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a <br /> y Sequoia 1455 McDowell Blvd,North Ste D <br /> .Y� Petaluma,C94954 <br /> (707)792-1865 <br /> Analytical FAX(707) 42 <br /> • www.sequocatabs.cbs.com <br /> URS Corp-Sacramento Project:Arco Site 5450,Stockton,CA P405282 <br /> 2870 Gateway Oaks Drive Suite 300 Project Nurnber:WR36604 Reported: <br /> Sacramento CA,95833 Project ManagerNemon P.Elarth 06/02/04 14:08 <br /> Purgeable Hydrocarbons by EPA 8015B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %uREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4050570-EPA 5030B waters <br /> Blank(4050570-BLKI) Prepared&Analyzed:05/24/04 <br /> Gasoline Range Organics(C4-C 12) ND 50 ug/l <br /> Surrogate:4-Bromofluorobenzene 316 300 105 65-135 <br /> Laboratory Control Sample(4050570-BSI) Prepared&Analyzed:05/24/04 <br /> Gasoline Range Organics(C4-C12) 2500 50 ug/l 2750 91 65-135 <br /> Surrogate:4-Brornofluorobenzene 327 300 109 65-135 <br /> Matrix Spike(4050570-MS1) Source:P405267-02 Prepared&Analyzed:05/24/04 <br /> Gasoline Range Organics(C4-Cl2) 2400 50 ugll 2750 ND 87 65-135 <br /> Surrogate:4-Bromofluorobenzene 317 300 106 65-135 <br /> Matrix Spike Dup(4050570-MSD1) Source:P405267-02 Prepared&Analyzed:05/24/04 <br /> AlMasolin Range Organics(C4-C12) 2330 50 ug/l 2750 ND 85 65-135 3 20 <br /> W-Rurragate, 320 300 107 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 9 <br />