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4, <br /> C H RO MALAB, INC. Submission #: 2000.07-0428 <br /> Environmental Services(SOB) <br /> • To Wright Environmental Services Inc Test Method 8020 <br /> 8015M <br /> Attn Chns Palmer Prep Method 5030 <br /> Batch QC Report <br /> Gas/BTEX <br /> Laboratory Control Spike (LCSILCSD) Water QC Batch #2000107128-01 01 <br /> LCS 2000107128-01 01-002 Extracted 07/28/2000 07 01 Analyzed 07/28/2000 07 01 <br /> LCSD 2000107128-01 01-003 Extracted 07/28/2000 07 36 Analyzed 07/28/2000 07 36 <br /> Compound Conc [ug/L] ' Exp Conc [ug/L] Recovery[%] RPD Ctrl Limits[%] Flags <br /> LCS I LCSD LCS LCSD LCS LCSD [%) Recovery I RPO LCS LCSD <br /> Gasoline 496 467 500 500 992 934 60 75-125 20 <br /> Benzene 935 915 1000 1000 935 915 2 2 77-123 20 <br /> Toluene 977 967 1000 1000 977 96 7 10 78-122 20 <br /> Ethyl benzene 938 92 0 1000 1000 938 920 1 9 70-130 20 <br /> Xylene(s) 283 276 300 300 943 920 25 75-125 20 <br /> Surrogate(s) <br /> Tnfluorotoluene 479 464 500 500 958 928 58-124 <br /> 4-Sromofluorobenzene-FI 357 355 500 500 I 714 7'10 50-150 <br /> 1220 Quarry LanePleasanton,CA 94566-4756 <br /> Telephone (925)484-1919'Facsimile (925)484-1096 <br /> Printed on 08/03/2000 10 55 Page 11 of 13 <br />