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Sequoia Walnut Crreek,CA 9 598 <br /> (925)988-9600 <br /> ,!T� Analytical FAX(925)988-9673 <br /> Aer Ryan,Inc -Dubhn Project Tosco <br /> 6747 Sierra Court Suite 3 Project Number Tosco(Unocal)4 6981 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 23-Nov-99 16 42 <br /> Volatile Organic Compounds by EPA Method 8260A <br /> Sequoia Analytical -Walnut Creek <br /> Reporting <br /> Analyte Result Lunt Umts Dilution Batch Prepared Analyzed Method Notes <br /> MW-1 (W910568-02)Water Sampled 26-Oct-99 09 55 Received 27-Oct-99 13 50 <br /> tert-Butyl alcohol ND 100 ug/l 1 9KO8019 04-Nov-99 04-Nov-99 EPA 8260A <br /> Methyl tert-butyl ether 38 20 <br /> Di-isopropyl ether ND 20 Po <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluorotnetliane 110% 50-150 " <br /> Surrogate 1,2-Dichloroethaite-d4 112% 50-150 " <br /> MW-2(W910568-03)Water Sampled 26-Oct-99 17 40 Received 27-Oct-99 13 50 <br /> tent-Butyl alcohol ND 500 ug/l 5 9KO8019 04-Nov-99 06-Nov-99 EPA 8260A <br /> Methyl tert-butyl ether 200 10 " <br /> Di-isopropyl ether ND 10 " <br /> LIM tent-butyl ether ND 10 " <br /> tett-Amyl methyl ether ND 10 " <br /> St to Dihromofluoromethane 104 % 50-150 " <br /> Stu ate 12-Dichlotoethane-44 102% 50-150 " <br /> MW-4(W910568-04)Water Sampled 26-Oct-99 11 35 Received 27-Oct-99 13 50 <br /> tent-Butyl alcohol ND 100 ug/l 1 91108019 04-Nov 99 06-Nov-99 EPA 8260A <br /> Methyl tert-butyl ether 33 20 " <br /> Di-isopropvl ether ND 20 " <br /> Ethvl tert-butyl ether ND 20 " <br /> test-Amyl methyl ether ND 20 " <br /> Swicigate Dihtuniufluuiumethane 104% 50-150 " <br /> Siarogate 1 2-Dichloiuethane-l-1 100 % 50-150 " <br /> SIV Analytical- Walnut Creek The resully in firs report apply to the samples a nalysed t n accordance wuh rhe charn of <br /> custody document This analytical report must be reproduced in its enirmy <br /> *ue g ey, olect ana er Page 8 of 19 <br />