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STORMWATER MANAGEMENT PLAN MORRISON QUARRY <br /> REVISION NO.8 1 August 2022 CERTIFICATION NO.COG500320 <br /> 4.3 PREVENTATIVE MAINTENANCE <br /> Preventative maintenance documentation is kept in the facility's Monthly Environmental <br /> Inspections Binder. Preventative maintenance is used to: <br /> • Reduce leaks and other releases from vehicles, machines and equipment that can <br /> come into contact with precipitation or stormwater runoff. <br /> • Maintain the effectiveness of other control measures such as the structural control <br /> measures defined in Section 4.6. <br /> 4.4 SPILL PREVENTION AND RESPONSE <br /> The facility has developed and implemented a site-specific Spill SPCC Plan, and uses <br /> appropriate procedures to reduce the likelihood of the release of contaminates to <br /> stormwater(s) and to respond to a significant release of pollutants. <br /> The SPCC Plan for the facility, if required, is a separate document and is available at the <br /> facility. The SPCC Plan includes site-specific provisions for spill prevention, emergency <br /> response, spill notification, and cleanup in the event of a release at the facility. The <br /> information provided in the SPCC Plan is incorporated by reference into this SWMP. <br /> 4.5 EROSION AND SEDIMENT CONTROLS <br /> There is high potential for erosion at this facility since the site is graveled and the sloping <br /> is relatively steep. The retention ponds and check dams onsite act as sediment control <br /> since the ponds hold any stormwater associated industrials materials onsite and process <br /> water, and allow stormwater to settle before discharge and check dams prevents <br /> erosion as water travels through the site. <br /> 4.6 MANAGEMENT OF RUNOFF <br /> Runoff is managed using the following structural controls: <br /> • Site Grading -The site is graded in such a way that all stormwater flows are allowed <br /> to either be trapped onsite where it will infiltrate and/or evaporate or it is directed to <br /> one of the retention ponds and/or the current mining pit where it may or may not be <br /> allowed to discharged through one of the permitted discharge points. <br /> • Berms- Earth berms are used throughout the site along the perimeters as a measure <br /> to contain stormwater within the site perimeter. <br /> • Stormwater Retention Ponds - These ponds collect stormwater from primarily the <br /> northern and eastern portions of the property. However, in large storm events, the <br /> ponds collect water from the majority of the site. These ponds allow stormwater to <br /> 18 <br />