PC Staff Report 03-01-2022Planning Commission Item
March 1, 2022
Item
10500 and 10520 Great Plains Boulevard: Consider a Request for Conceptual
PUD Approval for a Mixed Use Planned Unit Development (PUD) Rezoning
on approximately 8.3 Acres with a Land Use Designation of Mixed
File No.Planning Case No. 2022-04 Item No: C.3
Agenda Section PUBLIC HEARINGS
Prepared By MacKenzie Young-Walters, Associate Planner
Applicant
RSI Marine
Rob Schatzle
1533 West 3rd Avenue
Shakopee, MN 55379
Present Zoning Fringe Business District (BF)
Land Use Mixed Use
Acerage 8.33 Acres
Density FAR: .22
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Applicable
Regulations
Chapter 19, Article IV, Subsurface Sewage Treatment Systems: States septic
system requirements and requires deviations from these standards to go through
Chapter 20’s variance process.
Chapter 19, Article VII, Surface Water Management: States standards required
to meet goals and policies of the City’s surface water management plan.
Chapter 20, Article II, Division 2, Amendments: States process for amending
the Zoning code.
Chapter 20, Article II, Division 3, Variances: States process and requirements
for granting variances.
Chapter 20, Article II, Division 6, Site Plan Review: States process and
requirements for granting site plan approval.
Chapter 20, Article VIII: Planned Unit Development District: States
expectations and requirements for Planned Unit Developments.
Chapter 20, Article XXIII, Division 7, Design Standards for Commercial,
Industrial and Office-Institutional Developments: Stipulates design standards
for Commercial, Industrial, and Office-Institutional developments.
Chapter 20, Article XXIV, Off-Street Parking and Loading: States parking lot
design and space requirements.
Chapter 20, Article XXV, Landscaping and Tree Removal: States landscaping
and tree preservation standards for developments.
Chapter 20, Article XXVI, Signs: States requirements for signage.
SUGGESTED ACTION
“The Chanhassen Planning Commission recommends City Council approve Concept PUD 2022-04,
subject to the Conditions of Approval.”
SUMMARY
RSI Marine is requesting Conceptual PUD approval for a mixed use Planned Unit Development (PUD)
which would facilitate the construction of four 20,000-square foot boat storage buildings.
BACKGROUND
In August of 1996 the City Council approved a site plan for the construction of an 8,152-square foot
commercial stable and 12,936-square foot commercial kennel along with conditional use permits
allowing multiple buildings on a single lot and permitting the commercial kennel and stable. Variances
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allowing metal siding for the stable and a pylon sign were also approved at this time.
In July of 2005, the property was subdivide to create two separate lots, one for each of the principal
buildings.
In 2020, a portion of the property became right-of-way as part of the Highway 101 realignment and the
western building was removed to make way for a construction staging area.
DISCUSSION
The applicant is requesting that the City approve a Conceptual PUD for the parcels northeast of the
intersection of Highway 101 and Highway 61. The applicant is proposing constructing four 20,000-
square foot buildings on the site to be used for indoor boat storage. They have stated that they envision
this as an interim use until City sewer is available. They have noted the proposed use will utilize high
quality finishes, allow for the present improvement and reasonable use of the site, and, due to the nature
of the use, will generate minimal traffic and other impacts. They are proposing a gate, fence, and video
monitoring to provide on-site security. They believe that once full municipal services are available the
site’s use will shift to include a commercial component.
The property’s current Fringe Business (BF) District zoning would allow for the proposed use as an
interim use; however, the property is guided mixed use, a blend of commercial and high-density
residential development, by the City’s 2040 Land Use Plan, and any City approvals must be consistent
with this classification. In this case, the Comprehensive Plan specifies that the allowable zoning for the
mixed use classification is PUD (Planned Unit Development).
Staff believes that the use of PUD zoning for this development will allow the applicant reasonable use
of the parcel until City sewer becomes available. The proposed use meets a need for the community,
generates minimal traffic, has no outdoor storage component, and can meet the City’s design and
landscaping requirements. The applicant has demonstrated the site can adequately provide parking for a
future retail/office/warehousing mix of uses once sanitary sewer is available. In the longer term, the
uses permitted by the PUD will encourage the property to redevelop as mixed use center once the
proposed building’s reach the end of their lifecycle. For these reasons staff supports the Conceptual
PUD.
A full discussion can be found in the attached staff report.
RECOMMENDATION
Staff recommends that the Planning Commission adopt the following motion:
"The Planning Commission recommends that the City Council approve the Conceptual PUD, subject to
the conditions of approval."
The recommended conditions of approval can be found in the attached staff report.
ATTACHMENTS
Staff Report
PUD Ordinance
Development Review Application
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Proposal to City of Chanhassen
RSI Marine Storage Plan Set
Stormwater Management Narrative and Summary
Engineering Comments
Landscaping and Tree Preservation Memo
Affidavit of Mailing
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CITY OF CHANHASSEN
PC DATE: March 1, 2022
CC DATE: March 21, 2022
REVIEW DEADLINE: March 29, 2022
CASE #: PC 2022-04
BY: MYW
SUMMARY OF REQUEST: RSI Marine is requesting a Conceptual PUD approval for a
mixed use Planned Unit Development (PUD) which would facilitate the construction of four
20,000-square foot boat storage buildings.
LOCATION:10500 and 10520 Great Plains Boulevard
APPLICANT:RSI Marine
Rob Schatzle
1533 West 3rd Avenue
Shakopee, MN 55379
PRESENT ZONING: Fringe Business District (BF)
2040 LAND USE PLAN:Mixed
ACREAGE:8.33 acres DENSITY: NA FLOOR AREA RATIO: .22
LEVEL OF CITY DISCRETION IN DECISION-MAKING:
The City has a relatively high level of discretion in approving Rezonings because the City is
acting in its legislative or policy-making capacity. A rezoning must be consistent with the City’s
Comprehensive Plan.
The City’s discretion in approving or denying a Site Plan is limited to whether or not the
proposed project complies with Zoning Ordinance requirements. If it meets these standards, the
City must then approve the site plan. This is a quasi-judicial decision.
The City’s discretion in approving or denying a Variance is limited to whether or not the
proposed project meets the standards in the Zoning Ordinance for a variance. The City has a
relatively high level of discretion with a variance because the applicant is seeking a deviation
from established standards. This is a quasi-judicial decision.
Notice of this public hearing has been mailed to all property owners within 500 feet.
PROPOSAL/SUMMARY
The applicant is requesting that the City approve a Conceptual PUD for the parcels northeast of
the intersection of Highway 101 and Highway 61. The applicant is proposing constructing four
20,000-square foot buildings on the site to be used for indoor boat storage. They have stated that
PROPOSED MOTION:
“The Chanhassen Planning Commission recommends City Council approve the Concept PUD
2022-04, subject to the conditions of approval.”
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they envision this as an interim use until City sewer is available. They have noted the proposed
use will utilize high quality finishes, allow for the present improvement and reasonable use of the
site, and, due to the nature of the use, will generate minimal traffic and other impacts. They are
proposing a gate, fence, and video monitoring to provide on-site security. They believe that once
full municipal services are available, the site’s use will shift to include a commercial component.
The property’s current Fringe Business (BF) District zoning would allow for the proposed use as
an interim use; however, the property is guided mixed use, a blend of commercial and high-
density residential development, by the City’s 2040 Land Use Plan, and any City approvals must
be consistent with this classification. In this case, the Comprehensive Plan specifies that the
allowable zoning for the mixed use classification is Planned Unit Development (PUD).
Staff believes that the use of PUD zoning for this development will allow the applicant
reasonable use of the parcel until City sewer becomes available. The proposed use meets a need
for the community, generates minimal traffic, has no outdoor storage component, and can meet
the City’s design and landscaping requirements. The applicant has demonstrated the site can
adequately provide parking for a future retail/office/warehousing mix of uses once sanitary sewer
is available. In the longer term, the uses permitted by the PUD will encourage the property to
redevelop as a mixed use center once the proposed building’s reach the end of their lifecycle. For
these reasons, staff supports the conceptual PUD.
APPLICABLE REGULATIONS
Chapter 19, Article IV, Subsurface Sewage Treatment Systems: States septic system
requirements and requires deviations from these standards to go through Chapter 20’s variance
process.
Chapter 19, Article VII, Surface Water Management: States standards required to meet goals and
policies of the City’s surface water management plan.
Chapter 20, Article II, Division 2, Amendments: States process for amending the zoning code.
Chapter 20, Article II, Division 3, Variances: States process and requirements for granting
variances.
Chapter 20, Article II, Division 6, Site Plan Review: States process and requirements for granting
site plan approval.
Chapter 20, Article VI: Wetlands: States wetland buffer and setback requirements.
Chapter 20, Article VIII: Planned Unit Development District: States expectations and requirements
for Planned Unit Developments.
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Chapter 20, Article XXIII, Division 7, Design Standards for Commercial, Industrial and Office-
Institutional Developments: Stipulates design standards for Commercial, Industrial, and Office-
Institutional developments.
Chapter 20, Article XXIV, Off-Street Parking and Loading: States parking lot design and space
requirements.
Chapter 20, Article XXV, Landscaping and Tree Removal: States landscaping and tree
preservation standards for developments.
Chapter 20, Article XXVI, Signs: States requirements for signage.
BACKGROUND
In August of 1996 the City Council approved a site plan for the construction of an 8,152-square
foot commercial stable and 12,936-square foot commercial kennel along with conditional use
permits allowing multiple buildings on a single lot and permitting the commercial kennel and
stable. Variances allowing metal siding for the stable and a pylon sign were also approved at this
time.
In July of 2005, the property was subdivide to create two separate lots, one for each of the
principal buildings.
In 2020, a portion of the property became right-of-way as part of the Highway 101 realignment
and the western building was removed to make way for a construction staging area.
EXISTING CONDITIONS
SITE CONSTRAINTS
The parcels are zoned BF with a combined area of 8.33 acres. The property’s existing BF zoning
requires a minimum lot area of 20,000 square feet with a minimum lot frontage of 100 feet, a
minimum lot death of 150 feet, and maximum lot cover of 40 percent; however, this area is
guided for mixed-use development in the City’s 2040 Land Use Plan which requires that the
zoning be changed to PUD. A commercial kennel/stable formerly operated on the site. A well,
retaining walls, an approximately 7,500-square foot asphalt parking area, an approximately
7,000-square foot gravel driveway, an approximately 8,000-square foot building, and an
approximately 360-square foot shed remain from the previous business.
Bluff Creek Corridor
This property is not located within the Bluff Creek Overlay District.
Wetland Protection
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There is/is not a wetland located on the property; however, there is a small mange type 2 wetland
in the ditch south of the property. As the applicant is proposing to utilize the site’s existing
access to Flying Cloud Drive, the proposed development should not impact this wetland;
however, the wetland buffer strip and setbacks for this wetland must be maintained. These
wetlands have a 20 foot minimum buffer strip, 15 foot accessory structure buffer edge setback,
and 30 foot principal structure buffer edge setbacks.
Bluff Protection
There are no bluffs on the property. The property has numerous steep slopes but none of them
meet the City’s definition of a bluff (i.e. a natural topographic features with an elevation change
of 25 feet or greater and a slope of 30 percent or greater).
The Lower Minnesota River Watershed District (LMRWD) also regulates steep slopes and the
applicant will need to verify with the watershed district if the project triggers their Rule F –
Steep Slopes.
Shoreland Management
The property is not located within a shoreland protection district.
Floodplain Overlay
This property is not within a floodplain. A small section of the ditch south of the property is
within the floodplain; however, no portion of the project will take place below the Base Flood
Elevation (721’ contour).
CONCEPT PUD REVIEW
ANALYSIS
The existing zoning of the property, BF, is not consistent with the land use designation of the
property, Mixed. The Comprehensive Plan allows less intensive land uses to remain in place.
However, any approval by the City for development of the property must be consistent with the
Comprehensive Plan.
SURROUNDING ZONING AND USES
The parcels to the east, west, and southeast of the
subject parcel are also zoned BF. The other nearby
parcels are zoned Agricultural Estate (A2) district.
Nearby uses include nonconforming rental housing, a
golf driving range, a used car dealership, a cold
storage facility, and large lot residential properties.
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With the exception of the single-family residences, all of these uses are legal nonconforming,
conditional uses, or interim uses.
LAND USE - ZONING CONSISTENCY
As noted earlier, the parcels are guided for the Mixed
land use category in the City’s 2040 Land Use Plan.
The City’s Comprehensive Plan states that PUD
zoning is the appropriate zoning for this land use
category.
The use of PUD zoning, as proposed by the applicant,
is consistent with the Comprehensive Plan’s land use
designation for these parcels.
JUSTIFICATION FOR REZONING TO PUD
Planned Unit Developments (PUD) provide for increased flexibility to develop a site by relaxing
most normal zoning district standards, but in exchange for this flexibility they allow the City to
require a higher quality and more sensitive development than would occur under traditional
zoning. The City Code requires that PUDs encourage the following:
1. Preservation of desirable site characteristics and open space and protection of sensitive
environmental features, including steep slopes, mature trees, creeks, wetlands, lakes and
scenic views.
Finding. The applicant’s proposal leaves the area of the steep slopes on the western
portion of the property undisturbed. The use of a PUD helps facilitate the consolidation
of development to the property’s less environmentally sensitive area.
2. More efficient and effective use of land, open space and public facilities through mixing
of land uses and assembly and development of land in larger parcels.
Finding. The use of PUD zoning allows for reasonable use of the property in the short
term while facilitating the long-term development of the parcel as a mixed use center
with a blend of complementary uses. The use of PUD zoning allows for multiple
buildings to be placed on a single lot permitting a more efficient and effective use of land
and allowing for shared parking and other synergies between uses.
3. High quality of design and design compatible with surrounding land uses, including both
existing and planned. Site planning, landscaping and building architecture should reflect
higher quality design than is found elsewhere in the community.
Finding. This area is intended to serve as the City’s southern gateway. For this reason,
the PUD ordinance will require that building elevations facing Highway 61 will exceed
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the City’s minimum design standards. Proposed buildings will be reviewed through the
site plan review process and be required to comply with standard and all other applicable
standards.
4. Sensitive development in transitional areas located between different land uses and along
significant corridors within the city will be encouraged.
Finding.The mix of uses permitted by the PUD will allow for this development to
create sensitive transitions between the mixed uses permitted near the intersection
Highway 101 and Highway 61 and the future high density residential areas to the east of
this site.
5. Development which is consistent with the Comprehensive Plan.
Finding. The use of PUD zoning sets up the framework for the property to develop as a
true mixed-use district including retail, office, storage, and residential uses once sanitary
sewer becomes available to the site, while allowing immediate use of the site as storage
facility. Traditional zoning would not be able to accommodate both the short- and long-
term usage of the site in a manner consistent with the Comprehensive Plan.
6. Parks and open space. The creation of public open space may be required by the City.
Such park and open space shall be consistent with the Comprehensive Park Plan and
overall trail plan.
Finding. The Comprehensive Park Plan does not propose public lands in this area. The
preservation of open space and undisturbed areas on the site is facilitated by the
consolidation of development allowed by the use of PUD zoning, particularly the ability
to place multiple buildings on a single lot.
7. Provision of housing affordable to all income groups if appropriate with the PUD.
Finding.Not applicable as part of this development.
8. Energy conservation through the use of more efficient building designs and sitings and
the clustering of buildings and land uses.
Finding. Energy conservation will be facilitated through the clustering of buildings on a
single lot.
9. Use of traffic management and design techniques to reduce the potential for traffic
conflicts. Improvements to area roads and intersections may be required as appropriate.
Finding. Appropriate traffic management techniques will be used. The developer and
site users will be required to use traffic demand management strategies as appropriate.
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For the above reasons, staff believes the applicant’s request for rezoning to PUD is justified. The
proposed PUD ordinance is provided below:
Flying Cloud Center
(PUD 2022-04)
A. Intent
The purpose of this zone is to create a Mixed-Use Planned Unit Development (PUD)
accommodating a mix of commercial, office, residential, and warehousing uses. The use
of the PUD zone is to allow for a greater variety of uses consistent with the property’s
“Mixed” Land Use guidance and to allow for more flexible design standards in order to
ensure a higher quality and more sensitive development.
B. Uses
The allowed uses in in this zone shall be as listed in this section. If there is a question as
to whether or not a use falls under a stated category, the Community Development
Director shall make that interpretation.
a. The following are Permitted Uses
i. Antennas as regulated by article XXX of the zoning code
ii. Arts, Entertainment, and Recreation
iii. Banks and Financial Institutions
iv. Brew pub, subject to the requirements of section 20-968
v. Brewery operated in conjunction with a taproom producing less than 3,500
barrels per year, subject to the requirements of section 20-969
vi. Clinics
vii. Clothing and Clothing Accessories Stores
viii. Electronics and Appliance Stores
ix. Food and Beverage Stores
x. Gasoline Stations
xi. Health and Personal Care Stores
xii. Microdistillery operated in conjunction with a cocktail room, subject to
the requirements of section 20-967
xiii. Multifamily dwellings
1. Maximum of 46 units
xiv. Offices
xv. Restaurants
xvi. Personal and Laundry Services
xvii. Sporting Goods, Hobby, Musical Instrument, and Book Stores
xviii. Warehousing and Storage
1. Total square footage of all warehouses and storage buildings on
site may not exceed 80,000 square feet
b. The following are Permitted Accessory Uses
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i. Accessory Solar Energy Systems (subject to the requirements of section
20-1093)
ii. Garage as part of a multifamily residential development
iii. Parking Lots
iv. Signs as per allowed in a General Business District
1. Signs must reflect the quality of the development and must be
architecturally compatible with the buildings materials and colors
v. Temporary outdoor sales and events (subject to the requirements of
section 20-964)
C. Lot Requirements and Setbacks
a. Shall be as specified for the General Business District
b. Maximum height is as follows:
i. For the principal structure, three stories/35 feet
ii. For accessory structures, one story/15 feet
D. Design Standards
a. This area is part of the City’s southern gateway and as such it is expected that
building elevations facing Highway 61 will exceed the minimum standards
established by Division 7 and 9 of Article XXIII of the City Code
SITE PLAN REVIEW
The applicant is proposing four 20,000-square foot buildings which will be used for indoor boat
storage. The applicant has stated that the site will have no outdoor storage or exterior trash
receptacles. The applicant has stated that they intend to use tilt up concrete panels and other high
quality finishes on the visible sides of the property.
ARCHITECTURAL COMPLIANCE
Size Portion Placement
The applicant has indicated that the buildings will
be arranged so that the storage bays face the
interior of the development. Due to the proposed
use, the buildings are not anticipated to have a
traditional main entryway, nor is it desirable for
the building’s entrances to face the public streets;
however, the use of recessed entries, awnings, or
other means of articulation is encouraged. If
entries are proposed facing a public street, it is the
City’s expectation that they be articulated in a
manner consistent with the requirements of the
City’s design standards.
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The applicant is proposing using tilt up panels for the visible portions of the development. The
City Code requires that buildings of more than 40 feet in width be divided into increments
between 20 and 40 feet wide through articulation of the façade. The applicant can achieve this
either through façade modulation or potentially through the use of vertical division using
different textures or materials.
Material and Detail
The use of tilt up concrete panels
that are grid or brick like in
appearance would meet the City’s
material and detail requirements.
Smooth panels would not be
permitted for the sections of the
building visible from public roads.
The applicant would be able to use
accent materials such as metal, glass
block, spandrel glass, or similar
materials approved by the City so
long as they make up no more than
15 percent of the building’s façade.
Color
The applicant has not provided a proposed color palette; however colors shall be harmonious.
Building colors shall consist of muted colors with low reflectance. Recommended colors include
browns, grays, tans, beiges and dark or muted green, blues and reds. Bright or brilliant colors and
sharply contrasting colors may be used only for accent purposes occupying a maximum of ten
percent of building facades.
Height and Roof Design
The applicant has indicated the buildings will be one story with a likely height of around 16 feet.
Any mechanical equipment located on the roof will need to be 100 percent screened from public
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view, either through the use of architectural elements such as parapet, landscaping that will be
effective in the winter, or location. The applicant should include pitched elements (roof,
awnings, entries, etc.) to the maximum extent practicable and, if a flat roof is utilized, an
ornamental parapet or cornice should be present to help define the roof.If any roof mounted
mechanical equipment is present, it shall be screened from public view.
Note: The above image illustrates a variety of techniques that can be used to meet the
requirement of the City’s design standards. Staff recognizes that due to the nature of the
proposed use, the fenestration standards will be reduced through the methods discussed in the
following section.
Facade Transparency
While the City typically requires that 50 percent of the first floor elevation viewed by the public
include transparent elements such as windows or doors, with other areas including landscaping
materials and architectural detailing and articulation, the City Code allows for warehouses to
have reduced fenestration standards. This reduction must be offset by the use of spandrel glass or
architectural detailing which provides arches, patterning, recesses and shadowing that provide
aesthetic interest. The applicant will need to demonstrate that the design of the building
elevations visible from public streets meets the requirements of this ordinance.
Site Furnishing
The nature of the applicant’s proposal makes the inclusion of benches, tables, and chairs
impractical.
Fence
The applicant is proposing a fence to help secure the site. The City Code restricts commercial
and industrial fences to a maximum height of eight feet. If the proposed fence does not meet the
definition of an open fence, it must be located outside of the required front yard setbacks and
sight distance triangle. The fence should also be located behind the required landscape buffers.
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Loading Areas, Refuse Area, Etc.
The applicant has stated that no external trash enclosures will be present on the property. All
storage bays will be oriented towards the interior of the development and will be minimally
visible from public streets.
Lot Frontage and Parking Location
The applicant is not proposing locating any parking between the buildings and the primary street.
The applicant has shown approximately 69 parking stalls located between the building’s stalls
and the side street; however, this lot area is provided to show proof of parking for when the site
redevelops to include non-storage uses. The exact amount, location, and configuration of the
site’s parking would be determined at that time based on the mix of uses.
ACCESS
The applicant is proposing using the existing access to Flying Cloud Drive. Access to the site is
currently had from Flying Cloud Drive (CSAH 61) and is located near the western property line.
The preliminary plans indicate that the current access will remain and no additional accesses to
the surrounding Carver County rights-of-way are proposed. The development will be required to
construct a commercial driveway access in accordance with City standards. Any comments or
conditions by Carver County associated with impacts to their rights-of-way must be adhered to
and all permits required must be obtained prior to construction activities commencing.
It appears no turnaround is provided in the preliminary plans. In accordance with Section 20-
1122 of City Code, a turnaround is required when access is had from a state highway, county
road or collector roadway. As access is being had from CSAH 61, a turnaround will be required
that can adequately facilitate the turning movement of the largest anticipated design vehicle for
the site or the City’s largest fire truck, whichever is greater.
EASEMENTS
The applicant is proposing to vacate the existing easements and to dedicate 10-foot drainage and
utility easements along the perimeter of the combined parcel. Additional drainage and utility
easements will be required over public utilities (i.e. water main) extended into the property. The
exact dimensions of the water main drainage and utility easements will be determined by the
location and depth of the water main; however, the minimum is typically a 20-foot wide
easement centered over the main.
GRADING AND DRAINAGE
The existing conditions plan sheet and drainage maps included in the Conceptual PUD submittal
show an existing building near the center of the property with access to Great Plains Boulevard
provide by an asphalt parking area and gravel driveway. Stormwater runoff generally flows from
north to south down the slope of the site where it enters a drainage swale along Flying Cloud
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Drive. The drainage swale conveys stormwater from west to east. Stormwater leaves the site by
way of an existing 48” culvert under Flying Cloud Drive which conveys the stormwater to the
South through Bluff Creek and ultimately outleting to the Minnesota River.
The preliminary plans provided with the Conceptual PUD submittal show a significant amount
of grading. The design steepens the hill on the northeast side of the site to create a flat area
conducive for the four proposed buildings with access and parking. The proposed design uses a
combination of drainage swales and stormwater infrastructure to collect and convey stormwater
into a Best Management Practice (BMP) located on the southwest corner of the property. The
design shows stormwater being conveyed from the proposed BMP to the existing swale along
Flying Cloud Drive through an outlet control structure. Any impacts to Carver County’s right-of-
way must be approved and permitted by the County prior to construction activities. The overall
design of the stormwater infrastructure mimics the flow path of the existing condition and acts to
convey stormwater runoff from impervious surfaces through water quality BMPs. A more
detailed analysis of stormwater volumes and rates may be required to show the wetland onsite is
not negatively impacted by the proposed design.
EROSION CONTROL
The proposed development will exceed one (1) acre of disturbance and will, therefore, be subject
to the General Permit Authorization to Discharge Stormwater Associated with Construction
Activity Under the National Pollution Discharge Elimination/State Disposal System (NPDES
Construction Permit). The applicant has prepared and submitted a preliminary Surface Water
Pollution Prevention Plan (SWPPP) and generally appears feasible. The SWPPP is a required
submittal element for preliminary plat review. No earth disturbing activities may occur until an
approved SWPPP is developed. This SWPPP shall be a standalone document consistent with the
NPDES Construction Permit and shall contain all required elements as listed in Parts III and IV
of the permit. The SWPPP will need to be updated as the plans are finalized, when the
contractor and their sub-contractors are identified and as other conditions change.
RETAINING WALLS
The applicant is proposing several retaining walls. Smooth face concrete, masonry, railroad ties,
and timber may not be used for the construction of the retaining walls. Any walls over four feet
in height will require a building permit and engineered design. Any walls under four feet in
height will require a zoning permit. It should be noted that the height of any retaining wall is
measured from the top of the wall to the bottom of the footing (not to the top of grade adjacent to
the bottom of the wall). Any walls located in a drainage and utility easement will require an
Encroachment Agreement.
Portions of the retaining walls are illustrated to be either close to or directly over the western
property line. Due to the proximity to the property line, the construction of these walls would
require construction activities to occur on the abutting property. The construction of any
improvements that impact or require access to abutting properties must have the appropriate
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right-of-entry agreements and/or temporary construction easements prior to construction
operations commencing.
