HomeMy WebLinkAbout11/15/05
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MINUTES OF THE LAKE ADVISORY COMMITTEE
November 15, 2005
I. CALL TO ORDER
The Lake Advisory Committee (LAC) Meeting was called to order at 6:00 P.M.
Members present: Harry Alcorn, Marv Mirsch, Donna Mankowski, and Dan
O'Keefe, James Marchessault, Charlene Jasan
Others present: Judd Harper, Lake Minnetonka Conservation District (LMCD);
Steve Berg, Private Citizen; Ross Bintner, Water Resources Engineer; Larry
Poppler, Assistant City Engineer.
II.
CONSIDER APPROVAL MEETING MINUTES
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Mirsch made a motion to approve the October 18th meeting minutes, Alcorn
seconded that motion. The motion was approved with James Marchessault
abstaining.
III.
NEW BUSINESS
A. Dock Roundtable
i. Current state of rules and enforcement for Prior Lake
Pop pier explained that currently the city has a hands-off approach to
regulating docks, deferring to the old DNR rules. Questions have
come in to various levels of City staff as well as the LAC and City
Council regarding dock issues.
ii. Introduction of Judd Harper & explanation of his organization.
Harper explained his organization was created under state law and
has the authority to levy monies from the 14 municipalities that
surround Lake Minnetonka. Each City Council appoints 1 member
to the Board, totaling 14 members. Harper explained that in the
early days his organization dealt with pollution, but recently focus
has been more intensive on regulating docks and riparian rights.
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iii. Boat density and dock regulation discussion.
Harper explained the distinction between restricted and unrestricted
watercraft in the LMCD. Restricted watercraft (generally over 10hp
or 16' in length) All information on rules and regulations can be
found at www.lmcd.org. Homeowner may have up to 4 restricted
watercraft docked, but all must be licensed to the homeowner. If the
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homeowner wishes to rent a dock, the total number of restricted
craft would be 2. If over 4 boats are kept on site, the lot must have
at least 50' of shoreline for each boat. (e.g 300' shoreline would
sustain a maximum of 6 craft)
Harper explained that docks have setback requirements from
property lines projected into the lake. Mirsch asked what rights the
LMCD was allowed to regulate on a public water, Harper explained
that LMCD has been upheld in court and cited an example of a
marina that had a 500' long dock that was made to be 200' at
maximum. The courts cited "reasonable regulation of public
waterways."
Sight lines were discussed by the commiSSion as well as new
canopy structures and the LMCD regulations dealing with them.
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Harper explained that LMCD uses imaginary extensions from
shoreline property lines, and uses a series of setbacks from these
extensions to regulate dock placement. Generally 10' offsets for the
first 50' and 15' offset from 50-100' from the Ordinary High Water
level (OHW) (See Attachment) Mirsch asked how the LMCD treats
lots that were platted to somewhere above OHW and technically
does not own shoreland. Harper admitted that this is a grey area for
the LMCD, however it is administered assuming the property lines
extend into the water.
iv. Enforcement of ordinance.
O'Keefe asked how LMCD enforces their ordinances. Harper
explained that most enforcement is complaint-based. Lakeshore
homeowners can agree to let their neighbors put docks in setback
areas, or agree to share a dock on a lot line, however if one of the
homeowners decides to revoke this permission, it can cause the
rules to be enforced again. O'Keefe asked what legal actions can be
taken against people who refuse to comply. Harper detailed a
range of examples including criminal court actions used by the
LMCD resulting in monetary fines. Harper explained that they prefer
to try simple mediation and explanation of rules to prompt voluntary
compliance.
Poppler asked how much of LMCD time was taken to administer
dock ordinance. Harper explained that 35-40 hours per week of
staff time were used even in the winter. Poppler asked about the
relative size of Minnetonka to Prior. Harper responded that
Minnetonka has 125 miles of shoreline.
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Mirsch asked about the procedure was for complaints of setback
infringement when a property line was in dispute. Harper explained
that if a survey is required the complaining party is not asked to get
a survey and that the LMCD would in cases pay for a survey.
Alcorn asked what records are kept in decisions made by the board.
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Harper explained that every decision and variance made by the
board is kept.
SUMMARY OF LMCD:
. Mlnnetonka has 125 miles of shoreline (Upper and
Lower Prior Lake have 24 miles of shoreline)
. Staff 3-4 persons, 14 Person Board.
. Enforcement is complaint based.
