1 Minnetonka Middle School West Interim Use Permit 06-03
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February 7. 2006
PC DATE:
February 27. 2006
REVIEW DEADLINE: March 7, 2006
CASE #: 06-03
BY: RG, LH, JS, MS. ST
CC DATE:
CITY OF CHANHASSEN
STAFF REPORT
Request for an interim use permit to permit over 1,000 cubic yards of grading.
PROPOSAL:
(Highway 41)
d~
Hazeltine Boulevard
Minnetonka Public Schools
5621 County Road 101
Minnetonka, MN 55345
(952) 401-5039
6421
LOCATION:
APPLICANT:
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District,
Office & Institutional
PRESENT ZONING:
Public/Semi-Public
2020 LAND USE PLAN:
N/A
SUMMARY OF REQUEST: Request for an interim use permit to permit grading of approximately
3,400 cubic yards for the creation of a storm water infiltration basin.
LEVEL OF CITY DISCRETION IN DECISION-MAKING: The City has limited discretion in
approving or denying interim use permits, based on whether or not the proposal meets the use standards
outlined in the Zoning Ordinance. If the City finds that all the applicable use standards are met, the permit
must be approved. This is a quasi judicial decision.
DENSITY:
Approximately 40
ACREAGE:
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Location Map
Minnetonka Middle School West Interim Use Permit
Planning Case No. 06-03
6421 Hazeltine Boulevard
City of Chanhassen
Herman Reid Park
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West
Planning Commission
Minnetonka Middle School
Planning Case No. 06-03
February 7, 2006
Page 2 of 5
PROPOSAL
The Minnetonka School District is requesting an interim use permit to grade approximately 3,400 cubic
yards of material to construct an infiltration basin on the Minnetonka Middle School West property to
reduce downstream erosion and sedimentation along Highway 41.
interim use permit subject to the conditions of the staff report.
Staff is recommending approval of the
APPLICABLE REGUA TIONS
Chapter 7, Article III, Excavating, Mining, Filling and Grading
Chapter 20, Article IV, Division 2, Conditional Use Permits
Chapter 20, Article IV, Division 5, Interim Use Permits
BACKGROUND
On June 9,2003, City Council approved Interim Use Permit #2003-2 to permit grading in excess of 1,000
cubic yards to install a storm water pond and reconfigure the bus circulation route and parking area on the
north side of the school
ANALYSIS
GRADINGillRAINAGE/EROSION CONTROL
The applicant is requesting an interim use permit to grade approximately 3,400 cubic yards of material
to construct an infiltration basin on the existing school property to reduce downstream erosion and
sedimentation along Highway 41
The site drains from east to west, via an existing swale and two storm sewer lines, toward the existing
ditch along Highway 41. The swale is proposed to be filled and the 125-foot long existing southern
storm sewer will be removed. The plans show a proposed infiltration basin with three rows of 4-inch
draintile. The infiltration basin will receive drainage from the east side of the site and the existing
building's roof and discharge to the Highway 41 ditch through an 8-inch PVC pipe. The applicant must
verify that the existing 24-inch culvert along Highway 41 has sufficient capacity before replacing the
private drive entrance.
The applicant should be aware that if the fill is coming from and/or going to another site in Chanhassen
a separate grading permit will be required for the other property. Staff has not yet received a proposed
haul route as required. Staff is recommending that the applicant provide a proposed haul route for
review and approval. The hauling operation is anticipated to begin as soon as permit approval is
obtained. Permitted hours of operation will be 7:00 a.m. to 6:00 p.m., Monday through Friday, and 9:00
a.m. to 5:00 p.m. on Saturday with no work permitted on Sunday or legal holidays. The applicant
should be aware that any off-site grading will require an easement from the appropriate property owner.
Staff
Erosion control has been shown on the plan in accordance with the City's Standard Detail Plates
recommends that an erosion control blanket be installed on the sides of the infiltration basin. All
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West
Planning Commission
Minnetonka Middle School
Planning Case No. 06-03
February 7, 2006
Page 3 of 5
of construction are required to be sodded or reseeded and mulched within two
disturbed areas as a result
weeks of site grading.
An interim use permit expires one year from the date of approval from the City Council. The permit
may be renewed, however, on an annual basis subject to City Council approval. The applicant will need
to request a formal extension 45 days prior to the expiration date. Financial security to guarantee
restoration and erosion control measures will be required with the permit.
