Firm
Pumping
Capacity**
... (MGD)
2.52
2.52
2.52
2.52
2.52
2.52
2.52
1.51
1.18
1.64
2.06
2.46
3.28
3.50
1,258 2.52
983 Well No.6 3.72
1,367 Well No.7 4.92
1,717 4.92
2,050 Well No.8 6.12
2,733 6.12
2,917 6.12
* Based on the following maximum to average day ratios:
1996 - 3.15
2000 - 2.80
2005 - 2.70
2010 - 2.60
2015 - 2.50
2020 - 2.50
Ultimate - 2.50
* * Firm pumping capacity is based on 20 hour pumping time with the largest pump out of service.
*** On July 31, 1996,4.0 MGD were pumped.
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Storage requirements are presented in Table 4-2. Design flows from Table 3-8 were used in
the storage estimation, as well as firm well capacity calculated from well data in Table 4-1. The
storage requirements in Table 4-2 show that the existing storage capacity, a combined 1.75 million
gallons, is adequate to meet the City's storage requirement with conservation measures to nearly
the year 2020. Should a water treatment plant be constructed, it should be constructed with a clear
well (ground storage), to provide flexibility in operating the water treatment plant and to provide
the additional storage required necessary for the year 2020 and beyond.
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4-2StorageR.equiremenfProjection
Ultimate
(l\'IG)
Maximum Day Demand 3.70 4.16 4.58 4.98 5.80 6.02
Fire Flow 0.63 0.63 0.63 0.63 0.63 0.63
Equalizing Storage(l) 0.74 0.83 0.92 1.00 1.16 1.20
Total Water Required 5.07 5.62 6.13 6.61 7.59 7.85
Firm Supply 3.72(2) 4.92(3) 4.92(3) 6.1i4) 6.li4) 6.1i4)
Net Required From Storage 1.35 0.70 1.21 0.49 1.47 1.73
Gross Storage Required(5) 1.80 0.93 1.61 0.65 1.96 2.31
Existing Storage 1.75 1.75 1.75 1.75 1.75 1.75
Additional Required Storage 0.05 0.00 0.00 0.00 0.21 0.56
Proposed Additional Storage 0.00 0.00 0.00 0.00 0.00 0.00
Total Storage with Improvements 1.75 1.75 1.75 1.75 1.75 1.75
(1)
(2)
(3)
(4)
(5)
Equalizing storage of 20% of maximum day demand should be provided to satisfy peak hourly demands.
Assumes Well No.6 is drilled.
Assumes Well No.7 is drilled.
Assumes Well No.8 is drilled.
Allows for a factor of safety in the event that the storage towers aren't completely full on the morning of the maximum day.
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4.4 WATER TREATMENT
The purpose of water treatment is to provide customers with high quality water that meets
federal and state drinking water standards and is aesthetically acceptable to the customers. The
complexity of a water treatment plant is dependent on the quality of the source water. The water
from Prior Lake's wells is, in general, good quality water. The water does not exceed any of the
Safe Drinking Water Act (SDW A) Primary Drinking Water Standards, but does exceed Secondary
Standards for iron and manganese. The iron concentration in Well No.5 and the manganese
concentrations in Wells No.3, 4, and 5 are all above the Secondary Standards. A detailed review of
the water quality of the three existing wells is presented in Section 5. Refer to Table 5-2 for the
iron and manganese concentrations in each well.
Although exceeding the Secondary Standards will not impact a consumer's health, the water
quality will be undesirable for aesthetic reasons. Waters with concentrations above the Secondary
Standards will typically cause customer complaints if some form of water treatment is not used.
Excessive iron and manganese concentrations generate red, black, brown, and yellow water
complaints. These complaints can be controlled either by sequestering or by removing the iron and
manganese. Sequestering can be installed at the wellhead at minimal capital cost, but iron and
manganese removal requires a treatment plant and substantial capital cost.
4.4.1 Current Treatment Method
The City currently is using polyphosphates at all three wells to sequester iron and
manganese. The City has seen a dramatic decrease in customer complaints since the addition of
polyphosphates a few years ago. Sequestering minimizes customer complaints, but does not
actually remove the iron and manganese. The polyphosphates chemically bind with the iron and
manganese to prevent them from forming precipitates which cause red, black, brown, and yellow
water. However, the chemical bond deteriorates with time.
Sequestering, in general, is not recommended for waters with combined iron and
manganese concentrations greater than 1 mg/L or for waters with manganese concentrations greater
than 0.1 mg/L. Although sequestering will reduce customer complaints at concentrations greater
than the recommended limits, the greater the iron and manganese concentrations, the less effective
the sequestering will be. Sequestering at Well No.3, which has a manganese concentration of 0.74
mg/L, therefore is probably not as effective.
4.4.2 Proposed Water Treatment Method
Although sequestering can control customer complaints, the iron and manganese still
remain in the system. The most effective means of controlling customer complaints associated with
red, brown, black, and yellow water is to remove the iron and manganese before it enters the
distribution system.
A water treatment plant is optional for the City of Prior Lake because the City's water
supply meets all Safe Drinking Water Act Primary Standards. Filtering of the water supply in a
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water treatment plant would remove iron and manganese, and would further minimize complaints
related to black, red, brown, or yellow water. Many cities have conducted customer surveys to
determine if their residents want a water treatment plant. A similar approach could be used by the
City of Prior Lake. The survey should outline the benefits of a water treatment plant and state the
projected increase in water rates that would result if the plant is constructed. This information
would then permit residents to make an informed decision on whether they wish to support
construction of a water treatment plant.
The City currently owns a large tract ofland near Wells No.3 and 4 that is suitable for, and
has been set aside in anticipation of, a water treatment plant. Raw watermains would be installed to
connect all three ofthe existing wells and future Wells No.6 and No.7 to the water treatment plant.
A water treatment plant will provide several benefits to the City including:
1. Reduction in water quality complaints.
2. More stable water.
3. Reduction in watermain flushing.
4. Reduction in chlorine demand.
5. More stable chlorine residual.
6. More efficient home softening.
7. Reduction in tastes and odors.
The two basic processes of iron and manganese removal are oxidation of the iron and
manganese and removal of the particulates formed during oxidation by filtration. The oxidation and
filtration processes are described in the following sections.
4.4.3 Oxidation
Iron and manganese are soluble in water and must be oxidized to create insoluble iron and
manganese particulates which can then be removed through filtration. Oxidation can be
accomplished using air or chemicals.
Aeration - Air can be added using gravity or pressure aeration. In gravity aeration, water is
cascaded down over a series of trays or slats. The cascading action creates more water surface area
for oxygen transfer to occur, which then oxidizes the iron and manganese. Gravity aeration is
recommended for treatment plants with gravity filters and clear wells. In pressure aeration, an air
compressor is used to force air into a pressurized watermain. Pressure aeration has less capital cost
and energy costs than gravity aeration, and is recommended for pressure filter systems. Either
aeration method has a tendency to increase the amount of dissolved oxygen in the water
distribution system. An increased dissolved oxygen concentration increases the corrosivity of the
water and can cause higher lead and copper concentrations at the customer's tap.
Chemical Oxidation - Iron and manganese can be chemically oxidized by adding a
chemical oxidant such as chlorine or potassium permanganate to the raw water. Potassium
permanganate is more expensive to use than chlorine, but for filters with manganese greensand
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media, potassium permanganate is needed to regenerate the manganese coating on the greensand.
The manganese coating optimizes the removal of manganese through the filter. The chlorine and
potassium permanganate chemical feed rates should be set so that the minimal amount of potassium
permanganate is used in conjunction with the chlorine feed to attain effective iron and manganese
removal through the filter.
Chemical oxidation was selected as the recommended method of oxidation for a Prior Lake
water treatment plant. This decision was based on the additional costs and potential corrosivity
problems associated with aeration. The treatment plant should be designed to consider retrofitting
to provide gravity or pressure aeration in case aeration is needed in the future.
4.4.4 Filters
Once iron and manganese have been oxidized, a filter is used to remove the particulates
from the water. Filtration is either by gravity or pressure. For Prior Lake's water, gravity filters
would be preferable to pressure filters. The gravity filters would drain to a clearwell. A clearwell
is a reservoir adjacent to a water treatment plant which stores treated water and helps minimize the
size of the treatment plant by maximizing the number of hours the plant can operate during the day.
In a gravity filter system, the water would be pumped to the treatment plant from the wells,
then oxidized and filtered, and finally pumped from the clearwell into the distribution system.
Manganese greensand would be suitable filter media for the filters. Manganese greensand
filters have been used very effectively to remove iron and manganese from waters with iron and
manganese concentrations similar to Prior Lake's. Typical filtration rates for manganese greensand
filters are in the range of 2 gallons per minute per square foot (gpm/sf) of filter area.
Based on the relatively high manganese concentrations at each well, it is recommended that
pilot-scale testing be conducted. A pilot-scale test is beneficial to determine the optimum filtration
rate, filter media, and other design criteria for a full-scale filter system.
Gravity filter design would include piping to evenly distribute the influent flow over the
filter media, provisions for underdrainage, backwashing, and backwash water reclamation. Because
of the manganese concentrations at all three wells, it is recommended that the proposed filters use
an air and water scour with a water backwash. The filters would be split into four cells. Splitting
into cells would allow backwashing one portion of the filter while the remainder of the filter
continues to filter water.
4.4.5 Filter Backwash
Filters require periodic backwashing to remove particulates that have adhered to the media
and that are clogged in the interstices between the media particles. The filter loading rate and the
particulate load both affect the length of time that a filter can be operated before it needs
backwashing. The particulate loading is dependent on the iron and manganese concentrations in
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TU
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the raw water and the amount of time for oxidizing and flocculation. With a fairly constant
particulate load, the higher the hydraulic loading rate, the shorter the filter run.
Backwashing would be conducted one cell at a time with the rest of the filter in service.
This design provides for maximum flow through the filter during backwashing. Each cell of the
filter would be backwashed with the water from the clear well. Backwash water would be piped to
a backwash water reclamation basin.
Filters can be designed to backwash after a specified time period or after the headloss
through the filter reaches a preset level. Initiation of backwash can be automatic or manual. For
manual initiation, it is preferable to operate so that not more than one shift of operating staff is
required. A 24-hour minimum duration between backwash cycles is recommended for the proposed
filters. A 24-hour backwash cycle will keep the number of operating shifts to one per day.
4.4.6 Backwash Water Reclamation
To minimize the volume of flow to the sanitary sewer, the filter backwash water should be
collected in a backwash water reclamation basin for reuse. Only the concentrated sludge should be
released to the sanitary sewer to minimize wastewater treatment charges.
After backwash, and after sufficient time has passed for most of the particulates in the
backwash water to settle, a backwash recycle pump would pump clarified backwash water from the
reclamation basin into the filter influent line. A ratio of 10% backwash water to 90% raw water is
recommended for backwash water recycling.
