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Table 2 Foothill Sanitary Landfill First Semester 2009 Groundwater Monitoring Results (Units mg/I unless noted) Sampling Designation MW-1 MW-2R MW-3 MW-3- MW-4 MW-5 Conc. Resam led Sampling Date 1/15/09 1/1 5/bg 1/15/09 2/25/09 1/15/09 1/15/09 Limits Monitoring and Field Parameters Elevations TOC Elevation 258.43 299.62 320.75 320.75 341.57 256.52 NR Depth to Groundwater 208.72 255.74 272.84 271.94 284.98 217.14 NR Groundwater Elevation 49.71 43.88 47.91 48.81 56.59 39.38 NR General Water Qualitv Parameters Temperature -C field NM 20 19.3 20.5 19.6 18.5 NR Chloride NM 5.63) 9.73 NR {7.141 9.01 9.7 Nitrate as Nitrogen NM 2.56 2.92 NR 1.53 1.75 5.4 Sulfate NM 1.35 6.51 NR 9.53 10.93 9.7 H units field NM 7.89 7.68 7.28 7.85 7.87 5.8-8.6 Electrical Conductivity NM 194.6 270.4 273.2 265.6 259.6 470 uS/cm field Turbidity NTU field NM 29.7 7.64 NR 20.4 11.7 47 Calcium NM 15 21 NR 22 21 26 Potassium NM 3.3 3.3 NR 4.3 3.7 17 Magnesium NM 8.1 12 NR 11 11 16 Sodium NM 12 15 NR 14 13 16 Alkalinity as CaCO3 NM 82 110 NR 120 100 120 Carbonate Alkalinity as NM ND ND NR ND ND 8 CaCO3 Bicarbonate Alkalinity as NM 100 140 NR 140 130 130 HCO3 Hydroxide Alkalinity as NM ND ND NR ND ND [1) CaCO3 Total Dissolved Solids NM 160 220 NR 200 220 260 Volatile Organic Com ounds u /L 1,1-Dichloroethene NM ND 0.35* ND ND ND detect Trichloroethene (TCE) NM ND 0.89 ND ND ND detect All Compounds NM ND ND NR ND ND detect NE= Not Established (1) Parameter also detected in one or more quality control blanks. ND= Not Detected NM = Not Measured NR= Not Required *=Trace concentration (estimated value) Bold values indicate VOC detections Underlined values indicate concentration limit exceedences MW-1 not enough water to sample this semester LW-1 sampling/testing is not part of the monitoring program 1 Not established due to >50% non-detects Foothill Sanitary Landfill 15 Department of Public Works/Solid Waste 1't Semester 2009 Groundwater Monitoring County of San Joaquin-July 31,2009