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Table 2 First Semester 2013 (1St Quarter 2013) 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 2/4/13 2/4/13 2/4/13 2/4/13 2/4/13 Limits Monitoring and Field Parameters Elevations feet TOC Elevation 258.43 299.62 320.75 341.57 256.52 NR Depth to Groundwater 208.62 256.55 273.87 286.51 217.91 NR Groundwater Elevation 49.81 43.07 46.88 55.06 38.61 NR General Water Quali Parameters Temperature -C field NS 20.1 20.3 16.9 17.8 NR H units field NS 7.65 7.76 7.76 7.63 5.8-8.5 Electrical Conductivity NS 196.5 278.7 260.1 259.3 710 uS/cm field Turbidity NTU field NS 9.64 16.9 1 21.4 1 29.3 1 52 Constituents of Concern Calcium NS 15 22 22 21 25 Magnesium NS 7.9 12 11 11 12 Sodium NS 13 17 15 15 17 Potassium NS 3.1 3.5 4.0 3.5 12 Bicarbonate Alkalinity as NS 97 140 130 120 130 HCO3 Carbonate Alkalinity as NS ND ND ND ND 8 CaCO3 Chloride NS 5.0 8.0 6.0 7.9 13 Nitrate as Nitrogen NS 2.7 2.5 1.7 1.7 12 Sulfate NS 1 1.5 5.7 7.9 1 8.1 15 Total Dissolved Solids NS 1 160 220 210 210 360 Volatile Organic Com ounds 82606 u /L Trichloroethene NSND 0.92 ND ND detect All Other Compounds NS I 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 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. MW-1 was not sampled this semester because the pump would not pump any water Foothill Sanitary Landfill 13 Department of Public Works/Solid Waste 1 n Semester 2013 Groundwater Monitoring County of San Joaquin-July 25,2013