A below grade, reinforced concrete structure was selected for the reclamation basin and was
used for cost estimating purposes. A below grade structure allows the backwash water to flow to
the reclamation basin by gravity, but requires a pump to recycle the backwash water. The
backwash water flows from the filter to the reclamation basin. As the backwash water settles, a
sludge is formed on the bottom of the reclaim basin. A sludge collection system would be used to
remove the sludge. Depending on the hydraulics, the sludge would flow by gravity to the sanitary
sewer or a pump would be used to discharge the waste. A sludge pump was considered for cost
estimating purposes. To speed the settling of the particulates in the backwash water, a polymer
feed system could be added. This would allow the backwash water to be recycled sooner after
backwash.
4.4.7 Chemical Feed Systems
The eXIstmg wells all use chlorine for disinfection, polyphosphates for
sequestering/corrosion control, and fluoride to prevent tooth decay. The proposed filter plant would
require potassium permanganate, chlorine, and fluoride chemical addition. The existing chemical
feed systems would be removed from Wells No.3, 4, and 5, and all chemical additions would be
done at the treatment plant.
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4.4.8 System Operation and Maintenance
The water treatment plant would require additional operating staff labor. The most
significant additional labor would be for an operator to backwash the filters. Some additional
maintenance time is also anticipated for the gravity filter system, high service pumps, backwash
pump, and sludge collection equipment.
4.4.9 Water Treatment Plant Construction
Due to the age and poor condition of the existing wellhouse at Well No.4, it is
recommended that the City consider installing a submersible pump and demolishing the existing
wellhouse. The wellhouse at Well No.3 is brand new, and wellhouse No.5 should remain as is
because it is in good condition. A central dehumidification system is recommended for the water
treatment plant to prevent "sweating" of piping and filters. The plant would be heated using
multiple gas unit heaters.
Electrical items would include electrical service and transformer, manual transfer switch
and standby generator, motor control center, lighting, low voltage wiring, and SCADA controls for
the plant and the existing well pumps.
Table 4-3 shows preliminary design criteria for a water treatment plant.
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TABLE 4-3
WATER TREATMENT PLANT - DESIGN CRITERIA
Total Flow
Raw Water Iron Concentration
Raw Water Manganese Concentration
Finished Water Iron Concentration
Finished Water Manganese Concentration
4,200 gpm (5.0 MGD)
0.10 to 0.51 mg/L
0.26 to 0.74 mg/L
< 0.1 0 mg/L
< 0.05 mg/L
Gravity Filters
Number of Units
Width
Length
Number of CellslUnit
Filter Media
Anthracite cap
Manganese greensand
Filter Loading Rate During Normal Operation
Maximum Headloss Per Cell
Backwash
Backwash Duration
Backwash Rate
Backwash Flow
2
38 feet
38 feet
4
12" bed thickness
18" bed thickness
1.5 gpm/ft2 (2)
1 0 feet
combined air water scour with water wash
10 minutes
10 gpm/sf
3,600 gpm
Basin Type
Basin volume
Basin dimensions
Basin water depth
Recycle rate
Recycle Pump
Recycle duration
below grade reinforced concrete
150,000 gallons
45 feet by 45 feet
10ft
10 % of total filter influent
210 gpm
12 hours
New Chemical Feed Systems
Oxidation
Disinfection (I)
Fluoridation (1)
potassium permanganate
chlorine gas
hydrotluosilicic acid
(1) Replaces existing chemical systems for Wells No.3, 4, and 5.
(2) Conservative value. A pilot plant may predict a less conservative filtration rate.
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4.5 DISTRIBUTION SYSTEM
4.5.1 Distribution System Requirements
The adequacy of a distribution system depends not only on the size of watermains but also
on location and capacity of production, treatment and storage facilities for the system. Watermain
sizes are usually determined by fire demands since fire demands result in much higher flows than
other demands. Watermains must be sized to supply large demands locally and transfer water to
areas more remote from supply and storage facilities. As Prior Lake grows, the maximum demands
of the individual service areas will become more significant relative to the fire demands. The Prior
Lake water distribution system has been modeled with the CYBERNET computer model to aid in
evaluating its current adequacy and to design future improvements.
The evaluation of the existing watermain system was based on the American Water Works
Association's Distribution Requirements for Fire Protection. The primary evaluation of watermain
was made under peak hour demand conditions. The evaluation also included maximum day
demand plus fire flow demand. In assessing model results, the predicted conditions for each
individual watermain were evaluated in order to assess the performance of the watermain. The
head loss per watermain was examined. The velocity predicted for each watermain and the head
loss per 1,000 feet was also examined. Generally, watermains are considered potentially deficient,
or most-limiting segments, if they are predicted to have any of the following conditions:
. Velocities greater than 5 feet per second (ft/s),
. Head losses greater than 10 ft/ 1 000 ft, or
. Large-diameter pipes (16 inches or greater) having head losses greater than 3 ft/lOOO ft.
Watermains become limiting factors in delivering water at acceptable pressures to the
extremities of the system when velocities approach 5 ft/s. As head losses in a watermain approach
10 ft/l,OOO ft, a substantiall~ss of pressure occurs in that length of watermain. Watermains with
head losses exceeding 10 ft/I,OOO ft are generally a contributing factor to inadequate system
pressures. The ultimate test of water distribution system adequacy is the pressure at the point of
delivery.
4.5.2 CYBERNET Computer Model
The CYBERNET model of the Prior Lake water distribution system was created by City
staff. For this study, the model was updated. The updating included development of a new demand
distribution for proposed design years. Watermain friction factors were reviewed based on pipe age
information and other factors.
The calibrated model was first employed to analyze the adequacy of the existing water
system under current average day, maximum day, and peak hourly water consumption. Based on
the computer model, a network analysis was used to identify any deficiencies in the system and to
develop the most cost-effective means to correct the deficiencies.
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.. 11:'
During the average day, the water elevations in the towers were assumed to be at the near
full position with no pumps in operation. To find a more realistic operational condition during
maximum day water consumption, the extended period simulation (EPS) feature of the
CYBERNET program was utilized. The EPS took the system demand at each individual hour and
performed a steady state simulation. The results were then used to determine the water elevation in
each of the towers and the number of pumps. in operation. These conditions were once again
analyzed with steady state simulation. The program continued to iterate this procedure until all
conditions were satisfied. Then, it would begin a simulation of the next hour. Through the EPS
analysis, the designers were allowed to view the conditions of the water system throughout the
maximum day and find the critical operation conditions. Results of the system static pressures
during the current average and maximum daily demands are plotted in pressure contours and are
shown in Exhibits 4-2 and 4-3 at the back of the report.
The water system was also examined to determine the fire flow availability throughout the
system. Fire flow availability is defined as the flow available at one location during a fire event
while maintaining a minimum of 20 psi residual pressure in the system. All fire flow simulations
were based on firm pumping capacity which is the capacity with the largest well out of service. To
ensure that the locations for fire flow simulation could cover the entire water system, a total of 348
locations were selected and analyzed individually to determine the available fire flow at each
location while maintaining a 20 psi residual pressure throughout the system.
4.5.3 Existing Distribution System Improvements
The Prior Lake water distribution system is generally quite adequate to meet present
demands. An exception is in areas where hydrants are connected to smaller watermains resulting in
inadequate fire flows during 1992 ISO fire flow tests. Existing facilities and watermains are
indicated in Exhibit 2-1, Existing Modeled Water System.
Prior Lake High School has an available fire flow of approximately 3,200 gpm at 20 psi,
which is less than the 5,500 gpm recommended by ISO. However, a fire sprinkler system was
installed in the high school in fall of 1996. Installation of the sprinkler system reduced the required
fire flow to less than the 3,200 gpm that is available. Therefore, no watermain improvements in the
vicinity of the high school should be necessary.
A similar situation occurs at the intersection of Main Street and Pleasant Avenue. Due to the
fact that this is a commercial zoned area, ISO recommends that a 2,500 gpm fire flow be available
at this location. The CYBERNET modeling results indicated that the current available fire flow is
approximately 2,000 gpm. A solution would be to replace the existing 6-inch watermain with an
8-inch watermain along Pleasant Avenue from Duluth Avenue to Main Street and to construct an 8-
inch watermain along State Trunk Highway 13 from CSAH 39 to CSAH 21. However, because the
available fire flow is only 500 gpm less than the recommended fire flow, this would be a large
expenditure for modest benefits.
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Water quality problems due to poor circulation and watermain dead ends have occurred in
the Business Office Park in the southeast comer of the City. All of the watermains supplying water
to the Business Office Park are dead ends. When the property to the south of the Business Office
Park develops, these watermains should be looped together to minimize the risk of a single
watermain break or poor circulation.
The proposed water distribution system with proposed improvements, trunk watermain
addition, and water supply locations is shown in Exhibit 4-1.
4.6 CAPITAL IMPROVEMENT PLAN (CIP)
The overall plan for Prior Lake's water system involves the strategic location of wells and,
potentially, a water treatment plant connected by watermains of 12-inch to 20-inch diameter. This
would allow the water plant to produce water and deliver it to storage at the lowest possible cost
and provide the City with a flexible system capable of meeting all the water needs of its consumers.
Exhibit 4-1 shows this overall plan. This plan depicts a grid of major trunk watermains with
enough loops to protect the City from catastrophe should any single watermain break. The
watermains have been shown along existing roads. However, most of the watermains will actually
be constructed through new developments.
4.6.1 Five Year CIP
This section will define the minimum improvements needed to meet the City's water
demands for the Year 2005. Based on the calculations shown in Table 4-1, an additional 983 gpm
of supply is required to meet maximum day demand with firm pumping capacity. The new well
should be a 1,000 gpm Mt. Simon/Hinckley well. Once the new well has been installed, the City
will have firm pumping capacity of 3.72 million gallons per day. Construction of a 5 MOD water
treatment plant should be completed by the Year 2005 if residents respond favorably to the
customer survey.
The following watermain improvements should be considered:
1. A 16-inch watermain going south from existing Fish Point Road to CSAH 21 when
Fish Point Road is completed.
2. A 12-inch watermain through the proposed Wensmann business office park. The
watermain would extend from Pike Lake Trail west to the Vierling property.
3. A 12-inch watermain extended through the newly annexed property known as the
Deerfield Development.
4. A 16-inch watermain along CSAH 21 from Carraige Hills Parkway north to CSAH 42.
5. A 12-inch watermain along CSAH 42 from CSAH 83 west to the Corporate limits.
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6. A 16-inch watermain along CSAH 42 from CSAH 21 west to CSAH 83.
Improvements 1, 2, 3 and 4 will be installed with future developments. Therefore, they are
developer driven and a strict 5-year time line does not apply.
4.6.2 Twenty Year CIP
This section will define the minimum improvements needed to meet the City's water
demand for Year 2020. It was assumed that all improvements described in the five-year capital
improvement plan have been completed.
