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Sequoia 1551 Industrial Road Son Carlos CA 94070 Analytical (650)232-9600 FAR(650)232-9612 www.sequoialabs.com Gettler-Ryan/Geostrateiries(1) Project. Tosco(]) 6747 Sierra Court,Suite J Project Number: Tosco#11195 Reported: Dublin CA,94568 Project Manager: Deanna Harding 02/21/02 08:17 Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B Sequoia Analytical- San Carlos Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-8(L202058-08)Water Sampled:02/07/02 12:20 Received:02/07/02 18:35 Ethanol ND 8300 ugA 16.67 2020039 02/12/02 02/12/02 EPA 8260B 1,2-Dibromoethane ND 33 " " It It 1,2-Dichloroethane ND 33 " " " " to Di-isopropyl ether ND 33 " " or It Ethyl tert-butyl ether ND 33 " Methyl tert-butyl ether 1500 33 Tert-amyl methyl ether ND 33 Tert-butyl alcohol ND 1700 Surrogate:1,2-Dichloroethane-d4 119% 70-130 Surrogate:Toluene-d8 100% 70-130 MW-9(L202058-09)Water Sampled:02/07/02 11:40 Received:02/07/02 18:35 _ Ethanol ND 500 ug/1 1 2020030 .02/12102 02/12/02 EPA 8260B 1,2-Dibromoethane ND 2.0 1,2-Dichloroethane ND 2.0 " Di-isopropyl ether ND 2.0 " Or ' ++ Ethyl tert-butyl ether ND 2.0 Methyl tert-butyl ether ND 2.0 Tert-amyl methyl ether ND 2.0 " +' Tert-butyl alcohol ND 100 " Surrogate:1,2-Dichloroethane-d4 III % 70-130 Surrogate:Toluene-d8 98.2% 70-130 MW-10(L202058-10)Water_ Sampled:02/07/02 11:05 Received:02/07/02 18:35 _ Ethanol ND 25000 ug/1 50 2020039 02/12/02 02/12/02 EPA 8260B 1,2-Dibromoethane ND 100 " " " it 1,2-Dichloroethane ND 100 Di-isopropyl ether ND 100 Ethyl tert-butyl ether ND 100 Methyl tert-butyl ether 4900 100 Tert-amyl methyl ether ND 100 Tert-butyl alcohol ND 5000 Surrogate:112-Dichloroethane-d4 120% 70-130 or Surrogate:Toluene-d8 98.4% 70-130 " " " to Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the ci, of custody document. This analytical report must be reproduced in its entirety. Page 4 of 17