Glaccum Highlands Full SWPPP Document 8-14-15 - Draft
Glaccum
Highlands
SWPPP
Storm Water Pollution Prevention Plan
Chanhassen, MN
DRAFT DOCUMENT (in development)
Prepared For:
Estate Development Corporation
15250 Wayzata Boulevard, Suite 101
Wayzata, MN
Prepared By:
Alliant Engineering, Inc.
233 Park Avenue South, Suite 300
Minneapolis, MN 55415
Mass Grading, Street and Utility
Construction
August 14, 2015
STORM WATER POLLUTION PREVENTION PLAN (SWPPP)
GLACCUM HIGHLANDS
MASS GRADING, STREET AND UTILITY CONSTRUCTION
CITY OF CHANHASSEN
CARVER, MINNESOTA
August 14, 2015
Plans and Specifications Prepared for:
Estate Development Corporation
15250 Wayzata Boulevard, Suite 101
Wayzata, MN
I hereby certify that this plan, specification or
report was prepared by me or under my direct
supervision and that I am a duly Registered
Professional Engineer under State of
Minnesota Statutes Sections 326.02 to
326.16.
Mark Rausch, P.E.
Date: 8-14-2015 Reg. No: 43480
GENERAL INDEX
I. Title Sheet
II. Signature Page
III. MPCA Coverage Card
IV. MPCA Coverage Letter
V. MPCA Permit Application
VI. SWPPP Narrative
VII. Grading, Drainage, & Erosion Control Plan Sheets
VIII. Storm Water Management Study
IX. Geotechnical Report
X. Inspection Logs
INSERT MPCA
COVERAGE CARD
HERE
INSERT MPCA
COVERAGE LETTER
HERE
INSERT MPCA
PERMIT APPLICATION
HERE
Page 1 of 8
SWPPP Narrative
Stormwater Pollution Prevention Plan (SWPPP)
I. General Construction Activity Information
a. Project name: Glaccum Highlands
b. Describe the construction project location (address/city or township/county/latitude/longitude):
Address or describe area: 1510 Lake Lucy Road
City or Township: Chanhassen State: MN Zip code: 55331
Latitude/Longitude of approximate centroid of project: 45.035369N, -93.48122W
c. Describe the construction activity (type of construction, phases, timelines, potential for discharge of sediment
and other pollutants, etc.):
• This +/-3.1 acre project site will consist of the mass grading, street, and utility construction for 4 single
family homes. This project will be mass graded in 1 phase, with street and utility construction coming in one
subsequent phase. Home construction will also be covered under the SWPPP by the home builder.
• Soil disturbing activities will include: the installation of a rock construction entrance, clearing and grubbing,
the installation of silt fence and tree fence prior to grading, clearing & grubbing, grading, excavation, retaining
wall construction, re-spreading topsoil, and grading restoration which will consist of seeding and mulching all
disturbed areas outside of the street row. Multiple erosion and sediment control BMP’s are planned to
contain the construction stormwater. See the Erosion & Sediment Control Plan for specific locations.
Project type: (To check the checkboxes, ‘double click’ the box and select “checked” and select “okay”.)
Residential Commercial/Industrial Road construction
Residential and road construction Other (describe):
d. Number total of acres to be disturbed: 1.9 (tenths of an acre)
e. Pre-construction acres of impervious surface: 0.35 (tenths of an acre)
f. Post-construction acres of impervious surface: 0.92 (tenths of an acre)
g. Total new impervious surface acres: 0.57 (tenths of an acre)
(Examples of impervious surface include rooftops, sidewalks, patios, driveways, parking lots, storage areas, and concrete, asphalt, or
gravel roads.)
II. Receiving Waters
a. List all waters within one mile (nearest straight line distance) that are likely to receive stormwater runoff from
the project site both during or after construction:
Receiving waters within one mile of project property edge:
Water body ID* Name of water body
Type
(ditch, pond, wetland,
calcareous fen, lake,
stream, river)
Special water?
