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Quality Control Results <br /> Client: ATC Associates, Inc. Job Number: 720-737-1 <br /> Matrix Spike/ Method: 82608 <br /> Matrix Spike Duplicate Recovery Report-Batch: 720-2562 Preparation: 5030B <br /> MS Lab Sample ID: 720-714-A-1 MS Analysis Batch: 720-2562 Instrument iD: Varian 3900A <br /> Client Matrix: Water Prep Batch: NIA Lab File ID: c:lsaturnwsldata12005121' <br /> Dilution: 1.0 Initial WeightlVolume! 10 mL <br /> Date Analyzed: 12/03/2005 1338 Final Weight/Volume: 10 mL <br /> Date Prepared: 12/03/2005 1338 <br /> MSD Lab Sample ID: 720-714-A-1 MSD Analysis Batch: 720-2562 Instrument ID: Varian 3900A <br /> Client Matrix: Water Prep Batch: NIA Lab File ID: c:lsatumwsldata120051211, <br /> Dilution: 1.0 Initial Weight/Volume: 10 mL <br /> Date Analyzed: 12/0312005 1400 Final Weight/Volume: 10 mL <br /> Date Prepared: 12/03/2005 1400 <br /> % Rec. <br /> Analyte MS MSD Limit_ RPD RPD Limit MS Qual MSD Qual <br /> Benzene 82 87_. ._..._... 69- 129 6 20 <br /> MTBE 85 94 65- 165 10 20 <br /> Toluene 84 87 70- 130 4 20 <br /> Surrogate <br /> __� �MS %Rec MSD%Rec Acceptance Limits <br /> Toluene-d8 106 103 77-121 <br /> 1,2-Dichloroethane-d4 82 81 73-130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STiL San Francisco Page 12 of 13 <br />