1 SWMP Update Lake Riley/Rice Marsh Lake
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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WATER RESOURCES UPDATE
November 2005
TO:
Todd Gerhardt, City Manager
Lori Haak, Water Resources Coordinator ~
FROM:
DA TE: November 30, 2005
SURFACE WATER MANAGEMENT PLAN UPDATE
Yosemite Neighborhood
The preliminary storm water assessment for the YosemitelWest 63rd Street
neighborhood is complete. The results of the assessment were passed along to
Bolton and Menk, who will be the consultant for the remainder of the project.
Public Input and Involvement
Four of six SWMP update task force meetings have been held. One or two
more meetings (seven or eight total) may be necessary to achieve all the goals
set for the task force. Staff will run any additional meetings to stay on budget.
The technical committee, composed of federal, state and local government
personnel, will be having their first meeting on December 1, 2005.
Overall Progress and Funding
Staff met with Ron Leaf from SEH on November 16 regarding the Surface
Water Management Plan Update storm water infrastructure inventory. The
purpose of the meeting was to discuss the status of the project and about the
areas where the numbers have exceeded estimates and therefore the costs
exceeded contract amounts.
The original estimate, included in the City's Request for Proposals, for
numbers of wetlands inventoried was 400. At present, SEH has inventoried
420 wetlands, 20 more than anticipated. The cost per wetland from SEH's
original proposal was approximately $105. Using that figure would result in
an additional $2,100 for that task.
The original estimate, included in the City's Request for Proposals, for
numbers of storm water structures inventoried was 4,500. Since the City's
1994 SWMP did not include a structure inventory, an estimate was developed
using miles of street or city size (in square miles) and the number of structures
in cities with inventories (Burnsville and Eden Prairie).
As of November 16, SEH had inventoried approximately 5,650 structures.
They anticipate the total number being in the 6,100 to 6,500 range. This is
The City of Chanhassen · A growing community with clean lakes, quality schools, a charming downtown, thriving businesses, winding trails, and beautitul parks A great place to live, work, and play
Water Resources Update
November 30,2005
1,600 to 2,000 more than originally estimated. The cost per structure from SEH's original
proposal was approximately $24 per structure. However, about 1/3 of the total structures
are located on private property, in parking lots or other places that were difficult to access
with survey equipment during standard business hours. SEH indicated that they plan to
request an additional 50% for those structures ($36 per structure). Using $36 per
structure for 2,000 structures would result in an additional $72,000 for that task.
(Currently, SEH estimates that their overall cost for the entire inventory has actually been
about $46 per structure.)
Because 2 anticipated 2005 projects (Curry Farms Creek Drainageway Project and
Frontier Trail Beachlot Ponding Project (LL-P7.5)) were not undertaken in 2005, the
Surface Water Management Plan fund line item for consulting (720-4300) is capable of
funding additional costs. To date, $128,096 of the budgeted $820,000 has been
expended. With the outstanding costs from the original contract added to this amount,
the total anticipated expenditures for the year (not including any changes to the SWMP
update contract) are approximately $400,000.
Again, all estimates are preliminary. Staff has requested a letter from SEH with the final
numbers and the justification of any and all overages so, if a contract amendment is
justified, such an amendment can be brought to the Council for their review and approval.
Staff anticipates receipt of such a letter no later than December 31.
Staff is working to discern whether the anticipated request is merited based on the
existing contract with SEH. More details regarding how the request compares to contract
language will be available once a formal request is made.
LAKE RILEY BASIC WATER MANAGEMENT PROJECT
In December 2002, Chanhassen and Eden Prairie petitioned the Riley-Purgatory-Bluff
Creek Watershed District (RPBCWD) to undertake the water quality improvements
outlined in the Use Attainability Analyses (UAAs) for Rice Marsh Lake and Lake Riley.
This involves the construction and expansion of several storm water ponds within the
lakes' subwatersheds in both Chanhassen and Eden Prairie. Several of the ponds that
were anticipated in the UAAs will be constructed with the TH 212 project. The
remaining ponds will be constructed or expanded as part of this RPBCWD project.
The RPBCWD will be funding 100% of the design, construction and project management
costs for the project (estimated at $2,000,000). The cities will be responsible for 75% of
all land acquisition costs. Currently, most of the improvements proposed in Chanhassen
are on public property. However, the RPBCWD has conducted appraisals for two
properties over which the City will obtain easements. The total estimated costs for the
easements are $160,000, leaving the City responsible for approximately $120,000. The
2005 CIP includes $100,000 for the Lake Riley/Rice Marsh Lake Improvements (Project.
#SWMP-020); the 2006 CIP includes $75,000.
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