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j1 Sequoia 1455McDawP Blvd North Ste <br /> Petaluma,CA 949544 <br /> (707)792-1865 <br /> FAX 342 <br /> Analytical wwseq oialab corn <br /> www saqurnalabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 17 56 <br /> BTEX by EPA Method 8260B <br /> Sequoia Analytical- Morgan Hill <br /> Reporting <br /> Analyte Result Limit Uruts Dilution Batch Prepared Analyzed Melbod Not <br /> VW-8(P406495-22)Water Sampled 06/24/04 21 58 Received 06/25/04 09 30 <br /> Benzene 2 6 25 ugll 5 4GO8001 07/08/04 07/08/04 EPA 82608 <br /> Ethylbenzene ND 2 5 " <br /> Toluene ND 2 5 " <br /> Xylenes(total) ND 2 5 " <br /> Surrogate 1,2-Dichloroethane-d4 86% 78-129 " <br /> VW-10(P406495-23)Water Sampled 06/24/04 22 20 Received 06/25/04 09 30 <br /> Benzene ND 2 5 ugll 5 4608001 07/08/04 07/08/04 EPA 826013 <br /> Ethylbenzene ND 2 5 " <br /> Toluene ND 2 5 " <br /> Xylenes(total) ND 2 5 " <br /> Surrogate 12-D:chloroethane-d4 80% 78-129 " <br /> VW-12(P406495-24)Water Sampled 06/24/04 03 22 Received 06/25/04 09 30 <br /> lnzene ND 050 ugA 1 4GO7024 07/07/04 07/07/04 EPA 8260B <br /> hylbenzene ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 12-Dichloroethane-d4 114% 78-129 " <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 12 of 41 <br />