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f) <br />• <br />Gas/BTEX Fuel Oxygenates by 82608 <br />TRC Alton Geoscience- Irvine <br />Attn.: Anju Farfan <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 <br />Spk.Level <br />Recove % <br />Limits % <br />Flags <br />MS MSD <br />Sample <br />u /L <br />MS <br />MSD <br />RPD <br />Rec. <br />RPO <br />MS <br />I MSD <br />Methyl tert-butyl ether <br />22.7 26.2 <br />1.02 <br />25 <br />86.7 <br />100.7 <br />14.9 <br />65-165 <br />20 <br />Benzene <br />18.9 23.3 <br />ND <br />25 <br />75.6 <br />93.2 <br />20.9 <br />69-129 <br />20 <br />R1 <br />Toluene <br />21.4 24.7 <br />ND <br />25 <br />85.6 <br />98.8 <br />14.3 <br />70-130 <br />20 <br />Surrogate(s) <br />1,2-Dichloroethane-d4 <br />474 452 <br />500 <br />94.8 <br />90.4 <br />73-130 <br />Toluene -d8 <br />480 470 <br />500 <br />96,0 <br />94.0 <br />1 <br />81-114 <br />A p- of Severn Trent Plc <br />Severn Trent Laboratories, Inc. <br />STL San Francisco* 1220 Quarry Lane, Pleasanton, CA 94566 <br />Tel 925 484 1919 Fax 925 484 1096 * www.st]-inc.com * CA DHS BLAP# 2496 <br />05/17/2005 16:07 <br />Page 36 of 42 <br />