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Gettler-Ryan/Geostrategies(1) Project Unocal(4) 6747 Sierra Court,Suite 3 Project Number Former Unocal SS#l0187 Reported Dublin CA,94568 Project Manager Deanna Harding 05/30/01 13 32 Volatile Organic Oxygenated Compounds by EPA Method 8260B Sequoia Analytical- San Carlos Reporting Analyte Result lint Units Dilution Batch Prepared Analyzed Method Notes U-17(L105144-18)Water Sampled 05/14/0115 23 Received:05/16/0119 45 Tert-butyl alcohol ND 100 ug/l 1 1050084 05/19/01 05/19/01 EPA 8260B Methyl tert-butyl ether ND 200 ItIt Di-isopropyl ether ND 200 It It Ethyl tert-butyl ether ND 200 , Tert-amyl methyl ether ND 200 " Surrogate 1,2-Dtchloroethane-d4 866 % 76-114 U-18(L105144-19)Water Sampled 05115/0113-55 Received:05/1610119 45 Tert-butyl alcohol ND 100 u0 1 1050084 05/19/01 05/19/01 EPA 8260B Methyl tert-butyl ether ND 200 It " It Di-isopropyl ether ND 200 It Ethyl tert-butyl ether ND 200 J -amyl methyl ether ND 200 gate 1,2-D:chloroethane-d4 868 % 76-114 " U-19(L105144-20)Water Sampled 05/15/0117-40 Received 05/16/0119 45 Tert-butyl alcohol ND 100 ug/l 1 1050085 05/21/01 05/21/01 EPA 8260B Methyl tert-butyl ether ND 200 " It It Di-isopropyl ether 353 200 " n Ethyl tert-butyl ether ND 200 " Tert-amyl methyl ether ND 200 " Surrogate 42 Dtchloroethane-d4 908% 76-114 U-20(1,105144-21)Water Sampled 05/15/0114-45 Received 05/16/01 19.45 Tert-butyl alcohol ND 100 ug/l 1 1050084 05/19/01 05/19/01 EPA 8260B Methyl tert-butyl ether ND 200 It It It It " Dt-isopropyl ether ND 200 " Ethyl tent-butyl ether ND 200 Tert-amyl methyl ether ND 200 Surrogate 1,2-Dtchloroethane-d4 860% 76-114 41111111quoia Analytical-San Carlos The results in this report apply to the samples analyzed to accordance with the chain of custody document This analytical report must be reproduced in its entirety Page 18 of 33