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TABLE 1 <br /> Shallow Aquifer Groundwater Monitoring Results - Second Quarter 2007 <br /> Corral Hollow Sanitary Landfill <br /> (Units mg/I unless noted) <br /> Monitoring Point S13-1 MW-4 MW-5 <br /> Date Conc. Date Conc. Date Conc. <br /> 4/16/07 Limit 4/16/07 Limit 4/16/07 Limit Trend <br /> Monitoring and Field Parameters <br /> Elevations(feet) <br /> TOC Elevation 275.46 NR 246.67 NR 300.93 NR NR <br /> Depth to Groundwater 39.9 NR 16.08 NR 67.7 NR NR <br /> Groundwater Elevation 235.56 NR 230.59 NR 233.23 NR NR <br /> General Water Quality Parameters <br /> Temperature(°C) 18.2 NR 17.9 NR 18.2 NR NR <br /> Chloride 15 27 120 450 95 [1] increasing <br /> Nitrate as Nitrogen 0.05* [1] 9 31 13 28 decreasing <br /> Total Dissolved Solids 710 [1] 1,200 2,100 800 [1] increasing <br /> Sulfate 43 66 410 850 15 160 none <br /> pH(units) 7.32 6.2-7.8 7.38 6.3-8.0 7.22 6.2-7.9 none <br /> Electrical Conductivity 1,461 1,500 1,784 3,500 1,194 2000 none <br /> (pmhos/cm @ 25°C) <br /> Turbidity(NTU) 1 10.4 200 9.1 150 8.1 76 none <br /> Volatile Organic Compounds <br /> Lu /L <br /> Trichlorofluoromethane ND detect ND detect 4.6 detect increasing <br /> Trichloroethene ND detect ND detect 0.66 detect none <br /> Tetrachloroethene ND detect ND detect 4.7 detect increasing <br /> Dichlorodifluoromethane ND detect ND detect 8.9 detect none <br /> Methylene Chloride ND detect ND detect 0.68* detect decreasing <br /> Vinyl Chloride ND detect ND detect 0.6 detect none <br /> All Other Compounds ND detect ND detect ND detect --- <br /> NR=Not Required ND=Not Detected NE=Not established,due to>50%non-detects <br /> Underlined values indicate a concentration limit exceedance. Bolded values indicate a detected organic compound. <br /> * Trace Concentration(estimated value) <br /> [1]Not established due to statistically significant increasing trend. Concentration limit from WDRs. <br /> I= Insufficient data for statistical analysis <br /> { } Indicates compounds also found in laboratory control blanks <br /> Corral Hollow Landfill 12 Department of Public Works/Solid Waste <br /> 2n°Quarter 2007 Groundwater Monitoring County of San Joaquin—July 31,2007 <br />