(See Stormwater Permit
Appendix A)
Impaired Water?**
(See Stormwater Permit
Appendix A)
Landlocked wetland wetland Yes No Yes No
Yes No Yes No
* Water Body identification (ID) might not be available for all water bodies. Use the Special and Impaired Waters Search Tool at:
http://www.pca.state.mn.us/water/stormwater/stormwater-c.html.
** Impaired water for the following pollutant(s) or stressor(s): phosphorus, turbidity, dissolved oxygen, or biotic impairment.
b. Use the Special and Impaired Waters Search Tool to locate special and impaired waters at
http://www.pca.state.mn.us/wfhya5b).
No Special or Impaired Waters located within 1 mile of site.
c. Incorporate into this SWPPP any additional Best Management Practices (BMPs) or other specific construction
Page 2 of 8
related implementation activities identified in an approved Total Maximum Daily Load and Waste Load
Allocations.
No Special or Impaired Waters located within 1 mile of site.
d. Identify adjacent public waters where the Minnesota Department of Natural Resources (DNR) has declared
“work in water restrictions” during fish spawning timeframes:
Not Applicable
e. Attach maps (U.S. Geologic Survey 7.5 minute quadrangle, National Wetland Inventory maps or equivalent)
showing the location and type of all receiving waters, including wetlands, drainage ditches, stormwater ponds
or basins, etc. that will receive runoff from the project. Use arrows showing the direction of flow and distance to
the water body.
See Attached Map.
f. Identify wetland impacts:
1. Will construction result in any potential adverse impacts to wetlands, including excavation, degradation of water
quality, draining, filling, permanent inundation or flooding, conversion to a stormwater pond? Yes No
2. If yes, describe impacts and mitigation measures that were taken to address the impacts (in accordance with Part D
of Appendix A of the permit) and attach to this SWPPP, copies of permits or approvals from an official state wide
wetland program issued specifically for this project or site:
g. Describe any stormwater mitigation measures that will be implemented, as a result of an environmental review,
endangered or threatened species review or archeological site review:
This site was not subject to any environmental or archeological reviews.
h. Describe any additional (or different) stormwater management measures required for karst or drinking water
supply management areas to protect groundwater standards:
Not Applicable
III. Project Plans and Specifications
a. Attach to this SWPPP site maps and/or plan sheets that depict the following features:
• The project location and construction limits.
• Existing and final grades, including dividing lines and direction of flow for all pre and post-construction
stormwater runoff drainage areas located within the project limits.
• Soil types at the site.
• Locations of impervious surfaces.
• Locations of areas not to be disturbed (e.g., buffer zones, wetlands, etc.).
• Steep slope locations.
• Locations of areas where construction will be phased to minimize duration of exposed soils.
• Portions of the site that drain to a public water with DNR work in water restrictions for fish spawning timeframes.
• Locations of all temporary and permanent erosion and sediment control BMPs as required in Part III. C & D.
and Part IV of the permit.
• Buffer zones as required in Part IV.C.9 or Appendix A, Part C.3. of the permit.
• Locations of potential pollution-generating activities identified in Part IV. F. of the permit.
• Standard details for erosion and sediment control BMPs to be installed at the site.
b. List all anticipated erosion prevention and sediment control BMP quantities needed for the life of the project
(e.g., linear ft. silt fence, square feet erosion blanket, tons mulch, etc.):
Silt Fence – 1,519 LF
Erosion Control Blanket – 1,917SY
Inlet Protection – 3 EA
Bio Rolls – as needed (246 LF possible behind curb)
Rock Construction Entrance – 1 EA
Seed/Mulch – 1.5 Acres at prescribed rates.
