HomeMy WebLinkAbout5F Inflow and Infiltration Report
Phone 952.447.9800 / Fax 952.447.4245 / www.cityofpriorlake.com
4646 Dakota Street SE
Prior Lake, MN 55372
CITY COUNCIL AGENDA REPORT
MEETING DATE: SEPTEMBER 26, 2016
AGENDA #: 5F
PREPARED BY: LARRY POPPLER, CITY ENGINEER/INSPECTION DIRECTOR
PRESENTED BY: LARRY POPPLER
AGENDA ITEM: CONSIDER APPROVAL OF A RESOLUTION AUTHORIZING THE
CITY’S PARTICIPATION IN AN MCES GRANT PROGRAM FOR THE
MITIGATION OF INFLOW/INFILTRATION (I/I) IN THE PUBLIC
SANITARY SEWER SYSTEM
DISCUSSION: Introduction
In order to receive grant funding from the MCES for inflow and infiltration, a
City Council resolution approving the City’s participation is necessary.
History
Sanitary sewer systems when they were originally constructed were built
watertight. However, over time the sanitary pipe and manholes can begin
to receive groundwater through joints in the pipes and manholes. Over
time, these joints are affected by soil movement, pipe degradation, or root
intrusion and can begin to receive clear groundwater. The groundwater
adds flow to the sanitary sewer system and eventually is sent to the
downstream to the Blue Lake Wastewater Treatment Facility in Shakopee.
Each year it is estimated that the City of Prior Lake piping contributes on
average 40 million gallons of clean groundwater to Blue Lake. City
projects attempt to focus efforts to reduce inflow and infiltration.
Current Circumstances
The Metropolitan Council Environmental Services (MCES) established an
Inflow and Infiltration Reduction Program in 2005. The program, which
was developed with the input of city public works directors, engineers and
finance staff, aims to reduce the amount of clear groundwater entering the
wastewater collection system.
Various City projects replace aging sanitary sewer pipe and are eligible for
grant proceeds in accordance with the MCES I/I Program. The City
projects submitted for this program include the Credit River Road Project,
Highland/Marsh/Skyline Project, and Grainwood/Eau Claire Project. Each
of these projects included sanitary sewer replacement and were completed
in 2015. In order to be reimbursed through this program, the City must
approve a resolution by October 30, 2016.
2
Conclusion
Staff recommends that the City participate in the MCES grant program for
mitigation of inflow and infiltration.
ISSUES: It is imperative that the City continue to make strides to reduce inflow and
infiltration into the sanitary sewer collection system not only because it
reduces wastewater treatment costs, but because part of being a good
environmental stewart.
FINANCIAL
IMPACT:
Each City submitting for grant proceeds are eligible to receive the lesser of
$25,000 or 50% of the submitted eligible project costs. For the City of Prior
Lake, the eligible amount for grant funding amounts to $87,750 so it is
expected that the City would receive a full allocation of $25,000.
ALTERNATIVES: 1. As part of the consent agenda approve a Resolution Authorizing the
City’s Participation in an MCES Grant Program for Mitigation of
Inflow/Infiltration in the Public Sanitary Sewer System.
2. Remove this item from the consent agenda for additional
discussion.
RECOMMENDED
MOTION:
A motion and second for approval of alternative number 1.
4646 Dakota Street SE
Prior Lake, MN 55372
RESOLUTION 16-XXX
RESOLUTION AUTHORIZING THE CITY OF PRIOR LAKE‘S PARTICIPATION IN AN MCES
GRANT PROGRAM FOR THE MITIGATION OF I/I (INFLOW/INFILTRATION) IN THE PUBLIC
SANITARY SEWER SYSTEM
Motion By: Second By:
WHEREAS, The Metropolitan Council Environmental Services (MCES) has offered a grant to
the City for the mitigation of I/I in the public sanitary sewer system; and,
WHEREAS, The City has been identified by the MCES as having exceeded their I/I allowance;
and,
WHEREAS, The City has received a Letter of Intent from MCES for an anticipated grant amount
of $25,000.00; and,
WHEREAS, MCES requires that the City Council adopt a resolution authorizing the City to apply
for grant funds, and execution of grant agreement.
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 Mayor and City Council identifies the City Engineer as the City Officer authorized to
execute the grant application and grant agreement on behalf of the City of Prior Lake &
submit it to the Metropolitan Council.
PASSED AND ADOPTED THIS 26th DAY OF SEPTEMBER 2016.
VOTE Hedberg Keeney McGuire Morton Thompson
Aye ☐ ☐ ☐ ☐ ☐
Nay ☐ ☐ ☐ ☐ ☐
Abstain ☐ ☐ ☐ ☐ ☐
Absent ☐ ☐ ☐ ☐ ☐
______________________________
Frank Boyles, City Manager