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1551 indusinal Road <br /> Sequoia San Carlos 0 <br /> 23 <br /> (650)232-961)-9600 <br /> FAX(650)232-9612 <br /> 440 Analytical www sequoialabs com <br /> ler-Ryan/G eostrategies(I) Project Unocai(4) <br /> 6747 Sierra Court,Suite J Project Number Unocal SS115098 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 /> Analvte Result Limn Units Dilution Baich Prepared Analvzed Method Notes <br /> ]%1W-23S(1.,)12030-29)Water Sampled 12/04/01 10 42 Received 12/04/01 17 50 _ <br /> 1 2-Dibromoelhane(EDB) ND 1 0 ugA 1 1120032 12107/0] 12/07/01 EPA 8260B <br /> 12-Dichioroethane ND 10 " <br /> Benzene ND 10 <br /> Toluene ND 10 <br /> Ethylbenzene ND 1 0 <br /> Xylenes(total) ND 1 0 <br /> Methyl tert-butyl ether ND 10 <br /> Di-isopropyl ether ND 10 <br /> Teri-butyl alcohol ND 20 <br /> Ethvl ten-butvi ether ND 1 0 " <br /> Teri-amvl methvi ether ND 1 0 <br /> Surrogate 1,2-Dichloroethane-d4 103% 70-130 " <br /> Surrogate Toluene-d8 105 % 70-130 " <br /> Surrogate 4-BFB 892 % 70-130 " <br /> 23D(L112030-30 Water Sam led 12/04/0) 11 46 Received 12/04/01 17 50 <br /> - Ibromoethane(EDB) ND 10 ag/l 1 1120032 12107/01 12/07101 EPA 8260B <br /> 1,2-Dichioroethane ND 10 <br /> Benzene ND 10 " <br /> Toluene ND 10 <br /> Ethylbenzene ND 1 0 <br /> Xylenes(total) ND 10 <br /> Methyl tert-bury]ether ND 10 <br /> Di-isopropyl ether ND 10 <br /> Tert-butyl alcohol ND 20 <br /> Ethyl tert-butyl ether ND 10 <br /> Teri-amyl methyl ether ND 10 " <br /> Surrogate 1,2-Dichloroelhane-d4 108% 70-130 <br /> Surrogate Toluene-d8 10.3% 70-130 <br /> Surrogate 4-BFB 101 % 70-130 " <br /> I <br /> Mom Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the charas of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 23 of 34 <br />