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1551 Industrial Road <br /> Sequoia San Carlos CA 94070 <br /> (6S0)232-9600 <br /> Analytical FAX(650)232-9612 <br /> www sequoialabs coin <br /> ler-Ryan/Geostrategies(I Project Tosco(1) <br /> Sierra Court,Suite J Project Number Tosco#5886,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 11/02/01 15 13 <br /> MTBE by DHS LUFT- 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 1100126-EPA 5030B(P/T) <br /> Blank(1100126-BLKI) Prepared&Analyzed 10/29/01 <br /> Methyl ter/-butyl ether ND 50 ugA <br /> Surrogate a,a,a-Trifluorotoluene 108 100 108 60-140 <br /> LCS(1100126-BSI) Prepared&Analyzed 10/29/01 <br /> Methyl tert-butyl ether 470 50 ugA 500 940 70-130 <br /> Surrogate a,a,a-Trrfluorotoluene 103 100 103 60-140 <br /> LCS(1100126-BS2) Prepared&Analyzed 10/29/01 <br /> Surrogate a,a,a-Tr>fluoroioluene 113 ug/1 100 113 60-140 <br /> Matrix Spike(I100126-MSI) Source L110131-08 Prepared 10/29/01 Analyzed 10/30/01 <br /> Methyl Cert-butyl ether 579 5 0 ugA 500 93 972 60-140 <br /> Surrogate a,a a-Trifluorotoluene 10 7 11 100 107 60-140 <br /> liftx Spike Dup(1100126-MSDI) Source LII0131-08 Prepared 10/29/01 Analyzed 10/30/01 <br /> MP[Syl terl-butyl ether 56 6 5 0 ug/l Soo 93 94 6 60-140 227 25 _ <br /> Surrogate a a a-Tr(fluorotoluene 104 100 104 60-140 <br /> Batch 1100127- EPA 5030B(P/T) <br /> Blank(1100127-ELK1) Prepared&Analyzed 10/29/01 <br /> Methyl tert-butyl ether ND 50 ug/I <br /> Surrogate aa a-Tri luorotoluene 108 100 108 60-140 <br /> LCS(I100127-BSI) Prepared&Analyzed ]0/29/01 <br /> Methyl tert-butyl ether 43 6 50 ugA 500 87 2 70-130 <br /> Surrogate a a,a-Trrfluorotoluene 102 100 102 60-140 <br /> Vila Analytical- Sail Carlos The results in this report apply to the samples analyzed in accordance lvith the chain of <br /> custody document This analyical report must be reproduced to its entirety <br /> Page 4 of 6 <br />