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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2002-0219 -3- FOR COUNTY OF SAN JOAQUIN FOR CONSTRUCTION AND OPERATION OF NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL FACILITY, SAN JOAQUIN COUNTY Central Valley Coast Range Fault, approximately 46 km from the site has a maximum probable earthquake(MPE) of 6.4 on the Richter Scale, and the San Andreas Fault, approximately 124 km distant with an MPE of 8.0;both events have maximum probable accelerations at the site of 0.06 g. 9. Land uses within 1,000 feet of the facility are primarily agricultural,residential, and livestock grazing. 10. The facility receives an average of 17.5 inches of precipitation per year as determined from an isohyetal map of San Joaquin County developed in"Storm Drainage Study and Master Plan, San Joaquin County, January 1973. The mean pan evaporation is 78 inches per year as determined by the California Department of Water Resources for the station at the Oakdale Woodward Dam. 11. The 100-year, 24-hour precipitation event is estimated to be 3.65 inches based in data published by the Department of Water Resources (for the Stockton Disposal Plant). 12. The waste management unit is not within a 100-year flood plain,based the Federal Emergency Management Agency's (FEMA)Flood Insurance Rate Map, Community— Panel Number. 060299-0330A,Effective May 15, 1980. However,the site is within Flood Zone C,which is an area subject to minimal flooding. The flooding threat will be mitigated by construction of flood control berms. Berm construction will be done as filling proceeds from module to module and will be documented to the Board as construction proceeds. 13. There are 37 active municipal, domestic,industrial, or agricultural groundwater supply wells within one mile of the site. No surface springs or other sources of groundwater supply have been observed. "Domestic"water for use at the site is provided from a well on site. Also on site is a residential building, occupied under lease from San Joaquin County. Domestic water for the residence is provided by a well near that residence. There are no residences within 1000 feet of the landfill. 14. The active life of the facility is estimated to be 32 years,based on current disposal rates and capacities. The total capacity of the landfill is 16.2 million cubic yards. The estimated service life will change if disposal rates differ significantly than those predicted. 15. The Discharger proposes to place and maintain soil as a partial cover, in addition to intermediate(interim) cover, on the side slopes and top of the inactive portions of the Unit during the estimated 32-year lifespan prior to final closure. Surfaces that have reached final elevations or which are not at final elevations but which will not receive refuse within two years shall be maintained with the following soil cover thickness: