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T ad Sequoia o n irlosC alR 70 San Carlos CA 94070 (650)232-9600 1 iW Analytical , wsequo;aiabsc6oin *r-Ryan/Geostrategics(l) Project Tosco(l) Sierra Court,Suite J Project Number Tosco(Unocal)SS#6981,Stockton,CA Reported Dublin CA,94568 Project Manager Deanna Harding 12/27/01 09 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-2(L)12085-14)Water Sampled 12/13/01 11 40 Received 12/13/01 19 40 Ethanol ND 500 uSA 1 1120086 12/21/01 12/21/01 EPA 8260B 1,2-Dibromoethane ND 10 1,2-Dichloroethane ND 10 Di-isopropyl ether ND 10 Ethyl tert-butyl ether ND 10 " Methyl tert-butyl ether 94 10 Tert-amyl methyl ether ND 10 " Tert-butyl alcohol ND 20 Surrogate 1,2-Dichloroethane-d4 914% 70-130 " Surrogate Toluene-d8 990% 70-130 " l%IW-7(L112085-15)Witter Sampled 12/13/010955 Received 12/13/01 19 40 Ethanol ND 500 ugA 1 1120078 1212010) 12/20/01 EPA 8260B 1,2-Dibromoethane ND 10 " 1,2-Dichloroethane 16 10 D ropyl ether ND 10 EWert-butyl ether ND 10 " Methyl tent-butyl ether 190 10 " " " " Teri-amyl methyl ether ND 10 Tert-butyl alcohol ND 20 " Surrogate 1,2-Dichloroethane-d4 832% 70-130 " Surrogate Toluene-d8 968% 70-130 " VW-4(L)12085-16)Water Sampled 12/13/01 12 10 Received 12/13/01 19 40 Ethanol ND 1000 Usti 2 1120078 12/20/01 12/20/01 EPA 8260B 1,2-Dibromoethane ND 20 " 1,2-Dichloroethane ND 20 Di-isopropyl ether ND 20 " Ethyl tert-butyl ether ND 20 Methyl tert-buts!ether 270 2 0 Tert-amyl methyl ether ND 20 Tert-butyl alcohol ND 40 " Surrogate 1,2-Dichloroethane-d4 826% 70-130 Surrogate Toluene-d8 102% 70-130 The results in this report apply to the samples analyzed in accordance with the chain o S a Analytical -San Carlos p ppy p !.n j custody document This analytical report must be reproduced in its entirety Page 12 of 22 I