LANDSCAPING
A Planned Unit Development (PUD)
is expected to ‘protect… mature
trees…” and ‘reflect higher quality
design of…landscaping’. The
proposed development site has
existing trees as evidenced in a field
inspection and shown in current
aerial mapping applications. The
existing trees and woods are not
included on the Existing Conditions
sheets, nor reflected in the submitted
Canopy Coverage calculations shown
on the Landscape Plan. It is
unknown if any of the existing trees
will be preserved, but it appears that
there may be some in part of the ‘undisturbed area’ shown on the plan that may possibly be
unaffected by site grading. The applicant will need to submit a tree inventory for the site as well
as update the canopy coverage calculations. Based on the calculations, the applicant will need to
meet and potentially exceed the minimum requirements for replacement tree planting on the site.
Staff recommends that the applicant consider using a no-mow turf grass or prairie mix in place of
the proposed sod areas to promote a sustainable landscape design for the site.
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A site plan review for the site will be required to show foundation plantings on the outward
facing sides of the buildings. Buffer yard plantings are required along the property lines. The
landscape plan shows the following proposed landscaping for the site.
Required plantings Proposed plantings
Buffer Yard B – North
prop. line, Regional
Trail, 780’
15 Overstory trees
31 Understory trees
46 Shrubs
1 Overstory trees
4 Understory trees
46 Shrubs
Buffer Yard C – South
prop. Line, Hwy 61,
700’
21 Overstory trees
42 Understory trees
63 Shrubs
6 Overstory trees
0 Understory trees
0 Shrubs
Buffer Yard C –west
prop. line, Hwy 101
Great Plains Blvd,
500’
15 Overstory trees
30 Understory trees
45 Shrubs
3 Overstory trees
3 Understory trees
0 Shrubs
Buffer Yard C - East
property line, 460’
10 Overstory trees
20 Understory trees
31 Shrubs
2 Overstory trees
0 Understory trees
0 Shrubs
99
10500 and 10520 Great Plains Boulevard Concept PUD
March 1, 2022
Page 15
The applicant does not meet minimum requirements for buffer yard plantings on the site. The
vehicular-use area is required by Code to have landscaping that includes islands or peninsulas for
every 6,000 square feet of use area and landscape areas and a minimum number of trees in and
around the parking area in order to reduce the overall heat island effect of pavement and improve
aesthetics of the site. Minimum requirements for landscaping for the parking lot include 2,816
square feet of landscaped area around the parking lot, five landscaped islands or peninsulas, and
11 trees for the parking lot. The applicant’s proposed as compared to the requirements for
landscape area and parking lot trees is shown in the following table:
Required Proposed
Vehicular-use landscape
area
2,816 sq. ft.0 sq. ft.
Trees/parking lot 11 trees 0 trees
Landscape islands or
peninsulas/parking lot
5 islands/peninsulas 0 islands/peninsulas
The landscaping as proposed in the concept plan does not meet minimum requirements for trees,
landscaping or islands/peninsulas. Acknowledging that the standard requirements for trees and
landscape islands within the paved area may prove difficult to incorporate into the site, staff
recommends that the applicant propose alternatives that also provide environmental benefits
and/or reduction in the heat island effect caused by large expanses of asphalt.
LIGHTING/SIGNAGE
The applicant has stated that site lighting will be downcast and minimal with virtually no light
leaving the property line. The applicant will need to demonstrate compliance with the City’s
lighting ordinance as part of the site plan review process. The use of motion activated lights to
aide in site security is encouraged.
The development will be subject to the requirements of the City’s Sign Code for the General
Business (BG) District. The proposed PUD ordinance would also require that all signage be
architecturally compatible with buildings’ materials and colors.
MISCELLANEOUS
The buildings will need to have fire sprinkler systems installed and fire panel(s) to facilitate
monitoring the sprinkler systems. Hydrants will be required and the fire access roads/driveway
grades may not exceed 10 percent.
If an HVAC system is required, any and all exterior components will need to be screened from
public view, either through the use of materials similar to the building materials or by using
heaving landscaping that will be effective in winter.
100
10500 and 10520 Great Plains Boulevard Concept PUD
March 1, 2022
Page 16
Carver County property information shows two parcels abutting the preliminary plat’s western
property lines that are listed as “Parcel ID: Gap”. The status of these parcels must be clarified
prior to the recording of the proposed plat.
PARKS
In 2005, a Stipulation of Settlement (Court File No. 10-CV-05-48) between PCH Development,
LLC and the City of Chanhassen was agreed to regarding the Park Dedication fees and Surface
Water Management fees surrounding the subdivision of the “Paws Claws and Hooves Addition”
subdivision (Planning Case #2003-04 and the property of this Conceptual PUD). The park fee
was reduced to $2,800. The settlement agreement states, “If all or any part of the property is
changed to a different principal use or further subdivided, the property shall be subject to
payment of additional Park Dedication and Surface Water Management fees based upon the rates
in effect at that time applicable to the proposed use and type of municipal approval requested.”
However, as the stipulation was between the property owner and the City and was not required to
be memorialized against the property, if the property owner changes from PCH Development,
LLC, no park fees will be required if the PUD is approved. If the property is subdivided in the
future, park fees will be collected at the rate in affect at the time of platting, minus the $2,800.00
already paid.
STORMWATER MANAGEMENT
The project site is located within the Lower Minnesota River Watershed District (LMRWD). The
LMRWD is the LGU that administers NPDES Construction Permits for stormwater
management. The proposed development will exceed the one (1) acre of new impervious area
and will therefore require permanent stormwater BMPs to be constructed as part of this project
and maintained by the owner. The project will be subject to stormwater regulations outlined
under LMRWD Rule D including rate, volume, and water quality.
The City of Chanhassen also regulates the design, construction, and maintenance of stormwater
infrastructure. Article VII, Chapter 19 of City Code describes the required stormwater
management development standards. Section 19-141 states that “these development standards
shall be reflected in plans prepared by developers and/or project proposers in the design and
layout of site plans, subdivisions and water management features.” A stormwater maintenance
agreement and associated operations and maintenance plan is required for all private stormwater
BMPs.
Preliminary plans provided with the Conceptual PUD submittal show stormwater treatment and
rate control from a wet pond with an incorporated filtration bench BMP located on the southwest
corner of the property. The stormwater BMP appears to be properly sized for the impervious
surface proposed in the plans. The design of the BMP is highly dependent on soil types and
infiltration rates of the underlying soils. Soil borings, infiltration testing and an associated
geotechnical report will be needed to confirm the design of the stormwater BMP. No
geotechnical report was included as part of the Conceptual PUD submittal.
101
10500 and 10520 Great Plains Boulevard Concept PUD
March 1, 2022
Page 17
The City’s Water Resources Engineer reviewed the preliminary plans provided with the
Conceptual PUD. Specific comments regarding the design of stormwater infrastructure and
BMPs were provided to the applicant.
In 2005, a Stipulation of Settlement (Court File No. 10-CV-05-48) between PCH Development,
LLC and the City of Chanhassen was agreed to regarding the Park Dedication fees and Surface
Water Management fees surrounding the subdivision of the “Paws Claws and Hooves Addition”
subdivision (PC #2003-04 and the property of this Conceptual PUD). The Surface Water
Management fee was reduced to $9,900.00 and was paid on July 25, 2005. The settlement
agreement states, “If all or any part of the property is changed to a different principal use or
further subdivided, the property shall be subject to payment of additional Park Dedication and
Surface Water Management fees based upon the rates in effect at that time applicable to the
proposed use and type of municipal approval requested.” However, as the stipulation was
between the property owner and the City and was not required to be memorialized against the
property, if the property owner changes from PCH Development, LLC, no stormwater fees will
be required if the PUD is approved. If the property is subdivided in the future, stormwater fees
will be collected at the rate in affect at the time of platting, minus the $9,900.00 already paid.
UTILITIES
Currently, municipal sanitary sewer and potable water services are not available to the site.
During the build-out of the Highway 101 Realignment project, which was substantially
completed in 2021, public sanitary sewer mains and water mains were extended along the
corridor. However, these newly extended utilities are not fully active nor ready for operation to
service properties, as such the site does not have adequate public sanitary sewer and water to
fully serve the development’s needs.
With a lack of adequate City utilities in the area, the development will be required to provide
private utility services (sanitary sewer and potable water) to adequately meet the needs of the
development. The City has preliminarily agreed to allow the development to tap into the public
water main which was extended with the Highway 101 Realignment project, but only to service
the development’s fire suppression needs. At this time there is no sufficient demand along the
extended water main to supply water to the quality standards that the City requires for
consumption. This is important to note because the preliminary plans provided indicate the
existing well on site is proposed to be abandoned. If the site will have any fixtures requiring the
use of water other than for fire suppression needs, a private source of water supply must be used
for those fixtures.
The preliminary plans indicate tapping of the existing public water main for fire suppression
needs at the southwest corner of the property. As shown on the preliminary plans, this would be
infeasible as the water main was housed in a casing at the location, and would be required to be
extended further west to facilitate the connection. Regardless, the development will be required
to extend the public water main to the western property line, and the extension into the site must
be along or near the improved private access to allow for reasonable access for future repair and
102
10500 and 10520 Great Plains Boulevard Concept PUD
March 1, 2022
Page 18
maintenance. Adequate public drainage and utility easements will be required over the public
main as it extends into the site. Private fire laterals can then be tapped from the public main as
necessary.
The property and potential future properties associated with this developable area will be
specially assessed for the extension of the public sanitary sewer when they connect. A rough
estimate of potential fees is provided below; however, it should be noted that the final fee will
depend on the actual project costs:
COMPLIANCE TABLE
Code Project
Building Height 3 stories 1 story
35 feet 16 feet
Building Setback N - 50' E - 10'N - 132' E - 75'
W - 25' S - 25'W - 205' S –50’
Parking Stalls 45 stalls*154 stalls**
(Standards: )
Parking Setback N - 50' E - 10'N - 180' E - 30'
W - 25' S - 25' W - 20' S - 160'
Hard Surface Coverage 70%34%
Lot Area 20,000 sq. ft.0 sq. ft. (0 ac.)
*Unless applicant demonstrates that due to business model less parking is required.
**Shown as conceptual proof of parking for future repurposing of buildings.
103
10500 and 10520 Great Plains Boulevard Concept PUD
March 1, 2022
Page 19
Note: Listed “Code” parking setbacks can be reduced to 10 feet if 100 percent screening is
provided at least five feet above the parking lot. This screening must be in the form of berms and
landscaping.
VARIANCE REVIEW
The applicant is requesting a variance to use a holding tank in lieu of a septic system. Currently,
the site does not have access to the City’s sanitary sewer system and the site’s use does not
require the permanent presence of an employee. Since employees would only be present to drop
off and pick up boats, the site will likely only require a single bathroom. Given low volume of
waste that the site will generate and the fact that the site will be required to hook up to City
sewer once it becomes available, requiring a full-fledged septic system would be excessive and
unnecessary.
RECOMMENDATION
Staff recommends that the Planning Commission adopt the following motion:
The Planning Commission recommends that the City Council approve the Concept PUD, subject
to the conditions of approval:
Planning:
1. The buildings must meet the requirements of Chapter 20, Article XXIII, Division 7
“Design Standards for commercial, industrial, and office-institutional developments. Of
particular importance:
a. The south and west elevations must be articulated either through the use of façade
modulation-stepping back/forward or extending a portion of the façade and/or
vertical division using different textures or materials.
b. The south and west elevations must include architectural detailing to facilitate the
reduction the City’s façade transparency requirement, as outlined in section 20-
1068.
c. Tilt-up concrete panels must be grid or brick like in appearance.
d. Accent materials (metal, glass block, spandrel glass, etc.) are limited to 15 percent
of the building’s façade.
e. Flat roofs should be defined with an ornamental parapet or cornice.
2. A complete site plan application will be required concurrent with the request to rezone to
Planned Unit Development (PUD).
3. A complete variance request for the use of holding tanks will be required concurrent with
the request to rezone to Planned Unit Development (PUD).
4. An expanded narrative should be provided addressing the proposed use of the site.
Narrative should address business model, number of employees present, parking needs,
expected traffic generation and other similar elements.
104
10500 and 10520 Great Plains Boulevard Concept PUD
March 1, 2022
Page 20
5. Proposed fence and gate shall not exceed eight feet in height, shall be located outside of
required front yard setbacks and sight triangle if not of an open design, and shall be
located behind required landscape buffers.
6. A proposed sign plan shall be provided as part of the site plan application.
7. A proposed lighting plan shall be provided as part of the site plan application.
8. Information on the heights and materials shall be provided for the proposed retaining
walls.
Landscaping:
1. Must include existing trees and woods on existing conditions sheet and update the canopy
coverage calculations.
a. Must meet or exceed required replacement tree planting for the site.
2. Must submit a tree inventory for the site.
3. Staff recommends use of no-mow turf grass or prairie mix in place of the proposed sod
areas to promote a sustainable landscape design for the site.
4. Must meet the buffer yard plantings as required by section 20-1176(f).
5. Must include foundation plantings on the outward facing sides of the buildings.
6. Staff recommends that the applicant propose an alternative to the required vehicular use
area landscaping requirements that meets the intent of the ordinance by providing
environmental benefits and/or reducing the heat island effect caused by large expanses of
asphalt.
Engineering:
1. Existing easements must be vacated prior to recording the final plat.
2. Ten-foot public drainage and utility easements will be required along all property lines.
3. Public drainage and utility easements will be required over public utilities with
dimensions adequate to properly repair and maintain the utility (i.e. water main).
4. Status of the two parcels abutting the preliminary plat’s western property lines listed as
“Parcel ID: Gap” must be resolved prior to recording of the final plat.
5. Applicant must coordinate all right-of-way activity with Carver County, including
considerations and conditions associated with easements for the property as well as
requirements associated with ingress/egress and construction activities such as grading
and hauling operations.
6. A turnaround should be included meeting the requirements of Sec. 20-1122. The
turnaround must facilitate the turning movement of the largest anticipated design vehicle
for the site or the City’s largest fire trunk, whichever is greater.
7. Existing Conditions Survey:
a. Topographic data 100 feet beyond the property boundary.
b. Illustration of existing features that would impact the site’s ingress/egress (e.g. the
full extents of Flying Cloud Drive which includes the median near the site’s
entrance).
c. Utilities on or adjacent to the property, including location, size and invert
elevation of storm sewers, catch basins and manholes; location and size of water
mains (including casings) and hydrants; location of gas mains, high pressure lines,
105
10500 and 10520 Great Plains Boulevard Concept PUD
March 1, 2022
Page 21
fire hydrants, electric and telephone lines, and street lights. The direction, distance
to, and size of such facilities shall be indicated.
d. Sewage treatment systems and associated conveyance systems.
e. Existing easements and associated recording document numbers.
f. Property information within 150 feet of the property’s boundary.
g. Retaining wall elevations.
h. Show buffer and wetland setbacks for manage type 2 wetland
8. Retaining walls over 4 feet in height require an engineered design.
9. Retaining walls in easements will require Encroachment Agreements and if any
construction or impacts require access to abutting properties, the appropriate right-of-
entry agreements and/or temporary construction easements must be obtained.
10. No earth disturbing activities may occur until an approved SWPPP is developed. This
SWPPP shall be a standalone document consistent with the NPDES Construction Permit
and shall contain all required elements as listed in Parts III and IV of the permit. The
SWPPP will need to be updated as the plans are finalized, when the contractor and their
sub-contractors are identified and as other conditions change.
11. The City has preliminarily agreed to allow the development to tap into the public water
main which was extended with the Highway 101 Realignment project, but only to service
the development’s fire suppression needs.
12. If the site will have any fixtures requiring the use of water other than for fire suppression
needs, a private source of water supply must be used for those fixtures.
13. Water Connection fees will be due at the time potable water is available to the site and
will be at the rates in effect at that time.
14. The property and potential future properties associated with this developable area will be
specially assessed for the extension of the public sanitary sewer when they connect.
15. The development will be required to extend the public water main to the western property
line, and the extension into the site must be along or near the improved private access to
allow for reasonable access for future repair and maintenance.
Water Resources:
1. Permit from Lower Minnesota River Watershed District (LMRWD) will be required.
Staff believes proposed stormwater will trigger LMRWD Rule D.
2. Verify with LMRWD if the project will trigger Rule F – Steep Slopes.
3. Must address Water Resources Engineer’s (WRE) comments on stormwater design
transmitted via email on February 4, 2022.
a. H&H models should be updated per these comments prior to site plan submittal.
4. Buildings and parking areas must meet required wetland setbacks.
5. Geotechnical report and infiltration testing to show sequencing of BMP design from
infiltration to filtration will likely be required prior to the issuance of building permit.
6. HydroCAD models should be submitted in addition to reports for review by the WRE.
7. Stormwater facilities must meet the requirements of section 19-144 of the City Code.
8. A stormwater maintenance agreement and associated operations and maintenance plan is
required for all private stormwater BMPs.
106
10500 and 10520 Great Plains Boulevard Concept PUD
March 1, 2022
Page 22
9. If the property is subdivided in the future, Stormwater fees will be collected at the rate in
affect at the time of platting, minus the $9,900.00 already paid.
Park:
1. If the property is subdivided in the future, Park fees will be collected at the rate in affect
at the time of platting, minus the $2,800.00 already paid.
Fire:
1. All buildings will require fire sprinkler systems.
2. All buildings will need a fire panel (or one central location panel) to monitor the fire
sprinkler systems.
3. Fire hydrant(s) will be required - currently showing on preliminary utility plan.
4. Fire access roads/driveway grading not to exceed 10% in grade.
ATTACHMENTS
1. Proposed PUD Ordinance
2. Development Review Application
3. RSI Proposal
4. Plan Set
5. Stormwater Narrative
6. Engineering Memo
7. Water Resources Memo
8. Landscaping Memo
9. Public Hearing Notice and Mailing List
g:\plan\2022 planning cases\22-04 10500 and 10520 great plains blvd rez and spa\rsi concept pud staff report.doc
107
Flying Cloud Center
(PUD 2022-04)
A. Intent
The purpose of this zone is to create a Mixed Use PUD accommodating a mix of
commercial, office, residential, and warehousing uses. The use of the PUD zone is to
allow for a greater variety of uses consistent with the property’s “Mixed” Land Use
guidance and to allow for more flexible design standards in order to ensure a higher
quality and more sensitive development.
B. Uses
The allowed uses in in this zone shall be as listed in this section. If there is a question as
to whether or not a use falls under a stated category, the Community Development
Director shall make that interpretation.
a. The following are Permitted Uses
i. Antennas as regulated by article XXX of the zoning code.
ii. Arts, Entertainment, and Recreation
iii. Banks and Financial Institutions
iv. Brew pub, subject to the requirements of section 20-968.
v. Brewery operated in conjunction with a taproom producing less than 3,500
barrels per year, subject to the requirements of section 20-969.
vi. Clinics
vii. Clothing and Clothing Accessories Stores
viii. Electronics and Appliance Stores
ix. Food and Beverage Stores
x. Gasoline Stations
xi. Health and Personal Care Stores
xii. Microdistillery operated in conjunction with a cocktail room, subject to
the requirements of section 20-967.
xiii. Multifamily dwellings
1. Maximum of 46 units
xiv. Offices
xv. Restaurants
xvi. Personal and Laundry Services
xvii. Sporting Goods, Hobby, Musical Instrument, and Book Stores
xviii. Warehousing and Storage
1. Total square footage of all warehouses and storage buildings on
site may not exceed 80,000 sq. ft.
b. The following are Permitted Accessory Uses
i. Accessory Solar Energy Systems (subject to the requirements of section
20-1093).
ii. Garage as part of a multifamily residential development.
iii. Parking Lots
108
iv. Signs as per allowed in a General Business District
1. Signs must reflect the quality of the development and must be
architecturally compatible with the buildings materials and colors.
v. Temporary outdoor sales and events (subject to the requirements of
section 20-964)
C. Lot Requirements and Setbacks
a. Shall be as specified for the General Business District.
b. Maximum height is as follows:
i. For the principal structure, three stories/35 feet.
ii. For accessory structures, one story/15 feet.
D. Design Standards
a. This area is part of the City’s southern gateway and as such it is expected that
building elevations facing Highway 61 will exceed the minimum standards
established by Division 7 and 9 of Article XXIII of the City Code.
109
(C Qca-o-- c'l
COMUUI{ITY DEVELOPUENT DEPARTMENT
Plannlng Dlvlsion - 7700 Markol Boulevard
Malllng Addrcss - P.O. Box 147, Chanhassan, MN 55317
Phono: (952) 227-1 100 I Faxi lg52') 227-1110 CITY OI'CIIAI{IIASSII{
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APPLICATION FOR DEVELOPMENT REVIEW
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Section 1; Application Type (check all that apply)
I
Section 2: Required lnformation
Description of Proposal:
propotty Addrsss or 1_o""11*. NE comer of Flylng Ooud & Greal Plalns Blvd
Parcol #:L6gal Descrlptlon:Lot 1&2 of Paws, Claws & l-loovas Additlon
Total Acr6ag6:8.33 Wstlands PrBsent? E Yes B tto
Present Zor ng:Frlngo Buslness Dlstrlcl (BF)Roqu6sl6d Zonlng:MOil6
Prosont Land Uso Doslgnatlon:€dgggDt R.quosbdLandUeor"dg@
Exlstlng Us6 of Property:Vacant
Ech6ck box lf s€parate nanallve ls attached.IAN 2I 2022
CHANHASSEN PI,AIJNING DEPT
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f_ addresses)
psr documont
Slte Plan Agrosment
110
Section 3: Property Owner and Appllcant lnformation
ArrLiCAii I OTiiErl TiiAN PROPERTY OWNER: ln slgning thls appllcatlon, l, as appllcant, represenl to havo oblalned
authorizatlon from tho properly own€r to flle thls appllcallon. I agroo to bo bound by condilions otapproval, subject only lo
tho rlght to object Etthe hsarings on lhs application or during the appaal perlod. lf ihis appllcatlon his not been signed by
tha proPsr9 ownor, I have attached saparate documenlatlon of full legal capaclty to lile th6 appllcatton. Thls appliiation -
should bo Proe,ossod ln my name and I am the party whom thg Cily should contact regardlng-any matter podainlng to thls
application. I wlll ksop myself ln ormod of tho doadllnes for submlssion of mat€rlal and th6 frogiess of tliis applidtbn. I
funhsr undsrstrand that additlonalfees may be charged for consultlng fses, fsaslblllty studles, etc. wlth an sstimale prlor to
any euthorlzallon to procsed with the study. I certlfy that the lnformatlon and exhlblts submllted are true and conect.
Name:RSI Marina
Address:'1533 West 3rd Ave
clvstatszip: shakopoo, MN 55379 Celli
Fax:Emall:rslb mall.com
Slgnatu16:
6on1""1. Rob SchsEle
Phone: (952) 23&2084
(012)839e990
Date:/-)S -)o 2e-
PROPERTY OUVI,IER: ln signlng lhls appllcatlon, l, as property owner, have full legal capaclly to, and h€reby do,
authorJze tho llling or lhls appllc€tlon. I undsrstand lh€t condltlons ol approval aro blndlrE and agraa to be bound by lhose
condltlons, subject only to the rlght to oblect at ths hsarings ff during lhe appsal psrlods. I wlll keop myself lnform8d of
the deadllnss for submlsslon of materlal and ths progrose of thls appllcation. I furthgr und8rsland that addlllonal fses may
bs clrarged for consulllng foes, faaslblllty studlss, 6tc, w{th an estimats prlor to any authorlzatlon lo proceed wlth the
study. I c€rtfy that the lnformatlon and exhibits submlttsd aro kuo and conscl.
Nams:Nancy Blood lorlContact:
Phone:Addross:P.O. Box 9,{
City/Slate/Zip: Shakopae
Email:zt4
o
e
Signaturs:
Name:
PROJECT ENGINEER (r appflcabls)
James R Hlll, lnc
2999 W. Co Rd 42
City/Stats/Zlp:Bumsvllle, MN 55306
Jgcoopor@rhlnc.comEmail:
6on1r"1. Joel Coopar
Phone: (952) 890{044
Cell:
Fax:
(612) 508-6480
Address:
Thls appllcatlon must be oompleted ln full and must bo accomparled by all information and plans raqtlrad by
applicable City Ordlnance provisions, Befor€ llling lhis applicallon, refar lo th8 approprlate Applicatlon Checklist
and confor wlth thB Plannlng Dsparlmont lo determlne the spsdflc ordlmnco and appllcable procodwal
requkom€nts and fsss.
A dat€rmlnatlon of complstoness of tho appllcatlon shall be made within 1 5 business days of application submlttal. A
writton notco of applicatlon dsficloncies shall bo mallsd to the appllcant withln 15 buslness days ot applicatlon.
Who should rscslve coplss of staff roports?rothor Contact lnformallon:
Nam6:Property OwIrer Vla: E Emall E Maflod Papor Copy
Malled Paper Copy
Malled Paper Copy
Mallsd Papor Copy
Address:
City/Statezlp:
Emall:
INSTRUCTIONS TO APPLICANT: Complela all necossary fonn llelds, then select SAVE FORM to save a copy to tour
dovlco. PRINT FORM and dsllvor to olty along wlth requlrod documents and paymont. SUBMTT FORM to send E dlgltal
copy to th6 dty br processlng.
SAVE FORII!PRINT FORM
Appllcant Ma I Emall IEnglneer Ma: E Emall flohet. Via: E Emall E
cellt ?f z. 2-5o - ? Z//
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-
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Section 4: Nolirication lnfornlalion
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E
SUBillII FORM
111
1533 west 3rd ave Shakopee MN 55379
Site Address: 10520 Great Plains, Chanhassen, MN
January 28, 2022
RSI Marine is a full service boat storage and Marina owner (Carribean Marina Lake Minnetonka).
Storage locations are scattered around the Twin Cities. We are proposing four buildings 20,000 each
with an estimated 80,000 square feet of buildings. We are proposing tilt up panels and other high
quality finishes on all visible sides of the property. These buildings will be used for indoor boat storage
until city sewer service is extended to the property.
There will be no outside storage nor will there be any Residential use in the complex. The site
will have video security, gate and fence. This site will have minimal traffic and noise because of the use.
Site lighting will be downcast and minimal with almost nothing at the property lines. No hazardous
waste material storage is allowed. No exterior storage is allowed on the site. We do not have any trash
receptacles allowed outside.
This use will in our opinion be an exceptional interim use until city sewer is extended. At that point we
feel the “market ” for commercial/retail will be stronger here due to the market forces that will push the
extension of city services. At this point we will work with Commercial Real Estate professionals to
convert these buildings to other uses that align with the Comp Plan and the market. In the interim we
will be able to enhance the property thus making the entire area more desireable.
