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1455 Mcbowell Blvd,North Ste a— ) Sequoia Petaluma,CA 949544 (707)792-1865 Analytical FAX(707)792-0342 www sequoialabs corn Gettler-Ryan/Geostrategies(1) Project Unoca](4) 6747 Sierra Court, Suite J Project Number Former Unocal#0187 Stockton Reported Dublin CA 94568 Project Manager Deanna Harding 05/24/02 16 38 Volatile Organic Oxygenated Compounds by EPA Method 8260B Sequoia Analytical - San Carlos Reporting _ Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes U-1 (L205039-01)Water Sampled 05/09/02 16 30 Received 05/09/02 18 50__ Teri-butyl alcohol ND 20 ug/1 1 2050026 05/13/02 05/13/02 EPA 8260B 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 934% 70-130 " U-2 (L205039-02)Water Sampled 05/09/02 16 00 Received 05/09/02 18 50 Tert-butyl alcohol ND 20 ug/i 1 2050026 05/13/02 05/13/02 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-Dichloroethane-d4 103% 70-130 " U-3 L205039-03 Water 'Sam' led 05/09/02 15 25 Received 05/09/02 18 50" - Tert-butyl alcohol ND 20 ug/l 1 2050026 05/13102 05/13/02 EPA 8260B Methyl tert-butyl ether ND 1 0 Di-isopropyl ether ND i 0 Ethyl tert-butyl ether ND 1 0 _Tert-amyl methyl ether ND 1 0 " Surrogate 12-Dichloroethane-d4 956% 70-130 " T`U-4`(1-205039-04)Wateir`Sampled 05/07/02 12 40�Received-05/09102 18 50— Tert-butyl alcohol - T T NDT� 20 ug/l 1__-2050026 T05/13/02� 05/13/02 EPA 82_60B. T Methyl teri-butyl ether ND _ 10 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 102% 70-130 " Sequoia Analytical - San Carlos The results in this report appb to the samples analyzed in accordance with the chain custody document This analytical report must be reproduced in its entirety Page 14 of 30