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Sequoia 1551 Industrial Road An aly tical San Carlos CA 99600 7 FAX(650)232 96012 ti WWW sequoialabs comp Gettler-Ryan/Geostratei?ies(I) Project Tosco(1) :15:6747 Sierra Court,Suite J Project Number Unocal SS#08671,Stockton,CA Reported Dublin CA,94568 Project Manager Deanna Harding 02/28/02 11 N701atile Organic 8 QXygenated Compounds by EPA Method 8260B Sequoia Analytical - San Carlos Reporting - - Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-4 (L202080.05)Water Sampled, 02/12/02 18 00 Received 02/13/92,07 35 - Ethanol ND - _ 2500 ug/l 5 2020067 02/21/02 02/21/02 r EPA 8260] 1,2-Dibromoethane ND 10 1,2=Dichloroethane ND-1 0 " --- — — - Di-isopropyl ether ND 10 " Ethyl tert-butyl ether ND 10 Methyl tert-butyl ether 910 10 , Tert-amyl methyl ether ND 10 " Tert-butyl alcohol ND 500 Surrogate 1,2-Dichloroethane-d4 109% 70-130 " Surrogate Toluene-d8 980% 70-130 MW-5(L202080-06)Water Sampled 02/12/02 15 20 Received 02/13/02 07 35 r Ethanol ND 500 ugA 1 2020060 02/19/02 02/19/02 EPA 8260B . 1,2-Dibromoethane ND 20 1,2-Dichloroethane ' ND 20 Di-isopropyl ether ND 2 0 " " • Ethyl tert-butyl ether ND 20 Methyl tert-butyl ether ND 20 Tert-amyl methyl ether ND 20 " Tert-butyl alcohol ND-1 00 " Surrogate 12-Dichloroethane-d4 982% 70-130 " +' .Surrogate-Toluene-d8--_-- -- =107%— -=70430 -----"- MW-6 =70=130 -----"-MW-6(L202080-07)Water Sampled 02/12/02 15 55 Received 02/13/02 07 35 I✓thanol ND 500 ug/1 1 2020060 02/19/02 02/20/02 EPA 8260B 1,2-Dibromoethane ND 20 " " „ 1,2-Dichloroethane ND 20 Di-isopropyl ether ND 20 " Ethyl wt-bgtyl ether ND 20 Methyl tert-butyl ether ND 20 Tert-amyl methyl ether ND 20 Tert-butyl alcohol ND 100 " + Surrogate 1,2-Dichloroethane-d4 980% 70-130 Surroirate Toluene-d8 108% 70-130 Sequoia Analytical -San Carlos The results in this i epoit apply to the samples analyzed in accordance with the c of custody document This analytical t eport must be reproduced in its emir er Page 3 of 16