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Submission # 2401-07-a5az <br /> STL ChromaLab , <br /> Environmental Services(CA 1094) <br /> To Wright Environmental Services Inc Test Method 8021 B <br /> Attn Marla Reid Prep Method 5030 <br /> Batch QC Report <br /> Gas/BTEX by 8015M18021 <br /> Laboratory Control. Spike (LCS/LCSD) Water QC Batch #2001108/01-01 03 <br /> LCS 2001108/01-01 03-004 Extracted 08/01/2001 08 43 Analyzed 08/01/2001 08 43 <br /> LCSD 2001108101-0103-005 Extracted 08101120010914 Analyzed 08101120010914 <br /> Compound Conc [ug/L] Exp Conc [ug/L] lRecovery[%] RPD Ctrl Limits [%] I Flags <br /> LCS LCSD LCS LCSD LCS i LCSD [%] I Recovery RP�JL S LCSD <br /> i <br /> Benzene 102 101 1000 1000 1020 1010 10 77-123 20 <br /> Toluene 976 985 1000 1000 976 985 09 78-122 20 <br /> Ethyl benzene 987 101 1000 1000 987, 1010 2 3 70-130 20 <br /> Xylene(s) 292 k 298 300 300 97 3 993 2 0 75-125 20 <br /> 1 Surrogates) <br /> Tnfluorotoluene 473 476 500 500 946 952 58-124 <br /> 1220 Quarry lanePleasanton CA 94566-4756 <br /> Telephone (925)484-1919'Facsimile (925)484-1096 <br /> Printed on 08/06/2001 14 05 Page 12 of 14 <br />