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MONITORING RESULTS Groundwater Summary Groundwater was sampled on February 11, 2004. Statistical analysis by Sanitas® shows that all constituents were within established concentration limits (Table 1). Concentration limits for parameters in deep aquifer wells MW-6 and MW-7 could not be determined due to insufficient data. Six VOCs were reported in impacted well MW-5. A trace of one VOC was reported in well MW-6. Shallow Aquifer SB-1 (Up-gradient): Concentrations of all parameters were within established concentration limits. The concentration limit of Nitrate as Nitrogen could not be determined using the current data due to greater than 50 percent non-detects. As requested by the RWQCB, the latest calculated concentration limit for Nitrate as Nitrogen is shown(Table 1). No VOCs were reported this quarter at SB-1. MW-4 (Down-gradient): Concentrations of allarameters were within established concentration limits. Because significant p � trends for pH and Nitrate continued this quarter in well MW-4, concentration limits could not be determined using the current data. The latest calculated concentration limits for pH and Nitrate are presented(Table 1). Rank Sum analyses indicate significantly different median concentrations between the compliance data and the background data and for pH and Nitrate. No VOCs were reported this quarter, continuing a trend of no VOCs(except for"false positives") for six consecutive quarters. Reported compounds that are also found in laboratory quality control blanks are "false positives". MW-5 (Down-gradient): MW-5 is an impacted well; therefore trend analysis is performed on MW-5 data for all constituents. p Y At the request of RWQCB staff,the concentration limits of inorganic constituents are indicated with the groundwater monitoring results to allow comparison with current data. Since the increasing trends in Chloride, TDS, Sulfate, and Electrical Conductivity and the decreasing trend in pH prevent the calculation of limits using the current quarter's data,the latest calculated concentration limits are shown(Table 1). Corral Hollow Landfill Department of Public Works/Solid Waste tsT Quarter 2004 Groundwater Monitoring 4 County of San Joaquin-April 15,2004