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NEW BUILDING ADDITIONFFE: 926.10 (ARCH 100' 00")ONEKA ELEMENTARYONEKA PARKWAY NWWDrainage & Utility Easement per plat of WATERS EDGEDrainage & Utility Easement per plat of WATERS EDGEPonding & Flowage Easement over all of Drainage &Utility Easement of Outlot A, WATERS EDGE per Doc.No. 596408 & 3482732Ponding & Flowage Easement over all of Drainage &Utility Easement of Outlot A, WATERS EDGE per Doc.No. 596408 & 3482732WWW921
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<br />4 924921922922920W E T L A N D TBOTTOM = 917.00PERMANENT POOL = 920.50100 YR HWL = 921.60EOF = 922.30MEASURED ELEV. 11/03/21 = 920.78MEASURED ELEV. 02/21/22 = 920.44(ICE)P O N D 4BOTTOM = 915.00PERMANENT POOL = 918.50100 YR HWL = 920.30MEASURED ELEV. 11/03/21 = 919.11MEASURED ELEV. 02/21/22 = 918.37(ICE)P O N D 3Wetland Delineationper Kjolhaug Environmental Services Inc.Nov. 2021(typical)920925925
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<br />INLET PROTECTION(TYP.)ROCK CONSTRUCTIONENTRANCE (TYP.)DOUBLE SILT FENCEADJACENT TO WETLANDBIO ROLL (TYP.)RIP RAP AT OUTLET(TYP.)RIP RAP AT OUTLET(TYP.)921922923924924
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<br />BIO ROLL (TYP.)BIO ROLL (TYP.)3524 Labore RoadWhite Bear Lake, MN 55110651.481.9120 (f) 651.481.9201www.larsonengr.comC 2021 Larson Engineering, Inc. All rights reserved.P:\Projects\Projects - 2021\12216147 - Oneka Elem Addition & Renovation - Wold\C. Design\Drawing Files\12216147 - C400 Erosion Control.dwg
<br />3524 Labore RoadWhite Bear Lake, MN 55110651.481.9120 (f) 651.481.9201www.larsonengr.comLarsonEngineering, Inc.0NORTH153060FEDCBA12345678MNNorthCheck:Drawn:Date:Comm:Scale:Greg A. Buchal, P.E.Date: Lic. No.:I hereby certify that this plan, specifications or reportwas prepared by me or under my direct supervisionand that I am a duly licensed Professional Engineerunder the laws of the state of Minnesota.GABMTH03.04.202212216147RevisionsDescriptionDateNumNOT FOR CONSTRUCTION03.04.2022 SITE PLAN SUBMITTAL3/4/2022 8:56:39 AM
<br />INDEPENDENT SCHOOLDISTRICT #624Oneka ElementarySchool Addition andRenovation4855 Bloom AvenueWhite Bear Lake, MN 551104888 Heritage Pkwy NorthHugo, MN 55038PROPOSED CONTOURS - MAJOR INTERVALGRADE BREAK LINEPROPOSED CONTOURS - MINOR INTERVAL949950950EXISTING CONTOURS2.0%GRADE SLOPESILT FENCE, SEE DETAIL 3/C701RIP-RAP / ROCK CONST. ENTRANCEINLET PROTECTIONLEGEND1.Owner and Contractor shall obtain MPCA-NPDES permit. Contractor shall be responsible for allfees pertaining to this permit. The SWPPP shall be kept onsite at all times.2.Install temporary erosion control measures (inlet protection, silt fence, and rock constructionentrances) prior to beginning any excavation or demolition work at the site.3.Erosion control measures shown on the erosion control plan are the absolute minimum. Thecontractor shall install temporary earth dikes, sediment traps or basins, additional siltationfencing, and/or disk the soil parallel to the contours as deemed necessary to further controlerosion. All changes shall be recorded in the SWPPP.4.All construction site entrances shall be surfaced with crushed rock across the entire width of theentrance and from the entrance to a point 50' into the construction zone.5.The toe of the silt fence shall be trenched in a minimum of 6”. The trench backfill shall becompacted with a vibratory plate compactor.6.All grading operations shall be conducted in a manner to minimize the potential for site erosion.Sediment control practices must be established on all down gradient perimeters before any upgradient land disturbing activities begin.7.All exposed soil areas must be stabilized as soon as possible to limit soil erosion but in no caselater than 7 days after the construction activity in that portion of the site has temporarily orpermanently ceased. Temporary stockpiles without significant silt, clay or organic components(e.g., clean aggregate stockpiles, demolition concrete stockpiles, sand stockpiles) and theconstructed base components of roads, parking lots and similar surfaces are exempt from thisrequirement.8.The normal wetted perimeter of any temporary or permanent drainage ditch or swale that drainswater from any portion of the construction site, or diverts water around the site, must be stabilizedwithin 200 lineal feet from the property edge, or from the point of discharge into any surfacewater. Stabilization of the last 200 lineal feet must be completed within 24 hours after connectingto a surface water. Stabilization of the remaining portions of any temporary or permanent ditchesor swales must be complete within 7 days after connecting to a surface water and construction inthat portion