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1551 Industrial Road <br /> Sequoia a San Carlos CA 94070 <br /> IAnalytical (650)232-9600 <br /> FAX(650)232-9612 <br /> www sequoialabs corn <br /> ler-Ryan/Geostrategles(1) Project Tosco(1) <br /> Sierra Court, Suite] Project Number Tosco(Unocal)SS#6981,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/07/02 12 56 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1 (L203104-02)Water Sampled 03/21/02 1015 Received 03/21/02 18 40 <br /> Ethanol ND 500 ug/l 1 2030068 03/25/02 03/25/02 EPA 8260B <br /> 1,2-Dibromoethane ND 2 0 " <br /> 1,2-Dichloroethane ND 20 <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tett-butyl ether ND 2 0 " <br /> Methyl tert-butyl ether ND 20 <br /> Ten-amyl methyl ether ND 2 0 <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1,2-Dtchloroethane-d4 118% 70-130 <br /> Surrogate Toluene-d8 103% 70-130 " <br /> _MW-2 L203104-03)Water Sampled 03/21/02 11 15 Received 03/21/02 18 40 _ <br /> Ethanol ND 500 ug/l 1 2030068 03/25/02 03/25/02 EPA 8260B <br /> 1,2-Dibromoethane ND 2 0 <br /> 1,2-Dichloroethane ND 20 <br /> propyl ether ND 2 0 ;; <br /> qw ert-butyl ether ND 2 0 " <br /> Methyl tert-butyl ether 78 20 ^ <br /> Tert-amyl methyl ether ND 2 0 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1,2-Dtchloroethane-d4 119% 70-130 " <br /> Surrogate Toluene-d8 103% 70-130 ^ <br /> MW-4 L203104-04 Water Sampled 03/20/02 16 08 Received 03/21/02 18-40 <br /> Ethanol ND 500 ug/1 1 2030068 03/25/02 03/25/02 EPA 8260E <br /> 1,2-Dibromoethane ND 20 <br /> 1,2-Dichloroethane ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Tert-amyl methyl ether ND 2 0 " <br /> Tert-butyl alcohol ND 100 ^ <br /> Surrogate 1,2-Dichloroethane-d4 125% 70-130 ^ <br /> Surrogate Toluene-d8 105% 70-130 " <br /> is Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 8 of 20 <br /> i <br />