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a_ _� (1551 Industrial Road <br /> Sequoia San Carlos CA 94070 <br /> Analytical FAX <br /> 650)232-9600 <br /> (650)232-9612 <br /> www,sequoialabs.com <br /> f er-Ryan/Geostrategies(1) Project: Tosco(1) <br /> 6;-a7 Sierra Court, Suite J Project Number: Tosca 411195,Lathrop,CA Reported: <br /> Dublin CA,94568 Project Manager: Deanna Harding 12/10/01 19:11 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analyte Result limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-8(L111147-08)Water Sampled: 11/21/01 12:05 Received: 11/21/0118:15 <br /> Ethanol ND 5000 ug/l 10 1110100 11/28/01 11/28/01 EPA 8260B <br /> 1,2-Dibromoethane ND 10 " <br /> 1,2-Dichiorcethane ND 10 <br /> Di-isopropyl ether ND 10 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 1700 10 <br /> Tett-amyl methyl ether 31 10 " <br /> Tert-butyl alcohol ND 200 <br /> Surrogate: 1,2-Dichloroethane-d4 108% 70-130 <br /> Surrogate:Toluene-d8 99.6% 70-130 <br /> MW-9 L1 11147-09)Water Sampled., 11121/01 11:30 Received: 11/21/01 18:15 <br /> Ethanol ND 500 ug/l 1 1110104 11/29/01 11/29/01 EPA 8260B <br /> 1,2-Dibromoethane ND 1.0 <br /> 1,2-Dichloroethane ND 1.0 " <br /> ether ND 1.0 " <br /> >t r==`rtert-butyl ether ND 1.0 <br /> Methyl tert-butyl ether ND 1.0 " <br /> Tert-amyl methyl ether ND 1.0 <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate:1,2-Dichloroethane-d4 106% 70-130 " <br /> Surrogate: Toluene-d8 97.2% 70.130 <br /> MW-10(L111147-10)Water Sampled: 11/21/01 10:50 Received: 11/21/01 18:15 <br /> Ethanol ND 71000 ugll 142.86 1110100 11/28/01 11/28/01 EPA 8260B <br /> 1,2-Dibromoethane ND 140 " <br /> 1,2-Dichloroethane ND 140 " <br /> Di-isopropyl ether ND 140 " <br /> Ethyl tent-butyl ether ND 140 " <br /> Methyl lert-butyl ether 22000 140 " <br /> Tert-amyl methyl ether ND 140 f <br /> Tert-butyl alcohol ND 2900 Pi " i <br /> Surrogate: 1,2-Dichloroethane-d4 <br /> 109% 70-130 " <br /> Surrogate: Toluene-d8 104% 70-130 " <br /> ! <br /> iia 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 9 of 18 <br /> i <br />