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PRELIMCADD USER: Benjamin Lucas FILE: C:\USERS\BENJAMINLUCAS\DROPBOX\PROJECTS\230303 - LITTLE CANADA AFFORDABLE - LUPE\WORKING FILES\CAD\DWG\PLAN SHEETS\C200 - EROS.DWG PLOT SCALE: 1:1 PLOT DATE: 7/28/2023 10:17 AM
<br />23030307-28-2023BJLC-200SWPPP NARRATIVEBJLCOPYRIGHT © 2023 BY SOLUTION BLUE INC. ALL RIGHTS RESERVEDSOLUTION BLUE PROJECT NO:REVISION HISTORYDATEDESCRIPTION07/28/2023PRELIMINARY SUBMITTAL#01DESIGNED:REVIEWED:PHASE:SUMMARYDRAWN:INITIAL ISSUE:A. PROJECT DESCRIPTION:THE STORMWATER POLLUTION PREVENTION PLAN (SWPPP) IS REQUIRED FOR THE GENERAL PERMIT AUTHORIZATIONTO DISCHARGE STORMWATER ASSOCIATED WITH CONSTRUCTION ACTIVITY (NPDES PERMIT) AS REQUIRED BY THEMINNESOTA POLLUTION CONTROL AGENCY (MPCA) UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATIONSYSTEM/STATE DISPOSAL SYSTEM (NPDES/SDS). IN ADDITION TO THE SWPPP, AN EROSION CONTROL PLAN MEETINGTHE REQUIREMENTS OF THE MPCA NPDES PERMIT IS INCLUDED IN THIS CONSTRUCTION DOCUMENT.PROJECT NAME: LITTLE CANADA DEVELOPMENTDESCRIPTION: WEST OF RICE STREET & HWY 36 INTERSECTION ON COUNTY ROAD B EAST IN LITTLE CANADA,MINNESOTASITE ADDRESS: 0000 COUNTY ROAD B EASTCITY:LITTLE CANADASTATE: MINNESOTAZIP CODE: 55117COUNTY: RAMSEYLATITUDE: 45.008°W (DECIMAL)LONGITUDE: -93.096°N (DECIMAL)THIS PROJECT INCLUDES DEVELOPING THE VACANT PROPERTY NEAR RICE STREET AND COUNTY ROAD B EAST ANDCONSTRUCTING A 4-STORY SENIOR HOUSING BUILDING WITH UNDERGROUND AND SURFACE PARKING, SEWERINFRASTRUCTURE, STORMWATER INFRASTRUCTURE AND LANDSCAPING.ESTIMATED CONSTRUCTION START DATE: XX-XX-XXXXESTIMATED CONSTRUCTION END DATE: XX-XX-XXXXB.REGULATORY CONTEXT:1.SPECIAL AND/OR IMPAIRED WATERSN/A2.PLACEMENT OF FILL IN WATERS OF THE STATEN/A3.DRINKING WATER SUPPLY MANAGEMENT AREATHE PROJECT SITE IS NOT LOCATED WITHIN A DWSMA EMERGENCY RESPONSE AREA, THEREFORE INFILTRATIONBMP'S ARE ACCEPTABLE, PER MPCA AND WATERSHED STANDARDS.THE PROJECT'S STORMWATER DISCHARGE IS NOT ANTICIPATED TO IMPACT ANY OF THE FOLLOWING:OUTSTANDING RESOURCE VALUE WATERS, TROUT WATERS, WETLANDS, CALCEROUS FENS, PROPERTIES LISTED BYTHE NATIONAL REGISTER OF HISTORIC PLACES OR ARCHAEOLOGICAL SITESTHE PROJECT'S STORMWATER DISCHARGE IS NOT SUBJECT TO ADDITIONAL REGULATION DUE TO OTHER FORMALENVIRONMENTAL REVIEWS. THE PROJECT'S STORMWATER DISCHARGE NOT IS SUBJECT TO