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1551 Industnal Road <br /> Sequoia San Carlos CA 94070 <br /> 4D (650)232 9600 <br /> Analytical FAX(650)232-9612 <br /> www sequoialabs com <br /> Gettler-Ryan/Geostrategies(1) Project Tosco(I} <br /> 6747 Sierra Court,Suite J Project Number Tosco(Unocal)SS#6981,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/07/02 12 56 <br /> Volatile Organic S Oxygenated Compounds by EPA Method 82.60B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-5 (L203104-05)Water_ Sampled 03/20/02 15 10 Received 03/21/02 18 40 <br /> Ethanol ND 500 ug/) 1 2030068 03/25/02 03/25/02 EPA 8260B <br /> 1,2-Dibromoethane ND 2 0 <br /> I,2-Dichloroethane ND 2 0 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 2 0 <br /> Methyl tert-butyl ether ND 20 <br /> Tert-amyl methyl ether ND 20 <br /> Ter(-butyl alcohol ND 100 " <br /> .Surrogate 1,2-Dtchloroethane-d4 122% 70-130 <br /> Surrogate Toluene-d8 104% 70-130 <br /> MW-6(L203104-06)Water Sampled 03/20/02 12 45 Received 03/21/02 18 40 _ - <br /> Ethanol ND 500 ugA 1 2030068 03125/02 03/25/02 EPA 8260E <br /> 1,2-Dibromoethane ND 2 0 " " " 11 <br /> 1,2-Dichloroethane ND 2 0 <br /> Di-isopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 2 0 <br /> Methyl tert-butyl ether ND 2 0 " <br /> Tert-amyl methyl ether ND 2 0 " <br /> Tert-butyl alcohol ND 100 <br /> Surrogate 1,2-Dtchloroethane-d4 126% 70-130 <br /> Surrogate Toluene-d8 104% 70-130 <br /> MW-7 JL203104-07)Water Sampled 03/20/02 16„50„ Received 03/21/02 Is 40 <br /> Ethanol ND 500 ug/l 1 2030071 03/26/02 03/26/02 EPA 8260B <br /> 1,2-Dibromoethane ND 2 0 <br /> 1,2-Dtchloroethane ND 2 0 <br /> Dt-isopropyl ether ND 2 0 <br /> Ethyl tert-butyl ether ND 20 ” <br /> Methyl tert-butyl ether ND 2 0 <br /> Tert-amyl methyl ether ND 2 0 " <br /> Tert-butyl alcohol ND I00 " <br /> Surrogate 1,2-Dichloroethane-d4 102% 70-130 <br /> Surrogate Toluene-d8 966% 70-130 " <br /> Sequoia Analytical -San Carlos The results in this report apply to the samples analyzed to accordance with the churn <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 9 of 20 <br />