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WASTE DISCHARGE REQUIREMENTS -2- <br /> SAN JOAQUIN COUNTY <br /> FOOTHILL SANITARY LANDFILL INCORPORATED <br /> FOOTHILL SANITARY LANDFILL FACILITY <br /> CLASS III LANDFILL <br /> SAN JOAQUIN COUNTY <br /> 6. The Discharger proposes to continue to discharge municipal waste, including <br /> residential refuse, commercial waste, construction and demolition waste, <br /> agricultural waste, and tires, for disposal in the Class III landfill units. <br /> These wastes are classified as 'nonhazardous solid waste' or ' inert waste' <br /> using the criteria set forth in the California Code of Regulations (CCR) <br /> Title 23, Division 3, Chapter 15 (hereafter Chapter 15). The discharge rate <br /> is approximately 700 tons per day. <br /> Geology and Ground Water <br /> 7. The soils immediately underlying the site consist of grey-tan to dark brown <br /> cemented sandy silt and clay with varied layers of gravel. These soils <br /> extend to depths of at least 100 feet below the ground surface. <br /> 8. There are several faults in the area, but the Bear Mountain Fault Zone, at <br /> a distance of about 12 miles from the site, would most likely be the source <br /> of the maximum probable earthquake of 5.7 on the Richter Scale. This <br /> produces an estimated potential peak bedrock acceleration at the site of <br /> 0.15 g. <br /> 9. The Discharger has demonstrated that greater than 100 feet of the natural <br /> geologic materials between the base of the landfill and the ground water <br /> will prevent the impairment of beneficial uses of ground water from the <br /> discharge of 'nonhazardous solid wastes' to the landfill unit during <br /> operation, closure, and the post-closure maintenance period. Therefore, the <br /> site may be reclassified as a Class III landfill in accordance with Chapter <br /> 15. <br /> 10. The first water bearing formation is approximately 200 feet below the base <br /> of the WMU. <br /> 11. The beneficial uses of ground water are domestic, municipal , agricultural <br /> and industrial supply. <br /> Hydrology <br /> 12. The facility receives an average 17.5 inches of precipitation per year as <br /> determined from an isohyetal map of San Joaquin County developed for "Storm <br /> Drainage Study and Master Plan, San Joaquin County, January 1973". The mean <br /> evaporation for this facility is 78 inches per year, as determined by the <br /> California Department of Water Resources for the station at the Oakdale <br /> Woodward Dam. <br /> 13. The 100-year, 24-hour precipitation event for the facility is 3.9 inches. <br /> This is based on data published by the California Department of Water <br /> Resources. <br />