ADDITIONALREGULATION DUE TO ENDANGERED OR THREATENED SPECIES: N/AC.SOILS, SLOPES VEGETATION, AND CURRENT DRAINAGE PATTERNS1. THE SOILS ONSITE ARE MOSTLY LOAMY SANDS THROUGHOUT THE SITE.2. GRADES GENERALLY SLOPE DOWN FROM THE EAST BOUNDARY TO THE WEST BOUNDARY OF THE SITE. THERE ISNO STORMWATER INFRASTRUCTURE ON THE EXISTING SITE, STORM RUNOFF FLOWS OVERLAND TO THE WEST TOAN ADJACENT WETLAND.3. DRAINAGE PATTERNS WILL BE GENERALLY MAINTAINED FOR PROPOSED CONDITIONS. SURFACE RUNOFF FROMTHE DRIVEWAY AND PARKING AREAS WILL BE COLLECTED INTO TWO UNDERGROUND CHAMBER SYSTEMS ANDAN INFILTRATION BASIN THAT DISCHARGES TO THE STORM SEWER TO THE ADJACENT WETLAND. GRADINGOUTSIDE THE DRIVEWAY AND PARKING AREAS WILL MATCH EXISTING FLOW PATTERNS.4. THE EXISTING SITE IS HEAVILY FORESTED ACROSS THE WHOLE PROPERTY WITH A SINGLE GRAVEL ROAD.VEGETATION IMPACTED BY CONSTRUCTION ACTIVITY WILL BE REMOVED, AND SITE WILL BE REVEGETATED AFTERCONSTRUCTION AND PAVING ACTIVITIES HAVE BEEN COMPLETED PER THE LANDSCAPING PLANS.5. THE AVERAGE TOTAL ANNUAL PRECIPITATION IS ABOUT 28.32 INCHES. OF THIS, ABOUT 17.31 INCHES (61%)USUALLY FALL IN MAY THROUGH SEPTEMBER. THE AVERAGE ANNUAL SNOWFALL IS 57.3 INCHES.D.STORMWATER POLLUTION PREVENTION PLAN (SWPPP) IMPLEMENTATION RESPONSIBILITIES:1. THE OWNER AND CONTRACTOR ARE PERMITTEE(S) AS IDENTIFIED BY THE NPDES PERMIT.2. CONTRACTOR SHALL BE RESPONSIBLE FOR ALL ON-SITE IMPLEMENTATION OF THE SWPPP, INCLUDING THEACTIVITIES OF ALL OF CONTRACTOR'S SUBCONTRACTORS.3. CONTRACTOR SHALL PROVIDE A PERSON(S) KNOWLEDGEABLE AND EXPERIENCED IN THE APPLICATION OFEROSION PREVENTION AND SEDIMENT CONTROL BEST MANAGEMENT PRACTICES (BMP'S) TO OVERSEE ALLINSTALLATION AND MAINTENANCE OF BMP'S AND IMPLEMENTATION OF THE SWPPP.4. CONTRACTOR SHALL PROVIDE PERSON(S) MEETING THE TRAINING REQUIREMENTS OF THE NPDES PERMIT TOCONDUCT INSPECTIONS AND MAINTENANCE OF ALL EROSION PREVENTION AND SEDIMENT CONTROL BMP'S INACCORDANCE WITH THE REQUIREMENTS OF THE PERMIT. ONE OF THESE INDIVIDUAL(S) MUST BE AVAILABLE FORAN ON-SITE INSPECTION WITHIN 72 HOURS UPON REQUEST BY MPCA. CONTRACTOR SHALL PROVIDE TRAININGDOCUMENTATION FOR THESE INDIVIDUAL(S) AS REQUIRED BY THE NPDES PERMIT. THIS TRAININGDOCUMENTATION SHALL BE RECORDED IN OR WITH THE SWPPP BEFORE THE START OF CONSTRUCTION.E.STORMWATER DISCHARGE DESIGN REQUIREMENTSTHE FOLLOWING SIZING CRITERIA