|
1
<br />i
<br />A
<br />Drainage & Utility Easement per plat of WATERS EDGE
<br />Ponding & Flowage Easement over all of Drainage &
<br />Utility Easement of Outlot A, WATERS EDGE per Doc.
<br />No. 596408 & 3482732
<br />B
<br />1 I
<br />--IM
<br />Drainage age & Utility Easement per plat of WATERS E �E \
<br />\ I
<br />Ponding & Flowage Easement over all of Drainage & I
<br />Utility Easement of Outlot A, WATERS EDGE per Doc. I
<br />No. 596408 & 3482732 I
<br />J
<br />E /
<br />/ ,
<br />2 3
<br />/
<br />/ N
<br />� N /
<br />rn`1
<br />/ I I
<br />/ / I
<br />I /
<br />/ / I
<br />O N D
<br />IM -VA \ \ / I OTTOM
<br />\ I ERMANE
<br />100 R 2,
<br />EOF
<br />MEASURE
<br />MEASURI
<br />(ICE)
<br />4 5
<br />I
<br />6
<br />VA
<br />I
<br />LEGEND
<br />8
<br />- - - - - 950 - - - EXISTING CONTOURS
<br />950 PROPOSED CONTOURS - MAJOR INTERVAL
<br />949 PROPOSED CONTOURS - MINOR INTERVAL
<br />\- - - - - - - - - - - GRADE BREAK LINE
<br />GRADE SLOPE
<br />/ \ \ SILT FENCE, SEE DETAIL 3/C701
<br />\ BIO ROLL, SEE DETAIL 2/C701
<br />\ EXISTING WETLAND EDGE
<br />\ \ -NW-NW-NEW WETLAND EDGE
<br />\
<br />\ \ \ o00000o RIP -RAP / ROCK CONST. ENTRANCE
<br />\\ rr JJ \ O O O O
<br />\ \ \\ \ EROSION CONTROL BLANKET,
<br />\ \ \ \ SEE DETAIL 4/C701
<br />INLET PROTECTION
<br />r I CONCRETE WASHOUT STATION
<br />L . . . J (TO BE DETERMINED ON SITE)
<br />\\ \\ \ EROSION CONTROL NOTES
<br />\ \\ 1. Owner and Contractor shall obtain MPCA-NPDES permit. Contractor shall be responsible for all
<br />\ \ \ fees pertaining to this permit. The SWPPP shall be kept onsite at all times.
<br />2. Install temporary erosion control measures (inlet protection, silt fence, and rock construction
<br />entrances) prior to beginning any excavation or demolition work at the site.
<br />3. Erosion control measures shown on the erosion control plan are the absolute minimum. The
<br />\ \ \ contractor shall install temporary earth dikes, sediment traps or basins, additional siltation
<br />TYP.) \ \ 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
<br />entrance and from the entrance to a point 50' into the construction zone.
<br />1 \
<br />5. The toe of the silt fence shall be trenched in a minimum of 6". The trench backfill shall be
<br />BIO ROLL (TYP.) \ \ \ compacted with a vibratory plate compactor.
<br />1 \\ 6. All grading operations shall be conducted in a manner to minimize the potential for site erosion.
<br />0 \ \ \ Sediment control practices must be established on all down gradient perimeters before any up
<br />\ \ gradient land disturbing activities begin.
<br />0o0Coco
<br />\ \ \ \ \
<br />/ ) 00 000 0 \ \\ \\ \\ \ 7. All exposed soil areas must be stabilized as soon as possible to limit soil erosion but in no case
<br />0 0 \ \ later than 7 days after the construction activity in that portion of the site has temporarily or
<br />\ o o ° 0 0 \\ \ \ permanently ceased. Temporary stockpiles without significant silt, clay or organic components
<br />\ o \ \ (e.g., clean aggregate stockpiles, demolition concrete stockpiles, sand stockpiles) and the
<br />0 0 0 ROCK CONSTRUCTION constructed base components of roads, parking lots and similar surfaces are exempt from this
<br />\\ ENTRANCE (TYP.) \ requirement.