By the Year 2020, the City will need a minimum of 1,750 gpm of additional supply. Again,
this will take the form of new wells. One well (Well No.7) will pump to the water treatment plant
if constructed for the Year 2005 needs. The other well (Well No.8) will pump unfiltered water into
the one million gallon elevated tower off Crest Avenue. Once the new wells have been installed,
the City will have a firm pumping capacity of6.12 million gallons per day.
Watermain improvements that should be considered include the following:
1. A 12-inch trunk. watermain along CSAH 83 from Wilds Parkway to CSAH 42 and a 12-
inch trunk. watermain along CSAH 83 from CSAH 42 to the corporate limits.
2. A 12-inch trunk watermain going north from the intersection of CSAH 42 and CSAH
21 to the corporate limits.
3. A 12-inch trunk watermain from the proposed business office park located at CSAH 42
and Pike Lake Trail west through the Vierling property to CSAH 21.
4. A 12-inch trunk. watermain loop should be installed starting from the intersection of
CSAH 42 and Pike Lake Trail, then proceeding north along Pike Lake Trail. This loop
should continue east for 3,000 feet and then go south just west of CSAH 18 to connect
to the existing 12-inch crossing under CSAH 42 at Candlewood Lane. Based on the
CYBERNET modeling results, high pressures, of greater than 100 psi, could occur in
several areas of relatively low elevation in the Titus Addition. We recommend that
pressure regulating valves (PRVs) be installed in each household rather than on the
trunk. watermain because installation of PRVs on trunk. watermains has drawbacks.
There is headloss through PRVs, and the PRVs discharge pressure is fixed unless the
upstream pressure becomes too low. Increasing watermain sizes upstream of PRVs
may not provide the increase in water supply to an area that is desired. Therefore,
during periods of high demand, such as during a fire, area water pressures downstream
of PR V s are more likely to be limited by the PR V pressure settings and the head losses
downstream ofthe valves rather than by conditions upstream of the valves.
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5. A 16-inch trunk watermain along CSAH 82 from the existing 16-inch watermain at
Wilds Parkway to CSAH 83.
6. A 12-inch trunk watermain along CSAH 21 from the Prior Lake Baptist Church east to
the Corporate limits.
All of these trunk watermains with the exception of 1 and 5 will be installed with future
developments. Therefore, they are developer driven and a strict timeline does not apply.
4.7 CAPITAL IMPROVEMENT PLAN COST ESTIMATES
This section will present estimated construction and project costs, in 1999 dollars, for the
water system improvements and trunk watermain extensions. The estimated costs are presented in
Tables 4-4 and 4-5.
The total project cost includes the estimated construction cost, an additional 10 percent for
construction contingencies and easements, and 28 percent for indirect costs, which include the City
administration, engineering, fiscal and legal costs. The estimated costs for wells include the well,
well pump, wellhouse, treatment, and facilities. No costs have been included for the acquisition of
land. The City already owns the land for the water treatment plant, Well No.6, and Well No.8. It
has been assumed that Well No.7 would be constructed on a subdivision outlot.
The total costs of the five year CIP and 20 year CIP are approximately $7.7 million and
$3.1 million.
Comprehensive Plan 2020
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l'r
Table 4-4. Prior Lake 5 Year Capital Improvement Plan
Watennain Construction Cost
Well No.6 Construction Cost
Water Treatment Plant Construction
Cost *
146,000
45,000
450,000
1,605,000
495,000
4,950,000
1,459,000
450,000
4,500,000
TOTAL
6,409,000
7,050,000
641,000
* Includes a 750,000 gallon clear well (ground storage)
** Reflects a reduced percentage for administration and engineering cost.
***Total cost less portion paid by developers.
.. Administration..
and
Engineering.
.. Cost (30%)
481,000
20,000**
1,386,000
1,887,000
2,086,000
515,000
6,336,000
918,000***
515,000
6,336,000
8,937,000
7,769,000
Table 4-5. Prior Lake 20 Year Capital Improvement Plan
Watennain Construction Cost
1,328,000
1,400,000
2,728,000
133,000
140,000
273,000
1,461,000
1,540,000
3,001,000
Well No.7 & 8 Construction Cost
TOTAL
* Total cost less portion paid by developers.
Administration
and
Engineering
Cost (30%)
438,000
431,000
869,000
1,899,000
1,971,000
3,870,000
1,142,000*
1,971,000
3,113,000
Comprehensive Plan 2020
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SECTION 5 WATER QUALITY
5.1 GENERAL
This section examines the water quality at each of the wells in the Prior Lake water system
and compares Prior Lake's water quality with federal and state water quality legislation. Prior
Lake's current practice of chlorination, fluoridation and sequestering of iron and manganese at the
wellhead is providing the City with water that complies with current water quality legislation.
5.2 SAFE DRINKING WATER ACT (SDWA)
5.2.1 General
The SDW A was first implemented by Congress in 1974, setting water quality standards that
all water suppliers are required to meet. The 1986 Amendments to the SDW A generated a new
series of regulations that suppliers now have to meet. In 1996, the Safe Drinking Water Act was
again amended and will result in additional new regulations. As the new regulations are
implemented, suppliers must re-assess their facilities and take action to meet the new regulations.
Amendments to the SDW A and their current status are shown in Table 5-1:
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. . >... . ... .... ,.. .. ... ..,.
. ..,.. ...'.... . . . - - - ... .
.:. .. .,... ... ... . . ..,
. I . . : n._.. .. ~Dal
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.:.. .: . .: . . . ,:..>:..,.'. .. I .. ,.
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Fluoride November 1985 Currently in
Effect
vacs (Phase I)
November 1985 Currently in
Effect
Surface Water Treatment Rule
November 1987 Currently in
Effect
Total Coliform Rule
November 1987 Currently in
Effect
Lead and Copper Rule
August 1988 Currently in
Effect
Phase II sacs and lacs
May 1989 Currently in
Effect
Phase V sacs and laCs
July 1990 Currently in
Effect
Groundwater Disinfection Rule
January 1999 January 2001
January 2000 January 200 I
August 2000
November 2000
Arsenic
Radon
Radionuclides
Disinfection and Disinfection
November 2000 May 2002
Byproducts (Stage 2)
Sulfate
August 2003
February 2005
New Contaminants
(1 )Anticipated dates based on EP A Schedules.
Sources: Minnesota Department of Health and A WW A SDW A Advisor
Additional information is shown in Appendix B.
These SDW A regulations are discussed in the following paragraphs. The following
discussion reviews the impact of these regulations on Prior Lake's water supply based upon the
results of past water quality sampling programs.
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5.2.2 Primary Drinking Water Standards
Primary Drinking Water Standards were developed as part of the SDW A of 1974 to
regulate contaminants which may affect human health. These contaminants include organic and
inorganic chemicals, microbiological contaminants, and turbidity. Maximum Contaminant Levels
(MCLs) are enforceable standards which public water suppliers must meet to avoid any action by
the regulatory authority. Maximum Contaminant Level Goals (MCLGs) are the levels below
which the Environmental Protection Agency (EP A) has determined that a compound poses no
known or anticipated effects on human health. The EP A has not made MCLGs enforceable
because these levels are often difficult to obtain. The EP A has set the MCLs as close to the
MCLGs as feasibly possible using the current best available technology (BAT). See Table G-l in
Appendix G for a listing of the Primary Drinking Water Standards.
5.2.3 Secondary Drinking Water Standards
Secondary Drinking Water Standards were also part of the 1974 SD W A. The Secondary
Standards relate to contaminants which do not present a definite health risk but are undesirable for
aesthetic reasons.
Secondary Maximum Contaminant Levels (SMCLs) are non-enforceable standards based
upon achieving acceptable quality, appearance, and odor control. SMCLs are suggested limits. See
Table G-2 in Appendix G for a listing ofthe Secondary Drinking Water Standards.
5.2.4 Fluoride
Fluoride was originally regulated under the 1974 SDWA. Regulation of fluorides was
included in the act because of the compound's relationship to dental hygiene. The regulations were
then revised as part of the 1986 SDW A Amendments. The current MCL for fluoride is 4.0 mg/l,
and the SMCL is 2.0 mg/l.
5.2.5 Volatile Organic Chemicals (phase I)
Twenty-one volatile organic chemicals (VOCs) have been added to the SDW A, since the
original 1974 act. VOCs are of concern because of the toxic and carcinogenic effects they may
have on humans. VOCs are primarily found in groundwater which has been polluted by seepage
from industrial activities.
5.2.6 Surface Water Treatment Rule
The Surface Water Treatment Rule (SWTR) sets standards for disinfection requirements
and finished water turbidity levels for public water supplies utilizing surface water or groundwater
under the influence of a surface water. The groundwater supply for Prior Lake is not under the
influence of surface water. Therefore, this rule is not applicable.
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5.2.7 Total Coliform Rule
Coliforms are used as general indicator organisms to identify waters which may contain
pathogenic microbiological species that can cause disease when ingested. Of greatest concern to
the consumer are those organisms which are transferred to the water through the feces of
warm-blooded animals.
The total coliform test detects a wide range of indicator organisms, including some that are
often present without any fecal contamination. The Escherichia coliform, or fecal coliform, tests
are more specific and indicate only those organisms with fecal origin.
The Coliform Rule establishes compliance criteria based upon presence or absence of total
coliform. The rule limits the presence of total coliform organisms to less than five percent of total
samples analyzed.
5.2.8 Lead and Copper Rule
The Lead and Copper Rule regulates these compounds through the establishment of
treatment technique requirements. Treatment is required when lead or copper concentrations
exceed certain "action levels" at consumer taps. To be in compliance with the lead and copper rule,
90 percent of the tap samples must contain less than 0.015 mg/l of lead and 1.3 mg/l of copper.
5.2.9 Phase II SOCs and IOCs
The Phase II Rule establishes MCLs and SMCLs for a large number of synthetic organic
chemicals (SOCs), inorganic chemicals (IOCs), pesticides, and polychlorinated biphenyls (PCBs).
Some of these contaminants were previously regulated under the original SDW A, but have been
superseded with the implementation of Phase II.
5.2.10 Phase V SOCs and IOCs
The Phase V rule established MCLs for additional inorganic chemicals (lOCs), synthetic
organic chemicals (SOCs), and volatile organic chemicals (VOCs).
5.2.11 Groundwater Disinfection Rule
The Groundwater Disinfection Rule is expected to set standards for disinfection
requirements in systems supplied by a groundwater source.
All systems using a groundwater source are anticipated to be required to provide primary
disinfection unless it can be demonstrated that the source has no contamination or that
autopurification mechanisms are providing sufficient microbial inactivation. Each system will also
be required to demonstrate that a disinfectant residual is maintained in the distribution system.
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Prior Lake currently provides primary disinfection at each well by the application of
chlorine. As long as adequate disinfectant residuals are maintained in the distribution system,
nothing needs to be done to comply with this rule.
