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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-19425-1 <br /> Lab Control Sample - Batch: 720-49865 Method: 8260B <br /> Preparation: 5030B <br /> Lab Sample ID: LCS 720-49865/2 Analysis Batch: 720-49865 Instrument ID: Chemstation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05040922.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 10 mL <br /> Date Analyzed: 05/04/2009 2040 Final Weight/Volume: 10 mL <br /> Date Prepared: 05/04/2009 2040 <br /> Analyte Spike Amount Result % Rec. Limit Qual <br /> 1,1-Dichloroethene 10.0 9.10 91 70- 130 <br /> Trichloroethene 10.0 10.0 100 70- 130 <br /> Chlorobenzene 10.0 9.98 100 70- 130 <br /> Surrogate % Rec Acceptance Limits <br /> Toluene-d8(Surr) 102 82- 120 <br /> 4-Bromofluorobenzene 103 74- 131 <br /> 1,2-Dichloroethane-d4(Surr) 104 72- 125 <br /> Matrix Spike/ Method: 8260B <br /> Matrix Spike Duplicate Recovery Report- Batch: 720-49865 Preparation: 5030B <br /> MS Lab Sample ID: 720-19484-A-1 MS Analysis Batch: 720-49865 Instrument ID: Chemstation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05040931.D <br /> Dilution: 1.0 Initial Weight/Volume: 10 mL <br /> Date Analyzed: 05/05/2009 0121 Final Weight/Volume: 10 mL <br /> Date Prepared: 05/05/2009 0121 <br /> MSD Lab Sample ID: 720-19484-A-1 MSD Analysis Batch: 720-49865 Instrument ID: Chemstation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05040932.D <br /> Dilution: 1.0 Initial Weight/Volume: 10 mL <br /> Date Analyzed: 05/05/2009 0152 Final Weight/Volume: 10 mL <br /> Date Prepared: 05/05/2009 0152 <br /> % Rec. <br /> Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qual <br /> 1,1-Dichloroethene 93 91 70- 130 2 20 <br /> Trichloroethene -388 -640 70- 130 5 20 4 4 <br /> Chlorobenzene 104 105 70- 130 1 20 <br /> Surrogate MS% Rec MSD % Rec Acceptance Limits <br /> Toluene-d8(Surr) 101 100 82- 120 <br /> 4-Bromofluorobenzene 101 100 74- 131 <br /> 1,2-Dichloroethane-d4(Surr) 104 102 72- 125 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 46 of 53 <br />