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885 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> FAX(408)782-6308 <br /> Analytical ". Iuo�la�: i <br /> f <br /> Project: <br /> Gettler RyatilGeostrategies-Toscoli)nocal - <br /> CtSuite] Project Number: Unocal SS#08671 Reported: <br /> 6747 Sierra <br /> Dublin CA,Ct,Su Project Manager: Deanna Harding 06/12/01 18:10 <br /> 68 <br /> Volatile Organic Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit. Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1F06001 -EPA 5030B P/T <br /> Blank(1F06001-BLK1) Prepared&Analyzed:06/05/01 <br /> Ethanol ND 400 ug/I ' <br /> cert-Butyl alcohol ND 20.0 " <br /> Methyl ten-butyl ether ND 1.00 " <br /> i <br /> Di-isopropyl ether ND 1.00 " <br /> Ethyl tert-butyl ether ND 1.00 " <br /> tert-Amyl methyl ether ND 1.00 " <br /> 1,2-Dichloroethane ND 1.00 <br /> Ethylene dibromide ND 1.00 " <br /> Surrogate: 1,2-Dichloroethane-d4 10.3 10.0 103 70-130 <br /> Blank(1F06001-BLK2) Prepared&Analyzed:06/05/01 <br /> Ethanol ND 400 ug/1 <br /> tert-Butyl alcohol ND 20.0 " <br /> Methyl tert-butyl ether ND 1.00 " <br /> Di-isopropyl ether ND 1.00 " <br /> Ethyl tert-butyl ether ND 1.00 " <br /> tert-Amyl methyl ether ND 1.00 " <br /> 1,2-Dichloroethane ND 1.00 <br /> Ethylene dibromide ND 1.00 " <br /> Surrogate:1,2-Dichloroethane-d4 9.18 10.0 91.8 70-130 <br /> LCS(1F06001-BSI) Prepared&Analyzed:06/05/01 <br /> Methyl tert-butyl ether 8.92 1.00 ug/l 10.0 89.2 70-130 <br /> Surrogate:1,2-Dichloroethane-d4 9.70 10.0 97.0 70-130 <br /> LCS(11+06001-BS2) Prepared&Analyzed:06/05/01 <br /> Methyl tert-butyl ether 7.87 L00 ug/l 10.0 78.7 70-130 <br /> Surrogate:1,1-Dichloroethane-d4 9.53 10.0 95.3 70-130 <br /> Sequoia Analytical-Morgan Hill <br /> The results in this report apply to the samples analyzed in accordance with the char�.o <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page Page 8 of 10 <br />