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n 0 �7 • Interfere substantially with ground water recharge. • Degrade the quality of water in artificial water -carrying structures. Cause siltation from erosion. The analysis of potential effects includes consideration of mitigation measures for compliance with water pollution control, spill control and reclamation measures. Impact 4.5-1 Surface water contamination may occur from discharge of surface waters or storm water which has become contaminated. During project development, surface water quality may be affected by runoff from grading activities during construction. Grading activities uncover and loosen soils, allowing silts and clays to be readily carried by runoff waters and deposited elsewhere. Impact to surface water may occur as a result of contamination of runoff from paved areas used for truck access. Contaminants in runoff from paved areas would be petroleum hydrocarbons, oil, grease, antifreeze and solids (including heavy metals). Potential sources for storm water contamination on the site include roads and parking areas where storm runoff may contact automotive pollutants such as oil, grease, heavy metals, and suspended solids: recycling, storage, and any other processing areas where storm runoff may contact refuse, recycled, or other recoverable materials; and truck wash and maintenance areas where rinse water, equipment fuels, and lubricants could mingle with storm runoff. Additional contaminants may result from the "collection vehicle maintenance and operations facility for the Tracy Disposal Solid Waste Management, Inc. (TDSWM) to be included as part of the project" as described in the "Project Description for Tracy Materials Recovery and Transfer Facility, Inc., San Joaquin County" (EBA, 1993). As the facility is to be sited within a pit, there is no point at which surface water flows can leave the site. Storm water may be discharged to waters of the State United States under the terms of as indi istrial Storm Water Permit - inder the St= Geperal Permit the California General Storm Water Permit. If storm water becomes contaminated with any process water from the site, including wash water from the tipping floor or truck wash, an NPDES Permit will be required for any discharge to off site water courses. Both permits require regular testing of the retention/drainage pond, to ensure that storm water discharged to the pond does not contain contaminants. All mitigation measures required by the NPDES and the State General Permit will be implemented. Any storm water discharge during the construction phase must comply with the requirements of the RIA10CR California General Storm Water Permit and local ordinance. Storm runoff from any other surface areas during the operation of the proposed project should be discharged in compliance with the State General Industrial Storm Water Permit. ■ Mitigation 4.5-1 During construction, runoff from disturbed areas should be routed to on-site sedimentation ponds and detained, allowing suspended sediment to settle out as described in the California General Storm Water Permit. Off site storm water and sheet flow runoff should be intercepted and prevented from flowing onto the site, by diversion around the site perimeter. ER -93-1 -68- (9-27-93)