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1551 lndustrnal Road <br /> Sequoia San Carlos CA 94070 <br /> (D (650)232-9600 <br /> ► Analytical FAX(650)232-9612 <br /> ` www sequoialabs corn <br /> s <br /> ler-Ryan/Geostrategles(1) Project Tosco(1) <br /> 7 Sierra Court,Suite] Project Number Tosco#01205 (Circle K),Lathrop Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/13/02 09 26 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B <br /> Sequoia Analytical - San Carlos <br /> Reportuig <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-7 (1.204130-08)Water_ Sampled 04/29/02 14 50 Received 04/29/02 17 20 R-05 <br /> Ethanol ND 10000 ug/l 20 2050009 05/06/02 05/06/02 EPA 8260E <br /> 1,2-Dibromoethane ND 40 " <br /> 1,2-Dichloroethane ND 40 " <br /> Dr-isopropyl ether ND 40 <br /> Ethyl tert-butyl ether ND 40 " <br /> Methyl tent-butyl ether ND 40 " <br /> Tert-amyl methyl ether ND 40 " <br /> Tert-butyl alcohol ND 2000 " ^ <br /> Surrogate 1 2-Dichloroethane-d4 918% 70-130 <br /> Surrogate Toluene-d8 992% 70-130 " <br /> MW-8(L204130-09)Water Sampled 04/29/02 10 45 Received_ 04/29/02 17 20 <br /> Ethanol ND 500 ug/1 1 2050009 05/06/02 05/06/02 EPA 8260B <br /> 1,2-Dibromoethane ND 2 0 " <br /> 1,2-Dichloroethane ND 2 0 ^ <br /> � <br /> opropyl ether ND 2 0 <br /> tert-butyl ether ND 2 0 <br /> Methyl tert-butyl ether ND 2 0 " <br /> Tert-amyi methyl ether ND 2 0 " <br /> Teri-butyl alcohol ND 100 " <br /> Surrogate 1,2-Dichloroethane-d4 958% 70-130 <br /> Surrogate Toluene-d8 992% 70-130 " <br /> MW-9(1-204130-10)Water Sampled 04/29/02 13 45 Received 04/29/02 17 20 R-05 <br /> Ethanol ND 5000 ug/l 10 2050009 05/06/02 05/06/02 EPA 9260B <br /> 1,2-Dibromoethane ND 20 <br /> 1,2-Dichloroethane ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 ^ <br /> Methyl tert-butyl ether ND 20 <br /> Tert-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 1000 " <br /> Surrogate 1,2-Dichloroethane-d4 888% 70-130 " <br /> Surrogate Toluene-d8 980% 70-130 <br /> is Analytical - San Carlos The results in this report apply io the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 8 of 14 <br />