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11 Storm water precipitation failing onto the site should be prevented from flowing from the site, and should be retained on site in an unlined drainage basin. The drain-a9e A W FG-t2iA thO xPoGted UOM a I 1111 -year OA Storm water runoff from all areas except the compost pad should drain to this on-site retention pond. Runoff should be collected via surface swales and ditches and an underground storm drainage system. The storm drainage system itself will be designed for the 10-year/24-hour rainstorm event. San Joaquin County Design Standards pertaining to storm water retention ponds require that the retention pond be sized to contain 200 percent of the computed volume of runoff from the 1 0-vear/24-hour storm. In addition, the gond will be designed to empty by percolation and evaporation 100 percent of the required volume of storage within 10 days. The unlined drainage basin should have no contact with refuse, compost, or recycled materials. The drainage basin should be designed for percolation and/or pumping to existing drainage facilities (ditch, creek, or channel). Leachate runoff and storm water from the compost pad will drain to an on-site lined evaporation pond. Drainage control systems around the compost pad (for storm water and leachate) will be designed forthe 25-year/24-hour rainstorm event. The lined evaporation pond has been designed to contain and collect estimated precipitation from the 100-year/24-hour rainstorm event. All drainage structures should be inspected and maintained on a regular basis. If overfilling or erosion damage occurs, the drainage structures should immediately be restored and enlarged as required. The evaporation/collection pond for surface runoff from the active working areas shall be lined. All surface areas involved in the transporting, processing, or storage of wastes shall be paved or lined and drained to an appropriate catchment facility to prevent contaminated runoff from entering the surface and ground water. Paved surfaces and liner systems shall be designed to prevent contamination to the underlying ground water. To prevent contamination of storm water from the project's main operations (refuse processing, material sorting/recovery, truck wash, maintenance activities), the proposed receiving and processing operations shall take place within covered and paved structures. The OUtdoor wood be- line- d and yaFd waste Gomposting aFea shall aAdjor Goptamination of surface Miater, The composting activities will take place on a concrete composting pad, with a storm water and leachate collection system draining to a lined evaporation pond. Runoff from the wood storage area will drain to the same pond. Yard and wood waste may be left uncovered. All buildings shall be constructed such that storm runoff shall not enter and come into contact with waste or recovered materials. Any liquids leached from the received wastes shall be contained within the building or in the yard area, and directed to holding tanks for monitoring and for separation of solids, oil and grease, before being pumped into the lined evaporation pond. Floor drains connected to catch basins shall be installed in all sorting and recovery buildings to collect liquids which may be generated from wastes, the separation process, or equipment maintenance. Required floor drains shall be plumbed through a sand/oil separator and discharged to an above -ground system approved by the Environmental Health Division. This system shall be designed by a registered engineer. The liquids recovered shall be contained on site in a lined evaporation pond, and/or pumped into trucks for appropriate disposal in accordance with Federal, State, and local requirements. The liquids recovered shall be analyzed for any hazardous constituents, per specific test requirements to be provided by the Environmental Health Division. Areas containing equipment shall be curbed to contain petroleum product and hydraulic fluid leaks. Truck washing areas shall be equipped with trench drains to collect the waste water. I ER -93-1 - 69 - (9-27-93) 1