1c. 2009 Sanitary Sewer Rehabilitation: Auth. 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
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TO: Paul Oehme, City Engineer/Director of Public W orks'\ '
FROM: Joseph Shaml., Project Engin~ ~.
DATE: March 23,2009
SUBJECT:
2009 Sanitary Sewer Rehabilitation (I & I) Project No. 09-03: Authorize
Preparation of Plans and Specifications
PROPOSED MOTION
"The City Council authorizes preparation of plans and specifications for the 2009
Sanitary Sewer Rehabilitation Project."
City Council approval requires a simple majority vote of the City Council present.
BACKGROUND
The Metropolitan Council has implemented a program to help decrease I & I into the sanitary
sewer system. A rainfall event in 2005 caused our sanitary system to exceed the allowed rate
of flow entering the system. In order to reduce flow from going above the allowed levels, the
Metropolitan Council has required the City to either repair the sanitary sewer system which
would decrease clear water (I & I) from entering the system or incur surcharge fees to help
pay for infrastructure expansion. The City has chosen to repair the sanitary sewer system
where warranted.
DISCUSSION
The 2009 project will fix some of the I & I problem areas that were identified in the 2008 I &
I project; these areas are known to contribute I & I to the system. Improvements will include
lining sewer pipes, pipe joint sealing, replacing castings? grouting manholes and pipe joints.
Repair areas proposed for the 2009 project will be near the new high school and adjacent to
Lyman Boulevard and Audubon Road. The sewer pipes in these areas are structurally in poor
condition and have I & I problems. The deterioration of these pipes and joints significantly
contribute to I & I due to the depth of the pipes and the level of the groundwater in the area.
Staffhad looked at replacement of the pipe in conjunction with the Lyman Boulevard
reconstruction but replacement was determined to be more expensive.
Staff is working with the City of Chaska to fix their sewer pipe that connects to the City of
Chanhassen's. This pipe was originally used by the City of Chaska for their industrial park
but for several years it has not been used since Chaska rerouted this flow to their new trunk
sewer line. However, if the property at the northwest corner of Audubon Road and Lyman
Boulevard would develop, the City of Chaska would like to use the existing sewer pipe that
connects to the Chanhassen sewer. Fixing the Chaska sewer pipe would be a 100% Chaska
cost. The City of Chaska will' contract for this work separately.
Funding for this project has been budgeted for in the 2009 CIP, Project SS-OI2, and will be
paid for by the Sewer Utility fund. The current project cost estimate for the work is
approximately $190,000.
G:\ENG\PUIUhlfiiha'S~ewi~w~tYlfb~if~em~~N1lP~ iI\l~~RllMlfJfiJr&ij_w
Paul Oehme
2009 Sanitary Sewer Rehabilitation
March 23,2009
Page 2
The anticipated schedule of the project is as follows:
Attachment:
Approve Plan & Spec.; Authorize Ad for Bids
Bid Opening
A ward Contract
Substantial Completion
April 13, 2009
April 30, 2009
May 11,2009
July 8, 2009
1. 2009 Sanitary Sewer Rehabilitation Project Location Map
2. CIP Page
g:\eng\public'-2009 projects\09-03 i & i repairs\auth plans specs 2009 i&i.doc
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(C.R. 18
MH REPAIR~ 37-007
New
High
School
MFrREPAtR
H REPAIR
40-004 40-005 40-006
Chaska Utility
Repair Area
. Spot Repair
181 Manholes
~Chanhassen
/\./ Chaska
E223 Lining Area
Sewer I & I Review 2009
Project 09-03
+
March 11, 2009
Capital Improvement Program
City of Chanhassen, MN
Project #
88-012
2009 thru 2013 Contact Paul Oehme
Department Sanitary Sewer hnprovements
Type Improvement
Useful Life Unassigned
Category Utilities
i
Priority nfa
Total Project Cost $750,000
Project Name Inflow and Infiltration Abatement
Account # 3
Account # 1 701-7024-4751
Account #2
",' ~-=";roj'" ;""100,, "'1_& repaim ",d _!rill,,"oo of """"'g ,..."'" 'OW". Th, prognun""o d_ oud ,_ pom~ 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 ofChanhassen 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.
erationallmpactlOther
fforts may decrease operational costs, MCES fees and emergency call outs. It is also the city's intent to use connection charges to help fund
ose costs. It is the city's belief that as new customers come on line those connection fees should help fund future infiltration problems.
I
Expenditures
Maintenance
2009
200,000
Total 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
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Funding Sources
Sewer Utility Fund
2009
200,000
Total 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
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