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CHROMALAB, INC. Submission#: 2000-01-0266 <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#2000101124-01.05 <br /> LCS: 2000101124-01.05-002 Extracted: -01/24/2000 12:52 Analyzed: 01/24/2000 12:52 <br /> LCSD: 2000101124-01.05-003 Extracted: 011241200013:26 Analyzed: 011241200013:26 <br /> Compound Conc. [ug/L] Exp.Conc. [ug/L] Recovery 10/01 RPD Ctrl. Limits[%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [°A] Recovery RPD LCS LCSD <br /> Gasoline 502 509 500 500 100.4 101.8 1.4 75-125 20. <br /> Benzene 97.8 101 100.0 100.0 97.8 101.0 3.2 77-123 20 <br /> Toluene 93.2 93.6 100.0 100.0 93.2 93.6 0.4 78-122 20 I <br /> Ethyl benzene 95.3 93.7 100.0 100.0 95.3 93.7 1.7 70-130 20 <br /> Xylene(s) 282 277 300 300 94.0 92.3 1.8 75-125 20 <br /> Surrogate(s) <br /> 4-Bromofluorobenzene 473 479 500 500 94.6 95.8 50-150 <br /> Trifluorotoluene 462 461 500 500 92.4 92.2 58-124 <br /> 4-Bromofluorobenzene-FI 421 424 500 500 84.2 84.8 50-150 <br /> i <br /> I <br /> i <br /> 1220 Quant'Lane`Pleasanton,CA 94566-4756 <br /> Telephone:(925)484-1919"Facsimile:(925)484-1096 <br /> Printed on:011251200017:39 Page 13 Of 15 <br />