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it3y a� 1455 McDowell Blvd.North,Ste.D Sequoia Petaluma, -1865 94954 (707)79 2-1865 FAX(707)792-0342 via Analytical www.sequoialabs.corrt Cambria Environmental-Oakland Project: Equiva 1144 65th St.,Suite C Project Number: 341 E. Main Street,Ripon Reported: Oakland CA,94608 Project Manager: Darryk Ataide 10/11700 16:59 Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015NV8020M Sequoia Analytical - Petaluma Reporting Anaiyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes 1-1 (P010072-01)Water Sampled: 10/04/00 08:00 Received: 10/04/00 14:50 Gasoline ND--250—ug/1-5-0'1'001'1-6-1'0105/00-10105/00—EP 8015M/8020M Benzene ND 2.50 Toluene ND 2.50 Ethylbenzene ND 2.50 " Xylenes(total) ND 2.50 " Methyl tert-butyl ether 389 12.5 Surrogate:a,a,a-Trifluorololuene 108% 65-135 Surrogate: 4-Bromofluorobenzene 89,0% 65-135 A-1 (P010072-02)Water Sampled: 10/04/00 08.00 Received: 10/04/00 14:50 Gasoline ND 50.0 ug/l 1 0100116 10/05/00 10/05/00 EPA 8015M/8020M Benzene ND 0.500 Toluene ND 0.500 " Ethylbenzene ND 0.500 " Xylenes(total) ND 0.500 " Methyl tert-butyl ether ND 2.50 Surrogate:a,a,a-Trifluorololuene 105% 65-135 " Surrogate: 4-Bromofluorobenzene 88.3% 65-135 " B-1 (P010072-03)Water Sampled: 10/04/0008:00 Received: 10/04/00 14:50 Gasoline ND 50.0 ug/I 1 0100116 10/05/00 10/05/00 EPA 8015M18020M Benzene ND 0.500 " Toluene ND 0.500 " Ethylbenzene ND 0.500 " Xylenes(total) ND 0.500 " Methyl tert-butyl ether ND 2.50 " .Surrogate:a,a,a-Trifluorotoluene 107% 65-135 " Surrogate: 4-Bromofluorobenzene 89.3% 65-135 Sequoia Analytical-Petaluma The results in this report apply 10 the samples analyzed in accordance with the chain custody document. This analytical report must be reproduced in its entirely. a Page 2 of 9