APPLY TO THE DESIGN OF STORMWATER TREATMENT FACILITIES. N/A INDICATESNOT APPLICABLE OR NOT CONSTRUCTED AS PART OF THIS PROJECT.1. TEMPORARY SEDIMENTATION BASINS: N/A2. PERMANENT WET SEDIMENTATION BASINS: N/A3. PERMANENT INFILTRATION/FILTRATION BMP: ONE (1) INFILTRATION BASIN.4. PERMANENT REGIONAL PONDS: N/A5. ALTERNATIVE METHODS: TWO (2) SUMP MANHOLES, TWO (2) UNDERGROUND INFILTRATION CHAMBERSYSTEMS.SEE SHEETS C-902, C-906 & C-907 FOR INFILTRATION BASIN & CHAMBER SYSTEM CROSS SECTION DETAILS,CONSTRUCTION NOTES AND DESIGN CALCULATIONS.E.SEQUENCE OF CONSTRUCTIONTHE FOLLOWING SEQUENCE DESCRIBES, IN GENERAL, THE WORK ON THE SITE:1. CONTRACTOR SHALL VERIFY THAT ALL PERMITS HAVE BEEN OBTAINED AND/OR OBTAIN THE NECESSARY PERMITS.2. CONTRACTOR SHALL PERFORM SITE INSPECTIONS, RECORD KEEPING AND RECORD RETENTION IN ACCORDANCEWITH ALL PERMITS3. CONTRACTOR SHALL PREPARE AND SUBMIT A WRITTEN, NOT ORAL, WEEKLY SCHEDULE OF PROPOSED EROSIONCONTROL ACTIVITIES FOR THE PROJECT ENGINEER'S AND OWNER'S REPRESENTATIVE'S APPROVAL.4. CONTRACTOR SHALL INSTALL ALL PERIMETER AND DOWN-GRADIENT EROSION CONTROL AND SEDIMENTCONTROL BMP'S, CONSTRUCTION ENTRANCES PRIOR TO SITE GRADING, EXCAVATION, STOCKPILING ORDISTURBING EXISTING VEGETATIVE COVER.5. CONTRACTOR SHALL PERFORM PHASE I DEMOLITION IN ACCORDANCE WITH THE DEMOLITION PLAN.6. CONTRACTOR SHALL PERFORM SITE GRADING, EXCAVATION, STOCKPILING WORK IN ACCORDANCE WITH THESTORMWATER POLLUTION PREVENTION PLAN (SWPPP).7. CONTRACTOR SHALL INSTALL, INSPECT, MONITOR AND MAINTAIN TEMPORARY AND PERMANENT EROSIONCONTROL BMPS AS SHOWN ON PLANS & IN CONFORMANCE WITH NPDES PERMIT EVERY 7 DAYS AND WITHIN 24HOURS FOLLWING A 0.50 INCH OVER 24 HOUR RAIN EVENT DURING ACTIVE CONSTRUCTION.8. CONTRACTOR MUST INITIATE SOIL STABILIZATION METHODS IMMEDIATELY FOLLOWING SOIL AND/ORVEGETATION DISTURBANCE ACTIVITIES AND MUST BE COMPLETED NO LATER THAN 7 DAYS AFTER CONSTRUCTIONACTIVITY HAS CEASED.9. CONTRACTOR SHALL REPLACE OR REPAIR EROSION CONTROL AND SEDIMENT CONTROL BMP'S THAT ARE NOTFUNCTIONING PROPERLY WITHIN 24 HOURS OF A STORM EVENT OF AT LEAST 0.50 INCHES.10. CONTRACTOR SHALL PERFORM PHASE II DEMOLITION IN ACCORDANCE WITHE THE DEMOLITION PLAN.CONTRACTOR SHALL PERFORM ITEMS 6-9 FOR AREAS BOUND BY PHASE II DEMOLITION WORK, AND FOR ANYREMAINING WORK WITHIN THE CONSTRUCTION BOUNDARIES.11. CONTRACTOR SHALL PERFORM