3b Final Plat Approval
CITY OF
CHANHASSEN
7700 Markel Boulevard
PO Box 147
Chanhassen, MN55317
Administration
Phone: 9522271100
fax: 9522271110
Building Inspections
Phone: 9522271180
fax 952,2271190
Engineering
Phone: 9522271160
fax 952,227.1170
Finance
Phone: 9522271140
fax 952227.1110
Park & Recreation
Phone: 9522271120
fax 952.2271110
RecreationCenler
2310 Couller Boulevard
Phone: 9522271400
fax 9522271404
Planning &
Natural Resources
Phone: 9522271130
fax 952.2271110
Public Works
1591 Park Road
Phone 952227.1300
fax: 952227.1310
Senior Center
Phone: 952227.1125
fax: 952227.1110
Web Site
WWN.ci.chanhassen.mn.us
MEMORANDUM
TO:
Todd Gerhardt, City Manager
36.
The City of Chanhassen . A growing community with clean lakes, quality schools, a charming downtown, thriving businesses, winding !rails, and beautiful parks. A great place 10 live, work. and play
FROM:
Bob Generous, Senior Planner
DATE:
~.
May 23, 2005
SUBJ:
Final Plat Approval for Gateway East 2nd Addition
Planning Case No. 05-12
PROPOSAL SUMMARY
The applicant, City of Chanhassen, is requesting final plat approval for Gateway
East 2nd Addition creating two lots and one outlot. The proposal includes
approximately 3.94 acres. The development complies with the Highway and
Business Services District, BH, regulations. Approval requires a majority of City
Council present.
BACKGROUND
On April 25, 2005, the Chanhassen City Council approved the following:
Land Use Amendment from Parks and Open Space to Commercial;
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 conditions;
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 I, Gateway East 2nd Addition.
FINAL PLAT
PROPOSAL SUMMARY
The applicant is requesting final plat approval for two lots and one outlot.
GRADING, DRAINAGE & EROSION CONTROL
The existing site ranges from a high elevation of 978 in the west central portion of
the site down to a low point of 940 in the southeast corner. The plans propose to
grade about 60% of the site for a water treatment plant, a proposed street with a
cul-de-sac, and a stormwater pond. While the finished floor elevation of the
treatment plan is set at 969.0, the site cannot be graded down to this elevation
because of the existing pedestrian bridge. The development does a nice job of
Todd Gerhardt
Gateway East 2nd Addition
May 23, 2005
Page 2
working with this constraint and matching into the existing 978 elevation along the east side of
the building. Because of the need to hold the 978 ground elevation near the pedestrian bridge, a
retaining wall (6' - 10') will be required along the north side of the backwash tanks adjacent to
the south side of the street and trail. This retaining wall will require a building permit from the
City's Building Department.
The existing site drainage is encompassed within two different drainage areas. Under existing
conditions, the westernmost portion of the site drains off site to the west while the remainder of
the site drains to an existing storm sewer culvert in the southeast corner of the site. Under
developed conditions, the applicant is proposing to capture the eastern half of the street drainage,
all of the Lot 2 drainage, and a large majority of the Lot 1 drainage. This stormwater will be
conveyed via storm sewer and overland flow to the proposed pond in the southeasterly corner of
the site for treatment. The remaining impervious runoff from the street and treatment plant will
drain to an existing storm sewer in West 79th Street which flows to an existing pond in the
downtown area. The proposed pond must be designed to National Urban Runoff Program
(NURP) standards with maximum 3:1 side slopes and a 10:1 safety bench at the NWL. An outlet
control structure, per City Detail Plate No. 3109, must be installed at the outlet of the pond.
Drainage calculations for the site have been submitted. The applicant is required to meet the
existing site runoff rates for the lO-year and l00-year, 24-hour storm events.
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.
These requirements are included in the construction contract.
UTILITIES
Municipal sanitary sewer is available to the site from the south. There is an existing sanitary
sewer main along the southern property line which the applicant is proposing to connect to an
existing sanitary manhole. As for water, the treatment plant itself will have multiple water lines
coming to/from the building. These watermains include typical distribution mains, raw
watermains to carry water directly from the wells to the treatment plant, a reclaim watermain
which will carry a portion of the filter backwash water back to the plant for treatment, and
spraywash mains which give the Utility Department staff the ability to clean out the backwash
tanks. The actual potable water service to the plant will come from the south side of the building
off a relocated watermain. 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.
Todd Gerhardt
Gateway East 2nd Addition
May 23, 2005
Page 3
STREETS
The plans propose on extending West 79th Street approximately 250 feet east of its current
terminus to serve the two proposed lots. Because this street will be extended within public or
City-owned property, additional public right-of-way is not necessary. The existing pavement
width of West 79th Street is 27 feet from back-of-curb to back-of-curb. The standard pavement
width for public streets in commerciallbusiness districts in Chanhassen is 36 feet from back-of-
curb to back-of-curb with a 48-foot cul-de-sac radius. In this case, staff is fine with the street
width staying at 27 feet in order to stay consistent with the existing street width to the west. The
cul-de-sac pavement radius is proposed at 60-feet. This radius exceeds the current standard and
will provide greater area for semi-trucks to turnaround.
With the expected increase in traffic on West 79th Street from deliveries to the treatment plant
and the future development of Lot 2, staff is recommending that additional signage be installed
near the existing Hanus Building just west of the site. The signage is needed because of the
existing blind approach to motorists leaving Brown's Auto and conversely to motorists heading
west from the new treatment plant. This requirement is included in the contract documents.
LANDSCAPING
The landscape plan for the plat is being provided with the water treatment plant and has been
developed to reflect the natural materials used in the building. Native trees, shrubs, and grasses
as well as non-native perennials and shrubs have been utilized to create a naturalized planting
plan. The guiding factors for selection and placement were attractiveness and low-maintenance.
