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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: 720-50709 Preparation: 5030B <br /> LCS Lab Sample ID:LCS 720-50709/2 Analysis Batch: 720-50709 Instrument ID: Varian 390OG <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: e:\data\200905\052009\LS. <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 40 mL <br /> Date Analyzed: 05/20/2009 1533 Final Weight/Volume: 40 mL <br /> Date Prepared: 05/20/2009 1533 <br /> LCSD Lab Sample ID:LCSD 720-50709/1 Analysis Batch: 720-50709 Instrument ID: Varian 390OG <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: e:\data\200905\052009\LD4 <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 40 mL <br /> Date Analyzed: 05/20/2009 1607 Final Weight/Volume: 40 mL <br /> Date Prepared: 05/20/2009 1607 <br /> % Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> 1,1-Dichloroethene 107 107 70- 130 0 20 <br /> Trichloroethene 99 90 70- 130 9 20 <br /> Chlorobenzene 114 113 70- 130 1 20 <br /> Surrogate LCS% Rec LCSD % Rec Acceptance Limits <br /> Toluene-d8(Surr) 102 82 70- 130 <br /> 4-Bromofluorobenzene 107 93 67- 130 <br /> 1,2-Dichloroethane-d4 (Surr) 110 99 67- 130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 18 of 27 <br />