Page 3 of 8
IV. Temporary Erosion Prevention Practices
a. Describe the types of temporary erosion prevention BMPs expected to be implemented on this site during
construction:
1. Methods of temporarily stabilizing soils and soil stockpiles (e.g., mulches, hydraulic tackifiers, erosion
blankets, etc.):
Erosion Control Blanket - This blanket shall be installed as indicated on the erosion and sediment
control plan. It will provide slope protection until the turf is established. For retaining wall construction
the grading contractor will install woodfiber blanket on the temporary 1:1 slopes until the wall
construction can be completed, if there is a delay in the construction schedule.
Seeding Restoration - Temporary/Permanent Stabilization (Seeding and Mulching) – Temporary
seeding and mulch must be placed as soon as practical, but no longer than the end of the next
business day, on all disturbed soil when grading activities will cease for longer than 14 days. See plan
notes for seeding scheduling.
2. Methods of dissipating velocity along stormwater conveyance channels and at channel outlets (e.g., check
dams, sediment traps, rip rap, etc.):
Rip-Rap – Rip Rap shall be utilized at all pond inlets and around outlet control devices.
3. Methods to be used for stabilization of ditch and swale wetted perimeters (Note that mulch, hydraulic soil
tackifiers, hydromulches, etc. are not acceptable soil stabilization methods for any part of a drainage ditch
or swale):
Bio Rolls – Bio Rolls shall be utilized in concentrated ditch and swales to control velocities and contain
sediment during construction until vegetation is established.
Erosion Control Blanket – Erosion Control Blanket shall be utilized in ditch and swale areas to provide
protection until permanent turf is established.
4. Methods to be used for energy dissipation at pipe outlets (e.g., rip rap, splash pads, gabions, etc.):
Rip-Rap – Rip Rap shall be utilized at all pond inlets and around outlet control devices.
5. Methods to be used to promote infiltration and sediment removal on the site prior to offsite discharge,
unless infeasible (e.g., direct stormwater flow to vegetated areas):
Temp Sedimentation Basins – Temporary Sedimentation Basins shall be used to protect downstream
waters prior to discharge. A floating skimmer shall drain the basins from the water level in order to
prevent the discharge of suspended sediment.
b. Describe timelines to be implemented at this site for completing the installation of the erosion prevention BMPs
listed in i, ii, iii, and iv. (see Part IV. B. of the permit for minimum requirements). If applicable, include the
timeline for completing soil stabilization for areas within 200 feet of a public water with work in water
restrictions due to fish spawning time frames (Part IV.B.2.) and soil stabilization timelines for portions of the site
that drain to special or impaired waters as required in Appendix A Part C. 1.a.:
1. Prior to any construction or demolition, silt fence and inlet filters shall be installed as shown to
intercept runoff.
2. All erosion control installations shall remain in place and be maintained in good condition by
the contractor until the site has been re-vegetated. Contractor may remove necessary silt
fencing/filters to construct roadways, while maintaining adequate erosion control in adjacent
area.
3. Sufficient topsoil shall be stockpiled to allow for the replacement of 6" of topsoil for disturbed
areas to be re-vegetated.
4. The contractor shall schedule site grading, utility installation and pavement construction so
that the general site can be mulched and re-seeded soon after disturbance. Areas that will not
be subject to construction traffic for 7 days or longer shall be seeded and mulched or sodded
as soon as practical but not later than the following end of business day.
5. Contractor shall install erosion control devices as indicated on this erosion control plan and
any additional required based on means, methods and sequences of construction.
c. Describe additional erosion prevention measures that will be implemented at the site during construction (e.g.,
construction phasing, minimizing soil disturbance, vegetative buffers, horizontal slope grading, slope
draining/terracing, etc.):
Not Applicable.
Page 4 of 8
d. If applicable, include additional requirements in Appendix A Part C.3 regarding maintaining a 100-foot buffer
zone or installing redundant BMPs for portions of the site that drain to special waters:
Not Applicable.
e. If applicable, describe additional erosion prevention BMPs to be implemented at the site to protect planned
infiltration areas:
Not applicable, the site will utilize extended stormwater detention, evapotranspiration, and excess NURP
volume to meet volume reduction requirements.
