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404 N Wlget Lane <br /> Sequoia Walnut Creek C94598 <br /> 4 a) (925)988 8-9600 <br /> Analytical www (925)988-9673 <br /> www sequolalabs coin <br /> *t-tlerRyan,Inc -Dublin Project Tosca Aak <br /> 6747 Sierra Court Suite J Prolect Number Tosco# 1 l 192 Reported <br /> Dublin CA,94568 Project Manager Doug Lee 21-Dec-00 09 57 <br /> MTBE by EPA Method 8260A - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Linut Units Level Result %REC Lm uts RPD Lunt Notes <br /> Batch OL12004-EPA 5030B fP/T] <br /> Blank(OL12004-BLK4) Prepared&Analyzed 13-Dec-00 <br /> Methyl tert-butyl ether ND 20 ug/I <br /> Surrogate Dibromofluoromethane 470 500 940 50-150 <br /> LCS(OL12004-BS4) Prepared&Analyzed 13-Dec-00 <br /> Methyl tert-butyl ether 420 20 ug/l 500 840 70-130 <br /> Surrogate Dibromofluoromethane 470 500 940 50-150 <br /> Matrtx Spike(OL12004-MSI) Source W012080-04 Prepared 11-Dec-00 Analyzed 13-Dec-00 <br /> Methyl tert-butyl ether 450 20 ug/1 500 ND 900 60-150 <br /> Surrogate Dibromofluoromethane 500 11500 100 50-150 <br /> Matrix Spike Dup (OL12004-MSDI) Source W012080-04 Prepared 11-Dec-00 Analyzed 13-Dec-00 <br /> UAW iert-butyl ether 490 20 ug/I Soo ND 980 60-150 851 25 <br /> qIgprogare Dibromofluoromethane 510 500 102 50-150 <br /> W <br /> uoia Analytical-Walnut Creek 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 5 of 6 <br />