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I <br /> Quality Control Results <br /> U1, <br /> Client: San Joaquin Company Inc Job Number: 720-4608-1 <br /> U, Matrix Spike/ Method: 82608 <br /> Matrix Spike Duplicate Recovery Report.-Batch: 720-11172 Preparation: 50308 <br /> MS Lab Sample ID: 720.4608-1 Analysis Batch: 720-11172 Instrument ID: Varian 3900A <br /> Client Matrix: Water Prep Batch: NIA Lab File ID: c:lsaturnwsldata120060711 <br /> ? Dilution: 1.0 Initial WeightlVolume: 10 mL <br /> i Date Analyzed: 07/19/2006 2316 Final Weight/Volume: 10 mL <br /> Date Prepared: 07/19/2006 2316 <br /> MSD Lab Sample ID: 720-4608-1 Analysis Batch: 720-11172 Instrument ID: Varian 3900A <br /> Client Matrix:. Water Prep Batch: NIA Lab File ID: c:Isaturnwsldata120060710P <br /> ` Dilution: 1.0 Initial Weight/Volume: 10 mL <br /> Date Analyzed: 07/19/2006 2338 Final.Weight/Volume: 10 mL <br /> Date Prepared: 07/19/2006 2338 <br /> s <br /> % Rec. <br /> Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qual <br /> Benzene 96 94 69-129 2 - 20 <br /> MTBE 101 94 65- 165 8 20 <br /> 'Toluene 97 96 70- 130 1 20 <br /> Surrogate MS% Rec MSD % Rec Acceptance Limits <br /> Toluene-d8 92 92 77-121 <br /> 1,2-Dichloroethane-d4 88 87 73-130 <br /> I <br /> fi <br /> 7 <br /> f <br /> 4 3 <br /> { <br /> i <br /> I <br /> 4 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 41 of 54 <br /> i <br />