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Quality Control Results <br /> Client: H2OGeoI Job Number: 720-9207-1 <br /> Lab Control Spike/ Method: 8260B <br /> Lab Control Spike Duplicate Recovery Report- Batch: 720-21997 Preparation: 5030B <br /> LCS Lab Sample ID: LCS 720-21997/2 Analysis Batch: 720-21997 Instrument ID: Saturn 2100 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: c:lsatumwsldata120070510! <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 10 mL <br /> Date Analyzed: 05/24/2007 0940 Final Weight/Volume: 10 mL <br /> Date Prepared: 05/24/2007 0940 <br /> LCSD Lab Sample ID:LCSD 720-21997/1 Analysis Batch: 720-21997 Instrument ID: Saturn 2100 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: c:lsatumws\data1200705105; <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 10 mL <br /> Date Analyzed: 05/24/2007 1007 Final WeighWolume: 10 mL <br /> Date Prepared: 05/24/2007 1007 <br /> % Rec <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> Benzene 106 102 69- 129 4 25 <br /> MTBE 111 108 65- 165 2 25 <br /> Toluene 107 107 70- 130 1 25 <br /> Surrogate LCS% Rec LCSD%Rec Acceptance Limits <br /> Toluene-d8(Surr) 96 94 77-121 <br /> 1,2-Dichloroethane-d4(Surr) 80 82 73-130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 16 of 20 <br />