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i <br /> CHROMALAB, INC. Submission #: 199942-0355 <br /> Environmental Services(SDB) <br /> To: CH2M Hill-Oakland Test Method: 8015M <br /> 8020 <br /> Atfi: Keith Sheets Prep Method: 5030 ` <br /> Batch QC Report i <br /> Gas/BTEX <br /> Laboratory Control Spike(LCS/LCSD) Water QC Batch#1999/12129-01.02 <br /> LCS: 1999112/29-01.02-002 Extracted: 1 212911 999 05:57 Analyzed 12/29/1999 05:57 <br /> LCSD: 1999/12/29-01.02-003 Extracted: 12/29/1999 06:26 Analyzed 12/29/1999 06:26 <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 540 588 500 500 108.0 117.6 8.5 75-125 20 <br /> Benzene 87.6 87.2 100.0 100.0 87.6 67.2 0.5 77-123 20 i <br /> Toluene 84.1 86.8 100.0 100.0 84.1 86.8 3.2 78-122 20 <br /> Ethyl benzene 83.8 86.9 100.0 100.0 83.8 86.9 3.6 70-130 20 <br /> Xylene(s) 249 263 300 300 83.0 87.7 5.5 75-125 20 <br /> surrogates) <br /> Trilluorololuene 366 360 Soo 500 73.2 72.0 58-124 <br /> 4-BromaBuorobenzene-Fl 508 494 500 500 101.6 98.8 50-150 <br /> I <br /> 4 <br /> I <br /> 1 <br /> 1 <br /> I <br /> I <br /> 1220 Quant'Lane`Pleasanton,CA 94566-4756 <br /> Telephone:(925)484-1919`Facsimile:(925)4841096 <br /> f <br /> Printed on:06/01/2000 16:22 Page 18 of 20 <br /> i <br /> i <br />