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Gettler-Ryan/Geostrategtes(1) Project Unocal(4) ted 6747 Sierra Court,Suite J Project Number Former Unocal SS#0187pO1 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 Unut Units Dilution Batch Preparod Analyzed Method Notes U-9(L105144-10)Water Sampled 05/15/0112 25 Received: 05116/0119.45 Tert-butyl alcohol ND 100 ug/1 1 1050081 05/18/01 05/18101 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 884% 76-114 " U-10(L105144-11)Water Sampled 0511510115 45 Received 05/1610119 45 Tert-butyl alcohol ND 100 ugll 1 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 -amyl methyl ether ND 200 " gate 1,2 Dichloroethane-d4 902% 76-114 " U-11 (L105144-12)Water Sampled 05/15/0113 02 Received 05/16/0119 45 Tert-butyl alcohol ND 100 ug/l 1 1050081 05/18/01 05/18/01 EPA 8260E Methyl tett-butyl ether ND 200 Di-isopropyl ether ND 200 Ethyl tert-butyl ether ND 200 K " Tert-amyl methyl ether ND 200 n " Surrogate 1,2-Dichloroethane-d4 894% 76-114 U-12(1..105144-13)Water Sampled 05/15/0116 40 Received 05/1610119.45 Tert-butyl alcohol ND 100 ugll 1 1050081 05/18/01 05/18/01 EPA 8260B Methyl tent-butyl ether ND 200 " It " Di-isopropyl ether 228 200 It It " Ethyl tent-butyl ether ND 200 Tert-amyl methyl ether ND 200 " Surrogate 1,2-Dichloroethane-0 890% 76-114 " Ah C]uola Analytical- San Carlos Tice results to this report apply to the samples analyzed in accordance with the chain of custody document Thu analytical report must be reproduced in its entirety Page 16 of 33