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CHROMALAB, INC. Submission #: 2000-03-0252 <br /> Environmental Services(SDB) <br /> To: CH2M Hill-Oakland Test Method: 8015M <br /> 8020 <br /> Attn: Keith Sheets Prep Method: 5030 <br /> Batch QC Report <br /> Gas/BTEX <br /> I <br /> Laboratory Control Spike(LCS/LCSD) Water QC Batch#2000103115-01.01 <br /> LCS: 2000103115-01.01-002 Extracted: 03/15/2000 09:20 Analyzed 03/45/2000 09:20 { <br /> LCSD: 2000103115-01.01-003 Extracted: 03/15/2000 07:22 Analyzed 03/15/2000 07:22 <br /> Compound Conc. [ug1L] IExp.Conc. [uglL] Recovery[% RPD Ctrl.Limits[%] Flags <br /> LCS LCSD LCS LCSD LCS I LCSD [%] Recovery RPO LCS LCSD 1 <br /> Gasoline 517 503 500 500 103.4 100.6 2.7 75-125 20 <br /> Benzene 92.5 86.5 100.0 100.0 92.5 88.5 4.4 77-123 20 <br /> Toluene 92.0 86.6 100.0 100.0 92.0 86.6 6.0 78-122 20 <br /> Ethyl benzene 91.7 87.6 100.0 100.0 91.7 87.6 4.6 70-130 20 <br /> r <br /> Xylene(s) 273 262 300 300 91.0 87.3 4.2 75-125 20 <br /> Surrogate{s} <br /> Trifluorotoluens 450 411 500 500 90.0 82.2 58-124 <br /> 4Bromofluorobenzene-FI 479 480 500 500 95.6 96.0 50.150 <br /> I <br /> j <br /> f <br /> I <br /> I <br /> 1220 Quarry Lane`Pleasanton,CA 94566-4756 <br /> Telephone:(925)484-1919Facsimile:(925)4841096 I <br /> Printed on:03/16/2000 12.32 Page 6 of 6 i <br />