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I Table 2 Groundwater Sampling Anayltical Results for the Tracy Tire Fire Site, San Joaquin County, California I ISample I Sample Method Analyte Resul Qualifier MDL PQL MCL Units I.D. Date 1yeneral Minerals and Metals Monitoring Parameters in Groundwater MW-4 05/20/03 Dup 9012A Cyanide, Total 0.0052 B J 0.0020 0.010 0.2 mg/L j05/20/03 7196A Hexavalent Chromium <0.010 0.0021 0.010 mg/L 05/20/03 Dup 7196A Hexavalent Chromium <0.010 0.0021 0.010 mg/L 05/20/03 6020 Iron 0.032 B 0.017 0.050 0.3* mg/L 05/20/03 Dup 6020 Iron 0.040 B 0.017 0.050 0.3* mg/L 05/20/03 6020 Lead 0.00008 B 0.000066 0.0010 0.015 mg/L f 05/20/03 Dup 6020 Lead <0.0010 0.000066 0.0010 0.015 mg/L -1 05/20/03 6020 Magnesium 32.7 0.00079 0.050 mg/L I 05/20/03 Dup 6020 Magnesium 34.9 0.00079 0.050 mg/L ! 05/20/03 6020 Manganese 0.0045 0.000067 0.0010 0.05* mg/L 05/20/03 Dup 6020 Manganese 0.0047 0.000087 0.0010 0.05* mg/L 05/20/03 7470A Mercury 0.00008 B 0.000064 0.0002 0.002 mg/L - 05/20/03 Dup 7470A Mercury 0.00007 B 0.000064 0.0002 0.002 mg/L _3 05/20/03 6020 Nickel 0.00063 B 0.000098 0.0020 0.1 mg/L 05/20/03 Dup 6020 Nickel 0.00095 B 0.000098 0.0020 0.1 mg/L 05/20/03 300.OA Nitrate as N 1.2 0.030 0.050 45 mg/L 05/20/03 Dup 300.OA Nitrate as N 1.2 0.030 0.050 45 mg/L 05/20/03 150.1 pH 7.3 0.10 0.10 pH 05/20/03 Dup 150.1 pH 7.4 0.10 0.10 pH 1 05/20/03 6020 Potassium 4.8 0.0040 0.050 mg/L 05/20/03 Dup 6020 Potassium 4.8 0.0040 0.050 mg/L 05/20/03 6020 Selenium <0.0020 0.0017 0.0020 0.05 mg/L 05/20/03 Dup 6020 Selenium <0.0020 0.0017 0.0020 0.05 mg/L 05/20/03 6020 Silver <0.0010 0.000030 0.0010 0.1* mg/L 05/20/03 Dup 6020 Silver <0.0010 0.000030 0.0010 0.1* mg/L 05/20/03 6020 Sodium 97.2 1 0.011 0.050 mg/L ,- 05/20/03 Dup 6020 Sodium 103 1 0.011 0.050 mg/L 05/20/03 120.1 Specific Conductance 1250 2.0 2.0 0.9* umhos/cm 05/20/03 Dup 120.1 Specific Conductance 1290 2.0 2.0 0.9* umhos/cm 05/20/03 300.OA Sulfate 204 Q 2.8 20.0 250* mg/L 05/20/03 Dup 300.OA Sulfate 202 Q 2.8 20.0 250* mg/L 05/20/03 6020 Thallium <0.0010 0.00034 0.0010 0.002 mg/L I: 1 Page 5 of 49 7/17/03