1c. 2009 San Sewer Rehab: Approve Plans and Specs
CITY OF
CHANHASSEN
7700 Market Boulevard
PO Box 147
Chanhassen, MN 55317
Administration
Phone: 952.227.1100
Fax: 952.227.1110
Building Inspections
Phone: 952.227.1180
Fax: 952.227.1190
Engineering
Phone: 952.227.1160
Fax: 952.227.1170
Finance
Phone: 952.227.1140
Fax: 952.227.1110
Park & Recreation
Phone: 952.227.1120
Fax: 952.227.1110
Recreation Center
2310 Coulter Boulevard
Phone: 952.227.1400
Fax: 952.227.1404
Planning &
Natural Resources
Phone: 952.227.1130
Fax: 952.227.1110
Public Works
1591 Park Road
Phone: 952.227.1300
Fax: 952.227.1310
Senior Center
Phone: 952.227.1125
Fax: 952.227.1110
Web Site
www.ci.chanhassen.mn.us
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MEMORANDUM
o
Paul Oehme, Director of Public Works/City Engineer <:;]"
Joseph Sham!., Project Engin~~
April 13, 2009 6~'
TO:
FROM:
DATE:
SUBJ:
2009 Sanitary Sewer Rehabilitation (III) Project No. 09-03: Approve
Plans & Specifications; Authorize Ad for Bids
PROPOSED MOTION
"The City Council approves the plans and specifications and authorizes the ad for bids
for the 2009 Sanitary Sewer Rehabilitation (III) Project No. 09-03."
City Council approval requires a simple majority vote of the City Council present.
BACKGROUND
The City received notice back in 2006 from the Metropolitan Council that we exceeded our
allowable inflow of sanitary sewer in 2005. The reason for exceeding the allowable amount
was due to Infiltration and Inflow (III) of clear water entering the sanitary sewer system. A
surcharge will be added to our sanitary sewer bill unless we take corrective action to mitigate
the III.
DISCUSSION
The 2009 Sanitary Sewer Rehabilitation Project is proposed to address both Infiltration and
Inflow (III) and structural issues. In 2008, televising was completed between Lift Station #24
and the new high school. This section of concrete sanitary pipe has been damaged due to the
hydrogen sulfide released as the sewer flows through the pipe. The damage has caused the
rubber gasket seals at most joints to become loose which has allowed ground water to drain
into the pipe. In order to prevent infiltration of this pipe, staff is proposing to line the pipe
with a structural liner. This type of liner was installed last year in the 2008 project and is
working well. Other improvements to the area will include pipe joint sealing, replacing
castings, and grouting manholes and pipe joints. Another option staff considered was
installing a new pipe instead of lining the existing pipe, but this option was not feasible due to
the environmental impacts to the adjacent wetland and cost.
Staff feels this area contributes some of the highest levels of III to the system. Attached is a
map showing the repair areas proposed for 2009.
Funding for this project has been budgeted for in the 2009 CIP, Project SS-012, and will be
paid for by the Sewer Utility fund. The current project cost estimate for the work is
$190,000.
The anticipated schedule of the project is as follows:
Bid Opening
A ward Contract
Substantial Completion
April, 30, 2009
May 11,2009
July 8, 2009
Attachments
g:\eng\public'-2009 projects\09-03 i & i repairs\bkgd 041309 approve plans. doc
Chanhassen is a Community for Life - Providing for Today and Planning for Tomorrow
Capital Improvement Program
City of Chanhassen, MN
88-012
2009 thru 2013
Contact Paul Oehme
Department Sanitary Sewer Improvements
Account # 1 701-7024-4751
Account # 3
Type Improvement
Useful Life Unassigned
Category Utilities
Priority nla
Project #
Project Name Inflow and Infiltration Abatement
Account #2
Total Project Cost $750,000
Description
This annual project includes televising, repairs and rehabilitation of existing sanitary sewer. The program also detects and eliminates points of
entry of ground water and surface water into the City sanitary sewer system. Projects have been identified from the 2006 Inflow and Infiltration
Report. The projects were reviewed by Metropolitan Council and approved in lieu of surcharge fees.
Justification
City staff has identified numerous older sewer lines that are in need of repair. The City of Chanhassen pays the Metropolitan Council for sewage
treatment. Those payments are based on the amount of flow generated by the City of Chanhassen. Surface water and ground water that makes its
way into the system either through breaks, displaced joints, manhole covers, or private connections to the system increase the amount charged to
the City for sewage disposal and increasing the load on the City's lift stations. Also, MCES would place a surcharge the annual charge if the City
was not actively trying to reduce the inflow and infiltration problem.
Expenditures
Maintenance
2009
200,000
200,000
2010
200,000
200,000
2011
200,000
200,000
2012
75,000
75,000
2013
75,000
75,000
Total
750,000
750,000
Total
Funding Sources
Sewer Utility Fund
2009
200,000
200,000
2010
200,000
200,000
2011
200,000
200,000
2012
75,000
75,000
2013
75,000
75,000
Total
750,000
750,000
Total
'Operational Impact/Other
Jhe efforts may decrease operational costs, MCES fees and emergency call outs. It is also the city's intent to use connection charges to help fund
for those costs. It is the city's belief that as new customers come on line those connection fees should help fund future infiltration problems.
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