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1551 Industrial Road a— ) Sequoia San Carlos CA 94070 Analytical (650)232-9600 FAX(650om www scquoialabs ialahs com ler-RyanlGeostrategies(I Project Tosco(1) 7 Sierra Court, Suite J Project Number Tosco(Unocal)SS46981,Stockton,CA Reported Dublin CA,94568 Project Manager Deanna Harding 12127/0109 39 Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B Sequoia Analytical- San Carlos Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-4 (L112085-02)Water Sampled 12/12/01 17 45 Received 12/13/01 19 40 Ethanol ND 500 ug/l 1 1120086 I2121/01 12/21101 EPA 8260B 1,2-Dibromoethane ND l0 " 1,2-Dichloroethane ND 1 0 " " " " Di-isopropyl ether ND 10 " Ethyl tert-butyl ether ND 10 Methyl tert-butyl ether ND 10 Tert-amyl methyl ether ND 10 " Teri-butyl alcohol ND 20 Surrogate 1,2-Dichloroethane-d4 834% 70-130 " Surrogate Toluene-d8 102% 70-130 " MW-5(L112085-03 Water Sampled 12/12/01 15 45 Received 12/13/01 19 40 Ethanol ND 500 ugA 1 1120086 12/21/01 12/21/01 EPA 8260E 1,2-Dibromoethane ND 10 " ^ 1,2-Dichloroethane ND 1 0 opropyl ether ND 10 n 1 n n tert-butyl ether ND 10 " Methyl tert-butyl ether ND 10 Tert-amyl tnethyl ether ND 10 Tert-butyl alcohol ND 20 ^ Surrogate 1,2-Dichloroethane-d4 852% 70-130 " Surrogate Toluene-d8 101 % 70-130 " MW-6 W 12085-04)Water Sampled 12/12/01 13 30 Received 12/13/01 19 40 Ethanol - ND 500 ugA 1 1120086 12/21/01 12/21/01 EPA 8260E 1,2-Dibromoethane ND 10 ^ 1,2-Dichloroethane ND 10 ^ Di-isopropyl ether ND 10 ^ Ethyl tert-butyl ether ND 1 0 " Methyl Cert-butyl ether ND 10 " Teri-amyl metbyl ether ND 10 Tert-butyl alcohol ND 20 " ^ Surrogate 1,2-Dichloroethane-d4 856% 70-130 " Surrogate Toluene-d8 102% 70-130 " is Analytical-San Carlos The results in this report apply to the samples analysed in accordance ivith the chain of custody document This analytical report must be reproduced to its entirety Page 8 of 22