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Submission# 2002-08-0353 <br /> Gas/BTEX by 8015MI8021 <br /> Compliance and Closure, Inc STL San Francisco <br /> 1220Quarry 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 DFiS ELAP#2496 <br /> Batch QC Report <br /> Prep(s) 5030 Test(s) 8021 B <br /> Laboratory Control Spike Water QC Batch #2002108119-01 04 <br /> LCS 2002108/19-01 04-004 Extracted 08/19/2002 Analyzed 08/19/2002 08 34 <br /> LCSD 2002108119-01 04-005 Extracted 08/19/2002 Analyzed 08/19/2002 08 59 <br /> Compound Conc ug/L. Exp Conc Recovery RPDJ Ctrl Limits%I Flags <br /> LCS LCSD LCS LCSD % I Rec I RPD LCS LCSD <br /> Benzene 992 954 1000 992 954 3 9 77-123 20 <br /> Toluene 989 955 1000 989 95 5 3 5 78-122 20 <br /> Ethyl benzene 966 93 6 1000 966 936 3 2 70-130 20 <br /> Xylene(s) 278 270 300 927 900 3 0 75-125 20 <br /> Surrogates(s) <br /> Tnfluorotoluene 526 499 500 11052 1998 1 158-1241 <br /> 08/23/2002 16 21 STL San Francisco is part of Severn Trent Laboratories Inc Page 17 of 23 <br />