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Road <br /> Sequoia 1551Carlos <br /> Industrial4070 <br /> San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX <br /> ww.seq 0)232A612 <br /> www.sequoialabs.com <br /> C �-Ryan/Geostrategies(]) Project: Tosco(1) <br /> 6747 Sierra Court,Suite J Projecl Number: UNOCAL SS411195,LATHROP,CA Reported: <br /> Dublin CA,94568 Project Manager: Deanna Harding 08/28/0107:22 <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 1080063- EPA 5030B JP/Tl <br /> Blank(1080063-BLKI) Prepared&Analyzed:08/15/01 <br /> Ethanol ND 1000 ug/i <br /> 1,2-Dibromoethane ND 2.0 " <br /> 1,2-Dichloroethane ND 2.0 <br /> Di-isopropyl ether ND 2,0 <br /> Ethyl ten-butyl ether ND 2.0 " <br /> Methyl tert-butyl ether ND 2.0 <br /> Teri-amyl methyl ether ND 2.0 " <br /> Teri-butyl alcohol ND 100 <br /> Surrogate:l,2-Dichloroethane-d4 52.6 50.0 105 76-114 <br /> Surrogate:Toluene-d8 52.2 50.0 104 88-110 <br /> Blank(1080063-BLK2) Prepared&Analyzed:08/15/01 <br /> Ethanol ND 1000 ug/l <br /> 1„# 6moelhane ND 2.0 " <br /> 1,2-Dichloroethane ND 2.0 <br /> Di-isopropyl ether ND 2.0 <br /> Ethyl tort-butyl ether ND 2.0 " <br /> Methyl tert-butyl ether ND 2.0 " <br /> Teri-amyl methyl ether ND 2.0 " <br /> Ten-butyl alcohol ND 100 " <br /> Surrogate:l,2-Dichloroethane-d4 55.2 50.0 110 76-114 <br /> Surrogate:Toluene-d8 54.0 50.0 108 88-110 <br /> Blank(1080063-BLK3) Prepared&Analyzed:08/17/01 <br /> Ethanol ND 1000 ugtl <br /> 1,2-Dibromoethane ND 2.0 " <br /> 1,2-Dichloroethane ND 2.0 " <br /> Di-isopropyl ether ND 2.0 " <br /> Ethyl teri-butyl ether ND 2.0 <br /> Methyl teri-butyl ether ND 2.0 " <br /> Tert-amyl methyl ether ND 2.0 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate:l,2-Dichloroethane-d4 48.4 50.0 96.8 76-114 <br /> Surrogate:Toluene-d8 50.3 50.0 101 88-110 <br /> Jia Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page 15 of 22 <br />