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Table 3 First Semester 2010 (2nd Quarter 2010) Groundwater Monitoring Results Foothill Sanitary Landfill (Units mg/I unless noted) Sampling Designation MW-1 MW-2R MW-3 MW-4 MW-5 Conc. Sampling Date 5/26/10 5/26/10 5/26/10 5/26/10 5/26/10 Limits Monitoring and Field Parameters Elevations feet TOC Elevation 258.43 299.62 320.75 341.57 256.52 NR Depth to Groundwater 207.20 255.22 272.39 284.61 216.60 NR Groundwater Elevation 51.23 44.40 48.36 56.96 39.92 NR General Water Quality Parameters Temperature -C field 231.7 NM NM 19.7 NM NR H (units)(field 7.69 NM NM 7.24 NM 5.8-9 Electrical Conductivity 231.7 NM NM 266.2 NM 440 (uS/cm)(field Turbidity NTU field 10.3 NM NM 21.1 NM 88 Constituents of Concern Calcium NM NM NM 22 NM 24 Magnesium NM NM NM 11 NM 13 Sodium NM NM NM 14 NM 17 18 Potassium NM NM NM 4 NM 4.7 Bicarbonate Alkalinity as NM NM NM 130 NM 180 HCO3 Carbonate Alkalinity as NM NM NM ND NM 2.5 CaCO3 Chloride NM NM NM 6.1 NM 8.5 Nitrate as Nitrogen NM NM NM 1.7 NM 1.8 Sulfate NM NM NM 8.2 NM 12 Total Dissolved Solids NM NM NM 260 NM 260 Volatile Organic Compounds (8260B)(ug/L) Toluene 0.48* NM NM ND NM detect All Other Compounds NM NM NM ND NM detect NE=Not Established ND=Not Detected NM=Not Measured NR=Not Required I=Insufficient data for statistical analysis *=Trace concentration(estimated value) Bolded values indicate VOC detections,underline values indicate concentration limit exceedances MW-1 not enough water for sampling this semester LW-1 sampling/testing is not part of the monitoring program [1]Not established due to>50%non-detects {1) Parameter also detected in one or more quality control blanks. Foothill Sanitary Landfill 15 Department of Public Works/Solid Waste 151 Semester 2010 Groundwater Monitoring County of San Joaquin-July 21,2010