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4. DRAINAGE CONTROL Storm water runoff from all areas except the wood storage and yard waste composting area will drain to an on-site retention pond. Runoff will be collected via surface swales and ditches and an underground storm drainage system. The storm drainage system will be designed for the 10 year storm per San Joaquin County Storm Drainage Design Standards. The retention pond will be sized to contain 200 percent of the computed volume of runoff from the 10 year/24-hour storm. The pond shall also be designed to empty by percolation and evaporation 100 hundred percent of the required volume of storage within 10 days. Storm water runoff from the wood storage and yard waste compost area will drain to an on-site lined evaporation pond. This pond will have a single clay liner with a permeability of 1 x IW cm per second or less and will be sized for the 100 year/24-hour storm. Water used for periodic wash down of the MRF/Transfer Station floor will be collected and directed to holding tanks for temporary storage. Holding tank(s) will be located outside the building in the paved area for easy access. Water will be pumped out as necessary and hauled to a local treatment facility or other approved facility for disposal. Testing will be done to insure compliance with any treatment standards prior to disposal. Water from the truck wash areas will be collected and discharged to a three stage sand and grease separator. Discharge from the separator will be directed to the on-site sewage disposal system that will consist of a septic tank and leach field designed and constructed in accordance with County of San Joaquin Public Health Services (Environmental Health Division) standards. 5. LITTER CONTROL All litter will be contained within the facility boundaries. Litter will be controlled by fences in strategic locations and around the entire perimeter of the site and by an aggressive program of litter pickup. Litter pick-up will be preformed by facility personnel. Vehicles will unload material inside the MRF/Transfer Building directly dumping onto the tipping floor minimizing the amount of litter generated. Additionally, transfer vehicles, roll-off boxes, etc. will be covered to prevent windblown litter while traveling on roadways. In addition, a tarping policy will be developed to inform all haulers and self-haul vehicles of the requirements to bring only covered loads to the facility. WPR0JECr/397/M"/RS1-1.TCY PXvision 1.0 42 FebngM 1,19%