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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 Units L-1-D. . -T General MineralI -s and Metals Monitoring Parameters in Groundwater MW-3 10/09/03 7470A Mercury <0.0002 0.000064 0.0002 0.002 mg/L 10/09/03 6020 Nickel 0.0030 0.000098 0.0020 0.1 mg/L 10/09/03 300.OA Nitrate as N 1.2 q 0.15 0.25 45 mg/L 10/09/03 150.1 pH 7.4 0.10 0.10 pH 10/09/03 6020 Potassium 5.3 0.0040 0.050 mg/L 10/09/03 6020 Selenium <0.0020 0.0017 0.0020 0.05 mg/L 10/09/03 6020 Silver <0.0010 0.000030 0.0010 0.1* mg/L 10/09/03 6020 Sodium 159 0.011 0.050 mg/L 10/09/03 120.1 Specific Conductance 1740 2.0 2.0 0.9* umhos/cn 10/09/03 300.OA Sulfate 279 q 2.8 20.0 250* 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 1180 5.4 10.0 500* mg/L 10/09/03 9060 Total Organic Carbon 2.3 0.035 1.0 mg/L 10/09/03 376.2 Total Sulfide <0.050 0.0093 0.050 mg/L 10/09/03 180.1 Turbidity 5250 q 170 1000 0.005'1 NTC! 10/09/03 6020 Vanadium 0.0042 B 0.0031 0.010 mg/L 10/09/03 6020 Zinc 0.0038 B 0.0010 0.0050 5 mg/L MW-4 10/09/03 6020 Aluminum 0.0064 B 0.0021 0.050 mg/L 10/09/03 6020 Antimony 0.00009 B 0.000036 0.0020 mg/L 10/09/03 6020 Arsenic 0.00092 B J 0.00050 0.0020 mg/L 10/09/03 6020 Barium 0.031 0.00096 0.0010 mg/L 10/09/03 6020 Beryllium <0,0010 0.000078 0.0010 mg/L Page 112 of 150 1127104