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Table 2 Second Semester 2011 (3rd Quarter 2011) 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 8/9/2011 8/9/2011 8/10/2011 8/9/2011 8/10/2011 Limits Monitoring and Field Parameters Elevations feet TOC Elevation 258.43 299.62 320.75 341.57 256.52 NR Depth to Groundwater 208.68 255.81 273.12 285.71 217.16 NR Groundwater Elevation 49.75 43.81 47.63 55.86 39.36 NR General Water Quality Parameters Temperature -C field NS 22.5 21.4 21.6 21.4 NR H units field NS 7.51 7.69 7.63 7.54 5.8-8.6 Electrical Conductivity NS 194.9 274.1 261.6 251.9 460 uS/cm field Turbidity NTU field NS 11.7 16.3 41.6 13.8 47 Constituents of Concern Calcium NS 16 22 23 21 25 Magnesium NS 8.6 12 12 11 17 Sodium NS 12 17 15 15 17 Potassium NS 2.9 3.3 3.9 3.3 15 Bicarbonate Alkalinity as NS 95 130 130 120 130 HCO3 Carbonate Alkalinity as NS ND ND ND ND 0.81 CaCO3 Chloride NS f 5.2 8.7 6.5 8.2 9.6 Nitrate as Nitrogen NS 2.8 2.8 1.8 1.9 5.3 Sulfate NS 1.7 6.0 8.3 8.6 9.7 Total Dissolved Solids NS 180 220 220 210 260 Volatile Organic Com ounds 8260B u /L 1,1-Dichloroethene NS ND 0.49* ND ND detect Trichloroethene NS ND 1.4 ND ND detect All Other Compounds__ NS ND ND ND ND detect NS = Not Sampled, water level too low for sampling NE = Not Established ND = Not Detected NM = Not Measured NR= Not Required I = Insufficient data for statistical analysis *= concentration (estimated value) Bold values indicate VOC detections Underlined values indicate concentration limit exceedances LWA 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. MWA was not sampled this semester because the pump would not pump any water Foothill Sanitary Landfill 14 Department of Public Works/Solid Waste 2°d Semester and Annual 2011 Groundwater Monitoring County of San Joaquin-January 31,2012