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CHROMALAB, INC. Submission #: 1999-08-0176 <br /> Environmental Services(SDB) <br /> To Aqua Science Engineers, Inc Test Method 8015M <br /> 8020 <br /> Attn [an T Reed Prep Method 5030 <br /> Batch QC Report <br /> Volatile Hydrocarbons by 8015/8020 <br /> Laboratory Control Spike (LCS/LCSD) Water QC Batch # 1999108119-01 02 <br />' LCS 1999108119-01 02-002 Extracted 08/19/1999 06 57 Analyzed 08/19/1999 06 57 <br /> LCSD 1999108119-01 02-003 Extracted 08/19/1999 07 51 Analyzed 08/19/1999 07 51 <br />' Compound Conc [ug/L] Exp Conc [ug/L j Recovery[%] RPD Ctrl Limits[%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recovery RPD LCS LCSD <br /> Gasoline 495 449 500 500 99 0 89 8 9 7 75-125 20 <br /> Surrogate(s) <br /> 4-Bromofluorobenzene-FI 470 448 500 500 940 896 50-150 <br /> r <br /> 1220 Quarry LanePleasanton,CA 94566-4756 <br /> Telephone (925)484-1919'Facsimile (925)484-1096 <br /> Printed on 08/20/1999 18 12 Page 15 of 15 <br />