<br />\ \ A \\ \ 8. The normal wetted perimeter of any temporary or permanent drainage ditch or swale that drains
<br />\\ \ \ \ water from any portion of the construction site, or diverts water around the site, must be stabilized
<br />\ \ \ 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
<br />r
<br />to a surface water. Stabilization of the remaining portions of any temporary or permanent ditches
<br />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. Pipe outlets must be provided with energy dissipation within 24 hours of connection to surface
<br />\ \ \ \ \ water.
<br />10. All riprap shall be installed with a filter material or soil separation fabric and comply with the
<br />Minnesota Department of Transportation Standard Specifications.
<br />c \ \ \ 11. All storm sewers discharging into wetlands or water bodies shall outlet at or below the normal
<br />rn \ \ \ \ \ water level of the respective wetland or water body at an elevation where the downstream slope
<br />J \ is 1 percent or flatter. The normal water level shall be the invert elevation of the outlet of the
<br />\\ \\ \\ \ O \ wetland or water body.
<br />\ \ \ \ \ Z 12. All storm sewer catch basins not needed for site drainage during construction shall be covered to
<br />prevent runoff from entering the storm sewer system. Catch basins necessary for site drainage
<br />r
<br />\ \ during construction shall be provided with inlet protection.
<br />7 13. In areas where concentrated flows occur (such as swales and areas in front of storm catch basins
<br />J \ \ \ 0 \ and intakes) the erosion control facilities shall be backed by stabilization structure to protect
<br />7, \ those facilities from the concentrated flows. \ \ !
<br />\\ \ \ \\ \ 14. Inspect the construction site once every seven days during active construction and within 24
<br />\ \ \ hours after a rainfall event greater than 0.5 inches in 24 hours. All inspections shall be recorded
<br />j/�'(' '' \ in the SWPPP.
<br />\ \ \ t\ J \\ \\ \
<br />\ 15. All BMPs must be repaired, replaced, or supplemented when they become nonfunctional or the
<br />\ \ sediment reaches 1/3 of the capacity. These repairs must be made within 24 hours of discovery,
<br />or as soon as field conditions allow access. All repairs shall be recorded in the SWPPP.
<br />\ \ \ 16. If sediment escapes the construction site, off -site accumulations of sediment must be removed in
<br />a manner and at a frequency sufficient to minimize off -site impacts.
<br />17. All soils tracked onto pavement shall be removed daily.
<br />\ \ \ \ \ 18. All infiltration areas must be inspected to ensure that no sediment from ongoing construction
<br />activity is reaching the infiltration area and these areas are protected from compaction due to
<br />-0 9r \ \ \ \ \ \ construction equipment driving across the infiltration area.
<br />\ \ \ \ 19. Temporary soil stockpiles must have silt fence or other effective sediment controls, and cannot be
<br />rn 00 �o�� \ \ placed in surface waters, including stormwater conveyances such as curb and gutter systems, or
<br />BIO ROLL (TYP.) \
<br />M `"• '� \ conduits and ditches unless there is a bypass in place for the stormwater.
<br />N RIP RAP OUTLET \\ \ \ \ 20. Collected sediment, asphalt and concrete millings, floating debris, paper, plastic, fabric,
<br />°'N ' (TYP.) 1\ \ \ construction and demolition debris and other wastes must be disposed of properly and must
<br />0) comply with MPCA disposal requirements.
<br />/
<br />NL ROTECTION \ \\ \ \
<br />(TYP. \ \ \ \ 21. Oil, gasoline, paint and any hazardous substances must be properly stored, including secondary
<br />\ \ \ containment, to prevent spills, leaks or other discharge. Restricted access to storage areas must
<br />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
<br />the site. Runoff must be contained and waste properly disposed of. No engine degreasing is
<br />allowed onsite.
