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C H ROMALAB, INC. Submission # 2000-04-0434 <br /> Environmental Services(SDB) <br /> To Wright Environmental Services Inc Test Method 8020 <br /> $015M <br /> Attn Chris Palmer Prep Method 5030 <br /> Batch QC Report <br /> Gas/BTEX <br /> Laboratory Control Spike (LCS/LCSD) Water QC Batch #2000/05101-01 03 <br /> LCS 2000105/01-01 03-002 Extracted 05/01/2000 07 46 Analyzed 05/01/2000 07 46 <br /> LCSD 2000105101-01 03-003 Extracted 05101/2000 08 17 Analyzed 05/01/2000 08 17 <br /> Compound Conc [ug/L] Exp Conc [ug/L] Recovery[%]I RPD Ctrl Limits [%] I Flags <br /> LCS LCSD LCS LCSD I LCS LCSD j [%j Recovery RPD LCS LCSD <br /> Gasoline 552 1498 500 500 1104 996 103 75-125 20 <br /> Benzene 462 458 50 50 92 4 916 09 77-123 20 <br /> Toluene 464 464 50 50 928 928 0 0 78-122 20 <br /> Ethyl benzene 468 46 7 50 50 936 934 0 2 70-130 20 <br /> Xylene(s) 148 148 150 150 98 7 I 987€ 0 0 75-125 20 <br /> Surrogate(s) <br /> Trnfluorotoluene 255 252 250 250 102 0 1008 58-124 <br /> 4-Bromofluorobenzene-FI 525 456 500 500 1050 9123 I 50-150 <br /> 1 <br /> Mt 1220 Quarry LanePleasanton CA 94566-4756 <br /> Telephone (925)484-1919'Facsimile (925)484-1096 <br /> Printed on 05102/2000 11 25 Page 24 of 24 <br />