. 40 hours a week staff time for dock ordinance
enforcement.
· Every four years a lake use study is performed by
consultant
. Perform yearly boat count.
. Boat number restricted, not dock number
. Maximum dock length, 200'.
. Maximum dock width, 8'.
. LMCD hires surveyor for contentious lot line Issues.
. 10' to 15' setbacks for docks from property line
extensions.
. Permits required for rules variances.
. Variances are approved by board and are recognized
with property title.
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v. Top issues facing LMCD now:
Alcorn asked about the top issues facing the LMCD at this time.
Harper listed the following
. Slip rental and total number of boats.
. Increasing dock dimensions.
. Dock placement and setback Infringements.
. Boats used as storage facilities
. Winter deicing.
O'Keefe excused himself and temporarily appointed Mirsch chair.
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B. Scuba Lake Clean-UP
i. Steve Berg of 3193 Vail Cr SW introduced himself
ii. Minnetonka Experience
Berg explained that he attended a scuba cleanup event on Lake
Minnetonka and that he was interested in helping start a similar
event on Prior Lake. Berg explained that the Minnetonka event
occurs between 6am-Bam on a weekend in June. The event is held
early to avoid boat traffic and safety hazards of midday traffic.
Members are required to sign a waiver form. The event has
sponsors ranging from waste haulers, host restaurants, scuba
shops, and private citizens. T-shirts are made and the event is
promoted in local newspapers. The lake association organized the
Minnetonka event. Approximately 70 divers participated in the 4th
annual event this year and multiple tons of garbage were hauled
away. The event was organized like a contest with the prizes
coming from the sponsors of the event. Prizes were given for the
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Most garbage, largest item, most valuable item, etc. A dive master
gave instruction before the event at a central location discussing
safety and procedures of the event. The diving community enjoyed
the event as a get together to meet and socialize.
iii. Prior Lake Experience
Berg has been scuba diving in Prior Lake and explained what he
has seen. Berg told of a wooden boat at the bottom of Candy Cove,
layers of cans and bottles, beach towels, dock debris, auto parts,
and miscellaneous plastic waste. Mirsch related that he conducted
a cleanup of his beach and near shore area and was surprised at
the amount of debris that was found in such a small area. Items
found literally included a kitchen sink.
iv. Questions & possible plan of action
The Lake Association will discuss the possibility at their meeting.
Berg said he would coordinate with Mankowski who is also a Lake
Association member to come up with a plan for review at either the
December or January meeting. The LAC agreed to help Berg In
coordination efforts for a scuba dive clean up event in Prior
Lake.
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IV.
OLD BUSINESS
V. ANNOUNCEMENTS
VI. ADJOURNMENT
THE MEETING WAS ADJOURNED AT 8:00 P.M.
Respectfully submitted,
Ross Bintner
Water Resources Engineer
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Dock Use Area
Page 1 of 4
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Lake Minnetonka Conservation District
AUTHORIZED
DOCK USE AREA
Lake Minnetonka Conservation District
18338 Mlnnetonka Blvd.
Deephaven, MN 55391
Phone: 952-745-0789
Fax: 952-745-9085
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Reaulatlons
The following is a Synopsis of the LMCD dock and boat storage rules for
residential properties. For a full copy of the rules please see Chapter 2 of
the LMCD Code or call the LMCD office.
ADDlicatlons
Exotic;l
ReDOrts.
Links
No person shall use any area of the lake outside an authorized "dock use
area (DUA)", for docks, moorings, watercraft, storage, swimming floats,
ski jump storage, or diving towers unless specifically permitted.
Contact Us
Site MaD
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DI$claimer
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DUA Lenath
(measured from the 929.4 NGVD)
The length of a dock use area is equal to the property
shoreline length with a maximum of 100 feet.
Sites in existence on February 5, 1970 with lake frontage of 40
- 60 feet may have a dock extending up to 60 feet into the
lake.
Sites 40 feet or less may extend to reach a water depth of 4
feet (not to extend beyond 60 feet).
DUA Width
portion within setbacks measured from extended side property lines into
the lake.
For that portion of the length or the authorized dock use area which
extends from the shore:
50 - 100 foot
110 foot setback -I
115 foot setback
o - 50 foot
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Canopies require a 20 foot setback from the extended property line.
Side opening slip (Boat parked parallel to shore) setback shall be at least
http://www.1mcd.org/pages/dock_use_area.htm
11/15/2005
Dock Use Area
Page 2 of 4
equal to the slip depth (not less than 20 feet).