SITE RESTORATION ACTIVITIES FOR PERMANENT VEGETATIVE ESTABLISHMENT.12. CONTRACTOR SHALL REMOVE SEDIMENT CONTROL DEVICES PRIOR TO SUBMITTING NOTICE OF TERMINATION(NOT).13. SUBMIT NOT TO MPCA WITHIN 30 DAYS OF FINAL STABILIZATION.F.CONSTRUCTION ACTIVITY FIELD REQUIREMENTS:ALL FIELD REQUIREMENTS SHALL BE PERFORMED IN ACCORDANCE WITH THE REQUIREMENTS OF THE NPDES PERMITAND STORMWATER POLLUTION PREVENTION PLAN (SWPPP).1. THE CONTRACTOR MUST IMPLEMENT THE SWPPP AND PROVIDE BMPs IDENTIFIED IN THE SWPPP IN ANAPPROPRIATE AND FUNCTIONAL MANNER.2. THE CONTRACTOR MUST PRESERVE A 50 FOOT NATURAL BUFFER FROM ADJACENT SURFACE WATERS.3. THE CONTRACTOR SHALL RESPOND TO CHANGING SITE CONDITIONS AND IMPLEMENT/SUPPLEMENT EROSIONPREVENTION AND SEDIMENT CONTROL MEASURES UTILIZED TO PROVIDE ADEQUATE PROTECTION OF DISTURBEDSOILS AND ADEQUATE PREVENTION OF SEDIMENT TRANSPORT OFF-SITE. AT A MINIMUM, THE FOLLOWINGSTORM WATER POLLUTION PREVENTION CONSTRUCTION ACTIVITY FIELD REQUIREMENTS SHALL BE FURNISHED BYTHE CONTRACTOR.4. THE CONTRACTOR SHALL TAKE CAUTION TO MINIMIZE COMPACTION OF SOILS AND RESTRICT VEHICLE ANDEQUIPMENT USE IN INFILTRATION/FILTRATION BMP AREAS, AND AREAS WHERE FULL VEGETATIVE STABILIZATIONWILL OCCUR.5. AREAS OF COMPACTION SHALL BE UNCOMPACTED TO A DEPTH OF 18 INCHES BEFORE THE PLACEMENT OFTOPSOIL.G.EROSION PREVENTION PRACTICESCONTRACTOR SHALL BE RESPONSIBLE FOR THE FOLLOWING EROSION PREVENTION PRACTICES:1. THE CONTRACTOR SHALL ATTEMPT TO PHASE ALL WORK TO MINIMIZE EROSION AND MAINTAIN VEGETATIVECOVER TO THE EXTENT POSSIBLE. THE LOCATION OF AREAS NOT TO BE DISTURBED MUST BE DELINEATED ON THESITE BEFORE CONSTRUCTION BEGINS.2. INLET PROTECTION, SILT FENCE, ROCK LOGS, AND ROCK CONSTRUCTION ENTRANCES SHALL BE INSTALLED ATLOCATIONS SHOWN ON THE EROSION CONTROL PLAN DRAWING, OR AS MODIFIED IN THE FIELD BY THEENGINEER.3. INLET PROTECTION FOR OFF SITE DRAIN INLETS NOT SHOWN IN THE EROSION CONTROL PLAN WILL BE INSTALLEDAS NEEDED.4. ALL EXPOSED SOILS MUST BE STABILIZED IMMEDIATELY OR NO LATER THAN 7 DAYS AFTER THE CONSTRUCTIONACTIVITY IN THAT PORTION OF THE SITE HAS TEMPORARILY OR PERMANENTLY CEASED, INCLUDING STOCKPILESWITH SIGNIFICANT SILT, CLAY OR ORGANIC COMPONENTS.5. THE NORMAL WETTED PERIMETER OF ANY TEMPORARY OR PERMANENT DRAINAGE DITCH THAT DRAINS WATERFROM A CONSTRUCTION SITE OR DIVERTS WATER AROUND A SITE MUST BE STABILIZED