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Table 2 Groundwater Sampling Anayltical Results for the Tracy Tire Fire Site, San Joaquin County, California Sample Sample Method Analyte ResulQualifier MDL I PQ MCL Units I.D. Date Volatile Organic Monitoring Parameters in Groundwater MW-5 08/04/03 8260B Methylene chloride <1.0 0.35 1.0 ug/L 08/04/03 8260B m-Xylene&p-Xylene <1.0 0.18 1.0 1750 ug/L 08/04/03 8260B Naphthalene <1.0 0.15 1.0 ug/L 08/04/03 8260B n-Butylbenzene <1.0 0.12 1.0 ug/L 08/04/03 8260B n-Propylbenzene <1.0 0.15 1.0 ug/L 08/04/03 8260B o-Xylene <1.0 0.10 1.0 ug/L 08/04/03 8260B p-Isopropyltoluene <1.0 0.13 1.0 ug/L 08/04/03 8260B sec-Butylbenzene <1.0 0.12 1.0 ug/L 08/04/03 8260B Styrene <1.0 0.15 1.0 100 ug/L 08/04/03 8260B tert-Butylbenzene <1.0 0.14 1.0 ug/L 08/04/03 8260B Tetrachloroethene <1.0 0.38 1.0 ug/L 08/04/03 8260B Toluene <1.0 0.25 1.0 150 ug/L 08/04/03 8260B trans-1,2-Dichloroethene <1.0 0.11 1.0 ug/L 08/04/03 8260B trans-l,3-Dichloropropene <1.0 0.30 1.0 ug/L 08/04/03 8260B Trichloroethene <1.0 0.31 1.0 ug/L 08/04/03 8260B Trichlorofluoromethane (Freon <1.0 0.23 1.0 150 ug/L 08/04/03 8260B Vinyl chloride <1.0 0.12 1.0 0.5 ug/L Notes: B = Estimated result. Result is less than the reporting limit. G = Elevated reporting limit. The reporting limit is elevated due to matrix interference. J = Method blank contamination. The associated method blank contains the target analyte at a reportable level. Q = Elevated reporting limit. The reporting limit is elevated due to high analyte levels. RLA = The reporting limit for this analyte is elevated due to sample dilution. MCL = Drinking water standard maximum contaminant level from "Regional Quality Control Board Central Valley Region: A compilation Water Quality Goals", August 2000. Value posted is primary MCL unless otherwise noted. * = Secondary MCL. MDL = method detection limit PQL = practical quantitation limit, also known as the reporting limit. mg/L = Milligrams per liter ug/L = micrograms per liter imhos/cm = micro-mhos per centimeter NTU = Nephelometric Turbidity Units Page 78 of 78 10/17/03