1c. Cimarron HOA Stormwater Management (Rain Garden) Project
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
WNw.ci .chanhassen .mn. us
ie
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MEMORANDUM
Paul Oehme, Public Works Director/City Engineer '?- {j .
TO:
FROM:
Terrance Jeffery, Water Resources Coordinator
DATE:
August 24, 2009
o~.
SUBJ:
Cimarron HOA Stormwater Management (Raingarden) Project
SWMP-09-03 : Award of Contract
PROPOSED MOTION
"The City Council approves a landscaping contract in the amount of
$26,169.48 with Hoffman & McNamara Company for work to be performed on
the Cimarron Raingarden project."
City Council approval requires a simple majority vote of the City Council
present.
BACKGROUND
The watershed known as the West Central Lotus Lake watershed has been a
priority ofChanhassen's since the 2005 storm event resulted in failure of the inlet
channel into Lotus Lake. Part of the solution was to provide additional rate
control, treatment and storage within the Meadow Green wetland complex and the
drainage swale north of Bighorn Drive. Even with these improvements, there are
known capacity issues within the storm sewer system and additional volume
reduction is needed.
In the fall of 2008, City staff was approached by the Homeowners Association for
the Cimarron Townhome Association. They wanted to improve their landscaping
and felt it would be a good opportunity to provide a larger benefit to the
community. Staff met with the HOA board on four separate occasions, hosted a
rain garden training seminar cooperatively with the Lower MN River Watershed
District and Blue Thumb and received a deluge of requests.
Staff contacted the Carver County Soil and Water Conservation District and they
offered to assist in the design of the raingardens at a much reduced rate from what
a consultant would command. All total, thirty-three residents expressed a desire
to be included in the project. Unfortunately, a majority of these properties were
not well suited to infiltration features without significant engineering costs due to
slope issues. Further, a number of additional sites were inappropriate because of
snow removal or other infrastructure conflicts.
Chanhassen is a Community for Life. Providing for Today and Planning for Tomorrow
Paul Oehme
Cimarron HOA Stormwater Mgmt.
August 24, 2009
Page 2
After removing from consideration those areas which were not conducive to a
raingarden, eleven sites were selected. Since this time, three residents have
elected not to be involved. .
After installation of raingardens is complete, City staff will work with
homeowners to train them on proper maintenance. The homeowners will then be
responsible for maintenance ofthe features with the City providing mulch.
BIDS
Requests for proposal were submitted to four landscaping contractors on April 9,
2009. Mustard Seed and Natural Surroundings chose not to propose on the
project for reasons unknown. The bids received are as follows:
$26,169.48
Earth Wizards, Inc. $36,403.52
*The SWCD's opinion of total project cost was $38,410.00.
Hoffman & McNamara recently completed the Kerber Pond Landscaping project.
Staff was impressed with the quality of their work and with their willingness and
ability to work with the public. This is of particular importance as these features
will be retrofitted on to private property.
The project will begin the week of August 24 with substantial completion by the
second week in September.
This project was budgeted for 2009 in CIP Project SWMP-033. Funding for the
project is proposed from the Surface Water Management Fund. In a letter to the
Riley- Purgatory-Bluff Creek Watershed District in January of 2009, the City
inquired as to their interest in being involved in the project. At that time, the
District elected to not become involved in the project. Within the last two weeks,
staff was contacted by the District and asked to petition for this project in the
2010 fiscal year. Staffis also working with the Carver County Soil and Water
Conservation District to procure additional funds from the Natural Resources
Block Grant. It is unclear, due to certain requirements, if this project will meet
the criteria for funding. However, based upon conversations between staff and the
SWCD, staff remains optimistic that some level of partnership can happen.
Attachments: 1. CIP Page
2. Project Area Map
c: Mike McNamara, Hoffman & McNamara
g:\eng\swmp projects\swmp 2009-03 cimmaron hoa raingarden project\award construction_082409.doc
Capital Improvement Program
City of Chanhassen, MN
2009 thrn 2013
Account # 1 720-0000-4300
Account # 3
Contact Paul Oehme
Department Surface Water Management
Type hnprovement
Useful Life
Category SWMP
Priority n/a
Project #
SWMP-033
ProjectName Cimmaron BOA Stormwater Management Project
Account #2
Description I
The Cimmaron ROA approached the City about utilizing raingardens and other alternative stormwater management best management practices as
they redo their landscaping. They requested assistance in design, placement and financing ofthe project. The City, with the help ofthe Carver
County Soil and Water Conservation District will identify, design and construct alternative Best Management Practices for stormwater
management throughout the neighborhood. A meeting with the Homeowner's Association indicated a willingness to supply the land and longterm
maintenance of the features. The work can be done concurrently with the mill and overlay project scheduled for the neighborhood in 2009.
Total Project Cost $50,000
Justification I
The Cimmaron neighborhood drains into the Triple Crown Estates pond watershed prior to discharge into Lotus Lake. This watershed is known to
have inadequate conveyance, storage, volume management and water quality treatment. This neighborhood is at the origin of the watershed and
would be well suited to volume reduction and water quality treatment as well as offering rate control. This project will address issues identified in
Chanhassen's Second generation Surface Water Management Plan and in Chanhassen's Nondegradation Plan.
Expenditures
Construction
2009
40,000
40,000
2010
10,000
10,000
2011
2012
2013
Total
50,000
50,000
Total
Funding Sources 2009 2010 2011 2012 2013 Total
Other Agency Contribution 2,500 7,500 10,000
Surface Water Utility Fund 37,500 2,500 40,000
Total 40,000 10,000 50,000
Operational Impact/Other
This will need to be coordinated with the scheduled mill and overlay project.
119
Cimmaron HOA Stormwater Management Location
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