|
P:\Projects\Projects - 2019\12196195 - WBL Schools New Elementary\C. Design\Drawing Files\12196195 - C600 - Details.dwgFEDCBA12345678MNNorthCheck:Drawn:Date:Comm:Scale: Per PlanMatt Woodruff, P.E.Date: Lic. No.:11.20.202041885I 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.MJWKBK11.20.202012196195RevisionsDescriptionDateNum1/26/2021 12:08:45 PMINDEPENDENT SCHOOLDISTRICT #624NEW ELEMENTARYSCHOOL4855 Bloom AveWhite Bear Lake, Minnesota 5511015198 Forest BoulevardHugo, Minnesota 550383524 Labore RoadWhite Bear Lake, MN 55110651.481.9120 (f) 651.481.9201www.larsonengr.comC 2020 Larson Engineering, Inc. All rights reserved.3524 Labore RoadWhite Bear Lake, MN 55110651.481.9120 (f) 651.481.9201www.larsonengr.comLarsonEngineering, Inc.501 South Eighth StreetMinneapolis, MN 55404krausanderson.com | 612 332 7281Addendum #2December 10, 20201Pond RevisionsJanuary 15, 20212City SubmittalFebruary 5, 2021C603DETAILSNOT TO SCALECROSS SECTIONINFILTRATION BASIN7C603VARIES(PER PLAN)SLOPE PER PLAN(4:1 MAX)6" MINSLOPE PER PLAN(4:1 MAX)NOTES:1.THE EXISTING SOILS SHALL BE PROTECTED FROM COMPACTION DUE TO CONSTRUCTION TRAFFIC.AREAS SHALL BE STAKED AND MARKED OFF, WITH ONLY LOW IMPACT EQUIPMENT (TRACKED ORSIMILAR) ALLOWED.MNDOT SEED MIX: 33-261OR AS SPECIFIED ON LANDSCAPE PLANEXTEND MODIFIED SOIL UP SLOPESTO POND OUTLET ELEVATIONEXISTING SOILSPRE-MIXED PLANTING MEDIUM: PLAISTED'S RAIN GARDENPEAT MIX (80% SAND, 20% PEAT),OR EQUAL. PLANTINGMEDIUM SHALL PROVIDE 0.8"/HR TO 1.6"/HR INFILTRATIONRATE AT SPECIFIED COMPACTION, VERIFY W/SUPPLIER.EXCAVATE POND BOTTOM TO EXISTING PERMEABLESOILS. REMOVE AND DISPOSE OF EXISTING TOPSOILAND ANY SOILS NON-CONDUCIVE TO INFILTRATION.SEE GEOTECH REPORT.18" MINLOOSEN/DECOMPACT SOIL BELOWBASIN BOTTOM, 18" MINIMUM DEPTH.NOT TO SCALERIP-RAP AT OUTLETS1C603D5D (10' MIN.)41412'2'MN/DOT CLASS IIIRIP-RAPAAMN/DOT CLASS IIIRIP-RAP2'PLANSECTION A-ANOTE:FW300 MIRAFI FABRIC OR EQUAL5D (10' MIN.)2'2'2'WOVEN FILTERFABRIC6"14 DWOVEN FILTERFABRICNOT TO SCALEEROSION CONTROL BLANKET3C603SLOPE INSTALLATIONNOTE: WHEN USING CELL-O-SEED DO NOT SEED PREPARED AREA. CELL-O-SEED MUST BE INSTALLED WITH PAPER SIDE DOWN.3" (7.5 CM) OVERLAP. STAPLE THROUGH OVERLAPPED AREA, APPROXIMATELY 12" (30 CM) APART ACROSS ENTIREBACKFILL AND COMPACT THE TRENCH AFTER STAPLING. APPLY SEED TO COMPACTED SOIL AND FOLD REMAINING 12" (30 CM) IN APPROPRIATE LOCATIONS AS SHOWN IN THE STAPLE PATTERN GUIDE. WHEN USING THE DOT SYSTEM , STAPLES/STAKES SHOULD BE PLACED THROUGH EACH OF THE COLORED DOTS CORRESPONDING TO THE APPROPRIATE STAPLE PATTERN.1. PREPARE SOIL BEFORE INSTALLING ROLLED EROSION CONTROL PRODUCTS (RECP's), INCLUDING ANY NECESSARY APPLICATION 3. ROLL THE RECP's (A.) DOWN OR (B.) HORIZONTALLY ACROSS THE SLOPE. RECP's WILL UNROLL WITH APPROPRIATE SIDE 4. THE EDGES OF PARALLEL RECP's MUST BE STAPLED WITH APPROXIMATELY 2" - 5" (5 CM - 12.5 CM) OVERLAP DEPENDING5. CONSECUTIVE RECP's SPLICED DOWN THE SLOPE MUST BE PLACED END OVER END (SHINGLE STYLE) WITH AN APPROXIMATE AGAINST THE SOIL SURFACE. ALL RECP's MUST BE SECURELY FASTENED TO SOIL SURFACE BY PLACING STAPLES/STAKES2. BEGIN AT THE TOP OF THE SLOPE BY ANCHORING THE RECP's IN A 6" (15 CM) DEEP X 6" (15 CM) WIDE TRENCHWITH APPROXIMATELY 12" (30cm) OF RECP's EXTENDED BEYOND THE UP-SLOPE PORTION OF THE TRENCH. ANCHOR THERECP's WITH A ROW OF STAPLES/STAKES APPROXIMATELY 12" (30 CM) APART IN THE BOTTOM OF THE TRENCH.PORTION OF RECP's BACK OVER SEED AND COMPACTED SOIL. SECURE RECP's OVER COMPACTED SOIL WITH A ROW OFSTAPLES/STAKES SPACED APPROXIMATELY 12" (30 CM) APART ACROSS THE WIDTH OF THE RECP's. OF LIME, FERTILIZER, AND SEED.1.3B.12"(30 cm)(15 cm)6"3A.2"-5"4.