Upon final development of this project once city services are extended we feel it will be valued at over
$200psf when complete.
We would like to thank you for your consideration of our project.
112
Rob Schatzle
RSI Marine
Rob@rsimarine.com
1533 West 3rd Ave
Shakopee, MN 55379
website www.rsimarine.com
113
SB-1
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SB-1
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BEARINGS ARE BASED ON THE SOUTHEASTLINE OF LOT 2, BLOCK 1, PAWS CLAWS ANDHOOVES ADDITION WHICH IS ASSUMED TOHAVE A BEARING OF S 71°41'29" W.DENOTES FOUND OPEN 1/2 INCH IRON MONUMENTDENOTES SET 1/2 INCH BY 14 INCH IRON MONUMENTWITH CAP MARKED R.L.S. NO. 47481DENOTES FOUND JUDICIAL LANDMARKERDENOTES FOUND RIGHT OF WAY MONUMENTDENOTES CARVER COUNTY MONUMENTDRAINAGE AND UTILITY EASEMENTS BEING10 FEET IN WIDTH, UNLESS OTHERWISEINDICATED, ADJOINING LOT LINES, ANDBEING 10 FEET IN WIDTH, UNLESSOTHERWISE INDICATED, ADJOINING RIGHTOF WAY LINES, AS SHOWN ON THE PLAT.DRAINAGE AND UTILITY EASEMENTSARE SHOWN THUS:VICINITY MAPDRAWN BYDATEREVISIONSPL011CAD FILESS.GZJPROJECT NO.SHEET 1 OF 1PROPERTY DESCRIPTIONRSI MARINE
ST. 0ICHAEL 0INNESOTA
PRELIMINARY PLAT
FORPCH Development, LLC WEST C.R. S8ITE 1 B8RNSVILLE 0N
PHONE . . PKDPSWRQ#MUKLQF.FRP
PLANNERS EN*INEERS S8RVEYORS
ZZZ.MUKLQF.FRP
James R. Hill, Inc.Lot 1, BLock 1, PAWS CLAWS AND HOOVES ADDITION, Carver County, Minnesota,Excepting Parcel 1C and Parcel 1D as shown on CARVER COUNTY RIGHT OF WAY PLATNO. 29, Carver County, Minnesota.andLot 2, BLock 1, PAWS CLAWS AND HOOVES ADDITION, Carver County, Minnesota,Excepting Parcel 1A and Parcel 1B as shown on CARVER COUNTY RIGHT OF WAY PLATNO. 29, Carver County, Minnesota.119
SB-1
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ESTIMATED EROSION AND SEDIMENT CONTROL QUANTITIES
RSI MARINE - CHANHASSEN, MN
TYPE OF PROJECT: COMMERCIAL DEVELOPMENT
TYPE OF WORK: Mass Grading, Utility and Street Construction,
Paving. Subsequently, Joint Trench and Home construction will
occur.
TOTAL PLATTED AREA: 8.33 AC
TOTAL DISTURBED AREA: 6.26 AC
PROPOSED (DESIGN) IMPERVIOUS AREA:2.83 AC
SPECIAL WATERS: The site is NOT within a 1-mile radius of a
special or impaired water.
CONSTRUCTION PHASING
The project is expected to be constructed in three phases, with mass
grading occurring during one construction season. Mass grading is
anticipated to be completed within 4 weeks from commencement of
work. Utility and street construction is anticipated to be completed
within 4 weeks from commencement of work.
POTENTIONAL FOR EROSION AND DISCHARGE OF SEDIMENT
As the site will be stripped of topsoil and vegetation for a period of
several weeks during construction, the potential for erosion will
increase. The overall gradients on the site are relatively low. The
street subcut will serve as temporary sediment basins during
construction. The project is primarily cut, and therefore perimeter
erosion will flow inward towards the project.
The risk of discharge of sediment off of the site is low, due to the
grade orientation and design. The highest potential for discharge off
the site is from the street entrance.
Contractor will be required to manage completion of 3:1 slopes such
that soil exposure is minimized. After excavation and embankments
are completed, slopes shall be re-spread with topsoil, the slope
grades certified, and erosion blanket installed as per the plan.
Contractor shall coordinate these steps to be carried out in a timely
manner.
EROSION CONTROL BMPs
The construction plans anticipate the use of, but are not limited to, the
following Erosion Control BMPs:
1.Perimeter delineation to minimize disturbed areas
2.Temporary Rock Construction Entrance
3.Temporary straw mulch as needed.
4.Seed and mulch/sod
5.Erosion Control Blanket
6.Minimize active or disturbed work areas
7.Horizontal slope grading
8.Turf Reinforcement Mat
SEDIMENT CONTROL BMPs
The construction plans anticipate the use of, but are not limited to, the
following Sediment Control BMPs
1.Sediment traps constructed in street subcut
2.Rock filter dikes in street subcut
3.Utilize permanent stormwater basin as Temporary Sediment
Basin
4.Silt Fence at project perimeter or toe of slopes
5.Inlet protection on existing catch basins
6.Inlet protection on existing culverts
7.Inlet protection after utility construction
8.Linear control along back of new curb and gutter (sod, bioroll, or
silt fence)
9.Routine street sweeping adjacent to construction entrance.
10.Ditch checks
Refer to plans for designated locations of BMPs, details and
implementation notes.
BASIN AND TRAP DEWATERING BMPs
Should the need arise for basin or trap dewatering, contractor shall
utilize a floating skimmer pump intake, such that the water is drawn
from the surface of the basin. Pumped effluent shall not be
discharged into Surface Waters in a turbid state.
Turbid effluent shall be filtered with mechanical devices, chemical
filtering, or a combination thereof, to a state of 50 NTUs or less.
STABILZATION BMPs
The construction plans anticipate the use of, but are not limited
to, the following Stabilization BMPs:
1.After lot pads are grade certified, permanent seed and
mulch can be applied, generally from the front of the
building pad, extending to the rear of the lot (areas where
no further utility construction is anticipated.)
2.After 3:1 slopes on lots are certified, permanent seed and
erosion control blanket can be applied.
3.Rip rap at pipe outfalls
4.Permanent seed and erosion control blanket on basin
slopes after grade certified.
5.After curbs are backfilled, apply permanent seed and
mulch to remaining building pads and boulevard area not
already stabilized.
6.Sod placement, as appropriate.
POLLUTION CONTROL BMPs
1.Fueling: A fixed fueling station is not anticipated.
Contractor will be required to implement BMPs for onsite
re-fueling of equipment.
2.Concrete Washout: A suggested washout area will be
specified on the plan. The developer has the ability to
adjust location or to provide alternative washout
containment.
3.There is not an anticipated need for storing chemicals,
paints, solvents or other potentially toxic or hazardous
materials on site.
SEED & MULCH SPECIFICATIONS
Seed placed for permanent cover or final stabilization requires
6” minimum topsoil cover. Exception: Infiltration basins - see
basin details for soil type). Multiple site visits will be required
to accommodate permanent or temporary stabilization as
required during the phases of construction.
(1) General Seed & Mulch
A.Seed: MNDOT 25-141 at a rate of 59 lb/acre
B.Fertilzer: Type 3 slow release 10-10-10 at a rate of 200
lb/acre
C.Mulch: MNDOT Type 1 at a rate of 2 tons/acre
(2)Temporary Cover Crop (Ponding/Infiltration/Adjacent Slope
Areas)
A.Seed: MNDOT 21-112 at a rate of 100 lb/acre
B.Fertilzer: Type 3 slow release 10-10-10 at a rate of 200
lb/acre
C.Mulch: MNDOT Type 3 at a rate of 2 tons/acre
(3)Hydro-Seeding (Stockpile)
A.Seed: MNDOT 22-111 Seed & Type Hydraulic Mulch at
a rate of 10 lb/1000 gal
B.Fertilzer: Type 3 slow release 10-10-10 at a rate of 50
lb/1000 gal
C.Mulch: Type Hydraulic Mulch at a rate of 350 lb/1000 gal
D.Water: 875 gal/1000 gal
E.Apply at 6000 gal of Slurry per acre
(4) Stormwater Basins (Aquatic Bench up to HWL)
A.Seed: MNDOT 33-261 at a rate of 14.5 lb/acre
B.Fertilzer: Type 3 slow release 10-10-10 at a rate of 200
lb/acre
C.Mulch: MNDOT Type 3 at a rate of 2 tons/acre
INSPECTION AND MAINTENANCE OF BMPs
Routine Inspection
1.Rock Entrance - Inspect weekly. If rock becomes filled
with sediment and tracked material to the extent the
purpose ceases to function, remove the contaminated
rock and replace with new rock.
2.Silt fence - Inspect weekly, particularly for damaged
sections, breaches, down-gradient areas, flow
concentration points, scour areas and sections adjacent to
sensitive areas. Where capacity is filled to more than 50%
of depth, sediment shall be removed to restore capture
capacity.
3.Sediment traps and basins - Inspect weekly. Where
capacity is filled to more than 50% of depth, sediment
shall be removed to restore capture capacity within 72
hours of discovery.
4.Inlet Protection - Inspect weekly or more frequently as
needed after multiple rainfalls less than 0.5”. Verify intake
capacity is not compromised. Where capacity is filled to
more than 50% of depth, sediment shall be removed to
restore capture capacity.
5.Inspect other site specific BMP's on a weekly basis
minimum.
Rain Event Inspection - Mandatory, within 24 hours after a rain
event 0.5” or greater. Complete all items associated with
Routine Inspection. Furthermore, inspect site for breaches,
failures, scours and gullying. Take corrective actions as
necessary to restore functionality to the BMP's. If a given
situation is discovered to be prone to repetitive failure, advise
the Engineer and Contractor for SWPPP and BMP
amendments.
ADDITIONAL SWPPP NOTES
1.All Erosion and Sediment Control facilities shall be
maintained by the contractor during the construction
operations. Any temporary facilities which are to be
removed as called for on these plans and specifications
shall be removed by the contractor at the time directed by
the engineer. The contractor shall then restore the
subsequently disturbed areas in accordance with these
plans and specifications.
2.Wherever practical and feasible, the contractor shall
protect and preserve existing natural trees, grass and
other vegetative cover in effort to provide natural buffering
and filtering of runoff.
3.Contractor shall be adaptable in adjusting construction
schedules in anticipation of weather forecasts of
precipitation, in order to minimize risk of erosion and
sediment transport.
4.It is the responsibility of the contractor to keep public
streets, travel ways, parking lots and trails utilized for
ingress to and egress from the construction site free of
dirt, sediment and debris, resulting from construction
activity. Cost for this shall be considered incidental to the
contract.
5.Adequate control of dust shall be maintained by the
contractor. Cost for dust control shall be considered
incidental to the contract.
ADDITIONAL SWPPP NOTES (continued)
6. Perimeter controls shall not be removed until final
stabilization of areas draining toward the control devices.
7. When temperatures do not exceed 40 degrees F, areas
that require seed and mulch stabilization shall be dormant
seeded. Application rate shall be two times the normal rate.
No dormant seeding shall be done on ice or snow greater
than 2” in depth.
8. Any areas that were seeded that do not achieve 70%
coverage shall be reseeded at the contractor's expense,
where coverage limitation is caused by lack of seed
germination and growth.
MPCA STORMWATER PERMIT - RESPONSIBILITY
The Contractor will be required to become the Permittee for the
project, until final stabilization and transfer of responsibility is
completed. Transfer of responsibility shall be completed with the
Permit Modification Form.
OWNER: ROB SCHATZLE - RSI MARINE - 952-233-2084
PERMITTEE: TBD
OPERATOR(S): TBD
OTHER CONTACTS
ENGINEER:
JOEL G. COOPER, P.E., - James R. Hill, Inc. - 952-890-6044
TRAINING REQUIREMENTS
JOEL G. COOPER, P.E.
DESIGN OF CONSTRUCTION SWPPP
(CERTIFICATION(2020-2023))
UNIVERSITY OF MINNESOTA
INSTRUCTOR: JOHN CHAPMAN
LGU CONTACT: CHARLES HOWLEY - CHANHASSEN -
652-227-1169
MPCA COMPLIANCE: JOSH NORMAN - MPCA -
651-757-2389
The Contractor shall follow the implementation sequence as
described on these plans. Amendments shall be made as site
conditions change. Amendments shall be proposed by
contractor and reviewed by the engineer.
All BMP's selected and implemented shall be appropriate for the
time of year, the current site conditions and for the estimated
duration of use.
These plans shall be considered part of the project SWPPP. A
copy of the SWPPP shall remain on site throughout active
construction.
121
122
1.1 Permit Coverage. [Minn. R. 7090]
1.2 This permit is required for construction activity that results in land disturbance of equal to or greater than
one (1) acre or if a project is part of a common plan of development or sale that ultimately will disturb
greater than one (1) acre, and authorizes, subject to the terms and conditions of this permit, the discharge
of stormwater associated with construction activity. [Minn. R. 7090]
1.3 Construction activity covered by this permit cannot commence until coverage under this permit is effective
as described in item 3.3 through 3.4 or, if applicable, until the Minnesota Pollution Control Agency (MPCA)
has issued an individual National Pollutant Discharge Elimination System (NPDES)/State Disposal System
(SDS) construction stormwater permit for the project. [Minn. R. 7090]
1.4 This permit covers all areas of the State of Minnesota except land wholly within the boundaries of a
federally recognized Indian Reservation owned by a tribe or a tribal member or land held in trust by the
federal government for a tribe or tribal member. [Minn. R. 7090]
1.5 Coverage under this permit is not required when all stormwater from construction activity is routed
directly to and treated by a "treatment works," as defined in Minn. Stat. Sect. 115.01, subd. 21, operated
under an individual NPDES/SDS permit with a Total Suspended Solids (TSS) effluent limit. [Minn. R. 7090]
1.6 This permit covers ongoing projects covered under any previous construction stormwater permit that are
not complete on the issuance date of this permit. Permittees must either remain in compliance with the
previous permit and terminate coverage within 18 months of the issuance date of this permit or comply
with this permit, including updating the Stormwater Pollution Prevention Plan (SWPPP), within the 18-
month period. Permittees of previously permitted projects are not required to incorporate any additional
requirements regarding the permanent stormwater treatment system included in this reissued permit.
[Minn. R. 7090]
1.7 Coverage for projects that extend beyond the expiration date of this permit remains effective for a grace
period covering project completion and Notice of Termination (NOT) submittal. If Permittees cannot
complete projects during the grace period, the MPCA will extend coverage under the next permit and
permittees must comply with the requirements of the new permit including updating the SWPPP.
Permittees are not required to follow changes to the permanent stormwater treatment section of the next
permit. [Minn. R. 7090]
2.1 Prohibitions and Limitations of Coverage. [Minn. R. 7090]
2.2 The owner must develop a complete and accurate SWPPP that complies with item 5.2 prior to submitting
the application for coverage and starting construction activity. Failure to prepare a SWPPP prior to
submitting the application may result in permit revocation. [Minn. R. 7090]
2.3 This permit prohibits discharges of any material other than stormwater treated in compliance with this
permit and discharges from dewatering or basin draining activities in accordance with Section 10.
Prohibited discharges include, but are not limited to, wastewater from washout of concrete, stucco, paint,
form release oils, curing compounds and other construction materials, fuels, oils, or other pollutants used
in vehicle and equipment operation and maintenance, soaps or solvents used in vehicle and equipment
washing and maintenance, and other hazardous substances or wastes. [Minn. R. 7090]
2.4 This permit does not authorize stormwater discharges related to the placement of fill into waters of the
state requiring local, state or federal authorizations (such as U.S. Army Corps of Engineers Section 404
permits, Minnesota Department of Natural Resources (DNR) Public Waters Work permits or local
governmental unit (LGU) Wetland Conservation Act replacement plans or determinations). [Minn. R. 7090]
2.5 This permit does not authorize stormwater discharges associated with industrial activity except for
construction activity. Permittees must obtain coverage for discharges associated with industrial activity
under a separate NPDES/SDS permit once day-to-day operational activities commence even if construction
is ongoing. [Minn. R. 7090]
2.6 This permit does not authorize discharges from non-point source agricultural and silvicultural activities
excluded from NPDES permit requirements under 40 CFR pt. 122.3(e). [Minn. R. 7090]
2.7 This permit does not authorize stormwater discharges to Prohibited, Restricted, Special or Impaired waters
unless permittees follow the additional stormwater requirements in Section 23. [Minn. R. 7090]
2.8 This permit does not replace or satisfy any environmental review requirements including those under the
Minnesota Environmental Policy Act or the National Environmental Policy Act. The owner must verify
completion of any environmental review required by law, including any required Environmental
Assessment Work Sheets or Environmental Impact Statements, Federal environmental review, or other
required review prior to applying for coverage under this permit. If any part of your common plan of
development or sale requires environmental review, coverage under this permit cannot be obtained until
such environmental review is complete. [Minn. R. 7090]
2.9 This permit does not replace or satisfy any review requirements for discharges adversely impacting State
or Federally designated endangered or threatened species or a designated critical habitat. The owner must
comply with the National Historic Preservation Act and conduct all required review and coordination
related to historic preservation, including significant anthropological sites and any burial sites, with the
Minnesota Historic Preservation Officer. [Minn. R. 7090]
2.10 This permit does not authorize discharges to wetlands unless the permittee complies with the
requirements in Section 22. [Minn. R. 7090]
3.1 Application and Coverage Effective Date. [Minn. R. 7090]
3.2 The owner and operator must submit a complete and accurate on-line application with the appropriate fee
to the MPCA for each project that disturbs one (1) or more acres of land or for a common plan of
development or sale that will ultimately disturb one (1) or more acres. [Minn. R. 7090]
3.3 For projects or common plans of development or sale that disturb less than 50 acres or do not discharge
stormwater within 1 mile (aerial radius measurement) of a special or impaired water, permittees do not
need to submit the SWPPP with the application. Permit coverage for these projects is effective upon
application and completing the payment process. [Minn. R. 7090]
3.4 For certain projects or common plans of development or sale disturbing 50 acres or more, the complete
SWPPP must be included with the application and submitted at least 30 days before the start of
construction activity. This applies if there is a discharge point on the project within one mile (aerial radius
measurement) of, and flows to, a special water listed in item 23.3 through 23.6 or an impaired water as
described in item 23.7. Permit coverage for these projects is effective upon submitting the application and
complete SWPPP, completing the payment process and receiving a determination from the MPCA that the
review of the SWPPP is complete. The determination may take longer than 30 days if the SWPPP is
incomplete. If the MPCA fails to contact the permittees within 30 days of application receipt, coverage is
effective 30 days after completing the payment process. [Minn. R. 7090]
3.5 The application requires listing all persons meeting the definition of owner and operator as permittees.
The owner is responsible for compliance with all terms and conditions of this permit. The operator is
responsible for compliance with Sections 3, 4, 6-22, 24 and applicable requirements for construction
activity in Section 23. [Minn. R. 7090]
3.6 Permittees will receive coverage notification in a manner determined by the MPCA. [Minn. R. 7090]
3.7 For construction projects where the owner or operator changes (e.g., an original developer sells portions
of the property to various homebuilders or sells the entire site to a new owner), the current owner and the
new owner or operator must submit a complete permit modification form provided by the MPCA. The
current owner and the new owner or operator must submit the form prior to the new owner or operator
commencing construction activity or no later than 30 days after taking ownership of the property. [Minn.
R. 7090]
3.8 For construction projects where the owner or operator changes, the current owner must provide a SWPPP
to the new owner and operator that specifically addresses the remaining construction activity. The new
owner or operator can implement the original SWPPP, modify the SWPPP, or develop a new SWPPP.
Permittees must ensure their activities do not render another party's erosion prevention and sediment
control BMPs ineffective. [Minn. R. 7090]
4.1 Termination of Coverage. [Minn. R. 7090]
4.2 Permittees must submit a NOT within 30 days after all termination conditions listed in Section 13 are
complete. [Minn. R. 7090]
4.3 Permittees must submit a NOT within 30 days after selling or otherwise legally transferring the entire site,
including permit responsibility for roads (e.g., street sweeping) and stormwater infrastructure final clean
out, or transferring portions of a site to another party. The permittees' coverage under this permit terminates at
midnight on the submission date of the NOT. [Minn. R. 7090]
4.4 Permittees may terminate permit coverage prior to completion of all construction activity if they meet all
of the following conditions:
a. construction activity has ceased for at least 90 days; and
b. at least 90 percent (by area) of all originally proposed construction activity has been completed and
permanent cover has been established on those areas; and
c. on areas where construction activity is not complete, permanent cover has been established; and
d. the site complies with item 13.3 through 13.7.
After permit coverage is terminated under this item, any subsequent development on the remaining
portions of the site will require permit coverage if the subsequent development itself or as part of the
remaining common plan of development or sale will result in land disturbing activities of one (1) or more
acres in size. [Minn. R. 7090]
4.5 Permittees may terminate coverage upon MPCA approval after submitting information documenting the
owner cancelled the project. [Minn. R. 7090]
5.1 Stormwater Pollution Prevention Plan (SWPPP) Content. [Minn. R. 7090]
5.2 The owner must develop a SWPPP. The SWPPP must include items 5.3 through 5.26. [Minn. R. 7090]
5.3 The SWPPP must incorporate specific Best Management Practices (BMP) used to comply with the
requirements of this permit. [Minn. R. 7090]
5.4 The SWPPP must include a narrative describing the timing for installation of all erosion prevention and
sediment control BMPs and a description of the permanent stormwater treatment systems. [Minn. R.
7090]
5.5 The SWPPP must include the location and type of all temporary and permanent erosion prevention and
sediment control BMPs along with procedures used to establish additional temporary BMPs as necessary
for the site conditions during construction. Standard details and/or specifications for BMPs must be
included in the final plans and specifications for the project. [Minn. R. 7090]
5.6 The SWPPP must include the calculations and other information used for the design of temporary
sediment basins and any of the permanent stormwater treatment systems required in Section 15. [Minn.
R. 7090]
5.7 The SWPPP must include estimated quantities anticipated at the start of the project for the life of the
project for all erosion prevention and sediment control BMPs (e.g., linear feet of silt fence or square feet
of erosion control blanket). [Minn. R. 7090]
5.8 The SWPPP must include the number of acres of impervious surface for both pre- and post-construction.
[Minn. R. 7090]
5.9 The SWPPP must include a site map with existing and final grades, including drainage area boundaries,
directions of flow and all discharge points where stormwater is leaving the site or entering a surface water.
The site map must indicate the areas of steep slopes. The site map must also include impervious surfaces,
soil types and locations of potential pollutant-generating activities as identified in Section 12. [Minn. R.
7090]
5.10 The SWPPP must include a map of all surface waters, existing wetlands, and stormwater ponds or basins
that can be identified on maps such as United States Geological Survey 7.5 minute quadrangle maps, the
National Wetland Inventory map or equivalent maps and are within one mile (aerial radius measurement)
from the project boundaries that will receive stormwater from the construction site, during or after
construction. The SWPPP must identify if the surface waters are special or impaired waters. [Minn. R.
7090]
5.11 The SWPPP must include a site map showing construction activity areas that are adjacent to and drain to
Public Waters for which the DNR has promulgated "work in water restrictions" during specified fish
spawning time frames. [Minn. R. 7090]
5.12 Permittees must identify locations of 50' buffer zones as required in item 9.17 and 100' permanent buffer
zones as required in item 23.11, on plan sheets in the SWPPP. [Minn. R. 7090]
5.13 If permittees determine compliance with the following requirements is infeasible, they must document the
determination in the SWPPP:
a. temporary sediment basins as described in Section 14; and
b. for linear projects, if the permanent stormwater treatment system cannot be constructed within the
right-of-way, a reasonable attempt must be made to obtain additional right-of-way (item 15.9); and
c. buffer zones as described in item 9.17 and item 23.11. [Minn. R. 7090]
5.14 If permittees determine that a temporary sediment basin is infeasible as described in item 14.10, the
SWPPP must describe the alternative BMPs used. [Minn. R. 7090]
5.15 Where systems cannot meet the full volume reduction requirement on site, (e.g., the site has infiltration
prohibitions, see item 16.14 through item 16.21) the permittee must document the reasons in the SWPPP.
[Minn. R. 7090]
5.16 The SWPPP must include any stormwater mitigation measures proposed to be part of the final project in
any environmental review document, endangered species review, archeological or other required local,
state or federal review conducted for the project. For purposes of this permit, mitigation measures means
actions necessary to avoid, minimize, or mitigate for impacts related to erosion prevention, sediment
control, the permanent stormwater treatment system, pollution prevention management measures and
discharges associated with the project's construction activity. [Minn. R. 7090]
5.17 The SWPPP must describe the methods used for permanent cover of all exposed soil areas. [Minn. R. 7090]
5.18 Permittees must identify the locations of areas where construction will be phased to minimize the
duration of exposed soil areas in the SWPPP. [Minn. R. 7090]
5.19 For projects with a discharge point on the project within one (1) mile (aerial radius measurement) of and
which flows to an impaired water, permittees must identify the impaired water(s), and any United States
Environmental Protection Agency (USEPA)-approved Total Maximum Daily Load (TMDL) for the
pollutant(s) or stressor(s) described in item 23.7. Permittees' identification must include those TMDLs
approved at any time prior to permit application submittal and are still in effect. [Minn. R. 7090]
5.20 Permittees must document in the SWPPP, all trained individuals identified in item 21.2. Documentation
must include:
a. names of personnel required to be trained; and
b. dates of training and name of instructor(s) and entity providing training; and
c. content of training course.
