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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 Qualifier MDL I PQ MCL Units 1 I.D. I Date General Minerals and Metals Monitoring Parameters in Groundwater MW-4 08/04/03 6020 Nickel <0.010 0.00049 0.010 0.1 mg/L 08/04/03 300.OA Nitrate as N 1.2 0.030 0.050 45 mg/L 08/04/03 6020 Potassium 4.8 0.020 0.25 mg/L 08/04/03 6020 Selenium <0.010 0.0085 0.010 0.05 mg/L 08/04/03 6020 Silver <0.0050 0.00015 0.0050 0.1* mg/L 08/04/03 6020 Sodium 107 0.055 0.25 mg/L 08/04/03 300.OA Sulfate 219 Q 2.8 20.0 250* mg/L 08/04/03 6020 Thallium <0.0050 0.0017 0.0050 0.002 mg/L 08/04/03 160.1 Total Dissolved Solids 842 5.4 10.0 500* mg/L 08/04/03 376.2 Total Sulfide <0.050 0.0093 0.050 mg/L 08/04/03 6020 Vanadium <0.050 0.016 0.050 mg/L 08/04/03 6020 Zinc 0.0064 B 0.0050 0.025 5 mg/L MW-5 08/04/03 6020 Aluminum 0.022 B 0.010 0.25 mg/L 08/04/03 6020 Antimony <0.010 0.00018 0.010 mg/L 08/04/03 6020 Arsenic <0.010 0.0025 0.010 mg/L 08/04/03 6020 Barium 0.033 0.0048 0.0050 mg/L 08/04/03 6020 Beryllium <0.0050 0.00039 0.0050 mg/L 08/04/03 6020 Cadmium <0.0050 0.00037 0.0050 mg/L 08/04/03 6020 Calcium 98.4 0.075 0.25 mg/L 08/04/03 300.OA Chloride 143 Q 0.63 10.0 250* mg/L 08/04/03 6020 Chromium <0.010 0.0046 0.010 0.05 mg/L 08/04/03 6020 Cobalt <0.0050 0.00028 0.0050 mg/L 08/04/03 6020 Copper 0.0017 B J 0.00028 0.010 1.3/1.0* mg/L 08/04/03 9012A Cyanide, Total <0.010 0.0020 0.010 0.2 mg/L 08/04/03 7196A Hexavalent Chromium <0.010 0.0021 0.010 mg/L 08/04/03 6020 Iron <0.25 0.085 0.25 0.3* mg/L 08/04/03 6020 Lead <O.0050 0.00033 0.0050 0.015 mg/L 08/04/03 6020 Magnesium 35.5 0.0040 0.25 mg/L 08/04/03 6020 Manganese 0.0044 B 0.00044 0.0050 0.05* mg/L 08/04/03 7470A Mercury <0.0002 0.000064 0.0002 0.002 mg/L 08/04/03 6020 Nickel <0.010 0.00049 0.010 0.1 mg/L Page 54 of 78 10/17/03