BY CONTRACTOR WITHIN200 FEET FROM THE PROPERTY EDGE, OR FROM THE POINT OF DISCHARGE TO ANY SURFACE WATER WITHIN 24HOURS OF CONNECTING TO A SURFACE WATER. TEMPORARY OR PERMANENT DITCH SWALES BEING USED AS ASEDIMENT CONTAINMENT SYSTEM DO NOT NEED TO BE STABILIZED UNTIL THEY ARE NO LONGER USED AS ASEDIMENT CONTAINMENT SYSTEM, AFTER WHICH THEY MUST BE STABILIZED WITHIN 24 HOURS.6. TEMPORARY OR PERMANENT ENERGY DISSIPATION AT PIPE OUTLETS MUST BE PROVIDED WITHIN 24 HOURS OFCONNECTING TO A SURFACE WATER.7. ALL EXPOSED SOIL AREAS WILL BE STABILIZED PRIOR TO THE ONSET OF WINTER. ANY WORK STILL BEINGPERFORMED WILL BE SNOW MULCHED OR SNOW BLANKETED AND SNOW SEEDED.H.SEDIMENT CONTROL PRACTICESCONTRACTOR SHALL BE RESPONSIBLE FOR THE FOLLOWING SEDIMENT CONTROL PRACTICES:1. CONTRACTOR MUST INSTALL ALL DOWN GRADIENT PERIMETER CONTROLS BEFORE ANY UP GRADIENTDISTURBANCE BEGINS. CONTRACTOR SHALL MAINTAIN PERIMETER CONTROLS UNTIL FINAL STABILIZATION.2. CONTRACTOR SHALL PROVIDE GRADING AND BMP INSTALLATION TO LIMIT ALL SLOPES OF 3H:1V OR STEEPER TOAN UNBROKEN LENGTH OF 75 FEET OR LESS.3. TIMING AND INSTALLATION OF SEDIMENT CONTROL DEVICES CAN BE ADJUSTED BY CONTRACTOR TOACCOMMODATE SHORT-TERM ACTIVITIES SUCH AS CLEARING AND GRUBBING OR VEHICLE PASSAGE. ANYSHORT-TERM ACTIVITY MUST BE COMPLETED AS QUICKLY AS POSSIBLE AND THE SEDIMENT CONTROL PRACTICESMUST BE INSTALLED IMMEDIATELY AFTER THE ACTIVITY IS COMPLETED AND IN ALL CASES PRIOR TO THE NEXTPRECIPITATION EVENT.4. IF PRESENT, ALL STORM SEWER INLETS AND OUTLETS SHALL BE PROTECTED BY CONTRACTOR WITH APPROPRIATEBMP'S DURING THE WORK. THESE PRACTICES SHALL REMAIN IN PLACE UNTIL THE POTENTIAL SOURCES FORDISCHARGING SEDIMENT TO INLETS HAVE BEEN STABILIZED BY CONTRACTOR.5. TEMPORARY SOIL STOCKPILES MUST HAVE SILT FENCE OR OTHER EFFECTIVE SEDIMENT CONTROLS. SOILSTOCKPILES SHALL NOT BE PLACED WITHIN SURFACE WATERS OR STORMWATER CONVEYANCES. CONTRACTORSHALL INSTALL SILT FENCE PROTECTION AROUND THE LIMITS OF ALL TEMPORARY SOIL STOCKPILE AREAS. ALLSOIL STOCKPILES THAT REMAIN UNDISTURBED FOR A PERIOD GREATER THAN 48 HOURS SHALL BE PROTECTED BYCONTRACTOR WITH COVER OF MULCH, EROSION CONTROL MATS, OR PLASTIC SHEETING.6. CONTRACTOR SHALL IMPLEMENT MEASURES TO CONTROL VEHICLE TRACKING OFF SITE. ROCK CONSTRUCTIONENTRANCES OR EQUIVALENT SYSTEM MUST BE INSTALLED BY CONTRACTOR TO MINIMIZE TRACKING