HomeMy WebLinkAbout10B - Storm Sewer Repair
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4646 Dakota Street SE
Prior Lake. MN 55372
CITY COUNCIL AGENDA REPORT
August 16, 2010
10B
Steve Albrecht, Director of Public Works
Steve Albrecht
Consider Approval of a Resolution Authorizing the Emergency Repair
of the Carriage Hills Storm Sewer System Outlet
Introduction
The purpose of this agenda item is to seek City Council approval to make
emergency repairs to the Carriage Hills storm sewer outlet.
Historv
In the mid 1990's an outlet pipe for the Carriage Hills Development was
installed on the Vierling Property to manage stormwater runoff. Last
week's heavy rain resulted in erosion issues and eventual failure of that
portion of the system.
Current Circumstances
On Friday, August 13, City staff inspected numerous storm water facilities
after an estimated 3.8-inch rainfall event the previous night. The Carriage
Hills outlet end section and two sections of storm sewer failed and slid
down the embankment during the storm event. Additionally, it appears that
a section of storm sewer 25 to 30 feet up stream also was damaged
causing a sink hole. The attached pictures show the failed section and
damage.
In its current condition there is severe erosion to the existing wetland to the
north. Additionally, without repair it is anticipated more damage will occur.
The estimated cost of the repair is $20,000 to $30,000 depending on the
extent of subsurface damage which is currently unknown.
Conclusion
Staff recommends the City Council authorize staff to make immediate
repairs to the storm sewer before additional infrastructure and
environmental damage occur.
Failure to repair the damage will result in additional impacts to the City's
storm sewer, private property and the wetland area to the north.
The required funding for the repairs is available in the Water Quality Fund
which is utilized for storm water system outlet repairs.
Staff recommends that the 2010 Water Quality Fund budget be amended to
reflect the additional expenses utilizing fund balance reserves as the
funding source.
R:\Council\2010 Agenda Reports\08 16 1O\Carriage Hills Storm Sewer.doc
ALTERNATIVES: The alternatives are as follows:
1. Approve a resolution authorizing the repair of the Carriage Hills
storm sewer outlet.
2. Table this agenda item for a specific reason.
3. Deny this agenda item for a specific reason and provide staff with
direction.
RECOMMENDED Alternative #1.
MOTION:
Reviewed by:
Frank Boyles, City Manager
R:\Council\2010 Agenda Reportsl08 16 1O\Carriage Hills Storm Sewer.doc
2
4646 Dakota Street SE
Prior Lake. MN 55372
RESOLUTION 1 a-xxx
A RESOLUTION AUTHORIZING REPAIR OF THE CARRIAGE HILLS STORM SEWER OUTLET
Motion By:
Second By:
WHEREAS,
The City owns and maintains a storm sewer system which includes the Carriage Hills
storm sewer outlet to the Vierling Property; and
WHEREAS,
On August 13, 2010 after heavy rains, the outlet failed and slid down a slope causing
severe erosion to the wetland located to the north; and
WHEREAS,
In order to mitigate the existing damage, and prevent additional damage to City
infrastructure, private property and wetlands the City should repair the damage
immediately; and
WHEREAS,
The estimated repair cost is $20,000 to $30,000.
NOW THEREFORE, BE IT HEREBY RESOLVED BY THE CITY COUNCIL OF PRIOR LAKE,
MINNESOTA as follows:
1. The recitals set forth above are incorporated herein.
2. The City Manager is authorized to approve expenditures for repairs not to exceed $30,000 for the storm
sewer outlet.
3. Funds will be drawn from the Water Quality Fund Account # 602-49420-412.
4. The 2010 Water Quality Fund Budget will be amended to reflect the additional expense utilizing fund
balance reserves as the funding source.
PASSED AND ADOPTED THIS 16th DAY OF AUGUST, 2010.
Myser Myser
Erickson Erickson
Hedbera Hedbera
Keeney Keeney
Millar Millar
YES
NO
Frank Boyles; City Manager
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