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u of a 1551 industnal Road S San Carlos 23 -96 0 (650}232-9600 � Analytical FAX wwsego)232A612 www sequoialahs com r-Ryan/Geostrategies(l) Project Tosco(1) Sierra Court,Suite 3 Project Number Tosco(Unocal)SS#6981,Stockton Reported Dublin CA,94568 Project Manager Deanna Harding 05/07/02 12 56 Volatile Organic S Oxygenated Compounds by EPA Method 8260B Sequoia Analytical - San Carlos Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-8(L203104-08)Water Sampled 03/20/02 13 25 Received 03/21/02 18 40 Ethanol ND 500 ug/I 1 2030068 03/25/02 03/25/02 EPA 8260B 1,2-Dibromoethane ND 2 0 " 1,2-Dichloroethane ND 2 0 " Di-isopropyl ether ND 20 Ethyl tert-butyl ether ND 2 0 " Methyl tert-butyl ether ND 2 0 " Tert-amyl methyl ether ND 2 0 " Tert-butyl alcohol ND 100 Surrogate 1,2-Dichloroethane-d4 124% 70-130 " Surrogate Toluene-d8 107% 70-130 " MW-9(L203104-09)Water Sampled 03/20/02 11 10 Received 03/21/02 18 40 Ethanol ND 500 ug/1 1 2030068 03/26/02 03126/02 EPA 8260E 1,2-Dibromoethane ND 2 0 1,2-Dichloroethane ND 2 0 " ropyl ether ND 2 0 ert-butyl ether ND 2 0 Methyl tent-butyl ether ND 2 0 " Tert-amyl methyl ether ND 2 0 " Tert-butyl alcohol ND 100 " Surrogate 1,2-Dichloroethane-d4 992% 70-130 " Surrogate Toluene-d8 982% 70-130 " MW 11 (L203104-10)Water Sampled 03/20/02 12 00 Received 03/21/02 18 40 Ethanol ND 500 ug/1 1 2030068 03/25/02 03/25/02 EPA 8260B 1,2-Dibromoethane ND 2 0 1. n 1. " I,2-Dichloroethane ND 2 0 " Di-isopropyl ether ND 2 0 " Ethyl tert-butyl ether ND 2 0 " Methyl tert-butyl ether ND 2 0 Tert-amyl methyl ether ND 2 0 " Tert-butyl alcohol ND 100 " Surrogate 1,2-Dichloroethane-d4 126% 70-130 " Surrogate Toluene-d8 106% 70-130 " ca Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain of custody document This analytical report must be reproduced in its entirety Page 10 of 20