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Sequoia 1551 nal Road San Carlosrlos CA 9407D070 (650)232-9600 a- ) Analytical wFAX ww(650)232-9612 com Gettler-Ryan/Geostrategtes(I) Project Tosco(1) 6747 Sierra Court,Suite J Project Number Tosco(Unocal)SS#6981,Stockton Reported Dublin CA,94568 Project Manager Deanna Harding 05/07/02 12 56 _Volatile Organic 8 Oxygenated-Compounds by EPA Method 8260B - Sequoia Analytical - San Carlos _ Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Nates MW-14(L203104-11)Water Sampled 03/20/02 11 10 Received 03/21/02 18 40 Ethanol ND 500 ugfl 1 2030068 03/26/02 03/26/02 EPA 8260B 1,2-Dibromoet ane ND 2 0 1,2-Dichloroethane ND 2 0 " Di-isopropyl ether ND 20 " + Ethyl tent-butyl ether ND 2 0 " + Methyl tert-butyl ether 38 2 0 ^ Tert-amyl methyl ether ND 2 0 Tert-butyl alcohol ND 100 " + Surrogate 1,2-Dichloroethane-d4 104% 70-130 Surrogate Toluene-d8 970% 70-130 MW-15 L203104-12 Water Sampled 03/20/02 14 45 Received 03/21/02 18 40 Ethanol ND 500 ug/) 1 2030068 03/26/02 03/26/02 EPA 9260B 1,2-Dibromoethane ND 2 0 „ ^ 1,2-Arch oroet ane 6 l 2 0 + Di-isopropyl ether ND 2 0 Ethyl tert-butyl ether ND 2 0 ^ ^ Methyl tert-butyl ether 65 2 0 'Pert-amyl methyl ether ND 2 0 Tert-butyl alcohol ND 100 Surrogate 1,2-Dichloroethane-d4 107% 70-130 " ^ Surrogate Toluene-d8 984% 70-130 " MW-16(L203104-13)Water Sampled 03/20/02 12 00 Received 03/21/02 18 40 Ethanol ND 1200 ug/l 2 5 2030068 03/26/02 03/26/02 EPA 8260B T 1,2-Dibromoethane ND 5 0 " 1,2-Dichloroethane ND 5 0 Di-isopropyl ether ND 5 0 ^ " Ethyl tert-butyl ether ND 5 0 Methyl tert-butyl ether 230 5 0 Tert-amyl methyl ether ND 5 0 Tert-butyl alcohol ND 250 Surrogate 1,2-Dichloroethane-d4 107% 70-130 " Surrogate Toluene-d8 9.52% 70-130 " Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain o custody document This analytical report must be reproduced in its entirety Page 11 of 20