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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-19425-1 <br /> Lab Control Sample - Batch: 720-49896 Method: 8260B <br /> Preparation: 5030B <br /> Lab Sample ID: LCS 720-49896/4 Analysis Batch: 720-49896 Instrument ID: Chemstation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05070913.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 10 mL <br /> Date Analyzed: 05/07/2009 1752 Final Weight/Volume: 10 mL <br /> Date Prepared: 05/07/2009 1752 <br /> Analyte Spike Amount Result % Rec. Limit Qual <br /> 1,1-Dichloroethene 10.0 9.42 94 70- 130 <br /> Trichloroethene 10.0 10.0 100 70- 130 <br /> Chlorobenzene 10.0 10.2 102 70- 130 <br /> Surrogate % Rec Acceptance Limits <br /> Toluene-d8(Surr) 99 82- 120 <br /> 4-Bromofluorobenzene 99 74- 131 <br /> 1,2-Dichloroethane-d4(Surr) 106 72- 125 <br /> Matrix Spike/ Method: 8260B <br /> Matrix Spike Duplicate Recovery Report- Batch: 720-49896 Preparation: 5030B <br /> MS Lab Sample ID: 720-19425-20 Analysis Batch: 720-49896 Instrument ID: Chemstation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05070921.D <br /> Dilution: 1.0 Initial Weight/Volume: 10 mL <br /> Date Analyzed: 05/07/2009 2215 Final Weight/Volume: 10 mL <br /> Date Prepared: 05/07/2009 2215 <br /> MSD Lab Sample ID: 720-19425-20 Analysis Batch: 720-49896 Instrument ID: Chemstation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05070922.D <br /> Dilution: 1.0 Initial Weight/Volume: 10 mL <br /> Date Analyzed: 05/07/2009 2246 Final Weight/Volume: 10 mL <br /> Date Prepared: 05/07/2009 2246 <br /> % Rec. <br /> Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qual <br /> 1,1-Dichloroethene 90 92 70- 130 1 20 <br /> Trichloroethene 96 96 70- 130 1 20 <br /> Chlorobenzene 101 102 70- 130 1 20 <br /> Surrogate MS% Rec MSD % Rec Acceptance Limits <br /> Toluene-d8(Surr) 97 97 82- 120 <br /> 4-Bromofluorobenzene 97 99 74- 131 <br /> 1,2-Dichloroethane-d4(Surr) 104 105 72- 125 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 50 of 53 <br />