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404 N Wiget Lane <br /> Sequoia Walnut Greek CA 94598 <br /> (925)988-9600 <br /> FAX(925)988-9673 <br /> a- Analytical www sequoialabs corn <br /> Gettler Ryan,Inc -Dublin Project Tosco <br /> 6747 Sierra Court Suite J Project Number Tosco# 11192 Reported <br /> Dublin CA,94568 Project Manager Doug Lee 10-May-O 1 17 06 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyke Result Limit Units Level Result %REC Linuts RPD Limit Notes <br /> Batch lE09011 -EPA 5030B(P/T) <br /> LCS (lE09011-BS2) Prepared&Analyzed 09-May-01 <br /> Methyl tert-butyl ether 471 20 ugll 500 942 70-130 <br /> Surrogate Dibromofluoromethane 540 500 108 50-150 <br /> Surrogate 12-Drchloroethane-d4 570 500 114 50-150 <br /> Matrix Spike(1E09011-MS1) Source W104546-03 Prepared 09-May-01 Analyzed 10-May-01 <br /> Methyl tent-butyl ether 53 1 20 ug/l 500 9 5 872 60-150 <br /> Surrogate Dibromofluoromethane 530 " .500 106 50-150 <br /> Surrogate 1 2-Drchloroethane-d4 570 " 500 114 50-150 <br /> Matrix Spike Dup (IE09011-MSD1) Source W104546-03 Prepared&Analyzed 09-May-01 <br /> Methyl tert-butyl ether 560 20 ug/1 500 95 930 60-150 532 25 <br /> aogRate Dibromofluoromethane 51 0 500 101 50-150 <br /> are 1 2-Dichloroethane-d4 560 500 112 50-150 <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 at its eutiretj <br /> Page 6 of 9 <br />