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1455 McDow Sit D <br /> Sequoia Petaluma,CA 949ell Blvd North <br />� ;/,,.����■1� 49544 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342342 <br /> • www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P406056 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/14/04 20 24 <br /> BTEX by EPA Method 8260B -Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> [Analyto Result Lumt Units Level Result °/.REC Limits RPD Limit Notes <br /> Batch 4FO7003-EPA 5030B PrF <br /> Matnx Spike Dup(4F07003-MSD]) Source MNE0696-01 Prepared 06/07/04 Analyzed 06/08/04 <br /> Benzene 586 50 u8/l 640 8 0 903 69-124 400 20 <br /> Toluene 3350 50 2970 13 112 78-129 552 20 <br /> Ethylbenzene 765 50 " ' 696 ND 110 84-132 0787 20 <br /> Xylenes(total) 3670 50 3370 ND 109 83-137 189 20 <br /> Surrogate I 1-Dichloroethane-d4 5 94 5 00 119 78-129 <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 14 of 20 <br />