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{ • 1551 Industrial Road <br /> 4—: Sequoia San Carlos CA 94070 <br /> (650)232-9600 <br /> TOWAnalytical FAX(650)2329612 <br /> • www sequoialabs com <br /> ttler-Ryan/Geostrategies(I) Project Tosco(1) <br /> 7 Sierra Court,Suite J Project Number Tosco#01205(Circle K),Lathrop,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 02/14/02 12 09 <br /> Volatile Organic S 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 2020001 -EPA 5030B IP/T] <br /> Blank(2020001-BLKI) Prepared&Analyzed 02/01/02 <br /> Ethanol ND 500 ug/l <br /> 1,2-Dibromoethane ND 10 " <br /> 1,2-Dichloroethane ND 10 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 1 0 " <br /> Tert-amyl methyl ether ND 1 0 " <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate 1 2-Dichloroeihane-d4 488 500 976 70-130 <br /> Surrogate Toluene-d8 496 500 992 70-130 <br /> LCS(2020001-BSI) Prepared&Analyzed 02/01/02 <br /> Methyl tert-butyl ether 486 10 ug/l 500 972 70-130 <br /> ate 12-Dtchloroethane-d4 486 500 972 70-130 <br /> gale Toluene-d8 466 500 932 70-130 <br /> Matrix Spike(2020001-MS1) Source,L201118-08 Prepared&Analyzed 02/01/02 <br /> Methyl tert-butyl ether 466 1 0 ug/l 500 ND 932 60-140 <br /> Surrogate 1 2-Drchloroelhane-d4 499 500 998 70-130 <br /> Surrogate Toluene-d8 471 500 942 70-130 <br /> Matrix Spike Dup(2020001-MSDI) Source L201118-08 Prepared&Analyzed 02/01/02 <br /> Methyl tert-butyl ether 506 10 ug/l 500 ND 101 60-140 823 25 <br /> Surrogate 1 2-Dtchloroethane-d4 501 500 100 70-130 <br /> Sun ogate Toluene-d8 474 500 948 70-130 <br /> *ia Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical i eport must be reproduced in its entirety <br /> Page 10 of l l <br />