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1551 Indusinal Road <br /> Sequoia San Carlos 23 9600 <br /> D <br /> (650)232 9600 <br /> Analytical www <br /> seq(00)232-9612 <br /> 612 <br /> www sequoialabs com <br /> Genler-Ryan/G eostrate#tes(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 /> Analvie Result Limn Units Dilution Batch Prepared Analyzed Method Not <br /> AS-26(L112030-35)Water Sampled 12/04/01 11 10 Received 12/04/011750 1 <br />—1 2-Dibromoetbane(EDB)_-_____,___—ND 10=ug/I _ 1_ -1120032 12107101- 12/07/01 EPA_82608 ____ <br /> 12-Dichloroethane ND 10 <br /> Benzene ND 10 <br /> Toluene 2 0 1 0 <br /> Ethvibenzene 12 10 <br /> Xvlenes(total) 1 7 1 0 " <br /> Methvl tert-butyl ether ND 10 « " <br /> Di-isopropyl ether ND 1 0 <br /> Ten-butyl alcohol ND 20 <br /> Ethyl Cert-butyl ether ND 10 <br /> Ten-amvl methyl ether ND to " <br /> Surrogate 1,2-Dichloroethane-d4 - 118% 70-130 <br /> Surrogate Toluene-d8 102% 70-130 " <br /> Surrogate 4-BFB - 104% 70-130 <br /> NNW-27 L112030-36 Water Sampled 12/03/01 13 15 Received 12/04/01 17 50 <br /> 1 2-Dibromoethane(EDB) ND 10 upA 1 1120032 12/07/01 12/07/01 EPA 8260E <br /> 12-Dichloroethane ND 10 <br /> Benzene ND 10 <br /> Toluene ND 10 <br />= Ethvibenzene= ---- -_ -ND - --I 0- __- <br /> Xylenes(total) 15 10. <br /> Methyl tett-butyl ether- -=-`-ND - - 1 0_. - - -" -�--"-- - —" ---- -- - -- - -- ---- - - <br /> Di-isopropyl ether ND 10 <br /> Ten-butvl alcohol" T - - ND - -20 <br /> Ethyl tert-butyl ether ND 1 0 <br /> Teri-amyl methyl ether ND 1 0 " <br /> Surrogate 0-Dichloroethane-d4 107% 70-130 " <br /> Surrogate Toluene-d8 976% 70-130 " <br /> Surrogate 4-BFB 104% 70-130 " <br /> Sequoia Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced to its ennreq <br /> Page 26 of 34 <br />