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Sequoia San an Carlos rCA Road <br /> 23 -9600 <br /> (650)232-9600 <br /> 1w Analytical FAX equoi232-9612 <br /> www sequoialabs coin <br /> Ryan/Geostrategies(1) Project Tosco(l) <br /> 6 Slerra Court,Suite J Project Number Tosco(Unocal)SS#6981,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/07/02 12 56 <br /> Total Purgeable Hydrocarbon (C6-02) by EPA 8015M and BTEX/MTBE by EPA 8021B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-7(L203104-07)Water Sampled 03/20/02 16 50 Received 03/21/02 18 40 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l 1 2040003 04/01/02 04/01/02 EPA 80218 <br /> Benzene ND 0 50 " <br /> Toluene ND 050 " <br /> Ethylbenzene NO 050 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether ND 5 0 <br /> Surrogate a a,a-Trifluorotoluene 104% 70-130 " <br /> MW-8(L203104-08)Water Sampled 03/20/02 13 25 Received 03/21/02 18 40 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l 1 2030088 03/29/02 03130/02 EPA 8021B <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 <br /> Methyl tert-butyl ether NO 5 0 " <br /> SOto a,a,a-Trifluorotoluene 102% 70-130 " <br /> MW-9(L203104-09)Water Sampled 03/20/02 11 10 Received 03/21/02 18 40 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l 1 2030088 03/29/02 03/30/02 EPA 8021B <br /> Benzene ND 0 50 <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 5 4 " <br /> Surrogate a,a,a-Trifluorotoluene 992% 70-130 " <br /> 1a 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 4 of 20 <br />