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----------------- <br /> Road <br /> Sequoia an CarAIndustrial4070 <br /> r���"'"' >•` w`r` J'r San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical ww.seqAX oialab9612 <br /> w��nr+sequoialabs,cam <br /> Gettler-Ryan/Geostrategies(1) Project: Tosco(1) <br /> Project Number: UNOCAL SS4 11195,LATHROP,CA Reported: <br /> 6747 Sierra Court,Suite) j P <br /> Dublin CA,94568 Project Manager: Deanna Harding 08/28/01 07:22 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Metbod 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 /> Batch 1080068-EPA 5030E IP/Tl <br /> Blank(1080068-BLK2) Prepared&Analyzed:08/16/01 <br /> Ethanol ND 1000 ugll <br /> 1,2-Dibromoethane ND 2.0 " <br /> 1,2-Dichloroethane ND 2.0 " <br /> Di-isopropyl ether ND 2.0 " <br /> Ethyl tert-butyl ether ND 2.0 " <br /> Methyl tert-butyl ether ND 2.0 " <br /> Tert-amyl methyl ether ND 2.0 " <br /> Ten-butyl alcohol ND 100 " <br /> Surrogate:1,2-Dichloroelhane-d4 49.7 50.0 98.4 76-114 <br /> Surrogate:Toluene-d8 53.4 50.0 107 88-110 <br /> Blank(1080068-BLK3) Prepared&Analyzed:08/17/01 <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 Cert-butyl ether ND 2.0 " <br /> Methyl teri-butyl ether ND 2.0 " <br /> Teri-amyl methyl ether ND 2.0 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate:l,1-Dichloroelhane-d4 43.2 50.0 86.4 76-114 <br /> Surrogate:Toluene-d8 52.7 50.0 105 88-110 <br /> LCS(1080068-BSI) Prepared&Analyzed:08/15/01 <br /> Methyl lert-butyi ether 49.5 2.0 ug/l 50.0 99.0 70-130 <br /> Surrogate:1,1-Dichloroelhane-d4 51.3 50.0 103 76-114 <br /> Surrogate:Toluene-d8 53.2 50.0 106 88-110 <br /> Sequoia Analytical - San Carlos The results in chis report apply to the samples analyzed in accordance wish the chain oJ i, j <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page 20 of 22 <br />