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Gettler-Ryan/Geostrategtes(1) Project Unocal(4) 6747 Sierra Court, Suite J Protect Number Former Unocal SS#0187 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 Limit Units Dilution Batch Prepared Analyzed Method Notes U-25(L105144-26)Water Sampled 05/14/01 17.07 Received: 05/16/0119 45 Tert-butyl alcohol ND 100 ug/1 1 1050085 05/21/01 05/21/01 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-Dtchloroethane-d4 936 % 76-114 NP-1-22(L105144-27)Water Sampled 05/16/0114.35 Received 05/16/01 19 45 Tert-butyl alcohol 676 200 ug/1 2 1050085 05/21/01 05/21/01 EPA 8260B Methyl tent-butyl ether 670 400 " Dr-isopropyl ether ND 400 Ethyl tert-butyl ether ND 400 " Tert-amyl methyl ether ND 400 " Owe 1,2-Dtchloroethane-d4 930 % 76-114 " NP-1-65(L105144-28)Water Sampled 05/1610114.05 Received-05/16/01 19 45 Tert-butyl alcohol ND 100 ug/1 1 1050085 05/21/01 05/21/01 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 1,2-Dtchloroethane-d4 102 % 76-114 NP-1-111(L105144-29)Water Sampled 05/16/0113 05 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 Di-isopropyl ether ND 200 Ethyl tent-butyl ether ND 200 " Tert-amyl methyl ether ND 200 Surrogate 1,2-Dtchloroethane-d4 106% 76-114 " AIIhL aia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain of custody document na analytical report must be reproduced in its entirety Page 20 of 33