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Sequoia 1455 McDowell Petaluma,CA 949544 Analytical (707707)7 FAX 7 92-342 www sequoialabs com ler-Ryan/Geostrategles(l) Project Unocal(4) Sterna Court, Suite 3 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-13(L205039-13)Water Sampled 05/08/02 17 30 Received 05/09/02 l8 50 R-05 Teri-butyl alcohol ND 40 ug/l 2 2050034 05/15/02 05/15/02 EPA 9260B Methyl tert-butyl ether ND 20 DI-isopropyl ether ND 20 " ^ Ethyl tert-butyl ether ND 20 ^ Teri-amyl methyl ether ND 20 " ^ Surrogate 1,2-Drchloroethane-d4 884% 70-130 " U-14(L205039-14)Water Sampled 05/07/02 15 15 Received 05/09/02 18 50 ^ Ten-butyl alcohol ND 20 ^ ugR 1 2050026 05/14/02 05/14/02 EPA 8260E Methyl tert-butyl ether ND 10 DI-Isopropyl ether ND 10 Ethyl tert-butyl ether ND l 0 Ten-amyl methyl ether ND 1 0 ^ Surrogate 1,2-Drchloroethane-d4 1000/0 70-130 " U-15 L205039-15 Water Sam led 05/07/02 16 03 Received 05/09/02 18 50 utyl alcohol ND 20 ug/I 1 2050026 05/14/02 05/14/02 EPA 8260B I tert-butyl ether ND 10 " Di-isopropyl ether ND 1 0 " ^ Ethyl Cert-butyl ether ND 1 0 'Pert-amyl methyl ether ND 1 0 Surrogate 1,2-Drchloroethane-d4 946% 70-130 " U-16(L205039-16)Water Sampled 05/07/02 16 50 Received 05_/_09/02 18 50 Tert-butyl alcohol ND 20 ug/l 1 2050028 05/14/02 05/14/02 EPA 8260B Methyl ten-butyl ether ND 10 ^ Di-Isopropyl ether ND 10 Ethyl ten-butylether ND 1 0 ^ Ten-amyl methyl ether ND 1 0 " ^ Surrogate 1,2-Drchloroethane-d4 996% 70-130 " la Analytical -San Carlos The results in this report apply to the samples anal3med in accordance with the chain of custody document This analytical report must be reproduced to its entirety Page 17 of 30