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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-19425-1 <br /> Lab Control Sample/ Method: 8260B <br /> Lab Control Sample Duplicate Recovery Report- Batch: 720-49569 Preparation: 5030B <br /> LCS Lab Sample ID:LCS 720-49569/3 Analysis Batch: 720-49569 Instrument ID: Varian 390OG <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: e:\data\200905\050309\Is-� <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 40 mL <br /> Date Analyzed: 05/03/2009 0946 Final Weight/Volume: 40 mL <br /> Date Prepared: 05/03/2009 0946 <br /> LCSD Lab Sample ID:LCSD 720-49569/2 Analysis Batch: 720-49569 Instrument ID: Varian 390OG <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: e:\data\200905\050309\LD4 <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 40 mL <br /> Date Analyzed: 05/03/2009 1019 Final Weight/Volume: 40 mL <br /> Date Prepared: 05/03/2009 1019 <br /> % Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> 1,1-Dichloroethene 93 96 70- 130 3 20 <br /> Trichloroethene 94 91 70- 130 3 20 <br /> Chlorobenzene 97 103 70- 130 5 20 <br /> Surrogate LCS% Rec LCSD % Rec Acceptance Limits <br /> Toluene-d8(Surr) 101 102 82- 120 <br /> 4-Bromofluorobenzene 98 92 74- 131 <br /> 1,2-Dichloroethane-d4 (Surr) 95 92 72- 125 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 37 of 53 <br />