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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 Unit, j I.D. Date f General Minerals and Metals Monitoring Parameters in Groundwater MW-4 05/20/03 Dup 6020 Thallium <0.0010 0.00034 0.0010 0.002 mg/L 05/20/03 310.1 Total Alkalinity 260 5.0 5.0 mg/L 05/20/03 Dup 310.1 Total Alkalinity 255 5.0 5.0 mg/L 05/20/03 160.1 Total Dissolved Solids 840 5.4 10.0 500* mg/L 05/20/03 Dup 160.1 Total Dissolved Solids 835 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 Dup 376.2 Total Sulfide <0.050 0.0093 0.050 mg/L 05/20/03 180.1 Turbidity 898 Q 17.0 100 0.005* NfU 05/20/03 Dup 180.1 Turbidity. 720 Q 17.0 100 0.005* NI'U 05/20/03 6020 Vanadium <0.010 0.0031 0.010 mg/L 05/20/03 Dup 6020 Vanadium <0.010 0.0031 0.010 mg/L 05/20/03 6020 Zinc 0.0055 0.0010 0.0050 5 mg/L 05/20/03 Dup 6020 Zinc 0.0037 B 0.0010 0.0050 5 mg/L MW-5 04/14/03 6020 Aluminum 0.094 0.0021 0.050 mg/L 04/14/03 6020 Arsenic <0.0020 0.00050 0.0020 mg/L 04/14/03 6020 Barium 0.041 0.00096 0.0010 mg/L 04/14/03 6020 Beryllium <0.010 G 0.00078 0.010 mg/L 04/14/03 6020 Cadmium <0.0010 0.000074 0.0010 mg/L 04/14/03 6020 Calcium 101 7 RLA 0.015 0.25 mg/L 04/14/03 300.OA Chloride 129 Q 1.3 20.0 250* mg/L 04/14/03 6020 Chromium 0.0012 B 0.00092 0.0020 0.05 mg/L 04/14/03 6020 Cobalt 0.00064 B 0.000057 0.0010 mg/L 04/14/03 6020 Copper 0.0018 B 0.000056 0.0020 1.3/1.0* mg/L 04/14/03 9012A Cyanide, Total <0.010 0.0020 0.010 0.2 mg/L 04/14/03 7196A Hexavalent Chromium <0.010 0.0021 0.010 mg/L 04/14/03 6020 Iron <0.050 0.017 0.050 0.3* mg/L 04/14/03 6020 Lead 0.0096 0.000066 0.0010 0.015 mg/L 04/14/03 6020 Magnesium 37.3 1 0.00079 0.050 mg/L 04/14/03 6020 Manganese 0.037 1 0.000087 0.0010 0.05* mg/L 04/14/03 7470A Mercury <0.0002 0.000064 0.0002 0.002 mg/l, 04/14/03 6020 Molybdenum 0.0043 0.00060 0.0010 mg/L Page 6 of 49 7/17/03