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Quality Control Results <br /> Client. H2OGeol Job Number: 720-8838-1 <br /> Lab Control Spike - Batch: 720-20897 Method: 8260B <br /> Preparation: 5030B <br /> Lab Sample ID: LCS 720-20897/1 Analysis Batch: 720-20897 Instrument ID: Varian 390OG <br /> Client Matrix: Solid Prep Batch: N/A Lab File ID: c:\saturnws\data\200704\0' <br /> Dilution: 1.0 Units: ug/Kg Initial Weight/Volume: 5 g <br /> Date Analyzed: 04/26/2007 1015 Final Weight/Volume: 10 mL <br /> Date Prepared: 04/26/2007 1015 <br /> Analyte Spike Amount Result % Rec. Limit Qual <br /> Benzene 100 94.4 94 69- 129 <br /> Chlorobenzene 100 99.2 99 61 - 121 <br /> 1,1-Dichloroethene 100 91.1 91 65- 125 <br /> Toluene 100 96.3 96 70- 130 <br /> Trichloroethene 100 97.7 98 74- 134 <br /> Surrogate %Rec Acceptance Limits <br /> 4-Bromofluorobenzene 80 60- 140 <br /> 1,2-Dichloroethane-d4 (Surr) 98 60- 140 <br /> Toluene-d8(Surr) 93 70- 130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 52 of 84 <br />