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1455 McDowell Bivd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> FAX Analytical wwseg7) labscu2 <br /> www sequrnalabs coin <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnni-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 Units Dilution Batch Prepared Analyzed Method Note <br /> MS-3B(P406495-13)Water Sampled 06/24/04 21 35 Received 06/25/04 09 30 <br /> Benzene ND 2 5 ug/l 5 4GO8001 07/08/04 07/08/04 EPA 82608 <br /> Ethylbenzene ND 2 5 <br /> Toluene ND 25 <br /> Xylenes(total) ND 25 <br /> Surrogate 12-Dichloroethane-d4 87% 78-129 " <br /> MW-6(P406495-14)Water Sampled 06/24/04 02 43 Received 06/25/04 09 30 <br /> Benzene ND 050 ug/l 1 4GO7024 07/07/04 07/08/04 EPA 8260B <br /> Ethylbenzene ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 12-Dichloroethane-d4 109% 78-129 " <br /> VW-1 (P406495-16)Water Sampled 06/24/04 21 23 Received 06/25/04 09 30 <br /> Akenzene ND 5 0 ug/l 10 4008001 07/08/04 07/08/04 EPA 8260B <br /> hylbenzene ND 50 " <br /> Toluene ND 5 0 " <br /> Xylenes(total) ND 5 0 " <br /> Surrogate 12-Dichloroethane-d4 86% 78-129 " <br /> VW-2(P406495-17)Water Sampled 06/24/04 03 45 Received 06/25/04 09 30 <br /> Benzene ND 050 ugll l 40,07024 07/07/04 07/08/04 EPA 8260B <br /> Ethylbenzene ND 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate 1,2-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 as entirety <br /> Page 10 of 41 <br />