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i Gettler-Ryan/Geostrategies(1) Project Unocal(4) 6747 Sierra Court,Suite] Project 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 Batcb Prepared Analyzed Method Notes U-1(L105144-02)Water Sampled 05/16/0116-20 Received: 05/16/0119-45 Tert-butyl alcohol ND 100 ug/1 1 1050076 05/18/01 05/18/01 EPA 8260B Methyl tert-butyl ether ND 200 Di-isopropyl ether ND 200 " Ethyl tett-butyl ether ND 200 H " Tert-amyl methyl ether ND 200 " " " " " " Surrogate 1,2-Dichloroethane-d4 932% 76-114 " U-2(L105144-03)Water Sampled 05/16/0115 45 Received:05/16/0119.45 Tert-butyl alcohol ND 100 119/1 1 1050076 05/18/01 05/18/01 EPA 8260B Methyl tent-butyl ether ND 200 " Di-isopropyl ether ND 200 " Ethyl tert-butyl ether ND 200 " Tert-amyl methyl ether ND gate 1,2-Dichloroethane-d4 854% 76-114 " U-3(L105144-04)Water Sampled 05/16/0115 10 Received:05116/0119-45 Tert-butyl alcohol ND 100 ug/l 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 42-Dichloroethane-d4 864% 76-114 U-4(L105144-05)Water Sampled 05/15/0110 12 Received:05/16/0119.45 Tert-butyl alcohol ND 100 uO 1 1050081 05/I8/01 05/18/01 EPA 8260B Methyl tett-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-& 876% 76-114 AdIhL uoia Analytical-San Carlos the results to this report apply to the samples analyzed in accordance with the chain of custody document This analytical report must be reproduced to its entirety Page 14 of 33