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STORMWATER MANAGEMENT PLAN MORRISON QUARRY <br /> REVISION NO.8 1 August 2022 CERTIFICATION NO.COG500320 <br /> Material is also stockpiled in the middle of the quarry and is processed for riprap. <br /> Stormwater from this area would travel down the haul road and discharge at Outfall <br /> 003 or Outfall 005. <br /> Potential pollutants associated with the aggregate stockpile area included <br /> suspended solids from sand and gravel. The potential for pollutants to enter <br /> stormwater is low since water that may come into contact with the stockpiles typically <br /> stays onsite and slowly infiltrates into the ground or evaporates. Should stormwater <br /> discharge, check dams are located along the haul road to act as a BMP before the <br /> water discharges. <br /> 3.1.3 MATERIAL STORAGE AREA <br /> The material storage area is located inside the shop, and inside a storage trailer next <br /> to the shop. Drums of various grease and oil are stored inside the inside the shop or <br /> storage trailer on spill pallets to prevent drips or leaks from accumulating on the floor. <br /> The shop utilizes a parts washer and conducts maintenance on equipment. <br /> Miscellaneous parts are stored inside the shop. The shop has a concrete floor. The <br /> outside surface of this area is comprised of gravel. <br /> Potential pollutants associated with the material storage area include fuels, oils and <br /> antifreeze. The potential for pollutants to enter stormwater is low since materials are <br /> stored inside containment, inside the plant or inside a trailer. Any spill of petroleum <br /> products would be immediately stopped and cleaned up per the spill response <br /> procedures in the facility's Spill Prevention Control and Countermeasure (SPCC) Plan. <br /> 3.1.4 VEHICLE MAINTENANCE AND FUEL STORAGE AREA <br /> Vehicle maintenance is completed onsite near the fuel storage area. Any small <br /> amounts of used oil generated from vehicles is kept in a used oil tank inside <br /> containment and emptied by a used oil recycling vendor. The vehicle fueling is <br /> routinely inspected for spills and leaks as required in the facility's SPCC Plan. Spill kits <br /> are available onsite for any spills that may occur. The facility procedures for fueling <br /> are included in training guidance and are reviewed in the annual training classes. <br /> The fuel storage area at this facility includes a 10,000 gallon off-road diesel tank, a 500 <br /> gallon on-road diesel tank, a 500 gallon gasoline tank, a 2,000 gallon used oil tank, <br /> three 400 gallon motor oil tanks, a 400 gallon antifreeze tank, and a few 55 gallon <br /> grease drums. <br /> The diesel, gasoline and used oil tanks are inside a covered concrete containment <br /> area. The motor oil tanks, antifreeze tank and grease drums are located inside an <br /> epoxy lined storage shed. Any spills from drums would be contained onsite. The <br /> potential to contribute pollutants to stormwater in the fuel storage areas is low due to <br /> 14 <br />