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1551 Indusinal Road <br /> Sequoia San Carlos CA 94070 <br /> 4D (650)232-9600 <br /> FAX(650)232-9612 <br /> v4�► Analytical www sequoialabscorn <br /> ler-Ryan/Geostrategies(I) Project Unoca](4) <br /> 6747 Sierra Court.Suite J Project Number Unocal SS#5098 Stockton CA Reported <br /> Dubhn CA 94568 Project 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 /> [Analvic Result Limn Umt4 Level Result %REC Limits RPD Limit Notes <br /> Batch 1120027-EPA 50308 JPtTl <br /> Blank(1120027-BLKI) Prepared&Analyzed 12/07/01 <br /> 1 2-Dibromoethane(EDB) ND 10 ug/I <br /> 12-Dichloroethene ND 10 ' <br /> Benzene ND 10 ' <br /> Toluene ND 10 " <br /> Ethvlbenzene ND 10 <br /> Xylenes(total) ND 1 0 " <br /> Ethanol ND 500 " <br /> Methvl ten-butvi ether ND 1 0 " <br /> Di-isopropvl ether ND 10 " <br /> Tert-butyl alcohol ND 20 <br /> Ethyl Cert-butvl ether ND I 0 <br /> Teri-amyl methyl ether ND 10 " <br /> 0flare J 2-Drchloroeihane-d4 254 250 102 70-130 <br /> ognte Toluene-d8 244 250 9745 70-130 <br /> Surrogate 4-BFB 247 250 988 70-130 <br /> LCS(1120027-BSI) Prepared&Analyzed 12/07/01 <br /> Benzene 522 1 0 ugJl Soo 104 70-130 <br /> Toluene 497 1 0 500 994 70-130 <br /> Methyl Cert-butvi ether 492 10 " 300 984 70-130 <br /> Surrogate 12-Dichloroethone-d4 234 230 101 70-130 <br /> Surrogate Toluene-d8 246 15 0 984 70-130 <br /> Surrogate 4-BFB 233 15 0 101 70-130 <br /> _Matrix Spike(1120027-MSI) _ Source L112030-08 Prepared&Analyzed 12/07/01 <br /> Benzene 514 10 ug/I 500 ND 103 60-140 <br /> Toluene 493 10 " Soo ND 986 60-140 <br /> Methyl tert-butyl ether 463 1 0 .500 ND 926 60-140 <br /> Surrogate 12-Dichloroethane-d4 244 250 976 70-130 <br /> Surrogate Toluene-d8 2.59 250 104 70-130 <br /> 0 Moga,e 4-BFB 2-22 250 888 70-130 <br /> Amok <br /> Ola Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chain o/ <br /> custod),document This analytical report must be reproduced to its enarery <br /> Page 31 of 34 <br />