Lots with 50 feet or less of shoreline in existence on February 2, 1970,
need a 5 foot setback.
pock Structure
May not exceed 8 feet in width.
Permanent docks require a permit from the LMCD.
Example of Dock Use Area
http://www.lmcd.org/pages/dock_use_area.htm
11/15/2005
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Watercraft Density Restrictions
Page 3 of4
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No person shall use any area of the lake outside an authorized dock use
area, for docks, moorings, watercraft, storage, swimming floats, ski
jump storage, or diving towers unless specifically permitt
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Restricted Watercraft Definition
any boat or vessel for use on or stored on the public waters of the Lake
except for unrestricted watercraft as defined below.
http://www.lmcd.org/pages/dock_use_area.htm
11/15/2005
Dock Use Area
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Page 4 of 4
Number of Restricted Watercraft allowed:
2 restricted watercraft may be kept within a dock use area
for most lots.
4 restricted watercraft may be kept within a dock use area
provided all of the following conditions are meet:
. Single family residential structure on the lot
. All restricted watercraft kept at a dock or
mooring must be owned by and registered to
persons who live in the residential structure.
5 - or more may be allowed provided there is 50' of
shoreline at the lot for each restricted watercraft. A lot with
5 or more restricted watercraft must have a multiple dock
license with the LMCD.
Unrestricted Watercraft Definition
any boat or vessel for use on or stored on the public waters of the lake
which is:
16 feet or less in length and unmotorized; or
16 feet or less in length and which uses a motor of 10
hoursepower or less; or
20 feet or less in length and unmotorized, and which is
propelled solely by human power.
Number of Unrestricted Watercraft Allowed:
Residents can have any number of unrestricted watercraft
within the dock use area.
Residents should check with their City for any additional
restrictions to the above.
http://www.lmcd.org/pages/dock_use_area.htm
11/15/2005
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TO: Steve Albrecht, City Engineer
Bud Osmundson, Public Works Director
cc: Mayor and City Council
Frank Boyles, City Manager
Lake Advisory Committee
FROM:
Larry Poppler, Assistant City Engineer
Chloride Sampling Update
RE:
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The sampling results including the mean chloride content are attached on the
following page.
Minnesota State Rule 7050.0222 assigns a quality standard for Class 2A
waters, which would include Prior Lake. The chronic standard for chloride in
Class 2A waters is 230 milligrams per liter. The "chronic standard" is the
highest water concentration of a toxicant to which organisms can be exposed
indefinitely without causing chronic toxicity. If the standard is exceeded, it is
considered indicative of a polluted condition which is actually or potentially
deleterious, harmful, detrimental, or injurious with respect to the designated
use.
A study done by MnDOT in 1994 lists an MPCA chloride standard for surface
waters as such:
High quality recreational waters (2A) = 50 mg/l chloride
High quality industrial waters (3A) = 50 mg/l chloride
Good quality industrial waters (3B) = 100 mg/l chloride
A five-year study conducted my MnDOT, which began in 1982, on 13 metro
area lakes that receive highway runoff resulted in a mean average of BB.3
ppm chloride content.
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G:\Water_Bodies\lake water quality\Chloride Sampling\chloride memo generic. DOC
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Typical chloride concentrations of various waters are:
Tvoe of Water
Rain Water
Spring Water
Deep Well Water
Sea Water
City Well Water Testing
Chloride Content (oom or mall)
2
25
50
20,000
3.2
The Minnesota Pollution Control Agency prepared a report entitled
"Minnesota Lake Water Quality Assessment Data: 2000", published October
1999. Prior Lake is located in the North Central Hardwood Forests eco-
region. The summer average Chloride (mg/l) content for non-urban lakes in
this region is 4-10 ppm.
CONCLUSION
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Reviewing the various standards and concentrations that have been
established, the mean for Prior Lake is a good level for a highly used metro
lake.