(5cm-12.5cm)(7.5cm)3"2.(15 cm)6"ENGINEERING FABRICWIRE MESH REINFORCEMENTHIGH FLOW AREASNATURAL SOILDIRECTIONOF RUNOFFNOT TO SCALEINSTALLATION DETAILSILT FENCE4C603NOTE: DEPENDING UPON CONFIGURATION, ATTACH FABRIC TO WIRE MESHWITH HOG RINGS, STEEL POSTS WITH WIRES, OR WOOD POSTS WITH STAPLES.FABRIC ANCHORAGETRENCH. BACKFILL WITHTAMPED NATURAL SOILGEOTEXTILE FABRIC50' MINIMUM6" MINIMUM1"-2" WASHED ROCKNOT TO SCALEROCK CONSTRUCTION ENTRANCE2C603AS REQUIREDPUBLIC ROADHARD SURFACE/NOT TO SCALEDEVICE (OR APPROVED EQ.)INFRASAFE INLET PROTECTION 6C603400 MICRON FILTERBAG IN EACH BASKET2 BASKETS WITH 400 MICRON FILTERBAGS. TO BE CHECKED PERIODICALLY ANDCLEANED OUT AFTER EACH RAIN EVENTFITS NEENAH 1642 AND1733 FRAMES OR EQUALPLANPROFILEFLOW8" CURLEX SEDIMENT LOGSWOOD STAKE OR SAND BAG24" MIN.WOOD STAKE TO ONLYPENETRATE NETTING,NOT CURLEX MATERIALRRGROUNDNOTES:1. STAKE OR SAND BAG SPACING SHALL BE 2 FEET O.C.NOT TO SCALESEDIMENT ROLL DETAIL5C603METAL, WOOD POST, OR STAKE.8' MAX. SPACING, 2' INTO GROUND.1.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 siltation fencing,and/or disk the soil parallel to the contours as deemed necessary to further control erosion. Allchanges 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 14 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 surface water.Stabilization of the last 200 lineal feet must be completed within 24 hours after connecting to asurface water. Stabilization of the remaining portions of any temporary or permanent ditches orswales must be complete within 14 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 slope is 1percent or flatter. The normal water level shall be the invert elevation of the outlet of the wetland orwater 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 protect thosefacilities from the concentrated flows.14.Inspect the construction site once every seven days during active construction and within 24 hoursafter a rainfall event greater than 0.5 inches in 24 hours. All inspections shall be recorded in theSWPPP.15.All BMPs must be repaired, replaced, or supplemented when they become nonfunctional or thesediment reaches 1/3 of the capacity of the BMP. These repairs must be made within 24 hours ofdiscovery, 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 in amanner 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 of thesite. Runoff must be contained and waste properly disposed of. No engine degreasing is allowedonsite.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 compliance withMPCA regulations. A sign must be installed adjacent to each washout facility to inform concreteequipment 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.EROSION CONTROL NOTES
|