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Quality Control Results <br />' Client Philips Environmental Services Corp Job Number 720-450-1 <br /> Laboratory Control/ Method 8260B <br /> Laboratory Control Duplicate Recovery Report-Batch 720-2099 Preparation 50308 <br /> LCS Lab Sample ID LCS 720-209912 Analysis Batch 720-2099 Instrument ID Varian 3900A <br /> Client Matrix Water Prep Batch NIA Lab File ID c Isatumwsldata1200511\1 <br /> Dilution 10 Units uglL Initial WeightlVolume 10 mL <br /> Date Analyzed 11/19/2005 0825 Final WeightlVolume 10 mL <br /> t Date Prepared 11/19/2005 0825 <br /> f <br /> LCSD Lab Sample ID LCSD 720-209911 Analysis Batch 720-2099 Instrument ID Varian 3900A <br /> Client Matrix Water Prep Batch NIA Lab File ID c lsaturnwsldata1200511\1I I <br /> Dilution 10 Units ug1L Initial WeightlVolume 10 mL <br /> I Date Analyzed 11/19/2005 0846 Final Weight/Volume 10 mL <br /> Date Prepared 11/19/2005 0846 <br /> ° Rec <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qua1 <br /> Benzene 85 91 69- 129 7 25 <br /> MTBE 85 90 65- 165 6 25 <br /> Toluene 90 95 70- 130 6 25 <br /> Surrogate LCS% Rec LCSD%Rec Acceptance Limits <br /> Toluene-d8 107 112 77-121 <br /> 1,2-Dichloroethane-d4 100 101 73-130 <br /> 1, <br /> i <br /> t <br /> Calculations are performed before rounding to avoid round-off errors in calculated results <br />,� STL San Francisco Page 28 of 34 <br />