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Submission# 2004-06-0354 <br /> STL <br /> GasIBTEX Compounds by 8015M18021 <br />' RMC Pacific Materials, Inc <br /> Attn Robert Aldenhuysen <br />' P O Box 5252 <br /> Pleasanton, CA 94566 <br /> Phone (925) 426-2261 Fax (925)426-2231 <br />' Project Kerhnger Received 06/1012004 20 05 <br /> Batch QC Re ort <br /> Prep(s) 5035 Test(s) 8021 B <br />' Laboratory Control Spike $oil QC Batch#2004106111-02 01 <br /> LCS 2004106111-02 01-036 Extracted 06112/2004 Analyzed 06/12/2004 12 47 <br /> LCSD 2004106/11-02 01-037 Extracted 06/12/2004 Analyzed 06/12/2004 13 23 <br /> Compound Conc mg/Kg Exp Conc Recovery% RPD Ctrl Limits% Flags <br /> LCS LCSD LCS LCSD % Rec RPD LCS LCSD <br /> I Benzene 0 101 00983 0 1000 1010 983 2 7 77-123 35 <br /> Toluene 0 101 00990 01000 1010 990 2 0 78-122 35 <br /> Ethyl benzene 0 102 0100 01000 1020 1000 2 0 70-130 35 <br /> I Xylene(s) 0 303 0 292 0 300 1010 973 37 75-125 35 <br /> Surrogates(s) <br /> Trifluorotoluene 1544 1534 500 1088 1068 53-125 <br /> r <br /> 1 <br /> I <br /> I <br /> Severn Trent Laboratories, Inc 06/16/2004 14 30 <br /> I STL San Francisco*1220 Quarry Lane,Pleasanton CA 94566 <br /> A Pan of S—rr Tent Pk Tel 925 484 1919 Fax 925 484 1 096*www stl-inc cam*CA OHS ELAP#2496 Page 35 of 40 <br />