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1551 lndusinal Raad <br /> Sequoia San Carlos A94070 <br /> (650) <br /> rasa)232-9600 <br /> FAX(650)232-9613 <br /> Analytical www sequoislabs torn <br /> ter-Ryan/Geostrategies(1) Project Unoca)(4) <br /> 6747 Sierra Court.Suite J Prosect Number Unocal SS-45098 Stockton CA Reported <br /> Dublin CA 94568 Protect Manager Deanna Harding 01/01/02 11 05 <br /> Volatile Organic Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limn Umtc Level Result %REC Limits RPD Lima Notes <br /> Batch 1120006-EPA 50308 PIT <br /> Blank(1120006-BLKI) Prepared&Analyzed 12/04/01 <br /> 1 2-Dibromoethane(EDB) ND 10 ugA <br /> 12-Dichloroethane ND 10 <br /> Benzene ND 10 ' <br /> Toluene ND 10 " <br /> Ethvlbenzene ND 10 <br /> Xvlenes(total) ND 1 0 <br /> Ethanol ND $00 <br /> Meihvl tert-butyl ether ND 1 0 " <br /> Di-isopropyl ether ND 10 <br /> Ten-butvl alcohol ND 20 <br /> Ethyl tert-butyl ether ND 10 " <br /> 7 en-amyl methyl ether ND 1 0 " <br /> Vgate 1,2-Dichloroethone-d4 23 2 25 0 928 70-130 <br /> ogate Tohiene48 242 25 0 .968 70-130 <br /> Surrogate 4-BFB 23 4 250 93 6 70-130 <br /> Blank(1120006-BLK2) Prepared&Analyzed 12/06/01 <br /> 1 2-Dibromoethane(EDB) ND 10 ugA <br /> 12-Dichloroethane ND 10 " <br /> Benzene ND 10 " <br /> Toluene ND 10 " <br /> Ethylbenzene ND 1 0 " <br /> Xvlenes(total) ND 1 0 " <br /> Ethanol ND 500 " <br /> Methyl ten-butyl ether ND 1 0 " <br /> Di-isopropyl ether ND 1 0 " <br /> Teri-butyl alcohol ND 20 " <br /> Ethyl ten-butyl ether ND 1 0 " <br /> Ten-amyl methyl ether AID 1 0 " <br /> G�rrnoonia 1,2-Dichlarewhane-d4 244 " 250 976 70-130 <br /> Surrogate Toluene-d8 246 250 98 4 70-130 <br /> Surrogate 4-BFB 241 250 964 70-130 <br /> AIML <br /> oia Analytical-San Carlos The results in this report apply to the samples anal}zed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 29 of 34 <br />