If permittees do not know the names of the individuals at the time of application, the permittees must
ensure they document training before construction activity commences. [Minn. R. 7090]
5.21 The SWPPP must identify a person knowledgeable and experienced in the application of erosion
prevention and sediment control BMPs who will coordinate with all contractors, subcontractors, and
operators on-site to oversee the implementation of the SWPPP. [Minn. R. 7090]
5.22 The SWPPP must describe any specific chemicals and chemical treatment systems used for enhancing the
sedimentation process and how it achieves compliance with item 9.18. [Minn. R. 7090]
5.23 The SWPPP must identify the person(s), organizations, or entities responsible for long-term operation and
maintenance of permanent stormwater treatment systems. [Minn. R. 7090]
5.24 The SWPPP must describe methods to minimize soil compaction and preserve topsoil. Minimizing soil
compaction is not required where the function of a specific area dictates compaction. [Minn. R. 7090]
5.25 The SWPPP must include any site assessments for groundwater or soil contamination required in item
16.15. [Minn. R. 7090]
5.26 The SWPPP must account for the following factors in designing temporary erosion prevention and
sediment control BMPs:
a. the expected amount, frequency, intensity, and duration of precipitation; and
b. the nature of stormwater runoff and run-on at the site, including factors such as expected flow from
impervious surfaces, slopes, and site drainage features; and
c. the stormwater volume, velocity, and peak flowrates to minimize discharge of pollutants in
stormwater and to minimize channel and streambank erosion and scour in the immediate vicinity of
discharge points;
and
d. the range of soil particle sizes expected to be present. [Minn. R. 7090]
6.1 SWPPP Amendments. [Minn. R. 7090]
6.2 One of the individuals described in item 21.2.a or item 21.2.b or another qualified individual must
complete all SWPPP changes. Changes involving the use of a less stringent BMP must include a justification
describing how the replacement BMP is effective for the site characteristics. [Minn. R. 7090]
6.3 Permittees must amend the SWPPP to include additional or modified BMPs as necessary to correct
problems identified or address situations whenever there is a change in design, construction, operation,
maintenance, weather or seasonal conditions having a significant effect on the discharge of pollutants to
surface waters or groundwater. [Minn. R. 7090]
6.4 Permittees must amend the SWPPP to include additional or modified BMPs as necessary to correct
problems identified or address situations whenever inspections or investigations by the site owner or
operator, USEPA or MPCA officials indicate the SWPPP is not effective in eliminating or significantly
minimizing the discharge of pollutants to surface waters or groundwater or the discharges are causing
water quality standard exceedances (e.g., nuisance conditions as defined in Minn. R. 7050.0210, subp. 2)
or the SWPPP is not consistent with the objectives of a USEPA approved TMDL. [Minn. R. 7050.0210]
7.1 BMP Selection and Installation. [Minn. R. 7090]
7.2 Permittees must select, install, and maintain the BMPs identified in the SWPPP and in this permit in an
appropriate and functional manner and in accordance with relevant manufacturer specifications and
accepted engineering practices. [Minn. R. 7090]
8.1 Erosion Prevention Practices. [Minn. R. 7090]
8.2 Before work begins, permittees must delineate the location of areas not to be disturbed. [Minn. R. 7090]
8.3 Permittees must minimize the need for disturbance of portions of the project with steep slopes. When
steep slopes must be disturbed, permittees must use techniques such as phasing and stabilization
practices designed for steep slopes (e.g., slope draining and terracing). [Minn. R. 7090]
8.4 Permittees must stabilize all exposed soil areas, including stockpiles. Stabilization must be initiated
immediately to limit soil erosion when construction activity has permanently or temporarily ceased on any
portion of the site and will not resume for a period exceeding 14 calendar days. Stabilization must be
completed no later than 14 calendar days after the construction activity has ceased. Stabilization is not
required on constructed base components of roads, parking lots and similar surfaces. Stabilization is not
required on temporary stockpiles without significant silt, clay or organic components (e.g., clean aggregate
stockpiles, demolition concrete stockpiles, sand stockpiles) but permittees must provide sediment controls
at the base of the stockpile. [Minn. R. 7090]
8.5 For Public Waters that the Minnesota DNR has promulgated "work in water restrictions" during specified
fish spawning time frames, permittees must complete stabilization of all exposed soil areas within 200 feet
of the water's edge, and that drain to these waters, within 24 hours during the restriction period. [Minn. R.
7090]
8.6 Permittees must stabilize the normal wetted perimeter of the last 200 linear feet of temporary or
permanent drainage ditches or swales that drain water from the site within 24 hours after connecting to a
surface water or property edge. Permittees must complete stabilization of remaining portions of
temporary or permanent ditches or swales within 14 calendar days after connecting to a surface water or
property edge and construction in that portion of the ditch temporarily or permanently ceases. [Minn. R.
7090]
8.7 Temporary or permanent ditches or swales being used as a sediment containment system during
construction (with properly designed rock-ditch checks, bio rolls, silt dikes, etc.) do not need to be
stabilized. Permittees must stabilize these areas within 24 hours after their use as a sediment containment
system ceases. [Minn. R. 7090]
8.8 Permittees must not use mulch, hydromulch, tackifier, polyacrylamide or similar erosion prevention
practices within any portion of the normal wetted perimeter of a temporary or permanent drainage ditch
or swale section with a continuous slope of greater than 2 percent. [Minn. R. 7090]
8.9 Permittees must provide temporary or permanent energy dissipation at all pipe outlets within 24 hours after
connection to a surface water or permanent stormwater treatment system. [Minn. R. 7090]
8.10 Permittees must not disturb more land (i.e., phasing) than can be effectively inspected and maintained in
accordance with Section 11. [Minn. R. 7090]
9.1 Sediment Control Practices. [Minn. R. 7090]
9.2 Permittees must establish sediment control BMPs on all downgradient perimeters of the site and
downgradient areas of the site that drain to any surface water, including curb and gutter systems.
Permittees must locate sediment control practices upgradient of any buffer zones. Permittees must install
sediment control practices before any upgradient land-disturbing activities begin and must keep the
sediment control practices in place until they establish permanent cover. [Minn. R. 7090]
9.3 If downgradient sediment controls are overloaded, based on frequent failure or excessive maintenance
requirements, permittees must install additional upgradient sediment control practices or redundant
BMPs to eliminate the overloading and amend the SWPPP to identify these additional practices as required
in item 6.3. [Minn. R. 7090]
9.4 Temporary or permanent drainage ditches and sediment basins designed as part of a sediment
containment system (e.g., ditches with rock-check dams) require sediment control practices only as
appropriate for site conditions. [Minn. R. 7090]
9.5 A floating silt curtain placed in the water is not a sediment control BMP to satisfy item 9.2 except when
working on a shoreline or below the waterline. Immediately after the short term construction activity
(e.g., installation of rip rap along the shoreline) in that area is complete, permittees must install an upland
perimeter control practice if exposed soils still drain to a surface water. [Minn. R. 7090]
9.6 Permittees must re-install all sediment control practices adjusted or removed to accommodate short-term
activities such as clearing or grubbing, or passage of vehicles, immediately after the short-term activity is
completed. Permittees must re-install sediment control practices before the next precipitation event even
if the short-term activity is not complete. [Minn. R. 7090]
9.7 Permittees must protect all storm drain inlets using appropriate BMPs during construction until they
establish permanent cover on all areas with potential for discharging to the inlet. [Minn. R. 7090]
9.8 Permittees may remove inlet protection for a particular inlet if a specific safety concern (e.g. street
flooding/freezing) is identified by the permittees or the jurisdictional authority (e.g.,
city/county/township/Minnesota Department of Transportation engineer). Permittees must document the
need for removal in the SWPPP. [Minn. R. 7090]
9.9 Permittees must provide silt fence or other effective sediment controls at the base of stockpiles on the
downgradient perimeter. [Minn. R. 7090]
9.10 Permittees must locate stockpiles outside of natural buffers or surface waters, including stormwater
conveyances such as curb and gutter systems unless there is a bypass in place for the stormwater. [Minn.
R. 7090]
9.11 Permittees must install a vehicle tracking BMP to minimize the track out of sediment from the construction
site or onto paved roads within the site. [Minn. R. 7090]
9.12 Permittees must use street sweeping if vehicle tracking BMPs are not adequate to prevent sediment
tracking onto the street. [Minn. R. 7090]
9.13 Permittees must install temporary sediment basins as required in Section 14. [Minn. R. 7090]
9.14 In any areas of the site where final vegetative stabilization will occur, permittees must restrict vehicle and
equipment use to minimize soil compaction. [Minn. R. 7090]
9.15 Permittees must preserve topsoil on the site, unless infeasible. [Minn. R. 7090]
9.16 Permittees must direct discharges from BMPs to vegetated areas unless infeasible. [Minn. R. 7090]
9.17 Permittees must preserve a 50 foot natural buffer or, if a buffer is infeasible on the site, provide redundant
(double) perimeter sediment controls when a surface water is located within 50 feet of the project's earth
disturbances and stormwater flows to the surface water. Permittees must install perimeter sediment
controls at least 5 feet apart unless limited by lack of available space. Natural buffers are not required
adjacent to road ditches, judicial ditches, county ditches, stormwater conveyance channels, storm drain
inlets, and sediment basins. If preserving the buffer is infeasible, permittees must document the reasons in
the SWPPP. Sheet piling is a redundant perimeter control if installed in a manner that retains all stormwater.
[Minn. R. 7090]
9.18 Permittees must use polymers, flocculants, or other sedimentation treatment chemicals in accordance
with accepted engineering practices, dosing specifications and sediment removal design specifications
provided by the manufacturer or supplier. The permittees must use conventional erosion and sediment
controls prior to chemical addition and must direct treated stormwater to a sediment control system for
filtration or settlement of the floc prior to discharge. [Minn. R. 7090]
10.1 Dewatering and Basin Draining. [Minn. R. 7090]
10.2 Permittees must discharge turbid or sediment-laden waters related to dewatering or basin draining (e.g.,
pumped discharges, trench/ditch cuts for drainage) to a temporary or permanent sediment basin on the
project site unless infeasible. Permittees may dewater to surface waters if they visually check to ensure
adequate treatment has been obtained and nuisance conditions (see Minn. R. 7050.0210, subp. 2) will not
result from the discharge. If permittees cannot discharge the water to a sedimentation basin prior to
entering a surface water, permittees must treat it with appropriate BMPs such that the discharge does not
adversely affect the surface water or downstream properties. [Minn. R. 7050.0210]
10.3 If permittees must discharge water containing oil or grease, they must use an oil-water separator or
suitable filtration device (e.g., cartridge filters, absorbents pads) prior to discharge. [Minn. R. 7090]
10.4 Permittees must discharge all water from dewatering or basin-draining activities in a manner that does not
cause erosion or scour in the immediate vicinity of discharge points or inundation of wetlands in the
immediate vicinity of discharge points that causes significant adverse impact to the wetland. [Minn. R.
7090]
10.5 If permittees use filters with backwash water, they must haul the backwash water away for disposal,
return the backwash water to the beginning of the treatment process, or incorporate the backwash water
into the site in a manner that does not cause erosion. [Minn. R. 7090]
11.1 Inspections and Maintenance. [Minn. R. 7090]
11.2 Permittees must ensure a trained person, as identified in item 21.2.b, will inspect the entire construction
site at least once every seven (7) days during active construction and within 24 hours after a rainfall event
greater than 1/2 inch in 24 hours. [Minn. R. 7090]
11.3 Permittees must inspect and maintain all permanent stormwater treatment BMPs. [Minn. R. 7090]
11.4 Permittees must inspect all erosion prevention and sediment control BMPs and Pollution Prevention
Management Measures to ensure integrity and effectiveness. Permittees must repair, replace or
supplement all nonfunctional BMPs with functional BMPs by the end of the next business day after
discovery unless another time frame is specified in item 11.5 or 11.6. Permittees may take additional time
if field conditions prevent access to the area. [Minn. R. 7090]
11.5 During each inspection, permittees must inspect surface waters, including drainage ditches and
conveyance systems but not curb and gutter systems, for evidence of erosion and sediment deposition.
Permittees must remove all deltas and sediment deposited in surface waters, including drainage ways,
catch basins, and other drainage systems and restabilize the areas where sediment removal results in
exposed soil. Permittees must complete removal and stabilization within seven (7) calendar days of
discovery unless precluded by legal, regulatory, or physical access constraints. Permittees must use all
reasonable efforts to obtain access. If precluded, removal and stabilization must take place within seven
(7) days of obtaining access. Permittees are responsible for contacting all local, regional, state and federal
authorities and receiving any applicable permits, prior to conducting any work in surface waters. [Minn. R.
7090]
11.6 Permittees must inspect construction site vehicle exit locations, streets and curb and gutter systems within
and adjacent to the project for sedimentation from erosion or tracked sediment from vehicles. Permittees
must remove sediment from all paved surfaces within one (1) calendar day of discovery or, if applicable,
within a shorter time to avoid a safety hazard to users of public streets. [Minn. R. 7090]
11.7 Permittees must repair, replace or supplement all perimeter control devices when they become
nonfunctional or the sediment reaches 1/2 of the height of the device. [Minn. R. 7090]
11.8 Permittees must drain temporary and permanent sedimentation basins and remove the sediment when
the depth of sediment collected in the basin reaches 1/2 the storage volume. [Minn. R. 7090]
11.9 Permittees must ensure that at least one individual present on the site (or available to the project site in three (3)
calendar days) is trained in the job duties described in item 21.2.b. [Minn. R. 7090]
11.10 Permittees may adjust the inspection schedule described in item 11.2 as follows:
a. inspections of areas with permanent cover can be reduced to once per month, even if construction
activity continues on other portions of the site; or
b. where sites have permanent cover on all exposed soil and no construction activity is occurring anywhere
on the site, inspections can be reduced to once per month and, after 12 months, may be suspended
completely until construction activity resumes. The MPCA may require inspections to resume if conditions
warrant; or
c. where construction activity has been suspended due to frozen ground conditions, inspections may be
suspended. Inspections must resume within 24 hours of runoff occurring, or upon resuming construction,
whichever comes first. [Minn. R. 7090]
11.11 Permittees must record all inspections and maintenance activities within 24 hours of being conducted and
these records must be retained with the SWPPP. These records must include:
a. date and time of inspections; and
b. name of persons conducting inspections; and
c. accurate findings of inspections, including the specific location where corrective actions are needed; and
d. corrective actions taken (including dates, times, and party completing maintenance activities); and
e. date of all rainfall events greater than 1/2 inches in 24 hours, and the amount of rainfall for each event.
Permittees must obtain rainfall amounts by either a properly maintained rain gauge installed onsite, a
weather station that is within one (1) mile of your location, or a weather reporting system that provides
site specific rainfall data from radar summaries; and
f. if permittees observe a discharge during the inspection, they must record and should photograph and
describe the location of the discharge (i.e., color, odor, settled or suspended solids, oil sheen, and other
obvious indicators of pollutants); and
g. any amendments to the SWPPP proposed as a result of the inspection must be documented as required
in Section 6 within seven (7) calendar days. [Minn. R. 7090]
12.1 Pollution Prevention Management Measures. [Minn. R. 7090]
12.2 Permittees must place building products and landscape materials under cover (e.g., plastic sheeting or
temporary roofs) or protect them by similarly effective means designed to minimize contact with
stormwater. Permittees are not required to cover or protect products which are either not a source of
contamination to stormwater or are designed to be exposed to stormwater. [Minn. R. 7090]
12.3 Permittees must place pesticides, fertilizers and treatment chemicals under cover (e.g., plastic sheeting or
temporary roofs) or protect them by similarly effective means designed to minimize contact with
stormwater. [Minn. R. 7090]
12.4 Permittees must store hazardous materials and toxic waste, (including oil, diesel fuel, gasoline, hydraulic
fluids, paint solvents, petroleum-based products, wood preservatives, additives, curing compounds, and
acids) in sealed containers to prevent spills, leaks or other discharge. Storage and disposal of hazardous
waste materials must be in compliance with Minn. R. ch. 7045 including secondary containment as
applicable. [Minn. R. 7090]
12.5 Permittees must properly store, collect and dispose solid waste in compliance with Minn. R. ch. 7035.
[Minn. R. 7035]
12.6 Permittees must position portable toilets so they are secure and will not tip or be knocked over.
Permittees must properly dispose sanitary waste in accordance with Minn. R. ch. 7041. [Minn. R. 7041]
12.7 Permittees must take reasonable steps to prevent the discharge of spilled or leaked chemicals, including
fuel, from any area where chemicals or fuel will be loaded or unloaded including the use of drip pans or
absorbents unless infeasible. Permittees must ensure adequate supplies are available at all times to clean
up discharged materials and that an appropriate disposal method is available for recovered spilled
materials. Permittees must report and clean up spills immediately as required by Minn. Stat. 115.061,
using dry clean up measures where possible. [Minn. Stat. 115.061]
12.8 Permittees must limit vehicle exterior washing and equipment to a defined area of the site. Permittees
must contain runoff from the washing area in a sediment basin or other similarly effective controls and must
dispose waste from the washing activity properly. Permittees must properly use and store soaps,
detergents, or solvents. [Minn. R. 7090]
12.9 Permittees must provide effective containment for all liquid and solid wastes generated by washout
operations (e.g., concrete, stucco, paint, form release oils, curing compounds and other construction
materials) related to the construction activity. Permittees must prevent liquid and solid washout wastes
from contacting the ground and must design the containment so it does not result in runoff from the
washout operations or areas. Permittees must properly dispose liquid and solid wastes in compliance with
MPCA rules. Permittees must install a sign indicating the location of the washout facility. [Minn. R. 7035,
Minn. R. 7090]
13.1 Permit Termination Conditions. [Minn. R. 7090]
13.2 Permittees must complete all construction activity and must install permanent cover over all areas prior to
submitting the NOT. Vegetative cover must consist of a uniform perennial vegetation with a density of 70
percent of its expected final growth. Vegetation is not required where the function of a specific area
dictates no vegetation, such as impervious surfaces or the base of a sand filter. [Minn. R. 7090]
13.3 Permittees must clean the permanent stormwater treatment system of any accumulated sediment and
must ensure the system meets all applicable requirements in Section 15 through 19 and is operating as
designed. [Minn. R. 7090]
13.4 Permittees must remove all sediment from conveyance systems prior to submitting the NOT. [Minn. R.
7090]
13.5 Permittees must remove all temporary synthetic erosion prevention and sediment control BMPs prior to
submitting the NOT. Permittees may leave BMPs designed to decompose on-site in place. [Minn. R. 7090]
13.6 For residential construction only, permit coverage terminates on individual lots if the structures are
finished and temporary erosion prevention and downgradient perimeter control is complete, the
residence sells to the homeowner, and the permittee distributes the MPCA's "Homeowner Fact Sheet" to
the homeowner. [Minn. R. 7090]
13.7 For construction projects on agricultural land (e.g., pipelines across cropland), permittees must return the
disturbed land to its preconstruction agricultural use prior to submitting the NOT. [Minn. R. 7090]
14.1 Temporary Sediment Basins. [Minn. R. 7090]
14.2 Where ten (10) or more acres of disturbed soil drain to a common location, permittees must provide a
temporary sediment basin to provide treatment of the runoff before it leaves the construction site or
enters surface waters. Permittees may convert a temporary sediment basin to a permanent basin after
construction is complete. The temporary basin is no longer required when permanent cover has reduced
the acreage of disturbed soil to less than ten (10) acres draining to a common location. [Minn. R. 7090]
14.3 The temporary basin must provide live storage for a calculated volume of runoff from a two (2)-year, 24-
hour storm from each acre drained to the basin or 1,800 cubic feet of live storage per acre drained,
whichever is greater. [Minn. R. 7090]
14.4 Where permittees have not calculated the two (2)-year, 24-hour storm runoff amount, the temporary
basin must provide 3,600 cubic feet of live storage per acre of the basins' drainage area. [Minn. R. 7090]
14.5 Permittees must design basin outlets to prevent short-circuiting and the discharge of floating debris.
[Minn. R. 7090]
14.6 Permittees must design the outlet structure to withdraw water from the surface to minimize the discharge
of pollutants. Permittees may temporarily suspend the use of a surface withdrawal mechanism during
frozen conditions. The basin must include a stabilized emergency overflow to prevent failure of pond
integrity. [Minn. R. 7090]
14.7 Permittees must provide energy dissipation for the basin outlet within 24 hours after connection to a
surface water. [Minn. R. 7090]
14.8 Permittees must locate temporary basins outside of surface waters and any buffer zone required in item
23.11. [Minn. R. 7090]
14.9 Permittees must construct the temporary basins prior to disturbing 10 or more acres of soil draining to a
common location. [Minn. R. 7090]
14.10 Where a temporary sediment basin meeting the requirements of item 14.3 through 14.9 is infeasible, permittees
must install effective sediment controls such as smaller sediment basins and/or sediment traps,
silt fences, vegetative buffer strips or any appropriate combination of measures as dictated by individual
site conditions. In determining whether installing a sediment basin is infeasible, permittees must consider
public safety and may consider factors such as site soils, slope, and available area on-site. Permittees must
document this determination of infeasibility in the SWPPP. [Minn. R. 7090]
15.1 Permanent Stormwater Treatment System. [Minn. R. 7090]
15.2 Permittees must design the project so all stormwater discharged from the project during and after
construction activities does not cause a violation of state water quality standards, including nuisance
conditions, erosion in receiving channels or on downslope properties, or a significant adverse impact to
wetlands caused by inundation or decrease of flow. [Minn. R. 7090]
15.3 Permittees must design and construct a permanent stormwater treatment system to treat the water
quality volume if the project's ultimate development replaces vegetation and/or other pervious surfaces
creating a net increase of one (1) or more acres of cumulative impervious surface. [Minn. R. 7090]
15.4 Permittees must calculate the water quality volume as one (1) inch times the net increase of impervious
surfaces created by the project. [Minn. R. 7090]
15.5 Permittees must first consider volume reduction practices on-site (e.g., infiltration or other) when
designing the permanent stormwater treatment system. If this permit prohibits infiltration as described in
item 16.14 through item 16.21, permittees may consider a wet sedimentation basin, filtration basin or
regional pond. This permit does not consider wet sedimentation basins and filtration systems to be volume
reduction practices. [Minn. R. 7090]
15.6 For projects where the full volume reduction requirement cannot be met on-site, (e.g., the site has
infiltration prohibitions), permittees must document the reasons in the SWPPP. [Minn. R. 7090]
15.7 Permittees must discharge the water quality volume to a permanent stormwater treatment system prior
to discharge to a surface water. For purposes of this item, surface waters do not include man-made
drainage systems that convey stormwater to a permanent stormwater treatment system. [Minn. R. 7090]
15.8 Where the proximity to bedrock precludes the installation of any of the permanent stormwater treatment
practices required by Sections 15 through 19, permittees must install other treatment such as grassed
swales, smaller ponds, or grit chambers, prior to the discharge of stormwater to surface waters. [Minn. R.
7090]
15.9 For linear projects where permittees cannot treat the entire water quality volume within the existing rightof-way,
permittees must make a reasonable attempt to obtain additional right-of-way, easement or other
permission for stormwater treatment during the project planning process. Documentation of these
attempts must be in the SWPPP. Permittees must still consider volume reduction practices first as
described in item 15.5. If permittees cannot obtain additional right-of-way, easement or other permission,
they must maximize the treatment of the water quality volume prior to discharge to surface waters.
[Minn. R. 7090]
16.1 Infiltration Systems. [Minn. R. 7090]
16.2 Infiltration options include, but are not limited to: infiltration basins, infiltration trenches, rainwater
gardens, bioretention areas without underdrains, swales with impermeable check dams, and natural
depressions. If permittees utilize an infiltration system to meet the requirements of this permit, they must
incorporate the design parameters in item 16.3 through item 16.21. Permittees must follow the infiltration
prohibition in item 16.14 anytime an infiltration system is designed, including those not required by this
permit. [Minn. R. 7090]
16.3 Permittees must design infiltration systems such that pre-existing hydrologic conditions of wetlands in the
vicinity are not impacted (e.g., inundation or breaching a perched water table supporting a wetland).
[Minn. R. 7090]
16.4 Permittees must not excavate infiltration systems to final grade, or within three (3) feet of final grade, until
the contributing drainage area has been constructed and fully stabilized unless they provide rigorous
erosion prevention and sediment controls (e.g., diversion berms) to keep sediment and runoff completely
away from the infiltration area. [Minn. R. 7090]
16.5 When excavating an infiltration system to within three (3) feet of final grade, permittees must stake off
and mark the area so heavy construction vehicles or equipment do not compact the soil in the infiltration area.
[Minn. R. 7090]
16.6 Permittees must use a pretreatment device such as a vegetated filter strip, forebay, or water quality inlet
(e.g., grit chamber) to remove solids, floating materials, and oil and grease from the runoff, to the
maximum extent practicable, before the system routes stormwater to the infiltration system. [Minn. R.
7090]
16.7 Permittees must design infiltration systems to provide a water quality volume (calculated as an
instantaneous volume) of one (1) inch of runoff, or one (1) inch minus the volume of stormwater treated
by another system on the site, from the net increase of impervious surfaces created by the project. [Minn.
R. 7090]
16.8 Permittees must design the infiltration system to discharge all stormwater (including stormwater in excess
of the water quality volume) routed to the system through the uppermost soil surface or engineered
media surface within 48 hours. Permittees must route additional flows that cannot infiltrate within 48
hours to bypass the system through a stabilized discharge point. [Minn. R. 7090]
16.9 Permittees must provide a means to visually verify the infiltration system is discharging through the soil
surface or filter media surface within 48 hours or less. [Minn. R. 7090]
16.10 Permittees must provide at least one soil boring, test pit or infiltrometer test in the location of the
infiltration practice for determining infiltration rates. [Minn. R. 7090]
16.11 For design purposes, permittees must divide field measured infiltration rates by 2 as a safety factor or
permittees can use soil-boring results with the infiltration rate chart in the Minnesota Stormwater Manual
to determine design infiltration rates. When soil borings indicate type A soils, permittees should perform
field measurements to verify the rate is not above 8.3 inches per hour. This permit prohibits infiltration if
the field measured infiltration rate is above 8.3 inches per hour. [Minn. R. 7090]
16.12 Permittees must employ appropriate on-site testing ensure a minimum of three (3) feet of separation from
the seasonally saturated soils (or from bedrock) and the bottom of the proposed infiltration system.
[Minn. R. 7090]
16.13 Permittees must design a maintenance access, typically eight (8) feet wide, for the infiltration system.
[Minn. R. 7090]
16.14 This permit prohibits permittees from constructing infiltration systems that receive runoff from vehicle
fueling and maintenance areas including construction of infiltration systems not required by this permit.
[Minn. R. 7090]
16.15 This permit prohibits permittees from constructing infiltration systems where infiltrating stormwater may
mobilize high levels of contaminants in soil or groundwater. Permittees must either complete the MPCA's
contamination screening checklist or conduct their own assessment to determine the suitability for
infiltration. Permittees must retain the checklist or assessment with the SWPPP.
