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Road Sequoia 1551 nCarloIndustrialCA94070 San Carlos CA 94070 (650)232-9600 Analytical FAX(650)232-9612 www sequpialabs corn ler-Ryan/Gcostralegi es(I) Project Unoca](4) L208033 Sierra Court,Suite J Project Number Former Unocal 40187, 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 Analyte Result Limit Units Dilution Batch Prepared Analvzed Method Notes U-9 L208033-10 Water Sampled 08/14/02 12 25 Received 08/14/02 19 55 Tert-butyl alcohol ND 20 ug/l 1 2080016 08/15/02 08/15/02 EPA 8260B Methyl tert-butyl ether ND 1 0 Di-isopropyl ether ND 1 0 " Ethyl tert-butyl ether ND 1 0 " Tert-amyl methyl ether ND 1 0 " Surrogate 1 2-Dtchloroethane-d4 116% 70-130 " U-10(1-208033-11)Water Sampled 08/14/02 11 10 Received 08/14/02 19 55 Tert-butyl alcohol ND 20 ug/1 1 2080016 08/15/02 08/15/02 EPA 8260E Metbyl tert-butyl ether ND 1 0 " Di-isopropyl ether ND 1 0 Ethyl tert-butyl ether ND 1 0 Tert-amyl methyl ether ND 1 0 " Surrogate 1,2-Dichloroethane-d4 110% 70-130 " U-11 1..208033-12 Water Sampled 08/14/02 14 10 Received 08/14/02 19 55 Putyl alcohol ND 20 ugfl 1 2080016 08/15/02 08/15/02 EPA 8260B hyl tert-butyl ether ND 1 0 " Di-isopropyl ether ND 1 0 Ethyl tert-butyl ether ND 1 0 " Tert-amyl methyl ether ND 1 0 " Surrogate 1,2-Dtchloroethane-d4 112% 70-130 " U_-12(L208033-13)Water Sampled 08/14/02 14 55 Received 08/14/02 19 55 Tert-butyl alcohol 29 20 ug/1 1 2080016 08/15/02 08/15/02 EPA 8260B Methyl tert-butyl ether ND 1 0 Di-isopropyl ether 44 1 0 Ethyl tert-butyl ether ND l 0 " Tert-amyl methyl ether ND 1 0 Surrogate 1,2-Dtchloroethane-d4 III % 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 weight basis This analytical report must be reproduced in its entirety Page 6 of 36