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Six VOCs were reported this quarter from MW-5, which continues the 3-year downward trend in the number of VOCs reported. We expect the trend in the number of VOCs ("false positives" ignored) to continue. Trend analysis for concentrations of VOCs indicates a decreasing trend for two and an increasing trend for three of the VOCs reported this quarter. The trend analysis method will continue to be used quarterly in evaluating concentrations of VOCs in MW-5. The LFG Collection System continues to effective) reduce the concentration of LFG(and Y Y associated VOCs) in the soil beneath the landfill. Deems Aquifer MW-6 (Down-gradient): Inorganic constituent concentrations are within expected ranges(Table 2), including pH (8.69), which was measured at 11.23 in August and 9.96 in October of 2003. The pH level is now similar to the levels reported in the other deep aquifer wells (MW-1, MW-2, and MW-3) at the landfill before these wells"went dry". The pH will be monitored closely. Concentration limits could not be established due to insufficient data. One VOC (Toluene)was reported this quarter. Since the concentration is a trace amount, the well was not re-sampled. MW-7 (Up-gradient): Concentrations of inorganic constituents are within expected ranges (Table 2). No VOCs were reported this quarter, same as the previous quarter. Surface Water First storm water samples were taken on February 17, 2004. During the first quarter monitoring event,which occurred on February 11, there was no flowing surface water to sample. Statistical analysis shows that all constituents were within concentration limits where these could be established. No VOCs were detected. The Nitrate concentration limit could not be determined because there were greater than 50 percent non-detects. The tolerance limits of Carbonate Alkalinity,Bicarbonate Alkalinity,Calcium, Potassium,Magnesium, and Sodium could not be established because of insufficient data. Corral Hollow Landfill Department of Public Works/Solid Waste isT Quarter 2004 Groundwater Monitoring 5 County of San Joaquin-April 15,2004