For more information and to access the MPCA's "contamination screening checklist" see the Minnesota
Stormwater Manual. [Minn. R. 7090]
16.16 This permit prohibits permittees from constructing infiltration systems in areas where soil infiltration rates
are field measured at more than 8.3 inches per hour unless they amend soils to slow the infiltration rate
below 8.3 inches per hour. [Minn. R. 7090]
16.17 This permit prohibits permittees from constructing infiltration systems in areas with less than three (3)
feet of separation distance from the bottom of the infiltration system to the elevation of the seasonally
saturated soils or the top of bedrock. [Minn. R. 7090]
16.18 This permit prohibits permittees from constructing infiltration systems in areas of predominately
Hydrologic Soil Group type D soils (clay). [Minn. R. 7090]
16.19 This permit prohibits permittees from constructing infiltration systems within a Drinking Water Supply
Management Area (DWSMA) as defined in Minn. R. 4720.5100, subp. 13, if the system will be located:
a. in an Emergency Response Area (ERA) within a DWSMA classified as having high or very high
vulnerability as defined by the Minnesota Department of Health; or
b. in an ERA within a DWSMA classified as moderate vulnerability unless a regulated MS4 Permittee
performed or approved a higher level of engineering review sufficient to provide a functioning
treatment system and to prevent adverse impacts to groundwater; or
c. outside of an ERA within a DWSMA classified as having high or very high vulnerability, unless a
regulated MS4 Permittee performed or approved a higher level of engineering review sufficient
to provide a functioning treatment system and to prevent adverse impacts to groundwater.
See "higher level of engineering review" in the Minnesota Stormwater Manual for more information.
[Minn. R. 7090]
16.20 This permit prohibits permittees from constructing infiltration systems in areas within 1,000 feet
upgradient or 100 feet downgradient of active karst features. [Minn. R. 7090]
16.21 This permit prohibits permittees from constructing infiltration systems in areas that receive runoff from
the following industrial facilities not authorized to infiltrate stormwater under the NPDES stormwater
permit for industrial activities: automobile salvage yards; scrap recycling and waste recycling facilities;
hazardous waste treatment, storage, or disposal facilities; or air transportation facilities that conduct
deicing activities. [Minn. R. 7090]
17.1 Filtration Systems. [Minn. R. 7090]
17.2 Filtration options include, but are not limited to: sand filters with underdrains, biofiltration areas, swales
using underdrains with impermeable check dams and underground sand filters. If permittees utilize a
filtration system to meet the permanent stormwater treatment requirements of this permit, they must
comply with items 17.3 through 17.11. [Minn. R. 7090]
17.3 Permittees must not install filter media until they construct and fully stabilize the contributing drainage
area unless they provide rigorous erosion prevention and sediment controls (e.g., diversion berms) to keep
sediment and runoff completely away from the filtration area. [Minn. R. 7090]
17.4 Permittees must design filtration systems to remove at least 80 percent of TSS. [Minn. R. 7090]
17.5 Permittees must use a pretreatment device such as a vegetated filter strip, small sedimentation basin,
water quality inlet, forebay or hydrodynamic separator to remove settleable solids, floating materials, and
oils and grease from the runoff, to the maximum extent practicable, before runoff enters the filtration
system. [Minn. R. 7090]
17.6 Permittees must design filtration systems to treat a water quality volume (calculated as an instantaneous
volume) of one (1) inch of runoff, or one (1) inch minus the volume of stormwater treated by another
system on the site, from the net increase of impervious surfaces created by the project. [Minn. R. 7090]
17.7 Permittees must design the filtration system to discharge all stormwater (including stormwater in excess
of the water quality volume) routed to the system through the uppermost soil surface or engineered
media surface within 48 hours. Additional flows that the system cannot filter within 48 hours must bypass
the system or discharge through an emergency overflow. [Minn. R. 7090]
17.8 Permittees must design the filtration system to provide a means to visually verify the system is discharging
through the soil surface or filter media within 48 hours. [Minn. R. 7090]
17.9 Permittees must employ appropriate on-site testing to ensure a minimum of three (3) feet of separation
between the seasonally saturated soils (or from bedrock) and the bottom of the proposed filtration
system. [Minn. R. 7090]
17.10 Permittees must ensure that filtration systems with less than three (3) feet of separation between
seasonally saturated soils or from bedrock are constructed with an impermeable liner. [Minn. R. 7090]
17.11 The permittees must design a maintenance access, typically eight (8) feet wide, for the filtration system.
[Minn. R. 7090]
18.1 Wet Sedimentation Basin. [Minn. R. 7090]
18.2 Permittees using a wet sedimentation basin to meet the permanent stormwater treatment requirements
of this permit must incorporate the design parameters in item 18.3 through 18.10. [Minn. R. 7090]
18.3 Permittees must design the basin to have a permanent volume of 1,800 cubic feet of storage below the
outlet pipe for each acre that drains to the basin. The basin's permanent volume must reach a minimum
depth of at least three (3) feet and must have no depth greater than 10 feet. Permittees must configure
the basin to minimize scour or resuspension of solids. [Minn. R. 7090]
18.4 Permittees must design the basin to provide live storage for a water quality volume (calculated as an
instantaneous volume) of one (1) inch of runoff, or one (1) inch minus the volume of stormwater treated
by another system on the site, from the net increase in impervious surfaces created by the project. [Minn.R. 7090]
18.5 Permittees must design basin outlets so the water quality volume discharges at no more than 5.66 cubic
feet per second (cfs) per acre of surface area of the basin. [Minn. R. 7090]
18.6 Permittees must design basin outlets to prevent short-circuiting and the discharge of floating debris. Basin
outlets must have energy dissipation. [Minn. R. 7090]
18.7 Permittees must design the basin to include a stabilized emergency overflow to accommodate storm
events in excess of the basin's hydraulic design. [Minn. R. 7090]
18.8 Permittees must design a maintenance access, typically eight (8) feet wide, for the basin. [Minn. R. 7090]
18.9 Permittees must locate basins outside of surface waters and any buffer zone required in item 23.11.
Permittees must design basins to avoid draining water from wetlands unless the impact to the wetland
complies with the requirements of Section 22. [Minn. R. 7090]
18.10 Permittees must design basins using an impermeable liner if located within active karst terrain. [Minn. R.7090]
19.1 Regional Wet Sedimentation Basins. [Minn. R. 7090]
19.2 When the entire water quality volume cannot be retained onsite, permittees can use or create regional
wet sedimentation basins provided they are constructed basins, not a natural wetland or water body,
(wetlands used as regional basins must be mitigated for, see Section 22). The owner must ensure the
regional basin conforms to all requirements for a wet sedimentation basin as described in items 18.3
through 18.10 and must be large enough to account for the entire area that drains to the regional basin.
Permittees must verify that the regional basin will discharge at no more than 5.66 cfs per acre of surface
area of the basin and must provide a live storage volume of one inch times all the impervious area draining
to the basin. Permittees cannot significantly degrade waterways between the project and the regional
basin. The owner must obtain written authorization from the applicable LGU or private entity that owns
and maintains the regional basin. [Minn. R. 7090]
20.1 SWPPP Availability. [Minn. R. 7090]
20.2 Permittees must keep the SWPPP, including all changes to it, and inspections and maintenance records at
the site during normal working hours by permittees who have operational control of that portion of the
site. [Minn. R. 7090]
21.1 Training Requirements. [Minn. R. 7090]
21.2 Permittees must ensure all of the following individuals receive training and the content and extent of the
training is commensurate with the individual's job duties and responsibilities with regard to activities
covered under this permit:
a. Individuals preparing the SWPPP for the project.
b. Individuals overseeing implementation of, revising and/or amending the SWPPP and individuals
performing inspections for the project. One of these individuals must be available for an onsite
inspection within 72 hours upon request by the MPCA.
c. Individuals performing or supervising the installation, maintenance and repair of BMPs. [Minn. R. 7090]
21.3 Permittees must ensure individuals identified in Section 21 receive training from local, state, federal
agencies, professional organizations, or other entities with expertise in erosion prevention, sediment
control, permanent stormwater treatment and the Minnesota NPDES/SDS Construction Stormwater
permit. Permittees must ensure these individuals attend a refresher-training course every three (3) years.[Minn. R. 7090]
22.1 Requirements for Discharges to Wetlands. [Minn. R. 7050.0186]
22.2 If the project has any discharges with the potential for significant adverse impacts to a wetland, (e.g.,
conversion of a natural wetland to a stormwater pond) permittees must demonstrate that the wetland
mitigative sequence has been followed in accordance with items 22.3 or 22.4. [Minn. R. 7050.0186]
22.3 If the potential adverse impacts to a wetland on a specific project site are addressed by permits or other
approvals from an official statewide program (U.S. Army Corps of Engineers 404 program, Minnesota Department of
Natural Resources, or the State of Minnesota Wetland Conservation Act) that are issued
specifically for the project and project site, permittees may use the permit or other determination issued
by these agencies to show the potential adverse impacts are addressed. For purposes of this permit,
deminimus actions are determinations by the permitting agency that address the project impacts, whereas
a non-jurisdictional determination does not address project impacts. [Minn. R. 7090]
22.4 If there are impacts from the project not addressed in one of the permits or other determinations
discussed in item 22.3 (e.g., permanent inundation or flooding of the wetland, significant degradation of
water quality, excavation, filling, draining), permittees must minimize all adverse impacts to wetlands by
utilizing appropriate measures. Permittees must use measures based on the nature of the wetland, its
vegetative community types and the established hydrology. These measures include in order of
preference:
a. avoid all significant adverse impacts to wetlands from the project and post-project discharge;
b. minimize any unavoidable impacts from the project and post-project discharge;
c. provide compensatory mitigation when the permittees determine(s) that there is no reasonable and
practicable alternative to having a significant adverse impact on a wetland. For compensatory mitigation,
wetland restoration or creation must be of the same type, size and whenever reasonable and practicable
in the same watershed as the impacted wetland. [Minn. R. 7050.0186]
23.1 Additional Requirements for Discharges to Special (Prohibited, Restricted, Other) and Impaired Waters. [Minn. R. 7090]
23.2 The BMPs identified for each special or impaired water are required for those areas of the project draining
to a discharge point on the project that is within one mile (aerial radius measurement) of special or
impaired water and flows to that special or impaired water. [Minn. R. 7090]
23.3 Discharges to the following special waters identified as Prohibited in Minn. R. 7050.0035 Subp. 3 must
incorporate the BMPs outlined in items 23.9, 23.10, 23.11, 23.13 and 23.14:
a. Boundary Waters Canoe Area Wilderness; Voyageurs National Park; Kettle River from the site of the
former dam at Sandstone to its confluence with the Saint Croix River; Rum River from Ogechie Lake
spillway to the northernmost confluence with Lake Onamia.
b. Those portions of Lake Superior North of latitude 47 degrees, 57 minutes, 13 seconds, East of Hat Point,
South of the Minnesota-Ontario boundary, and West of the Minnesota-Michigan boundary;
c. Scientific and Natural Areas identified as in Minn. R. 7050.0335 Subp. 3: Boot Lake, Anoka County; Kettle
River in sections 15, 22, 23, T 41 N, R 20, Pine County; Pennington Bog, Beltrami County; Purvis Lake-Ober
Foundation, Saint Louis County; waters within the borders of Itasca Wilderness Sanctuary, Clearwater
County; Wolsfeld Woods, Hennepin County; Green Water Lake, Becker County; Blackdog Preserve, Dakota
County; Prairie Bush Clover, Jackson County; Black Lake Bog, Pine County; Pembina Trail Preserve, Polk
County; and Falls Creek, Washington County. [Minn. R. 7050.0335, Subp. 3]
23.4 Discharges to the following special waters identified as Restricted must incorporate the BMPs outlined in
items 23.9, 23.10 and 23.11:
a. Lake Superior, except those portions identified as prohibited in item 23.3.b;
b. Mississippi River in those portions from Lake Itasca to the southerly boundary of Morrison County that
are included in the Mississippi Headwaters Board comprehensive plan dated February 12, 1981;
c. Scenic or Recreational River Segments: Saint Croix River, entire length; Cannon River from northern city
limits of Faribault to its confluence with the Mississippi River; North Fork of the Crow River from Lake
Koronis outlet to the Meeker-Wright county line; Kettle River from north Pine County line to the site of the
former dam at Sandstone; Minnesota River from Lac que Parle dam to Redwood County State Aid Highway
11; Mississippi River from County State Aid Highway 7 bridge in Saint Cloud to northwestern city limits of
Anoka; and Rum River from State Highway 27 bridge in Onamia to Madison and Rice streets in Anoka;
d. Lake Trout Lakes identified in Minn. R. 7050.0335 including lake trout lakes inside the boundaries of the
Boundary Waters Canoe Area Wilderness and Voyageurs National Park;
e. Calcareous Fens listed in Minn. R. 7050.0335, Subp. 1. [Minn. R. 7050.0335, Subp. 1]
23.5 Discharges to the Trout Lakes (other special water) identified in Minn. R. 6264.0050, subp. 2 must
incorporate the BMPs outlined in items 23.9, 23.10 and 23.11. [Minn. R. 6264.0050, Subp. 2]
23.6 Discharges to the Trout Streams (other special water) listed in Minn. R. 6264.0050, subp. 4 must
incorporate the BMPs outlined in items 23.9, 23.10, 23.11 and 23.12. [Minn. R. 6264.0050, Subp. 4]
23.7 Discharges to impaired waters or a water with an USEPA approved TMDL for any of the impairments listed
in this item must incorporate the BMPs outlined in items 23.9 and 23.10. Impaired waters are waters
identified as impaired under section 303 (d) of the federal Clean Water Act for phosphorus (nutrient
eutrophication biological indicators), turbidity, TSS, dissolved oxygen or aquatic biota (fish bioassessment,
aquatic plant bioassessment and aquatic macroinvertebrate bioassessment). Terms used for the pollutants
or stressors in this item are subject to change. The MPCA will list terminology changes on its construction
stormwater website. [Minn. R. 7090]
23.8 Where the additional BMPs in this Section conflict with requirements elsewhere in this permit, items 23.9
through 23.14 take precedence. [Minn. R. 7090]
23.9 Permittees must immediately initiate stabilization of exposed soil areas, as described in item 8.4, and
complete the stabilization within seven (7) calendar days after the construction activity in that portion of
the site temporarily or permanently ceases. [Minn. R. 7090]
23.10 Permittees must provide a temporary sediment basin as described in Section 14 for common drainage
locations that serve an area with five (5) or more acres disturbed at one time. [Minn. R. 7090]
23.11 Permittees must include an undisturbed buffer zone of not less than 100 linear feet from a special water
(not including tributaries) and must maintain this buffer zone at all times, both during construction and as
a permanent feature post construction, except where a water crossing or other encroachment is necessary
to complete the project. Permittees must fully document the circumstance and reasons the buffer
encroachment is necessary in the SWPPP and include restoration activities. This permit allows replacement
of existing impervious surface within the buffer. Permittees must minimize all potential water quality,
scenic and other environmental impacts of these exceptions by the use of additional or redundant
(double) BMPs and must document this in the SWPPP for the project. [Minn. R. 7090]
23.12 Permittees must design the permanent stormwater treatment system so the discharge from the project
minimizes any increase in the temperature of trout streams resulting from the one (1) and two (2) year 24-
hour precipitation events. This includes all tributaries of designated trout streams located within the same
Public Land Survey System (PLSS) Section. Permittees must incorporate one or more of the following
measures, in order of preference:
a. Provide stormwater infiltration or other volume reduction practices as described in item 15.4 and 15.5,
to reduce runoff. Infiltration systems must discharge all stormwater routed to the system within 24 hours.
b. Provide stormwater filtration as described in Section 17. Filtration systems must discharge all
stormwater routed to the system within 24 hours.
c. Minimize the discharge from connected impervious surfaces by discharging to vegetated areas, or grass
swales, and through the use of other non-structural controls.
d. If ponding is used, the design must include an appropriate combination of measures such as shading,
vegetated swale discharges or constructed wetland treatment cells that limit temperature increases. The
pond must be designed as a dry pond and should draw down in 24 hours or less.
e. Other methods that minimize any increase in the temperature of the trout stream. [Minn. R. 7090]
23.13 Permittees must conduct routine site inspections once every three (3) days as described in item 11.2 for
projects that discharge to prohibited waters. [Minn. R. 7090]
23.14 If discharges to prohibited waters cannot provide volume reduction equal to one (1) inch times the net
increase of impervious surfaces as required in item 15.4 and 15.5, permittees must develop a permanent
stormwater treatment system design that will result in no net increase of TSS or phosphorus to the
prohibited water. Permittees must keep the plan in the SWPPP for the project. [Minn. R. 7090]
24.1 General Provisions. [Minn. R. 7090]
24.2 If the MPCA determines that an individual permit would more appropriately regulate the construction
activity, the MPCA may require an individual permit to continue the construction activity. Coverage under
this general permit will remain in effect until the MPCA issues an individual permit. [Minn. R. 7001.0210,Subp. 6]
24.3 If the permittee cannot meet the terms and conditions of this general permit, an owner may request an
individual permit, in accordance with Minn. R. 7001.0210 subp. 6. [Minn. R. 7001.0210, Subp. 6]
24.4 Any interested person may petition the MPCA to require an individual NPDES/SDS permit in accordance
with 40 CFR 122.28(b)(3). [40 CFR 122.29(b)(3)]
24.5 Permittees must make the SWPPP, including all inspection reports, maintenance records, training records
and other information required by this permit, available to federal, state, and local officials within three (3)
days upon request for the duration of the permit and for three (3) years following the NOT. [Minn. R.7090]
24.6 Permittees may not assign or transfer this permit except when the transfer occurs in accordance with the
applicable requirements of item 3.7 and 3.8. [Minn. R. 7090]
24.7 Nothing in this permit must be construed to relieve the permittees from civil or criminal penalties for
noncompliance with the terms and conditions provided herein. Nothing in this permit must be construed
to preclude the initiation of any legal action or relieve the permittees from any responsibilities, liabilities,
or penalties to which the permittees is/are or may be subject to under Section 311 of the Clean Water Act
and Minn. Stat. Sect. 115 and 116, as amended. Permittees are not liable for permit requirements for
activities occurring on those portions of a site where the permit has been transferred to another party as
required in item 3.7 or the permittees have submitted the NOT as required in Section 4. [Minn. R. 7090]
24.8 The provisions of this permit are severable. If any provision of this permit or the application of any
provision of this permit to any circumstances is held invalid, the application of such provision to other
circumstances, and the remainder of this permit must not be affected thereby. [Minn. R. 7090]
24.9 The permittees must comply with the provisions of Minn. R. 7001.0150, subp. 3 and Minn. R. 7001.1090,
subp. 1(A), 1(B), 1(C), 1(H), 1(I), 1(J), 1(K), and 1(L). [Minn. R. 7090]
24.10 The permittees must allow access as provided in 40 CFR 122.41(i) and Minn. Stat. Sect. 115.04. The
permittees must allow representatives of the MPCA or any member, employee or agent thereof, when
authorized by it, upon presentation of credentials, to enter upon any property, public or private, for the
purpose of obtaining information or examination of records or conducting surveys or investigations. [40
CFR 122.41(i)]
24.11 For the purposes of Minn. R. 7090 and other documents that reference specific sections of this permit,
"Stormwater Discharge Design Requirements" corresponds to Sections 5, 6 and 14 through 21;
"Construction Activity Requirements" corresponds to Sections 7 through 13; and "Appendix A"
corresponds to Sections 22 and 23. [Minn. R. 7090]
123
124
SB-1
125
126
127
RSI MARINE
Chanhassen, MN
For
RSI MARINE
STORMWATER MANAGEMENT NARRATIVE & SUMMARY
lanuary 27 , 2022
I hereby certify that this plan and report were prepared by me or under my direct supervision
and that I am a duly Licensed Professional Engineer under the laws of the State of Minnesota.
Joel G. Cooper P.E.
License No. 18495 CITY OF CHANHASSEII
RECEIVED
JAN 2 8 2O2Z
CMNHASSEN PI.AI{IIIIIG DEPI
128
The RSI site is located at the northeast corner of Flying Cloud Drive and Great Plains Blvd. The
existing site was previously constructed with a building and parking lot for an animal daycare and
overnight facility.
The site has both hydrologic soil groups B and C on-site. The predominate soil group for the site
is hydrologic group C. The site drains from north to south and drains to the Flying Cloud Drive ditch
along the north side of the road and eventually drains to across the road and to Rice Lake. The site
ranges in elevation from 798 on the north side to 726 on the south side.
The site is being proposed to be developed into four (4) buildings of 20,000 square feet each
wlth an access off of Flying Cloud Drive in the southeast corner of the property. The proposed
development will collect storm water from the building and drive and direct the stormwater into a
stormwater pond in the southwest corner of the property through an on-site storm sewer system. The
proposed site has been modeled using HydroCAD with Atlas 14 stormwater events for the 1,2,10 and
100-year events. The proposed and existing stormwater run-off rates for the site are as follows:
EXISTING PROPOSED
1 YEAR 5.99 c.f.s.5.71 c.f.s
Z YEAR 8.37 c.f.s 6.94 c.f.s
1O YEAR 23.65 c.f.s.10.23 c.f.s
1OO YEAR 45.21 c.f.s.18.76 c.f.s
The Infiltration for the site wlll be provided with a filtration pond adjacent to the stormwater
pond. The proposed site will have 2.79 acj,es ot 72!,532 square feet of impervlous surface. The
impervious surface is required to infiltrate the first one inch of stormwater runoff. The proposed
infiltration required is 121,532 sq ft x 1 inch/12inch or 10,128 cubic feet. The infiltration volume
provided is 10,220 cubic feet.
The proposed stormwater plan meets the city stormwater requirements. We have attached the
HydrocAD model for your review. lf you have any questions, please call.
Sincerely,
James R Hlll, lnc
Joel G. Cooper P.E
President
EXISTING CONDITIONS
The property is currently sitting empty and not being utilized. The vegetation is a combination of
grass and trees.
