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INTRODUCTION San Joaquin County is submitting this first quarter 2004 monitoring report for the Corral Hollow Sanitary Landfill (CHSL) in compliance with Waste Discharge Requirements (WDR) Order No. 5-01-176 issued by the California Regional Water Quality Control Board, Central Valley Region, on June 14, 2001. The CHSL is located in southern San Joaquin County at the intersection of Interstate 580 and Corral Hollow Road(Figure 1). The landfill closed in 1991. MONITORING PROGRAM Water quality was monitored consistent with WDR Order No. 5-01-176. Water purged from wells prior to sampling is disposed to the ground around the wells to evaporate. Groundwater The groundwater monitoring network consists of seven monitoring wells. Both the shallow and deep aquifer are monitored Shallow Aquifer Three wells(SB-1,MW-4 and MW-5)monitor the shallow,perched aquifer. Well SB_ 1 is an up- gradient well, and wells MW-4 and MW-5 are down-gradient wells. Piezometer PZ-1 is used to measure the shallow aquifer elevation. The flow in the shallow aquifer is historically bi-directional (Figure 2). Deep Auq fifer Two wells (MW-6, and MW-7)were installed in 2003, and are used to monitor the deep aquifer. Well MW-7 is up-gradient to well MW-6. Groundwater flows in a northeasterly direction. Monitoring wells MW-1 and MW-2 have been dry since 1990. These wells are retained,but are not monitored. Groundwater samples are analyzed for the following quarterly monitoring and field parameters as specified in WDR Order No. 5-01-176: • Groundwater Elevation 0 Total dissolved solids (TDS) • Temperature 0 Chloride • Electrical conductivity • Sulfate • pH Nitrate-nitrogen • Turbidity Volatile organic compounds Corral Hollow Landfill Department of Public Works/Solid Waste 1ST Quarter 2004 Groundwater Monitoring � County of San Joaquin-April 15,2004