1i. TH 101 Watermain Repair, Project No. 07-07: Approve Plans & 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
TO:
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Paul Oehme, City Engineer/Dir. of Public W orks ~ e ....
FROM:
Joseph Shamla, Project Engineer
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DATE:
January 31,2007
SUBJECT: T.H. 101 Watermain Improvements Project No. 07-07:
Approve Plans and Specifications; Authorize Ad for Bids
BACKGROUND
On January 22, 2007, Council authorized the preparation of the plans and specs
for the TH 101 watermain project.
DISCUSSION
The City is experiencing problems with a stretch of 12" trunk watermain along
TH 101 between Choctaw Circle and Fox Hollow Drive. Numerous breaks have
occurred in this section of pipe in the last few years. The breaks that have
occurred are chunks of pipe that are breaking away. These types of breaks are
attributed to the "hot" or corrosive soils in this area. Further inspection of the
pipe shows that the corrosion is occurring along the entire section which could
lead to additional breaks. Another concern with this section of pipe is the east
water treatment plant coming online. The east water treatment plant could
increase the water pressure in this area 10 psi leading to additional failures.
Based on preliminary soils investigations, it is estimated that approximately 1,100
LF of watermain is in the corrosive soils area and should be replaced.
Staff proposes to address the problem by replacing the existing watermain with a
12" high density polyethylene (HDPE) watermain. The existing pipe is proposed
to be abandoned in place. The new HDPE watermain is proposed to be
constructed under the walking trail and further away from TH 101. The
advantage of the HDPE is that it is flexible and will not deteriorate in corrosive
soils. The pipe will be directionally drilled which results in less restoration work
then the open cut method. The trail will need to be potholed where the new pipe
connects to the old pipe. The trail will be patched in the spring by the Street
department. HDPE is used extensively on watermain applications and has been
used successfully on several recent city projects. Staff will notify the property
owners in the area when the construction will start and the estimated duration of
the trail closure.
This project will need to be completed while the frost is still in the ground so that
it is not invasive to the trail and wetland areas. If the project is delayed to the
The City of Chanhassen . A growing community with clean lakes, quality schools, a charming downtown, thriving businesses, winding trails, and beautiful parks. A great place to live, work, and play.
Paul Oehme
January 31,2007
Page 2
point that the frost is no longer in the ground, the project will be delayed until December 2007.
Funding for this project has been budgeted in the 2007 CIP, Project W -033. The current project
estimate for the work is $120,000.
The anticipated schedule of the project is as follows:
Bid Opening
Award Contract
Start Construction
Substantial Completion
March 2, 2007
March 12,2007
March 13, 2007
May, 2007
RECOMMENDA TION
Staff recommends that City Council approve the plans and specifications and order the ad for
bids for City Project No. 07-07.
Attachment
c: Kelley Janes, Chanhassen Utility Superintendent
G:\ENG\PUBLIC\07-07 THIOl WM\EngDoc.doc
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Capital Improvement Program
City of Ch9-nhassen, MN
Project # W -033
ProJectName TH 101 Trunk Watermain Replacement
2007 thru 2011
Contact Unassigned
Department Water System Improvements
Type Irnprovement
Useful Life Unassigned
Category Utilities
Priority nla
Account # 1 700-0000-4751
Account #2
Account # 3
Total Project Cost $200,000
Description
. A segment of 12" watermain along TH 101 from Brule Circle to Gray Fox Curve has had several watermain breaks over the past years. Inspection
of the watermain indicates this watermain has deteriorated significantly due to the hot soils in the area, is in very poor condition and should be
replaced.
Justification
To reduce emergency calls and disruption of water service to residents.
Expenditures
COnstruction
2007
200,000
200,000
2008
2009
2010
2011
Total
200,000
200,000
Total
Funding Sources
Water Utility Fund
2007
200,000
200,000
2008
2009
2010
2011
Total
200,000
200,000
Total
Operational Impact/Other
121
January, 2007
G:\ENG\Public\07-07\Maps\Extent of Project.mxd