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1455 McDowell Blvd,North Ste 13 <br /> Ki Sequoia Petaluma,CA 94954 <br /> )— (707)792 1865 <br /> iqWAnalytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Hentage Site 11191,Stockton,Ca P304289 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/25/03 17 26 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B- Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lmut Units Level Result %REC Limits RPD Linut Notes <br /> Batch 3040403-EPA 5030,waters <br /> Matrix Spike Du (3040403-MSD1) Source P304224-01 Prepared&Analyzed 04/17/03 <br /> Gasoline Range Organics 2620 50 uSA 2750 87 92 65-135 2 20 <br /> Benzene 423 050 400 ND 106 65-135 2 20 <br /> Toluene 213 050 186 ND 115 65-135 4 20 <br /> Ethyibenzene 490 050 470 ND 104 65-135 2 20 <br /> Xylenes(total) 223 050 210 ND 106 65-135 1 20 <br /> Methyl tert-butyl ether 675 2 5 62 0 040 108 65-135 5 20 <br /> Surrogate a a a-Trifluorotoluene 351 300 117 65-135 <br /> Surrogate 4-Bromofluorobenzene 283 304 94 65-135 <br /> 0 <br /> 0Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 8 of 10 <br />