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STL ChromaLab Submission #• 2007-040530 <br /> Environmentai Services(CA 1094) <br /> To Wright Environmental Services Inc Test Method 8020 <br />. Attn Maria Reid Prep Method 5030 <br /> Batch QC Report <br /> Gas/BTEX <br /> Matrix Spike ( MS 1 MSD ) Water QC Batch #2001104/26-0103 <br /> Sample ID MW-2 Lab Sample ID 2001-04-0530-002 <br /> MS 2001/04126-01 03-024 Extracted 04/26/2001 20 53 Analyzed 04/26/2001 20 53 Dilution 10 <br /> MSD 2001104126-01 03-025Extracted 04/26/2001 21 23 Analyzed 04/26/2001 21 23 Dilution 10 <br /> Compound Conc [ug/L] Exp Conc [u IL] IRecove [% RPD CtrE Limits[%] Flags <br /> MS MSD �5ampie MS MSD MS I MSD 1%] Recovery! RPD j MS MSD <br /> Benzene 677 625 1 77907 1000 1000 659 607 82 65-135 20 mso <br /> Toluene 68 0 622 125542 1000 1000 667 609 91 65-135 20 mso <br /> Ethyl benzene 114 111 59 9 1000 1000 541 511 57 65-135 20 mso mso <br /> Xylene(s) 216 198 �28 8 300 300 62 4 664 101 65-135 20 mso mso <br /> Surrogate(s) <br /> 4-Bromofluorobenzene 322 293 500 500 64 4 586 50-150 <br /> 1220 Quarry Lane*Pleasanton CA 94566-4756 <br /> Telephone (925)484-1919*Facsimile (925)484-1096 <br /> Printed on 05/02/2001 16 51 Page 18 of 19 <br />