FROM SITE.7. CONTRACTOR SHALL PROVIDE TEMPORARY SEDIMENTATION BASINS AS REQUIRED BY THE PERMIT.8. CONTRACTOR SHALL REMOVE ALL SOIL AND SEDIMENT TRACKED OR OTHERWISE DEPOSITED ON PUBLIC ORPRIVATE PAVEMENT AREAS. REMOVE SOIL AND SEDIMENT ON A DAILY BASIS. STREET WASHING IS ONLY ALLOWEDAFTER SWEEPING SEDIMENT FROM THE AREAS.9. CONTRACTOR SHALL KEEP THE SURFACE OF ANY AND ALL CONSTRUCTION WORK AREAS AND HAUL ROADS MOISTBY SPRAYING WITH UNCONTAMINATED WATER AS TO PREVENT AIRBORNE DUST FROM LEAVING THE SITE. THISMAY INCLUDE SPRAYING AND SWEEPING FINISHED SURFACES ADJACENT TO THE PEDESTRIAN TRAFFIC, VEHICLETRAFFIC, AND PRIVATE AND PUBLIC PROPERTIES.THIS RESPONSIBILITY SHALL REQUIRE CONTRACTOR TO SUSPENDCONSTRUCTION OR HAUL TRAFFIC UNTIL SUCH TIME AS CONTRACTOR CAN AND DOES PREVENT AIRBORNE DUST.CONTRACTOR SHALL NOT OVER SPRAY SO AS TO CREATE PROBLEMS, SUCH AS TRACKING OF MATERIAL ONTOPAVED SURFACES, OR MUDDY HAUL ROADS, DUE TO THE APPLICATION OF EXCESS MOISTURE.10. CONTRACTOR SHALL TREAT ANY SEDIMENT LADEN WATER WITH APPROPRIATE SEDIMENT CONTAINMENT ORFILTER SYSTEM BEFORE DISCHARGING TO THE DOWNSTREAM SYSTEM.11. INFILTRATION BASIN PERIMETER CONTROL AND EROSION CONTROL PRACTICES SHALL REMAIN IN PLACE UNTILTHE FINAL COMPLETION OF THE PROJECT OR VEGETATION HAS BEEN ESTABLISHED, WHICHEVER IS LATER.12. INSTALLATION OF INFILTRATION/FILTRATION PRACTICES SHALL BE DONE DURING PERIODS OF DRY WEATHER ANDCOMPLETED BEFORE A RAINFALL EVENT.13. EXCAVATION OF INFILTRATION AREAS SHALL BE COMPLETED USING A BACKHOE WITH A TOOTHED BUCKET.14. SOILS IN THE INFILTRATION AREAS SHALL BE LOOSENED UP TO A MINIMUM OF 18" IN DEPTH.15. THE BOTTOM EXCAVATION SURFACE OF THE INFILTRATION AREAS SHALL BE LEVEL WITHOUT DIPS OR SWALES.16. DURING CONSTRUCTION OF THE INFILTRATION AREAS, STORMWATER MUST BE ROUTED AROUND THE AREASUNTIL ALL CONSTRUCTION ACTIVITY HAS CEASED AND THE TRIBUTARY SURFACES ARE CLEANED OF SEDIMENT.17. THE ENGINEERED SOILS WITH IN THE INFILTRATION AREAS SHALL REMAIN UNCONTAMINATED BEFORE ANDDURING INSTALLATION .18. POLYMERS, FLOCCULANTS, OR OTHER SEDIMENTATION TREATMENT CHEMICALS MUST BE USED IN ACCORDANCEWITH ACCEPTED ENGINEERING PRACTICES, DOSING SPECIFICATIONS AND SEDIMENT REMOVAL DESIGNSPECIFICATIONS PROVIDED BY THE MANUFACTURER OR SUPPLIER. THE PERMITTEES MUST USE CONVENTIONALEROSION AND SEDIMENT CONTROLS PRIOR TO CHEMICAL