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Submission# 2001-12-0465 <br /> Gas/BTEX by 8015M/8021 <br /> Batch QC report <br /> ISTL San Francisro <br /> Test Method 8020 Prep Method 5030 1220 quarry Lane <br /> Pleasanton CA 94565 <br /> Laboratory Control Spike(LCS/LCSD) Water QC Batch#2001112131-01 05 Tel 925 464 1919 <br /> Fax 925 484 1096 <br /> LCS 2001112131-01 05-008 Extracted 12/31/2001 13 28 Analyzed 12/31/2001 13 28 www st[-inc com <br /> LCSD 2001112131-01 05-009 Extracted 12/31/2001 14 00 Analyzed 12/31/2001 14 00 www chrornalab com <br /> CA DHS ELAP#1094 <br /> Compound Conc [ug/Ll Exp Conc [ug/L] Recovery[°k] RPD Ctrl Umft[%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recovery RPD LCS LCSD <br /> Benzene 110 102 1000 1000 1100 1020 75 77-123 20 <br /> Toluene 101 934 1000 1000 1010 934 78 78.122 20 <br /> Ethyl benzene 104 970 1000 1000 1040 970 7 0 70-130 20 <br /> Xylenes) 303 285 300 300 1010 950 61 75-125 20 <br /> Surrogate(s) <br /> Tntluorotoluene 521 484 500 500 1042 968 58-124 <br /> STL San Francisco is a part of Severn Trent Laboratories Inc Page 7 of 8 <br />