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1551 Industrial Road <br /> KD <br /> Sequoia San Carlosrlos CA 94070 <br /> mw Analytical (650)232-9600 <br /> FAX(650)232-9612— <br /> www sequoialabs corn <br /> Gettler-Ryan/Geostrategies(1) Project Tosco(1) <br /> 6747 Sierra Court, Suite J Project Number Tosco#01205(Circle K),Lathrop Reported <br /> Dublin CA,94568 Project Manager Deanna}larding 05/13/02 09 26 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Repontng Spice Source %REC RPD <br /> Analyte Result Limit Units Leel Result %REC Limits RPD Limit Notes <br /> Batch 2050009-EPA 5030B IP/T] <br /> Blank(2050009-BLK2) Prepared& Analyzed 05/07/02 <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 ten-butyl ether ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Tert-amyl methyl ether ND 2 0 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1 2-Dichloroethane-d4 495 500 990 70-130 <br /> Surrogate Toluene-d8 498 500 996 70-130 <br /> LCS(2050009-BSI) _ Prepared&Analyzed 05/06/02 <br /> Methyl tert-butyl ether 53 9 20 ug/l 500 108 70-130 <br /> Surrogate 1 2-Dichloroethane-d4 522 500 104 70-130 <br /> Surrogate Toluene-d8 310 500 102 70-130 <br /> LCS(2050009-BS2) Prepared&Analyzed 05/07/02 <br /> Methyl tert-butyl ether 443 20 ug/l 500 886 70-130 <br /> Surrogate 1 2-Dichloroethane-d4 506 500 101 70-130 <br /> Surrogate Toluene-d8 SO 1 500 100 70-130 <br /> Matrix Spike(2050009-MSI) Source L204130-04 Prepared&Analyzed 05/06/02 <br /> Methyl tert-butyl ether 41 3 20 ug/i Soo ND 826 60-140 <br /> Surrogate 1 2-Dichloroethane-d4 438 500 876 70-130 <br /> Surrogate Toluene-d8 479 500 958 70-130 <br /> Matrix Spike Dup(2050009-MSD1) _ Source L204130-04 Prepared& Analyzed 05/06/02 <br /> Methyl tert-butyl ether 422 - 20 ug/l 500 ND 844 -�60-140 2 16 - 25 <br /> Surrogate 1 1-Dichloroethane-0 437 500 874 70-130 <br /> Surrogate Toluene-d8 490 500 980 70-130 <br /> Sequoia Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 13 of 14 <br />