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Quality Control Results <br /> Client TRC Solutions Job Number 720-1604-1 <br /> Laboratory Control/ Method 8260B <br /> Laboratory Control Duplicate Recovery Report - Batch 720-5016 Preparation 5030B <br /> LCS Lab Sample IMCS 720-5016115 Analysis Batch 720-5016 Instrument ID Varian 3900A <br /> Client Matrix Water Prep Batch NIA Lab File ID c lsatumwsldata120060110 <br /> Dilution 1 0 Units ug/L Initial Weight/Volume 10 mL <br /> Date Analyzed 01/29/2006 1302 Final Weight/Volume 10 mL <br /> Date Prepared 01/29/2006 1302 <br /> LCSD Lab Sample ID-CSD 720-5016114 Analysis Batch 720-5016 Instrument ID Varian 3900A <br /> Client Matrix Water Prep Batch NIA Lab File ID clsatumwsldata1200601101', <br /> Dilution 1 0 Units uglL Initial Weight/Volume 10 mL <br /> Date Analyzed 01/29/2006 1324 Final WeightlVolume 10 mL <br /> Date Prepared 01/29/2006 1324 <br /> % Rec <br /> Analyte LCS LCSD Limit RPO RPD Limit LCS Qual LCSD Qud <br /> Benzene 88 85 69 - 129 3 25 <br /> MTBE 102 98 65 - 165 4 25 <br /> Toluene 109 106 70 - 130 2 25 <br /> Surrogate LCS % Rec LCSD % Rec Acceptance Limits <br /> Toluene-d8 93 92 77 - 121 <br /> 1,2-Dichloroethane-d4 84 84 73 - 130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results <br /> STL San Francisco Page 19 of 24 <br />