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r Table 2 Groundwater Sampling Anayltical Results for the Tracy Tire Fire Site, San Joaquin County, California Sample I Sample Method Analyte Resul Qualifier MDL PQL MCL Units I-D. Date leneral Minerals and Metals Monitoring Parameters in Groundwater MW-5 04/14/03 6020 Nickel 0.012 0.000098 0.0020 0.1 mg/L 04/14/03 300.OA Nitrate as N 2.4 Q 0.06b 0.10 45 mg/l. 04/14/03 150.1 PH 7.3 0.10 0.10 PH 04/14/03 6020 Potassium 6.8 J 0.0040 0.050 mg/L 04/14/03 6020 Selenium 0.0023 0.0017 0.0020 0.05 mg/L 04/14/03 6020 Silver <0.0010 0.000030 0.0010 0.1* mg/L J 04/14/03 6020 Sodium 103 J RLA 0.011 0.25 mg/L 04/14/03 120.1 Specific Conductance 1210 2.0 2.0 0.9* umhos/cm 04/14/03 300.OA Sulfate 173 Q 2.8 20.0 250* mg/L 04/14/03 6020 Thallium <0.0010 0.00034 0.0010 0.002 mg/L I` 04/14/03 310.1 Total Alkalinity 207 5.0 5.0 mg/L ` 04/14/03 160.1 Total Dissolved Solids 788 5.4 10.0 500* mg/L 04/14/03 376.2 Total Sulfide <0.050 0.0093 0.050 mg/L 04/14/03 180.1 Turbidity 368 17.0 100 0.005* NTU 04/14/03 6020 Vanadium <0.010 0.0031 0.010 mg/L 04/14/03 6020 Zinc 0.015 J 0.0010 0.0050 5 mg/L 05/20/03 6020 Aluminum 0.026 B 0.0021 0.050 mg/L 05/20/03 6020 Antimony 0.00047 B 0.000036 0.0020 mg/L 05/20/03 6020 Arsenic <0.0020 0.00050 0.0020 mg/L - 05/20/03 6020 Barium 0.035 0.00096 0.0010 mg/L 05/20/03 6020 Beryllium <0.0010 0.000078 0.0010 mg/L 05/20/03 6020 Cadmium <0.0010 0.000074 0.0010 mg/L 05/20/03 6020 Calcium 100 0.015 0.050 mg/L SIS 05/20/03 300.OA Chloride 125 Q 1.3 20.0 250* mg/L { 05/20/03 6020 Chromium 0.0031 0.00092 0.0020 0.05 mg/L 05/20/03 6020 Cobalt 0.0021 0.000057 0.0010 mg/L 05/20/03 6020 Copper 0.0021 J 0.000056 0.0020 1.3/1.0* mg/L 05/20/03 9012A Cyanide, Total 0.0070 B J 0.0020 0.010 0.2 mg/L 05/20/03 7196A Hexavalent Chromium <0.010 0.0021 0.010 mg/L I 05/20/03 6020 Iron� 0.061 0.017 0.050 0.3 mg/L 05/20/03 6020 Lead <0.0010 0.000066 0.0010 0.015 mg/L 05/20/03 6020 Magnesium 33.8 0.00079 0.050 mg/L .._i f Page 7 of 49 7/17/03 17