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KEY NOTES
<br />OROCK
<br />CONSTRUCTION ENTRANCE,
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<br />INLET PROTECTION,
<br />SEE DETAIL VC501
<br />SEE DETAIL 4/C501
<br />OSILT
<br />FENCE,
<br />O
<br />POND/BASIN PROTECTION
<br />SEE DETAIL 2/C501
<br />SILT FENCE, SEE DETAIL 2/C501
<br />ORIP
<br />RAP WIER OVERFLOW,
<br />SEE DETAIL 3/C501
<br />OEROSION
<br />CONTROL BLANKET,
<br />SEE DETAIL 8/C500
<br />100-YR HWL = 906.99
<br />BOT = 904.00
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<br />GRADING NOTES
<br />1. Tree protection consisting of snow fence or safety fence installed at the drip line shall be in place prior to beginning any
<br />grading or demolition work at the site.
<br />2. All elevations with an asterisk (*) shall be field verified. If elevations vary significantly, notify the Engineer for further
<br />instructions.
<br />3. Grades shown in paved areas represent finish elevation.
<br />4. Restore all disturbed areas with 5" of good quality topsoil and seed.
<br />5. All construction shall be performed in accordance with state and local standard specifications for construction.
<br />7. At the completion of the project and prior to turf establishment and seeding, the Contractor shall de -compact the soils in areas
<br />that were disturbed as a result of construction activities. De -compaction shall consist of ripping, cultivating, or scarifying the
<br />top 12" in an attempt to improve the infiltration characteristics of the soils. The Contractor shall use low impact earth moving
<br />equipment to prevent compaction of the underlying soils, for both temporary and final grading and smoothing of the topsoil
<br />prior to seeding.
<br />8. Infiltration areas to be marked off and protected from compaction. Only tracked and low impact equipment allowed in bottom
<br />of basin. If compaction does occur, soils shall be scarified to a depth of 18".
<br />9. All sidewalks shall be constructed with a cross slope not to exceed 2%. Maximum 2% slope to be maintained through
<br />driveway.
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<br />SYMBOL LEGEND
<br />- - - - - - - 950- - - - - - -
<br />EXISTING CONTOURS
<br />950
<br />PROPOSED CONTOURS - MAJOR INTERVAL
<br />949
<br />PROPOSED CONTOURS - MINOR INTERVAL
<br />- - - - - - - - - - - - - - - - -
<br />GRADE BREAK LINE
<br />GRADE SLOPE
<br />SILT FENCE
<br />UOUU0000000
<br />RIP -RAP / ROCK CONST. ENTRANCE
<br />0000
<br />OE -
<br />EROSION CONTROL BLANKET
<br />INLET PROTECTION
<br />EROSION CONTROL NOTES
<br />SPOT ABBREVIATIONS:
<br />950.00 TC TC - TOP OF CURB
<br />949.50 GL GL - GUTTER LINE
<br />B - BITUMINOUS
<br />C - CONCRETE
<br />G-GROUND
<br />EOF - EMERGENCY OVERFLOW
<br />LP - LOW POINT
<br />HP - HIGH POINT
<br />(*) - EXISTING TO BE VERIFIED
<br />1. Owner and Contractor shall obtain MPCA-NPDES permit. Contractor shall be responsible for all fees pertaining to this permit. The SWPPP
<br />shall be kept onsite at all times.
<br />2. Install temporary erosion control measures (inlet protection, silt fence, and rock construction entrances) prior to beginning any excavation or
<br />demolition work at the site.
<br />3. Erosion control measures shown on the erosion control plan are the absolute minimum. The contractor shall install temporary earth dikes,
<br />sediment traps or basins, additional siltation fencing, and/or disk the soil parallel to the contours as deemed necessary to further control
<br />erosion. All changes shall be recorded in the SWPPP.
<br />4. All construction site entrances shall be surfaced with crushed rock across the entire width of the entrance and from the entrance to a point 50'
<br />into the construction zone.
<br />5. The toe of the silt fence shall be trenched in a minimum of 6". The trench backfill shall be compacted with a vibratory plate compactor.
<br />6. All grading operations shall be conducted in a manner to minimize the potential for site erosion. Sediment control practices must be
<br />established on all down gradient perimeters before any up gradient land disturbing activities begin. 7
<br />7. All exposed soil areas must be stabilized as soon as possible to limit soil erosion but in no case later than 14 days after the construction Z
<br />activity in that portion of the site has temporarily or permanently ceased. Temporary stockpiles without significant silt, clay or organic O
<br />components (e.g., clean aggregate stockpiles, demolition concrete stockpiles, sand stockpiles) and the constructed base components of roads,
<br />parking lots and similar surfaces are exempt from this requirement.