PROPOSED CONDITIONS
YEAR
129
Routing Diagram for RSI Marine site Chanhassen,Mn 23953
Prepared by (enter your company name herc]., Ptirled 1127D022
HydroCAD@ 10.00-25 dn 00744 O 2019 HydroCAD Software Solutions LLC
(new Subcat)
130
RSI Marine site Chanhassen,Mn 23953
Prepared by {enter your company name here}Ptinled 112712022
Peoe 2HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC
Area Listing (all nodes)
Area
(acres)
CN Description
(subcatchm ent-numbers)
7.860
0.4'10
8.270
74
98
75
>750lo Grass cover, Good, HSG C (1S)
Paved parking, HSG C (1S)
TOTAL AREA
131
RSI Marine site Chanhassen,Mn 23953
Prepared by {enter your company name here}Prinled 112712022
Paoe 3HydroCAD@ 10.00-25 s/n 00744 @ 201 o HvdroCAD Software Solutions LLc
Soil Listing (all nodes)
Area
(acres)Group
Soil Subcatchment
Numbers
0.000
0.000
8.270
0 000
0.000
8.270
HSG A
HSG B
HSG C
HSG D
Other
1S
TOTAL AREA
132
HSG.A
(acres)
HSG-B
(acres)
HSG-C
(acres)
HSG-D Other Total
(acres) (acres) (acres)
Ground
Cover
Subcatchment
Numbers
0.000
0.000
0.000
0.000
0.000
0.000
7.860
0.410
8.270
0.000
0.000
0.000
0.000
0.000
0.000
7.860
0.410
8.270
>75% Grass cover, Good 1S
Paved parking 15
TOTAL AREA
RSI Marine site Chanhassen,Mn 23953
Prepared by {enter your company name here} Ptinled 112712022
HvdroCAD@ 10.00-25 s/n 00744 O 2019 HvdroCAD Software Solutions LLC Paqe 4
Ground Covers (all nodes)
133
RSI Marine site Chanhassen,Mn 23953
Prepared by {enter your company name here}
MSE 24-hr 3 1 year Rainfall=2.50"
Prinled 112712022
Paoe 5HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC
Time span=0.00-72.00 hrs, dt=0.0'l hrs, 7201 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Dyn-Stor-lnd method - Pond routing by Dyn-Stor-lnd method
Subcatchment 1S: (new Subcat)Runotf Area=8.270 ac 4.96% lmpervious Runoff Depth=0.65"
Flow Length=690' Tc='l6.9 min CN=75 Runoff=s.gg cfs 0.448 af
Total Runoff Area = 8.270 ac Runoff Volume = 0.448 af Average Runoff Depth = 0.65"
95.04% Pervious = 7.860 ac 4.96% lmpervious = 0.4'10 ac
134
RSI Marine site Chanhassen,Mn 23953
Prepared by {enter your company name here}
MSE 24-hr 3 1 year Rainfall=2.50"
Ptinted 112712022
Paoe 6HvdroCAD@ 10.00-25 sln 00744 O2019 HydroCAD Software Solutions LLC
Summary for Subcatchment 1S: (new Subcat)
Runoff = 5.99 cls @ 12.28 hrs, Volume= 0.448 af, Depth= 0.65"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
MSE 24-hr 3 1 year Rainfall=2.50"
Area (ac)CN Description
74
98
>75% Grass cover, Good, HSG C
Paved oarkino. HSG C
8.270
7.860
0.410
75 Weighted Average
95.04% Pervious Area
4.96% lmpervious Area
Tc Length(min) (feeo
Slope Velocity Capacity Description
(fUft) (fusec) (cfs)
13.3
2.7
0.9
0.2000
0.0138
0.1080
0.34
1.76
2.30
Sheet Flow,
Grass: Dense n= 0.24O P2= 2.87"
Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
16.9 690 Total
Subcatchment 1S: (new Subcat)
Hydrograph
! Runoff
'-9
6
5
3
2
Runoff Volume=0148 af
MSE 24-hr 3
Are
52 01aRnfallyear
a I 72 a0 cuRnoff
Flow Length=690'
Runoff Depth=0.65"
0 2 4 6 810 1214 16 1A202224262830 32 34 36 38 40 42 44 46 4a 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)
7.860
0.410
270
290
130
Ill
I
I
l-*
il
li
-
--1 i i;
CN=75
Tc=16.9 min
135
RSI Marine site Chanhassen,Mn 23953 MSE 24-hr 3 2 year Rainfall=2.87"
Prepared by {enter your company name here} Prinled 112712022
HydroCAD@ 1 0.00-25 s/n 00744 A 2Ug HydroCAD Software Solutions LLC Paae 7
Time span=0.00-72.00 hrs, dt=0.01 hrs, 720'1 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Dyn-Stor-lnd method - Pond routing by Dyn-Stor-lnd method
Subcatchment 1S: (new Subcat)Runoff Area=8.270 ac 4.96% lmpervious Runotf Depth=o.88"
Flow Length=690' Tc=16.9 min CN=75 Runoff=8.37 cfs 0.604 af
Total Runoff Area = 8.270 ac Runoff Volume = 0.604 af Average Runoff Depth = 0.88"
95.04% Pervious = 7.860 ac 4.96% lmpervious = 0.410 ac
136
RSI Marine site Chanhassen,Mn 23953
Prepared by {enter your company name here}
MSE 24-hr 3 2 year Rainfall=2.87"
Prinled 112712022
Paoe 8HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC
Summary for Subcatchment 1S: (new Subcat)
Runoff = 8.37 ds @ 12.27 hrs, Volume= 0.604 af, Depth= 0.88"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.0G72.00 hrs, dt= 0.01 hrs
MSE 24-hr 3 2 year Rainfall=2.87"
Area (ac) CN Description
7.860
0.410
74
98
>75% Grass cover, Good, HSG C
Paved parkinq, HSG C
8.270
7.860
0.410
75 Weighted Average
95.04% Pervious Area
4.96% lmpervious Area
Tc
(min)
Length
(feet)
Slope Velocity Capacity Description
(fvft)(fusec) (cfs)
13.3
2.7
0.9
270
290
130
0.34
1.76
2.30
Sheet Flow,
Grass: Dense n= 0.240 P2= 2.87"
Shallow Concentrated Flow,
Grassed Watenivay Kv= 15.0 fps
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
16.9 690 Total
Subcatchment 1S: (new Subcat)
Hydrograph
;
I
I
7
6
5
4
3
2
MSE 24-hr 3
2 year Rainfall=2.87"
Runoff Area=8.270 ac
Runoff Volume=0.604 af
Runoff Depth=0.88"
Flow Length=690'
Tc=16.9 min
CN=75
0 0 2 4 6 610 12 14 16 $ 20 22 21 26 2A 30 32 31 36 38 40 42 ,t4 46 48 50 52 54 56 58 60 62 M 66 68 70 72
Tlmo (houB)
0.2000
0.0138
0.1080
l.E;;rt
1
137
RSI Marine site Chanhassen,Mn 23953
Prepared by {enter your company name here}
lilSE 24-hr 3 10 year Rainfall=4.87"
Ptinted 112712022
Peoe IHvdroCAD@ 10.00-25 s/n 00744 A 2019 HvdroCAD Software Solutions LLC
Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Dyn-Stor-lnd method - Pond routing by Dyn-Stor-lnd method
Subcatchment 1S: (new Subcat)Runoff Area=8.270 ac 4.960/o lmpervious Runoff Depth=2.34"
Flow Length=690' Tc=16.9min CN=75 Runoff=23.65 cfs 1.616af
Total Runoff Area= 8.270 ac Runoff Volume = 1.6'16 af Average Runoff Depth = 2.34"
95.04% Pervious = 7.860 ac 4.96% lmpervious = 0.410 ac
138
Summary for Subcatchment 1S: (new Subcat)
Runoff = 23.65 cfs @ 12.26 hrs, Volume= 1.616 af, Depth= 2.34"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
MSE 2+hr 3 10 year Rainfall=4.87"
Area (ac) CN Description
7.860
0.410
74
98
>75% Grass cover, Good, HSG C
Paved parkinq, HSG C
8.270
7.860
0.410
75 Weighted Average
95.04% Pervious Area
4.96% lmpervious Area
Tc Length(min) (fee0 (fuft)(fUsec) (cfs)
Slope Velocity Capacity Description
13.3
2.7
0.9
270
290
'130
0.2000
0.0138
0.1080
0.34
1.76
2.30
Sheet Flow,
Grass: Dense n= 0.240 P2= 2.87"
Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
16.9 690 Total
Subcatchment 1S: (new Subcat)
Hydrograph
24
22
21
20
19
17
16
15
'.9
4
3
2
,|
0
I
I
7
6
5
I
3
2
1
0
MSE 24-hr 3
10 year Rainfall=4.87'!
Runoff Area=8.270 ac
Runoff Volume=1.616 af
Runoff Depth=2.34"
Flow Length=690'
Tc=16.9 min
GN=75
o 2 4 5 810 12 14 161820222426 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Tlm. (hour3)
RSI Marine site Chanhassen,Mn 23953 MSE 24-hr 3 10 year Rainfall=4.87"
Prepared by {enter your company name here} Prinled 112712022
HVdToCAD@ 10.00-25 s/n 00744 O2019 HvdroCAD Software Solutions LLC Paqe 10
mr""tfl
FFFH
i-t_rrTl
+
,l,,tllt
Er6-ta'1
139
RSI Marine site Chanhassen,Mn 23953 MSE 24-hr 3 100 year Rainfall=7.38"
Prepared by {enter your company name here} Prinled 112712022
HydroCAD@ 10.00-25 s/n 00744 A2U9 HydroCAD Software Solutions LLC Paoe 11
Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Dyn-Storlnd method - Pond routing by Dyn-Stor-lnd method
Subcatchment 1S: (new Subcat)Runoff Area=8.270 ac 4.96% lmpervious Runoff Depth=4.49"
Flow Length=690' Tc=16.9 min CN=75 Runoff=45.21 cfs 3.092 af
Total Runoff Are a = 8.270 ac Runoff Volume = 3.092 af Average Runoff Depth = 4.49"
95.04% Pervious = 7.860 ac 4.96% lmpervious = 0.410 ac
140
RSI Marine site Chanhassen,Mn 23953
Prepared by {enter your company name here}
HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC
MSE 24-hr 3 100 year Rainfall=7.38"
Ptinted 112712022
Paqe 12
Summary for Subcatchment 15: (new Subcat)
Runoff = 45.21 cfs @ 12.26 hrs, Volume= 3.092 af, Depth= 4.49"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.0G72.00 hrs, dt= 0.01 hrs
MSE 24-hr 3 100 year Rainfall=7.38"
Area (ac) CN Description
7.860
0.410
74
98
>75% Grass cover, Good, HSG C
Paved Darkinq. HSG C
75 Weighted Average
95.04% Pervious Area
4.96% lmpervious Area
Tc Length(min) (fee0
Slope Velocity Capacity Description(fuft) (fusec) (cfs)
o.u
1.76
2.30
Sheet Flow,
Grass: Dense n= 0.240 P2= 2.87"
Shallow Concentrated Flow,
Grassed WateMay Kv= 15.0 fps
Shallow Goncentrated Flow,
Short Grass Pasture Kv= 7.0 fps
50
48
46
44
Subcatchment 1S: (new Subcat)
I Runoff
38
36
3,1
32
t.,
224t2
20
t8
l6
14
12
't0
I
4
0
1 00 year Rainfall=7.38"
Runoff Area=8.270 ac
Runoff Volume=3.092 af
MSE24-hr 3
CN=75
Runoff Depth=4.49"
Flow Length=690'
Tc=16.9 min
0 2 4 6 8 10 12 '14 16 18 m 22 24 26 28 30 32 34 36 * 10 4244,16,r8 50 52 54 56 58 60 62 64 66 68 70 72llm. (hou6)
8.270
7.860
0.410
13.3
2.7
0.9
270
290
130
0.2000
0.0138
0.1080
16.9 690 Total
Hydrograph
t_r
I
+i
MI_T
141
Routing Diagram for Proposed RSI Marine site Chanhassen 23953
Prepared by {enter your @mpany name hete\, Pnnted 112712022
HydroCAD@ 10-0G25 gn 00744 O 2019 HldroCAD Software Solulions LLC
pond drainage
Direct runoff
stormwater pond
offsite total
Reach Link@A
142
Proposed RSI Marine site Chanhassen 23953
Prepared by {enter your company name here}
HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC
Ptinled 112712022
Paoe 2
Area Listing (all nodes)
Area
(acres)
CN Description
(subcatchmenlnumbers)
5.47 0
2.790
8.260
74
98
82
>7570 Grass cover, Good, HSG C (1S,25)
Paved parking, HSG C (1S,25)
TOTAL AREA
143
Proposed RSI Marine site Chanhassen 23953
Prepared by {enter your company name here}
HydroCAD@ 10.00-25 s/n 00744 A 2Ug HydroCAD Software Solutions LLC
Ptinted 112712022
Paoe 3
Soil Listing (all nodes)
Area
(acres)
Soil
Group
Subcatchment
Numbers
0.000
0.000
8.260
0.000
0.000
8.260
HSG A
HSG B
HSG C
HSG D
Other
1S, 25
TOTAL AREA
144
Proposed RSI Marine site Chanhassen 23953
Prepared by {enter your company name here}
HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC
Printed 112712022
Paqe 4
HSG-A
(acres)
HSG-B
(acres)
HSG.C
(acres)
Ground Covers (all nodes)
HSG-D Other Total
(acres) (acres) (acres)
Ground
Cover
Subcatchment
Numbers
0.000
0.000
0.000
0.000
0.000
0.000
5.470
2.790
8.260
0.000
0.000
0.000
0.000
0.000
0.000
5.47 0
2.790
8.260
>75Yo Grass cover, Good 1S,25
Paved parking 15,25
TOTALAREA
145
Proposed RSI Marine site Chanhassen 23953
Prepared by {enter your company name here}
MSE 24-hr 3 1 year Rainfall=2.50'
Prinled 112712022
HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC Paqe 5
Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Dyn-Stor-lnd method - Pond routing by Dyn-Stor-lnd method
Subcatchment 'lS: pond drainage Runoff Area=7.23o ac 36.790/o lmpervious Runoff Depth=1.06"
Flow Length=43s' Tc=15.8min CN=83 Runoff=9.s4 cfs 0.636af
Subcatchment 25: Direct runoff Runoff Area=1 .03o ac 12.620/o lmpervious Runoff Depth=0.74"
Flow Length=150' f c=12.2 min CN=77 RunofF1.03 cfs 0.064 af
Pond 1P: stormwater pond Peak Elev=728.05' Storage=31,789 cf lnflow=9.54 cfs 0.636 af
Outflow=s.2s cfs 0.636 af
Link 3L: offsite total lnflor,=S.7l cfs 0.700af
Primary=5.71 cfs 0.700 af
Total Runoff Area = 8.260 ac Runoff Volume = 0.700 af Average Runoff Depth = 1.02"
66.22% Pervious = 5.470 ac 33.78% lmpervious = 2.790 ac
146
Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 1 year Rainfall=2.50"
Prepared by {enter your company name here} Prinled 112712022
HydroCAD@ 10.00-25 s/n 00744 A 20'19 HydroCAD Software Solutions LLC Paqe6
Summary for Subcatchment'lS: pond drainage
Runoff = 9.54 ds @ 12.25 hrs, Volume= 0.636 af, Depth= 1.06"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.0G.72.00 hrs, dt= 0.01 hrs
MSE 24-hr 3 1 year Rainfall=2.50"
Area (ac) CN De-sAfiplloD
2.660
4.570
Paved parking, HSG C98
74 >757o Grass cover Good HSG C
Tc Length(min) lfeet)
83 Weighted Average
63.21% Pervious Area
36.79% lmpervious Area
Slope Velocity Capacity Description(fuft) (fusec) (cfs)
6.6
0.9
7.9
0.4
145
115
'100
75
o.37
2.12
o.21
3.52
Sheet Flow,
Grass: Dense n= 0.240 P2= 2.87"
Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Sheet Flow,
Grass: Dense n= 0.240 P2= 2.87"
Shallow Concentrated Flow,
Paved Kv= 20.3 fps
15.8 435 Total
Subcatchment 1S: pond drainage
Hydrograph
8
7
6
5
10
3
2
MSE 24-hr 3
1 year Rainfall=2.50"
Runoff Area=7.230 ac
Runoff Volume=0.636 af
Runoff Depth=l.06"
FIow Length=435'
Tc=l5.8 min
CN=83
0 o 2 4 6 A10 12 14 16 1A 20 22 24 26 2A 30 32 34 36 38 40 42 44 46 4A 50 52 54 56 58 60 62 64 66 68 70 72
Tlm. (hourr)
7.230
4.570
2.660
0.3300
0.0200
0.1000
0.0300
I r Rr""ffl
'-9II
r1
t--r--#
1
147
Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 1 year Rainfall=2.50"
Prepared by {enter your company name here} Ptinled 112712022
HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC PaAe 7
Summary for Subcatchment 25: Direct runoff
Runoff = 1.03 ds @ 12.2'l hrs, Volume= 0.06,4 af, Depth= 0.74"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.0G.72.00 hrs, dt= 0.01 hrs
MSE 24-hr 3 1 year Rainfall=2.50"
Area (ac) CN Description
98
74 >757o Grass cover Good HSG C
Paved parking, HSG C
77 Weighted Average
87.38% Pervious Area
12.62% lmpervious Area
Tc Length(min) lfeet)
Slope Velocity Capacity Description(fuft) (fusec) (cfs)
't0.3
1.9
0.16
0.43
Sheet Flow,
Grass: Short
Sheet Flow,
Grass: Short
n= 0.150
n= 0.150
P2= 2.87"
P2= 2.87"
12.2 150 Total
Subcatchment 25: Direct runoff
Hydrograph
! Runoff
]
-9l!
MSE 24-hr 3
'l year Rainfall=2.50"
Runoff Area=1.030 ac
Runoff Volume=0.064 af
Runoff Depth=O.74"
Flow Length=150'
Tc=12.2 min
CN=77
0 0 2,{ 6 810 1214 16 18 20 22 24 26 2A 30 32 U 36 38 10 1214 46 t1850 5254 56586062 6.66647072
Tlmo (houo)
0.130
0.900
1.030
0.900
0.130
'100 0.0200
50 0.3300
148
Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 1 year Rainfall=2.50"
Prepared by {enter your company name here} Prinled 112712022
HydroCAD@ 10.00-25 sln 00744 @2019 HydroCAD Software Solutions LLC Paqe 8
Summary for Pond 'lP: stormwater pond
lnflow Area =
lnflow
Outflow
Primary
Routing by Dyn-Stor-lnd method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
Starting Elev= 727.50' Surf.Area= 13,M0 sf Storage= 24,288 d
Peak Elev= 728.05'@ 12.45 hrs Surf.Area= '14,020 sf Storage= 31,789 cf
Plug-Flow detention time= 564.5 min calculated for 0.079 af ('12% of inflow)
Center-of-Mass det. time= 41 .3 min ( 866.5 - 825.2 )
7.230 ac, 36.79% lmpervious, lnflow Depth = 1 .06" for 1 year event
9.54 cfs @ 12.25 hts, Volume= 0.636 af
5.25 cfs @ 12.45 hrs, Volume= 0.636 af, Atten= 45ol0, Lag= 12.2 ^ n
5.25 cfs @ 12.45 hrs, Volume= 0.636 af
(7,501 cf above start)
Volume lnvert Avail.Storage Storage Description
#1 722.00',79,976 cf Custom Stage Data (Prismatic) Listed below (Recalc)
lnc.Store Cum.Store(cubic-feet) (cubic-feet)
Elevation
(feet)
Surf.Area
(sq-ft)
Device Routinq
0
4,4U
6,960
12,8U
6,744
30,976
17,968
lnvert Outlet Devices
1,616
2,U8
4,112
'13,040
13,936
17,O40
18,896
0
4,4U
11,424
24,288
31,O32
62,008
79.976
727.50'
725.50',
Device 1
Device 2
18.0" Round Culvert
L= 25.0' RCP, groove end projecting, Ke= 0.200
lnlet / Outlet lnveft= 724.20' I 723.95' S= 0.01 00'/ Cc= 0.900
n= 0.013, Flow Area= 1 .77 sf
4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)
18.0" Round Culvert
L= 30.0' RCP, mitered to conform to fill, Ke= 0.700
lnlet / Outlet lnvert= 725.50' I 725.50' S= 0.0000 '/ Cc= 0.900
n= 0.013, Flow Area= 1 .77 sf
48.0" Horiz Orifice/Grate C= 0.600
Limited to weir flow at low heads
#2
#3
#4 Device 1 730.50'
mary OutFlow Max=5.25 cfs @ 12.45 hrs HW=728.05' TW=0.00' (Dynamic Tailwater)
=Culvert (Passes 5.25 cfs of 17.78 cfs potential flow)
harp-Crested Rectangular Weir (Weir Controls 5.25 cfs @ 2.43 fps)
utvert (Passes 5.25 cfs of 5.59 cfs potential flow)
ce/Grate ( Controls 0.00 cfs)
722.00
724.OO
726.00
727.50
728.00
730.00
731.00
#1 Primary 724.20'
149
Proposed RSI Marine site Chanhassen 23953
Prepared by {enter your company name here}
HvdroCAD@ 10.00-25 sln 00744 O 2019 HydroCAD Software Solutions LLC
MSE 24-hr 3 1 year Rainfall=2.50"
Printed 112712022
Paqe 9
Pond 1P: stormwater pond
Hydrograph
O 216 810121416 18202221 243/) 323,{363840 124161850525156 5a606264 666a7072
Tlm. (hour.)
! lnflowI Primary
t
7
6
5
3
2
0
lnflow Area=7230 ac
Peak Elev=728.05'
Storage=31,789 cfrf-!
^.
l
L-l
ll
150
Elevation
(feet)
Su rface
(sq-ft)
Storage
(cubic-feet)
Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 1 year Rainfall=2.50"
Prepared by {enter your company name here} Printed 112712022
HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC Paqe 10
Stage-Area-Storage for Pond 1P: stormwater pond
Elevation
(feet)
Surface Storage(sqjt) (cubicjeet)
722.00
722.10
722.20
722.30
722.40
722.50
722.60
722.70
722.80
722.90
723.O0
723.10
723.20
723.30
723.40
723.50
t 23_bu
723.70
723.80
723.90
724.00
724.10
724.20
724.30
724.40
724.50
724.60
724.70
724.80
724.90
725.00
725.10
725.20
725.30
725.40
725.50
725.60
725.70
725.80
725.90
726.O0
726.10
726.20
726.30
726.40
726.50
726.60
726.7 0
726.80
726.90
727 .00
727 .10
'1,616
1 ,678
1 ,739
1,801
1 ,862
1 ,924
1 ,986
2,047
2,109
2,170
2,232
2,294
2,355
2,417
2,478
2,540
2,602
2,663
2,725
2,786
2,848
2,g',t 1
2,974
3,038
3,101
3,164
3,227
e ,)on
3,354
3,417
3,480
3,543
3,606
3,670
3,733
3,796
3,859
3,922
3,986
4,049
4,112
4,707
5,302
5,898
6,493
7,088
7,683
8,278
8,874
9,469
10,064
10,659
16s
336
513
AOA
885
1,080
1,282
1,490
1,704
1 ,924
2,150
2,383
2,621
2,866
3,117
3,374
3,637
3,907
4,182
4,464
4,752
5,046
5,U7
5,654
5,967
6,287
6,612
6,945
7 ,283
I ,OZA
7 ,979
8,337
8,700
9,071
9,447
9,830
10,219
10,614
11,016
11,424
'l'1,865
12,365
12,925
13,U5
14,224
14,963
'15,761
16,618
17 ,535
18,512
19,548
727 .20
727 .30
727 .40
727 .50
727 .60
727 .70
727 .80
727 .90
728.00
728.10
728.20
728.30
728.40
728.50
728.60
728.70
728.80
728.90
729.00
729.10
729.20
729.30
729.40
729.50
729.60
729.70
729.80
729.90
730.00
730.10
730.20
730.30
730.40
730.50
730.60
730.70
730.80
730.90
73'1.00
11,254
1 1,850
12,445
13,040
13,219
13,398
13,578
13,7 57
13,936
14,091
14,246
14,402
14,557
14,712
14,867
15,022
15,178
15,333
15,488
15,643
15,798
15,954
16,109
16,264
16,419
16,57 4
16,730
16,885
17 ,040
17 ,226
17 ,411
17,597
17,782
17,968
18,154
18,339
18,52s
18,710
18,896
20,644
21,799
23,014
24,288
25,601
26,932
28,281
29,U7
3't ,032
32,433
33,850
35,283
36,731
38,194
39,673
41 ,167
42,677
44,203
45,744
47 ,301
48,873
50,460
52,063
53,682
55,316
56,966
58,631
60,312
62,008
63,721
65,453
67 ,204
68,972
70,760
72,566
74,391
76,234
78,096
79,976
151
Summary for Link 3L: offsite total
lnflow Area = 8.260 ac, 33.78% lmpervious, lnflow Depth = 1.02" for 1 year eventlnflow = 5.71 cfs @ 12.43 hrs, Volume= 0.700 af
Primary = 5.71 cfs @ 12.43 hrs, Volume= 0.700 af, Atten= 0%, Lag= g.g , n
Primary outflow = lnflow, Time Span= 0.0G72.00 hrs, dt= 0.01 hrs
Link 3L: offsite total
Hydrograph
I lnflow
I Pri,nary
0 2 4 6 81012 1416 1Am2224 2AN32 3,( 36 38 40 42 tl4 4a 48 50 52 54 56 58 60 8264666a70 72
Tlmo (hou6)
.
6
5
3
2
Proposed RSI Marine site Chanhassen 23953 lvlSE 24-hr 3 1 year Rainfall=2.50"
Prepared by {enter your company name here} Printed 112712022
HydroCAD@ 10.00-25 s/n 00744 O 2019 HvdroCAD Software Solutions LLC Paoe 11
1
rrttl lnflow Area=8.260 ac
152
Time span=0.0G72.00 hrs, dt=0.01 hrs, 7201 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Dyn-Stor-lnd method - Pond routing by Dyn-Stor-lnd method
Subcatchment 1S: pond drainage Runoff Area=7.230 ac 36.790lo lmpervious Runoff Depth=1.34"
Flow Length=43s' Tc=15.8min CN=83 Runoff=12.21 cfs 0.809af
Subcatchment 25: Direct runoff Runoff Area=1 .030 ac 12.620/o lmpervious Runoff Depth=o.98"
Flow Length=150' f c=12.2 min CN=77 Runoff=1.40 cfs 0.084 af
Pond lP: stormwater pond Peak Elev=728.20' Storage=33,894 ct l^llow=12.21 cfs 0.809 af
Outflow=6.30 cfs 0.809 af
Link 3L: offsite total lnflow=6.94 cfs 0.893 af
Primary=6.94 cfs 0.893 af
Total Runoff Area = 8.260 ac Runoff Volume = 0.893 af Average Runoff Depth = 1.30"
66.22% Pervious = 5.470 ac 33.78% lmpervious = 2.790 ac
Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 2 year Rainfall=2.87"
Prepared by {enter your company name here} Ptinled 112712022
HvdroCAD@ 10.00-25 s/n 00744 02019 HydroCAD Software Solutions LLC Paoe 12
153
Summary for Subcatchment 1S: pond drainage
Runoff = 12.21 cls @ 12.25 hrs, Volume= 0.809 af, Depth= 1.34"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
MSE 24-hr 3 2 yeat Rainlall=2.87"
Area (ac) CN Description
Tc Length(min) (feet)
Slope Velocity Capacity Description(fuft) (tusec) (cfs)
6.6
0.9
-70
o.4
145
115
100
75
o.37
2.12
o.21
3.52
0.3300
0.0200
0.1000
0.0300
Sheet Flow,
Grass: Dense n= 0.240 P2= 2.87"
Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Sheet Flow,
Grass: Dense n= 0.240 P2= 2.87"
Shallow Concentrated Flow,
Paved Kv= 20.3 fps
15.8 435 Total
Subcatchment 1S: pond drainage
Hyd.ograph
]!
13
12
1'l
10
I
I
7
6
5
4
3
2
I
0
Ru
-r-----+---t
l
tlI
l
R
ri
u
miTc=15.
o 2 4 6 A10 12 14 16 1A 20 22 24 26 2A 3n 32 34 36 3a 40 42 44 46 4A 50 52 54 56 58 60 62 64 66 68 70 72
Time (houB)
Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 2 year Rainfall=2.87"
Prepared by {enter your company name here} Prinled 112712022
HvdroCAD@ 10.00-25 s/n 00744 O2019 HvdroCAD Software Solutions LLC Paqe 13
2.660 98 Paved parking, HSG C4.570 74 >75% Grass cover, Good, HSG C
7.230
4.570
2.660
83 Weighted Average
63.21% Pervious Area
36.79% lmpervious Area
Ir il;;rril
I
ffii
+
I
i-tr1
-rt-T--I
I
_t
|-1H
II
---f--r---l---t---a---
154
Summary for Subcatchment 25: Direct runoff
Runoff = 1.4O cfs @ 12.21 hrs, Volume= 0.084 af, Depth= 0.98"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
MSE 24-hr 3 2 year Rainfall=2.87"
Area (ac) CN Description
0.1 30
0.900 >75% Grass cover Good HSG C
Paved parking, HSG C
1.030
0.900
0.1 30
77 Weighted Average
87.38% Pervious Area
12.62% lmpervious Area
Tc Length(min) (fee0
Slope Velocity Capacity Description(fuft) (fUsec) (cfs)
10.3
1.9
100 0.0200
50 0.3300
Sheet Flow,
Grass: Short
Sheet Flow,
Grass: Short
n= 0.150
n= 0.150
P2= 2.87"
P2= 2.87"
12.2 150 Total
Subcatchment 25: Direct runoff
Hydrograph
! Runofi
!
Runoff Depth=0.98"
Flow Length=150'
Tc='12.2 min
CN=77
Runoff Volume=0.084 af
MSE 24-hr 3
2year Rainfall=2.87'!
