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/ 1455 McDowell Blvd,North Sequoia Petaluma CASte (D (707)CA 949544� FAX Analytical 792-(707)792-03420342 www sequoialabs com er-Ryan/Geostrategies(1) Project Unoca](4) Sierra Court, Suite J Project Number Fortner Unocal#10187,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 Analvte Result Limit Units Dilution Batch Prepared Analyzed Method Notes U-21 (L205039-21)Water Sampled _05108102 15 30 Received 05/09/02 18 50 Tert-butyl alcohol ND 20 ug/I 1 2050028 05/14/02 05/14/02 EPA 9260B Methyl tent-butyl ether ND 10 " DI-isopropyl ether 2 2 10 ^ " Ethyl tert-butyl ether ND 1 0 " Tert-amyl methyl ether ND 1 0 ^ Surrogate 1,2-Dichloroethane-d4 100% 70-130 " _U-22 (L205039-22)Water Sampled 05/08/02 10 05 Received 05/09/02 18 50 Tert-butyl alcohol ND 20 ugll 1 2050028 05/14/02 05/14/02 EPA 8260B Methyl tert-butyl ether ND I 0 Di-isopropyl ether ND 10 " Ethyl ten-butyl ether ND 10 " Tert-amyl methyl ether ND 10 " Surrogate 1,1-Dichloroethane-d4 100% 70-130 " U- L205039-23 Water Sam led 05/08/132 1 0 50 Received 05/09/02 18 50 Mtyl alcohol ND 20 ug/1 1 2050028 05/14/02 05/14/02 EPA 82605 et YMet yl tert-butyl ether ND 1 0 ^ " Di-isopropyl ether I 1 1 0 ^ " Ethyl tert-butyl ether ND 1 0 " Tert-amyl methyl ether ND 1 0 " Surrogate 1,1-Dichloroethone-d4 978% 70-130 " U-24(L205039-24)Water Sampled_ 05/08/02 I1 40 Received 05/09/02 l8 50 Tert-butyl alcohol ND 20 ug/l _ 1 2050028 05/14/02 05/14/02 EPA 8260B Methyl tent-butyl ether ND 1 0 " Di-isopropyl ether ND 1 0 " Ethyl tert-butyl ether ND 1 0 " Teri-amyl methyl ether ND 1 0 Surrogate I1-Dichloroethane-d4 962 % 70-130 " la Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain of custody document This analytical report must be reproduced in its entirety Page 19 of 30