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Sequoia 1455 McpowBlvd North Ste <br /> Petaluma CA 949544 <br /> (707)792-1865 <br /> (D— Analytical FAX(707)792-0342 <br /> www sequotalabs win <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P405138 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/27/04 18 30 <br /> Purgeable Hydrocarbons by EPA 8015B - Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Loma Units Level Result %REC Limits RPD Limit Notes <br /> Gatch 4050403-EPA 5030B,waters _ <br /> Matrix Spike Du (4050403-MSD1) Source P405163-02 Prepared&Analyzed 05/18/04 <br /> Gasoline Range Organics(C4-C12) 2160 50 ug/I 2750 ND 79 65-135 3 20 <br /> Surrogate 4-Bromofluorobenzene 337 300 112 55-135 <br /> • <br /> Sequoia 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 11 <br />