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PRIOR LAKE CHLORIDE MONITORING RESULTS
SAMPLE LOCATION
ON CHLORIDE IN mgJL
I Februarv 24. 2001 43.4 42.8 39.4 38.7 372 40.1 37.2 37.1 36.5 33.1 34.2 332 372 36.5 37.6
I March 23. 2001 39.6 42.5 44.3 35.4 40.5 38.9 39.6 36.3 37.6 43.3 39.1 33.4 30.8 71.3 632 42.6
I May 1, 2001 32.9 31.8 30.8 31.6 30.9 31.4 30.8 29.9 30.6 28.4 28.6 28.8 28.5 30.7 30.7 30.3
I May 30. 2001 332 31.3 32.2 32.8 322 32.4 32.7 31.2 30.9 31.1 31.6 30.6 30.5 32.0 31.6 31.7
IJune 29. 2001 33.8 33.0 33.1 32.8 32.6 32.6 33.1 31.5 31.4 30.6 30.1 302 302 302 30.6 31,6
JulY 30. 2001 34.8 36.1 36,0 36.0 34.7 35.4 35.3 32.8 332 31.6 31.6 322 312 33.6 32.9 33.8
~tember 5. 2001 36.6 37.0 37.9 35.8 35.1 35.8 35.9 32.3 31.8 30.2 31.9 31.7 32.1 33.4 33.0 33.9
September 27. 2001 34.5 52.7 37.3 36.3 342 34.6 35.8 31.2 33.0 30.6 30.8 30.6 31.6 30.3 30.0 342
November 1. 2001 37.9 44.9 41.7 37.6 38,2 38.0 38.3 34.8 34.4 34.8 34.3 34.2 34.7 33.8 34.3 36.7
November 30. 2001 36.8 37.6 49.2 36.4 36.6 37.1 36.6 32.7 32.4 32.6 32.6 33.4 33.2 33.6 35.7
I Februarv 1. 2002 40.3 44.0 45.0 38.6 38.3 37.8 42.9 36.6 36.5 33.8 34.7 34.1 35.9 42.9 41.9 38.8
'March 1. 2002 39.0 82.0 85.0 35.4 41.3 34.0 39,0 29.7 34.5 33.2 35.5 34.1 36.4 36.8 39.4 42.6
I!'POI. 2002 (No tests taken) 0.0
I May 8. 2002 38.3 38.4 39.3 38.8 38.1 38.1 38.0 32.5 33.3 33.1 32.4 32.3 33.1 43.8 43.9 36.8
IJune 11. 2002 42.8 54.8 52.8 41.0 40.2 41.4 41,1 35.4 34.7 35.0 34.5 35.0 34.9 54.5 53.5 42.1
~17.2oo2 40.1 40.1 40.0 38.6 38.5 37.5 38.1 33.5 33.5 32.0 32.3 32.1 32.3 56.3 55.9 38.6
Auaust 9. 2002 39.3 38.7 38.6 37.8 37.9 37.5 37.6 32.7 32.6 32.5 32.7 34.2 32.6 46.5 38.1 36.4
September 4. 2002 31.7 32.4 322 32.8 30.4 30.1 30.5 30.2 31.9 30.1 312
I October 2. 2002 29.0 29.4 29.5 33.4 33.0 32.8 32.6 31.6 31.4 30.4 30.8 30.2 29.9 28.0 28.0 30.8
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I Februarv 3. 2003 34.9 40.0 40.5 39.1 48.6 41.0 41.6 35.9 37.5 36,7 39,2 31.5 36.0 41.4 40.1 392
I May 3. 2003 37.3 37.5 38.7 36.9 37.5 39.6 38.2 34.5 33.8 33.2 33.8 34.5 33.7 43.7 44.9 372
I July 2. 2003 36.9 36.6 36.6 37.7 37.4 37.6 37.9 34.3 34.5 33.9 37.1 33.6 42,3 42.4 37,1
I Auaust 3. 2003 37.0 37.5 35.7 36.7 37.0 36.3 36.0 33.4 33.8 33.1 33.1 33.5 33.2 40.6 40.8 35.8
I Seoiember 3. 2003 38.5 38.3 39.3 38.9 38.9 39.7 37.1 36.7 35.9 36.5 35.8 35.0 42.7 43.5 38.3
I October. 2003
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I Januarv 18. 2004 46.1 442 41.7 43.0 43.5 42.8 40.9 39,9 39.4 39.8 382 52.1 532 432
I March 22. 2004 47.4 39.0 40.8 27.3 26.1 25.1 26,3 282 35.7 412 37.0 32.7
I July 5. 2004 42.7 42.1 39.1 41.4 41.2 40.9 41.1 37.9 38.3 37.6 37.1 36.3 36.7 79.9 79.9 45.0
IAuaustl. 2004 41.5 41.7 42.4 43.1 42.7 40.2 40.2 36.9 37,0 37.2 36.5 36.4 36.3 64.7 64.3 42.8
I Auaust 19. 2004 43.7 43.8 42.1 41.6 42.8 42.3 38.4 382 38.1 37.8 37.9 38.1 65.0 65.5 44.0
I Seotember 30. 2004 42,6 43,6 42.0 42.9 40.9 41.2 38.6 39.0 38.4 37,8 38.2 37.8 51.5 51.6 41.9
January 11. 2005 45.4 46.1 43.1 44.6 43.3 41.9 38.7 39.5 52.7 53.5 44.9
March 31. 2005 33.3 57.9 35.6 34.6 24.6 21.3 25,8 42.6 42.3 38.9 35.7
May 2. 2005 41.0 40.5 39.7 39.8 40.4 40.4 35.5 36.8 36.0 36,3 35.8 35.8 49.4 49.6 39.8
June 7. 2005 41.4 41.6 42.1 42.2 42.6 41.7 36.9 37.4 36.4 372 37,1 36.0 56.0 55.8 41.8
July 7. 2005 47.7 45.6 42.0 43.1 49.3 50.7 50.1 38.5 42.8 41.8 45.8 40.9 44.3 75.2 85.1 49.7
Julv 28. 2005 44.6 46.5 45.3 44.6 44.4 43.5 43.9 38.7 38.9 39.0 37.7 392 38.8 682 72.8 45.8
