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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> 1W Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Hentage Site 11194,Tracy,Ca P305041 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/15/03 20 30 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B -Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %aREC RPB <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3050237-EPA 5030,waters <br /> Matrix Spike Du 3050237-MSDI Source P305041-01 Prepared&Analyzed 05/09/03 <br /> Gasoline Range Organics 2570 50 u9/1 2750 ND 93 65-135 4 20 <br /> Benzene 43 4 0 50 400 ND 108 65-135 4 20 <br /> Toluene 215 0 50 186 0 13 116 65-135 3 20 <br /> Ethylbenzene 51 1 0 50 " 470 ND 109 65-135 2 20 <br /> Xylenes(total) 235 050 210 ND 112 65-135 3 20 <br /> Methyl tert-butyl ether 767 2 5 62 0 046 123 65-135 10 20 <br /> Surrogate a a a-Tris luorotoluene 341 300 114 65-135 <br /> Surrogate 4-Bromofluorobenzene 297 " 300 99 65-135 <br /> • <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 11 of 13 <br />