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i? <br /> Gettler-Ryan/Geostrategies(1) Project: Tosco(1) <br /> 6747 Sierra Court,Suite 7 Project Number: Tosco##11195,Lathrop,CA Reported: <br /> Dublin CA,94568 Project Manager: Deanna Harding 05/25/01 14:01 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- San Carlos <br /> Reporting Spike Source °/uREC RPD <br /> Analyte Result Limit Units Level Result °/uREC Limits RPD limit Notes <br /> Batch 1050077-EPA 5030B IP/T] <br /> LCS(1050077-1352) Prepared&Analyzed:05/19/01 <br /> Methyl tert-butyl ether 44.9 2.00 ugll 50.0 89.8 70-130 <br /> Surrogate:1,2Dichloroethane-d4 49.1 50.0 98.4 76-114 <br /> Surrogate:Toluene-d8 52.9 50.0 106 88-110 <br /> Matrix Spike(1050077-MSI) Source:L105110-09 Prepared&Analyzed:05/18/01 <br /> Methyl tent-butyl ether 44.6 2.00 ug/1 50.0 ND 89.2 60-140 <br /> Surrogate:1,2 Dichloroethane-d4 46.8 50.0 93.6 76-114 <br /> Surrogate:Toluene-d8 52.3 50.0 Jos 88-110 <br /> Matrix Spike Dup(1050077-MSD1) Source:L105110-09 Prepared&Analyzed:05/18/01 <br /> `ethyl tet#-butyl ether 42.3 2.00 ugll 50.0 ND 84.6 60-140 5.29 25 <br /> c.:..:_ <br /> 50.0 94.2 76-114 <br /> ogate:1,2-Dichioroethane-d4 47.1 <br /> Surrogate;Toluene-d8 51.2 50.0 102 88-110 <br /> equoia Analytical- San 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 in its entirety. <br /> Page 19 of 20 <br />