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Quality Control Results <br /> Client Philips Environmental Services Corp Job Number 720-445-1 <br /> Laboratory Control/ Method 8260B <br /> Laboratory Control Duplicate Recovery Report- Batch 720-1973 Preparation 50308 <br />' LCS Lab Sample ID LCS 720-197314 Analysis Batch 720-1973 Instrument ID Varian 3900A <br /> Client Matrix Water Prep Batch NIA Lab File ID c lsatumwsldata120051111 <br /> Dilution 1 0 Units ug/L Initial WeightfVolume 10 mL <br /> Date Analyzed 11/15/2005 1854 Final WeighttVolume 10 mL <br /> Date Prepared 11/15/2005 1854 <br /> LCSD Lab Sample ID LCSD 720-197313 Analysis Batch 720-1973 Instrument ID Varian 3900A <br /> Client Matrix Water Prep Batch NIA Lab File ID c Isaturnwsldata1200511\111 <br /> Dilution 1 0 Units ug/L Initial Weight/Volume 10 mL <br /> Date Analyzed 11/15/2005 1915 Final Weight/Volume 10 mL <br /> Date Prepared 11/15/2005 1915 <br /> � ° Rec <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> Benzene 85 84 69- 129 1 25 <br /> OMTBE 88 84 65- 165 5 25 <br /> Toluene 90 88 70- 130 3 25 <br /> Surrogate LCS%Rec LCSD %Rec Acceptance Limits <br /> Toluene-d8 107 108 77-121 <br /> 1,2-Dichloroethane-d4 102 101 73-130 <br /> 1 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results <br /> STL San Francisco Page 10 of 12 <br />