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Sequoia 155E Industrial Road San Carios CA 94070 Analytical (650)232-9600 FAX(650)232-9612 www sequoiatabs corn ttler-Ryari/Geostrategiest 1) Project Tosco(l) 7 Sierra Court,Suite J Project Number Tosco#4409,Stockton Reported Dublin CA,94568 Project Manager Deanna Harding 05/03/02 10 10 Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B Sequoia Analytical - San Carlos Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW4 L204085-05 Water Sampled 04/18/02 10 40 Received 04/18/02 18 15 Ethanol ND 500 u0 1 2040064 04/22/02 04/22/02 EPA 8260B 1,2-Dibromoethane ND 2 0 „ 1,2-Dichloroethane ND 2 0 " Di-isopropyl ether ND 2 0 Ethyl tert-butyl ether ND 2 0 Methyl tert-butyl ether 10 2 0 " Tert-amyl methyl ether ND 2 0 Tert-butyl alcohol ND 100 „ Surrogate 1,2-Dichloroethane-d4 118% 70-130 " Surrogate Toluene-d8 982% 70-130 MW-5(L204085-06)Water Sampled 04/18/02 15 05 Received 04/18/02 18 15 R-05 Ethanol ND 1000 ugn 2 2040067 04/25/02 04/25/02 EPA 8260B 1,2-Dibromoethane ND 40 1,2-Dichloroethane 6 8 40 propyl ether ND 4 0 tert-butyl ether ND 40 " yl tert-butyl ether ND 40 „ Tert-amyl methyl ether ND 40 Tert-butyl alcohol ND 200 " Surrogate 1,2-Dichloroethane-d4 107% 70-130 Surrogate Toluene-d8 102% 70-130 " MW-6 L204085-07 Water Sampled 04/18/02 13 40 Received 04/18/02 18 15 R-05 Ethanol ND 1200 ug/l 25 2040067 04/25/02 04/25/02 EPA 8260B 1,2-Dibromoethane ND so 1,2-Dichloroethane ND 50 Di-isopropyl ether ND 50 Ethyl tert-butyl ether ND 50 „ Methyl tert-butyl ether ND 50 Tert-amyl methyl ether ND 50 Teri-butyl alcohol ND 250 „ Surrogate 1,2-Dichloroethane-d4 103 % 70-130 Surrogate Toluene-d8 102 % 70-130 „ to 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 7 of 16