5.2.12 Arsenic
Arsenic is on the list of 83 contaminants required by the 1986 SDW A amendments to be
regulated by the EP A.
The EP A is currently under a court order to develop a proposed rule on arsenic. The EP A
has requested additional time to develop the rule on several occasions. The proposed rule is to be
developed by January, 2000.
Several alternative arsenic MCLs are being considered varying from 0.002 mg/l to 0.02
mg/l. Recent Minnesota Department of Health (MN/DOH) testing indicates that Prior Lake has
arsenic levels less than 0.001 mg/l; therefore, Prior Lake should have no problems meeting any of
the arsenic MCLs currently being considered.
5.2.13 Radionuclides and Radon
At present, the primary standards for radionuclides are as follows:
Radionuclide
Radium
(Ra226 & Ra228 combined)
US EP A Primary Standard
(pCi/L )
US EP A Proposed
Primary Standard
5
No Change
Gross Alpha Emitters
(less uranium)
15
No Change
Beta Emitters and Photons
50 (triggers screening for
exposure based limit of 4
mrems/year)
No Change
Uranium
30 pCi/L
The Minnesota Department of Health has tested the City's water supply for gross alpha and
gross beta. Radon tests have not been performed.
The gross alpha and gross beta tests were performed on water samples taken at City Hall
and show a gross alpha of 1.2 picocuries per liter (1.2 pC ilL ) and a gross beta of 1.4 pCi/L.
A description of each radionuclide classification follows:
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Gross Alpha Emitters:
The gross alpha test measures the alpha decays of uranium, thorium, palladium, radium
226, and polonium isotopes. The standard for gross alpha emitters, less the contribution of
uranium, is 15 pCi/L. Water distribution system samples tested show a gross alpha
concentration of 1.2 pCi/L, well beneath the standard of 15 pCi/L.
Since the City's wells are all finished iri the Jordan formation and are in the same general
area, it is unlikely that any of the City's wells would individually exceed the standard of 15
pCi/L.
Beta Emitters and Photons:
This standard was established primarily for man-made radionuclide contaminants. The
water system test results of 1.4 pCi/L is far below the screening limit of 50 pCi/L. It should
be noted that radium 228, a naturally occurring radionuclide, is a beta emitter, but is not
counted in the gross beta test since the decay energy of radium 228 is below the detection
energy limit used for the test.
Radon:
Currently, there is not a standard for radon in drinking water. Establishing a primary
standard of 300 pCi/L was proposed in 1991. At this time, the proposed standard is not
known, but could be as low as 300 pCi/L. The standard is expected to be established by
August, 2000.
The City's wells have not been tested for radon. However, because radon will be a primary
standard, the wells will have to be tested by the Minnesota Department of Health to
document compliance.
It should be noted that radon is easily removed by aeration or contact with the atmosphere,
since radon is a dissolved gas.
Uranium:
Although the City's water supply has not been specifically tested for uranium, gross alpha
test results, which include uranium, are approximately 1.2 pCi/L, which is far below the
proposed standard of 30 pCi/L for uranium. Therefore, uranium levels should be well
below the proposed standard.
Radium:
In 1976, the US EPA established a primary standard of 5 pCi/L for radium 226 and radium
228 combined. Due to a proposed relaxation to 20 pCi/L for each individual isotope, the
standard of 5 pCi/L has not been enforced in Minnesota since 1989. However, due to "anti-
backsliding" language in the 1996 Safe Drinking Water Act Amendments, it now appears
that the combined radium standard of 5 pCi/L will most likely remain in effect and be
reaffirmed in the year 2000. Regulatory enforcement plans and compliance periods are
unknown at this time.
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Radium 226 is an alpha emitter and is measured as a component of the gross alpha test.
Radium 228 is a beta emitter but is not measured as part of the gross beta test, as previously
discussed.
Based on the distribution system gross alpha concentration of 1.2 pCi/L, it can be concluded
that the distribution system concentration of radium 226 is something less than 1.2 pCi/L.
There is no data available on radium 228 concentrations in the City's wells.
The standard radionuclide testing protocol used by the Minnesota Department of Health is
to measure gross alpha, including uranium. If the gross alpha, including uranium, is less
than 5 pCi/L, it is then assumed that the combined radium is less than 5 pCi/L. This
assumption is based on nationwide ratios of gross alpha constituents in groundwater and
radium 226 to radium 228 concentration ratios. However, the concentration ratios can vary
significantly by location.
Without further testing, it cannot be determined if radium concentrations are within
acceptable limits. The assumptions on which the radionuclide testing protocol is based
would imply that radium concentrations are probably within acceptable limits, since the
distribution system gross alpha is under 5 pCi/L.
Since radium is a primary standard, each well will need to meet the standard, be blended with a
well low in radium, or be treated prior to being introduced to the distribution system. It should be
noted that radium can be partially removed by conventional iron/manganese filtration and softening
processes.
The discussion presented above indicates that the City of Prior Lake's water supply will likely meet
future U.S. Environmental Protection Agency Primary Standards for radionuclides. However,
nothing can be stated with certainty until the final rules for radionuclides are promulgated. The
radionuclide rules are scheduled to be finalized by November 2000 and the radon rules are to be
finalized by August 2000.
The Minnesota Department of Health will sample and test for radionuclides and radon to verify
compliance or non-compliance with the final radionuclide and radon rules.
Inorganic Chemical (IOCs)
Synthetic Organic Chemicals (SOCs)
Volatile Organic Chemicals (VOCs)
Microbiological Contaminants
The City of Prior Lake's water supply meets all of the U.S. EPA Primary Standards for these
contaminants. The Minnesota Department of Health samples and tests periodically for IOCs,
SOCs, and VOCs.
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5.2.14 Disinfectants/Disinfection Byproducts Rule (Stage 2)
The Preliminary Disinfectants/Disinfection Byproducts Rule (DBP) sets maximum residual
disinfectant levels for byproducts of the disinfection process. Organic byproducts from the
disinfection process such as trihalomethanes and haloacetic acids have been linked to a variety of
cancers.
Currently, only trihalomethanes (THMs) are included under the primary drinking water
standards. Total trihalomethanes (TTHMs) which is the combined concentration of four specific
compounds--chloroform, bromoform, bromodichloromethane, and dibromochloromethane--has a
current MCL of 0.10 mg/L. The DBP rule will regulate TTHMs and HAA5 which is the combined
concentration of five halo acetic acids--monochloroacetic acid, dichloroacetic acid, trichloroacetic
acid, monobromoacetic acid and dibromoacetic acid. The DBP rule will also regulate the residual
disinfectant levels of chlorine, chloramines, and chlorine dioxide.
The DBP rule is expected to be implemented in two stages. Stage I MCLs are expected to
be 0.08 mg/L for TTHMs and 0.06 mg/L for HAA5. Stage 2 MCLs are expected to be 0.04 mg/L
for TTHMs and 0.03 mg/L for HAA5. Since Prior Lake's water supply is groundwater, it is not
expected to experience any problems with disinfection byproducts which are generally associated
with surface waters or waters under the influence of surface waters.
5.2.15 Sulfate Rule
The 1986 amendments to the SDW A required that the EP A regulate sulfate. In July 1990,
an MCL of 400 mg/l was proposed.
There is no evidence that sulfate has any adverse chronic health effects in animals or
humans. High levels of sulfate are known to cause diarrhea and dehydration. But humans
acclimate to the high levels of sulfate over time. Because sulfate has no chronic health effects, EP A
decided to reconsider a regulatory approach for sulfate when Phase V was promulgated in July
1992.
Even if sulfate became a regulated contaminant, since Prior Lake has sulfate levels less than
15 mg/l, the City would easily meet the 400 mg/l proposed MCL.
5.2.16 New Contaminants
As part of the 1996 SDWA Amendments, Congress mandated that EPA develop a Drinking
Water Contaminate Candidate List (DWCCL). Primary Standards may eventually be adopted for
some of the contaminants on the DWCCL.
5.3 WATER QUALITY
The Minnesota Department of Health (MDH) coordinates and performs water quality
testing for each of the public water supplies in the State of Minnesota. These tests are to confirm
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that each public water supply is in compliance with the Safe Drinking Water Act (SDW A). The
MDH also tests for additional contaminants not yet regulated by the SDW A.
Selected water quality test results have been included in Appendix H.
Past water quality samples taken by the City of Prior Lake and the Minnesota Department
of Health were reviewed and compared to the current and proposed regulations. Because water
quality in groundwater is generally fairly constant with time, these samples are considered to be an
acceptable representation of the quality from each of the existing wells.
5.3.1 Primary Drinking Water Standards
Prior Lake's water supply does not exceed any of the MCLs currently established under the
Primary Drinking Water Standards.
5.3.2 Secondary Drinking Water Standards
Prior Lake's water supply is below the suggested maximum contaminant level (SMCL) for
all secondary contaminants for which data was available, except for iron and manganese. Both iron
and manganese may cause staining of clothing and plumbing fixtures, clogging of pipelines with
insoluble iron and manganese compounds, and growth of iron bacteria (Gallionella and Crenothrix)
which can create taste and odor problems.
Data was not available for several secondary drinking water standards including aluminum,
color, corrosivity, foaming agents and odor. Additional tests are recommended at each of the wells,
so that data will be available for all of the SMCLs.
The dissolved iron concentrations in the water samples from Wells No.3, 4, and 5 were
found to range from 0.09 mg/l to 0.51 mg/l. Only Well No.5 exceeds the 0.30 mg/l SMCL for
Iron.
The dissolved manganese concentrations ranged from 0.26 mg/l to 0.74 mgll. All three of
the wells equal or exceed the 0.05 mg/l SMCL for manganese.
The measured concentrations for both iron and manganese for each well are presented in
Table 5-2.
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.
3
0.10
0.74
4
0.09
0.26
5
0.51
0.29
Iron SMCL = 0.30 mg/l
Manganese SMCL = 0.05 mg/l
NOTE: Bold values exceed the SMCL.
SOURCE: City and MDH Test Records.
Although manganese is currently regulated as a secondary standard, the EP A is currently
considering changing manganese to a primary standard. The EPA is considering an MCL of 0.20
mg/l for manganese, based on health risk studies.
All three of Prior Lake's wells exceed the 0.20 mg/l MCL being considered by EP A. If
manganese were to become a primary standard, Prior Lake could no longer use the existing wells
without implementing a manganese removal treatment process for the wells.
At the concentrations in Prior Lake, manganese is relatively easy to remove, using a
manganese greensand filter. It should be noted that manganese has not been formally proposed as a
primary drinking water standard. Therefore it is difficult to know if manganese will become a
primary standard.
As noted earlier in this report, the City of Prior Lake feeds polyphosphates to sequester iron
and manganese. Since polyphosphate feed was initiated, customer complaints relating to iron and
manganese have dramatically decreased.
5.3.3 Fluoride
The fluoride concentrations do not exceed the MCL or SMCL and no problems are
anticipated with compliance.