V. Temporary Sediment Control Practices
a. Describe the methods of sediment control BMPs to be implemented at this site during construction to minimize
sediment impacts to surface waters, including curb and gutter systems:
1. Methods to be used for down gradient perimeter control:
Silt Fence – Silt fences are designed as a temporary sediment barrier consisting of a filter fabric
attached to support posts. This site has four applications for silt fence. These applications are as
follow:
1. The installation of silt fence along the grading limits to protect the neighboring properties from
sediment during the grading and utility construction process.
2. The installation of silt fence around the created ponds after construction to control the sediment
runoff until the turf is established and the development is completed.
3. The installation of silt fence surrounding temporary stockpiles.
4. The installation of post construction silt fence to protect new roads and storm sewer
infrastructure.
2. Methods to be used to contain soil stockpiles:
Silt Fence – See Above
3. Methods to be used for storm drain inlet protection:
Storm Drain Inlet Protection – Storm drain inlet protection is a sediment barrier placed around a storm
sewer inlet. This structure traps sediment before it enters the storm sewer system. The utility contractor
will be required to install inlet protection per the City of Plymouth’s details.
4. Methods to minimize vehicle tracking at construction exits and street sweeping activities:
Temporary Rock Construction Entrance – A rock entrance berm is constructed of coarse clean rock
installed at the proposed entrance point for all construction vehicles. A detail of the rock entrance berm
is shown on the final grading plan. This stone pad provides a tire cleaning mechanism for all vehicles
leaving the site. There is one entrance for this project. Please see the Erosion & Sediment Control Plan
for location of rock entrance berm.
5. If applicable, additional sediment controls (e.g., diversion berms) to be installed to keep runoff away from
planned infiltration areas when excavated prior to final stabilization of the contributing drainage area:
Not Applicable.
6. Describe methods to be used to minimize soil compaction and preserve top soil (unless infeasible) at this
site:
Topsoil stripped from temporary building pads will be stockpiled in future building areas to prevent the
contamination of topsoil. Individual home builders will be required to respread from these stockpiles.
7. Describe plans to preserve a 50-foot natural buffer between the project’s soil disturbance and a surface
water or plans for redundant sediment controls if a buffer is infeasible:
The project was designed to preserve most of the existing wooded slope upland of the Turtle Lake
floodplain. The existing slope will be disturbed to install a shallow storm sewer and a small disturbance
will be required temporarily within the wetland to make connection to existing sanitary sewer. The
remainder of the natural buffer will remain undisturbed.
8. Describe plans for use of sedimentation treatment chemicals (e.g., polymers, flocculants, etc.) see Part
IV.C.10 of the permit:
Not Applicable
Page 5 of 8
b. Is the project required to install a temporary sediment basin due to 10 or more acres draining to a common
location or 5 acres or more if the site is within 1 mile of a special or impaired water? Yes No
If yes, describe (or attach plans ) showing how the basin will be designed and constructed in accordance with
Part III.C of the permit.
c. Will the project include dewatering, basin draining? Yes No
If yes, describe measures to be used to treat/dispose of turbid or sediment-laden water and method to prevent
erosion or scour of discharge points (see Part IV. D of the permit):
d. Will the project include use of filters for backwash water? Yes No
If yes, describe how filter backwash water will be managed on the site or properly disposed (see Part III.D.3. of
the permit):
VI. Permanent Stormwater Management System
a. Will the project result in one acre or more of new impervious surfaces or result in one acre or more of new
impervious in total if the project is part of a larger plan of development? Yes No
b. If yes, a water quality volume of one inch of runoff from the cumulative new impervious surfaces must be
retained on site (see Part III.D of the permit) through infiltration unless prohibited due to one of the reasons in
Part III.D.1.j. If infiltration is prohibited identify other method of other volume reduction (e.g., filtration system,
wet sedimentation basin, regional ponding or equivalent method:
Even though the site does not create 1 acre or more of new impervious surface, an underground
infiltration storage system is proposed to meet the requirements of the City of Chanhassen and the
Minnehaha Creek Watershed WMC MS4 permits. See attached Storm Water Management Study for
complete narrative of permanent stormwater practices.
