1c. Harrison Hill Trail Drainage Imp Project: Award Contract
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
MEMORANDUM
TO:
ie-
i-
Todd Gerhardt, City Manager
FROM:
Terrance Jeffery, Water Resources Coordina~
DATE:
April 12, 2010
SUBJ:
o~.
Harrison Hill Trail Drainage Improvement Project
PW116C2: Award of Contract
PROPOSED MOTION
"The City Council approves a construction contract in the amount of
$29,976.01 to Minnesota Dirt Works for work to be performed on the Harrison
Hill Drainage Improvement project."
City Council approval requires a simple majority vote of the City Council
present.
BACKGROUND
The stormwater conveyance system in Longacres ih Addition has failed on at
least two separate occasions. In October of2005 and again in August of2009, the
storm sewer between 7136 and 7150 Harrison Hill Trial surcharged and the
resulting overland flow resulted in flooding of7150Harrison Hill Trail. A
number of factors contributed to the flooding. The house was constructed lower
than the design elevation. Landscaping and other land alteration occurred within
the emergency overflow between the two residences. The adjoining property
owner lowered the elevation of the berm to accommodate the placement of a
swing set. The storm sewer had insufficient capacity to handle flows during larger
rain events. All of these contributed to the basement flooding at 7159 Harrison
Hill Trail.
Staff modeled the rain event of August 2009 and determined that there was not
adequate capacity in the pipe between the two residences to convey the water.
Staff had WSB & Associates, Inc. (WSB) look at the model and the corroborated
staffs' conclusion. Staff worked with WSB to develop a plan to redirect a
significant portion of the stormwater to the wetland located south of the
stormwater pond. This area still discharges to the same larger wetland complex to
the south. This will alleviate the burden on the existing system without creating
any downstream issues.
Chanhassen is a Community for Life - Providing for Today and Planning for Tomorrow
Todd Gerhardt
Harrison Hills Trail Drainage Improvement Project
April 12, 2010
Page 2
Staff has had numerous discussions with the effected property owners along Harrison Hill Trail
as well as with the President and Vice President of the Longacres Homeowners Association.
QUOTES
Requests for quotes were submitted to three grading contractors on March 16, 2010. The bids
received are as follows:
Minnesota Dirt Works $29,973.29
Min er Construction $39,998.20
Parrott Contracting, Inc. $42,392.00
The engineer's opinion of total project cost was $40,008.00.
Minnesota Dirt Works performed the West-Central Lotus Lake Drainage Improvement Project in
the summer of2008. The quality of their work was acceptable. Staff is recommending that they
be awarded the contract for this project.
There is no firm start date as we are waiting for drier conditions before mobilizing equipment
into the area. Staff is anticipating a June 14, 2010 start. However, if antecedent moisture
conditions allow, an earlier start date could be used. Assuming a June 14,2010 start date, the
following schedule would be most likely:
April 12, 2010
May 6,2010
June 7, 2010
June 14,2010
July 9, 2010
A ward contract
Neighborhood meeting
Preconstruction meeting
Begin construction
Substantial completion
Staff is proposing to fund this project from the Fees for Services account of the Surface Water
Management Fund (SWMP) 720-0000-4300. There is currently $175,000 still remaining in this
fund.
Attachments: 1. Project Area Map
2. WSB, Figure 3, Improvement Option 1 - selected option
c: Dan Ames, Minnesota Dirt Works, Inc.
Todd Hubmer, WSB & Associates, Inc.
g:\eng\public\pwl16c2 -longacres-harrison hills trail\award construction_041210.doc
Legend
D Study Area
.
C1lYOY
lHllll1m
-t,
o
800
I Feet
1,600
City of Chanhassen
Harrison Hill Stormwater Improvements
Feasibility Report
Figure 1
Study Location Map
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WSB
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1,l1f,f
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w+,
s
o
50
.Feet
100
City of Chanhassen
Harrison Hill Stormwater Improvements
Feasibility Report
Figure 3
Improvement Option 1
.
WSB
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