1e. West-Central Lotus Lake Improvement Project No. 08-02 Approve Plans & Specifications; Authorize Advertisement for Bids
CITY OF
CHANHASSEN
7700 Market Boulevard
PO Box 147
Chanhassen, MN 55317
Administration
Phone: 952.227.1100
Fax: 952.227.1110
BUilding,lnspections
Phone: 952.227.1180
Fax: 952.227.1190
Engineering
Phone: 952.227.1160
Fax: 952.227.1170
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Phone: 952.227.1140
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Phone: 952.227.1120
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Recreation Center
2310 Coulter Boulevard
Phone: 952.227.1400
Fax: 952.227.1404
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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
w#w.ci .chanhassen .mn.us
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MEMORANDUM
TO:
-J?"CJ.
Paul Oehme, Director of Public Works/City Engineer ~ '
Terrance Jeffery, Water Resources coordina~
December 8, 2008 W'
West-Central Lotus Lake Improvement Project No. 08-02
Approve Plans & Specifications; Authorize Advertisement for Bids
FROM:
DATE:
SUBJECT:
PROPOSED MOTION
"The City Council approves the plans and specifications and authorizes
advertisement for bids in the Construction Bulletin and Chanhassen Villager
for Phase I of work for the West-Central Lotus Lake Improvement Project No.
08-02."
City Council approval requires a simple majority vote of the City Council
present.
BACKGROUND
In September of 2005, an extreme rain event resulted in substantial damage and
threat to private residences as well as existing City infrastructure within and
tributary too Meadow Green Park Pond.
On February 25, 2008, City Council authorized WSB & Associates to perform a
feasibility study for the West-Central Lotus Lake watershed.
On October 20, 2008, WSB & Associates provided the final feasibility report to
the City for review and comment.
On November 10, 2008, Council heard a presentation summarizing the findings
and conclusions of the feasibility report.
On December 1, 2008, Staff held a neighborhood meeting to discuss the findings
of the study and the proposed Phase 1 plans.
DISCUSSION
Staff is requesting the Council to approve the plans and specifications and
authorize advertisement for bids from qualified contractors. These plans only
address Phase 1 of the West-Central Lotus Lake Improvement Project.
The feasibility report identified 18 possible components of an overall solution to
address the stormwater drainage issues within the West-Central Lotus Lake
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Paul Oehme
West-Central Lotus Lake Improvement Project
December 8, 2008
Page 2
Watershed. Staff worked with the consultant to evaluate the most efficient way to implement
these components and it was determined to look at the overall project as a series of three phases.
Phase 1 would occur in the winter of2009 with the project being substantially completed by the
end of March 2009. Final stabilization would occur after all plantings had been finished in early
July. This Phase I will include the items shown on the following table.
2009 IMPROVEMENT PROJECT
A-4 DEBRIS CATCHER STRUCTURE UPSTREAM OF $29,000
KERBER BOULEVARD
A-6 LOWER EXISTING BERM EAST OF KERBER $17,500
A-7 CONSTRUCT CHECK DAMS (3) EAST OF KERBER $97,000
B-1 RECONSTRUCT POND OUTLET TO NORTH $44,000
RAISE AND STABILIZE EXISTING MEADOW GREEN
B-2 PARK WETLAND BERM; RECONSTRUCT $46,500
EMERGENCY OVERFLOW
B-3 REMOVE EXISTING WETLAND OUTLET $11,000
B-4 RECONSTRUCT OUTLET CONTROL STRUCTURE $129,000
B-5 EXTEND STORM SEWER OUTFALL TO LOW POINT $23,500
TOTAL ESTIMATED COST $397,500
Phase 1 would address the hydrologic and hydraulic issues between Kerber Boulevard
downstream to the outlet of the Meadow Green Park wetland. The work will involve the
installation of a debris catcher upstream of Kerber Boulevard, improvements to the existing berm
east of Kerber Boulevard, the installation of ditch checks within the channel north of Bighorn
Drive, stabilization of the berm which was breached in September of2005, and improvements to
the outlet structures within the wetland.
Phase 2, which is not within the scope of this project, will look for additional storage, water
quality treatment and rate control upstream of the system. Phase 3 will involve stabilization for
the outlet channel to Lotus Lake. Given the imminent Total Maximum Daily Load study for
Lotus Lake, staff feels it is best to delay Phase 2 until the TMDL is completed. This will assure
that any work performed will meet the requirements of the TMDL. Staffhas further concluded
that any stabilization of the outlet channel should be forestalled until upstream issues have been
addressed.
g:\eng\public\_2008 projects\08-02 west-central lotus lake improvements\12-08-08_memocc_authorize plans.doc
Paul Oehme
West-Central Lotus Lake Improvement Project
December 8, 2008
Page 3
SCHEDULE
If Council authorizes advertisement for bids, the work schedule for Phase I will be as follows:
December 16, 2008
December 22 & 29, 2008
December 24 & 31, 2008
Janu 12,2009
Janu 26,2009
Janu 27,2009
Week ofFebruar 2,2009
A rill, 2009
July 1, 2009
Submit advertisements to Construction Bulletin and Chanhassen
Villa er
Advertise in the Construction Bulletin
Advertise in Chanhassen Villa er
Bid 0 enin
Award Contract at Ci Council Meetin
Preconstruction meetin
Be in Construction
Substantial Com letion
Final Stabilization
FUNDING
The project will be funded with the Surface Water Management Plan (SWMP) funds. The City
will continue to solicit partnerships with other agencies for Phase 1 but has budget sufficient
financial resources in the CIP fund in case these partnerships are not realized.
It is anticipated that future phases may be paid for, at least in part, through Clean Water Legacy
grant funds. Staff will also work to try to indentify additional funding sources for the future
phases.
Attachments: Location Maps
CIP Page (2009)
c: Todd Hubmer, WSB & Associates, Inc.
Paul Hudala, WSB & Associates, Inc.
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Capital Improvement Program
City of Chanhassen, MN
2009 thru 2013
Contact Paul Oehme
Department Surface Water Management
Account # 1 720-0000-4300
Account # 3
Type Improvement
Useful Life
Category SWMP
Priority nfa
Project #
SWMP-031
Project Name West Lotus Lake Drainage Improvements
Account #2
Total Project Cost $875,000
Description I
This improvement project addressess storm water quality and quantity issues in the Lotus Lake watershed. In 2005, the regional pond over topped
causing significant damage down stream. The storm water ponding in this area was discussed with the City Council during the review of the Lotus
Woods development. The Watershed District has made Lotus Lake a high priority in their capital improvement plan. The city requested funds
from RPBCWD in 2008 and the request was denied as the Watershed had different priorities. The City will again request funds from the
Watershed District but wishes to be prepared in the event that the Watershed's priorities are still not aligned with the City's.
Justification I
To improve water quality and quantity in the Lotus Lake watershed.
Expenditures
Construction
2009
475,000
475,000
2010
2011
400,000
400,000
2012
2013
Total
875,000
875,000
Total
Funding Sources
Surface Water Utility Fund
Total
2009
475,000
475,000
2010
2011
400,000
400,000
2012
2013
Total
875,000
875,000
Operational Impact/Other I