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CHROMALAB, INC. Submission #: 1999-12-0377 <br /> Environmental Services(SDB) <br /> To: CH21V! Hill-Oakland Test Method: 8020 <br /> 8015M <br /> Attn: Keith Sheets Prep Method: 5030 <br /> r Batch QC Report <br /> I Gas/BTEX (Methanol Extraction) <br /> Laboratory Control Spike(LCS/LCSD) So[] QC Batch#1999112128-05.02 <br /> LCS: 1999112128-05.02-002 Extracted: 121281199915:22 Analyzed: 121281199915:22 <br /> LCSD: 1999112128-05.02-003 Extracted: 121291199915:31 Analyzed: 121291199915:31 <br /> Compound Conc. [mg/Kg j Exp.Conc. [mg/Kg] Recovery[°/U RPD Ctrl. Limits[%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [',6] Recovery RPD LCS LCSD <br /> Gasoline 0.657 0.677 0.625 0.625 105.1 108.3 3.0 75-125 35 <br /> Benzene 0.106 0.125 0.125 0.125 84.8 100.0 16.5 77-123 35 <br /> Toluene 0.116 0.124 0.125 0.125 92.8 99.2 6.7 78-122 35 <br /> Ethyl benzene 0.121 0.122 0.125 0.125 96.8 97.6 0.8 70-130 35 <br /> Xylene(s) 0.387 0.386 0.375 0.375 103.2 102.9 0.3 75-125 35 <br /> Surrogate(s) <br /> 4-Bromofluorobenzene-FI 405 459 500 500 81.0 91.8 58-124 <br /> i <br /> I <br /> i <br /> } <br /> 1220 Quarry Lane`Pleasanton,CA 94566-4756 <br /> Telephone:(925)484-1919Facsimile:(925)484-1096 <br /> Printed on:01103/200015:10 Page 4 of 5 <br /> I <br />