ADDITION AND MUST DIRECT TREATED STORMWATERTO A SEDIMENT CONTROL SYSTEM FOR FILTRATION OR SETTLEMENT OF THE FLOC PRIOR TO DISCHARGE.I.POLLUTION PREVENTION MEASURESCONTRACTOR SHALL BE RESPONSIBLE FOR IMPLEMENTING THE FOLLOWING POLLUTION MANAGEMENT MEASURESON THE SITE:1. BUILDING PRODUCTS AND LANDSCAPE MATERIALS UNDER COVER (E.G., PLASTIC SHEETING OR TEMPORARYROOFS) OR PROTECT THEM BY SIMILARLY EFFECTIVE MEANS DESIGNED TO MINIMIZE CONTACT WITHSTORMWATER. PERMITTEES ARE NOT REQUIRED TO COVER OR PROTECT PRODUCTS WHICH ARE EITHER NOT ASOURCE OF CONTAMINATION TO STORMWATER OR ARE DESIGNED TO BE EXPOSED TO STORMWATER.2. SOLID WASTE: COLLECTED SEDIMENT, ASPHALT, 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 IN SECTION 12.5 OF THE GENERAL PERMIT.3. PERMITTEES MUST POSITION PORTABLE TOILETS SO THEY ARE SECURE AND WILL NOT TIP OR BE KNOCKED OVER.PERMITTEES MUST PROPERLY DISPOSE SANITARY WASTE IN ACCORDANCE WITH MINN. R. CH. 7041.4. HAZARDOUS MATERIALS: OIL, GASOLINE, PAINT AND ANY HAZARDOUS SUBSTANCES MUST BE STORED INAPPROPRIATE CONTAINERS. INCLUDING SECONDARY CONTAINMENT TO PREVENT SPILLS, LEAKS OR OTHERDISCHARGES. RESTRICTED ACCESS TO STORAGE AREAS MUST BE PROVIDED TO PREVENT VANDALISM. STORAGEAND DISPOSAL OF HAZARDOUS WASTE MUST COMPLY WITH MPCA REGULATIONS, SEE SECTION 12.4 OF THEGENERAL PERMIT.5. PESTICIDES, FERTILIZERS AND TREATMENT CHEMICALS MUST BE PLACED UNDER COVER (PLASTIC SHEETING ORTEMPORARY ROOFS, ETC.) OR PROTECT THEM BY SIMILARLY EFFECTIVE MEANS DESIGNED TO MINIMIZE CONTACTWITH STORMWATER.6. A DEFINED AREA OF THE SITE MUST BE DESIGNATED FOR USE AS A WASH AREA FOR TRUCKS AND OTHEREQUIPMENT. NO ENGINE DEGREASING IS ALLOWED ON SITE.7. CONCRETE WASHOUT CONTAINMENT SHALL BE PROVIDED ON SITE. THE CONTAINMENT METHOD MUST BELEAK-PROOF WITH AN IMPERMEABLE LINER. OR ALTERNATIVELY, CONCRETE WASHOUT SHALL BE PERFORMED ATTHE CONCRETE MIX PLANT INSTEAD OF ON-SITE.8. ANY FUEL OR CHEMICAL TANK STORAGE ON THE PROJECT AREA MUST BE PROTECTED BY A SOIL BERM OR HAVE ANEGATIVE GRADIENT TO ANY WATER RESOURCE AREA. A CONTINGENCY PLAN MUST BE CREATED BY THECONTRACTOR IN THE EVENT OF A SPILL OR LEAK OF ANY CHEMICAL, INCLUDING PETROCHEMICALS, DEEMEDHARMFUL TO THE ENVIRONMENT, AND HAVE ON HAND THE MATERIALS NECESSARY TO CAPTURE AND CONTAINSAID CHEMICALS.9. PERMITTEES MUST TAKE REASONABLE STEPS TO PREVENT THE DISCHARGE OF SPILLED