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M <br /> Sequoia 1551 Industrial Road <br /> San Carlos CA 94070 <br /> r (650)232-9600 <br /> Analytical <br /> FAX{650}232-9612 <br /> www sequoialabs com <br /> r ler-Ryan/Geostrategies(I} Protect Tosco(I) <br /> l 7 Sierra Court,Suite) Project Number Tosco#4409, Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/03/02 10 10 <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 2040067-EPA 5030B JP/T <br /> Blank(2040067-BLK2) Prepared&Analyzed 04/25/02 <br /> Ethanol ND 500 ugA <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 tent-butyl ether ND 20 „ <br /> Ten-amyl methyl ether ND 20 " <br /> Teri-butyl alcohol ND 100 " <br /> Surrogate 1 2-Dichloroethane-d4 551 500 110 70-130 <br /> Surrogate Toluene-d8 521 500 104 70-130 <br /> LCS(2040067-BSI) Prepared&Analyzed 04/22/02 <br /> Methyl Leri-butyl ether 55 6 20 ug/1 500 IH 70-130 <br /> ate 12-Dichloroethane-d4 554 500 111 70-130 <br /> ate Toluene-d8 510 500 102 70-130 <br /> LCS(2040067-BS2) Prepared& Analyzed 04/25/02 <br /> Methyl Cert-butyl ether 51 0 20 ug/l 500 102 70-130 <br /> Surrogate 1 2-Dtchloroethane-d4 548 500 110 70-130 <br /> Surrogate Toluene-d8 536 500 107 70-130 <br /> Matrix Spike(2040067-MSI) Source L204085-09 Prepared& Analyzed 04/22/02 <br /> Methyl tert-butyl ether 51 5 20 ug/1 500 ND 103 60-140 <br /> Surrogate 12-Dtchloroethane-d4 485 500 970 70-130 <br /> Surrogate Toluene-d8 510 500 102 70-130 <br /> Matrix Spike Du (2040067-MSBI) Source L204085-09 Prepared&Analyzed 04/22/02 <br /> Methyl tert-butyl ether 489 20 ug/I 500 ND 978 60-140 5 18 25 <br /> Surrogate 12-Dichloroethane-& 476 500 952 70-130 <br /> Surrogate Toluene-d8 519 500 104 70-130 <br /> S a Analytical-5an 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 iii its entirety <br /> Page 15 of 16 <br />