2023-10-31_REVISION - M1973021 (10)

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STORMWATER MANAGEMENT PLAN MORRISON QUARRY REVISION NO.8 1 August 2022 CERTIFICATION NO.COG500320 the various levels of containment. Please see the facility's SPCC Plan for more details on containment and fuel storage. 3.1.5 TRUCK WHEEL WASH AND SCALES The truck wheel wash area is located at the eastern portion of the facility. Upon exiting the facility, trucks must drive over a wheel wash. The water from this system is re- circulated and recycled within the system. Water dripping off truck tires is then collected in a sump right before the scales. This water drains into the retention basin and is co-mingled with any stormwater that may be in the basin. The water is held until it evaporates or is high enough to flow through the orifice plate and discharges through a culvert underground. Potential pollutants associated with the truck wheel wash area include fuels and oils from the vehicles, and sediment that accumulates on trucks while driving. The potential for pollutants to enter stormwater from the truck wheel wash area and is moderate since any stormwater from the haul roads comingles with water dripping off truck tires in the retention basin. 3.1.6 LOADING AND UNLOADING AREAS Loading and unloading of aggregate and silos occur within the aggregate stockpile area and plant.There is some potential for some aggregate to come in contact with stormwater in high intensity or long duration precipitation events; however, it is unlikely that loading and unloading activities will impact stormwater. There is low potential for pollutants to enter stormwater since stormwater in the plant area is either retained onside or is directed to the stormwater/process water retention basin. 3.1.7 DUST AND PARTICULATE GENERATING PROCESSES (ACTIVE MINING AREAS AND HAUL ROADS) Stripping overburden and blasting are particulate generating processes conducted onsite. The mine's high walls are blasted on a regular schedule and loaded into haul trucks. Potential pollutants associated with these processes include sediment from the aggregate and sediment from the haul roads in the active mining areas. There is moderate potential for pollutants to enter stormwater since some erosion occurs along the sides of haul roads. However, the site constructs check dams as necessary to reduce erosion from haul roads and active mining areas. Additionally, most stormwater is directed to the retention basin before being discharge offsite. 15