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<br />LEGEND
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<br />- - - - 950 - - - -
<br />EXISTING CONTOURS
<br />PROPOSED CONTOURS - MAJOR INTERVAL
<br />950
<br />PROPOSED CONTOURS - MINOR INTERVAL
<br />949
<br />- - - - - - -
<br />GRADE BREAK LINE
<br />GRADE SLOPE
<br />SILT FENCE
<br />SEDIMENT ROLL
<br />o°o°o°o
<br />RIP -RAP / ROCK CONST. ENTRANCE
<br />INFILTRATION BASIN
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<br />INLET PROTECTION
<br />r
<br />CONCRETE WASHOUT STATION
<br />L J
<br />(LOCATE DURING CONSTRUCTION)
<br />. . .
<br />950.00 TC
<br />SPOT ABBREVIATIONS:
<br />949.50 GL
<br />TC - TOP OF CURB
<br />GL - GUTTER LINE
<br />B - BITUMUNOUS
<br />G - GRADE
<br />C - CONCRETE
<br />CC-CURBCUT
<br />EOF - EMERGENCY OVERFLOW
<br />TS - TOP OF STEP
<br />BS - BOTTOM OF STEP
<br />IGRADING NOTES
<br />(*) - EXISTING TO BE VERIFIED
<br />WBL
<br />TRANSPORTATION
<br />FACILITY
<br />13411 Fenway Blvd N
<br />Hugo, MN 55038
<br />INDEPENDENT SCHOOL
<br />DISTRICT #624
<br />4855 Bloom Avenue
<br />White Bear Lake, MN 55110
<br />I
<br />1. Tree protection consisting of snow fence or safety fence installed at the drip line shall be in place prior to beginning
<br />any grading or demolition work at the site. WOLD ARCHITECTS
<br />2. All elevations with an asterisk (*) shall be field verified. If elevations vary significantly, notify the Engineer for further AND ENGINEERS
<br />instructions.
<br />332 Minnesota Street, Suite W2000
<br />3. Grades shown in paved areas represent finish elevation. Saint Paul, MN 55101
<br />4. All construction shall be performed in accordance with state and local standard specifications for construction. woldae.com 1 651 227 7773
<br />EROSION CONTROL NOTES
<br />1.
<br />Owner and Contractor shall obtain MPCA-NPDES permit. Contractor shall be responsible for all fees pertaining to this
<br />permit. The SWPPP shall be kept onsite at all times.
<br />Larson
<br />2.
<br />Install temporary erosion control measures (inlet protection, silt fence, and rock construction entrances) prior to
<br />Engineering, Inc.
<br />beginning any excavation or demolition work at the site.
<br />3524 Labore Road
<br />3.
<br />Erosion control measures shown on the erosion control plan are the absolute minimum. The contractor shall install
<br />White Bear Lake, MN 55110
<br />temporary earth dikes, sediment traps or basins, additional siltation fencing, and/or disk the soil parallel to the contours
<br />651.481.9120 (f) 651.481.9201
<br />as deemed necessary to further control erosion. All changes shall be recorded in the SWPPP.
<br />www.larsonengr.com
<br />4.
<br />All construction site entrances shall be surfaced with crushed rock across the entire width of the entrance and from the
<br />entrance to a point 50' Into the construction zone.
<br />©2020 Larson Engineering, Inc. All rights reserved.
<br />5.
<br />The toe of the silt fence shall be trenched in a minimum of 6". The trench backfill shall be compacted with a vibratory
<br />plate compactor.
<br />6.
<br />All grading operations shall be conducted in a manner to minimize the potential for site erosion. Sediment control
<br />practices must be established on all down gradient perimeters before any up gradient land disturbing activities begin.
<br />7.
<br />All exposed soil areas must be stabilized as soon as possible to limit soil erosion but in no case later than 7 days after
<br />the construction activity in that portion of the site has temporarily or permanently ceased. Temporary stockpiles without
<br />significant silt, clay or organic components (e.g., clean aggregate stockpiles, demolition concrete stockpiles, sand
<br />stockpiles) and the constructed base components of roads, parking lots and similar surfaces are exempt from this
<br />requirement.
<br />8.
<br />The normal wetted perimeter of any temporary or permanent drainage ditch or swale that drains water from any portion
<br />of the construction site, or diverts water around the site, must be stabilized within 200 lineal feet from the property
<br />/
<br />edge, or from the point of discharge into any surface water. Stabilization of the last 200 lineal feet must be completed
<br />within 24 hours after connecting to a surface water. Stabilization of the remaining portions of any temporary or
<br />permanent ditches or swales must be complete within 7 days after connecting to a surface water and construction in
<br />that portion of the ditch has temporarily or permanently ceased.