Runoff Area=l.030 ac
0 o 2 4 6 A 10 1214 16 18202224?62A303234 3a40 4244 46 48 s0 52 54 56 58 60 62 64 66 68 70 72
Tnie (hours)
Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 2 year Rainfall=2.87"
Prepared by {enter your company name here} Ptinted 112712022
HvdroCAD@ '10.00-25 s/n 00744 O2019 HydroCAD Software Solutions LLC Paqe 14
OR
74
0. '16
0.43
1
155
Proposed RSI Marine site Chanhassen 23953
Prepared by {enter your company name here}
HydroCAD@ '10.00-25 sin 00744 @ 2019 HydroCAD Software Solutions LLC
MSE 24-hr 3 2 year Rainfall=2.87"
Printed 112712O22
Paqe 15
lnflow Area =
lnflow
Outflow
Primary
Routing by Dyn-Stor-lnd method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
Starting Elev= 727.50' Surf.Area= '13,040 sf Storage= 24,288 d
Peak Elev= 728.20' @ 12.46 hrs Surf.Area= 14,251 sf Storage= 33,894 cf
Plug-Flow detention time= 339.1 min calculated for 0.251 af (31% of inflow)
Center-of-Mass det. time= 38.6 min ( 858.7 - 820.1 )
Volume lnvert Avail.QlqAge 9loJage Description
Summary for Pond lP: stormwater pond
7.23O ac, 36.79% lmpervious, lnflow Depth = 1.34" for 2 year event
12.21 ds @ 12.25 hrs, Volume= 0.809 af
6.30 cfs @ 12.46 hrs, Volume= 0.809 af, Atten= 48%, Lag= 13., ,'n
6.30 cfs @ 12.46 hrs, Volume= 0.809 af
(9,606 cf above start)
lnc.Store Cum.Store(cubic-feet) (cubic-feet)
Elevation
(feet)
Surf.Area
(sq-ft)
Device Routing
0
4,464
6,960
12,8U
6,744
30,976
17,968
lnvert Outlet Devices
1,616
2,848
4.112
13,040
13,936
17,O40
18,896
0
4,464
11,424
24,288
31,032
62,008
79,976
#1 Primary 724.20'18.0" Round Culvert
L= 25.0' RCP, groove end projecting, Ke= 0.200
lnlet i Outlet lnveft= 724.20' I 723.95' S= 0.0100 '/ Cc= 0.900
n= 0.013, Flow Area= 1 .77 sf
4.0' long Sharp4rested Rectangular Weir 2 End Contraction(s)
18.0" Round Culvert
L= 30.0' RCP, mitered to conform to fill, Ke= 0.700
lnlet / Outlet lnvert= 725.50' / 725.50' S= 0.0000 '/ Cc= 0.900
n= 0.013, Flow Area= 1 .77 sf
48.0" Horiz. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#2
#3
#4
Device 1
Device 2
727.50',
725.50'.
Device 1 730.s0'
rimary OutFlow Max=6.29 cfs @ 12.46 hrs HW=728.20' TW=0.00' (Dynamic Tailwater)
=Culvert (Passes 6.29 cfs of 18.28 cfs potential flow)
Sharp-Crested Rectangular Weir (Passes 6.29 cfs ol 7.44 cfs potential flow)
ulvert (lnlet Controls 6.29 cfs @ 3.56 fps)
rifice/Grate ( Controls 0.00 cfs)
#1 722.00' 79,976 cf Gustom Stage Data (Prismatic) Listed below (Recalc)
722.OO
724.00
726.00
727.50
728.O0
730.00
731.00
156
Proposed RSI Marine site Chanhassen 23953
Prepared by {enter your company name here}
HydroCAD@ 10.00-25 s/n 00744 @ 2019 HydroCAD Software Solutions LLC
MSE 24-hr 3 2 year Rainfall=2.87"
Printed 112712022
Paoe 16
'
Pond 1P: stormwater pond
Hydrograph
0 2 4 6 810121416 18202224262830 3234363840 4244464A505254 56 58 60 62 64 66 6a 70 72
Time (houE)
7
I lnflowI P.imaryI:l.t2 2
t-I lf llrElaIEI/:t ,
ICsrfoC l€3 3 t,
o 4 (;f
I-
I
III
ilT
tIIr
rI
11
lnflow Area=7.230 ac
+-T
157
Elevation
(feet)
Surface
(sq-ft)
Storage
(cubicJeet)
Proposed RSI Marine site Chanhassen 23953 tilSE 24-hr 3 2 year Rainfall=2.87"
Prepared by {enter your company name here} Printed 112712022
HydroCAD@ '10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC Paoe 17
Stage-Area-Storage for Pond 1P: stormwater pond
Elevation
(feet)
Surface Storage(sq-ft) (cubic-feet)
722.00
722.10
722.20
722.30
722.40
722.50
722.60
722.70
722.80
722.90
723.00
723.10
723.20
723.30
723.40
723.50
723.60
723.7 0
723.80
723.90
724.00
724.'tO
724.20
724.30
724.40
724.50
724.60
724.70
724.80
724.90
725.00
725.10
725.20
725.30
725.40
725.50
725.60
725.70
725.80
725.90
726.00
726.10
726.20
726.30
726.40
726.50
726.60
726.70
726.80
726.90
727 .00
727 .10
1,616
1,678
1 ,739
1,801
I ,OOZ
1,924
1,986
2,047
2,109
2,170
2,232
2,294
2,355
2,417
2,478
2,540
2,602
Z,bOJ
2,725
2,786
2,848
2,911
2,974
3,038
3,101
3,164
3,227
3,290
3,354
3,417
3,480
3,543
3,606
3,670
3,733
3,796
3,859
3,922
3,986
4,049
4,112
4,707
5,302
5,898
6,493
7,088
/,bd5
8,278
8,874
9,469
10,064
10,659
0.165
336
513
696
885
1,080
1 ,282
1 ,490
I ,704
1 ,924
2,150
2,383
2,621
2,866
3,',\17
3,374
3,637
3,907
4,182
4,464
4,752
5,046
5,347
5,654
5,967
6,287
6,612
6,945
7 ,283
7 ,628
7 ,979
8,337
8,700
I,O71
I,447
9,830
10,219
'10,614
11,016
11,424
1'1,865
12,365
12,925
13,545
14,224
14,963
'15,761
16,618
17,535
18,512
19,548
727 .20
727 .30
727 .40
727 .50
727 .60
727 .70
727 .80
727 .90
728.00
728.10
728.20
728.30
728.40
728.50
728.60
728.70
728.80
728.90
729.00
729.10
729.20
729.30
729.40
729.50
729.60
729.70
729.80
729.90
730.00
730.10
730.20
730 30
730.40
730.50
730.60
730.70
730.80
730.90
731.00
20,644
21 ,799
23,O14
24,288
25,601
26,932
28,281
29,647
31 ,032
32,433
33,850
35,283
36,731
38,194
39,673
41 ,167
42,677
44,203
45,744
47 ,301
48,873
50,460
52,063
s3,682
s5,316
56,966
58,631
60,312
62,008
63,721
65,453
67 ,204
68,972
70,760
72,566
74,391
76,234
78,096
79,976
11,254
1 1,850
12,445
13,040
13,219
13,398
'13,578
13,757
13,936
14,091
14,246
14,402
14,557
14,712
14,867
15,022
15,17I
15,333
15,488
15,643
15,798
15,954
16,'109
16,264
16,419
16,574
16,730
16,885
17 ,040
17 ,226
17 ,411
17,597
17 ,782
17,968
18,154
18,339
18,525
18,710
'18,896
158
Proposed RSI Marine site Chanhassen 23953
Prepared by {enter your company name here}
MSE 24-hr 3 2 year Rainfall=2.87"
Ptinled 112712022
Paoe 1 8HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC
lnflow Area =
lnflow
Primary
Primary outflow = lnflow, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
Link 3L: offsite total
Hydrograph
8.260 ac, 33.78% lmpervious, lnflow Depth = 1.30" for 2 year event
6.94 cfs @ 12.38 hrs, Volume= 0.893 af
6.94 cfs @ 12.38 hrs, Volume= 0.893 af, Atten= 0%, Lag= 9.6 , n
I lniow! Pnmary
t
7
6
5
3
2
0 2 4 6 810 12 141618202221 2A3O32U 3630a04244,1648 5052 54s65860 626466687072
Tlm. (hour!)
@E
Summary for Link 3L: offsite total
1
lnflow Area=8.260 ac
i----l_-l ---+ t -
%
Z
2
159
Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 10 year Rainfall=4.27"
Prepared by {enter your company name here} Ptinled 112712022
HydroCADrO 10.00-25 s/n 00744 AzUg HydroCAD Software Solutions LLC Paqe 19
Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Dyn-Stor-lnd method - Pond routing by Dyn-Storlnd method
Subcatchment 15: pond drainage Runoff Area=7.230 ac 36.79% lmpervious Runoff Depth=2.52"
Flow Length=435' Tc=15.8 min CN=83 Runoff=22.99 cfs 1.520af
Subcatchment 25: Direct runoff RunoffArea=1.030 ac 12.620/o lmpervious Runoff Depth=2.03"
Flow Length=150' Tc=12.2 min CN=77 Runoff=2 .97 cls 0.174 aI
Pond 1P: stormwater pond Peak Elev=728.95' Storage=44,917 cf lnflow=22.99 cfs 1.520af
Outflow=g.03 cfs 1 .520 af
Link 3L: offsite total lnflow=10.23 cfs 1.693 af
Primary=19 23 cfs 1'693 af
Total Runoff Area = 8.260 ac Runoff Volume = 1.693 af Average Runoff Depth = 2.46"
66.22% Pervious = 5.470 ac 33.78olo lmpervious = 2.790 ac
160
Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 10 year Rainfall=4.27"
Prepared by {enter your company name here} Prinled 112712022
HydroCAD@ 10.00-25 s/n 00744 02019 HfdroQAqsoft\ryeEsq&!!9llS LLC Paoe 20
Summary for Subcatchment'lS: pond drainage
Runoff = 22.99 cls @ 12.24 hrs, Volume= '1.520 af , Depth= 2.52"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.0G72.00 hrs, dt= 0.0'l hrs
MSE 24-hr 3 10 yeat Rainfall4.27"
Area (ac) CN Description
Tc
(min)
Length
(feet)
Slope Velocity Capacity Description(fuft) (fusec) (cfs)
6.6
0.9
7.9
o.4
145
115
100
75
0.3300
0.0200
0.1000
0.0300
0.37
2.12
0.21
3.52
Sheet Flow,
Grass: Dense n= 0.240 P2= 2.87"
Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Sheet Flow,
Grass: Dense n= 0.240 P2= 2.87"
Shallow Concentrated Flou
Paved Kv= 20.3 fps
25
24
22
21
20
19
18
17
15.8 435 Total
Subcatchment 1S: pond drainage
Hydrograph
I Runoff
5
4
3
2
I
0I
8
7
6
5
4
3
2
1
0
GN=83
MSE 24-hr 3
10 year Rainfall=4.27"
Runoff Area=7.230 ac
Runoff Volume=1;520 af
Runoff Depth=2.52"
Flow Length=435'
Tc=15.8 min
0 2 4 6 810 12 14 16 1A 20 22 24 X 2A 30 32 34 36 38 40 42 44 46 4A 50 52 54 56 58 60 62 64 66 68 70 72
Tlm€ (hou.!)
2.660 98 Paved parking, HSG C4.570 74 >75olo Grass cover. Good. HSG C
7.230 83 Weighted Average4.570 63.21% Pervious Area2.660 36.79% lmpervious Area
'-9
ltrt
t---f--T---a---t
I
_ffi
J
t1i
t---t-I-i---l---]---- t
-ffi
-T.TTTTTTTTT
161
Proposed RSI Marine site Chanhassen 23953
Prepared by {enter your company name here}
HydroCAD@ 10.00-25 s/n 00744 A zxg HydroCAD Software Solutions LLC
MSE 24-hr 3 10 year Rainfall=4.27"
Printed 112712022
Paqe 21
Summary for Subcatchment 25: Direct runoff
Runoff = 2.97 cfs @ 12.21 hrs, Volume= 0.174 af, Depth= 2.03"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
MSE 24-hr 3 10 year Rainfall=4.27"
Area (ac) CN Description
1.030
0.900
0130
Tc Length(min) (fee0
Slope Velocity Capacity Description(fuft) (fusec) (cfs)
10.3
1.9
0.16
0.43
100
50
0.0200
0.3300
Sheet Flow,
Grass: Short
Sheet Flow,
Grass: Short
n= 0.150
n= 0.150
P2= 2.87"
P2= 2.87"
12.2 150 Total
3
2
'-9
MSE 24-hr 3
10 year Rainfal!=4.27"
Runoff Area=1.030 ac
Runoff Volume=0.174 af
Runoff Depth=2.03"
Flow Length=150'
Tc=12.2 min
CN=77
0 0 2 4 6 8 1012't1 16 18 20 22 24 26 28 30 32 U 36 38 40 42 ,14 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Tlm. (hours)
0.130
0 900
98 Paved parking, HSG C74 >75% Grass cover, Good, HSG C
77 Weighted Average
87.38% Pervious Area
12.62% lmpervious Area
Subcatchment 25: Direct runoff
Hydrograph
li R,""til
162
Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 10 year Rainfall=4.27"
Prepared by {enter your company name here} Ptinted 112712022
HvdroCAD@ 10,0Q-2E S/n QQ744 O2019 HydroCAD Software Solutions LLC Paae 22
Summary for Pond 1P: stormwater pond
7 .230 ac, 36.79% lmpervious, lnflow Depth = 2.52" for 10 year event
22.99 cfs @ 12.24 hrs, Volume= 1.520 af
9.03 cfs @ 12.53 hrs, Volume= 1.520 af, Atten= 6'l%, Lag= 17.1 , n
9.03 cfs @ 12.53 hrs, Volume= 1.520 al
Routing by Dyn-Stor-lnd melhod, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
Starting Elev= 727.50' Surf.Area= 13,040 sf Storage= 24,288 d
Peak Elev= 728.95' @ '12.53 hrs Surf.Area= 15,405 sf Storage= M,917 cl (20,629 cf above start)
Plug-Flow detention time= 176.7 min calculated for 0.962 af (63% of inflow)
Center-of-Mass det. time= 37.6 min ( 845.0 - 807.4 )
Volume lnvert Avail.Storage Storage Description
#1 722.00',79,976 cf Custom Stage Data (Prismatic) Lisled below (Recalc)
lnc.Store Cum.Store(cubic-feet) (cubic-feet)
Elevation
(feeo
Surf.Area
(sq-ft)
722.00
724.OO
726.00
727.50
728.00
730.00
731.00
Device Routinq
1,616
2,U8
4,112
13,040
13,936
17,O40
18,896
4,464
6,960
12,864
6,7M
30,976
17,968
0
4,4U
11,424
24,288
31,032
62,008
79,976
#1 Primary 724.20'
727.50'
725.50',
Device 1
Device 2
18.0" Round Culvert
L= 25.0' RCP, groove end poecting, Ke= 0.200
lnlet / Outlet lnveft= 724.20' I 723.95' S= 0.0100 '/ Cc= 0.900
n= 0.013, Flow Area= 1.77 sf
4.0' long Sharp4rested Rectangular Weir 2 End Contraction(s)
18.0" Round Culvert
L= 30.0' RCP, mitered to conform to fill, Ke= 0.700
lnlet / Outlet lnvert= 725.50' / 725.50' S= 0.0000 '/ Cc= 0.900
n= 0.013, Flow Area= 1 .77 sf
48.0" Horiz. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#2
#3
#4 Device 1 730.50'
frimary OutFlow Max=9.03 cfs @ 12.53 hrs HW=728.95' TW=0.00' (Dynamic Tailwaler)t-1=Culvert (Passes 9.03 cfs of 20.60 cfs potential flow)
?-?=Sharp'-crested Rectangular Weir (Passes 9.03 cfs of 21 .1 1 cfs potential flow)
I t-3=Gulvert (lnlet Controls 9.03 cfs @ 5.1 1 fps)
l-4=orifice/Grate ( Controls 0.00 cfs)
lnflow Area =
lnflow
Outflow
Primary
lnvert Outlet Devices
163
Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 10 year Rainfall=4.27"
Prepared by {enter your company name here} Prinled 112712O22
HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC Paqe 23
Pond 1P: stormwater pond
Hydrograph
'-9
0 2 4 6 A 101214 16 1A202224262A30 3234363840 4244464A505254 56 58 60 62 64 66 68 70 72
Time (hours)
II lnrlow
!!
I
lr rfl(,\V I \t e a r z 3 u a c
{lFIeI ti )t I)
)I)i'
'fCI-A A C I ,|.,
I
\
^
KI
+T
I
r
I
!
l
rltllrl:t!:lrlrli ij +_i
l1
-l
164
Elevation
(feet)
Su rface
(sq-ft)
Storage
(cubic-feet)
Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 10 year Rainfall=4.27"
Prepared by {enter your company name here} Printed 112712022
HydroCAD@ 10.00-25 s/n 00744 42019 HydroCAD Software Solutions LLC Paoe 24
Stage-Area-Storage for Pond 1P: stormwater pond
Elevation
(feet)
Surface Storage(sqjt) (cubic-feet)
722.00
722.10
722.20
722.30
722.40
722.50
722.60
722.70
722.80
722.90
723.00
723.10
723.20
723.30
723.40
723.50
723.60
723.70
723.80
723.90
724.00
724.10
724.20
724.30
724.40
724.50
724.60
724.70
724.80
724.90
725.00
725.10
725.20
725.30
725.40
725.50
725.60
725.70
725.80
725.90
726.00
726.10
726.20
726.30
726.40
726.50
726.60
726.70
726.80
726.90
727 .00
727 .10
1,616
1,678
1,739
1,801
1,862
1,924
1,986
2,047
2,109
2,170
2,232
2,294
2,355
2,417
2,478
2,540
2,602
2,663
2,725
2,786
2,848
2,911
2,974
3,038
3,101
3,164
3,227
3,290
3,354
3,417
3,480
3,543
3,606
3,670
3,733
3,796
3,859
3,922
3,986
4,049
4,112
4,707
5,302
5,898
6,493
7,088
7,683
8,278
8,874
9,469
10,064
10,659
0
165
336
696
88s
1,080
1 ,282
1 ,490
1 ,704
1,924
2,150
2,383
2,621
2,866
3,117
3,374
3,637
3,907
4,182
4,464
4,752
5,046
5,347
5,654
s,967
6,287
6,612
6,945
7 ,283
7 ,628
7 ,979
8,337
8,700
9,071
I,447
9,830
10,219
10,614
11,016
11,424
11,865
12,365
12,925
13,545
14,224
14,963
't5,761
16,618
17,535
18,512
19,548
727.20
727 .30
727 .40
727 .50
727 .60
727 .70
727 .80
727 .90
728.00
728.10
728.20
728.30
728.40
728.50
728.60
728.70
728.80
728.90
729.00
729.10
729.20
729.30
729.40
729.50
729.60
729.7 0
729.80
729.90
730.00
730.10
730.20
730.30
730.40
730.50
730.60
730.70
730.80
730.90
731.00
11,254
1 1,850
12,445
13,040
13,219
13,398
13,578
13,757
13,936
14,091
14,246
14,402
14,557
14,712
14,867
15,O22
15,178
15,333
15,488
1 5,643
15,798
15,954
16,109
16,264
16,419
16,574
16,730
16,885
17 ,O40
17 ,226
17,411
17 ,597
17 ,782
17,968
18,154
18,339
18,710
18,896
20,644
21 ,799
23,O14
24,288
25,601
26,932
28,281
29,647
31,032
32,433
33,850
35,283
36,731
38, 'r 94
39,673
41 ,167
42,677
44,203
45,744
47 ,301
48,873
50,460
52,063
53,682
55,316
s6,966
58,631
60,312
62,008
63,72'l
65,453
67 ,204
68,972
70,760
72,566
74,391
76,234
78,096
79,976
165
Summary for Link 3L: offsite total
lnflow Area = 8.260 ac, 33.78o/o lmpervious, lnflow Depth = 2.46" for 10 year eventlnflow = 10.23 cfs @ 12.30 hrs, Volume= 1.693 af
Primary = 10.23 cfs @ 12.30 hrs, Volume= 1.693 af, Atten= 0%, Lag= 9.6 r'n
Primary outflow = lnflow, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
Link 3L: offsite total
Hydrograph
I lnflowI Primary
11
'.9
I
7
6
5
4
0 2 4 6 8101214 16 1A2O221 2A3O 32 321 363840 12 11 46 1A 50 52 51 56 58 60 62 64 66 6a ?0 72
Tln|. (hou.!)
