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• Transfer/Processing Report Tracy Material Recovery and Transfer Facility 30703 5. MacArthur Drive, Tracy, California 95377 Drainage Control Surface water runoff, including all process water, will be directed to a onsite retention basin by use of grading design and drainage ditches, where it will be properly treated, if necessary, to eliminate potential environmental impacts. Water will be pumped from the retention basin for facility use in operations, including fire and dust control. The retention basin has been designed to retain all surface water runoff resulting from a 100 -year, 24-hour storm event. Site personnel will regularly inspect and maintain the drainage ditches and basin. The operator implements Best Management Practices (BMPs). BMPs included in the site's Storm Water Pollution Prevention Plan (SWPPP) include such management practices as required of the National Pollution Discharge Elimination System (NPDES): • Storing recycled materials on a slightly sloping paved area (to prevent ponding) with a drainage system. Prevent run-on and runoff by directing drainage around storage areas. • Sweeping parking areas, storage areas, and processing areas regularly to remove fine particles of material and dust. • Storing household hazardous materials from the load checking program in an approved household hazardous materials storage compartment and in accordance with federal, state, and local requirements. • Conducting all vehicle maintenance within the existing maintenance shop at the facility. • Spill prevention, control, and cleanup program • Training employees in implementation of BMPs The amount of free liquids expected to be generated from solid waste transferring activities within the fully enclosed transfer station are minimal, even during inclement weather. As a preventative measure, the concrete slab within the MRF/TS building has been slightly concaved to pond any free liquid on the tipping pad where drier solid waste can absorb the liquids as the solid waste is processed for transferring into the loading bays. Should liquids become excessive, chipped green waste from the compost operations can be applied to the tipping pad area to absorb the liquids. The materials would then be transported off-site for disposal at a permitted solid waste facility. The Tracy MRF & TS is designed in a manner that rain water that falls on the building will be treated as storm water and be disposed of in the storm water system. Storm water generated by rainfall in the ramp to the covered loading bays will be managed as storm water as grated trench drains will be put in place to not have this storm water come in contact with any solid waste within the covered 26