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1551 Industrial Road <br /> 4D Sequoia San Carlos CA 94070 <br /> ,� Analytical (650)232-9600 <br /> FAX(650)232 9612 <br /> www sequotalabs coin 7 <br /> Gettler-RyanlGeostrategies(1) Project Tosco(1) <br /> 6747 Sierra Court, Suite J Project Number Unocal SS#08671 Repd <br /> Dublin CA,94568 Project Manager Deanna Harding 05/21/02113 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-4(L-205023-05)Water Sampled 05/06/02 1.4 10 Received 05/06/02 17 05 _ <br /> Ethanol ND 3600 ug/1 7 14 2050016 05/08/02 05/08/02 EPA 8260B <br /> 1,2-Dibromoethane ND 14 <br /> 1,2-Dtchloroethane ND 14 <br /> Di-isopropyl ether ND 14 <br /> Ethyl tert-butyl ether ND 14 <br /> Methyl tert-butyl ether 1300 14 <br /> Tert-amyl methyl ether ND 14 <br /> Tert-butyl alcohol ND 710 <br /> Surrogate 1,2-Dichloroethane-d4 104% 70-130 " " <br /> Surrogate Toluene-d8 996% 70-130 " + <br /> MW-5(L205023-06)Water Sampled 05/06/0211-50 Received 05/06/02 17 05 _ <br /> Ethanol ND 500 ug/1 1 2050016 05/08/02 05/08/02 EPA 8260B <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 20 <br /> Tert-butyl alcohol ND 100 " <br />_Surrogate 1,2-Dtchloroethane-d4 107_% 70-130 <br /> Surrogate Toluene-d8 996% 70-130 <br />—MW-6(L205023-07)Water---Sampled 05/06/_02-12 30JReceived 05/06/02-17 05- <br /> Ethanol <br /> 5 Ethanol - ND 500 ug/1 1 2050016 05/08/02 05/08/0_2 EPA 82608 <br /> T1,2-Dibromoethane- _ - - --ND - <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 20 <br /> Tert-butyl alcohol ND 100 " + <br /> Surrogate 1,2-Dichloroethane-d4 107% 70-130 11 <br /> Surrogate Toluene-d8 988% 70-130 <br /> Sequoia Analytical -San Carlos The results in this i eport apply to the samples analyzed in accordance with the chain o <br /> custody document This analytical report must be reproduced to its entirety 49 <br /> Page 3 of 13 <br />