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E 11 WASTE DISCHARGE REQUIREMENTS - 3 - CITY OF STOCKTON FRENCH CAMP LANDFILL LIMITED CLASS III LANDFILL SAN JOAQUIN COUNTY 14. The 100 -year, 24-hour precipitation event for the facility is 3.8 inches. 15. The facility is within a 100 -year floodplain. 16. Surface drainage is to Walker and French Camp Sloughs, which are tributary to the San Joaquin River. 17. The beneficial uses of these surface waters are municipal and domestic supply (MUN), agricultural supply (AGR), industrial process supply (PROC), ground water recharge (GWR), water - contact recreation (REC-1), nonwater-contact (REC-2), navigation (NAV), fresh water replenishment (FRSH), warm freshwater habitat (WARM). 18. The area fill method is used at the site for current operations. The remaining landfill capacity will be filled in similar manner but is proposed to be developed in four modules. In Module 1, filling will take place behind a screening berm, starting in the southernmost section of the module, and will advance in a northerly direction until the module is filled to final slope grade. Modules 2, 3 and 4 will be filled in 10 foot thick lifts to final slope grade. 19. The Discharger's current plans indicate that the existing limited Class III landfill will reach capacity, at the earliest, by the year 2010. The site has a projected additional capacity of 1.45 million cubic yards. 20. All runoff from the site will be collected in drainage ditches and transported to sedimentation basins on the south and west sides of the landfill where it will be detained before release into French Camp and Walker Sloughs. 21. The Discharger has not demonstrated that the natural geologic materials between the base of the landfill and ground water will prevent the impairment of beneficial uses of ground water from the discharge of 'nonhazardous solid wastes' to the landfill during operation, closure, and the post -closure maintenance period.