<br />8. The normal wetted perimeter of any temporary or permanent drainage ditch or swale that drains water from any portion of the construction site, U
<br />or diverts water around the site, must be stabilized within 200 lineal feet from the property edge, or from the point of discharge into any surface
<br />water. Stabilization of the last 200 lineal feet must be completed within 24 hours after connecting to a surface water. Stabilization of the
<br />remaining portions of any temporary or permanent ditches or swales must be complete within 14 days after connecting to a surface water and
<br />construction in that portion of the ditch has temporarily or permanently ceased. ^
<br />9. Pipe outlets must be provided with energy dissipation within 24 hours of connection to surface water. Z
<br />10. All riprap shall be installed with a filter material or soil separation fabric and comply with the Minnesota Department of Transportation Standard O ' `
<br />Specifications. IV
<br />11. All storm sewers discharging into wetlands or water bodies shall outlet at or below the normal water level of the respective wetland or water 0.
<br />body at an elevation where the downstream slope is 1 percent or flatter. The normal water level shall be the invert elevation of the outlet of the O
<br />wetland or water body.
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<br />12. All storm sewer catch basins not needed for site drainage during construction shall be covered to prevent runoff from entering the storm sewer
<br />system. Catch basins necessary for site drainage during construction shall be provided with inlet protection. I-
<br />13. In areas where concentrated flows occur (such as swales and areas in front of storm catch basins and intakes) the erosion control facilities O
<br />shall be backed by stabilization structure to protect those facilities from the concentrated flows. Z
<br />14. Inspect the construction site once every seven days during active construction and within 24 hours after a rainfall event greater than 0.5 inches
<br />in 24 hours. All inspections shall be recorded in the SWPPP.
<br />15. All silt fences must be repaired, replaced, or supplemented when they become nonfunctional or the sediment reaches 1/3 of the height of the Q
<br />fence. These repairs must be made within 24 hours of discovery, or as soon as field conditions allow access. All repairs shall be recorded in Z
<br />the SWPPP. C-
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<br />16. If sediment escapes the construction site, off -site accumulations of sediment must be removed in a manner and at a frequency sufficient to
<br />minimize off -site impacts.
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<br />17. All soils tracked onto pavement shall be removed daily. n/
<br />18. All infiltration areas must be inspected to ensure that no sediment from ongoing construction activity is reaching the infiltration area and these
<br />areas are protected from compaction due to construction equipment driving across the infiltration area.
<br />19. Temporary soil stockpiles must have silt fence or other effective sediment controls, and cannot be placed in surface waters, including
<br />stormwater conveyances such as curb and gutter systems, or conduits and ditches unless there is a bypass in place for the stormwater.
<br />20. Collected sediment, asphalt and concrete millings, floating debris, paper, plastic, fabric, construction and demolition debris and other wastes
<br />must be disposed of properly and must comply with MPCA disposal requirements.
<br />21. Oil, gasoline, paint and any hazardous substances must be properly stored, including secondary containment, to prevent spills, leaks or other
<br />discharge. Restricted access to storage areas must be provided to prevent vandalism. Storage and disposal of hazardous waste must be in
<br />compliance with MPCA regulations.
<br />22. External washing of trucks and other construction vehicles must be limited to a defined area of the site. Runoff must be contained and waste
<br />properly disposed of. No engine degreasing is allowed onsite.
<br />23. All liquid and solid wastes generated by concrete washout operations must be contained in a leak -proof containment facility or impermeable
<br />liner. A compacted clay liner that does not allow washout liquids to enter ground water is considered an impermeable liner. The liquid and
<br />solid wastes must not contact the ground, and there must not be runoff from the concrete washout operations or areas. Liquid and solid
<br />wastes must be disposed of properly and in compliance with MPCA regulations. A sign must be installed adjacent to each washout facility to
<br />inform concrete equipment operators to utilize the proper facilities.
<br />24. Upon completion of the project and stabilization of all graded areas, all temporary erosion control facilities (silt fences, hay bales, etc.) shall be
<br />removed from the site.
<br />25. All permanent sedimentation basins must be restored to their design condition immediately following
<br />stabilization of the site.
<br />26. Contractor shall submit Notice of Termination for MPCA-NPDES permit within 30 days after
<br />Final Stabilization. 9h
<br />NORTH
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<br />I hereby certify that this plan,
<br />specifications or report was prepared
<br />by me or under my direct supervision
<br />and that I am a duly licensed
<br />Professional Engineer under the laws
<br />of the state of Minnesota.
<br />Thomas J. Herkenhoff, P.E.
<br />Date: 03.16.23 Lic. No.: 25520
<br />Rev. Date Description
<br />Project #: 12226046
<br />Drawn By: KBK
<br />Checked By: TJH
<br />Issue Date: 03.16.23
<br />Sheet Title:
<br />GRADING AND
<br />EROSION CONTROL
<br />PLAN
<br />Sheet:
<br />P:\Projects\Projects - 2022\12226046 - Mounds View Residential\C. Design\Drawing Files\12226046 C300.dwg
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