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CHROMALAB, INC. Submission #: 1999-12-0377 <br /> Environmental Services(SDB) <br /> To: CH2M Hill-Oakland Test Method: 8020 <br /> 8015M <br /> Attn: Keith Sheets Prep Method: 5030 <br /> }, Batch QC Report <br /> ` Gas/BTEX <br /> Laboratory Control Spike(LCSILCSD) Water QC Batch#1999112130-01.02 <br /> LCS: 1999112130-01.02-002 Extracted: 12130/199906:01 Analyzed: 12/30/1999 06:01 <br /> LCSD: 1999112130-01.02-003 Extracted: 12/30/1999 06:29 Analyzed: 12/30/1999 06:29 <br /> r <br /> Compound Conc. [ug/L] Exp.Conc. [ug/L] Recovery[% RPD Ctrl. Limits[%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recovery RPD LCS LCSD <br /> Gasoline 497 505 500 500 99.4 101.0 1.6 75-125 20 <br /> Benzene 91.9 88.3 100.0 100,0 91.9 88.3 4.0 77-123 20 <br /> 1 Toluene 88.7 88.3 100.0 100.0 88.7 88.3 0.5 78-122 20 <br /> Ethyl benzene 87.5 88.8 100.0 100.0 . 87.5 88.8 1.5 70-130 20 <br /> Xylene(s) 263 271 300 300 87.7 90.3 2.9 75-125 20 <br /> Surrogate(s) <br /> Trifluorotoluene 380 353 500 500 76.0 70.6 58-124 <br /> 4-Bromofluorobenzene-FI 478 496 500 500 95.6 99.2 50-150 <br /> r <br /> i <br /> 1 <br /> 1220 Quarry Lane•Pleasanton,CA 94566-4756 <br /> Telephone:(925)484-1919"Facsimile:(925)484-1096 <br /> Printed on:01/03/2000 15:10 Page 20 of 20 <br />