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C H R4 MALAB, INC. Submission #: 1999-06.0441 <br /> Environmental Services(SD8) <br /> To Wright Environmental Services Inc Test Method 8020 <br /> 8015M <br /> Attn Marla Reid Prep Method 5030 <br /> Batch QC Report <br /> Gas/BTEX <br /> Laboratory Control Spike (LCSILCSD) Water QC Batch#1999107106-0105 <br /> LCS 1999107106-01 05-002 Extracted 07/06/1999 08 20 Analyzed 07106/1999 08 20 <br /> LCSD 1999107106-01 05-003 Extracted 07/06/1999 09 24 Analyzed 07/06/1999 09 24 <br /> Compound Conc [ug/L] Exp Conc [ug/L] Recovery JO/ol RPD Ctrl Limits[%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recovery RPD LCS LCSD <br /> Gasoline 433 453 500 500 866 906 45 75-125 20 <br /> Benzene 857 84 6 1000 1000 857 846 13 77-123 20 <br /> Toluene 891 879 1000 1000 891 87 9 14 78-122 20 <br /> Ethyl benzene 88.0 91 9 1000 1000 880 91 9 4 3 70-130 20 <br /> Xylene(s) 263 273 300 300 877 91 0 37 75-125 20 <br /> Surrogate(s) <br /> Tnfluorotoluene 490 472 500 500 980 944 58-124 <br /> 4-Bromofluorobenzene-FI 328 332 500 500 656 66 4 50-150 <br /> • <br /> 1220 Quant'Lane"Pleasanton,CA 94566-4756 <br /> Telephone (925)484-1919'Facsimile (925)484-1096 <br /> Printed on 07/16/1999 11 31 page 6 of 6 <br />