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Sequoia 404 N. , CA Lane <br /> Walnut Creels, CA 94598 <br /> (925)988-9600 <br /> Analytical <br /> FAX(925)988-9673 <br /> -.5 <br /> tettler Ryan,Inc.-Dublin Project: Unocal <br /> 6747 Sierra Court Suite J Project Number: Urtocal#11195 Reported: <br /> Dublin CA,94568 Project Manager: Deanna L.Harding 09-Dec-99 08:34 <br /> Volatile Organic Compounds by EPA Method 8260A <br /> Sequoia Analytical -Walnut Creep <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-9(W911580-08)Water Sampled: 19-Nov-99 10:16 Received: 22-Nov-99 16:00 <br /> lert-Butyl alcohol ND 100 ugll I 9LO1009 03-Dec-99 03-Dec-99 EPA 8260A <br /> Methyl tert-butyl ether 3.4 2.0 <br /> Di-isopropyl ether ND 2.0 <br /> Ethyl tert-butyl ether ND 2.0 <br /> tertAmyl methyl ether ND 2.0 <br /> Surrogate:Dibromofluoromethane 116% 50-150 <br /> Surrogate: 1,2-Dichloroethane-d4 106% 50-150 <br /> MW-10(W911580-09)Water Sampled: 19-Nov-99 09:42 Received: 22-Nov-99 16:00 <br /> tert-Butyl alcohol ND 20000 ugll 200 9LO1009 03-Dec-99 03-Dee-99 EPA 9260A <br /> Methyl tert-butyl ether 14000 400 " " " <br /> Di-isopropyl ether ND 400 <br /> Ethyl tert-butyl ether ND 400 <br /> tent-Amyl methyl ether ND 400 <br /> /F.-:rogate:Dibromofluorom ethane 116% 50-150 <br /> agate:1,2-Dichloroethane-d4 106% 50-150 " <br /> MW-11 (W911580-10)Water Sampled: 19-Nov-99 12:00 Received: 22-Nov-99 16:00 <br /> tert-Butyl alcohol ND 20000 ugh 200 9LO1009 03-Dec-99 03-Dec-99 EPA 8260A <br /> Methyl tert-butyl ether 20000 400 <br /> Di-isopropyl ether ND 400 " <br /> Ethyl tert-butyl ether ND 400 <br /> tert-Amyl methyl ether ND 400 <br /> Surrogate:Dibromofluoromethane 118% 50-150 <br /> Surrogate:l,2-Dichloroethane-d4 108% 50-150 <br /> S._eguoia Analytical-Walnut Creek The results in this report apply to the smnples analyzed i n accordance with thechain of <br /> custody document.This aralyfical report must be reproducedin its entirety. <br /> AlartB.Kemp, a orato Director Page 8 of 12 <br />