<br />23. All liquid and solid wastes generated by concrete washout operations must be contained in a
<br />leak -proof containment facility or impermeable liner. A compacted clay liner that does not allow
<br />1 \ 1 \ washout liquids to enter ground water is considered an impermeable liner. The liquid and solid
<br />000 1 ` \ \ 1 wastes must not contact the ground, and there must not be runoff from the concrete washout
<br />000
<br />`\ �\ \\ \:. \ \\ 1 \ operations or areas. Liquid and solid wastes must be disposed of properly and in compliance
<br />with MPCA regulations. A sign must be installed adjacent to each washout facility to inform
<br />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
<br />\ \ \ \ \ I RIP RAP AT OUTLET facilities (silt fences, hay bales, etc.) shall be removed from the site.
<br />\\ \ \ \\ \ \ I \.
<br />(TYP.) \ \ \ \ 25. All permanent sedimentation basins must be restored to their design condition immediately
<br />\ \ \ r \ \ following stabilization of the site.
<br />POND 3
<br />Contractor shall submit Notice of Termination for MPCA-NPDES permit within 30 days after Final
<br />�\ BOTTOM = 915.00 \ \ \ \ Stabilization.
<br />PERMANENT \ `\ PERMANENT POOL = 918.50 \ \ << \
<br />\ \ 100 YR HWL = 920.30 \ \\ `\ \ \
<br />\ \ \ \ �l \\\ 27. Where five (5) or more acres of disturbed soil drain to a common location, the contractor must
<br />MEASURED ELEV. 11I03/21 - 919.11
<br />\ provide a temporary sediment basin that meets MPCA Stormwater Permit guidelines. The
<br />MEASURED ELEV. 02/21/22 = 918.3 \ \ `\ \\ a \ I temporary basin must provide live storage for a calculated volume of runoff from a two (2)-year,
<br />(ICE) \ \ \ \ \ �.� \I 24-hour storm from each acre drained to the basin or 1,800 cubic feet of live storage per acre
<br />drained, whichever is greater.
<br />l
<br />\ 1 J \ \
<br />28. Erosion control blankets are to be placed on all 1:4 slopes or greater.
<br />\�\ \\
<br />Wetland Delineation \\ \\ \ \/ / / \ \\ \ A- \ \\ \ \\
<br />IF `\ ' / - I / per Kjolh ug Environmental Services Inc.
<br />1 / /
<br />---- % \ l\ - I / / / /' (typical)
<br />I \\i//' I \ r� ��� \-'l I. .-•� (`�_ � '' _ ., / l ,l it / \ \. \ \� \\ \� / i� �/ `\ \. \ �.�� \ . \ \\.
<br />I
<br />I
<br />I
<br />I
<br />\
<br />NORTH
<br />7L77.....�
<br />0 15 30 60
<br />Oneka Elementary
<br />School Addition and
<br />Renovation
<br />4888 Heritage Pkwy North
<br />Hugo, MN 55038
<br />INDEPENDENT SCHOOL
<br />DISTRICT #624
<br />4855 Bloom Avenue
<br />White Bear Lake, MN 55110
<br />WOLD ARCHITECTS
<br />AND ENGINEERS
<br />332 Minnesota Street, Suite W2000
<br />Saint Paul, MN 55101
<br />woldae.com 1 651 227 7773
<br />Larson
<br />Engineering, Inc.
<br />3524 Labore Road
<br />White Bear Lake, MN 55110
<br />651.481.9120 (f) 651.481.9201
<br />www.larsonengr.com
<br />© 2021 Larson Engineering, Inc. All rights reserved.
<br />I hereby certify that this plan, specifications or report
<br />was prepared by me or under my direct supervision
<br />and that I am a duly licensed Professional Engineer
<br />under the laws of the state of Minnesota.
<br />Greg A. Buchal, P.E.
<br />Date: Lic. No.:
<br />Revisions
<br />Description Date Num
<br />Comm: 12216147
<br />Date: 03.04.2022
<br />Drawn: MTH
<br />Check: GAB North
<br />EROSION
<br />CONTROL
<br />PLAN
<br />Scale:
<br />,11
<br />WL
<br />3,04,2022 SITE PLAN SUBMITTAL
<br />NOT FOR CONSTRUCTION 00
<br />
|