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Indu <br /> Sequoia San an arlos5 na,Road <br /> Clos CA 941170 <br /> (650)232-961 <br /> qwr Analytical <br /> FAX(550)232-9612 <br /> www.scgtioialabs.com <br /> Gettler-Ryan/Geostrateg,ies(1) Project: Tosco(1) <br /> 6747 Sierra Court,Suite J Project Number: UNOCAL SS411195:LATHROP.CA Reported: <' <br /> Dublin CA,94568 Project Manager: Deanna Harding 08/28/01 07:22 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Balch 1080067-EPA 50308 IPITI <br /> Blank(1080067-BLKI) Prepared&Analyzed:08/15/01 <br /> Ethanol ND 1000 ugn <br /> 1,2-Dibromoethane ND 2.0 " <br /> 1,2-Dichloroelhane ND 2.0 " <br /> Di-isopropyl ether ND 2.0 " <br /> Ethyl Cert-butyl ether ND 2.0 " <br /> Methyl terl-butyl ether ND 2.0 " <br /> Ten-amyl methyl ether ND 2.0 " <br /> Teri-butyl alcohol ND 100 " <br /> Surrogate: l,2-Dichloroelhane-d4 55.2 50.0 110 76-114 <br /> Surrogate: Toluene-d8 54.0 50.0 108 88.110 <br /> Blank(1080067-BLK2) Prepared&Analyzed:08/17/01 <br /> Ethanol ND 1000 ug/l <br /> 1,2-Dibromoethane ND 2.0 <br /> 1,2-Dichloroelhane ND 2.0 <br /> Di-isopropyl ether ND 2.0 " <br /> Ethyl tert-butyl ether ND 2.0 <br /> Methyl Cert-butyl ether ND 2.0 " <br /> Tett-amyl methyl ether ND 2.0 " <br /> Teri-butyl alcohol ND 100 " <br /> .Surrogate.1,2-Dichloroethane-d4 48.4 50.0 96.8 76-114 <br /> Surrogate:Toluene-d8 50.3 50.0 101 88-110 <br /> LCS(1080067-BSI) Prepared&Analyzed:08/15/01 <br /> Methyl terl-butyl ether 44.6 2.0 ugll 50,0 89.2 70-130 <br /> Surrogate:1,2-Dichloroethane-d4 51.8 50.0 104 76-114 <br /> Surrogate: Toluene-d8 48.2 50.0 96.4 88-110 <br /> Sequoia Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chain of,"'- <br /> custody <br /> f`-custody document. This analytical report trust be reproduced in its entirety, <br /> Page 18 of 22 <br />