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' Quality Control Results <br /> ' Client: Earth Tech, Inc. Job Number: 720-14844-1 <br /> ' Matrix Spike/ Method: 8260B <br /> Matrix Spike Duplicate Recovery Report-Batch: 720-37121 Preparation: 5030B <br /> ' MS Lab Sample ID: 720-14850-A-1-G MS Analysis Batch: 720-37118 Instrument ID: Agilent 75MSD <br /> Client Matrix: Solid Prep Batch: 720-37121 Lab File ID: 062008007.D <br /> Dilution: 1.0 Initial Weight/Volume: 5.03 g <br /> Date Analyzed: 06/20/2008 1739 Final Weight/Volume: 10 mL <br /> Date Prepared: 06/20/2008 1200 <br /> MSD Lab Sample ID: 720-14850-A-1-H MSD Analysis Batch: 720-37118 Instrument ID: Agilent 75MSD <br /> Client Matrix: Solid Prep Batch: 720-37121 Lab File ID: 062008008.D <br /> Dilution: 1.0 Initial Weight/Volume: 5.03 g <br /> Date Analyzed: 06/20/2008 1805 Final Weight/Volume: 10 mL <br /> ' Date Prepared: 06/20/2008 1200 <br /> % Rec. <br /> Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qua] <br /> Benzene 99 100 73-116 2 20 <br /> ' Chlorobenzene 96 97 70-118 1 20 <br /> 1,1-Dichloroethene 104 104 68-138 0 20 <br /> Toluene 96 98 68-117 3 20 <br /> ' Trichloroethene 97 99 60- 126 3 20 <br /> Surrogate MS%Rec MSD%Rec Acceptance Limits <br /> 4-Bromofluorobenzene 99 _ 98 65- 130 <br /> ' 1,2-Dichloroethane-d4(Surr) 98 98 80-120 <br /> Toluene-d8(Surr) 95 94 66- 123 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> ' TestAmerica San Francisco Page 17 of 30 <br />