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WASTE DISCHARGE REQUIREMENTS -2- WASTE MANAGEMENT OF NORTH AMERICA INCORPORATED FOOTHILL SANITARY LANDFILL INCORPORATED FOOTHILL SANITARY LANDFILL FACILITY CLASS III LANDFILL SAN JOAQUIN COUNTY 5. The Discharger proposes to continue to discharge municipal waste, including residential refuse, commercial waste, construction and demolition waste, agricultural waste, and tires, for disposal in the Class III landfill units. These wastes are classified as 'nonhazardous solid waste' or ' inert waste' using the criteria set forth in the California Code of Regulations (CCR) , Title 23, Chapter 3, Subchapter 15 (hereafter Subchapter 15). The discharge rate is approximately 1,600 cubic yards per day. Geology and Ground dater 6. The soils immediately underlying the site consist of grey-tan to dark brown cemented sandy silt and clay with varied layers of gravel . These soils extend to depths of at least 100 feet below the ground surface. 7. There are several faults in the area, but the Bear Mountain Fault Zone, at a distance of about 12 miles from the site, would most likely be the source of the maximum probable earthquake of 5. 7 on the Richter Scale. This produces an estimated potential peak bedrock acceleration at the site of 0.15 g. 8. The Discharger has demonstrated that greater than 100 feet of the natural geologic materials between the base of the landfill and the ground water will prevent the impairment of beneficial uses of ground water from the discharge of ' nonhazardous solid wastes ' to the landfill unit during operation, closure, and the post-closure maintenance period. Therefore, the site may be reclassified as a Class III landfill in accordance with Subchapter 15. 9. The first water bearing formation is approximately 200 feet below the base of the WMU. 10. The beneficial uses of ground water are domestic, municipal , agricultural and industrial supply. Hydrology 11. The facility receives an average 17.5 inches of precipitation per year as determined from an isohyetal map of San Joaquin County developed for "Storm Drainage Study and Master Plan, San Joaquin County, January 1973". The mean evaporation for this facility is 78 inches per year, as determined by the California Department of Water Resources for the station at the Oakdale Woodward Dam. 12. The 100-year, 24-hour precipitation event for the facility is 3.9 inches. This is based on data published by the California Department of Water Resources.