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404 N Wiget Lane <br /> i!DSequoia Walnut Creak,CA 94598 <br /> (925)Analytical <br /> FAX(916)988-96 <br /> ,W73 <br /> www se uoialahs cam <br /> ler Ryan,Inc -Dublin Project Unocal <br /> 6747 Sierra Court Suite J Project Number Unocal 4 2859 Reported- <br /> DubIm CA,94568 Project Manager Deanna L Harding 29-Apr-02 l 1 22 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Walnut Creek <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-20 244218-02)Water Sampled 11-Apr-021430 Received 12-Apr-02 15 00 <br /> Ethanol ND 500 ugn I 2D]6009 16-Apr-02 16-Apr-02 EPA 8260B <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether(MTBE) ND 20 <br /> Di-isopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 20 " <br /> tent-Amyl methyl ether ND 20 " <br /> 1,2-Dichloroethane ND 20 " <br /> Ethylene dibromide ND 20 " <br /> Surrogate Dtbromofluoromethane 94% 50-150 " <br /> Surrogate 1,2-Dichloroethane-d4 91 % 50-150 <br /> MW 21 (W204218-03)Water Sampled 11-Apr-02 15 20 Received 12-Apr-02 15 00 <br /> Ethanol ND 500 ugA I 2M6009 16-Apr-02 16-Apr-02 EPA 8260B <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether(MTBE) ND 20 <br /> opropyl ether <br /> ND 20 " <br /> OVI tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> 1,2-Dichloroethane ND 20 <br /> Ethylene dibromide ND 20 <br /> Surrogate Dibromofluoromethane 94% 50-150 " <br /> Surrogate 1,2-Dichloroethane-d4 90% 50-150 " <br /> nota Analytical-Walnut Creek The results in this repay t apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> 3 of 6 <br />