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t - Gettler-Ryan/Geostrategies(1) Project Unocal(4) 6747 Sierra Court,Suite J Project Number Former Unocal SS#0187 Reported Dublin CA,94568 Protect Manager Deanna Harding 05/30/01 13 32 Volatile Organic Oxygenated Compounds by EPA Method 8260B Sequoia Analytical - San Carlos Reporting Analyte Result lMut Units Dilution Batch Prepared Analyzed Method Notes U-13(L105144-14)Water Sampled 05/15/0118.30 Received 05/16/0119.45 Tert-butyl alcohol ND 100 ug/l l 1050081 05/18/01 05/18/01 EPA 8260B Methyl tert-butyl ether ND 200 Di-isopropyl ether ND 200 Ethyl tert-butyl ether ND 200 Tert-amyl methyl ether ND 200 " Surrogate 1,2-Dichloroethane-d4 1 888% 76-114 " 1V-14(L105144-15)Water Sampled-05/14/0112 52 Received 05/16/0119:45 Tert-butyl alcohol ND 100 ug/1 1 1050081 05/18/01 05/18/01 EPA 8260B Methyl tert-butyl ether - ND 200 _ Di-isopropyl ether ND 200 Ethyl tent-butyl ether ND 200 ^ " Tert-amyl methyl ether - - - ND 200- -Surrogate 00`-Surrogate-1,2-Dichloroethane-d4 - - 906%-- 76-114_ _ U-15(L105144-16)Water Sampled 05/14/0113-45 Received 05/16/01 19.45 Tert-butyl alcohol ND 100 ug/1 1 1050081 05/18/01 05/18/01 EPA 8260B Methyl tert-butyl ether ND 200 " ---=-Di-isopropyl ether -- =ND 2 00- Ethyl tert-butyl ether ND 200 - - Tert-amyl methyl ether --- ------ - = -=ND-=- - 2 00-=--- "-- Surrogate 1,2-Dichloroethane-d4 942% 76-114 U-16(L105144-17)Water Sampled 05/14/0114-33 Received:05/1610119:45 Tert-butyl alcohol ND 100 ug/l 1 1050084 05/19/01 05/19/01 EPA 8260E Methyl tert-butyl ether ND 200 " Eh-isopropyl ether ND 200 „ Ethyl tert-butyl ether ND 200 " Tert-amyl methyl ether ND 200 Surrogate 1,2-Dichloroethane-d4 898% 76-114 r Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed to accordance with the ch custody document This analytical report must be reproduced in its entirety Page 17 of 33