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WEI STL <br /> Submission 2005-08-0783 <br /> Gas/BTEX Compounds by 8015M18021 <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 /> Protect Kerlinger Received 08/26/2005 17 20 <br /> Batch QC Report <br /> Prep(s) 5030 Test(s) 8021 B <br /> Matrix Spike ( MS I MSD ) Water QC Batch#2005108130-01 05 <br /> MW-04 » MS Lab ID 2005-08-0783-001 <br /> MS 2005108/30-0105-030 Extracted 08/30/2005 Analyzed 08/30/2005 22 15 <br /> Dilution 1 00 <br /> MSD 2005/08130-01 05-031 Extracted 08/30/2005 Analyzed 08/30/2005 22 41 <br /> Dilution 1 00 <br /> Compound Cone u 1L S k Level Recove % Limits% Flags <br /> MS MSD Sample u /L MS MSD RPD Rec RPD MS MSD <br /> Benzene 493 484 ND 500 986 96 8 18 65-135 20 <br /> Toluene 48 4 478 ND 500 968 956 1 2 65-1135 20 <br /> Ethyl benzene 465 458 ND 500 930 91 6 1 5 65-135 20 <br /> Xylene(s) 138 137 ND 1500 920 913 0 8 65-135 20 <br /> Surrogate(s) <br /> Trifluorotoluene 484 470 500 968 94 0 58-124 <br /> Severn Trent Laboratories, Inc 08/31/2005 11 30 <br /> STL San Francisco*1220 Quarry Lane,Pleasanton CA 94566 <br /> A Part W Severn Trent P!c Tel 925 464 1919 Fax 926 484 1096*www stl-inc com*CA DHS ELAP#2496 Page 8 of 8 <br />