Additional landscaping will be provided in the future as part of the site plan for Lot 2.
COMPLIANCE TABLE
AREA (sq. ft.) Frontage (ft.) Depth (ft.) Setbacks: Front,
Side Rear (ft.)
Code 20,000 100 150 25, 10,20
LotI 108,404 565 195 25, 10, NA (double
front)
Lot 2 60,537 151 302 25, 10 NA (double
front)
Outlot A 2,890
Total 171831
REVIEW OF CONDITIONS OF APPROVAL
I. The applicant is required to meet the existing site runoff rates for the lO-year and loo-year, 24-
hour storm events. The proposed pond must be designed to National Urban Runoff Program
(NURP) standards.
* This condition has been met.
Todd Gerhardt
Gateway East 2nd Addition
May 23, 2005
Page 4
2. The storm sewer must be designed for a lO-year, 24-hour storm event. Submit storm sewer
sizing calculations and drainage map prior to final plat for staff review and approval.
* This condition has been met.
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 l00-year flood level.
The minimum easement width must be 20 feet wide.
* This condition has been met.
4. An access easement for the benefit of Lot 2 shall be recorded across Lot 1.
* This condition still applies.
5. Submit a separate site plan, grading/drainage/erosion control plan, and utility plan.
* This condition has been met.
6. Pedestrian ramps per City Detail Plate No. 5215 are required at the street crossing of the
proposed trail.
* This condition has been met.
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.
* This condition has been met.
8. On the site plan, show the dimensions for street width, cul-de-sac radius, parking stalls, trail, etc.
* This condition still applies.
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.
* This condition has been met.
10. The proposed retaining wall along the north side of the backwash tanks will require a building
permit from the City's Building Department.
;,
Todd Gerhardt
Gateway East 2nd Addition
May 23, 2005
Page 5
* This condition still applies.
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.
* This condition still applies.
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.
* This condition has been met.
13. Additional signage shall be installed alerting motorists to the blind approach near the existing
Hanus Building just west of the site.
* This condition still applies.
14. The applicant shall work with the watershed district to provide regional water quality
infrastructure on this site.
* This condition still applies.
15. The flow path and velocity of the water from the flared end sections to the storm water shall be
evaluated.
* This condition has been met.
16. A Storm Water Pollution Prevention Plan (SWPPP) encompassing an erosion and sediment
control plan shall be developed for the site.
* This condition still applies.
17. Temporary and permanent erosion control plans and details shall be developed.
* This condition has been met.
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.
Todd Gerhardt
Gateway East 2nd Addition
May 23, 2005
Page 6
* This condition still applies.
19. Energy dissipation shall be provided at the flared end sections.
* This condition still applies.
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 Time
Steeper than 3: 1
10:1 to 3:1
Flatter than 10: 1
(Maximum time an area can
7 days remain open when the area
14 daysis not actively being worked.)
21 days
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.
* This condition still applies.
21. Street cleaning of soil tracked onto public streets shall include daily street scraping and street
sweeping as-needed.
* This condition still applies.
22. Inlet protection shall be provided following installation. Wimco-type inlet controls are
recommended.
* This condition still applies.
23. A rock construction entrance shall be provided from the site to West 79th Street.
* This condition has been met.
24. Chanhassen Type I silt fence shall be installed around the south and east sides of the site.
* This condition has been met.
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 Department of Natural Resources (for dewatering), Minnesota Department of Health,
Minnesota Department of Transportation) and comply with their conditions of approval.
* This condition still applies.
Todd Gerhardt
Gateway East 2nd Addition
May 23. 2005
Page 7
RECOMMENDATION
Staff recommends that the City Council adopt the following motion:
'The Chanhassen City Council approves the Final Plat for Gateway East 2nd Addition creating two
lots and one outlot (plans prepared by Hansen Thorp Pellinen & Olson, Inc.) subject to the
following conditions:
1. An access easement for the benefit of Lot 2 shall be recorded across Lot 1.
2. On the site plan, show the dimensions for street width, cul-de-sac radius, parking stalls, trail, etc.
3. The proposed retaining wall along the north side of the backwash tanks will require a building
permit from the City's Building Department.
4. 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.
5. Additional signage shall be installed alerting motorists to the blind approach near the existing
Hanus Building just west of the site.
6. The applicant shall work with the watershed district to provide regional water quality
infrastructure on this site.
7. The flow path and velocity of the water from the flared end sections to the storm water shall be
evaluated.
8. A Storm Water Pollution Prevention Plan (SWPPP) encompassing an erosion and sediment
control plan shall be developed for the site.
9. 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.
10. Energy dissipation shall be provided at the flared end sections.
11. All exposed soil areas shall have temporary erosion protection or permanent cover year round,
according to the following table of slopes and time frames:
Todd Gerhardt
Gateway East 2nd Addition
May 23, 2005
Page 8
Type of Slope
Steeper than 3: 1
10:1 t03:1
Flatter than 10: 1
Time (Maximum time an area can
7 days remain open when the area
14 daysis not actively being worked.)
21 days
12. 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.
13. Street cleaning of soil tracked onto public streets shall include daily street scraping and street
sweeping as-needed.
14. Inlet protection shall be provided following installation. Wimco-type inlet controls are
recommended.
15. 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 Department of Natural Resources (for dewatering), Minnesota Department of Health,
and Minnesota Department of Transportation) and comply with their conditions of approval.
ATTACHMENTS
1. Final plat.
g:\plan\2005 planning cases\OS-12 water treatment plant\fina1 plat gateway east 2nd.doc
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