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1551 Industnal Road <br /> ei) Sequoia San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX(650)232-9612 <br /> www sequoialabs cam <br /> s <br /> ttler-Ryan/Geostrategtes(1) Project Tosco(l) <br /> 47 Sierra Court,Suite J 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 /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1 (L204130-02)Water_ Sampled 04/29/02 13 10 Received 04/29/02 17 20 R-05 <br /> Ethanol ND 2500 ugA 5 2050005 05/06/02 05/06/02 EPA 8260E <br /> 1,2-Dibromoethane ND 10 <br /> 1,2-Dichloroethane ND 10 " <br /> Di-isopropyl ether ND 10 " <br /> Ethyl tert-butyl ether ND 10 ^ <br /> Methyl tert-butyl ether ND 10 ' <br /> Tert-amyl methyl ether ND 10 <br /> Tert-butyl alcohol ND 500 " <br /> Surrogate 1,2-Dichloroethane-d4 906% 70-130 ~ ^ <br /> Surrogate Toluene-d8 101% 70-130 ~ " <br /> MW-2 (L204130-03)Water Sampled 04/29/02 11 55 Received 04/29/02 17 20 <br /> Ethanol ND 500 ug/l 1 2050005 05/06/02 05/06/02 EPA 8260B <br /> 1,2-Dibromoethane ND 2 0 " <br /> 1,2-Dtchloroethane ND 2 0 <br /> ropy!ether ND 2 0 <br /> I t tent-butyl ether ND 2 0 <br /> ethyl tert-butyl ether 62 2 0 <br /> Tert-amyl methyl ether ND 2 0 " <br /> Tert-butyl alcohol 110 100 " <br /> Surrogate 1,2-Dichloroethane-d4 904% 70-130 <br /> Surrogate Toluene-d8 95 0% 70-130 ^ <br /> MW-3(L204130-04)Water Sampled 04/29/02 12 35 Received 04/29/02 17 20 <br /> Ethanol ND 500 ugA 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 /> Di-isopropyl ether ND 2 0 <br /> Ethyl tert-butyl ether ND 2 Q <br /> Methyl tert-butyl ether ND 2 0 " <br /> Tert-amyl methyl ether ND 2 0 +' <br /> Tert-butyl alcohol ND 100 " '+ <br /> Surrogate 1,2-Dtchloroethane-d4 894% 70-130 ~ " <br /> Surrogate Toluene-d8 950% 70-130 ~ <br /> la 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 6 of 14 <br />