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404 N Wiget Lane <br /> L Walnut Geek,CA 94598 <br /> Sequoia (925)988-9600 <br /> FAX{925}988-9673 <br /> Analytical www seq com <br /> 4W -- <br /> Gettler Ryan,Inc -Dublin Project Unocal <br /> 6747 Sierra Court Suite J Project Number Unocal 4 8671 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 14-Aug-00 07 49 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lmut Units Level Result %REC Limits RPD Limit Notes <br /> Batch OH09012-EPA 5030B [PIT] <br /> Blank(OH09012-BLK1) Prepared&Analyzed 09-Aug-00 <br /> ted-Butyl alcohol ND 100 urA <br /> Methyl Cert-butyl ether ND 20 " <br /> Di-isopropyl ether NO 20 , <br /> Ethyl teat-butyl ether ND 20 <br /> ted-Amyl methyl ether ND 20 • <br /> Surrogate Dibromofluoromethme S20 500 104 SO-150 <br /> Surrogate 12-Dichloroethane-d4 Soo 500 100 50-150 <br /> Blank(OH09012-BLK2) Prepared&Analyzed 11 Aug-00 <br /> tart-Butyl alcohol ND 100 ugA <br /> Methyl tert butyl ether ND 20 " <br /> fopropyl ether ND 20 <br /> ltert-butyl ether ND 20 <br /> tort-Amyl methyl other ND 20 " <br /> Surrogate Debromofluoromethane 510 Soo 104 50-150 <br /> Surrogate 1,1-DJchloroedume-d4 470 500 940 50-150 <br /> LCS(OH09012-BS1) Prepared&Analyzed 09-Aug-00 <br /> Methyl ted-butyl ether 475 20 ugll 500 950 70-130 <br /> Surrogate Dibromofluoromerhane 520 500 104 50.150 <br /> Surrogate 12-Dlchloroerhane-d4 490 " 500 980 50.150 <br /> LCS(OH09012-BS2) Prepared&Analyzed 11-Aug-00 <br /> Methyl ted-butyl ether 427 20 ugll 500 85 4 70-130 <br /> Surrogate Dlbromofluoromethane 510 500 104 50-150 <br /> Surrogate 11-Diehloroethane-d4 450 500 900 50-150 <br /> Matrix Spike(OH09012-MSI) Source W007560-04 Prepared&Analyzed 09-Aug-00 <br /> Methyl ted-butyl ether 489 20 1191150 0 ND 978 60 1 SO <br /> Surrogate Dibromofluoromethare 510 500 102 50.150 <br /> Surrogate 1 2 Dichloroethane-d4 490 500 9&0 50-150 <br /> Ola AIlalytlCal-Walnut Creels The results in this report apply to the samples analysed in accordance with the churn of <br /> custody document This analytical report must be reproduced in its entirely <br /> Page 7 of 9 <br />