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PRIOR LAKE CYANIDE MONITORING RESULTS
SAMPLE LOCATION
ON CYANIDE IN mglL
May 3, 2003 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02
June 2, 2003 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02
August3,2003 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02
No Samples Taken
October 6, 2003 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02
March 4, 2004 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02
July 4, 2004 <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02>
August 1, 2004 <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02>
August 19,2004 <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02>
September 30, 2004 <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02>
January 11, 2005 <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02>
March 31, 2005 <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02>
May 2, 2005 <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02>
May 31, 2005 <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02>
July 5, 2005 <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02>
July 29, 2005 <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02> <0.02>
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DATE: October 18th, 2005
TO: Frank Boyles, City Manager,
Lake Advisory Committee
FROM: Larry Poppler, Assistant City Engineer
cc: Steve Albrecht - Public Works Director/City Engineer
RE: Beach Testing Results and Policy
The level at which a beach is normally closed due to E-Coli is 200 colony forming units /
100 ml. As you can see by the attached summary sheet, the levels sampled in Prior Lake
are extremely low.
As part of the 2005 budget, the City has set aside funds for testing the beaches for E-Coli
levels during the summer months. The following is the established testing program :
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Time Frame:
Location:
Frequency:
Beach Closure:
Testing Method:
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Test Results:
Second week in June (Beach Opening) through the third week in
August (Beach Closing)
Sand Point Beach and Watzl's Beach
Once every two weeks. IfE-Coli results are over 100 CFU/I00 ml,
the City will take additional tests daily until levels are shown to be
below 100 CFU/1 00 ml.
IfE-Coli levels are over 200 CFU/lOO ml, the beaches present a
hazard to users and will be closed until test results show levels
below 200 CFU/I00 ml. The Engineering Division will contact
Parks and Recreation to coordinate beach closure.
Samples will be taken by the Engineering Division at the
approximate center of the swimming area. The sample will be
taken at a depth of 2.5 feet. The closed sample bottle will be
submerged to a depth of6" below the surface of the water. The
bottle will be opened under water, collecting the sample. The
sample will be taken to the Engineering Division for laboratory
pickup. The samples must be tested within 24 hours ofthe
sampling.
Test results will be available within one week. If the test results
show that the E-Coli levels are becoming elevated, the Engineering
G:\Water_Bodies\1ake water quality\E-Coli Testing\Beach Test Results 101805.doc
Reporting
Division will request that the laboratory provide test results as soon
as they are available.
The test results will be tracked and monitored by the Engineering
Division. A summary sheet will be distributed at the conclusion of
each summer.
