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Gettler-Ryan/Geostrategies(1) Project. Tosco(1) 6747 Sierra Court,Suite J Project Number: Tosco#11195,Lathrop,CA Reported: Dublin CA,94568 Project Manager: Deanna Harding 05/25/01 14.01 Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control Sequoia Analytical-San Carlos Reporting Spike Source %REC RPD Analyte Result limit Units level Result %REC limits RPD limit Notes Batch 1050076-EPA 5030B PIT] Blank(1050076-BLK2) Prepared&Analyzed:05/18/01 Ethanol ND 1000 ug/l 1,2-Dibromoethane ND 2.00 " 1,2-Dichlorudhane ND 2.00 " Di-isopropyl ether ND 2.00 " Ethyl tert-butyl ether ND 2.00 " Methyl tertbutyl ether ND 2.00 " Tert-amyl methyl ether ND 2.00 " Tert-butyl alcohol ND 100 " Surrogate:1,2-Dichloroethane-d4 43.6 50.0 87.2 76-114 Surrogate:Toluene-d8 50.3 50.0 101 88-110 S(1050076-BSl) Prepared&Analyzed:05/17/01 Methyl certbutyl ether 41.4 2.OD u@/1 50.0 82.8 70-130 Surrogate:l,2-Dichloroethane-d4 41.3 50.0 82.6 76-114 Surrogate:Toluene-d8 50.2 50.0 100 88-110 LCS(1050076-BS2) Prepared&Analyzed:05/18/01 Methyl tert butyl ether 42.5 2.00 ugll 50.0 85.0 70-130 Surrogate:1,2 Dichloroethane-d4 44.7 50.0 89.4 76-114 Surrogate:Toluene-d8 50.2 50.0 100 88-110 Matrix Spike(1050076-MS1) Source:L105103-02 Prepared&Analyzed:05/17/01 Methyl tent-butyl ether 42.5 2.00 ugli 50.0 ND 85.0 60-140 Surrogate:1,2-Dichloroethane-d4 44.5 50.0 89.0 76-114 Surrogate:Toluene-d8 51.0 50.0 102 88-110 Matrix Spike Dup(1050076-MSD1) Source:L105103-02 Prepared&Analyzed:05/17/01 Methyl to t-butyl ether 43.8 2.00 ug/I 50.0 ND 87.6 60-140 3.01 25 Surrogate:1,2-Dichloroethane-d4 44.1 1150.0 88.2 76-114 Surrogate:Toluene-d8 50.8 50.0 102 88-110 equoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain of custody document.This analytical report must be reproduced in its entirety. Page 17 of 20