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TABLE 1 <br /> SHALLOW AQUIFER MONITORING <br /> FIRST QUARTER 2004 GROUNDWATER MONITORING RESULTS <br /> CORRAL HOLLOW SANITARY LANDFILL <br /> (Units mg/I unless noted) <br /> Monitoring Point SB-1 MW-4 PZ-1 MW-5 <br /> Date Conc. Date Conc. Date Date Conc. <br /> 2/11/04 Limit 2/11/04 Limit 2/11/04 2/11/04 Limit Trend <br /> Monitoring and Field Parameters <br /> Elevations(feet) <br /> TOC Elevation 272.27 NR 243.37 NR 244.54 297.85 NR NR <br /> Depth to Groundwater 41.14 NR 13.26 NR 14.74 68.07 NR NR <br /> Groundwater Elevation 231.13 NR 230.11 NR 229.8 229.78 NR NR <br /> General Water Quality Parameters <br /> Temperature(°C) 23.7 NR 20.4 NR NR 18.6 NR NR <br /> Chloride 26 74 200 441 NR 110 283 2 increasing <br /> Nitrate as Nitrogen 0.063 6.9 13 23 2 NR 15 28 none <br /> Total Dissolved Solids 610 902 1,500 2044 NR 740 1,480.2 increasing <br /> Sulfate 47 191 550 1010 NR 15 134 4 increasing <br /> pH (units) 7.12 6.3-7.8 7.48 6.6-8.1 3 NR 7.41 6.6-8.3 2 decreasing <br /> Electrical Conductivity 1008 1514 2,216 3,417 NR 1,207 2,412 2 increasing <br /> (,umhos/cm @ 25°C) <br /> Turbidity(NTU) 12.4 284 29.7 243 NR 37.6 147 none <br /> Volatile Organic Compounds (ug// <br /> Dichlorodifluoromethane ND detect ND detect NR 11 NR decreasing <br /> Methylene Chloride ND detect ND detect NR 1.3 NR decreasing <br /> Tetrachloroethene ND detect ND detect NR 6.2 NR increasing <br /> Trichlorofluoromethane ND detect ND detect NR 4.5 NR increasing <br /> Trichloroethene ND detect ND detect NR 0.69 NR none <br /> Vinyl Chloride ND detect ND detect NR 0.63 NR increasing <br /> All Other Compounds ND detect ND detect NR ND NR --- <br /> NR= Not Required <br /> ND = Not Detected <br /> 1: Concentration limit from fourth quarter 1999 because > 50%non-detects <br /> 2: Concentration limit from fourth quarter 1998 because of statistically significant trend <br /> 3: Concentration limit from second quarter 2002 because of statistically significant trend <br /> 4: Concentration limit determined using data to third quarter 2002 because of statistically significant trend. <br /> *Trace Concentration (estimated value) <br /> Corral Hollow Landfill Department of Public Works/Solid Waste <br /> 1ST Quarter 2004 Groundwater Monitoring County of San Joaquin-April 15,2004 <br />