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Quality Control Results <br /> Client: San Joaquin Company Inc Job Number: 720-4608-1 <br /> Laboratory Control/ Method: 82608 <br /> Laboratory Control Duplicate Recovery Report -Batch: 720-11228 Preparation: 5030E <br /> LCS Lab Sample ID:LCS 720-1122819 Analysis Batch: 720-11228 Instrument ID: Varian 3900A <br /> Client Matrix: Water Prep Batch: NIA Lab Fife ID: c:Isaturnwsldata120060710; <br /> Dilution: 1.0 Units: ug/L: Initial Weight/Volume: 10 mL <br /> r Date Analyzed: 07/21/2006 0859 Final WeightNolume- 10 mL <br /> Date.Prepared: 07/21/2006 0859 <br /> LCSD Lab Sample ID:LCSD 720-1122818 Analysis Batch: 720-11228 Instrument ID: Varian 3900A <br /> Client Matrix: Water Prep Batch: NIA :Lab File ID: c:lsaturnwsldata1200607107,' <br /> Dilution: 1.0 Units:ug/L Initial Weight/Volume: 10 mL <br /> �. Date Analyzed: 07/21/2006 0921 Final Weight/Volume: 10 mL <br /> Date Prepared: 07/21/2006 0921 <br /> % Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qua] LCSD Qual <br /> Benzene 95 92 69- 129 3 25 <br /> MTBE 98 93 65-165 6 25 <br /> Toluene 99 97 70-130 2 25 <br /> Surrogate LCS% Rec LCSD% Rec Acceptance Limits <br /> Toluene-d8 95 92 77- 121 <br /> 1,2-Dichloroethane-d4 91 89 73-130 <br /> I <br /> 1 3 <br /> I <br /> y1y <br /> _ S <br /> 5 4 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> i STL San Francisco Page 45 of 54 <br />