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1455 McDowell Blvd,North Ste D a— ) Sequoia Petaluma,CA 94954 (707)792 1865 Analytical FAX(707)792-0342 www sequoialabs com URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P309407 2870 Gateway Oaks Drive Suite 300 Project Number Intnm 50265 Reported Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/03 16 58 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical - Petaluma Reporting Analyte Result Linut Units Dilution Batch Prepared Analyzed Method Notes ATR-11 (P309407-11)Water Sampled 09/18/03 12 10 Received 09/19/03 15-25 Tert-amyl methyl ether ND 1 0 ug/I 1 3100050 10/02/03 10/02/03 BPA 8260B Benzene ND 050 " Tert-butyl alcohol ND 20 " Di-isopropyl ether ND 10 " Ethanol ND 100 " Ethylbenzene ND 050 " Ethyl tert-butyl ether ND 10 " Methyl tert-butyl ether ND 050 " Toluene ND 0 50 " Xylenes(total) ND 050 " Surrogate Dibromofluoromethane 99% 84-122 " Surrogate 1,2-Dtchloroethane-d4 108% 74-135 " Surrogate Toluene-d8 94% 84-119 " ATEX-1 (P309407-12)Water Sampled 09/18/03 13 40 Received 09/19/03 15 25 Wort-amyl methyl ether ND 1 0 ug/1 1 3100050 10/02/03 10/02/03 EPA 8260B Benzene ND 050 " Tert-butyl alcohol ND 20 " Di-isopropyl ether ND 1 0 " Ethanol ND 100 " Ethylbcnzene ND 050 " Ethyl tert-butyl ether ND 10 " Methyl tert-butyl ether ND 0 50 " Toluene ND 0 50 " Xylenes(total) ND 0 50 " Surrogate DibromoJluoromethane 97% 84-122 " Surrogate 1 2-Dtchloroethane-d4 107% 74-135 " Surrogate Toluene-d8 102% 84-119 " Sequoia Analytical -Petaluma The results in this report apply to the samples analyzed in accordance with the chain of custody document Unless otherwise stated results are reported on a wet weight basis This analytical report must be reproduced in its entirety Page 10 of 16