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r <br />�J <br />TRC Alton Geoscience- Irvine <br />Attn.: Anju Farfan <br />Gas/BTEX Fuel Oxygenates by 8260B <br />21 Technology Drive <br />Irvine, CA 92718 <br />Phone: (949) 341-7440 Fax: (949) 753-0111 <br />Project: 41050001 FA20 <br />Conoco Phillips # 01205 <br />Submission: 2005-04-0864 <br />Received: 04/27/2005 16:10 <br />Site: 16470 Cambridge Street Lathrop <br />Compound <br />Conc. u lL <br />Spk.Level <br />Recovery % Limits % <br />Flags <br />MS <br />MSD <br />Sample <br />u /L <br />MS <br />I MSD <br />RPD Rea <br />RPD <br />MS <br />MSD <br />Methyl tert-butyl ether <br />23.4 <br />24.1 <br />ND <br />25 <br />93.6 <br />96.4 <br />2.9 65-165 <br />20 <br />Benzene <br />23.8 <br />24.4 <br />ND <br />25 <br />95.2 <br />97.6 <br />2.5 69-129 <br />20 <br />Toluene <br />24.6 <br />23.7 <br />ND <br />25 <br />98.4 <br />94.8 <br />3.7 70-130 <br />20 <br />Surrogate(s) <br />1,2-Dichloroethane-d4 <br />418 <br />428 <br />500 <br />83.6 <br />85.6 <br />73-130 <br />Toluene -d8 <br />486 <br />492 <br />500 <br />97.2 <br />98.4 <br />81-114 <br />Severn Trent Laboratories, Inc. <br />STL San Francisco' 1220 Quarry Lane, Pleasanton, CA 94566 <br />Apert 01 S. em hent Plc Tel 925 484 1919 Fax 925484 1096 w www.sti-inc.com " CA DHS FLAP# 2496 . <br />05/17/2005 16:07 <br />Page 38 of 42 <br />