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a— ) (707) 1455 McDowell Blvd North Ste D Sequoia Petaluma CA 94954 Analytical FAX 7921865 707)792-0342 www sequoialabs com Secor-Rancho Cordova Project Arco Site 2133 P306554 3017 Kllgare Road Suite 100 Project Number 38982 Reported Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/02/03 18 02 Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B18021B Sequoia Analytical-Petaluma Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes BAD-1 (P306554-07)Water Sampled 06/17/03 12 42 Received 06/23/03 13 35 Gasoline Range Organics ND 100 ug/l 2 3060704 06/27/03 06/27/03 EPA 8015B/8021 B Benzene ND 10 " Toluene ND 10 Ethylbenzene ND 10 Xylenes(total) ND 10 Methyl tert-butyl ether 250 5 0 Surrogate a a a-Trifluorotoluene 102% 65-135 " Surrogate 4-Bromofluorobenzene 89% 65-135 " MW4(P306554-08)Water Sampled 06118/03 12 05 Received 06/23/03 13 35 Gasoline Range Organics ND 50 ug/l 1 3060704 06/27/03 06/27/03 EPA 8015B/8021 B Benzene ND 0 50 oluene ND 0 50 Ethylbenzene ND 0 50 Xylenes(total) ND 0 50 Methyl tert-butyl ether ND 2 5 Surrogate a a a-Trifluorotoluene 104% 65-135 " Surrogate 4-Bromofluorobenzene 89% 65-135 " MW-5(P306554-09)Water Sampled 06/18/03 08 00 Received 06/23/03 13 35 Gasoline Range Organics ND 50 ugA 1 3060704 06/27/03 06/27/03 EPA 8015B18021B Benzene ND 0 50 Toluene ND 050 Ethylbenzene ND 050 Xylenes(total) ND 050 Methyl tert-butyl ether ND 2 5 " Surrogate a a a-Trifluorotoluene 101% 65-135 Surrogate 4-Bromofluorobenzene 94% 65-135 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 5 of l l