<br />9.
<br />Pipe outlets must be provided with energy dissipation within 24 hours of connection to surface water.
<br />10.
<br />All riprap shall be installed with a filter material or soil separation fabric and comply with the Minnesota Department of
<br />Transportation Standard Specifications.
<br />11.
<br />All storm sewers discharging into wetlands or water bodies shall outlet at or below the normal water level of the
<br />respective wetland or water body at an elevation where the downstream slope is 1 percent or flatter. The normal water
<br />level shall be the invert elevation of the outlet of the wetland or water body.
<br />12.
<br />All storm sewer catch basins not needed for site drainage during construction shall be covered to prevent runoff from
<br />entering the storm sewer system. Catch basins necessary for site drainage during construction shall be provided with
<br />inlet protection.
<br />13.
<br />In areas where concentrated flows occur (such as swales and areas in front of storm catch basins and intakes) the
<br />erosion control facilities shall be backed by stabilization structure to protect those facilities from the concentrated flows.
<br />14.
<br />Inspect the construction site once every seven days during active construction and within 24 hours after a rainfall event
<br />greater than 0.5 inches in 24 hours. All inspections shall be recorded in the SWPPP.
<br />I
<br />15.
<br />All silt fences must be repaired, replaced, or supplemented when they become nonfunctional or the sediment reaches
<br />1/3 of the height of the fence. These repairs must be made within 24 hours of discovery, or as soon as field conditions
<br />allow access. All repairs shall be recorded in the SWPPP.
<br />16.
<br />If sediment escapes the construction site, off -site accumulations of sediment must be removed in a manner and at a
<br />frequency sufficient to minimize off -site impacts.
<br />M
<br />a' I 17.
<br />All soils tracked onto pavement shall be removed daily.
<br />18.
<br />All infiltration areas must be inspected to ensure that no sediment from ongoing construction activity is reaching the
<br />infiltration area and these areas are protected from compaction due to construction equipment driving across the
<br />infiltration area.
<br />I hereby certify that this plan, specifications or report
<br />was prepared by me or under my direct supervision
<br />19.
<br />Temporary soil stockpiles must have silt fence or other effective sediment controls, and cannot be placed in surface
<br />and that I am a duly licensed Professional Engineer
<br />waters, including stormwater conveyances such as curb and gutter systems, or conduits and ditches unless there is a
<br />under the laws of the state of Minnesota.
<br />bypass in place for the stormwater.
<br />20.
<br />Collected sediment, asphalt and concrete millings, floating debris, paper, plastic, fabric, construction and demolition
<br />Greg A. Buchal, P.E.
<br />debris and other wastes must be disposed of properly and must comply with MPCA disposal requirements.
<br />Date: 08.14.20 Lic. No.: 23793
<br />21
<br />Oil gasoline paint and any hazardous substances must be properly stored including secondary containment to
<br />prevent spills, leaks or other discharge. Restricted access to storage areas must be provided to prevent vandalism.
<br />Storage and disposal of hazardous waste must be in 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
<br />contained and waste 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
<br />facility or impermeable liner. A compacted clay liner that does not allow washout liquids to enter ground water is
<br />considered an impermeable liner. The liquid and solid wastes must not contact the ground, and there must not be
<br />runoff from the concrete washout operations or areas. Liquid and solid wastes must be disposed of properly and in
<br />compliance with MPCA regulations. A sign must be installed adjacent to each washout facility to inform concrete
<br />equipment operators to utilize the proper facilities.
<br />Revisions
<br />Description Date Num
<br />Addendum 1
<br />August 26, 2020
<br />1
<br />Addendum 2
<br />September 1, 2020
<br />2
<br />City Comments
<br />September 30, 2020
<br />3
<br />24. Upon completion of the project and stabilization of all graded areas, all temporary erosion control facilities (silt fences,
<br />hay bales, etc.) shall be removed from the site. Comm: 12196171
<br />25. All permanent sedimentation basins must be restored to their design condition immediately following stabilization of the Date: 08.14.2020
<br />site. Drawn: MTH
<br />26. Contractor shall submit Notice of Termination for MPCA-NPDES permit within 30 days after Final Stabilization. Check: GAB North
<br />27. Erosion control blankets are to be placed on all slopes 4:1 or greater. Reference sheet C500 for erosion control
<br />blanket placement. GRADING AND
<br />EROSION
<br />NORTH
<br />0 15 30 60
<br />CONTROL
<br />PLAN
<br />7 1 1
<br />0
<br />0
<br />0
<br />300
<br />
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