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5TL <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 1L <br />ISpk.Lvel <br />Recovery% <br />I Limits % <br />Flags <br />MS MSD I Sample <br />u 1L <br />MS <br />MSD <br />RPD <br />Rec. <br />RPD <br />MS <br />MSO <br />Methyl tert-butyl ether <br />22.0 24.6 ND <br />25 <br />88.0 <br />98.4 <br />11.2 <br />65-165 <br />20 <br />=Benzene <br />r24.8—:23-8—:ND <br />=25= <br />-99.2=:95.2= <br />_4.1= <br />:69_129= <br />_20= <br />Toluene <br />25.3 22.3 ND <br />25 <br />101.2 <br />89.2 <br />12.6 <br />70-130 <br />20 <br />—Surrogate(s) <br />1,2-0ichloroethane-d4 <br />445 447 <br />500 <br />89.0 <br />89.4 <br />73-130 <br />Toluene -d8 -- i <br />538 - 461 <br />500- <br />-107.6- <br />=92.2= <br />- _- - <br />-81-114- <br />Severn Trent Laboratories, Inc. <br />STI_ San Francisco " 1220 Quarry Lane, Pleasanton, CA 94566 <br />A part of Sevem Trent Plc Tel 925 484 1919 Fax 925 484 1096 ` www.stl-inc.com " CA DHS ELAP# 2496 <br />s <br />05/1712005 16:07 <br />Page 39 of 42 <br />