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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-20074-1 <br /> Lab Control Sample/ Method: 8260B <br /> Lab Control Sample Duplicate Recovery Report- Batch: 720-50759 Preparation: 5030B <br /> LCS Lab Sample ID:LCS 720-50759/3 Analysis Batch: 720-50759 Instrument ID: Saturn 2K3 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: d:\data\200905\052009\LS. <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 40 mL <br /> Date Analyzed: 05/20/2009 1741 Final Weight/Volume: 40 mL <br /> Date Prepared: 05/20/2009 1741 <br /> LCSD Lab Sample ID:LCSD 720-50759/2 Analysis Batch: 720-50759 Instrument ID: Saturn 2K3 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: d:\data\200905\052009\LD4 <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 40 mL <br /> Date Analyzed: 05/20/2009 1813 Final Weight/Volume: 40 mL <br /> Date Prepared: 05/20/2009 1813 <br /> % Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> 1,1-Dichloroethene 97 99 70- 130 2 20 <br /> Trichloroethene 110 115 70- 130 4 20 <br /> Chlorobenzene 110 112 70- 130 2 20 <br /> Surrogate LCS% Rec LCSD % Rec Acceptance Limits <br /> Toluene-d8(Surr) 103 108 70- 130 <br /> 4-Bromofluorobenzene 99 97 67- 130 <br /> 1,2-Dichloroethane-d4 (Surr) 119 119 67- 130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 21 of 27 <br />