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WASTE DISCHARGE REQ UIREMENTSORDER NO. -2- FORWARD INC. FOR CLOSURE OF FRENCH CANT MUNICIPAL SOLID WASTE LANDFILL SAN JOAQUIN COUNTY 6. In 1999 the facility was acquired by Forward Inc. from the City of Stockton as part of a deal involving multiple properties. The facility stopped accepting waste in the second quarter of 1999. In October 2001 Forward Inc. submitted an initial Closure Plan and in February 2004 submitted the final amendments to complete the plan. SITE DESCRIPTION 7. Soils immediately underlying the landfill are lenticular deposits of clay, silt and sand with minor gravel. Hydraulic conductivity of the native soils underlying the Unit has not been measured at this site. 8. The peak bedrock horizontal acceleration(corresponding to the maximum credible acceleration) for French Camp Landfill to be 0.20 g., according to the USGS seismic maps (Frankel et al. 1997). 9. Land uses within 1,000 feet of the facility are residential, recreation, and agricultural. 10. The facility receives an average of 14 inches of precipitation per year as reported by the National Weather Service. The mean pan evaporation is 101 inches per year as measured at the Tracy Pumping Plant. 11. The 100-year, 24-hour precipitation event is estimated to be 3.8 inches,based on Department of Water Resources' bulletin entitled Rainfall Depth-Duration-Frequency for California, revised November 1982, updated August 1986. 12. The waste management facility is within a 100-year flood plain, the landfill is located on a triangular piece of low lying ground at the intersection of French Camp Slough and Walker Slough. The Walker Slough levee and the French Camp Slough levee form the north and south landfill boundaries respectively. 13. Some waste is located outside the landfill footprint beyond the levees in French Camp and Walker Sloughs. Stream sediment samples in the affected areas indicate that this fugitive waste is not hazardous and has not released significant pollutants into the two sloughs. Test pits and field observations of the levee slopes indicate that the'waste is wide spread but thinly deposited and likely represents waste that tumbled down the levee slopes during operation of the landfill. Complete removal of this waste would involve extensive disturbance of existence dense riparian vegetation on the margins of the sloughs and lower levee slopes. To avoid damage to outer levee slopes and to riparian vegetation cover a program of selective removal of wastes outside the landfill footprint is proposed by the discharger.