Approval Letter 4-27-05
CITY 0 F
CHANHASSEN
7700 Markel Bou levard
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
VNNI.ci .chanhassen. mn .us
April 27, 2005
Mr. Paul Oehme
City of Chanhassen
P. O. Box 147
Chanhassen, MN 55317
Re: Planning Case #05-12
Land Use Amendment
Preliminary Plat Approval - Gateway East 2nd Addition
Site Plan Approval Water Treatment Plant
Dear Paul:
On April 25, 2005, the Chanhassen City Council approved the following:
Land Use Amendment from Parks and Open Space to Commercial contingent
upon Metropolitan Council Review.
And,
Preliminary plat for Gateway East 2nd Addition creating two lots and one outlot,
plans prepared by Hanson Thorp Pellinen Olson, Inc., dated February 9,2005,
revised February 26, 2005, subject to the following conditions:
1. The applicant is required to meet the existing site runoff rates for the lO-year
and 100-year, 24-hour storm events. The proposed pond must be designed to
National Urban Runoff Program (NURP) standards.
2. The stOlID sewer must be designed for a lO-year, 24-hour storm event.
Submit stOlID sewer sizing calculations and drainage map prior to final plat for
staff review and approval.
3. Drainage and utility easements must be dedicated on the final plat over the
public storm drainage system including ponds, drainage swales, and wetlands
up to the 100-year flood level. The minimum easement width must be 20 feet
wide.
4. An access easement for the benefit of Lot 2 shall be recorded across Lot 1.
5. Submit a separate site plan, grading/drainage/erosion control plan, and utility
plan.
6. Pedestrian ramps per City Detail Plate No. 5215 are required at the street
crossing of the proposed trail.
The City of Chanhassen . A growing community with clean lakes, quality schools, a charming downtown, thriving businesses, winding trails, and beautiful parks. A great place to live, work, and play.
Mr. Paul Oehme
April 27, 2005
Gateway East 2nd Addition
Page 2
7. On the grading plan:
a. Show all existing and proposed easements.
b. Show the benchmark used for the site survey.
c. Show all proposed contour lines in bold.
d. Show the emergency overflow elevation from the proposed pond.
e. Show all proposed contours on the north side of the proposed trail and on Lot 2.
f. Do not show the proposed sanitary/water lines on the grading plan.
g. Show the proposed storm sewer to/from the pond.
8. On the site plan, show the dimensions for street width, cul-de-sac radius, parking stalls, trail,
etc.
9. On the utility plan:
a. Show all existing and proposed utilities.
b. Show the proposed rim and invert elevations for all sanitary and storm sewer.
1O. The proposed retaining wall along the north side of the backwash tanks will require a
building permit from the City's Building Department.
11. Proposed erosion control must be developed in accordance with the City's Best Management
Practice Handbook (BMPH). Staff recommends that Type I silt fence be used along the
entire south and west construction limits. A rock construction entrance, per City Detail Plate
No. 5301, must be added to the plans off of existing West 79th Street. In addition, tree
preservation fencing must be installed at the limits of tree removal. All disturbed areas, as a
result of construction, must be seeded and mulched or sodded immediately after grading to
minimize erosion. Any off-site grading will require an easement from the appropriate
property owner.
12. All of the utility improvements are required to be constructed in accordance with the City of
Chanhassen's latest edition of Standard Specifications and Detail Plates. Detailed
construction plans, including plan and profile drawings of the proposed utilities, are required
to be submitted at the time of final plat.
13. Additional signage shall be installed alerting motorists to the blind approach near the existing
Hanus Building just west of the site.
14. The applicant shall work with the watershed district to provide regional water quality
infrastructure on this site.
15. The flow path and velocity of the water from the flared end sections to the storm water shall
be evaluated.
16. A Storm Water Pollution Prevention Plan (SWPPP) encompassing an erosion and sediment
control plan shall be developed for the site.
17. Temporary and permanent erosion control plans and details shall be developed.
Mr. Paul Oehme
April 27, 2005
Gateway East 2nd Addition
Page 3
18. Erosion control blanket shall be applied to the storm water pond and any disturbed areas
between the flared end sections and the pond, as well as on any slopes greater than or equal
to 3: 1.
19. Energy dissipation shall be provided at the flared end sections.
20. All exposed soil areas shall have temporary erosion protection or permanent cover year
round, according to the following table of slopes and time frames:
Type of Slope
Steeper than 3: 1
1O:1 to 3:1
Flatter than 1O: 1
Time
7 days
14 days
21 days
(Maximum time an area can
remain open when the area
is not actively being worked.)