c. Attach design parameters (see Part III.D.) for the planned permanent stormwater management system, including
volume calculations, discharge rate calculation, construction details including basin depth, outlet
configurations, location, design of pre-treatment devices and timing for installation. For more design
information consult the Minnesota Stormwater Manual on the MPCA website at
http://stormwater.pca.state.mn.us/index.php/Main_Page.
See attached Storm Water Management Study.
d. For infiltration systems attach on site soil testing results verifying soil type and distance to the seasonal water
table or bedrock (from bottom of the basin) in the location of the infiltration or filtration system.
See attached Geotechnical Study.
e. For linear projects with lack of right of way to install treatment systems capable of treating the entire water
quality volume, identify other method(s) for providing treatment of runoff prior to discharge to surface waters
(e.g., grassed swales, filtration systems, smaller ponds or grit chambers, etc.):
Not Applicable
1. Attach to this SWPPP documentation of reasonable attempts made to obtain right of way for stormwater
treatment systems.
f. For projects that discharge to trout streams, including tributaries to trout streams, identify method of
incorporating temperature controls into the permanent stormwater management system:
Not Applicable.
VII. Inspection and Maintenance Activities
a. Identify the trained individual(s) responsible for designing, installing, supervising, repairing, inspecting, and
maintaining erosion prevention and sediment control BMPs at the site:
SWPPP Designer (Training Documentation Attached):
Dave Modrow, PE
Alliant Engineering, Inc.
612-501-8795
SWPPP Inspector (Training Documentation Attached):
Contractor to complete this section to include person(s) responsible for installation and maintenance.
Page 6 of 8
b. Attach training documentation for each individual:
Training Documents Attached. Contractor to include other parties listed in VII-a.
c. Areas to be inspected and maintained (see Part IV.E.5. and 6. of the permit):
1. Inspect silt fences immediately after each rainfall and at least daily during prolonged rainfall.
Immediately repair failed or failing silt fence.
2. Replacement - fabric shall be replaced promptly when it decomposes or becomes ineffective before
the barrier is no longer necessary.
3. Sediment removal - Sediment deposits should be inspected after each storm event. They must be
removed when deposits reach approximately one-third the height of the barrier. Any sediment remaining
in place after the silt fence or filter fabric is no longer required shall be dressed to conform with existing
grade, prepared, and seeded with the appropriate seed mix, or sodded as directed by the engineer.
4. Removal of silt fence - silt fences shall be removed when they have served their useful purpose, but
not before the upward sloping area has been permanently stabilized. If the upward sloping area is to be
exposed longer than six (6) months, that area shall be covered with temporary vegetation when first
exposed.
5. The contractor must routinely inspect the construction site once every seven (7) days during active
construction and within 24 hours after a rainfall event greater than 0.5 inches in 24 hours.
6. All inspections and maintenance conducted during construction must be recorded in writing and
these records must be retained with the SWPPP records of each inspection and maintenance activity
shall include:
A. Date and time of inspections;
B. Name of person(s) conducting inspections;
C. Findings of inspections, including recommendations for corrective actions;
d. Corrective actions taken (including dates, times, and party completing maintenance
activies.
e. Date and amount of all rainfall events greater than 1/2 inch (0.5 inches) in 24 hours:
f. Documents of changes made to the SWPPP as required in part iii.a.4.
