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4 n r <br /> WASTE DISCHARGE REQUIREMENTS 3 <br /> FOR CITY OF STOCKTON <br /> FRENCH CAMP LANDFILL <br /> CLASS III LANDFILL <br /> SAN JOAQUIN COUNTY <br /> 14. The site receives an average of 14 inches of precipitation per year as reported by the <br /> National Weather Service. The mean evaporation for this facility is 101 inches per <br /> year as measured between 1953 and 1979 at the Tracy Pumping Plant. <br /> 15. The 100 year, 24-hour precipitation event for the site is 3.8 inches. <br /> 16. Surface drainage is to Walker Slough and to French Camp Slough, which are tributary <br /> to the San Joaquin River. <br /> 17. The beneficial uses of these surface waters are municipal and domestic supply, <br /> agricultural supply, industrial process supply, ground water recharge, recreation, <br /> navigation, and freshwater habitat. <br /> OPERATION OF FACILITIES <br /> 18. The area fill method is used at the site for current operations. The remaining landfill <br /> capacity will be filled in a similar manner but is proposed to be developed in four <br /> modules. In Module 1, filling will take place behind a screening berm, starting in the <br /> southernmost section of the module, and will advance in a northerly direction until the <br /> module is filled to final slope grade. Modules 2, 3, and 4 will be filled in 10-foot- <br /> thick lifts to final slope grade. <br /> 19. The Discharger's current plans indicate that the Limited Class III landfill will reach <br /> capacity, at the earliest, by the year 2010. The site has a projected additional capacity <br /> of 1.12 million cubic yards. <br /> 20. The Storm Water Pollution Prevention Plan (SWPPP) calls for a single sedimentation <br /> pond to be constructed adjacent to French Camp Slough, southeast of the landfill. <br /> Storm water runoff would collect in a perimeter ditch and flow to the sedimentation <br /> pond. The pond would discharge to French Camp Slough after it has reached <br /> capacity. <br /> 21. The natural geologic materials between the base of the landfill and ground water may <br /> not prevent the impairment of beneficial uses of ground water from the discharge of <br /> nonhazardous solid wastes to the landfill during operation, closure, and the post- <br /> closure maintenance period. <br />