lnflow Area=8.260 ac
Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 10 year Rainfall=4.27"
Prepared by {enter your company name here} Prinled 112712022
HydroCAD@ 10.00-25 s/n 00744 O 2019 HvdroCAD Software Solutions LLC Paoe 25
i
tll
Tro,3d;l
166
Proposed RSI Marine site Chanhassen 23953 MSE 24'hr 3 100 year Rainfall=7.38"
Prepared by {enter your company name here} Printed 112712022
HydroCAD@ 10.00-25 sln 00744 O20'19 HydroCAD Software Solutions LLC Paoe 26
Time span=0.0G72.00 hrs, dt=0.01 hrs, 7201 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Dyn-Stor-lnd method - Pond routing by Dyn-Stor-lnd method
Subcatchment 15: pond drainage RunoffArea=7.230 ac 36.79Yo lmpervious Runoff Depth=5.39"
Flow Length=435' Tc=15.8min CN=83 Runoff=47.98 cfs 3.246 af
Subcatchment 25: Direct runoff Runoff Area=1.030 ac '12.620/o lmpervious Runoff Depth=4.71"
Flow Length=150' Tc=12.2 min CN=77 RunofF6.84 cfs 0.404 af
Pond'lP: stormwater pond Peak Elev=730.70' Storage=74,299 cf lnflow=47.98 cfs 3.246 af
Outflolr,= 16.96 cfs 3.246 af
Link 3L: offsite total lnflow=18.76 cfs 3.650 af
Primary=18.76 cfs 3.650 af
Total Runoff Area = 8.260 ac Runoff Volume = 3.650 af Average Runoff Depth = 5.30"
66.22% Pervious = 5.470 ac 33.78% lmpervious = 2.790 ac
167
Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 100 year Rainfall=7.38"
Prepared by {enter your company name here} Printed 112712022
HydroCAD@ 1 0.00-25 s/n 00744 A 2019 HydroCAD Software Solutions LLC Paqe 27
Summary for Subcatchment 1S: pond drainage
Runoff = 47.98 cfs @ 12.24 hrs, Volume= 3.246 af, Depth= 5.39"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.0G72.00 hrs, dt= 0.01 hrs
MSE 24-hr 3 '100 year Rainfall=7.38"
Area (ac) CN Description
Paved parking, HSG C98
74 >757o Grass cover Good HSG C
7.230
4.570
2.660
Tc Length(min) (feet)
83 Weighted Average
63.21olo Pervious Area
36.79olo I mpervious Area
Slope Velocity Capacity Description(fuft) (fusec) (cfs)
0.37
2.',12
0.21
3.52
Sheet Flow,
Grass: Dense n= 0.240 P2= 2.87"
Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Sheet Flow,
Grass: Dense n= 0.240 P2= 2.87"
Shallow Concentrated Flow,
Paved Kv= 20.3 fps
Subcatchment 1S: pond drainage
Hydrograph
I Runoff
E'o
3"u
20
50
45
40
35
10
0
MSE 24-hr 3
1 00 year Rainfall=7.38"
Runoff Area=7.230 ac
Runoff Volume=3.246 af
Runoff Deplh=S.39"
FIow Length=435'
Tc=15.8 min
CN=83
o 216 A 10 12 14 16 18 20222426 28 30 32 34 36 3A 40 42 44 46 48 s0 52 54 56 58 60 62 U 6 68 70 72
Tlme (houB)
2.660
4.570
6.6
0.9
7.9
o.4
145 0.3300
1 15 0.0200
100 0.1000
75 0.0300
15.8 435 Total
l
I
168
Summary for Subcatchment 25: Direct runoff
Runoff = 6.84 ds @ 12.20 hrs, Volume= 0.404 af, Depth= 4.71"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
MSE 24-hr 3 100 year Rainfall=7.38"
Area (ac) CN Description
98
74 >75% Grass cover Good HSG C
Paved parking, HSG C
77 Weighted Average
87.38% Pervious Area
12.62% lmpervious Area
Tc Length(min) (fee0 (fuft)(fusec) (cfs)
Slope Velocity Capacity Description
10.3
1.9
100 0.0200
50 0.3300
0.16
0.43
Sheet Flow,
Grass: Short
Sheet Flow,
Grass: Short
n= 0.150
n= 0.150
P2= 2.87"
P2= 2.87"
12.2 150 Total
Subcatchment 25: Direct runoff
Hydrograph
I Runoff
'-9
7
6
5
3
2
Runoff Area=1.030 ac
Runoff Volume=0.404 af
Runoff Depth=4.71"
Flow Length=l5
Tc=12.2 min
CN=77
MSE 24-hr 3
f 00 year Rainfall=7.38"
0 02468101214 16 ft 20 22 24 26 2A 30 32 U 6 * 40 42 44 46 t{J 50 52 54 55 58 60 62 64 66 68 70 72
Tlme (hourt)
Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 100 year Rainfall=7.38"
Prepared by {enter your company name here} Ptinled 112712022
HvdroCAD@ '10.00-25 s/n 00744 02019 HvdroCAD Software Solutions LLC Paoe 28
0.130
0.900
1.030
0.900
0. 130
169
Proposed RSI Marine site Chanhassen 23953
Prepared by {enter your company name here}
MSE 24-hr 3 100 year Rainfall=7.38"
Ptinted 112712022
H roCAD@ 10.00-25 sln 00744 O2019 H roCAD Software Solutions LLC
Summary for Pond 1P: stormwater pond
7.23O ac, 36.79% lmpervious, lnflow Depth = 5.39" for '100 year event
47.98 cfs @ 12.24 hrs, Volume= 3.246 al
16.96 cfs @ 12.U hrs, Volume= 3.246 af , Atten= 65%, Lag= 16.2 , n
16.96 cfs @ 12.54 hrs, Volume= 3.246 al
lnflow Area =
lnflow
Outflow
Primary
Routing by Dyn-Stor-lnd method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
Starting Elev= 727.50' Surf.Area= 13,040 sf Storage= 24,288 ct
Peak Elev= 73O.7O'@ 12.54 hrs Surf.Area= 18,330 sf Storage= 74,299 ct (50,011cf above start)
Plug-Flow detention time= 130.2 min calculated for 2.688 af (83% of inflow)
Center-of-Mass det. time= 44.3 min ( 836.5 - 792.2 )
Volume lnvert Avail.Storaqe Storaqe Descri ption
#1 722.00',79,976 ct Custom Stage Data (Prismatic) Listed below (Recalc)
lnc.Store Cum.Store(cubic-feet) (cubic-feet)
Elevation
(feet)
Surf.Area
(sq-ft)
722.O0
724.00
726.O0
727.50
728.OO
730.00
731.00
Device Routing lnvert Outlet Devices
1 ,616
2,U8
4,112
13,040
13,936
17.U0
18,896
0
4,4U
6,960
12,864
6.744
30,976
17,968
0
4AU
11,424
24,288
3',t,032
62,008
79,976
#1 Primary 724.20',18.0" Round Culvert
L= 25.0' RCP, groove end projecting, Ke= 0.200
lnlet / Outlet lnverl= 724.20' 1 723.95' S= 0.01 00'/ Cc= 0.900
n= 0.013, Flow Area= 1 .77 sf
4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)
18.0" Round Culvert
L= 30.0' RCP, mitered to conform to fill, Ke= 0.700
lnlet / Outlet lnvert= 725.50' 1725.50' S= 0.0000'/ Cc= 0.900
n= 0.013, Flow Area= 1 .77 sf
48.0" Horiz. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#2
#3
Device 1
Device 2
727.50',
725.50'
#4 Device 1 730.50',
rimary OutFlow Max=16.96 ds@12.U hrs HW=730.69' TW=0.00' (Dynamic Tailwater)
=Culvert (Passes '16.96 cfs ol 25.23 cfs potential flow)
=Sharp-Crested Rectangular Weir (Passes 13.42 cls of 62.76 cfs potential flow)
=Culvert (lnlet Controls 13.42 cfs @ 7.59 fps)
rifice/Grate (Weir Controls 3.54 cfs @ 1.44 fW)
170
Proposed RSI Marine site Ghanhassen 23953
Prepared by {enter your company name here}
MSE 24-hr 3 100 year Rainfall=7.38"
Prinled 112712022
Paoe 30HydroCAD@ 10.00-25 s/n O 2019 HvdroCAD Software Solutions LLC
'-9E
o 2 4 6 I 10 12 14 16 14202221
Pond 1P: stormwater pond
Hydrograph
28 30 32 34 36 3a 40 42 4 I 1A fi 52 51 56 58 60 82 64 6 A 70 72
llrro (houB)
Int I e I Z tt at!tl l(,l v \t d'
JIEaKlIE ,t I n ,
,u v (!I t c I C l€I 4 I,
-
II
lIIrIIIIIIlfltilflIIlil1
a
IlllllI1ililII llltIIIlllllflltIIIIl
ltr
I lnfowI Primaryffi
t
-//
f'616ds
171
Elevation
(feet)
Su rface
(sq-ft)
Storage
(cubic-feet)
Elevation
(feet)
Su rface Storagesq-ft) (cubic-feet)
722.00
722.10
722.20
722.30
722.40
722.50
722.60
722.70
722.80
722.90
723.00
723.10
723.20
723.30
723.40
723.50
723.60
723.70
723.80
723.90
724.00
724.10
724.20
724.30
724.40
724.50
724.60
724.70
724.80
724.90
725.00
725.10
725.20
725.30
725.40
725.50
725.60
725.70
725.80
725.90
726.00
726.10
726.20
726.30
726.40
726.50
726.60
726.70
726.80
726.90
727 .00
727 .10
1,616
1,678
1 ,739
1,801
1 ,862
1 ,924
1,986
2,047
2,109
2,170
2,232
2,294
2,355
2,417
2,478
2,U0
2,602
2,663
2,725
2,786
2,848
2,911
2,974
3,038
3,101
3,164
3,227
3,290
3,3s4
3,417
3,480
3,543
3,606
3,670
3,733
3,796
3,859
3,922
3,986
4,049
4,112
4,707
5,302
5,898
6,493
7,088
7,683
8,278
I,874
9,469
10,064
10,659
727 .20
727 .30
727 .40
727 .50
727 .60
727.70
727 .80
727 .90
728.00
728.10
728.20
728.30
728.40
728.50
728 60
728.70
728.80
728.90
729.00
729.10
729.20
729.30
729.40
729.50
729.60
729.70
729.80
729.90
730.00
730.10
730.20
730.30
730.40
730.50
730.60
730.70
730.80
730.90
731.00
11,254
1 1,850
12,445
13,040
13,219
13,398
13,578
13,757
't 3,936
14,091
14,246
14,402
14,557
14,712
14,867
15,022
't5,178
15,333
'15,488
15,643
15,798
15,954
16,109
16,264
'16,419
16,57 4
16,730
16,885
17 ,040
17 ,226
17,411
17,597
17,782
17,968
18,154
18,339
18,525
18,710
18,896
20,u4
21,799
23,014
24,288
25,601
26,932
28.281
29,647
31 ,032
32,433
33,850
35,283
36,731
38,194
39,673
41,167
42.677
44.203
45,744
47 ,301
48,873
50,460
52,063
53,682
55,3'16
s6,966
58,631
60,312
62,008
63,721
65,453
67 ,204
68,972
70,760
72,566
74.391
76,234
78,096
79,976
Proposed RSI Marine site Chanhassen 23953 tlSE 24-hr 3 100 year Rainfall=7.38"
Prepared by {enter your company name here} Ptinted 112712022
HvdroCAD@ 10.00-25 s/n 00744 020'19 HvdroCAD Software Solutions LLC Paqe 31
Stage-Area-Storage for Pond 1P: stormwater pond
0
165
336
513
696
885
1,080
1,282
'I ,490
I ,704
1 ,924
2,',150
2,383
2,621
2,866
3,117
3,374
3,637
3,907
4,182
4AU
4,752
5,046
5,U7
5,654
5,967
6,287
6,612
6,945
7 ,283
7 ,628
7 ,979
8,337
8,700
9,071
9,447
9,830
10,219
10,614
11,016
11,424
1 1,865
12,365
't2,925
13,545
14,224
14,963
15,761
16,618
17,535
18,512
19,548
172
Primary outflow = lnflow, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
Link 3L: offsite total
Hydrograph
21
20
19
t8
17
16
15
11
13
i12
l, 11
er0E9
I
7
6
5
I
3
2
1
0
! lnfowI Pnmary
0 2 4 6 8 t0 12 14 16 1A202224 2A30 32 34 36 38 40 42 4 4 14 50 52 54 56 5860626,{ 66 68 70 72
Timo (houB)
Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 100 year Rainfall=7.38"
Prepared by {enter your company name here} Printed 112712022
HvdroCAD@ 10.00-25 s/n 00744 02019 HvdroCAD Software Solutions LLC Paoe 32
Summary for Link 3L: offsite total
lnflow Area = 8.260 ac, 33.78o/o lmpervious, lnflow Depth = 5.30" for 100 year eventlnflow = 18.76 cts @ 12.52 hrs, Volume= 3.650 af
Primary = 18.76 cfs @ '12.52 hrs, Volume= 3.650 af, Atten= 0%, Lag= g.g , n
--r--r-t
rlrrlrrr
uf
1
+
I 1
l
lnflow Area=8-260
rTr-T-TrrTrTr
+
ffi T-rT r-r-1
#tttl
I
I
t
ac
it,j
1
'ul
z
A
m
%
t'B;6-cr'
173
Memorandum
To: MacKenzie Young-Walters, Associate Planner
From: Erik Henricksen, Project Engineer
Joe Seidl, Water Resources Engineer
CC: Charles Howley, Public Works Director/City Engineer
George Bender, Assistant City Engineer
Joe Seidl, Water Resources Engineer
Charlie Burke, Public Works Operations Manager
Date: 2/18/2022
Re: 10500 and 10520 Great Plains Boulevard Conceptual PUD Review –
Planning Case No. 2022-04
EASEMENTS
The preliminary plat provided with the Conceptual PUD materials, dated 12/4/2018 and
produced by James R. Hill, Inc., illustrates typical 10 foot public drainage and utility easements
(DUE) along all property lines. Additional public DUEs will be required over public utilities
(only watermain at this phase) extended into the property as discussed under the “Sanitary Sewer
and Watermain” section of this report. The dimensions of the DUE must be adequate to
properly repair and maintain the utility; the minimum for watermains is typically 20 feet wide,
centered over the main, due to their typical installation depth of 7.5 feet, however additional
DUE may be required depending on the plans that will be provided.
Any and all existing easements must be vacated prior to recording of the final plat.
Based on Carver County property information there appears to be two parcels abutting the
preliminary plat’s western property lines that are listed as “Parcel ID: Gap”. It is unclear if these
parcels are being considered in the lot combination of the Conceptual PUD, or if they are being
considered a part of the adjacent lot to the west (PID #250361300). Clarification regarding the
status of “Parcel ID: Gap” in conjunction with the proposed plat will be required prior to
recording of the final plat from either the County or the applicant.
174
The preliminary plat abuts and gains access from Carver County right-of-way. Thus, the
applicant must coordinate with Carver County regarding any additional considerations and
potential conditions associated with easements for the property as well as any requirements
associated with ingress/egress and construction activities such as during grading and hauling
operations.
EXISTING CONDITIONS SURVEY
The existing condition survey, dated 1/28/2022 and produced by James R. Hill, Inc., will need to
be updated upon resubmittal to incorporate the following information, as necessary:
· Topographic data 100 feet beyond the property boundary
· Illustration of existing features that would impact the site’s ingress/egress (e.g. the full
extents of Flying Cloud Drive which includes the median near the site’s entrance)
· Utilities on or adjacent to the property, including location, size and invert elevation of
storm sewers, catch basins and manholes; location and size of water mains (including
casings) and hydrants; location of gas mains, high pressure lines, fire hydrants, electric
and telephone lines, and street lights. The direction, distance to, and size of such
facilities shall be indicated.
· Wetlands
· Bluff impact zones
· Sewage treatment systems and associated conveyance systems
· Existing easements and associated recording document numbers
· Property information within 150 feet of the property’s boundary
· Retaining wall elevations
WETLANDS
A study completed by Kjolhaug Environmental Services in 2021 shows there are no wetlands
within the project site. City records show there is one wetland just south of the project site located in
the drainage ditch along County Road 101 (Great Plains Blvd). This wetland has been classified as
a manage type 2 wetland in the City’s Surface Water Management Plan. A 1992 delineation report
indicates the source of water as surface water runoff and the route of outflow is a culvert to the
Minnesota River.
The preliminary plans submitted with the Conceptual PUD show grading in close proximity to
the wetland which is near the proposed access to the site. Article VI, Chapter 20 of City Code
describes buffer strip and setback requirements. For example a 10 to 30 foot buffer strip with an
average of 20 foot width for manage type 2 wetlands. There is also a 30-foot setback from the
buffer strip so the building setback should be from 40 to 60 feet averaging 50 feet away from the
175
edge of a manage type 2 wetland. The wetland buffer and wetland setback should be shown on the
grading plan and stacked in the field prior to construction. The preliminary plans appear meet the
wetland buffer and setback requirements.
BLUFFS
There is a steep slope located on the west side of the property; the bottom generally follows the
750 contour of the property and the top of the follows the 772 -774 contours. The steep area is
called out in the preliminary plans as a bluff, however because this area was created from
grading completed as part of a development project in 1996 it is not a natural slope and therefore
does not meet the City's definition of a bluff. The Lower Minnesota River Watershed District
(LMRWD) also regulates steep slopes within their jurisdiction. The applicant will need to
coordinate with the watershed district to confirm if the project triggers any regulations as defined
in Rule F – Steep Slopes.
RETAINING WALLS
Preliminary plans provided with the Conceptual PUD submittal indicate that retaining walls may
be required for the development. These walls are shown around the northern and western
portions of the property. Portions of the retaining walls illustrated are shown to be located
within public drainage and utility easements along the western property lines. An encroachment
agreement would be required for any retaining walls located within public easements.
Portions of the retaining walls are illustrated to be either close to or directly over the western
property line. Due to the proximity to the property line, the construction of these walls would
require construction activities to occur on the abutting property. The construction of any
improvements that impact or require access to abutting properties must have the appropriate
right-of-entry agreements and/or temporary construction easements prior to construction
operations commencing.
Retaining walls over 4 feet in height shall be constructed in accordance with plans prepared by a
registered engineer and shall be constructed of a durable material (smooth face concrete,
masonry/mortared, railroad ties and timber are prohibited). It should be noted that the height of
any retaining wall is measured from the top of the wall to the bottom of the footing (not to the
top of grade adjacent to the bottom of the wall).
ACCESS
Access to the site is currently had from Flying Cloud Drive (CSAH 61) and is located near the
western property line. The preliminary plans indicate that the current access will remain and no
176
additional accesses to the surrounding Carver County rights-of-way are proposed. The
development will be required to construct a commercial driveway access in accordance with City
Standards. Any comments or conditions by Carver County associated with impacts to their
rights-of-way must be adhered to and all permits required must be obtained prior to construction
activities commencing.
It appears no turnaround is provided in the preliminary plans. In accordance with Section 20-
1122 of City Code a turnaround is required when access is had from a state highway, county road
or collector roadway. As access is being had from CSAH 61 a turnaround will be required that
can adequately facilitate the turning movement of the largest anticipated design vehicle for the
site or the City’s largest fire truck, whichever is greater.
GRADING AND DRAINAGE
The existing conditions plansheet and drainage maps included in the Conceptual PUD submittal
show an existing building near the center of the property with access to Great Plains Boulevard
provide by an asphalt parking area and gravel driveway. Stormwater runoff general flows from
north to south down the slope of the site where it enters a drainage swale along Flying Cloud
Drive. The drainage swale conveys stormwater from west to east. Stormwater leaves the site by
way of an existing 48” culvert under Flying Cloud Drive which conveys the stormwater to the
South through Bluff Creek and ultimately outleting to the Minnesota River.
The preliminary plans provided with the Conceptual PUD submittal show a significant amount
of grading. The design steepens the hill on the northeast side of the site to create a flat area
conducive for the four proposed buildings with access and parking. The proposed design uses
combination of drainage swales and stormwater infrastructure to collect and convey stormwater
into a Best Management Practice (BMP) located on the southwest corner of the property. The
design shows stormwater being conveyed from the proposed BMP to the existing swale along
Flying Cloud Blvd through an outlet control structure. Any impacts to Carver County’s right-of-
way must be approved and permitted by the County prior to construction activities. The overall
design of the stormwater infrastructure mimics the flow path of the existing condition and acts to
convey stormwater runoff from impervious surfaces through water quality BMPS. A more
detailed analysis of stormwater volumes and rates may be required to show the wetland onsite is
not negatively impacted by the proposed design.
EROSION PREVENTION AND SEDIMENT CONTROL
177
The proposed development will exceed one (1) acre of disturbance and will, therefore, be subject
to the General Permit Authorization to Discharge Stormwater Associated with Construction
Activity Under the National Pollution Discharge Elimination/State Disposal System (NPDES
Construction Permit). The applicant has prepared and submitted a preliminary Surface Water
Pollution Prevention Plan (SWPPP) and generally appears feasible. The SWPPP is a required
submittal element for preliminary plat review. No earth disturbing activities may occur until an
approved SWPPP is developed. This SWPPP shall be a standalone document consistent with the
NPDES Construction Permit and shall contain all required elements as listed in Parts III and IV
of the permit. The SWPPP will need to be updated as the plans are finalized, when the
contractor and their sub-contractors are identified and as other conditions change.
SANITARY SEWER AND WATERMAIN
Currently, municipal sanitary sewer and potable water services are not available to the site.
During the build-out of the Highway 101 Realignment project, which was substantially
completed in 2021, public sanitary sewer mains and water mains were extended along the
corridor. However, these newly extended utilities are not fully active nor ready for operation to
service properties, as such the site does not have adequate public sanitary and water to fully
serve the development’s needs.
In 2014, a Highway 61 corridor study was conducted in response to several near and long-term
infrastructure projects at the time (e.g. Highway 101 Realignment, CSAH 61 reconstruction,
flood mitigation projects, etc.) which prompted the City to investigate the feasibility of extending
public utilities to the southern portion of the City. The study, known as “County Road 61
Corridor Plan”, conducted by SRF in association with Hoisington Koegler Group, Inc.,
determined that utility extensions were feasible within the study area. The image below, taken
from Figure 3.1 of the City’s 2040 Comprehensive Plan, depicts the City’s existing and planned
sanitary sewer in this area (planned water system build-out generally adheres to the same areas
and alignments).
178
The proposed development falls within the southcentral region of sanitary subdistrict LB-1 (the
Lower Bluff Creek District). The 2014 study estimated costs and fee revenue associated with
extending City utilities to the study area, along with estimated utility assessments per acre, which
are shown in Tables 1 and 2.
179
With a lack of adequate city utilities in the area, the development will be required to provide
private utility services (sanitary sewer and potable water) to adequately meet the needs of the
development. The City has preliminarily agreed to allow the development to tap into the public
watermain which was extended with the Highway 101 Realignment project, but only to service
the development’s fire suppression needs. At this time there is not sufficient demand along the
extended watermain to supply water to the quality standards that the City requires for
consumption. This is important to note because the preliminary plans provided indicate the
existing well on-site is proposed to be abandoned. If the site will have any fixtures requiring the
use of water other than for fire suppression needs, a private source of water supply must be used
for those fixtures.
The preliminary plans indicate tapping of the existing public watermain for fire suppression
needs at the southwest corner of the property. As shown on the preliminary plans this would be
infeasible as the watermain was housed in a casing at the location, and would be required to be
extended further west to facilitate the connection. Regardless, the development will be required
to extend the public watermain to the western property line, and the extension into the site must
be along or near the improved private access to allow for reasonable access for future repair and
maintenance. Adequate public drainage and utility easements will be required over the public
main as it extends into the site. Private fire laterals can then be tapped from the public main as
necessary.
The property and potential future properties associated with this developable area will be
specially assessed for the extension of the public sanitary sewer when they connect.
STORM WATER MANAGEMENT
The project site is located within the Lower Minnesota River Watershed District (LMRWD). The
LMRWD is the LGU that administers NPDES Construction Permits for stormwater
management. The proposed development will exceed the one (1) acre of new impervious area
and will therefore require permanent stormwater BMPs to be constructed as part of this project
180
and maintained by the owner. The project will be subject to stormwater regulations outlined
under LMRWD Rule D including rate, volume, and water quality.
The City of Chanhassen also regulates the design, construction, and maintenance of stormwater
infrastructure. Article VII, Chapter 19 of City Code describes the required storm water
management development standards. Section 19-141 states that “these development standards
shall be reflected in plans prepared by developers and/or project proposers in the design and
layout of site plans, subdivisions and water management features.” A stormwater maintenance
agreement and associated operations and maintenance plan is required for all private stormwater
BMPs.
Preliminary plans provided with the Conceptual PUD submittal show stormwater treatment and
rate control from a wet pond with an incorporated filtration bench BMP located on the southwest
corner of the property. The stormwater BMP appears to be properly sized for the impervious
surface proposed in the plans. The design of the BMP is highly dependent on soil types and
infiltration rates of the underlying soils. Soil borings, infiltration testing and an associated
geotechnical report will be needed to confirm the design of the stormwater BMP. No
geotechnical report was included as part of the Conceptual PUD submittal.
The City’s water resources engineer reviewed the preliminary plans provided with the
Conceptual PUD. Specific comments regarding the design of stormwater infrastructure and
BMPs were provided to the applicant.
STORM WATER MANAGEMENT FEES
In 2005 a Stipulation of Settlement (Court File No. 10-CV-05-48) between PCH Development,
LLC and the City of Chanhassen was agreed to regarding the park dedication fees and surface
water management fees surrounding the subdivision of the “Paws Claws and Hooves Addition”
subdivision (PC #2003-04 and the property of this Conceptual PUD). The surface water
management fee was reduced to $9,900.00 and was paid on 7/25/2005. The settlement
agreement states, “If all or any part of the property is changed to a different principal use or
further subdivided, the property shall be subject to payment of additional park dedication and
surface water management fees based upon the rates in effect at that time applicable to the
proposed use and type of municipal approval requested.” However, as the stipulation was
between the property owner and the City and was not required to be memorialized against the
property, if the property owner changes from PCH Development, LLC no stormwater fees will
be required if the PUD is approved. If the property is subdivided in the future, stormwater fees
will be collected at the rate in affect at the time of platting, minus the $9,900.00 already paid.
181
Landscaping and Tree Preservation
10500/10520 Great Plains Blvd
A Planned Unit Development (PUD) is expected to ‘protect.. mature trees…” and ‘reflect higher quality
design of…landscaping’. The proposed development site has existing trees as evidenced in a field
inspection and shown in current aerial mapping applications. The existing trees and woods are not
included on the Existing Conditions sheets, nor reflected in the submitted Canopy Coverage calculations
shown on the Landscape Plan. It is unknown if any of the existing trees will be preserved, but it appears
that there may be some in part of the ‘undisturbed area’ shown on the plan that may possibly be
unaffected by site grading. The applicant will need to submit a tree inventory for the site as well as
update the canopy coverage calculations. Based on the calculations, the applicant will need to meet and
potentially exceed the minimum requirements for replacement tree planting on the site. Staff
recommends that the applicant consider using a no-mow turf grass or prairie mix in place of the
proposed sod areas to promote a sustainable landscape design for the site.
A site plan review for the site will be required to show foundation plantings on the outward facing sides
of the buildings. Bufferyard plantings are required along the property lines. The landscape plan shows
the following proposed landscaping for the site.
Required plantings Proposed plantings
Bufferyard B –North
prop. line, Regional
Trail, 780’
15 overstory trees
31 Understory trees
46 Shrubs
1 overstory trees
4 Understory trees
46 Shrubs
Bufferyard C –South
prop. Line, Hwy 61, 700’
21 overstory trees
42 understory trees
63 shrubs
6 overstory trees
0 understory trees
0 shrubs
Bufferyard C –west
prop. line, Hwy 101
Great Plains Blvd, 500’
15 Overstory trees
30 Understory trees
45 Shrubs
3 Overstory trees
3 Understory trees
0 Shrubs
Bufferyard C -East
property line, 460’
10 Overstory trees
20 Understory trees
31 Shrubs
2 Overstory trees
0 Understory trees
0 Shrubs
The applicant does not meet minimum requirements for bufferyard plantings on the site.
182
The vehicular use area is required by code to have landscaping that includes islands or peninsulas for
every 6,000 sq. ft. of use area and landscape areas and a minimum number of trees in and around the
parking area in order to reduce the overall heat island effect of pavement and improve aesthetics of the
site. Minimum requirements for landscaping for the parking lot include 2,816 sq. ft. of landscaped area
around the parking lot, 5 landscape islands or peninsulas, and 11 trees for the parking lot. The
applicant’s proposed as compared to the requirements for landscape area and parking lot trees is shown
in the following table.
Required Proposed
Vehicular use landscape
area
2,816 sq. ft.0 sq. ft.
Trees/parking lot 11 trees 0 trees
Landscape islands or
peninsulas/parking lot
5 islands/peninsulas 0 islands/peninsulas
The landscaping as proposed in the concept plan does not meet minimum requirements for trees,
landscaping or islands/peninsulas. Acknowledging that the standard requirements for trees and
landscape islands within the paved area may prove difficult to incorporate into the site, staff
recommends that the applicant propose alternatives that also provide environmental benefits and/or
reduction in the heat island effect caused by large expanses of asphalt.
183
CITY OF CHANHASSEN
AFFIDAVIT OF MAILING NOTICE
STATE OF MINNESOTA)
ss.
COUNTY OF CARVER )
I. Kim T. Meuwissen, being first duly sworn, on oath deposes that she is and was on
February 17, 2022, the duly qualified and acting City Clerk of the City of Chanhassen,
Minnesota;that on said date she caused to be mailed a copy of the attached notice of Consider a
request for Conceptual PUD approval for a mixed-use Planned Unit Development(PUD)
which would permit the construction of four 20,000 square-foot storage buildings on
approximately 8.3 acres with a land use designation of Mixed located at 10500 and 10520
Great Plains Boulevard. Zoned: Fringe Business District. Property Owner: Nancy Blood/
Applicant: RSI Marine to the persons named on attached Exhibit"A",by enclosing a copy of
said notice in an envelope addressed to such owner, and depositing the envelopes addressed to all
such owners in the United States mail with postage fully prepaid thereon;that the names and
addresses of such owners were those appearing as such by the records of the County Treasurer,
Carver County,Minnesota, and by other appropriate records.
Li)Z/l.A 04/\'
Kim ssen, City C erk
Subscribed and s rn to before me
this 1 fir.
day of 't-6(1-k-4 , 2022.
Notary Public
184
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Disclaimer
This map is neither a legally recorded map nor a survey and is not intended to be used
as one.This map is a compilation of records,information and data located in various city,
county,state and federal offices and other sources regarding the area shown,and is to
be used for reference purposes only. The City does not warrant that the Geographic
Information System(GIS)Data used to prepare this map are error free,and the City does
not represent that the GIS Data can be used for navigational, tracking or any other
purpose requiring exacting measurement of distance or direction or precision in the TAX NAMED
depiction of geographic features. The preceding disclaimer is provided pursuant to
TAX ADD L1»Minnesota Statutes§466.03, Subd. 21 (2000), and the user of this map acknowledges
that the City shall not be liable for any damages,and expressly waives all claims,and TAX ADD L2»
agrees to defend,indemnify,and hold harmless the City from any and all claims brought
by User,its employees or agents,or third parties which arise out of the user's access or
use of data provided.
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Disclaimer
This map is neither a legally recorded map nor a survey and is not intended to be used
as one.This map is a compilation of records,information and data located in various city,
county,state and federal offices and other sources regarding the area shown,and is to
be used for reference purposes only. The City does not warrant that the Geographic
Information System(GIS)Data used to prepare this map are error free,and the City does
not represent that the GIS Data can be used for navigational, tracking or any other
purpose requiring exacting measurement of distance or direction or precision in the
depiction of geographic features. The preceding disclaimer is provided pursuant to
Minnesota Statutes§466.03,Subd. 21 (2000),and the user of this map acknowledges
that the City shall not be liable for any damages, and expressly waives all claims, and
agrees to defend,indemnify,and hold harmless the City from any and all claims brought
Next Record»«TAX NAME»by User,its employees or agents,or third parties which arise out of the user's access or
use of data provided. TAX_ADD_LID
TAX ADD L2»
185
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