7. Where parts of the construction site have undergone final stabilization, but work remains on other
parts of site, inspections of the stabilized areas may be reduced to once per month. Where work has
been suspended due to frozen ground conditions, the required inspections and maintenance must take
place as soon as runoff occurs at the site or prior to resuming construction, whichever comes first.
VIII. Pollution Prevention Management Measures
a. Describe practices for storage of building products with a potential to leach pollutants to minimize exposure to
stormwater:
All trash and construction debris from the site will be collected and deposited in a dumpster. A dumpster
will be required for each new home constructed. The dumpsters shall be emptied as necessary. No
construction materials shall be buried on site. All solid waste must be disposed if of in accordance with
the MPCA disposal requirements
b. Describe practices for storage of pesticides, herbicides, insecticides, fertilizers, treatment chemical, and
landscape materials:
Pesticides, Fertilizers, etc. will be applied only in the minimum amounts as recommended by the
manufacturer. Once applied, the potential pollutions will be worked into the soil to limit the exposure to
stormwater.
c. Describe practices for storage and disposal of hazardous materials or toxic waste (e.g., oil, fuel, hydraulic
fluids, paint solvents, petroleum-based products, wood preservative, additives, curing compounds, and acids)
according to Minn. R. ch. 7045, including restricted access and secondary containment:
• All hazardous materials like oil, gasoline and paint must be properly stored. To prevent spills
and leaks, secondary containment is necessary for hazardous materials.
Page 7 of 8
• A leak proof containment facility shall be used for fuel storage tanks to prevent any leakage from
infiltrating the ground.
• An effort will be made to store only enough products to do the required job.
• All materials stored on site will be stored in a neat and orderly manner.
• All products will be kept in their original container, with the original labels still attached, unless
they are not re-sealable.
• Substances will not be mixed with one another unless recommended by the manufacturer.
• Whenever possible all of a product will be used up before disposing of a container.
• Manufacturers’ recommendations for proper disposal will be followed.
• The site superintendent will routinely inspect the site to ensure proper disposal of all on site
materials.
d. Describe collection, storage and disposal of solid waste in compliance with Minn. R. ch. 7035:
All trash and construction debris from the site will be collected and deposited in a dumpster. A dumpster
will be required for each new home constructed. The dumpsters shall be emptied as necessary. No
construction materials shall be buried on site. All solid waste must be disposed if of in accordance with
the MPCA disposal requirements.
e. Describe management of portable toilets to prevent tipping and disposal of sanitary wastes in accordance with
Minn. R. ch. 7040:
Portable Toilets must be in accordance with the above referenced standard.
f. Describe spill prevention and response for fueling and equipment or vehicle maintenance:
The following materials and/or substances are expected to be present onsite during construction-
Fertilizers, Petroleum Based Products,Cleaning Solvents, Detergents, Adhesive Solvents, Wood,
Masonry Block, Concrete, Roofing shingles, Caulking, Metal Studs, Paints/Stains, Chlorine, Asphalt
Tack, Bituminous Paving Products
Product Specific Practices –
Petroleum Products: All onsite vehicles and equipment will be monitored for leaks and receive regular
preventative maintenance to reduce the chance of leakage. Petroleum products will be stored in a
tightly sealed container, which is clearly labeled. Any asphalt substances used onsite will be applied
according to the manufacturer’s recommendations.
Fertilizers: Fertilizers will be applied only in the minimum amounts as recommended by the
manufacturer. Once applied, the fertilizer will be worked into the soil to limit the exposure to stormwater.
Paints: All containers will be tightly sealed and stored when not required for use. Excess paint will not
be discharged into the storm sewer system, but will be properly disposed of in accordance with local
regulations.
Concrete Trucks: Will only be allowed to wash out in designated discharge areas.
Spill Control Practices –
• All spills will be cleaned up immediately after discovery, in accordance with the manufacturer’s
recommended methods.
• The spill area will be kept well ventilated.
• Spills of toxic or hazardous materials must be reported to the Minnesota Duty Officer 1-800-422-0798.
