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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 PQL MCL Units I' I.D. Date General Minerals and Metals Monitoring Parameters in Groundwater MW-5 05/20/03 6020 Manganese 0.0074 0.000087 0.0010 0.05* mg/L 05/20/03 7470A Mercury 0.00011 B 0.000064 0.0002 0.002 mg/L 05/20/03 6020 Nickel 0.00074 B 0.000098 0.0020 0.1 mg/L 05/20/03 300.OA Nitrate as N 2.1 Q 0.15 0.25 45 mg/L 05/20/03 150.1 pH 7.4 0.10 0.10 pH 05/20/03 6020 Potassium 6.0 0.0040 0.050 mg/L 05/20/03 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 6020 Sodium 90.8 J 0.011 0.050 mg/L 05/20/03 120.1 Specific Conductance 1180 2.0 2.0 0.9* umhos/cm 05/20/03 300.OA Sulfate 171 Q 2.8 20.0 250* mg/L 05/20/03 6020 Thallium <0.0010 0.00034 0.0010 0.002 mg/L 05/20/03 310.1 Total Alkalinity 230 5.0 5.0 mg/L 05/20/03 160.1 Total Dissolved Solids 776 5.4 10.0 500* mg/L 05/20/03 376.2 Total Sulfide <0.050 0.0093 0.050 mg/L 05/20/03 180.1 Turbidity 2340 Q 170 1000 0.005* NTU 05/20/03 6020 Vanadium <0.010 0.0031 0.010 mg/L 05/20/03 6020 Zinc 0.0053 0.0010 0.0050 5 mg/L PW-1 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 0.051 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 04/22/03 6020 Calcium 83.8 RLA 0.15 0.50 mg/L 04/22/03 300.OA Chloride 164 Q 0.63 10.0 250* mg/L 04/22/03 6020 Chromium 0.0036 0.00092 0.0020 0.05 mg/L 04/22/03 6020 Cobalt 0.0011 0.000057 0.0010 mg/L 04/22/03 6020 Copper 0.0020 1 0.000056 0.0020 1.3/1.0* mg/L 04/22/03 9012A Cyanide, Total <0.010 0.0020 0.010 0.2 mg/L 04/22/03 7196A Hexavalent Chromium <0.010 0.0021 0.010 mg/L 04/22/03 6020 Iron 0.020 B 0.017 0.050 0.3* mg/L Page 8 of 49 7/17/03