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G:\Water_Bodies\lake water quality\E-Coli Testing\Beach Test Results l01805.doc
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PRIOR LAKE E. COLI MONITORING RESULTS
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SAMPLE LOCATION
ON E. COlliN COLONY
FORMING UNITS/100 mL
2002
Jul24 4.0 2.0
2003
Jul2 2.0 3.0
Jul22 13.0 18.0
Aug 8 1.0 3.0
2004
Jun 14 10.0 22.0
Jun 29 1.0 60.0
Jul 13 22.0 4.0
Jul27 4.0 6.0
Aug 11 4.0 2.0
r 2005
Jul8 4.0 2.0
Jul22 19.0 37.0
Aug5 18.0 7.0
Aug 22 10.0 11.0
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E. COLI TESIlI~G POLICY
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Testing the public beaches on Prior Lake for E. Coli should happen weekly. There
should be a single sample taken from the center ofthe swimming area. The sample
should be taken approximately six inches below the surface at a depth of two and a half
feet. If samples show elevated E. Coli levels, more frequent sampling may be needed.
The lab used by the city to test the samples should provide a sampling kit or present
information on what supplies are needed.
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550 South Snelling Ave
St. Paul, MN 55116
651.690.9602
(fax) 690.9602
mccomas@pclink.com
MEMO
Date: October 18, 2005
To: Shannon Lotthammer, Administrator, Prior Lake/Spring Lake Watershed District
From: Steve McComas, Blue Water Science
Topic: Aquatic Plant Overview for Lower and Upper Prior, Spring, and Fish Lakes for
2005
Lower Prior
Early Summer: Curlyleaf is widely distributed, but low in density, Eurasian watermilfoil is
present but is sparse. Native plants are common and there is a good diversity.
r-
Late Summer: Curlyleaf has died back where as milfoil stayed about the same. There were no
matted milfoil areas in 2005. lllinois pondweed, a native plant, is surfacing in several areas
around the lake.
Upper Prior
Early Summer: Curlyleaf and Eurasian watermilfoil are widely distributed and growing to the
surface in water depths out to 5 feet. Eurasian water milfoil got a quick start this summer and
was abundant in nearshore areas. The same milfoil growth characteristics were found in a
number of other area lakes this summer. Native species were rare.
Late Summer: Curlyleaf has died back and surprisingly, milfoil died back to a degree as well.
Where present, milfoil grows in bunches, meaning 10-12 stems grow out from a single root
crown, but they do not form a solid surface canopy. This condition is referred to as light growth,
which is not as bad as heavy growth, which is defined as a solid surface canopy. Native plants
were rare in Upper Prior.
Spring Lake
Early Summer - Pre-herbicide Application: Curlyleaf is present, but stem densities were less in
2005 compared to previous years (based on SCUBA diving data).
,--
Early Summer - Post Herbicide Application: Curlyleafwas still found on June I (about a month
after the herbicide application) but it was sparse. There was no matted curlyleaf observed.
Several additional native plant species were observed compared to the pre-herbicide survey.
Late Summer: Curlyleafhas died back and eight native plant species were observed. There is a
better plant diversity in Spring Lake than in Upper Prior.
Fish Lake
Early Summer - Pre-herbicide Application: Where curlyleaf is present it has very high stem
densities (based on SCUBA diving data). Native plant species are rare.
~.",.,
..
Early Summer - Post Herbicide Application: Curlyleaf occurrence has been reduced and no
matting curlyleaf was found. Curlyleaf stem densities are also dramatically reduced.
Late Summer: Curlyleaf has not resprouted. Several more native plant species were found, but
plant growth was only found out to water depths of 7 feet.
Table 1. Summary of the percent oC,currence of non-native plants.
Curlyleaf Eurasian Native
Pondweed Water mllfoU Species
Occurrence Occurrence Observed
Lower Prior Lake. 2005
June 12 67% 11% 12
August 28 3% 14% 12
Upper Prior Lake. 2005
June 12 90% 75% 1
August 28 6% 54% 2
Spring Lake. 2005 .
April 20 (pre-herb) 58% 0% 2
June 1 (post herb) 72% 0% 6
(small plants)
August 18 12% 0% 8
Fish Lake. 2005
April 10 49% 0% 2
June 5 8% 0% 2
August 31 0% 0% 7
Full aquatic plant survey reports are in the process of being compiled and prepared.
.
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2000 2001 2002 2003 2004 2005
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Lower Prior Lake Growing Season Average TP
Sustainable Lakes
Goal: s 30 ppb
5
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2000
2001
2002
2003
Year
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Upper Prior lake Surface TP, 2004 Growing Season
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Sustainable Lakes
Goal: 70-90 ppb
20
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2001
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2004
2005
Year
r
Spring Lake 2005 Surface TP
200.0
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