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_ dust control watering of roadways. Thus the potential spread of airborne dust outside of <br /> containment and control areas is minimised. <br /> 4.3 Offices & Vehicle Maintenance Shop Runoff Controls <br /> Drainage control in the vicinity of the office/shop building and truck scales consists of a flat- <br /> graded pad area sloping to a catchment basin at the northeast corner of the area. The <br /> catchment basin is designed to accommodate storm water runoff from the roadway and <br /> adjacent areas only. Storm water coming into contact with the wash area is directed towards <br /> the sand and grease trap which is a part of the wash area system. Figure 4 shows the <br /> location and nature of storm water control features. <br /> Lubricants, hydraulic oil and other potential contaminant sources associated with vehicle <br /> maintenance will be used and stored inside of the vehicle maintenance shop thus eliminating <br /> the potential for contact with storm water. Handling and disposal of virgin and waste <br /> materials in the maintenance shop as described in Section 5.6.3 will also minimize the <br /> potential for impact of storm water runoff. <br /> Vehicles and equipment used in operations at the site will be washed periodically to <br /> minimize dust and lubricant buildup. A wash area, consisting of a concrete slab, sand and <br /> grease trap, and holding tank, are situated adjacent to the shop building and will <br /> accommodate wash operations. Storm water coming into contact with the slab will enter the <br /> trap and holding tank. These operations are addressed under Waste Discharge <br /> Requirements issued by the California Central Valley Regional Water Quality Control <br /> Board. <br /> Materials in the truck loading and scale area that have a potential to impact storm water <br /> runoff are limited to finished aggregate products from the facility. <br /> 4.4 Boneyard Area Runoff Controls <br /> Runoff and drainage controls are not required in the Boneyard area. <br /> 4.5 Pristine and Reclaimed Area Runoff Controls <br /> Runoff and drainage controls are not required in pristine and reclaimed areas. <br /> 5.0 STORM WATER MANAGEMENT CONTROLS <br /> KRC Aggregate, Inc. will maintain appropriate storm water management controls at the <br /> subject facility so as to prevent discharge of storm water to waters of the United States and <br /> Storm Water Managmant Plan-BRC AUrapm Inc <br /> BSB Pm*d Na 927012 7 <br /> Rc .d J...M M4 <br />