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1455 McDowell Blvd,North Ste D <br /> c <br /> Sequoia Petaluma,CA 94954 <br /> a— ) (707)792-1865Analytical <br /> FAX(707)792-03420342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5450,Stockton,CA P402594 <br /> 2870 Gateway Oaks Drive Suite 300 Project Ntnnber: WR36604 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 03/12/04 16:07 <br /> Purgeable Hydrocarbons by EPA 8015B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %RBC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4030078-EPA 5030B,waters <br /> Blank(4030078-BLKI) Prepared&Analyzed:03/03/04 <br /> Gasoline Range Organics ND 50 ug/I <br /> Surrogate:4-Bromofluorobenzene 289 300 96 65-135 <br /> Laboratory Control Sample(4030078-BS1) Prepared&Analyzed:03/03/04 <br /> Gasoline Range Organics 2150 50 ugfl 2750 78 65-135 <br /> Surrogate:4-BromoJluorobenzene 297 300 99 65-135 <br /> Matrix S ike(4030078-MSI) Source:P402545-03 Prepared&Analyzed:03/03/04 <br /> Gasoline Range Organics 2070 50 ugll 2750 19 75 65-135 <br /> Surrogate:4-BromoJluorobenzene 287 300 96 65-135 <br /> Matrix Spike Dup(4030078-MSDI) Source:P402545-03 Prepared:03/03/04 Analyzed:03/04/04 <br /> Gasoline Range Organics 2000 50 ug/1 2750 19 72 65-135 3 20 <br /> urrogate:4-Bromo luorobenzene 287 300 96 65-135 <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 6 of 11 <br />