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Submission 2005-0$-0736 <br /> STL <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 08/25/2005 16 35 <br /> Batch QC Report <br /> Test(s) 8021 B <br /> Prep(s) 5030 <br /> Matrix Spike ( MS 1 MSD ) Water OC Batch#2005!08!26-Vii 05 <br /> Lab ID 2005-08-0721 -001 <br /> MS/MSD <br /> MS 2005108126-V1 05-025 Extracted 08/26/2005 Analyzed o812612oa5 20 02 <br /> Dilution 1 00 <br /> MSD 2005108126-V1 05-026 Extracted 08/26/2005 Analyzed 08/26/2005 20 29 <br /> Dilution 1 00 <br /> Compound Conc u !L SpkTLeveRecovery% Limits% Fla s <br /> Ms MSD Sample uMSD RPD Rec RPD MS MSD <br /> Benzene 495 50 5 ND 10, 0 20 65-135 20 <br /> Toluene 492 505 ND 101 0 2 6 65-135 20 <br /> Xylene(s) 142 147 ND 980 34 65-135 20 <br /> Ethyl benzene 474 480 ND 50 948 960 13 65-135 20 <br /> Surrogate(s) <br /> Trifluorotoluene 498 526 500 99 fi 105 2 58-124 <br /> � Severn Trent Laboratories, Inc 09/082005 0$51 <br /> STL San Francisco" 1220 Quarry Lane Pleasanton,CA 94566 Page 5 of 5 <br /> APah ei Se Trani Plc Tel 925 484 1919 Fax 925 484 1096-www stl-inc corn'CA DHS ELAP#2496 <br />