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Table 2 Groundwater Sampling Anayltical Results for the Tracy Tire Fire Site, San Joaquin County, California Sample Sample Method Analyte Resul I Qualifier MDL I PQMCL Units I.D. Date eneral Minerals and Metals Monitoring Parameters in Groundwater PW-1 04/22/03 6020 Lead 0.00032 B 0.000066 0.0010 0.015 mg/L 04/22/03 6020 Magnesium 28.8 G 0.0079 0.50 mg/L 04/22/03 6020 Manganese 0.0099 0.000087 0.0010 0.05* mg/L 04/22/03 7470A Mercury <0.0002 0.000064 0.0002 0.002 mg/L 04/22/03 6020 Molybdenum 0.0027 0.00060 0.0010 mg/L 04/22/03 6020 Nickel 0.0013 B 0.000098 0.0020 0.1 mg/L J 04/22/03 300.OA Nitrate as N 5.2 Q 0.30 0.50 45 mg/L 04/22/03 150.1 pH 7.7 0.10 0.10 pH 04/22/03 6020 Potassium 4.2 G 0.040 0.50 mg/L 04/22/03 6020 Selenium 0.0031 0.0017 0.0020 0.05 mg/L 04/22/03 6020 Silver <0.0010 0.000030 0.0010 0.1* mg/L 04/22/03 6020 Sodium 89.3 7 RLA 0.11 0.50 mg/L 04/22/03 120.1 Specific Conductance 1110 2.0 2.0 0.9* umhos/cm I_I 04/22/03 300.OA Sulfate 142 Q 1.4 10.0 250* mg/L 04/22/03 6020 Thallium <0.0010 0.00034 0.0010 0.002 mg/L 04/22/03 310.1 Total Alkalinity 139 5.0 5.0 mg/L 04/22/03 160.1 Total Dissolved Solids 717 5.4 10.0 500* mg/L { 04/22/03 376.2 Total Sulfide <0.050 0.0093 0.050 mg/L 04/22/03 180.1 Turbidity 50.3 Q 1.7 10.0 0.005* NTU 04/22/03 6020 Vanadium <0.10 G 0.031 0.10 mg/L G4/22/03 6020 Zinc 0.020 0.0010 0.0050 5 mg/L PW-2 04/22/03 6020 Aluminum <0.50 G 0.021 0.50 mg/L 04/22/03 6020 Arsenic <0.0020 0.00050 0.0020 mg/L {{{ 04/22/03 6020 Barium 0.068 0.00096 0.0010 mg/L 04/22/03 6020 Beryllium <0.0010 0.000078 0.0010 mg/L 04/22/03 6020 Cadmium <0.0010 0.000074 0.0010 mg/L t.1 04/22/03 6020 Calcium 78.3 RLA 0.15 0.50 mg/L 04/22/03 300.OA Chloride 157 Q 0.63 10.0 250* mg/L 04/22/03 6020 Chromium 0.0024 0.00092 0.0020 0.05 mg/L 04/22/03 6020 Cobalt 0.0019 0.000057 0.0010 mg/L 04/22/03 6020 Copper 0.0023 J 0.000056 0.0020 1.3/1.0* mg/L j(. Page 9 of 49 7/17/03