STORM WATER MANAGEMENT
The applicant should provide a cross section for the filtration area showing the elevation of the draintile
and the trenches, as well as a cross section of the trench and details of the material used. The drain tile
trenches should be lined with drainage fabric (4% to 6% open space) and filled with pea rock at a depth
of at least 18 inches and 3 feet wide. The bottom of the entire filtration basin should be backfilled with a
mixture of 50% coarse clean sand, 25% compost, 25% loamy topsoil for a minimum depth of 6 inches
(from approximately 1034.5 to 1035.0). The rest of the area should be top-dressed with native topsoil.
CB-l should be revised to be an open beehive inlet at an approximate elevation of 1037 for handling
large storm event runoff if the calculations for rate control work out to avoid overwhelming the filtration
area and having long periods (greater than 72 hours) of ponding.
EROSION AND SEDIMENT CONTROL
Erosion control blanket/turf reinforcement mat (MnDOT Category 5) should be used for restoration of
the exposed slope from the emergency overflow to the ditch along Highway 41 within 7 days of final
grade. The blanket should be specified and a detail provided. Erosion control blanket will also be
needed for any exposed soils south of the private drive within 24 hours of final grade. A seed mix for
shaded, wooded areas is needed. A seed mix should be specified in the plan with the rate of application
A seed mix for the filtration area and slopes will also be needed. The rip rap at the flared-end section at
the south end of the 24-inch pipe south of the private drive should be replaced.
Runoff from the storm sewer system from the school should be controlled during construction. The
water should be conveyed through a non-erosive means to the Highway 41 ditch through the job site. A
temporary slope drain or bypass pipe may be an option. (This could be a flexible temporary pipe placed
down the slope to the ditch with energy dissipation at the discharge point.) Erosion control blanket
category 2 or 3 is needed for the filtration area within 24 hours of connecting the 18-inch PVC to the
basin. The blanket must be applied following a seeding. Remaining exposed soils on site must be
mulched and seeded or sodded within 14 days of final grade.
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West
Planning Commission
Minnetonka Middle School
Planning Case No. 06-03
February 7, 2006
Page 4 of 5
RECOMMENDA TION
Staff recommends that the Planning Commission adopt the following motion
"The Planning Commission recommends approval of Interim Use Permit #06-03 to permit the grading of
approximately 3,400 cubic yards for a infiltration basin and drainage swales, plans prepared by Larson
Engineering of Minnesota, dated December 19, 2005 subject to the following conditions
The applicant shall provide the City with a cash escrow or letter of credit in the amount of $5,600.00 to
guarantee erosion control measures and site restoration and compliance with the interim use permit.
1
Verify the existing 24-inch culvert has sufficient capacity before replacing the private drive entrance
2
be
provide a proposed haul route for review and approval
If fill is coming from and/or going to another site in Chanhassen. a separate grading permit will
required for the other property.
must
The applicant
3
4
two
All disturbed areas as a result of construction are required to be reseeded and mulched within
weeks of site grading.
5
disturbed
two weeks
An erosion control blanket must be installed on all sides around the infiltration basin. All
areas as a result of construction are required to be sodded or reseeded and mulched within
6
of site grading.
size drainage area map.
a full
Submit
7
and 5302.
Plate No. 5301. The applicant shall construct and
Access to the site shall be restricted to this access
3102,3103.5300,5301
Show rock construction entrance per Detail
maintain a rock construction access to the site
3101
Nos
Plates
Add City Detail
8
9
requirements of the Watershed District and
permi t
obtain and comply with all
point only.
10. The applicant shall
MnDOT.
plans to match
12. The applicant shall supply the City with a mylar as-built survey prepared by a professional engineer
upon completion of filling and/or excavation to verify the grading plan has been performed in
compliance with the proposed plan
sewer flow direction in all
the existing storm
Revise
11
sewer pIpmg.
14. The applicant shall provide a cross section for the filtration area showing the elevation of the draintile
and the trenches, as well as a cross section of the trench and details of the material used. The draintile
A plumbing permit must be obtained before installing the storm
13
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West
Planning Commission
Minnetonka Middle School
Planning Case No. 06-03
February 7, 2006
Page 5 of 5
trenches shall be lined with drainage fabric (4% to 6% open space) and filled with pea rock at a depth of
at least 18 inches and 3 feet wide. The bottom of the entire filtration basin shall be backfilled with a
mixture of 50% coarse clean sand, 25% compost, 25% loamy topsoil for a minimum depth of 6 inches
(from approximately 1034.5 to 1035.0). The rest of the area shall be top-dressed with native topsoil.
