Engineering Comments 7-26-04CITYOF
CHANHASSEN
7700 Market Boulevard
PO Box 147
Chanhassen ~lla 55317
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MEMORANDUM
TO:
FROM:
DATE:
SUB J:
Sharmeen A1-Jaff, Senior Planner
Mak Sweidan, Engineer
July 26, 2004
Preliminary Plat Review of Frontier Second
Land Use Review File No. 04-10
Upon review of thc plans submitted by Kallio Engineering dated July 2nd, 2004, ]
off'er the following comments and recommendations'
GRADING, DRAINAGE & EROSION CONTROL
The existing site is heavily wooded with tree cover over approximately two acres
of area. Because of the heavily wooded nature of the site, the applicant is
proposing to custom grade each of the new housepads. Staff agrees that this is thc
most environmentally sensitive way to develop the site. Detailed grading,
drainage, tree removal and erosion control plans will be required for each of the
new lots at the time of building permit application for City review and approval.
In addition, as-built surveys will be required on each lot prior to occupancy.
The existing bluff area is between proposed Lots I and 2. There is a small portion
of two proposed retaining walls that encroaches into the required 30-foot structure
setback from the bluff. The retaining walls will need to be moved to comply with
the 30-foot setback requirement. The applicant should be aware that any retaining
wall over 4 feet in height must be designed by a Structural Engineer registered in
the State of Minnesota. Also, the walls will require building permits from the
Building Department. The plans propose to grade about 5% of the site to reroute
and stabilize the existing swale at the north easterly corner of the parcel. There is
a small portion of proposed grading which extends outside of the site limits. The
applicant must be aware that this off-site grading will require a temporary
easement fi'om the property owner.
The existing site drainage flows northeasterly toward the existing swale. The
applicant proposes to utilize the existing drainage swale along the east side of the
parcel which will maintain the neighborhood drainage pattern through the
property. Due to the lack of adequate stormwater ponding in the area, however,
staff is recommending that the applicant construct ponding either on site or on the
neighboring City-owned parcel to the east. The pond must be designed to NURP
standards and sized/located to minimize the amount of tree loss. The applicant
will be required to meet the existing site runoff rates for the 10-year and 100-year,
24-hour storm events.
Sharmeen Al-Jaff
July 26, 2004
Page 2
Erosion control measures and site restoration must be developed in accordance
with the City's Best Management Practice Handbook (BMPH). Tree preservation
fencing must be installed at the limits of tree removal. Silt fence must be used
around the grading area. All disturbed areas, as a result of construction, must be
seeded and mulched or sodded immediately after grading to minimize erosion.
UTILITIES
The plans propose on extending public sanitary sewer from an existing sanitary
structure on the northeasterly comer of the parcel. The proposed sanitary sewer
will run along the easterly side of the parcel and will service proposed Lots 1, 2
and 3. A permanent 20-foot wide drainage and utility easement is required over
the length of the new sewermain. Also, water services will be extended fi'om an
existing watermain in Frontier Trail on the west side of the parcel. The existing
Lots 4 and 5 already have sanitary and water services from West 77th Street.
Overall, the sanitary sewer layout looks fine. Upon completion of the sanitary
sewer improvements, it will be turned over to the City of Chanhassen for
maintenance and ownership.
According to the City's Finance Department records, the parcel was previously
assessed for street improvements along with one sanitary sewer and water hookup
unit for each of the existing homes on Lots 4 and 5. The remaining street
assessment balance with interest due payable to the City at the time of final plat
recording is $6,517.70. Since the developer will be responsible for extending
lateral sanitary sewer service to the new lots, the lateral sewer connection charges
will be waived; however, water connection charges will be required for each of
the new lots (1-3). In addition, sanitary sewer and water hookup charges will be
applicable for each of the new lots. The 2004 trunk hookup charge is $1,458
permit fei' sanitary sewer and $2,814 per unit for watermain. The 2004 lateral
connection charge for water is $4,739 per unit. Each of these charges is based on
the number of SAC units calculated by the Met Council and are due at the time of
building permit issuance. Sanitary sewer and watermain hookup fees may be
specially assessed against the parcel(s).
Public utility improvements are required to be constructed in accordance with the
City's latest edition of Standard Specifications and Detail Plates. Detailed
construction plans and specifications must be submitted at time of final plat for
review. The applicant is also required to enter into a development contract with
the City and supply the necessary financial security in the form of a letter of credit
or cash escrow to guarantee installation of the improvements and the conditions of
final plat approval. Permits from the appropriate regulatory agencies will have to
be obtained, including but not limited to the MPCA and Watershed District.
Sharmeen A1-Jaff
July 26, 2004
Page 3
STREETS
The plans do not show any public or private street improvements. The applicant is
proposing to utilize the existing street accesses off West 77th Street for Lots 4 and
5 and to construct new driveways for each of the three new Lots 1, 2 and 3 off
Frontier Trail.
RECOMMENDED CONDITIONS OF APPROVAL
1. The pond must be designed to NURP standards and sized/located to minimize
the amount of tree loss.
2. All disturbed areas, as a result of construction, must be seeded and mulched or
sodded immediately after grading to minimize erosion.
The applicant should be aware that any retaining wall over 4-feet in height
must be designed by a Structm'al Engineer registered in the State of
Minnesota. Also, it will require a building permit through the City's Building
Department.
4. Tree preservation fencing must be installed at the limits of tree removal.
On the Grading Plan:
a. Label the bluff setback limits.
b. Add silt fence adjacent to grading area.
c. Show the grading limits.
Add the following notes to the Utility Plan:
a. Any connection to existing structures must be core drilled.
b. All sanitary services must be 6"PVC-SDR26 and water services
l"copper.
7. The remaining street assessment balance with interest due payable to the City
at the time of final plat recording is $6,517.70. Since the developer will be
responsible for extending lateral sanitary sewer service to the new lots, the
lateral sewer connection charges will be waived; however, water connection
charges will be required for each of the new lots (1-3). In addition, sanitary
sewer and water hookup charges will be applicable for each of the new lots.
Public utility improvements are required to be constructed in accordance with
the City's latest edition of Standard Specifications and Detail Plates. Detailed
construction plans and specifications must be submitted at time of final plat
for review. The applicant is also required to enter into a development
contract with the City and supply the necessary financial security in the form
of a letter of credit or cash escrow to guarantee installation of the
Sharmeen Al-Jarl
July 26, 2004
Page 4
10.
12.
13.
14.
15.
16.
C:
improvements and the conditions of final plat approval.
The applicant must be aware that any off-site grading will require a temporary
easement fi'om the property owner.
Add the following City detail plates to the plans: 1005, 2001, 2002, 2101,
2109, 2110, 2201, 2202, 5300 and 5301.
On the preliminary plat sheet revise the north arrow sign.
On the Utility Plan:
a. Show the existing sanitary and watermain pipe size and type.
Detailed grading, drainage, tree removal and erosion control plans will be
required for each of the new lots at the time of building permit application fei'
City review and approval. In addition, as-built surveys will be required on
each lot prior to occupancy.
The retaining walls will need to be moved to comply with the 30-foot setback
requirement.
A permanent 20-foot wide drainage and utility easement is required over the
length of the new sewermain.
Paul Oehme, City Engineer/Public Works Director.
Matt Saam, Assistant City Engineer.
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