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• <br />Gas/BTEX Fuel Oxygenates by 8260B <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. ug/L <br />Exp.Conc. <br />Recovery % <br />RPD CtrI.0 its % Flags <br />LCS LCSD LCS LCSD % Rec. RPD LCS <br />LCSD <br />Methyl tert-butyl ether (MTBE) <br />20.6 <br />25 <br />82.4 <br />65-165 <br />20 <br />Benzene <br />22.4 <br />25 <br />89.6 <br />69-129 <br />20 <br />Toluene <br />22.9 <br />25 <br />91.6 <br />70-130 <br />20 <br />Surrogates(s) <br />1,2-Dichloroe than e -d4 <br />415 <br />500 <br />83.0 <br />73-130 <br />Toluene -d8 <br />456 <br />500 <br />91.2 <br />81-114 <br />Severn Trent Laboratories, Inc. <br />STL San'Francisco i 1220 Quarry Lane, Pleasanton, CA 94566 <br />Ap®rt013e -mTrentPlc Tel 925 484 1919 Fax 925484 1096' www.stl-inc.com * CA DHS ELAP# 2496 <br />05/17/2006 16:07 <br />Page 32 of 42 <br />