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WASTE DISCHARGE REQUI EMENTSORDER NO. R5-2003-0020 -2- FOR COUNTY OF SAN JOAQUIN FOR CONSTRUCTION, OPERATION, CLOSURE AND EVALUATION MONITORING FOOTHILL SANITARY LANDFILL, MUNICIPAL SANITARY LANDFILL SAN JOAQUIN COUNTY SITE DESCRIPTION 6. The measured hydraulic conductivity of the native soils underlying the Unit ranges between 5 x 10-3 and 1.4 x 10-7 (undisturbed samples). 7. The Central Valley Coast Range Fault, approximately 62 km from the site, has a maximum probable earthquake (MPE) of 6.5 on the Richter Scale. The San Andreas Fault, approximately 135 km distant, has a WE of 8.0. Both events have maximum probable accelerations at the site of 0.05 g (see information in the Liner Report of Waste Discharge, Appendix F). A site-specific seismic hazard report was prepared for FSL in April 2002. 8. Land uses within 1,000 feet of the facility are agricultural. 9. The facility receives an average of about 18 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. 10. The 100 -year, 24-hour precipitation event is estimated to be 3.9 inches, based on data published by the Department of Water Resources. 11. The waste management unit is not within a 100 -year flood plain based on the Federal Emergency Management Agency's (FEMA) Flood Insurance Rate Map, Community - Panel Number 060299-0365A, Effective Date May 15, 1980. 12. The active life of the facility is estimated to allow disposal until Year 2050, based on current disposal rates and capacities. The total capacity of the landfill is approximately 102 million cubic yards. The estimated service life will change if disposal rates differ significantly than those predicted. 13. There are eight domestic or agricultural groundwater supply wells within one mile of the site. Three of these eight wells have information maintained by the California Department of Water Resources that indicates they are domestic wells (ID Nos. 02N09EO2H, 02N09E11A, and 02N09E11A1). There is one well within the permitted boundary of the site (LW -1). This well is used for agricultural or landfill operational water and for domestic use at the on-site caretaker house. This well shall be included in the monitoring and reporting program, but shall not be considered a Point of Compliance. 14. The Discharger discharges non -hazardous municipal solid wastes, which are defined in §20164 of Title 27. Nonhazardous solid wastes include municipal solid wastes, as referred to in the Code of Federal Regulations, Title 40, Part 258.2.