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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-20072-1 <br /> Lab Control Sample/ Method: 8260B <br /> Lab Control Sample Duplicate Recovery Report- Batch: 720-50705 Preparation: 5030B <br /> LCS Lab Sample ID:LCS 720-50705/3 Analysis Batch: 720-50705 Instrument ID: Varian 390OF <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: e:\200905\052009\LS-WA <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 40 mL <br /> Date Analyzed: 05/20/2009 1431 Final Weight/Volume: 40 mL <br /> Date Prepared: 05/20/2009 1431 <br /> LCSD Lab Sample ID:LCSD 720-50705/2 Analysis Batch: 720-50705 Instrument ID: Varian 390OF <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: e:\200905\052009\LD-WA <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 40 mL <br /> Date Analyzed: 05/20/2009 1503 Final Weight/Volume: 40 mL <br /> Date Prepared: 05/20/2009 1503 <br /> % Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> 1,1-Dichloroethene 111 116 70- 130 4 20 <br /> Trichloroethene 105 109 70- 130 4 20 <br /> Chlorobenzene 108 104 70- 130 4 20 <br /> Surrogate LCS% Rec LCSD % Rec Acceptance Limits <br /> Toluene-d8(Surr) 100 100 70- 130 <br /> 4-Bromofluorobenzene 101 96 67- 130 <br /> 1,2-Dichloroethane-d4 (Surr) 99 102 67- 130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 10 of 13 <br />