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1551 Industrial Road <br /> ` Sequoia San Carlos 94070 <br /> (6650)50)232 9600 <br /> Analytical FAX(650)232-9612 <br /> www sequoialabs com <br /> 0/ er-Ryan/Geostrategies(l) Project Tosco(1) <br /> Sierra Court,Suite 3 Project Number Tosco#01205(Circle K),Lathrop Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/13/02 09 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/Tl <br /> LCS(2050005-BS2) Prepared& Analyzed 05/06/02 <br /> Methyl Cert-butyl ether 539 20 ug/1 500 108 70-130 <br /> Surrogate 1 2-Dichloroethane-d4 512 500 104 70-130 <br /> Surrogate Toluene-d8 510 500 102 70-130 <br /> Matrix Spike(2050005-MSI) Source L204096-07 Prepared&Analyzed 05/03/02 <br /> Methyl tert-butyl ether 523 20 ug/l Soo 65 9) 6 60-140 <br /> Surrogate 1 2-Dichloroethane-d4 502 500 100 70-130 <br /> Surrogate Toluene-d8 490 500 980 70-130 <br /> Matrix Spike Dup(2050005-MSD]) Source L204096-07 Prepared&Analyzed 05/03/02 ^_T <br /> Methyl tert-butyl ether 489 T 20 ug/l 500 65 848 60-140 672 25 <br /> Surrogate 1 2-Dichloroethane-d4 501 500 100 70-130 <br /> Surrogate Toluene-d8 498 300 996 70-130 <br /> 2050009-EPA 5030B JP/TJ <br /> Blank(2050009-BLKI) Prepared&Analyzed 05/06/02 <br /> Ethanol ND 500 ug/l <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 /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1 1-Dichloroethane-d4 509 500 102 70-130 <br /> Surrogate Toluene-d8 494 500 988 70-130 <br /> So a 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 12 of 14 <br />