CB-l shall be revised to be an open beehive inlet at an approximate elevation of 1037 for handling large
storm event runoff if the calculations for rate control work out to avoid overwhelming the filtration area
and having long periods (greater than 72 hours) of ponding.
15. Erosion control blanket/turf reinforcement mat (MnDOT Category 5) shall be used for restoration of the
exposed slope from the emergency overflow to the ditch along Highway 41 within 7 days of final grade.
The blanket shall be specified and a detail provided. Erosion control blanket shall be installed on any
exposed soils south of the private drive within 24 hours of final grade.
16. A seed mix for shaded, wooded areas shall be specified in the plan, along with the proposed rate of
application. A seed mix for the filtration area and slopes shall also be specified.
17. The rip rap at the flared-end section at the south end of the 24-inch pipe south of the private drive shall
be replaced.
The water
shall be controlled during construction.
Highway 41 ditch through the job site.
Runoff from the storm sewer system from the school
shall be conveyed through a non-erosive means to the
18
19. Erosion control blanket category 2 or 3 shall be installed within the filtration area within 24 hours of
> 18-inch PVC to the basin. The blanket shall be applied following a seeding. Remaining
m site shall be mulched and seeded or sodded within 14 days of final grade.
connecting the
exposed soils
20. The silt fence used shall be a City of Chanhassen type 1 silt fence; monofilament silt fence with metal
T-posts, 6 foot maximum spacing and 3 plastic zip ties in the top 8 inches ofthe fabric. The silt fence
specified for the filtration area shall be labeled as "Installed after drain tile installation"
the bituminous edge 40 to 50 feet long into the job
be installed from
pad shall
A rock construction exit
site.
21
be tracked upon paved surfaces.
if
be completed within 24 hours should soil
23. Catch basin inlet control shall be provided for the catch basins adjacent to the school building
tracking of soil becomes a problem on the paved surfaces"
22. Street sweeping shall
middle school west.doc
iup\staff report mtka
ATTACHMENTS
Findings of Fact and Recommendation
Development Review Application.
Reduced Copy Topographic Survey.
Reduced Copy Grading and Erosion Control Plan
Reduced Copy Utility Plan.
g:\plan\2006 planning cases\06-03 minnetonka middle school wes
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CITY OF CHANHASSEN
CARVER AND HENNEPIN COUNTIES, MINNESOTA
FINDINGS OF FACT
AND RECOMMENDATION
INRE:
Application of Minnetonka School District for an Interim Use Permit to permit the grading of
approximately 3,400 cubic yards for the creation of a storm water retention pond - Planning Case
No. 06-03.
On February 7, 2006, the Chanhassen Planning Commission met at its regularly
scheduled meeting to consider the application of Minnetonka School District for an interim use
permit for the property located at 6421 Hazeltine Boulevard (Highway 41). The Planning
Commission conducted a public hearing on the proposed interim use which was preceded by
published and mailed notice. The Planning Commission heard testimony from all interested
persons wishing to speak and now makes the following:
FINDINGS OF FACT
1 The property is currently zoned Office & Institutional District, 01.
2 The property is guided by the Land Use Plan for Public/Semi-Public use.
3 The legal description of the property is: Part of the SW 1,4 of the NW 1,4 of Section 3,
Township 116, Range 23, Carver County, Minnesota.
4 When approving an interim use permit the City follows the standards for conditional use
permits. The City must determine the capability of a proposed development with existing
and proposed uses. The city makes the following findings:
a. The proposed use will not be detrimental to the public health, safety, comfort,
convenience or general welfare of the neighborhood or the city, but will enhance
drainage and erosion issues in the area.
b. The proposed use will be consistent with the objectives of the city's comprehensive
plan and the Chanhassen City Code.
1
c. The proposed use will be designed, constructed, operated and maintained so to be
compatible in appearance with the existing or intended character of the general
vicinity and will not change the essential character of that area.
d. The proposed use will not be hazardous or disturbing to existing or planned
neighboring uses.
e. The proposed use will be served adequately by essential public facilities and services,
including streets, police and fire protection, drainage structures, refuse disposal, water
and sewer systems and schools; or will be served adequately by such facilities and
services provided by the persons or agencies responsible for the establishment of the
proposed use.
f. The proposed use will not create excessive requirements for public facilities and
services and will not be detrimental to the economic welfare of the community.
g. The proposed use will not involve uses, activities, processes, materials, equipment
and conditions of operation that will be detrimental to any persons, property or the
general welfare because of excessive production of traffic, noise, smoke, fumes, glare,
odors, rodents, or trash.
h. The proposed use will have vehicular approaches to the property which do not create
traffic congestion or interfere with traffic or surrounding public thoroughfares.
