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1551 Industnal Road <br /> Sequoia San Carlos650)23 -9600 <br /> (650)232-9600 <br /> FAX(650)232-9612 <br /> Analytical .wvwscquoialabs com <br /> u <br /> ler-RyanlGeostratepies(1) Project Unocal(4) <br /> 6747 Sierra Court.Suite J Project Number Unocal SS##5098 Stockton CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 01/01/02 11 05 <br /> Volatile Organic Oxygenated Compounds by EPA Method 8260B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analyte Result limit Units Dilution Batch Prepared Analyzed Method Notes <br /> A9W-18ILI12030-21)Water Sampled 12/0310111 56 Received 1210410) 17 50 <br /> 1,2-Dibromoethane(EDB) ND 10 ugll 1 1120027 12/07/01 1210710) EPA 8260B <br /> 12-Dichloroethane ND 10 <br /> Benzene ND 10 <br /> Toluene ND 10 <br /> Ethvlbenzene ND 10 " <br /> Xylenes(total) ND 1 0 " <br /> Methyl tert-butyl ether ND 1 0 " <br /> Di-isopropyl ether ND 1 0 " <br /> Tert-butyl alcohol ND 20 <br /> Ethyl tent-butyl ether ND 10 " <br /> Tert-amyl methvl ether ND 10 " <br /> Surrogate 1,2-Dichloroethane-d4 110% 70-130 " <br /> Surrogate Toluene-d8 964% 70-130 " <br /> Surrogate 4-BFB 103% 70-130 " <br /> -18D L112030-22 Water Sampled 12/03/01 12 50 Received 12/04/01 17 50 <br /> -Dibromoethane(EDB) ND 10 ug/1 1 1120032 12/07/01 12/07/01 EPA 8260E <br /> 1,2-Dichloroethane ND 10 <br /> Benzene ND 10 " <br /> Toluene ND 10 " <br /> Ethylbenzene ND 10 <br /> Xylenes(total) ND 10 <br /> Methyl tert-butyl ether ND 10 <br /> Di-isopropyl ether ND 1 0 <br /> Teri-butyl alcohol ND 20 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Ten-amyl methyl ether ND 10 " <br /> Surrogate 1,2-Drchloroerhane-d4 108% 70-130 " <br /> Surrogate Toluene-d8 996% 70-130 " <br /> Surrogate 4-BFB 102% 70-130 " <br /> 41111111luoia Analytical- San Carlos The results in this report apply to the samples anolYed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 19 of 34 <br />