Approval Letter 07-19-20110
CITY OF
CNANHASSEN
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
7901 Park Place
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
July 19, 2011
Mr. Paul Oehme, P.E.
Public Works Director
City of Chanhassen
7700 Market Boulevard
P. O. Box 147
Chanhassen, MN 55317
Re: Water Tower at Minnetonka Middle School West
Planning Case #2011 -05
Dear Mr. Oehme:
This letter is to confirm that on July 11, 2011, the Chanhassen City Council approved
the Site Plan for a 750,000 gallon water tower located at Minnetonka Middle School
West, plans prepared by SEH dated February 22, 2011, subject to the following
conditions:
1. The pedestal shall be painted sky blue if a steel shell, or if constructed of a
composite concrete material shall be stamped with architectural patterns to mimic
block or brick.
2. The light fixture shall have a 90- degree cut -off angle and be shielded from off -site
view.
3. Haul routes must be established for the trucking of material off the site.
4. A building permit is required for the retaining walls since they will be at least four
feet high.
5. The retaining walls must be designed by an engineer registered in the State of
Minnesota.
6. The following additional information must be shown on the grading plan:
a) Show the top and bottom of wall elevations.
b) Provide more spot elevations along the driveway and the area to the north of
the driveway, ensuring that minimum I% grade is achieved on paved surfaces
and minimum 2% grade is achieved in the green area.
Chanhassen is a Community for Life - Providing forTodayand Planning for Tomorrow
Mr. Paul Oehme
July 19, 2011
Page 2
7. A plumbing permit is required for the proposed sewer relocations.
8. Contact the Utility Department at 952- 227 -1300 a minimum of 48 hours before tapping into
the existing watermain. MnDOT permits are required for the proposed watermain and storm
water pond outlet pipe.
9. Tree protection fencing shall be installed at the edge of the grading limits.
10. A building permit is required.
11. Geotechnical investigation and report required.
12. All plans must be prepared and signed by design professionals licensed in the State of
Minnesota.
13. Portions of retaining wall(s) exceeding four feet in height must be professionally designed.
14. The owner and or their representative shall meet with the Inspections Division to discuss plan
review and permit procedures.
15. If the total disturbance exceeds one (1) acre in area an NPDES General Stormwater Permit
for Construction Activities will be needed from the MPCA.
16. If an NPDES Permit is needed, a Storm Water Pollution Prevention Plan will need to be
prepared and submitted for review and the conditions of the permit must be met.
17. The outlet to the right -of -way for MN Trunk Highway 41 will need to be stabilized
immediately upon connection.
18. The pond must be protected from sedimentation to the greatest extent practicable during
construction and all sediment deposited during construction must be removed to return the
pond to the design conditions. A record drawing shall be prepared showing this condition to
be met.
19. The plan must address the comments from the Carver County SWCD.
20. The proposed conditions will result in a decrease in runoff rate for the 2, 10 and 100 -year
events and an increase in total phosphorus and suspended solids removal.
21.The underdrain bedding material shall be washed river rock wrapped in a high -flow filter
fabric.
Mr. Paul Oehme
July 19, 2011
Page 3
22. According to the Carver County Soil Survey and double ring infiltrometer tests performed by
the School District, this site may well be conducive to infiltration. To this end an additional
hold down should be constructed below the underdrain such that the feature is a
filtration/partial recharge feature as described in the Minnesota Stormwater Manual.
23. Eliminate CBMH 109 and bulkhead the outlet from the upstream structure to the west. Move
CBMH 107 to the east into the location of the existing manhole. Replace this structure as
needed and outlet to the pond. The end result will be a single outlet point into the first cell
near the pinch point of the 1035 -foot contour.
All erosion control measures and tree protection fencing must be installed and inspected prior to
grading operations. If you have any questions or need additional information, please contact me
at (952) 227 -1131 or bgenerous@ci.chanhassen.mn.us
Sincerely.
Robert Generous, AICP
Senior Planner
RG:ktm
ec: Todd Gerhardt, City Manager
Kate Aanenson, Community Development Director
Jerry Mohn, Building Official
cc: Mr. Mike Condon, Independent School District #276
g: \plan\2011 planning cases \11 -05 water tower site plan \approval letter.doc