1. The proposed use will not result in the destruction, loss or damage of solar access,
natural, scenic or historic features of major significance.
J. The proposed use will be aesthetically compatible with the area.
k. The proposed use will not depreciate surrounding property values.
I. The proposed use will meet standards prescribed for certain uses as provided in the
City Code.
5. The planning report #06-03 dated February 7. 2006. prepared by Robert Generous, et al
is incorporated herein
2
RECOMMENDATION
The Planning Commission recommends that the City Council approve the interim
use permit.
ADOPTED by the Chanhassen Planning Commission this ih day of February, 2006.
CHANHASSEN PLANNING COMMISSION
BY:
Its Chairman
3
Planning Case No.
CITY OF CHANHASSEN
RECEIVED
CITY OF CHANHASSEN
7700 Market Boulevard - P.O. Box 147
Chanhassen, MN 55317 - (952) 227-1100
JAN 1 0 2006
CHANHASSEN PLANNING DEPT
Name and Address
DEVELOPMENT REVIEW APPLICATION
Fax:
Owner
Contact:
Phone:
Email:
1.-6
PLEASE PRINT
Applicant Name and Address
Ue:. ~
h 0
required prior to submittal. including review of development
Consultation with City staff is
NOTE
plans
Temporary Sales Permit
Comprehensive Plan Amendment
Right-of-Way/Easements (V AC)
Vacation of
(CUP)
Conditional Use Permit
1
Variance (VAR)
nterim Use Permit (IUP)
(WAP)
Wetland Alteration Permit
Non-conforming Use Permit
Zoning Appeal
Development*
Planned Unit
Zoning Ordinance Amendment
Rezoning
E~W for Filing Fees/Attorney Cost**
- 50 UP/SPRNACNARlWAP/Metes & Bounds
- , 0 Minor SUB pd '-{ 26" (j(, q 02-12..
TOTAL FEE $ t!;il!!. &/7S ~I 2-00 cJ:.. q 021 ,
, pd -:;{') ex.... 'io,q'j
the public hearing notification area will be invoiced to the applicant
Notification Sign - $200
(City to install and remove)
x:.
.
Sign Permits
x
Sign Plan Review
Site Plan Review (SPR)*
An additional fee of $3.00 per address within
prior to the public hearing
Subdivision*
*Sixteen (16) full-size folded copies of the plans must be submitted, including an 8%" X 11"
reduced copy for each plan sheet along with a diqital co in TIFF-Group 4 (*.tif) format.
the development contract.
be required for other applications through
**Escrow wi
be charged for
CCAtltlED
reviews
the appropriate fee sha
be submitted with site plan
NOTE: When multiple applications are processed
each application
Building material samples must
PROJECT NAME:
LOCATION
NO
/
YES
WETLANDS PRESENT:
PRESENT ZONING:
REQUESTED ZONING
PRESENT LAND USE DESIGNATION
This application must be completed in full and be typewritten or clearly printed and must be accompanied by all information
and plans required by applicable City Ordinance provisions. Before filing this application, you should confer with the
Planning Department to determine the specific ordinance and procedural requirements applicable to your application.
REQUESTED LAND USE DESIGNATION
A written
A determination of completeness of the application shall be made within 15 business days of application submittal
notice of application deficiencies shall be mailed to the applicant within 15 business days of application.
This is to certify that I am making application for the described action by the City and that I am responsible for complying with
all City requirements with regard to this request. This application should be processed in my name and I am the party whom
the City should contact regarding any matter pertaining to this application. I have attached a copy of proof of ownership
(either copy of Owner's Duplicate Certificate of Title, Abstract of Title or purchase agreement), or I am the authorized person
to make this application and the fee owner has also signed this application.
I will keep myself informed of the deadlines for submission of material and the progress of this application. I further
understand that additional fees may be charged for consulting fees, feasibility studies, etc. with an estimate prior to any
authorization to proceed with the study. The documents and information I have submitted are true and correct to the best of
my knowledge.
2/05
nCAlltlED
Rev.
Date
Signature of Fee Owner
G:\pLAN\forms\Development Review Application.DOC
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