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4 <br /> Quality Control Results <br /> Client: TRC Solutions Job Number: 720-520-1 <br /> Method Blank - Batch: 720-2246 Method: 8260B <br /> Preparation: 50308 <br /> Lab Sample ID:MB 720-2246110 Analysis Batch: 720-2246 Instrument ID:Varian 3900A. <br /> Client Matrix: Water Prep Batch: NIA Lab File ID: c:lsatumwsldata120051111' <br /> Dilution: 1.0 Units: ug/L Initial WeightfVolume:10 mL <br /> Date Analyzed: 11/22/2005 0730 Final Weight/Volume: 10 mL <br /> Date Prepared: 11/22/2005 0730 <br /> Analyte Result Qual RL <br /> 1,2-Dich loroethane N D 0.50 <br /> Benzene ND 0.50 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0.50 <br /> MTBE ND 0.50 <br /> TAME ND 0.50 <br /> Toluene ND 0.50 <br /> Xylenes,Total ND 1.0 <br /> TBA ND 5.0 <br /> DIPE ND 1.0 <br /> EDB ND 0.50 <br /> Gasoline Range Organics (GRO)-C6-C12 ND 50 <br /> Ethyl tert-butyl ether ND 0.50 <br /> Surrogate % Rec Acceptance Limits <br /> Toluene-d8 105 77 - 121 <br /> 1,2-Dichloroethane-d4 105 73 - 130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 12 of 19 <br />