9a. Sanitary Sewer and Watermain Facilities in MUSA Expansion Area 0
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CITYOF ■■•■••■•111IMM
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, , 4 cHANHAssEN
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iow 690 COULTER DRIVE • • P.O. BOX 147 • • CHANHASSEN, MINNESOTA 55317
. (612) 937 -1900 •FAX (612) 937 -5739 Acton by r. `� / � sr -
II MEMORANDUM RE •
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TO: Don Ashworth, City Manager CA\ hE;� �,: 0\1"..' 1 FROM: Charles Folch, City Engineer ; ""
DATE: February 4, 1992 7"-0-
II SUBJ ,
Receive Report on Trunk Sanitary Sewer and Watermain
Facility Improvements in the MUSA Expansion Area
II Project No. 91 -12
In the spring of 1991, the Metro.itan Council approved the City
I of Chanhassen's amended Compr - Re -ive Plan which included the
addition of approximately 2800 -,„ of land into the Metropolitan
Urban Service Area MUSA . Be r« re
( ) y development could occur in
I the MUSA expansion area, it v.(
imp - � ative to perform a study on
the trunk sanitary sewer and terms facility needs. Following
a selection process, the consc cons tin g e '= ineering firm of Bonestroo,
I Rosene, Anderlik & Associates (BRA) as authorized by the City
Council to perform the nee. - d study.
As the study was being c "ucted, it beme apparent that in order
I to properly determine °e needs of thi area two large adjacent
areas (the 1995 study eas and the Lake - -.- iley area) , also needed
to be evaluated con0 rrently. Continui investigation revealed
II additional fundamental questions regardi Chanhassen's ultimate
sewer and Ovate . 1 , .. : ,, Y° , ;, _ %. e need for a more
comprehensive °ana - - • ultimate needs of the
II City. Thus, h`" e ara t � --- �.,.- •• - � ary Sewer
Policy Plan ahr , ja Co mprehensive Water Supply and Dis .cation Plan
were ordered in''eer, 1991. These compre a plans are
expected to be complete"'d'
II
The MUSA expansion area is defe ge nerally defined as that area
west of Audubon Road, south Lucy Road, east of Trunk
I ''
Highway 41 and north of Lyman B..evard. The entire area has been
divided into five districts: Lake Lucy, sake Ann, Upper Bluff
Creek, Lower Bluff Creek and Lake Riley. The recommended sanitary
I sewer and watermain facility improvements have been designed to
meet the ultimate needs of the respective district and provide
adequate capacity for the system, as a whole, when the City has
reach its full development (ultimate saturation) population.
II
Pt PRINTED ON RECYCLED PAPER
I
/I
Don Ashworth 1
February 4, 1992
Page 2
The recommended system improvements include trunk sanitary sewer
and watermains, five lift stations and associated forcemains,
future wells and three elevated water storage facilities.
Discussion is also provided on future inter - community water
connection as recommended by the Metropolitan Council's recent
"Metropolitan Area Water Supply Plan ".
During this MUSA study process, staff and Mr. Robert Schunicht of
BRA, the project consultant engineer, have been working with the
Metropolitan Waste Control Commission (MWCC) to receive additional
flow capacity for the City from the unallocated excess capacity in
the Red Rock Interceptor in Eden Prairie. Following further 11 investigation and numerous discussions, the MWCC has granted-
Chanhassen an additional 3 million gallons per day (MGD) of
capacity in the Red Rock Interceptor, yielding a total capacity
allocation of 16.1 MGD for the City. Chanhassen's estimated total
flow at saturation population is 18.8 million gallons per day.
However, given future infiltration /inflow (I /I) reduction and
potential flow diversion and surcharging, it may possible for
the Red Rock Interceptor to serve nearly all of Chanhassen's
sanitary sewer needs.
Mr. Schunicht will be on hand at the City Council meeting on 1
February 10, 1992 to provide a presentation of this study and the
associated findings.
Therefore, it is recommended that this report be adopted as the
P P
interim guide for trunk sanitary sewer and watermain systems in the
MUSA expansion area, pending completion of the Comprehensive Sewer 1
Policy Plan and the Comprehensive Water Supply Distribution Plan
and that the following charge system be adopted for financing the
trunk sanitary sewer and water systems: 1
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Don Ashworth
February 4, 1992
Page 3
1 Land Use Type Units/ Trunk San. Sewer Trunk Watgrmain
1 S /Ac. Cad 5970/REU ** S /Ac. Ccr) 51275/REU
Single Family Res. 2 $1,900 $2,540
Medium Density Res. 3 Z850 3,810
High Density Res. 6 5,700 7,620
Commercial/Industrial 4 3,800 5,080
Public 2 1,900 2540
*Net developable area excluding wetlands and major roadways
1 * *Residential Equivalent Unit
1 ktm
Attachment: MUSA Expansion Area Study Report dated February, 1992.
' c: Bob Schunicht, BRA
Dave Hempel, Sr. Engineering Technician
Jerry Boucher, Utility Superintendent
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