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1551 Industrial Road <br /> Sequoia Son Carlos CA 94070 <br /> (1) (650)232 9600 <br /> jiW Analytical -FAX(650)232-9612 -'- <br /> www sequoialabs corn <br /> Gettler-Ryan/Geostrategles(I) Protect Tosco(l) ' <br /> 6747 Sierra Court,Suite J Project Number Tosco#01205 (Circle K),Lathrop Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/13/02 0:26: <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 /> Batch 2050005- EPA 5030B IP/TI <br /> Blank(2050005-13LKI) Prepared& Analyzed 05/03/02 <br /> Ethanol ND 500 ug/l <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Dichloroethane ND 2 0 " <br /> Dr-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Ten-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1 2-Dichloroethane-d4 SO 1 500 100 70-130 <br /> Surrogate Toluene-d8 494 500 988 70-130 <br /> Blank(2050005-BLK2) -- _ Prepared& Analyzed 05/06/02 <br /> Ethanol ND 500 ug/I <br /> 1,2-Dibromoethane ND 20 <br /> 1,2-Dichloroethane ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> Tort-butyl alcohol ND 100 " <br /> Surrogate 12-Dichloroethane-d4 509 500 102 70-130 <br /> Surrogate Toluene-d8 494 500 988 70-130 <br /> LCS(2050005-BSI) Prepared& Analyzed 05/03/02 <br /> Methyl tert-butyl ether 456 20 ugll 500 912 70-130 <br /> Surrogate 12-Dichloroethane-d4 53 1 500 J06 70-130 <br /> Surrogate Toluene-d8 501 Soo 100 70-130 <br /> Sequoia Analytical - San Carlos The results in Mrs report apply to the samples analyzed in accordance with the chain <br /> custody document This analytrcal report must be reproduced to its entirety Ip <br /> Page 1 1 of 14 <br />