of the ditch has temporarily or permanently ceased.9.Pipe outlets must be provided with energy dissipation within 24 hours of connection to surfacewater.10.All riprap shall be installed with a filter material or soil separation fabric and comply with theMinnesota Department of Transportation Standard Specifications.11.All storm sewers discharging into wetlands or water bodies shall outlet at or below the normalwater level of the respective wetland or water body at an elevation where the downstream slopeis 1 percent or flatter. The normal water level shall be the invert elevation of the outlet of thewetland or water body.12.All storm sewer catch basins not needed for site drainage during construction shall be covered toprevent runoff from entering the storm sewer system. Catch basins necessary for site drainageduring construction shall be provided with inlet protection.13.In areas where concentrated flows occur (such as swales and areas in front of storm catch basinsand intakes) the erosion control facilities shall be backed by stabilization structure to protectthose facilities from the concentrated flows.14.Inspect the construction site once every seven days during active construction and within 24hours after a rainfall event greater than 0.5 inches in 24 hours. All inspections shall be recordedin the SWPPP.15.All BMPs must be repaired, replaced, or supplemented when they become nonfunctional or thesediment reaches 1/3 of the capacity. These repairs must be made within 24 hours of discovery,or as soon as field conditions allow access. All repairs shall be recorded in the SWPPP.16.If sediment escapes the construction site, off-site accumulations of sediment must be removed ina manner and at a frequency sufficient to minimize off-site impacts.17.All soils tracked onto pavement shall be removed daily.18.All infiltration areas must be inspected to ensure that no sediment from ongoing constructionactivity is reaching the infiltration area and these areas are protected from compaction due toconstruction equipment driving across the infiltration area.19.Temporary soil stockpiles must have silt fence or other effective sediment controls, and cannot beplaced in surface waters, including stormwater conveyances such as curb and gutter systems, orconduits and ditches unless there is a bypass in place for the stormwater.20.Collected sediment, asphalt and concrete millings, floating debris, paper, plastic, fabric,construction and demolition debris and other wastes must be disposed of properly and mustcomply with MPCA disposal requirements.21.Oil, gasoline, paint and any hazardous substances must be properly stored, including secondarycontainment, to prevent spills, leaks or other discharge. Restricted access to storage areas mustbe provided to prevent vandalism. Storage and disposal of hazardous waste must be incompliance with MPCA regulations.22.External washing of trucks and other construction vehicles must be limited to a defined area ofthe site. Runoff must be contained and waste properly disposed of. No engine degreasing isallowed onsite.23.All liquid and solid wastes generated by concrete washout operations must be contained in aleak-proof containment facility or impermeable liner. A compacted clay liner that does not allowwashout liquids to enter ground water is considered an impermeable liner. The liquid and solidwastes must not contact the ground, and there must not be runoff from the concrete washoutoperations or areas. Liquid and solid wastes must be disposed of properly and in compliancewith MPCA regulations. A sign must be installed adjacent to each washout facility to informconcrete equipment operators to utilize the proper facilities.24.Upon completion of the project and stabilization of all graded areas, all temporary erosion controlfacilities (silt fences, hay bales, etc.) shall be removed from the site.25.All permanent sedimentation basins must be restored to their design condition immediatelyfollowing stabilization of the site.26.Contractor shall submit Notice of Termination for MPCA-NPDES permit within 30 days after FinalStabilization.27.Where five (5) or more acres of disturbed soil drain to a common location, the contractor mustprovide a temporary sediment basin that meets MPCA Stormwater Permit guidelines. Thetemporary 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 acredrained, whichever is greater.28.Erosion control blankets are to be placed on all 1:4 slopes or greater.EROSION CONTROL NOTESC400EROSIONCONTROLPLANCONCRETE WASHOUT STATION(TO BE DETERMINED ON SITE)EROSION CONTROL BLANKET,SEE DETAIL 4/C701BIO ROLL, SEE DETAIL 2/C701NWLNWLEXISTING WETLAND EDGENEW WETLAND EDGE
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