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ti <br /> 1.551 Industnal Road <br /> 4D— Sequoia San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX(650)232-9612 <br /> www sequoialabs com <br /> ttler-Ryan/Geostrategies(1) Project Tosco(1) <br /> 7 Sierra Court,Suite J Project Number Unocal SS#08671 Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/21/02 13 26 <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 1,205023-02 Water Sampled 05/06/02 14 45 Received 05/06/02 17 05 <br /> Ethanol ND 12000 uSA 25 2050036 05/08/02 05/08/02 EPA 8260B <br /> 1,2-Dibromoethane ND 50 " <br /> 1,2-Dichloroethane ND 50 " <br /> Di-isopropyl ether ND 50 <br /> Ethyl tert-butyl ether ND 50 " <br /> Methyl tert-butyl ether 4400 50 <br /> Tert-amyl methyl ether ND 50 " <br /> Tert-butyl alcohol ND 2500 " <br /> Surrogate 1,2-Dichloroethane-d4 101% 70-130 " <br /> Surrogate Toluene-d8 102% 70-130 " <br /> MW-2 (L205023-03)Water_ Sampled 05/06/02 13 35 Received _05/06/02 17 05 <br /> Ethanol ND 500 ug/l - 1 2050016 05/08/02 05/08/02 EPA 8260B <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Dichloroethane ND 20 " <br /> J&opropyl ether ND 20 <br /> tert-butyl ether ND 20 " <br /> Methyl Cert-butyl ether 30 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 100 <br /> Surrogate 1,2-Dichloroethane-d4 105% 70-130 " <br /> Surrogate Toluene-d8 998% 70-130 " <br /> MW-3 (L205023-04)Water Sampled 05/06/02 13 05 Received 05/06/02 17 05 <br /> Ethanol ND 500 ug/I 1 2050016 05/08/02 05/08/02 EPA 8260B <br /> 1,2-Dibromoethane ND 20 " <br /> ],2-Dichloroethane ND 2 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether 21 20 " <br /> Teri-amyl methyl ether ND 2 " <br /> Tert-butyl alcohol ND 100 <br /> Surrogate 1,2-Dichloroethane-d4 105% 70-130 " <br /> Surrogate Toluene-d8 996% 70-130 " <br /> is Analytical -San Carlos The t esults 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 2 of 13 <br />