1i Lake Riley Woods: Approve Quote for Rain Gardens
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:
Paul Oehme, City Engineer/Dir. of Public W orkS-0- c?
FROM:
Krista Torgerson, Natural Resources Technician~-r
October 10, 2007 O~.
DATE:
SUBJECT:
Lake Riley Woods Raingardens, SWMP12-035A: Authorize
Expenditure of Funds for Installation of the Lake Riley Woods
Raingardens
BACKGROUND
On June 23, 2007, the Carver Soil & Water Conservation District Board of
Supervisors approved the State cost-share application for the City of Chanhassen,
as part of the Metro Environment Partnership grant, for the Foxford Road
Stormwater Retrofit Project. The amount approved for these raingarden project is
$12,000.
DISCUSSION
The City is experiencing problems with drainage in the Lake Riley Woods
development, which largely drains to the drainage channel on the Deal property.
In the past erosion that has occurred along this drainage channel is currently being
addressed with a rip stabilization project, SWMP12-035B. The Lake Riley
Woods raingardens would reduce the volume of stormwater that passes through
this channel, and therefore reduce the potential for future erosion of the channel.
The development is large lot with no City services. The streets are rural section
and storm water is not treated in ponds before discharging into wetlands and
eventually into Lake Riley. The Lake Riley Woods raingardens would also
provide some treatment for stormwater by reducing sediment and nutrient loading
in Lake Riley. Lake Riley is currently listed as impaired water for excess
nutrients.
Plans and specifications for the Lake Riley Woods raingardens have been
completed by the Association of Metropolitan Soil & Water Conservation
Districts. These plans include over-excavation of current clay and compacted
soils to a depth of 30". The soil would then be replaced with a 75% sand/25%
compost mixture in order to increase infiltration and volume storage. A
depression of 6"-9" would remain for holding capacity during rain events. A total
of nine raingardens are planned for construction. Every rain garden would include
an overflow that would outlet to the existing culvert. The raingardens would then
be covered with 6" of mulch and planted with shrubs. All raingardens are to be
constructed within the City's right-of-way and the City of Chanhassen will
continue to maintain any drainage within the City's right-of-way. Private utilities
will be avoided or moved. The homeowners have/will sign a maintenance
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
Lake Riley Woods Raingardens
October 22, 1007
Page 2
agreement with the City of Chanhassen before installation of the raingarden,
stating that they are responsible for maintenance of the plantings within the
raingarden. An example of the plans and specifications is attached to this
background.
Funding for this project has been budgeted III the 2007 Surface Water
Management Fund.
Three quotes have been obtained from the following contractors:
Kusske Construction Company, Inc.
Earth Wizards, Inc.
Sunram Construction, Inc.
$44,865.00
$33,756.00
$25,000.00
Staff has checked Sunram Construction, Inc. references and they have experience
with raingarden construction. Their past work and scheduling has been
acceptable.
The City's share of the project is $13,000.
The anticipated schedule of the project is as follows:
Award Contract
Start Construction
Substantial Completion
October 23,2007
October 24,2007
May, 2008
RECOMMENDA TION
Staff recommends that City Council approve expenditure of funds and award a
contract to Sunram Construction in the amount of $25,000 for the Lake Riley
Woods Raingardens Project, SWMPI2-035A.
Attachments
g:\eng\swmp files\lake riley woods\! 02207 approve funds Irw raingardens.doc
Lake Riley Woods Rain Gardens
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Capital Improvement Program
City of Chanhassen, MN
2007 thru 2011
Project #
SWMP-012
Project Name SWMP Implementation
Aeeount # 1 720-0000-4300
Aeeount #2
Aeeount # 3
Contact Unassigned
Department Surface Water Management
Type Improvement
Useful Life Unassigned
Category SWMP
Priority nla
Total Project Cost $1,650,000
Description I
This project implements projects identified as high priority by the City's Surface Water Management Plan, the National Pollutant Discharge
_ Elimination System (NPDES) Phase II permit, City Council and/or City staff.
Justification I
These projects are necessary to meet state and federal government requirements for storm drainage; address storm water issues in existing
developments; maintain existing infrastructure; and construct the infrastructure recommended by the City's Surface Water Management Plan.
Expenditures
Construction
2007
450,000
Total 450,000
2008
300,000
300,000
2009
300.000
300,000
2010
300.000
300,000
_ Funding Sources
Surface Water Utility Fund
Total
2007
450,000
450,000
2008
300.000
300,000
2009
300,000
300,000
2010
300,000
300,000
Operational Impact/Other I
Citywide. No map.
2011
300,000
300,000
Total
1,650,000
1,650,000
2011
300.000
300,000
Total
1,650,000
1,650,000
103