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Sequoia 404 N Lane Walnut GCA eek CA 94598 (925)98&9600 FAX(925)98&9673 Analytical www sequolalabis C.Om Gettler Ryan,Inc -Dublin Project Unocal 6747 Sierra Court Suite J Project Number Unocal#0187 Reported Dublin CA,94568 Project Manager Deanna L Harding 14-Mar--01 10 19 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical -Walnut Creek Reporting Analyte Result Lm ut Units Dilution Batch Prepared Analyzed Method Notes U-19(W102669-20)Water Sampled 27-Feb-01 14 00 Received 28-Feb-01 16 50 tert-Butyl alcohol ND 50 ugll I 1C07012 08-Mar-01 09-Mar-01 EPA 8260B Methyl tert-butyl ether ND 20 " Di-isopropyl ether 21 20 Ethyl tert butyl ether ND 20 ~ " tert Amyl methyl ether ND 20 " Surrogate Dibromofluoromethane 110% 50-150 Surrogate 1,2 Dtchloroethane-d4 896% 50-150 " U-20(WI02669-21)Water Sampled 26-Feb-01 15 02 Received 28-Feb-01 16 50 tert-Butyl alcohol ND 50 ug/l 1 IC07012 08-Mar-01 09-Mar-01 EPA 8260B Methyl tert-butyl ether ND 20 Di-isopropyl ether ND 20 " ^ Ethyl tert-butyl ether ND 20 " tert-Amyl methyl ether ND 20 " Surrogate Dibromofluoromethane- _ --- - - - 109% -50-150 Surrogate 1,2-Dichloroethane-d4 892% 50-150 " U-21 (W102669-22)Water Sampled 27-Feb-011459 Received 28-Feb-01 16 50 tert-Butyl alcohol ND 50 ug/1 I 1C07012 09-Mar-01 09-Mar-01 EPA 8260B Methyl tert-butyl ether = - -_ -=ND - 2 0 - Di-isopropyl ether 27 20 ~ ^ —Ethyl tert-butyl ether-- - ----- --ND---2 0---"�- - „ —" - ~- ----- ----" -- - tert-Amyl methyl ether ND 20 " ~ Surrogate Dibromofluoromethane 114% 50-150 " Surrogate 1,2-Dichloroethane-d4 912% 50-150 Sequoia Analytical-Walnut Creek The results in this reporl apply to the samples analyzed in accordance with the Chian custody document Tins analytical report must be reproduced to its enttret Page 9 of 32