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2f.-
";7"-
"....
5.3.4 Volatile Organic Chemicals
The contaminant levels at Prior Lake do not exceed the MCLs for VOCs currently regulated
under the SDW A. As long as the City monitors industrial sources to prevent contamination, no
problems are anticipated with VOC compliance in the future.
5.3.5 Coliform
The available test data on the presence/absence of coliforms at Prior Lake, conducted by the
Minnesota Department of Health, has shown an absence of coliforms in all three wells and the
distribution system. Because Prior Lake's supply is a groundwater not under the influence of a
surface water supply, no problems are anticipated with compliance.
5.3.6 Lead and Copper
Under the provisions of the Lead and Copper Rule, development of a sampling plan and
initial monitoring for lead and copper for medium size public water suppliers (3,301-50,000 people)
such as Prior Lake must have been completed by July 1992. If the action levels were exceeded,
corrosion control treatment was required. If the water system meets the initial monitoring
requirements, the existing treatment process is considered optimal for corrosion control, and the
water supplier may apply for reduced monitoring. Initial monitoring tests have been completed by
the MN/DOH. Second round testing has also been completed.
Based on initial monitoring phase testing and second round testing, lead and copper levels
in Prior Lake are below the action levels established by the EP A. This means that Prior Lake's
existing treatment process is considered optimal for corrosion control, and the number of sampling
sites and frequency of testing for lead and copper will be reduced.
5.3.7 Phase II SOCs and IOCs
Contaminant levels at Prior Lake are below the MCLs and SMCLs for all Phase II
contaminants which were tested.
5.3.8 Radionuclides
Prior Lake is likely in compliance with the radium standards, and does not exceed the gross
alpha and gross beta photon activity limits.
Of potential concern to the City is the Radon Rule. If the Radon Rule is promulgated at the
300 pCi/llevel, the City could possibly exceed this level. Although no radon test data is available
for the City, many of the metro area water suppliers that use groundwater have at least one well that
exceeds the proposed standard. As mentioned previously, the American Water Works Association
(A WW A) has expressed their concern that the proposed 300 pCi/L MCL for radon is unnecessarily
low based upon available data regarding treatment costs and known health risks.
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5.3.9 DisinfectionlDisinfection Byproducts
TTHM levels at Prior Lake are below the current MCL regulated under the Primary
Drinking Water Standards. Future TTHM MCLs will be lowered under the proposed Disinfection!
Disinfection Byproducts Rule. However, the TTHM levels at Prior Lake should still comply with
an expected Stage 2 MCL of 0.04 mg/l.
5.3.10 Phase V SOCs and IOCs
Contaminant levels at Prior Lake are below the MCLs for all Phase V contaminants.
5.4 SUMMARY
The current testing procedures of well samples has identified areas where treatment of water
may be necessary to meet acceptable contaminant levels. The most significant problem identified
in Prior Lake's system is the relatively high levels of iron and manganese, which may cause
problems within the distribution system if not treated.
A water treatment plant has been discussed and was previously described in Section 4.
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SECTION 6 EMERGENCY PLAN FOR PUBLIC WATER SYSTEM
6.1 INTRODUCTION
The purpose of the Emergency (contingency) Plan is to increase emergency preparedness
and to provide the City with a course of action to follow during conditions that require a
curtailment of water service. Potential situations that could reduce water service include natural
disasters such as drought, flood or tornado, or manmade conditions such as water source
contamination, and equipment and power failures. This Emergency Plan should be incorporated
into an overall City Emergency Plan that includes electrical power, police, and fire departments.
Emergency Plans were mandated by Chapter 186 of the State of Minnesota 1993
legislative session laws. An Emergency and Conservation Plan, prepared as a separate document
from the Comprehensive Water Plan, has been formulated to meet the requirements of Chapter 186,
Minnesota Department of Natural Resources (MN/DNR) and Metropolitan Council guidelines for
water emergency and conservation plans.
6.2 EMERGENCY TELEPHONE LIST
In case of an emergency condition, it is critical that the appropriate individuals and agencies
are contacted. An Emergency Telephone List is shown in Tables 6-1 and 6-2. The tables include a
list of the City staff and various community and agency contacts that potentially would need to be
contacted in case of a water related emergency.
Table 6-3 presents City staff who are part of the Emergency Event Evaluation Team, their
emergency assignments, and communities or agencies they are responsible for contacting in case of
an emergency. During an emergency condition, all available members of the Emergency Event
Evaluation Team will evaluate the condition, contact the appropriate agencies or communities, and
determine the best response to the emergency condition.
All three tables should be reviewed and updated yearly by the City.
The City should create an emergency response form that is available to City staff and
operators. When an individual contacts the City to report an emergency condition, this form would
ensure that all critical information is reported. Some items to be considered in the emergency form
include the following:
1. Name, phone number, and address of individual reporting the emergency.
2. City staff who took down the information, date and time emergency was reported.
3. Where is the emergency site; address or approximate location.
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4. A brief description of the emergency.
5. Any conditions at the site of which emergency staff should be aware?
6. Who else has been contacted regarding this emergency condition? Are these individuals
taking any type of action (such as calling other communities or agencies)?
7. Are there currently any emergency personnel on site?
8. Any other critical information?
The most likely short term emergency condition that will be faced by the Prior Lake water
system will be a power outage at the City's well field. All three of the City's wells are fed by non-
looped electrical systems. In the event that a line breaks or goes down, Northern States Power
Company (NSP) has no means to feed power to the wells from a different direction. Mr. Marcus
Hendrickson of NSP indicated that a temporary line could be laid on the ground to provide
temporary service should a line break or go down. Mr. Hendrickson indicated that the maximum
down time to do this would be four hours. If the City's elevated tanks are reasonably full at the
time the outage occurs, the reservoirs should be able to satisfy water demand until power is restored
and the wells start pumping.
In recognition of the water system's vulnerability to a power outage, the standby generator
that was provided as part of The Wilds Booster Station was trailer mounted and oversized to
operate a well. Well No.3 has been fitted with a manual transfer switch and generator receptacle.
In the future, should a power outage occur, Well No.3 can be operated with the standby generator.
The ability to operate Well No.3 during a power outage provides additional assurance that the
elevated tanks won't run dry during a power outage.
6.3 CURRENT WATER SOURCES AND SERVICE AREA
Each of the water sources (wells) and service area were described in detail in Sections 2 and
3 and will not be reiterated here. Refer to Table 2-1 for information on the wells.
6.4 PROCEDURE FOR AUGMENTING WATER SUPPLIES
Potential sources of water that can be used to augment or replace existing sources have been
examined and are presented below.
6.4.1 Interconnect with Adjacent Communities
Currently, there is one interconnection between Prior Lake and an adjacent community,
Savage. A watermain interconnection between the Savage and Prior Lake systems was constructed
at Boone Avenue in 1996. The overflow elevation of Savage's new high level elevated storage
tank is 16~ feet higher than Prior Lake's elevated storage tanks. Therefore, water from Savage's
high level pressure zone will readily flow into the Prior Lake system simply by opening the valve
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Tl'
..
between the two systems. Savage's new elevated storage tank has a capacity of 500,000 gallons.
The tank is fed by booster pumps, pumping from Savage's new 5MG ground storage reservoir at
the intersection of CSAH 16 and MTH 13. Because the booster station is equipped with standby
power, a power outage will not affect the reliability of the booster station to pump water from the
5MG ground storage reservoir. Therefore, Prior Lake will have access to an additional 5.5MG of
water in storage. This greatly improves Prior Lake's water system's ability to provide water during
a power outage.
Another connection exists between Savage and Prior Lake because of an agreement that has
been approved for Prior Lake to provide water and sanitary sewer services to the Cates Lake-Oak
Island Additions of Savage. These additions are located immediately adjacent to the City of Prior
Lake, southeast of Highway 13 and south of 150th Street.
Prior to the agreement, the residents in the Cates Lake Addition had their own wells and
septic systems. The City of Savage wanted to provide these residences with municipal water and
sanitary sewer. Savage did not have any watermains or sewer lines close enough to allow
connecting these additions to their own system, and for that reason they asked Prior Lake to provide
temporary service (not to exceed 10 years).
There are two watermain connections to the Prior Lake water system by the Cates Lake-
Oak Island Additions. One is an 6-inch diameter temporary connection and the other is a 12-inch
diameter permanent connection. Once Savage has extended its water system to reach the Cates
Lake-Oak Island Additions, the temporary connection will be disconnected and the valve to the
permanent connection will be closed. The permanent connection will allow future sharing of water
resources between the two communities after Savage begins supplying water to the Cates Lake-Oak
Island Additions.
Another potential interconnection would be The Wilds irrigation well. The well was
constructed in accordance with MDH requirements. Consequently, it could be used to supply water
to the City of Prior Lake under emergency conditions. However, to do so, a wellhouse, chemical
feed equipment, a booster pump and interconnecting watermain would be required. These items
would require a substantial capital investment for a relatively modest (800 gpm) emergency water
source. Considering that the City now has a standby generator to operate Well No.3 and has an
interconnection with the City of Savage, the expense of an interconnection with The Wilds
irrigation well is probably not warranted.
Shakopee does not have watermains close enough to Prior Lake to make an interconnection
a feasible option at this time.
6.4.2 Conjunctive Use of Surface and Groundwaters
There are two surface water sources that were considered as possible water sources for the
City-- the Minnesota River and the Spring LakeIPrior Lake chain of lakes.
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Minnesota River: The Minnesota River is located approximately three miles from the City
of Prior Lake's northern border. Using the Minnesota River as the source of supply for Prior Lake is
not a viable option at this time. There would be large capital costs associated with Minnesota River
water including a raw water pumping station, over three miles of large transmission main, and a
surface water treatment plant. Land would have to purchased in either the City of Savage or the
City of Shakopee for the raw water pumping station, and easements would have to be acquired
where the watermains would be routed.
In addition to the capital cost, there are water quality and quantity concerns. The Minnesota
River is a poor quality water source. The river collects nitrates, pesticides, and other contaminants
from several hundred square miles of farm land. Although the Minnesota River could potentially
provide water for any of the metro area communities through which it flows, none of these
communities use it as a water source because of the contaminants in the water. In addition, it
should be noted that the flow in the Minnesota River drops to very low levels under extended
droughts, such as the one that occurred in 1988.
The Minnesota River could become a viable source of water if either the City of Shakopee
or the City of Savage were to construct a surface water treatment plant using the Minnesota River
for raw water. Prior Lake could then become a wholesale purchaser of treated water, which would
reduce the costs associated with using Minnesota River water.
Prior Lake/Spring Lake: Use of this chain oflakes as a water source is highly dependent
upon the annual precipitation. During wet years, water is discharged from the lakes and there is
potential to use surface water from these lakes to supplement the existing groundwater supply
without impacting water levels in the lake. But during dry years, no water is discharged and use of
the lake water would drop water levels and generate complaints from lake residents and businesses.
