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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> FAX(707)792-0342 <br /> Analytical www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P406422 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 07/15/04 10 23 <br /> Purgeable Hydrocarbons by EPA 8015B - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result 1 imt Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4060651 - EPA 5030B,waters <br /> Matrix Spike Dup(4060651-MSD1) Source P406451-07 Prepared&Analyzed 06/30/04 <br /> Gasoline Range Organics(C4-C12) 1900 50 ugll 2750 ND 69 65-135 05 20 <br /> Surrogate 4-Bromofluorobenzene 281 300 94 6S-135 <br /> uoia 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 12 of 18 <br />