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1455 McDowell Blvd North Ste D a— ) Sequoia Petaluma,CA 94954 (707)792-1855 Analytical FAX(707)792-0342 www sequoialabs coin 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 Total Petroleum Hydrocarbons as Gasoline by EPA 8015B Sequoia Analytical- Petaluma Reporting Analyte Result Limit Units Dilutmn Batch Prepared Analyzed Method Notes ATR-8(P309407-08)Water Sampled 09/18/03 15 00 Received 09/19/03 15 25 Gasoline Range Organics 230 50 ug/l 1 3090610 09/26/03 09/26/03 EPA 8015B-VOA Surrogate 4-Bromofluorobenzene 97% 65-135 " ATR-9(P309407-09)Water Sampled 09/18/03 12 55 Received 09/19/03 15 25 Gasoline Range Organics ND 50 ugll 1 3090610 09/26/03 09/26/03 EPA 80158-VOA Surrogate 4-Bromofluorobenzene 93% 65-135 " ATR-10(P309407-10)Water Sampled 09/18/03 12 35 Received 09/19/03 15 25 Gasoline Range Organics ND 50 ug/1 1 3090610 09/26/03 09/26/03 EPA 80153 VOA Surrogate 4-Bromofluorobenzene 92% 65-135 " ATR-ll (P309407-11)Water Sampled 09/18/03 12 10 Received 09/19/03 15 25 AlIlIkkCiasoline Range Organics ND 50 ug/1 1 3090610 09/26/03 09/26/03 EPA 8015B-VOA Surrogate 4-Bromofluorobenzene 88% 65-135 " ATEX-1 (P309407-12)Water Sampled 09/18/03 13 40 Received 09/19/03 15 25 Gasoline Range Organics ND 50 ug/I I 3090610 09/26/03 09/26/03 EPA 8015B-VOA Surrogate 4-Bromofluorobenzene 90% 65-135 " ATR-12(P309407-13)Water Sampled 09/18/03 11 45 Received 09/19/03 15 25 Gasoline Range Organics ND 50 ug/1 1 3090610 09/26/03 09/26/03 EPA 8015B-VOA Surrogate 4-Bromofluorobenaene 92% 65-135 " 11 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 4 of 16