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TL <br /> Submission 2404-12-0591 <br /> 000� <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 Kerlinger Received 12/15/2004 16 08 <br /> Batch QC Report <br /> Prep(s) 5030 Test(s) 8021 B <br /> Laboratory Control Spike Water QC Batch#2004/12122-1A 05 <br /> LCS 2004112122-1A 05-005 Extracted 12/2212004 Analyzed 12/22/2004 10 41 <br /> LCSD <br /> Compound Conc ug/L Exp Conc Recovery% RPD Ctrl Limits% Flags <br /> LCS LCSD LCS LCSD % Rec I RPD LCS LCSD <br /> Benzene 51 8 50 1036 77-123 20 <br /> Toluene 51 0 50 1020 78-122 20 <br /> Ethyl benzene 48 7 50 97 4 70-130 20 <br /> Xylene(s) 147 150 98 0 75-125 20 <br /> Surrogates(s) <br /> Tnfluorotoluene 1555 500 111 0 1 58-124 <br /> Severn Trent Laboratories, Inc 12126/20041427 <br /> STL San Francisco'1220 Quarry Lane,Pleasanton CA 94566 <br /> A part o,savemTrent Pk Tal 925 484 i919 Fax 925 484 1 096'www stl-inc corn*CA DNS ELAP#2498 Page 7 of 10 <br />