E. Water Treatment Plant Update
CITY OF
CHANHASSEN
7700 Market Boulevard
PO Box 147
Chanhassen, MN 55317
Administration
Phone 952.227.1100
Fax 952227.1110
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
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MEMORANDUM
TO:
Todd Gerhardt, City Manager
â,
Paul Oehme, City EngineerlDir. of Public Works <?' ;~
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FROM:
DATE:
January 3,2005
SUBJ:
Water Treatment Plant Update - Project No. 04-08
BACKGROUND
The City of Chanhassen provides municipal water to its residents from eight
wells. The raw water exceeds the recommended levels for both iron and
manganese and the arsenic levels are approaching the Maximum Contaminant
Level (MCL) of 10 parts per billion (ppb) in Well Nos. 5 and 6. Limited
sequestering treatment is provided with the addition of chlorine at the well
houses. Fluoride is also added at the well houses as required by the State of
Minnesota to prevent tooth decay. The average iron and manganese levels in
Well Nos. 2, 5 and 6 are 0.8 parts per million (ppm) and 0.3 ppm, respectively.
This is about 3 times the iron standard (0.3 ppm) and about 7 times the manganese
standard (0.05 ppm). These levels are too high for effective sequestering
treatment. Well Nos. 5 and 6 also have arsenic present at levels approaching the
MCL. Absorption of arsenic into the iron floc and subsequent filtration is
expected to reduce the arsenic levels by about 80% in the water treatment plant's
(WTP) finished water. Thus, the City desires to provide improved water quality
through the construction of a new WTP. It is anticipated a minimum of three to
four new wells will be needed in the future to provide additional supply capacity
that will be treated at the new WTP.
In preparation for the present WTP design, the following studies have been
pelformed:
1. Pilot Report for the Removal of Iron, Manganese and Arsenic, May 17,
2004. The pilot plant study confirmed the effectiveness of the proposed
treatment.
2. Distribution System Capacity Study, May 20, 2004. This computer model
study confirmed the existing distribution system is adequate to handle the
output from a new 6,000 gallon per minute (gpm) WTP located at the
Ready Mix Site.
3. Lotus Lake Well Siting Study, May 20,2004. This study confirmed the
glacial drift and Prairie du Chien-Jordan aquifers could each provide one
new 1,000 gpm (max. rate) well at both the WTP Ready Mix Site and the
South Lotus Lake Park Site.
The City 01 Chanhassen · A growing mmrnnMvBlü!:r1d3aT8~)l:tWalil\ü3!iìoo.\î~aó3~Ø>>mifi~ downtown, thriving businesses, winding trails, and beautiful parks. A great place to live, work, and play.
4. Preliminary Investigation Report, Lotus Lake Water Treatment Plant, May
24, 2004. This repOlt and subsequent review with the Minnesota
Department of Health confirmed the Ready Mix Site A to be the most
suitable for a new WTP.
5. Security system will include consideration of potential future homeland
defense security requirements and have a high level of automation. This
item will be addressed in more detail at the 60% review stage.
DISCUSSION
SEH received City Council approval to provide engineering services for a new
WTP on October 25, 2004. An initial kick-off meeting was held on November 4,
2004 followed by a complete design team kick-off meeting on December 9, 2004.
Preliminary design commenced for a 6,000 gpm iron, manganese and arsenic
removal WTP at the Ready Mix Site (Site A). The site is located between
Highway 5 and the Twin Cities and Western Railroad and just west of the
intersection of Highway 5 (Arboretum Boulevard) and Chanhassen Road. The
WTP will have the following features:
· Water Treatment
1. In-line pressure aeration.
2. Chlorine and potassium permanganate addition.
3. Gravity filtration using green sand and anthracite media.
4. Fluoride addition for prevention of tooth decay (state requirement).
5. Olthophosphate addition as a corrosion inhibitor.
· The WTP below-grade components and the filter cells will be constructed
with cast-in- place reinforced concrete.
· A finished water clearwell pumping chamber will be provided below the
WTP operating floor.
· The WTP above-grade components will be constructed with brick and
block.
· The WTP roof will be a blend of sloped standing seam metal roofs and flat
roofs with parapet perimeter walls.
· A bUlied Filter Backwash Tank will be constructed adjacent to the WTP.
It will also be constructed of poured-in-place concrete and provide for the
recycling of 90% water used in the filter backwash process.
· The WTP will include a control room, laboratory, meeting room, break
room and a uni -sex toilet, in addition to the basic treatment and pumping
facilities.
· A standby power generator will be provided to enable the WTP to operate
when the local electric power grid is inoperative.
G:\ENGIPUßLlCI04-08 Wl1'lbkgd 010305 work sessiou.doc
· The WTP operation will be tied into the City's SCADA system and be
designed for automatic un-manned operation.
· An emergency overflow system to prevent any damage due to equipment
malfunction or operator error. The local stormwater system must
accommodate this flow.
· A Security system will include consideration of potential future homeland
defense security requirements. This item will be studied at the 60%
design review.
The following items are submitted for the preliminary design review or will be
available at the work session for review:
1. Site Plan.
2. Floor Plan.
3. Typical WTP Cross Section.
4. Architectural Elevation.
5. Samples of Architectural Materials.
6. Preliminary List of Drawings and Specification Sections.
7. Preliminary Construction Cost Estimate and potential cost saving items.
SCHEDULE
The tentative schedule is as follows:
30% Design review
60% Design Review
90% Design Review
Approve Plans & Specifications
Open Bids
Stmt Construction
Start up of Treatment Plant
Alternate Start Up of Treatment Plant
Attachments
c: Jay Whitaker, SEH, Inc.
G:\ENGIPUBLlCl04-08 WTPlbkgd 010305 work session.doc
January 10,2005
February 28, 2005
April 11, 2005
May 9, 2005
June 2005
July 2005
August 2006
December 2006
j¿.
SEH
Chanhassen East Water Treatment Plant
Preliminary Construction Cost Estimate
January 3, 2005
Basic WTP in 2004 Dollars $9,000,000.00
(Including Sewer Availability Charge (SA V)
Inflation @ 5% $450,000.00
Deduct for Longer Construction Schedule ($300,000.00)
Engineering Fee $638,500
Subtotal $9,788,500.00
Contingency at 7.27% $711,500.00
TOTAL $10,500,000.00
Deduct for State Sales Tax Rebate (Reimbursement) ($300,000.00)
Net Total Cost $10,200,000.00
Short Elliott Hendrickson Inc., 3535 Vadnais Center Drive, 51. Paul, MN 55110-5196
5EH is an equal opportunity employer I www.sehinc.com I 651.490.2000 I 800.325.2055 I 651.490.2150 fax
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