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1551 Indusinal Road <br /> Sequoia San Carlos 0 <br /> (b50)2323 2-960-9600 <br /> FAX(650)232-9612 <br /> Analytical www sNuoialabs com <br /> er-Ryart/Geostratepies(i Project Unocal(4) <br /> 7 Sierra Court-Suite 1 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 Metbod 8260B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analvie Result Limn Units Dilution Batch Prepared Analyzed Method Notes <br /> TB-LB(L112030-01)Water Sampled 12/03/01 00 00 Received 12/04/01 17 50 <br /> 1 2-Dtbromoethane(EDB) T ND 1 0 ug/l 1 1120006 12/06/01 12/06/01 EPA 8260B <br /> 12-Dtchloroethane ND 1 0 <br /> Benzene ND 10 <br /> Toluene ND 10 <br /> Ethvlbenzene ND 1 0 <br /> Xylenes(total) ND 1 0 <br /> Methvl tert-butyl ether ND 1 0 <br /> Di-isopropyl ether ND 1 0 <br /> Teri-butyl alcohol ND 20 <br /> Ethyl tert-butvl ether ND 1 0 <br /> Ten-amyl methvl ether ND 1 0 " <br /> Surrogate 1,2-Dtchloroethane-d4 113 % 70-130 " <br /> Surrogate Toluene-d8 992 % 70-130 " <br /> Surrogate 4-BFB 996% 70-130 " <br /> UNkI (L112030-02)Water Sam led 12/04/01 13 10 Received 12/04/01 17 50 <br /> Ibromoethane(EDB) ND 5 0 ugll 5 1120006 12/06/01 12/06/01 EPA 8260B <br /> 12-Dichioroethane ND 5 0 " <br /> Benzene 510 5 0 <br /> Toluene 57 5 0 " <br /> Ethylbenzene 62 5 0 <br /> Xylenes(total) 190 5 0 <br /> Methyl ten-butyl ether ND 5 0 <br /> Di-isopropyl ether ND 5 0 <br /> Ten-butyl alcohol ND 100 <br /> Ethyl tert-butyl ether ND 5 0 <br /> Ten-amyl methyl ether ND 5 0 <br /> Surrogate 1,2-Dtchloroethane-d4 115 % 70-130 " <br /> Surrogate Toluene-d8 105% 70-130 " <br /> Surrogate 4-BFB 104016 70-130 " <br /> la Analytical-San Carlos The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document This analytical report must be reproduced in its ennrety <br /> Page 9 of 34 <br />