These areas include constructed storm water management pond side slopes, and any exposed
soil areas with a positive slope to a storm water conveyance system, such as a curb and gutter
system, storm sewer inlet, temporary or permanent drainage ditch or other natural or man
made systems that discharge to a surface water.
21. Street cleaning of soil tracked onto public streets shall include daily street scraping and street
sweeping as-needed.
22. Inlet protection shall be provided following installation. Wimco-type inlet controls are
recommended.
23. A rock construction entrance shall be provided from the site to West 79th Street.
24. Chanhassen Type I silt fence shall be installed around the south and east sides of the site.
25. The applicant shall apply for and obtain permits from the appropriate regulatory agencies (e.g.,
Riley-Purgatory-Bluff Creek Watershed District, Minnesota Pollution Control Agency,
Minnesota Depat1ment of Natural Resources (for dewatering), Minnesota Department of
Health, Minnesota Department of Transportation) and comply with their conditions of
approvaL"
And,
Site Plan Review for a 12,500 square-foot building for a water treatment plant and an 8,100 square-
foot back wash tank on Lot 1, Block 1, Gateway East 2nd Addition, based on the findings of fact
attached to this report and subject to the following conditions:
1. Tree protection fencing will be required at the edge of grading limits in the southwest comer
of the property prior to any grading.
2. Staff will coordinate the transplanting of any existing maples prior to construction.
Mr. Paul Oehme
April 27, 2005
Gateway East 2nd Addition
Page 4
3. City staff and the water treatment plant consultants will research and determine if alternative
ground covers can be used over the underground tanks.
4. Where appropriate, seeding will replace sod with the exception of along the curb line, trails
and adjacent to the building.
5. The building must be protected with an automatic fire sprinkler system.
6. The building plans must be prepared and signed by design professionals licensed in the State of
Minnesota.
7. One accessible parking space with an access aisle must be provided.
8. The west wall of the building must be of one-hour fire-resistive construction as it is located less
than 30 feet from the property line. Openings in this wall must be in accordance with the
building code.
9. The building owner and or their representatives shall meet with the Inspections Division to
discuss plan review and permit procedures.
1O. A site survey must be submitted in conjunction with the building permit application.
Pinal plat documents must be submitted to the city three weeks prior to the City Council meeting
in which you wish to have your final plat approved. Enclosed is the list of items required for
submittal for final plat approval.
Should you have any questions, please feel free to contact me at (952) 227-1131.
Sincerely,
~....~.
Robert Generous, AICP
Senior Planner
Enclosure
ec: Matt Saam, Assistant City Engineer
Steve Torell, Building Official
g:\plan\2005 planning cases\05-12 - water treatment plant\approvalletter.doc
ITEMS REQUIRED FOR FINAL PLAT CONSIDERATION
6/9/04
The following items are required to be submitted a minimum of three (3) weeks prior to City
Council meeting and payment of a $250.00 final plat review fee:
1. Submit three (3) sets of construction plans and specifications for staff review and redline.
The construction plans and specifications shall be in accordance to the City's latest edition
of Standard Specifications & Detail Plates. The plans shall include traffic signage and street
light placement. Utility plans shall show both plan view and profiles of all utilities (sanitary
sewer, water and storm sewer lines). Grading and drainage plans shall show dwelling type
and elevations, wetlands and wetland buffer areas, stormwater pond NWLS and HWLS,
catch basin, and storm manhole numbers.
2. Drainage calculations for water quantity and quality ponding with maps showing drainage
areas for pre-and post-development conditions and contributing areas to catch basins.
3. Tree Preservation Easements (if applicable).
4. Trail Easements (if applicable).
5. Landscape Plan and Cost Estimates (Woodland Management Plan, if applicable).
6. Engineer's Cost Estimate of Public Improvements:
a. Sanitary sewer system.
b. Water system.
c. StOlID sewer drainage system including cleaning and maintenance.
d. Streets, sidewalk and trails.
e. Erosion control.
f. Site restoration (seeding, sodding, etc.).
g. Site grading
7. Ten (10) sets (folded) of final plat, one (1) set of reductions (8Yz" x 11"), a digital copy in
.dwg fOlIDat (AutoCAD compatible), and a digital copy in .tif format.
8. Digital copy of the legal description of the property in a .doc or .pdf compatible format.
9. Lot tabulations
10. 1" = 200' scale paper or mylar reduction of the final plat with just street names and Lot and
Block numbers.
Pailure to provide any of the above items by the required deadline will result in delaying
consideration of final plat before the City Council.
g:\eng\forms\fnlplat submittal.doc