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CHROMALAB VC. submission #: 1999-07-0487 <br /> Environmental Services(SDB) <br /> To: Earth Systems Consultants Test Method: 8020 <br /> L Attn: Jeanne Buckthal Prep Method: 5030 <br /> Batch QC Report <br /> Gas/BTEX (Methanol Extraction) <br /> LLaboratory Control Spike (LCS/LCSD) Soil QC Batch #1999/08/02-05.02 <br /> LCS: 1999/08/02-05.02-002 Extracted: 08/02/199910:07 Analyzed: 08/02/199910:07 <br /> LCSD: 1999/08/02-05.02-003 Extracted: 08/02/199911:03 Analyzed: 08/02/199911:03 <br /> Compound Conc. [mg/Kg] Exp.Conc. [mg/Kg] Recovery[%] RPD Ctri. Limits[%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recovery ;RPD LCS LCSD <br /> Benzene 0.148 0.144 0.125 0.125 : 118.4 115.2 2.7 77-123 35 <br /> Toluene 0.152 0.150 0.125 0.125 1121.6 120.0 1.3 78-122 35 <br /> Ethyl benzene 0.160 0.156 0.125 0.125 128.0 124.8 2.5 70-130 35 <br /> Xylene(s) 0.387 0.380 0.375 0.375 103.2 101.3 1.9 75-125 35 <br /> Surrogate(s) <br /> r4Bromofluorobenzene-FI 435 440 500 500 87.0 88.0 58-124 <br /> II <br /> f <br /> i..i <br /> I <br /> I <br /> I <br /> 1220 Quarry Lane'Pleasanton,CA 94566-4756 <br /> Telephone:(925)4841919-Facsimile:(925)484-1096 <br /> (" Printed on:08/06/1999 09:40 Page 5 of 5 <br />