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i Table 2 Second Semester 2010 (3`d Quarter 2010) Groundwater Monitoring Results Foothill Sanitary Landfill (Units mg/I unless noted) Sampling Designation MW-1 MW-2R MW-3 MW-3- MW-4 MW-5 Conc. Resam led Sampling Date 8/31/10 8/31/10 8/31/10 11/11/10 8/31/10 8/31/10 Limits Monitoring and Field Parameters Elevations feet TOC Elevation 258.43 299.62 320.75 320.75 341.57 256.52 NR Depth to Groundwater 207.62 255.42 272.72 272.74 285.12 216.80 NR Groundwater Elevation 50.81 44.2 48.03 48.01 56.45 39.72 NR General Water Qualitv Parameters Tem erature -C field 22.6 25.90 24.5 20.8 21.7 23.5 NR H units field 7.27 7.53 7.55 7.24 7.29 7.44 5.8-9 Electrical Conductivity 234.9 135.1 259.3 611.4 273.8 258.6 440 (uS/cm)(field Turbidity NTU field 37.7 7.9 11.6 16.7 31.7 27.6 88 Constituents of Concern Calcium 22 15 22 NS 22 21 24 AM Magnesium 11 8.1 12 NS 11 11 13 Sodium 15 12 16 NS 15 15 17 Potassium 3.5 3.1 3.6 NS 4.0 3.5 4.7 Bicarbonate Alkalinity as 120 96 130 NS 130 120 180 HCO3 Carbonate Alkalinity as ND ND ND NS ND ND 2.5 CaCO3 Chloride 7.6 4.8 8.2 NS 6.1 7.7 8.5 Nitrate as Nitrogen 2.0 2.9 2.9 NS 1.8 1.9 1.8 Sulfate 9.1 1.5 6.1 NS 8.7 9.1 12 Total Dissolved Solids 220 190 230 NS 220 220 260 Volatile Organic Com ounds 82608 u /L Trichloroethene ND ND 0.3* 0.56 ND ND detect All Other Compounds ND ND ND NS ND ND detect NE=Not Established ND=Not Detected NM=Not Measured NR=Not Required I=Insufficient data for statistical analysis *=Trace concentration(estimated value) Bold values indicate VOC detections Underlined 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 16 Department of Public Works/Solid Waste 2od Semester and Annual 2010 Groundwater Monitoring County of San Joaquin-January 31,2011