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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (i) (707)792-1865 <br /> Analytical FAX(707)792.0342 <br /> www.sequoialabs.com <br /> j URS Corp-Sacramento Project: Arco Site 5450,Stockton,CA P308382 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36604 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 09/03/03 15:55 <br /> Total Petroleum Hydrocarbons as Gasoline by EPA 8015B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3080543-EPA 5030,waters <br /> Blank(3080543-BLK1) Prepared&Analyzed:08/27/03 <br /> Gasoline Range Organics ND 50 ugll <br /> Surrogate:4-Bromofluorobenzene 285 300 95 65-135 <br /> Laboratory Control Sample 3080543-BSI) Prepared&Analyzed:08/27/03 <br /> Gasoline Range Organics 2490 50 ugll 2750 91 65-135 <br /> Surrogate:4-Bromofluorobenzene 291 300 97 65-135 <br /> Matrix Spike 3080543-MS] Source:P308498-01 Pre ared&Analyzed:08/27/03 <br /> Gasoline Range Organics 2500 50 ugfl 2750 ND 91 65-135 <br /> Surrogate:4-Bromofluorobenzene 291 300 97 65-135 <br /> Matrix Spike Du 3080543-MSD1 Source:P308498-01 Prepared&Analyzed:08/27/03 — <br /> Gasoline Range Organics 2010 50 ug/l 2750 ND 73 65-135 ( 22 20 QR-02 <br /> 0"'agale:4-Bromofluorobenzene 242 300 81 65-135 <br /> Um <br /> i <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirely. <br /> Page 6 of 9 <br />