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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 I.D. (: neral Minerals and Metals Monitoring Parameters in Groundwater MW-5 10/09/03 6020 Iron <0.050 0.017 0.050 0.3* mg/L 10/09/03 6020 Lead <0.0010 0.000066 0.0010 0.015 mg/L 10/09/03 6020 Magnesium 39.4 0.00079 0A50 mg/L 10/09/03 6020 Manganese 0.0014 0.000087 0.0010 0.05* mg/L 10/09/03 7470A Mercury <0.0002 0.000064 0.0002 0.002 mg/L 10/09/03 6020 Nickel 0.0020 0.000098 0.0020 0.1 mg/L 10/09/03 300.OA Nitrate as N ._I 2.0 q 0.30 0.50 45 mg/L 10/09/03 150.1 pH 7.6 0.10 0.10 pH 10/09/03 6020 Potassium 6.1 4.0040 0.050 mg/L 10/09/03 6020 Selenium <0.0020 0.0017 0.0020 0.05 mg/L 1 10/09/03 6020 Silver <0.0010 0.000030 0.0010 0.1* mg/L I 10/09/03 6020 Sodium 104 0.011 0.050 mglt 10/09/03 120.1 Specific Conductance 1210 2.0 2.0 0.9* umhos/cn 10/09/03 300.OA Sulfate 187 q 1.4 10.0 250* 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 811 5.4 10.0 500* mg/L 10/09/03 9060 Total Organic Carbon 1.6 0.035 1.0 mg/L W 10/09/03 376.2 Total Sulfide <0.050 0.0093 0.050 mg/L 10/09/03 180.1 Turbidity 5300 q 170 1000 0.005* NTU 10/09/03 6020 Vanadium 0.0054 B 0.0031 0.010 mg/L 10/09103 6020 Zine 0.0048 B 0.0010 0.0050 5 mg/L I ...Wolatile Organic Monitoring Parameters in Groundwater MW-1 10/09/03 8270C 1,2,4-Trichlorobenzene <10 0.51 10 70 ug/L Page 115 of 150 1127/04