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CHROMALAB, INC. Submission#: 2000-01-0266 <br /> Environmental Services(SDB) <br /> I <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#2000101123-01.05 <br /> LCS: 2000/01123-01.05-002 Extracted: 01/23/200017:22 Analyzed: 01/231200017:22 <br /> LCSD: 2000/01123-01.05-003 Extracted: 01/23/200017:55 Analyzed: 01123/200017:55 <br /> Compound Conc,` [ug/L] Exp.Cone. [ug/L] Recovery[% RPD Ctd. Limits r/a] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%I Recovery RPD LCS LCSD <br /> Gasoline 468 490 500 500 93.6 98.0 4.6 75-125 20 <br /> Benzene 88.5 88.9 100.0 100.0 88.5 88.9 0.5 77-123 20 <br /> Toluene 83.3 81.7 100.0 100.0 83.3 81.7 1.9 78-122 20 <br /> Ethyl benzene 83.7 82.0 100.0 100.0 83.7 82.0 2.1 70-130 20 <br /> i <br /> Xylene(s) 251 248 300 300 83.7 82.7 1.2 75-125 20 <br /> Surrogate(_) <br /> Trifluorotoluene 398 391 500 500 79.6 78.2 58-124 <br /> 1 4-Bromofluorobenzene-FI 426 446 500 500 85.2 89.2 50-150 <br /> I <br /> I <br /> I <br /> E <br /> 1220 Quarry Lane*Pleasanton,CA 94566-4756 <br /> Telephone:(925)484-1919*Facsimile:(925)4841096 <br /> jPrinted on:01/25/2000 17:39 Page 12 of 15 <br /> I <br />