OR LEAKED CHEMICALS,INCLUDING FUEL, FROM ANY AREA WHERE CHEMICALS OR FUEL WILL BE LOADED OR UNLOADED INCLUDING THEUSE OF DRIP PANS OR ABSORBENTS UNLESS INFEASIBLE. PERMITTEES MUST ENSURE ADEQUATE SUPPLIES AREAVAILABLE AT ALL TIMES TO CLEAN UP DISCHARGED MATERIALS AND THAT AN APPROPRIATE DISPOSAL METHODIS AVAILABLE FOR RECOVERED SPILLED MATERIALS. PERMITTEES MUST REPORT AND CLEAN UP SPILLSIMMEDIATELY AS REQUIRED BY MINN. STAT. 115.061, USING DRY CLEAN UP MEASURES WHERE POSSIBLE.J.DEWATERING AND BASIN DRAININGALLOWABLE NON-STORMWATER DISCHARGES, AS DEFINED BY THE GENERAL PERMIT, ARE LIMITED TO DEWATERINGAND BASIN DRAINING. DEWATERING OR BASIN DRAINING THAT MAY HAVE TURBID OR SEDIMENT LADEN DISCHARGEWATER MUST BE DISCHARGED TO A TEMPORARY OR PERMANENT SEDIMENTATION BASIN ON THE PROJECT SITEWHENEVER POSSIBLE. IF THE WATER CANNOT BE DISCHARGED TO A SEDIMENTATION BASIN PRIOR TO ENTERING THESURFACE WATER, IT MUST BE TREATED WITH THE APPROPRIATE BMPS, SUCH THAT THE DISCHARGE DOES NOTADVERSELY AFFECT THE RECEIVING WATER OR DOWNSTREAM LANDOWNERS. THE CONTRACTOR MUST ENSURETHAT DISCHARGE POINTS DISPERSED OVER NATURAL ROCK RIPRAP, SAND BAGS, PLASTIC SHEETING OR OTHERACCEPTED ENERGY DISSIPATION MEASURES. ADEQUATE SEDIMENTATION CONTROL MEASURES ARE REQUIRED FRODISCHARGE WATER THAT CONTAINS SUSPENDED SOLIDS. ALL WATER FROM DEWATERING OR BASIN DRAINING MUSTBE DISCHARGED IN A MANNER THAT DOES NOT CAUSE NUISANCE CONDITIONS, EROSION IN RECEIVING CHANNELSOR ON DOWNSLOPE PROPERTIES, OR INUNDATION IN WETLANDS CAUSING SIGNIFICANT ADVERSE IMPACT TO THEWETLAND. IF THE CONTRACTOR ELECTS TO UTILIZE FILTERS WITH BACKWASH WATER, THE CONTRACTOR MUST HAULTHE BACKWASH WATER AWAY FOR DISPOSAL, RETURN THE BACKWATER TO THE BEGINNING OF THE TREATMENTPROCESS, OR INCORPORATE THE BACKWASH WATER INTO THE SITE IN A MANNER THAT DOES NOT CAUSE EROSION.THE CONTRACTOR MUST REPLACE AND CLEAN THE FILTER MEDIA USED IN DEWATERING DEVICES WHEN REQUIREDTO RETAIN ADEQUATE FUNCTION. CONTRACTOR SHALL OBTAIN A WATER USE (APPROPRIATION) PERMIT FROM THEMN DNR FOR DEWATERING ACTIVITIES THAT WILL WITHDRAW MORE THAN 10,000 GALLONS OF WATER PER DAY OR1 MILLION GALLONS PER YEAR.BJLSTORMWATER POLLUTION PREVENTION PLAN (SWPPP) NARRATIVE (1/2) - LITTLE CANADA DEVELOPMENTLITTLE CANADA, MN
<br />LITTLE CANADA DEVELOPMENT
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