Although there is potential to use surface water in conjunction with groundwater, the added costs to
install surface water treatment facilities means that the City would see small benefits for relatively
large costs. In Chapter 4, a cost estimate for an iron and manganese water treatment plant was
presented. A surface water treatment plant to treat lake water would cost approximately twice as
much.
For ultimate development conditions, the City of Prior Lake will consume approximately
one billion gallons (BG) of water in a dry year. Assuming that surface water from the chain of
lakes would be used to supplement the currently permitted appropriation of 400 MGY from the
Jordan sandstone formation, would indicate that 600 MGY of water would be withdrawn from the
chain of lakes. Based on 1,400 acres of surface area, this volume of water represents a 16-inch drop
in water level. This reduction in water level would likely generate numerous complaints from those
residents living on shallow bays.
6.4.3 Alternative Sources of Water
The Shakopee Mdewakanton Sioux Community (SMSC) has its own water system.
However, because the SMSC is a sovereign nation, the Minnesota Department of Health (MDH)
has no jurisdiction over the SMSC water system. Due to this fact, the SMSC water system may not
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Chapter 8
have been constructed to MDH standards that apply to the City of Prior Lake. Therefore, a
connection to the SMSC water system may not be appropriate. Also, it should be noted that the
SMSC wil1likely be faced with restrictions on the use ofthe Jordan aquifer. Of course, the SMSC
would be reluctant to sell water to Prior Lake should they be faced with these restrictions.
The Wilds development has a golf course irrigation system that includes a Jordan aquifer
well for water supply. The well meets MDH standards for a municipal water well. Therefore, it
could be used for water supply. However, due to its limited capacity (800 gpm) and the cost to
connect it to the Prior Lake water system, it is not recommended as an alternative water supply.
6.5 DEMAND REDUCTION MEASURES
6.5.1 Demand Reduction Potential
Priorities associated with reducing demand in an emergency follow, and are included in
Section 6.6 "Procedures for Water Allocation". Based on the priorities described in Section 6.6,
most water use in the City of Prior Lake is considered first priority. Peak summer usage is mostly a
result of sixth priority water use, such as lawn watering and vehicle washing. The best potential for
reductions in short term demand is associated with reducing summer peak use. This can be
accomplished through limiting or banning sprinkling and vehicle washing. Options for long term
reductions in demand are presented in Chapter 7 (Conservation Plan).
Limited data is available to make quantity or percent of demand reduction estimates
associated with implementing short term conservation measures. Considering that January use
should be almost entirely domestic use, most use in excess of that would be considered non-
essential use. July water use over the last seven years has averaged between 11 % and 163% greater
than the January water use. A rough estimate for demand reduction potential would be that perhaps
25%-40% of demand could be reduced during summer conditions.
6.5.2 Short Term Demand Reduction Procedures
In the event that a short term demand reduction is deemed necessary, the City's Emergency
Event Evaluation Team should meet and decide what measures to take. Following is a list of
potential reduction measures.
1. Voluntary Reduction Measures: Contact the media and issue a notice to the City that
there is an imminent water shortage and request a voluntary water reduction from
residents. This could include minimizing bath use, reducing shower length, and other
measures to reduce interior water use.
2. Sprinkling Bans: Instigate a total sprinkling ban in an extreme emergency. Sprinkling
ban ordinances should incorporate fines or penalties (such as water shutoff) for those
customers that do not comply.
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3. Water Allocation Restrictions: Based on the length and severity of the emergency
conditions, the various water use priorities defined in Section 6.6 should be
implemented.
6.6 PROCEDURES FOR WATER ALLOCATION
The following procedure for water allocation is recommended by Minnesota Statute
1030.261.
. First Priority. Domestic water supply, excluding industrial and commercial uses of
municipal water supply, and use for power production that meets contingency
requirements. According to MN Rules 6115.0630, Subp. 9, domestic use is defined as
use for general household purposes for human needs such as cooking, cleaning,
drinking, washing, and waste disposal, and for on-farm livestock watering excluding
commercial livestock operations which use more than 10,000 gallons per day.
. Second Priority. Water uses involving consumption ofless than 10,000 gallons per day.
. Third Priority. Agricultural irrigation and processing of agricultural products.
. Fourth Prioritv. Power production in excess of the use provided for in the contingency
plan under first priority.
. Fifth Priority. Uses, other than agricultural irrigation, processmg of agricultural
products, and power production.
. Sixth Priority. Non-essential uses. These uses are defined by Minnesota Statutes
1030.291 as lawn sprinkling, vehicle washing, golf course and park irrigation, and
other non-essential uses.
Allocation procedures should distribute water equitably within each water use priority and
customer category. Non-essential uses of water are the lowest use priority and will be the first
water use subject to allocation restrictions. Quick responses to restrict non-essential uses of water
during periods of limited supplies will help protect domestic and economic uses of water.
Water used for human needs at hospitals, nursing homes, and similar types of facilities
should be designated as high priority to be maintained in an emergency. Local water allocation will
need to address water used for other human needs at other types of facilities such as hotels, office
buildings, and manufacturing plants. Domestic use must have priority over economic needs.
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6.7 TRIGGERS FOR IMPLEMENTING PLAN COMPONENTS
An important part of reducing short-term demand is establishing triggers for implementing
the various components of the plan. To establish triggers, the existing water sources were
examined. The City is dependent on its wells as the water source to meet the water demand from
its customers.
The current average day demand is 1.3 MGD and the average maximum day demand for
the past seven years is approximately 2.9 times the average day demand or 3.8 MGD. The
combined storage of both elevated tanks is 1.75 MG. Based on the total volume of the tanks, the
1.75 MG can provide approximately a day of average day demand and about a half day at
maximum day demand. Tower level is critical to maintain pressure in the distribution system. The
most critical component of the Prior Lake system is the pumping capacity from its wells.
F or emergency conditions, the City should consider that the largest well pump is out of
service. This is referred to as the firm capacity. Prior Lake's firm capacity is 2,100 gpm (2.52
MGD) with its largest well (1,200 gpm) out of service. Triggers for implementing plan
components are based on firm capacity.
The triggers shown in Table 6-4 are guidelines to be considered by the Emergency
Evaluation Team in the event of an emergency condition that warrants a short term reduction in
demand.
6.8 ENFORCEMENT
The City of Prior Lake has a provision in its City Code (Chapter 4, Section 9-4-15) to
control sixth priority water use. Following is the provision as it appears in the City Code.
ODD-EVEN SPRINKLING BAN: Lawn or garden sprinkling, irrigation, car
washing and other non-essential outdoor use of the Municipal Water System
shall be restricted to an odd/even system in conjunction with an II :00 a.m. to
5 :00 p.m. ban effective May 1 through September 1. Residents with an odd
house number may water lawns or use an outside hose, when necessary, before
11 :00 a.m. and after 5 :00 p.m. only on odd numbered calendar days. Residents
with an even house number may water lawns or use an outside hose, when
necessary, before 11 :00 a.m. and after 5:00 p.m. only on even numbered
calendar days. This applies to all municipal water users. Exceptions shall be
made for landscaping, including newly seeded or sodded lawns, within the first
thirty (30) days of placement. Private wells used for irrigation shall be exempt
from these restrictions. Municipal water customers who have been notified of a
violation of these restrictions, and who violate them a second time, shall be
fined $25.00 for each day of violation. The fine shall be added to the
offender's next water bill. A third violation shall be cause for discontinuance
of water service. After payment of all outstanding bills, fines and connection
fee (as stated in city fee schedule), the water service shall be restored.
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A critical factor in an effective reduction in short term demand is enforcement. Police,
City staff, and concerned citizens can provide monitoring to ensure that all residents are
complying. Ordinances must include enforcement measures that will be incurred in the event that
a citizen doesn't comply with any water bans or restrictions implemented. Enforcement options
include fines and water shutoff.
As can be seen above, Prior Lake includes both fines and water shutoff as components of
the City's sprinkling ban provision. Although a twenty-five dollar ($25.00) a day fine may be
sufficient incentive for some customers, the City's more affluent customers may decide to continue
to water their lawns and pay the fines. Therefore, the City should consider raising the daily fine to
perhaps $50 or $100 dollars a day to ensure compliance by most of its customers.
Sprinkling bans are adequate for reducing sixth priority water use but there should also be
ordinances or provisions in the City Code that permit the City Council to restrict first through fifth
priority water use. These ordinances or provisions would allow for the quick implementation of
water use restrictions during a severe emergency.
6.9 WATER SUPPLY PROTECTION
6.9.1 Analysis of Previous Supply Problems
Available data provided by City staff indicates there were past supply problems during the
drought year of 1988 and the summer of 1997 when the odd/even sprinkling ban was
implemented. The odd/even sprinkling ban was implemented after periods of hot, dry weather
occurred and the wells were running continuously to keep up with sprinkling, irrigation and
washing demands. The new sprinkling ordinance has not been in effect long enough to see what
the long term impacts of it will be on lowering the maximum day ratio.
6.9.2 Wellhead Protection
The Minnesota Department of Health is currently preparing the requirements for wellhead
protection plans. In the interim, it is important that the City closely monitor that no incompatible
industries are located near the City's wells.
6.9.3 Resource Monitoring
The City should maintain records of water levels and withdrawals for tanks and production
wells. The DNR also recommends observation wells to assess short term and long term resource
impacts from groundwater withdrawals.
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.f
Pager
Number
447-4245
Greg Ilkka City Engineer 447-9831 758-5028 447-4245 790-0355
Doug Hartman Maintenance 447-9675 440- 7971 447-4245 534-6700 790-0356
Supervisor
Sue McDermott Assistant City 447-9832 447-4245
Engineer
Dave Chromy Fire Chief 440-3473 447-4245
Bill O'Rourke Police Chief 447-4230 447-1250 447-4245
After Hours 447-4241 447-4245
ADJACENT COMMUNITIES
Shakopee
Savage
Louis Van Hout
Utilities Superintendent
445-3650
882-2660
Dave Hutton
Public Works Director
LOCAL AGENCIES
Metropolitan
Council
Gary Oberts
Senior Planner
291-6484
MINNESOTA STATE AGENCIES
Dept. of Health Bassam Banat District Engineer for the Metropolitan 215-0750
South Area
DNR Jim Japs Coordinator, Water Appropriation Permit 297-2835
Program
Dept. of Public State Agency After Minnesota Duty Officer 649-5451
Safety Hours Contact
Comprehensive Plan 2020
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(2)
(2)
(2)
(2)
Greg Ilkka
Doug Hartman
Greg Ilkka
Doug Hartman
Greg Ilkka
Doug Hartman
Greg Ilkka
Doug Hartman
Emergency Event Evaluation Team
Community Contact - Shakopee
Community Contact - Savage
Community Contact - DNR
(2)
Community Contact - Dept. of Health
Greg Ilkka
Doug Hartman
(2) Greg Ilkka Community Contact - Metropolitan Council
Doug Hartman
(1) City to determine and list members of the Emergency Event Evaluation Team.
