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Submission# 2002-08-0353 <br /> Gas/BTEX by 8015M/8021 111111-M-110R. Key," <br /> Compliance and Closure, Inc STL San Francisco <br /> 1220 Quarry Lane <br /> Attn Gary Mulkey Pleasanton,CA 94566 <br /> 7020 Koll Center Parkway Suite 134 <br /> Pleasanton, CA 94566-3107 Tel (925)484-1919 <br /> Phone (925) 426-5395 Fax (925) 426-5391 Fax (925)484-1096 <br /> www stl-inc corn <br /> Project 12118-6 Received 08/16/2002 14 02 www chromalab com <br /> Quik Stop#121 <br /> CA DHS FLAP#2496 <br /> Batch QC Report <br /> Prep(s) 5030 Test(s) 8021 B <br /> Laboratory Control Spike Water QC Batch #2002/08/23-01 02 <br /> LCS 2002/08123-01 02-004 Extracted 08/23/2002 Analyzed 08/23/2002 08 59 <br /> LCSD 2002108123-01 02-005 Extracted 08/23/2002 Analyzed 08/23/2002 09 32 <br /> Compound Conc ug/L Exp Conc Recovery RPDJ Ctrl Limits% Flags <br /> LCS LCSD LCS LCSD % Rec RPD LCS LCSD <br /> Benzene 890 861 1000 89 0 86 1 33 77-123 20 <br /> Toluene 895 867 1000 89 5 86 7 32 78-122 20 <br /> Ethyl benzene 889 87 7 1000 88 9 877 1 4 70-130 20 <br /> Xylene(s) 259 256 300 86 3 85 3 1 2 75-125 20 <br /> Surrogates(s) <br /> Tnfluorotoluene 454 438 500 90 8 876 58-124 <br /> 08/2312002 16 21 STL San Francisco is part of Severn Trent Laboratories Inc Page 21 of 23 <br />