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Quality Control Results <br /> Client Severn Trent Laboratories, Inc .lab Number 720-1910-1 <br /> Matrix Spike/ Method, 80158 <br /> Matrix Spike Duplicate Recovery Report-Batch 720-5532 Preparation, 5030B <br /> MS Lab Sample ID 720-1982-B-1 MS Analysis patch 720-5532 Instrument ID PID/FID Gas/Btex <br /> Client Matrix Water Prep Batch N/A Lair File ID N/A <br /> Dilution 10 Initial Weight/Volume 10 mL <br /> Date Analyzed 02/13/2006 1709 Final Weight/Volume 10 mL <br /> Date Prepared 02/13!2006 1709 Injection Volume <br /> Column ID PRIMARY <br /> MSD Lab Sample ID 720-1952-8-1 MSD Analysis Batch 720-5632 Instrument 1D PID/FID Gas/Btex <br /> i Client Matrix Water Prep Batch N/A Lab File ID N/A <br /> Dilution 10 Initial Weight/Volume 10 mL <br /> Date Analyzed 02/13/2006 1745 Final Weight/Volume 10 ml- <br /> Date <br /> LDate Prepared 02/13/2006 1745 Injection Volume <br /> Column ID PRIMARY <br /> Rec <br /> Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qual <br /> Gasoiine Range Organics(GRO)-05-C12 108 90 65-135 17 20 <br /> Surrogates MS%Rea MSD%Rea Acceptance Limits _M- <br /> 4-Bromofluorobenzene 105 96 50-150 <br /> i <br /> M <br /> Calculations are performed before rounding to avoid round-off errors in calculated results <br /> STL San Francisco Page 17 of 19 <br /> G613060189 STL Sacramento(916)373-5600 40 of 42 <br />