A-1. West Water Treament Plant: Present 90% Plan Design IOW - I
CITY OF MEMORANDUM
C"" llIASS"N TO: Todd Gerhardt, City Manager
7700 Market Boulevard /� 0.
PO Box 147 FROM: Paul Oehme, Dir. of Public Works/City Engineer
Chanhassen,MN 55317
DATE: August 22, 2016
Administration
Phone:952.227.1100 SUBJ: West Water Filtration Plant Project No. 15-03: Preliminary Plan
Fax:952.227.1110 Review
Building Inspections
Phone:952.227.1180
Fax:952.227.1190 BACKGROUND
Engineering On February 22, 2016,the City Council approved a consultant contract with WSB
Phone:952.227.1160 and Associates for the West Water Filtration plant.
Fax:952.227.1170
Finance At the May 9, 2016 work session, the City Council was presented with the
Phone:952.227.1140 preliminary design for the West Water Filtration Plant.
Fax:952.227.1110
On June 2, 2016, an open house was held for the proposed project.
Park&Recreation
Phone:952.227.1120 At the June 27, 2016 work session,the City Council reviewed the preliminary design
Fax:952.227.1110 for the West Water Filtration Plant.
Recreation Center
2310 Coulter Boulevard On June 28, 2016,the proposed project was reviewed by the Park and Recreation
Phone:952.227.1400 Commission.
Fax:952.227.1404
On July 13, 2016, a Homeowner's Association meeting was held at the Chanhassen
Planning& Library.
Natural Resources y.
Phone:952.227.1130
Fax:952.227.1110 DISCUSSION
Public Works Since the work session on June 27, 2016, staff has been working on final design
7901 Park Place details.
Phone:952.227.1300
Fax:952.227.1310 The plant will be designed for the ultimate treatment capacity needs of the city and
Senior Center will bring all the western wells and future wells to the plant for iron and manganese
Phone:952.2271125 filtration. The iron and manganese filtration plant is planned for a total capacity of
Fax:952.227.1110 6,000 gpm. The plant is proposed to have a process that is very similar to the gravity
cast-in-place treatment process as the East Plant to provide consistency in the plant
Website operations and finished water quality. The plant would be designed so treated water
www.ci.chanhassen.mn.us will be able to be pumped in the low and high zones.
Chanhassen is a Community for Life-Providing for Today and Planning for Tomorrow
Todd Gerhardt
West Water Filtration Plant: Plan Update
August 22,2016
Page 2
Building Layout
The overall building length is 138' 4"and 80' wide. The greatest the building is visible above
ground is approximately 17' without the sloped roof.
Building Floor Plan
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Building Exterior Design and Landscaping
The goal of the site design is to have the building set into the hillside as much as possible to take
advantage of the topography, to decrease visual impacts, and to make the building look have a
residential feel as much as possible. The building's exterior is proposed to be built with
maintenance-free materials and finishes such as stone,manufactured stone products and brick. Staff
would like to use"earth tone"colors for exterior finishes. Doors and windows, as well as, other
fenestration are to have a residential architectural quality. Faux doors will be included on the north
east and south side of the building to break up the building wall length. Faux windows will also be
added to the upper portion of the building for a more residential feel. Below are renderings of the
proposed building.
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presentations 082i16 bkgd cc ws plan review wwtp.doc
Todd Gerhardt
West Water Filtration Plant: Plan Update
August 22,2016
Page 3
View Looking East
View Looking North
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View Looking West
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The sloped roof is proposed to have steel shingles that look like asphalt shingles but are more
durable.
The use of evergreens and berms will be used at strategic locations to visually break up the building.
The rest of the site and park will have additional landscaping with mainly deciduous trees.
Stormwater runoff will be treated in the existing pond to the west of the building. The size of the
pond will need to be increased slightly to meet water quality requirements. Water reuse is proposed
to be used to irrigate the turfed area of the site.
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Todd Gerhardt
West Water Filtration Plant: Plan Update
August 22,2016
Page 4
Preliminary Cost Estimate
The engineer's opinion of probable construction cost is $19.72 Million which includes constructing
the raw water lines from the west wells to the plant.
The City has made application through the Minnesota Department of Health for grant and loan funds
to assist in financing the plant. These funds come with specific requirements that would add cost to
the plant construction but would lock in the interest rate at 1%which is significantly below the rate
the City could sell bonds at. The loan funds are part of the state bonding program. Since there was
no state bonding this year, it is unlikely these loan funds will be available this year. Staff should
know in a few months if loan funds are available for this project.
Site Acquisition
The City purchased the site for the filtration plant in 2005 at the time the Lake Harrison development
was approved. The City identified several sites for the future plant before the purchase was made.
The parcel the City purchased was viewed as the best site for a future filtration plant. The site of the
Children's Learning Center at the corner of W. 78th Street and Galpin Boulevard was one of the sites
the City evaluated for the future filtration plant. The Children's Learning Center does have an outlot
that is currently not being developed. This outlot is large enough for the filtration plant. It is
estimated the outlot would be valued at about$930,000. The soils in the area are known to be poor
and it is likely a building constructed on the outlot would need to be supported by piling or other
structural techniques. The estimate for additional soil correction or building supports is $260,000.
The cost to extend raw water main from the current location to the plant and the necessary truck
distribution water main is estimated to cost$1,575,000. A preliminary estimate to construct the
plant at the daycare site is $2,765,000 more than the proposed site. If the plant were to be
constructed farther south of W. 78th Street, the cost for constructing the trunk water main and the
distribution main would be significantly higher. Staff also did contact the property owner of the
daycare site. The outlot is not for sale. No other property in the area is currently for sale that would
meet the need for a water plant.
SCHEDULE
Planning Commission Meeting September 6, 2016
City Council Approves Bidding Documents September 12, 2016
Bid Opening October 11, 2016
City Council Considers Award of Construction Contract October 24, 2016
Construction November, 2016—April,2018
Water Filtration Plant Start-up April, 2018
c: Greg Johnson, WSB &Associates
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