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1551 Industrial Road Sequoia San Carlos CA 94070 �a_ Analytical (650)232-9600 FAX(650)232-9612 www sequoiaiabs Com ler-Ryan/Geostrategies(1) Project Unocal(4) L208033 7 Sierra Court, Suite J Projecl Number Former Unocal#0187,Stockton Reported Dublin CA, 94568 Project Manager Deanna Harding 08/29/02 07 10 Volatile Organic Oxygenated Compounds by EPA Method 8260B Sequoia Analytical - San Carlos Reporting Analytic Result Limit Units Dilution Batch Prepared Analyzed Method Notes U-17(L208033-18)Water Sampled 08/12/02 17 50 Received 08/14/02 19 55 Tert-butyl alcohol ND 20 ug/1 1 2080016 08/15/02 08/15/02 EPA 8260E Methyl tert-butyl ether ND 1 0 ^ Di-isopropyl ether ND 10 " Ethyl tert-butyl ether ND 10 Teri-amyl methyl ether ND 10 " Surrogate 1,2-Dichloroethane-d4 115% 70-130 " U-18(L208033-19)Water_ Sampled 08113/021245 Received 08/14/02 19 55____ Teri-butyl alcohol ND 20 ug/l 1 2080017 08/16/02 08/16/02 EPA 8260B Methyl terl-butyl ether ND 1 0 Di-isopropyl ether ND 10 Ethyl tert-butyl ether ND 10 " Tert-amyl methyl ether ND 10 Surrogate 1,1-Dichloroethane-d4 114% 70-130 " U- (1.208033-20)Water Sampled 08/13/02 14 20 Received 08/14/02 19 55 utyl alcohol ND 20 ugA 1 2080017 08/16/02 08/16/02 EPA 8260B Methyl tert-butyl ether ND 1 0 " Di-isopropyl ether 17 10 Ethyl tert-butyl ether ND 10 " Tert-amyl methyl ether ND 1 0 Surrogate 1 2-Dichloroethane-d4 114% 70-130 " U-20(L208033-21)Water Sampled 08/13/02 13 30 Received 08/14/02 19 55 _- Tert-butyl alcohol ND 20 ug/1 1 2080017 08/16/02 08/16/02 EPA 8260B Methyl tert-butyl ether ND 1 0 " ^ Di-isopropyl ether ND 10 " ^ Ethyl tert-butyl ether ND 10 ^ Tert-amyl methyl ether ND 1 0 " Surrogate 1,1-Dichloroethane-d4 114% 70-130 " to Analytical - San Carlos 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 weighi basis This analytical report must be reproduced in its entirety Page 8 of 36