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Table 2 First Semester 2014 (1St Quarter 1 ) Groundwater Monitoring Results Foothill Sanitary Landfill (Units mg/I unless noted) Sampling Designation MW-1AMW-2R MW-3 MW-4 MW-5 Conc. Sampling Date 1/20/14 1/20/14 1/20/14 1/20/14 1/20/14 Limits Monitoring and Field Parameters Elevations feet TOC Elevation 244.21 299.62 320.75 341.57 256.52 NR Depth to Groundwater 198.64 258.34 276.06 288.54 219.84 NR Groundwater Elevation 45.57 41.28 44.69 53.03 36.68 NR General Water Qualitv Parameters Temperature -C field 20.20 20.80 19.50 19.90 20.6 NR pH (units)(field) 7.68 7.78 7.76 7.49 7.76 5.8-8.3 Electrical Conductivity 278.1 177.6 264.3 298.7 258.0 370 (uS/cm)(field) Turbidity(NTU)(field) 8.68 7.09 10.7 11.4 12.3 71 Constituents of Concern Calcium 22 15 22 22 21 23 Magnesium 11 8.1 12 11 11 12 Sodium 18 13 17 15 15 17 Potassium 3.4 3.2 3.6 4.1 3.6 4.4 Bicarbonate Alkalinity as 130 96 140 130 120 150 HCO3 Carbonate Alkalinity as ND ND ND ND ND 2.5 CaCO3 Total Alkalinity as 100 79 110 110 100 130 CaCO3 Chloride 11 5.3 8_6 6.6 8_8 7.5 Nitrate as Nitrogen 1.6 3.0 2.7 1.9 1.9 12 Sulfate 13 1.7 6.2 8.4 8.8 10 Total Dissolved Solids 230 160 190 190 180 1 260 Volatile Or anic Compounds 82608 u /L Acetone 9.3*) ND ND ND 5.2*} detect 1,1-Dichloroethene ND ND 0.58 ND ND detect Trichlorothene ND ND 1.4 ND ND detect All Compounds ND ND ND ND ND detect NS = Not Sampled, water level too low for sampling NE = Not Established NM = Not Measured ND = Not Detected NR= Not Required = 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. Foothill Sanitary Landfill 12 Department of Public Works/Solid Waste 15`Semester 2014 Groundwater Monitoring County of San Joaquin-July 31,2014 I