1d TH 101 North Watermain Proj. 07-07: Authorize Preparation of Plans & Specs
CITY OF
CHANHASSEN
7700 Market Boulevard
PO Box 147
Chanhassen, MN 55317
Administration
Phone 952.2271100
Fax: 952.227.1110
Building Inspections
Phone 952.227.1180
Fax: 952.2271190
Engineering
Phone: 952.227.1160
Fax: 952.2271170
Finance
Phone 952.227.1140
Fax 952.2271110
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Phone: 952.2271120
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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: 952.2271300
Fax: 952.2271310
Senior Center
Phone 952.227.1125
Fax: 952.227.1110
Web Site
www.ci.chanhassen.mn.us
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MEMORANDUM
TO:
Paul Oehme, City Engineer/Dir. Of Public Works
Joseph Shamla, Project Enginee~ ~ .
January 22, 2007
FROM:
DATE:
SUBJ:
TH 101 Watermain Improvements Project No. 07-07: Authorize
Preparation of Plans & Specifications
REQUESTED ACTION
Authorize preparation of plans and specifications for the TH 101 watermain.
BACKGROUND
The City is having 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. In inspecting the pipe after breaks, the pipe is
showing additional areas of corrosion that could lead to additional breaks. The
watermain is close to the TH 101 roadway, therefore, the southbound lane of TH
101 is closed to get equipment mobilized and to do the work when watermain
breaks occur. If a major break were to occur, it is possible that TH 101 could be
washed out. The east water treatment plant coming online in the spring is
estimated to increase the water pressure in this area about 10 psi. This amount of
increased pressure could cause other failures of this pipe.
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 farther away from TH 101. The
advantage of using HDPE pipe is that it is flexible and will not deteriorate in
corrosive soils. Also, the pipe can be directionally drilled which results in less
restoration work then open cutting the pipe and will allow the work to be
completed sooner. The trail will need to be potholed where the new pipe connects
to the old pipe. The trail patches will be temporarily patched after the work is
complete and permanently patched in the spring by the Street department. HDPE
pipe is used extensively on watermain applications and has been used successfully
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 22, 2007
Page 2
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.
The Engineering department is proposing to prepare the plans and specifications
and bid the project out. Also, staff will be responsible for the construction
administration of the contract. Surveying and soils investigation work will be
completed by others.
The project is proposed to be bid in February and have construction start in late
February or early March. 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 point that the frost is no longer present in the ground, the
project may have to 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.
RECOMMENDA TION
Staff is recommending Council authorize preparation of plans and specifications
for the TH 101 watermain improvements.
Attachments
c: Kelley Janes, Chanhassen Utility Superintendent
G:IENGIPUBLICI07.07 Hwy. 101 Dir. BorelAuthorize P&S 012207.doc
Capital Improvement Program
City of Chanhassen, MN
2007 thru 2011
Contact Unassigned
Department Water System Improvements
Type Improvement
Useful Life Unassigned
Category Utilities
Priority nla
Project #
W-033
Project Name TH 101 Trunk Watermain Replacement
Account # 1 700-0000-4751
Account # 3
Account #2
Total Project Cost $200,000
Description
. A segment of 12" watermain along 1H 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
2010
Total
200,000
200,000
2011
2009
Total
Funding Sources
Water Utility Fund
2007
200,000
Total 200,000
2008
2009
2011
Total
200,000
200,000
2010
I~~~
121
Project
Area
January, 2007
G:\ENG\Public\07 -07\Maps\Extent of project.mxd
Hwy 101 Watermain Improvement Project Area
City Project #07-07
January, 2007
G:\ENG\Public\07-07\Maps\Extent of Project.mxd