• A log of the spill type, location, date, and time will be created by the job superintendent. The spill
prevention plan will be adjusted to include measures to prevent this type of spill from reoccurring.
g. Describe containment and disposal of vehicle and equipment wash water and prohibiting engine degreasing on
the site:
External washing of trucks and other construction vehicles must be limited to a defined area of the site.
Runoff must be contained and waste properly disposed of. No engine degreasing is allowed on site.
h. Describe storage and disposal of concrete and other washout wastes so that wastes do not contact the ground:
A leak proof containment facility shall be used for all liquid and solid wastes generated by concrete
washout operations. Liquid and solid wastes shall not come in contact with the ground and must be
disposed of in accordance with the MPCA.
Page 8 of 8
IX. Final Stabilization
a. Describe method of final stabilization (permanent cover) of all disturbed areas:
All areas disturbed by construction shall be stabilized from erosion as soon as possible
and not later than the end of the next business day following substantial completion of
grading in that area. Temporary or permanent seed and mulch shall cover all exposed
soils if grading completion is delayed longer than 14 days.
General temporary seed shall be mndot mix 190 @ 100 lbs. Per acre or approved equal.
Permanent seed shall be mndot mix 270 @ 120 lbs. Per acre or approved equal. (planting
dates per spec 2575) mulch shall be mndot type 1 (clean oat straw) @ 2 tons per acre
and disk anchored in place or approved equal. Fertilizer shall be 80-80-80 npk per acre
(unless P restrictions apply) and incorporated into the seed bed.
Pond areas shall be seeded with MNDOT Mix 310 @ 82lbs acre and wetland buffers shall
be seeded with BWSR Mix U7 @ 15 lbs. Per acre also be covered with type 3 mulch.
All temporary erosion and sediment control measures shall be properly disposed of within
thirty (30) days after final site stabilization is achieved or after the temporary measures are
no longer needed.
b. Describe procedures for completing final stabilization and terminating permit coverage (see Part IV.G.1-5):
The contractor must ensure final stabilization of the site. The contractor must submit a
notice of termination (NOT) within 30 days after final stabilization is complete, or another
owner/operator (permittee) has assumed control of all areas of the site that have not
undergone final stabilization. Final Stabilization can be achieved when:
All soil disturbing activities at the site have been completed and all soils must be stabilized
by a uniform perennial vegetative cover with a density of 70 percent over the entire
pervious surface area, or other equivalent means necessary to prevent soil failure under
erosive conditions and;
a. All drainage ditches, constructed to drain water from the site after construction is
complete, must be stabilized to preclude erosion;
b. All temporary synthetic, and structural erosion prevention and sediment control bmps
(such as silt fence) must be removed as part of the site final stabilization; and
c. The contractors must clean out all sediment from conveyances and from temporary
sedimentation basins that are to be used as permanent water quality management
basins. Sediment must be stabilized to prevent it from being washed back into the
basin, conveyances or drainage ways discharging off-site or to surface waters. The
clean out of permanent basins must be sufficient to return the basin to design capacity.
Documentation of infeasibility:
YOSEMITE AVE.LAKE LUCY ROADLAKEWAY DR.1 3 4BLOCK 1LAKEWAYCOURT
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LICENSE NO.DATE MARK RAUSCH, PE I HEREBY CERTIFY THAT THIS PLAN,SPECIFICATION, OR REPORT WASPREPARED BY ME OR UNDER MYDIRECT SUPERVISION AND THAT IAM A DULY LICENSEDUNDERTHE LAWS OF THE STATE OF MINNESOTA
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233 Park Ave S, Ste 300Minneapolis, MN 55415612.758.3080 612.758.3099www.alliant-inc.com MAINFAX15250 WAYZATA BOULEVARDSUITE 101WAYZATA, MN 55391PHONE (612) 990-0666 EDCEDC
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