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�© STL Submission 2005-08-0783 <br /> Gas/BTEX Compounds by 8015MI8021 <br /> CEMEX <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 08/26/2005 17 20 <br /> Batch QC Re ort <br /> Prep(s) 5030 Test(s) 8021 B <br /> Laboratory Control Spike Water QC Batch#2005108130-01 05 <br /> LCS 2005108130-01 05-004 Extracted 08/30/2005 Analyzed 08/30/2005 10 22 <br /> LCSD <br /> Compound Conc ug/L Exp Conc Recovery% RPD Ctrl Limits% Flags <br /> LCS LCSD LCS LCSD % Rec RPD LCS LCSD <br /> Benzene 479 50 0 95 8 77-123 20 <br /> Toluene 481 500 962 78-122 20 <br /> Ethyl benzene 471 500 942 70-130 20 <br /> Xylene(s) 143 150 95 3 75-125 20 <br /> Surrogates(s) <br /> Trifluorotoluene 522 500 1044 58-124 <br /> Severn Trent Laboratories, Inc 09/1212005 14 44 <br /> STL San Francisco*1220 Quarry Lane Pleasanton CA 94566 <br /> A Pari of Trend PIC Tel 925 484 1919 Fax 925 484 1096*www stl-inc com*CA DHS ELAP#2496 Page 7 of 8 <br />