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404 N WWt Lane <br /> a— ) Sequoia Walnut Creek,CA 94596 <br /> (925)988-9600 <br /> Analytical FAX(916)988-9673 <br /> www se uoialabs conn <br /> er Ryan,Inc -Dublin Project Unocal <br /> Sierra Court Suite J Project Number Unocal#2859 Reported: <br /> Dubltn CA,94568 Project Manager Deanna L Harding 07-Dec-01 08 14 <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 /> MWA4(W111332-14)Water Sampled 17-Nov-01 10 00 Received 20-Nov-01 12 15 <br /> tert-Butyl alcohol ND 20 uSA 1 1K27026 27-Nov-01 27-Nov-01 EPA 8260E <br /> Methyl tert-butyl ether(MTBE) ND 20 " " ^ <br /> Di-isopropyl ether ND 20 " ^ " ^ <br /> Ethyl 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 Dibromo luoromethane 98% 50-150 <br /> Surrogate 1,2-Dichloroethane-d4 122 % 50-150 <br /> MW-15(W111332-15)Water Sampled 17-Nov-011230 Received 20-Nov-01 12 15 <br /> tert-Butyl alcohol ND �20 -ug/1 1 1K27026 27-Nov-01 27-Nov-01 EPA 8260B <br /> Methyl tert-butyl ether(MTBE) ND 20 <br /> Di-isopropyl ether ND 20 " ^ <br /> Ethyl tent-butyl ether ND 20 <br /> tyl methyl ether ND 20 <br /> chloroethane ND 20 " <br /> Ethylene dibromide ND 20 <br /> Surrogate DibromoJluoromethane 100% 50-150 <br /> Surrogate 1,2-Dichloroethane-d4 123% 50-150 <br /> MWA6(W111332-16)Water Sampled 17-Nov-01 10 55 Received 20-Nov-01 12 15 <br /> tert-Butyl alcohol ND 20 ugA 1 1K27026 27-Nov-01 27-Nov-01 EPA 82608 <br /> Methyl tert-butyl ether(MTBE) ND 20 " " ^ <br /> Di-isopropyl ether ND 20 " " ^ ° " ^ <br /> Ethyl tert-butyl ether ND 20 " It ^ <br /> tert-Amyl methyl ether ND 20 <br /> 1,2-Dichloroethane ND 20 <br /> Ethylene dibromide ND 20 <br /> Surrogate DibromoJluoromethane 98% 50-150 " <br /> Surrogate 1,2-Dichloroethane-d4 112% 50-150 " <br /> S40a Analytical -Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> 10 of 19 <br />