(2) City to assign individuals responsible for contacting the various communities and agencies.
Voluntary odd/even sprinkling ban (will reduce
6th priority water use).
Mandatory odd/even sprinkling ban (will
minimize 6th priority water use).
Total sprinkling ban (will almost eliminate 6th
priority water use).
When it is anticipated that demand will exceed
90% of firm well capacity (2.27 MGD).
When it is anticipated that demand will exceed
100% of firm well capacity (2.52 MGD).
Constrain 5th through 2nd priority water
allocation.
When it is anticipated that demand will exceed
110% of firm well capacity (2.77 MGD), or when
odd/even sprinkling does not keep demand
below 100% of firm capacity.
When total sprinkling ban does not keep
demand below 100% of firm capacity.
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SECTION 7 WATER CONSERVATION PLAN
7.1 INTRODUCTION
The purpose of the water conservation plan is to provide the City with a procedure for
optimizing the available water resources. Short-term water conservation can be accomplished by
implementing the emergency procedures presented in Chapter 6. Long-term water conservation
is an important part in managing available water resources.
7.2 ROLE OF CONSERVATION
An effective conservation program will increase efficient water use, decrease water
demand, and determine and address water loss and wasting water problems. By reducing the total
water use and increasing the efficiency of water use, a water utility can often postpone
development of new sources, and decrease operations costs such as energy (pumping) and
chemical costs.
Since peak demands can affect energy costs and storage requirements, the ultimate goal
will be to reduce peak water use.
7.3 WATER CONSERVATION POTENTIAL
Each of the City's customer categories has been analyzed to determine the best potential
for water conservation. During this analysis, it was determined that residential use accounts for
90% of the total, industrial/commercial use is 7%, and institutional use accounts for 3% of total
use. These water use percentages have been fairly consistent over the past ten years.
The residential customer category was selected as having the most potential for water
conservation because of the total water volume used and the potential for reducing peak use.
Another potential area for water conservation is unaccounted-for water use. Factors in
unaccounted-for water use include watermain leaks, unmetered connections, hydrant flushing,
and fire department use. The total potential for unaccounted-for water use conservation is
dependent on where the water is going. For example, there typically is little potential to reduce
fire department use.
7.4 WATER CONSERVATION PROGRAMS
As mentioned previously, water conservation can be accomplished through short-term or
long-term methods. The short-term methods were presented in Chapter 6 and will not be
reiterated here. Long-term conservation is accomplished by improving water use efficiencies.
Specific elements that should be considered in a long term water conservation plan are:
1. Metering
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2. Water Audits, Leak Detection, and Repair
3. Conservation-Oriented Water Rates
4. Regulation
5. Education and Information Programs
6. Retrofitting Programs
7. Pressure Reduction
These seven items are discussed as they relate to the City of Prior Lake.
7.4.1 Metering
The City's water customers are 100 percent metered. All customers read their own meters
once every two months and the City bills its customers every two months based on these
readings. The City periodically examines meters to confirm that customer readings are accurate.
The City has no program for recalibrating, testing, or repair/replacement of meters. The
City should consider implementing a meter maintenance program to ensure that all meters are in
working condition and accurately reporting water usage. Implementing these type of
maintenance programs will typically reduce the unaccounted-for water use.
7.4.2 Water Audits, Leak Detection, and Repair
Unaccounted-for water use is the difference between water produced and water sold.
Factors affecting unaccounted-for water use include meter under-registration, public unmetered
use (including fire use), recoverable leakage, and unavoidable leakage. As can be seen in Table
3-7, during the past ten years unaccounted-for water use has been approximately 10%.
The City currently has no formal leak detection or repair program. The City repairs
watermain leaks as they are discovered. Leak reduction could be accomplished by using leak
detectors. Leaks are typically detected using sonic detection equipment which amplifies leak
sounds, or with a correlator that uses a cathode ray tube to show any leaks that occur between
two locations.
7.4.3 Conservation-Oriented Water Rates
The City currently bills its customers once every two months on a uniform rate. The rates
are as follows:
Capital Facilities Charge
U sage charge
$7.50
$1.30 per 1,000 gallons
The current rate structure is intended to cover the costs associated with producing water
(including chemical costs) and maintaining the water system.
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'1
The City of Prior Lake currently bills its water customers bi-monthly (February, April,
June, August, October, and December). The water billing and sewer billing are based on water
meter readings. Sewer billing, however, is capped at 150% of the average water used during the
first three bi-monthly billings of the year. This billing procedure results in customers being
billed for both water and sewer for a portion of the water they use for lawn sprinkling. Because
the combined water and sewer billing rate is $4.15 ($1.30 for water and $2.85 for sewer) per
1,000 gallons, this billing procedure should be a strong incentive to limit lawn sprinkling.
However, the effectiveness of this billing procedure in reducing lawn sprinkling is questionable
because it is not readily apparent to the customer that they are being charged $4.15 per thousand
gallons for some of the water they use to sprinkle their lawns. More effective incentives to
reduce lawn sprinkling and conserve water would include increasing block rates, where the more
water used the higher the cost per 1,000 gallons, and seasonal rates which typically increase the
cost per 1,000 gallons during high water use months such as May through September.
7.4.4 Regulation
The Energy Policy Act of 1992 stipulates water efficiencies for almost all household
water using fixtures (including toilets, showerheads, and faucets) manufactured after January
1994. Federal and state plumbing codes have changed so that all new homes and retrofits to
existing homes are required to comply with the new water efficiency requirements. This
legislation will have a positive effect on long-term water demand.
As discussed in Section 6, the City has a sprinkling ban provision in the City Code
(Section 9-4-15, Chapter 4). There are no other ordinances or regulations to effect water
conservation in the City.
7.4.5 Education and Information Program
An ongoing public education program was started to help reduce water use and increase
water efficiency. The City of Prior Lake publishes a quarterly newsletter that provides
information to residents about upcoming events, environmental awareness, and other City
information. The City publishes at least one article per publication to educate the public on the
many aspects of water, including water conservation. Other methods used for public education
are school curriculums in which utility personnel talk with school children, who, in turn, often
pass on the information to their families. The City plans to develop a web page in the near
future. Once this occurs, and a City web page is established, water conservation and educational
material can be posted and updated as needed for public viewing.
Education programs attempt to change people's habits and can inform residents to reduce
shower durations, turn off water while brushing their teeth, and run dishwashers and clothes
washers only when they are full. Educational pamphlets regarding landscape water use, such as
those provided free of charge from the University of Minnesota Extension Service, can provide
residents with the information to change their landscape watering habits.
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7.4.6 Retrofitting Programs
As covered in Section 7.4.4, the Energy Policy Act has changed the required efficiency of
various water fixtures manufactured after January 1994. The replacement of existing fixtures will
occur gradually over the years as customers, of their own free will, replace old low efficiency
fixtures.
A WW A has estimated that "Based on the combination of fixtures of different ages now in
use, the average 2.63 person household uses about 121 gallons/day for toilets, showerheads and
faucets. This will probably drop to about 55 gallons/day by the year 2026 as the pre-1994
generation of fixtures is replaced by the post-1994 stock."
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\
Table 7-1 shows the potential water savings associated with various fixture replacements.
Flush (gallons) 5 3.5 1.6
Water use (gpcd) 20 l4 6.4
Faucet (2)
Flow (gpm) 3 2.8 2.5
Water use (gpcd) 9 8.4 7.5
Shower (3)
Flow (gpm) 4 2.8 2.5
Water use (gpcd) 20 14 12.5
Total Water Use Per 49 36.4 26.4
Person (gpcd)
Total Water Use Per 127.4 94.6 68.6
Household (gpcd) (4)
Potential Savings if
Retrofitted with New 58.8 26 0
Fixtures
(1) Based on 4 flushes per person per day
(2) Based on 3 minutes of faucet use per person per day
(3) Based on 5 minute of shower use per person per day
(4) Based on 2.6 persons per household for Prior Lake low density housing.
Actual water use will vary by person and by household.
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7.4.7 Pressure Reduction
By decreasing the system pressure in a water system, the flow rate (gallons per minute) is
decreased. Ten States Standards recommends that normal operating pressure in the distribution
system be approximately 60 psi and not less than 35 psi, and that during fire flow conditions, all
points in the system maintain a minimum pressure of 20 psi.
City data indicates that the water system normal operating pressures range between 50
and 100 pounds per square inch (psi). In areas where there is excessive pressure, the City
requires installation of pressure reducing valves.
Pressure could also be reduced by operating the water towers at a lower level. This is not
recommended, however, because it would reduce the volume of water available for fighting fires.
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.. fl"
SECTION 8 WATER RATE AND TRUNK CHARGE REVIEW
8.1 WATER RATES
8.1.1 General
A public water utility is one of the few areas of local government that bills directly for the
services that they provide to their customers. A water utility must generate funds to cover the
costs associated with operation and maintenance of the system and construction of new facilities
to improve and expand the system.
Operation and maintenance costs include the following:
1. Salaries and benefits for the utility personnel who operate and run the system.
2. Chemical costs to treat the water to meet federal and state drinking water legislation.
3. Energy costs associated with pumping the water, and heating and lighting water
treatment and pumping facilities.
4. Equipment and material costs to repair and replace damaged or obsolete equipment.
New facility construction typically includes new wells, pumps, well houses, treatment
plants, and watermains.
A water utility typically uses money from customer billing, water connection fees, trunk
funds, and various miscellaneous fees to recover costs.
Often, a water utility will bond for new capital facilities that are needed to expand and
improve the water system. Investors require that the water utility be a viable entity that is
profitable before they will buy bonds from the water utility. A profitable utility is an indication
to the investor that there will be funds available to repay the bond debt. Therefore, it is desirable
for a water utility to be profitable so that it has the ability to use bonding as a way to finance
capital improvements.
8.1.2 Existing Cost Recovery System
The City of Prior Lake uses several funds to recover water system costs including water
sales, trunk charges, connection charges, and meter sales. Every billing cycle, a capital facilities
fee is charged to each customer. This fee is to pay for the financing of the new Public Works
Maintenance Facility.
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The existing billing structure is the same for all customers. Water billing is six times a
year. Each billing cycle, every customer is charged $1.30 per 1,000 gallons and a $7.50 capital
facilities charge.
The City accounting system places water and sewer-related operating revenue and
expenses into the same fund. We have separated out the water operating revenue and expenses
for the last five years and have presented them in Table 8-1. For combined funds, such as for
connection charges, we made the assumption that half was water-related and half was sewer-
related. It should be noted that, prior to 1992, the water and sewer rates were both $1.40 per
1,000 gallons. In 1992 the City restructured their rates so that water rates would cover water-
related expenses, and sewer rates would cover the sewer-related expenses. As of January, 1999,
the water rate is $1.30 per 1,000 gallons.
