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Table 2 Groundwater Sampling Anayltical Results Tracy Tire Fire Site , San Joaquin County, California Sample Sample Date Method Analyte Result Qualifier MDL PQL MCL Uni#s I.D. { ineral Minerals and Metals Monitoring Parameters in Groundwater MW-2 10/09/03 300.OA Chloride 149 q 0.63 10.0 250* mg/L 10/09/03 6020 Chromium 0.0029 0.00092 0.0020 0.05 mg/L 10/09/03 6020 Cobalt 0.00018 B 0.000057 0.0010 mg/L 10/09/03 6020 Copper 0.0015 B J 0.000056 0.0020 1.3/1.0* mg/L 10109/03 9012A Cyanide, Total <0.010 0.0020 0.010 0.2 mg/L 10/09/03 7196A Hexavalent Chromium <0.010 0.0021 0.010 mg/L 10/09/03 6020 Iron <0.050 0.017 0.050 0.3* mg/L 10/09/03 6020 Lead <0.0010 0.000066 0.0010 0.015 mg/L 10/09/03 6020 Magnesium 33.0 0.00079 0.050 mg/L 10/09/03 6020 Manganese 0.00044 B 0.000087 0.0010 0.05* mg/L. 10/09/03 7470A Mercury <0.0002 0.000064 0.0002 0.002 mg/L 10/09/03 6020 Nickel 0.0015 B 0.000098 0.0020 0.1 mg/L 10/09/03 300.OA Nitrate as N 4.6 q 0.30 0.50 45 mg/L 10/09/03 150.1 pH 7.6 0.10 0.10 pH 10/09/03 6020 Potassium 4.4 0.0040 0.050 mg/L - 10/09/03 6020 Selenium 0.0019 B 0.0017 0.0020 0.05 mg/L W✓ 10/09/03 6020 Silver <0.0010 0.000030 0.0010 0.1* mg/L 10/09/03 6020 Sodium 97.1 0.011 0.050 mg/L ti 10/09/03 120.1 Specific Conductance 1080 2.0 2.0 0.9* umhos/cn 10/09/03 300.0A Sulfate 147 q 1.4 10.0 250* mg/L 10/09/03 6020 Thallium <0.0010 0.00034 0.0010 0.002 mg/L 10/09/03 6020 Tin <0.010 0.0014 0.010 mg/L 10/09/03 160.1 Total Dissolved Solids 738 5.4 10.0 500* mg/L 10/09/03 9060 Total Organic Carbon 1.2 0.035 1.0 mg/L Page 110 of 150 1127104