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PC: 9-6-90 QX-90-1 available for recycling would be that used for dust control at the quarry site and along the haul route between the existing quarry and the processing facility. Sewage Disposal : Chemical toilet facilities are used at the processing facility; therefore, no wastewater (i . e. , domestic sewage) is generated from the existing operations . Water used in resource processing is recycled through a series of settling ponds . Storm Drainage: On-site drainage of the area to be excavated is currently provided by a single grass-lined ditch located along the base of the bluffs roughly located on the west, south and east boundaries of the site. This drainage terminates as a small pond on the site. Adjacent to the drainage ditch, on the southeastern boundary of the proposed quarry site, is the Clements Drainage Pond, which serves as a flood control structure for a portion of the town of Clements . The pond, owned by San Joaquin County, is designed to retain runoff from the ten-year storm event and allows percolation to groundwater. Drainage for the processing facility is provided by nearby settling ponds and will remain so during future operations . Future storm drainage for the excavation area will be provided by a retention/percolation basin that will provide sufficient water storage capacity to allow percolation of surface water to the aquifer in the area of the proposed quarry excavation. Calculations for sizing the retention basin indicate a ten- acre, two-foot-deep pond will provide sufficient water storage capacity for a ten-year storm event. The pond will be adequately sized to prevent overfilling the pond and flooding of the site or discharge of water to the Mokelumne River. ENVIRONMENTAL CONSIDERATIONS: Initial Study and Environmental Impact Report: The Initial Study that was prepared on January 30 , 1990 , indicated that the proposed project could potentially have a significant, negative impact on the local environment. On the basis of that determination, an Environmental Impact Report (EIR) was prepared for the project by Harding Lawson -33-