As can be seen in Table 8-1, the Water Department currently generates sufficient revenue
to cover the annual expenses.
8.1.3 Recommendations for Future Water Rates
As shown in Table 8-1, the existing water rates are generating sufficient revenue to
operate the water system. A rate increase from $1.15 per thousand to $1.30 per thousand went
into effect in 1999. This rate increase should generate an additional $30,000 to $35,000 in
annual revenue.
An additional well (Well No.6) is scheduled for 1999 or, at the latest, in 2000. The
construction cost of the well has been estimated at $665,000. Assuming that 20-year bonds will
be sold at a 5% interest rate to finance the well results in an annual debt retirement amount of
$53,360. The current rate structure should generate sufficient money to defray this debt
retirement amount.
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Personal Services $199,284 $182,698 $155,025 $139,096 $130,240
Supplies $29,266 $31,770 $54,132 $58,706 $43,480
Repair and Maintenance $124,312 $98,156 $28,044 $7,022 $3,606
Professional Services $16,424 $14,092 $12,266 $2,588 $959
Insurance $1,330 $1,560 $3,102 $2,687 $2,335
Utilities $54,893 $67,553 $45,596 $40,552 $39,642
Other $12,627 $6,019 $185 $11,524 $12,028
Total Operating Expenses $438,136 $401,848 $298,350 $262,175 $232,290
Depreciation $101,448 $260,000 $246,133 $117,207 $115,898
Total Expenses with Depreciation $539,584 $661,848 $544,483 $379,382 $348,188
WATER OPERATING
REVENUES
Water Sales $510,667 $476,544 $409,838 $355,087 $342,744
Connection Charges $59,118 $106,650 $77,475 $72,801 $48,650
Total Revenues $602,734 $625,197 $510,733 $461,270 $417,234
CREDIT (debit) $63,150 ($36,651 ) ($33,750) $81,888 $69,046
A water treatment plant has been included in the 5- Year Capital Improvement Plan. The
construction cost of the plant has been estimated at $6.336 million. Assuming that 20-year bonds
will be sold at a 5% interest rate to finance the water treatment plant results in an annual debt
retirement amount of $508,400. Operating the water treatment plant will increase the Water
Department's operating costs by approximately $25,000 per year. If debt retirement and the
increased operating costs are to be recovered by water sales revenues, the City of Prior Lake
would have to increase water rates by approximately $1.50 per thousand gallons.
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8.2 TRUNK CHARGE SYSTEM
8.2.1 Current Method of Financing Trunk Charges
New watermains for the Prior Lake water system are, in general, installed by developers.
The developers determine the size of watermains they need for a given development, and then
the City conducts a review of the developer's plans. The City modifies the developer's plans in
those locations where the City needs larger mains for serving other areas. The developer is
reimbursed by the City for the additional cost associated with oversizing. The costs for
oversizing is paid out of the City's trunk reserve fund.
8.2.2 Future Trunk Charge Recommendations
Typically, any watermain over 8 inches in diameter is considered oversized. The City
pays the developer the difference in bid prices between 8-inch main and the oversized main.
The trunk reserve fund is financed by water availability charges (WAC), sewer
availability charges (SAC), and a per-acre trunk charge to develop. A $600 WAC and a $600
SAC (1999 fees) are assessed to the owner of each new water or sewer connection in the City at
the time a building permit is issued. One-half of each charge is placed in the trunk reserve fund.
The other half is placed in the water and sewer fund. The 1999 per-acre trunk charge for water
and sewer is $3,500/net acre.
8.2.3 Future Trunk Main Costs
The future proposed trunk mains, 12-inch and larger, were presented previously in
Chapter 4 and are shown on Exhibit 4-1. Opinions of construction costs for these mains have
been prepared and are presented in Tables 4-4 and 4-5. Since the City only pays for oversizing
of the watermains, the difference in cost between the trunk main size and 8-inch pipe is also
included in Tables 4-A and 4-5. It has been assumed that a negligible amount of lO-inch main
will be needed to build out the Prior Lake water system. Therefore, the remaining trunk system
costs which must be financed from the trunk reserve fund is the oversizing cost presented in
Tables 4-4 and 4-5.
It is anticipated that future funds available for financing ofthe trunk mains and oversizing
will come from the future WAC and acreage trunk charges. Total future WAC funds were
determined by estimating the remaining number of connections and multiplying by $300. The
$300 is the one-half of the 1999 WAC that goes to the trunk fund. Since the number of people
per connection has been dropping over the years, it was assumed that the 1994 figure of 3.25
people per connection would give a conservative number of future connections. Based on the
difference in population between the 27,400 person 2020 population and the 1997 14,319 person
population, approximately 4,000 connections were assumed. Therefore, total trunk reserve funds
available from the WAC would be approximately $1,200,000.
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Future trunk watermain costs were previously presented in Tables 4-4 and 4-5, which
outline the costs for the proposed 5-year and 20-year capital improvement plans. The total City
cost for trunk watermains and oversizing was estimated at approximately $2,060,000. This is
$860,000 more than the projected WAC revenue. Assuming that $1,750 of the $3,500/net
developable acre trunk charge is available for watermain construction results in the conclusion
that the City would only have to collect trunk charges on 640 net developable acres to collect the
$860,000 in additional revenue that is needed. Obviously, far more acreage' than that will be
developed to accommodate a population growth of approximately 13,000 persons.
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SECTION 9 HYDRANT FLUSHING PROGRAM
9.1 GENERAL
The City of Prior Lake, like most water suppliers, conducts hydrant flushing to improve
water quality, reduce customer complaints, and extend the life of distribution mains.
Historically, iron and manganese have generated most of the complaints in the City.
These complaints have been reduced substantially since the City implemented the use of
sequestering agents (polyphosphates) into the water system. However, sequestering agents are
subject to degradation with time and temperature. After a period of time, the sequestering agents
deteriorate, and the iron and manganese oxidize and form into a precipitate (or particle). These
precipitates can collect on the walls of the watermains. With changes in flow rate or direction,
the precipitates are stirred up and delivered to customers, causing complaints. Flushing cleans
out the inside of the watermains, minimizing the amount of particulate available to cause water
quality complaints.
Since flushing stirs up the system, water quality complaints typically increase during
flushing. Complaints during flushing can be minimized by conducting flushing during the night
and by notifying customers when flushing will occur. Customers are also less likely to call and
complain about their water if they have been educated about the benefits and possible side effects
of flushing (i.e. dirty water, reduced pressures, etc.). Bill stuffers or articles in the local
newspaper with the pertinent information are effective methods of informing customers of a
hydrant flushing program.
9.2 CURRENT FLUSHING PROGRAM
Prior Lake conducts a City-wide hydrant flushing twice a year, once in the spring and
once in the fall. Hydrant flushing is also performed year-round to address periodic water quality
complaints. The complaint-generated flushing is usually in low flow areas, particularly dead
ends on new developments that are subject to stagnant water.
The flushing sequence in Prior Lake has varied little over the last 15 years. Flushing
begins at the hydrants adjacent to the wells, moves out from the wells to the downtown, moves
north across the lake, and then proceeds around the lake. During one of the most recent
flushings, two utility crews were available, and the flushing sequence only changed to the extent
that one crew proceeded clockwise around the lake and the other crew proceeded counter-
clockwise around the lake. This program sped up the flushing and thus minimized the number of
flushing-related complaints.
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9.3 PROPOSED FLUSHING PROGRAM
The City's current practice of starting flushing at the water source, moving out into the
distribution system, and ending at the dead-ends is the method recommended by the American
Water Works Association. This methodology is the most effective in preventing particulate from
getting back into the mains that have already been flushed.
We do not recommend that the City change the general sequencing of its flushing
program. We recommend that the City consider the following to improve the effectiveness of the
flushing program. Some of these recommendations have been excerpted from the American
Water Works Association Research Foundation's book, "Implementation and Optimization of
Distribution Flushing Programs".
1. Create a fire hydrant database. The database should include a unique number for each
hydrant, hydrant location, any information from hydrant testing including time to
clear, water quality test data such as iron and manganese concentrations, special
comments, etc.
2. The time to clear should be recorded for each hydrant during each flushing. These
values can be used to compare flushing programs.
3. Water used to flush a main should originate from a main that has already been flushed
or from a main large enough to resist being stirred up by increased flow.
4. A larger main should not be flushed from a smaller main. The velocity reduction in
the larger main will decrease the effectiveness of the scour.
5. The amount of water used in flushing should be estimated and permanently recorded.
This procedure will assist the City in efforts to account for water, to compare the
volume used for previous flushing programs, and to determine costs for flushing.
V olume estimates can be made by clocking the time the hydrant is flowing, and by
using a pitot tube to measure flowrate.
Since one of the main objectives of flushing is to remove the particulate in the
watermains, the City should try to minimize the amount of particulate. This can be accomplished
by preventing particulate formation by sequestering, which holds the iron and manganese in
solution. The City's implementation of sequestering has reduced particulate formation.
Switching to a liquid polyphosphate, as the City did, has improved the efficiency of
sequestering. The best method of reducing the particulate loading in the water system is to use
water treatment, such as filtration. Filtration removes the iron and manganese before they can
enter the system.
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Another critical factor in the particulate loading of a distribution system is the pH of the
water. Using the pH and the saturation pH, a utility can determine if its water is neutral,
corrosive, or scale forming. Corrosive water can eat away at metal or lining of a watermain.
Scale forming water will precipitate out particulate, often causing a calcium carbonate scale to
form on the inside of the main. Calcium carbonate is cement-like material that can reduce the
effective size of the watermain as the scale builds up. Scale forming waters create more
particulate in the distribution system and thus more particulate that needs to be flushed out.
Sequestering agents such as the polyphosphates that the City uses affect the pH of the water. The
City should try to optimize the effectiveness of the sequestering while minimizing the scale
forming tendency of the water. Most suppliers of sequestering agents will provide assistance to
their customers to determine the optimum dosage of the chemical to maximize performance. A
local water testing laboratory can be used to determine the stability (corrosivity or scale forming
tendency) of the water by conducting pH and saturation pH tests.
9.4 RECOMMENDATIONS
The City's current flushing program follows recommended flushing methodologies and
appears to help reduce water quality complaints. To improve the flushing program will require
creation of a database and organization of new flushing program methods. The database will
provide the City with an existing system by which they can compare any changes in the flushing
program. Flushing costs, including the labor hours and water costs, must also be included in the
database.
Once the database has been established, the City may wish to consider making some of
the following changes:
1. Establish water quality parameters as a measure of the effectiveness of the flushing
program. Parameters to be tested for before and after flushing could include chlorine
residual, iron and manganese concentrations, and color.
2. Using the water quality parameters, switch frequency of flushing and see if any
improvements occur. For example, decreasing to flushing once a year may not result
in any noticeable change in water quality or number of complaints. Therefore, it
would then be worthwhile to decrease flushing frequency, saving the City the costs
associated with a second flushing.
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