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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-19425-1 <br /> Lab Control Sample - Batch: 720-49879 Method: 8260B <br /> Preparation: 5030B <br /> Lab Sample ID: LCS 720-49879/3 Analysis Batch: 720-49879 Instrument ID: Chemstation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05040905.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 10 mL <br /> Date Analyzed: 05/04/2009 1052 Final Weight/Volume: 10 mL <br /> Date Prepared: 05/04/2009 1052 <br /> Analyte Spike Amount Result % Rec. Limit Qual <br /> 1,1-Dichloroethene 10.0 9.86 99 70- 130 <br /> Trichloroethene 10.0 10.8 108 70- 130 <br /> Chlorobenzene 10.0 10.6 106 70- 130 <br /> Surrogate % Rec Acceptance Limits <br /> Toluene-d8(Surr) 107 82- 120 <br /> 4-Bromofluorobenzene 111 74- 131 <br /> 1,2-Dichloroethane-d4(Surr) 109 72- 125 <br /> Matrix Spike/ Method: 8260B <br /> Matrix Spike Duplicate Recovery Report- Batch: 720-49879 Preparation: 5030B <br /> MS Lab Sample ID: 720-19483-A-2 MS Analysis Batch: 720-49879 Instrument ID: Chemstation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05040906.D <br /> Dilution: 1.0 Initial Weight/Volume: 10 mL <br /> Date Analyzed: 05/04/2009 1123 Final Weight/Volume: 10 mL <br /> Date Prepared: 05/04/2009 1123 <br /> MSD Lab Sample ID: 720-19483-A-2 MSD Analysis Batch: 720-49879 Instrument ID: Chemstation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05040911.D <br /> Dilution: 1.0 Initial Weight/Volume: 10 mL <br /> Date Analyzed: 05/04/2009 1442 Final Weight/Volume: 10 mL <br /> Date Prepared: 05/04/2009 1442 <br /> % Rec. <br /> Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qual <br /> 1,1-Dichloroethene 96 94 70- 130 3 20 <br /> Trichloroethene 104 102 70- 130 2 20 <br /> Chlorobenzene 104 104 70- 130 0 20 <br /> Surrogate MS% Rec MSD % Rec Acceptance Limits <br /> Toluene-d8(Surr) 107 107 82- 120 <br /> 4-Bromofluorobenzene 111 110 74- 131 <br /> 1,2-Dichloroethane-d4(Surr) 109 114 72- 125 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 48 of 53 <br />