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l <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> �i)— (707)792-1865 <br /> (Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project:Arco Site 2130,Stockton,CA P504010 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:GOBZK-0002 Reported: <br /> Sacramento CA,95833 Project Manager:Vemon P.Elarth 04/13/05 09:46 <br /> Purgeable Hydrocarbons by EPA 8015B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source °/oREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 50400,54-EPA 5030B,waters 1 EPA 8015B-VOA <br /> Matrix Spike Dup(5040054-MSDI) Source:P504013-03 Prepared&Analyzed:04/06/05 <br /> Gasoline Range.Organics(C4-Cl2) 2330 50 ugll 2750 ND 85 60.9-120 2 20 <br /> Surrogate:4-Bromofluorobenzene 305 300 101 80-110 <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 20 of 29 <br />