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1551 Industrial Road <br /> a— ) Sequoia San Carlos CA 94070 <br /> (650)232-9600 <br /> qW Analytical FAX(650)232-9612 <br /> www sequoraiabs com <br /> Der-Ryan/Geostrategies(l) Project Unocal(4) <br /> Sierra Court, Suite J Project Number Former Unocal#2859,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/30/02 14 17 <br /> Total Purgeable Hydrocarbon (C6-C12) 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 L205055-07 Water Sampled 05/13/02 13 45 Received 05/14/02 17.50 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ugfl 1 2050057 05/23/02 05/23/02 EPA 8021B <br /> Benzene ND 050 <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 0 50 ^ <br /> Methyl tert-butyl ether ND 50 ^ <br /> Surrogate a a,a-TriJluorotoluene 933 % 70-130 " <br /> MW-8 L205055-05 Water Sampled 05/131021507 Received 05/14/02 17 50 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l 1 2050057 05/23/02 05/23/02 EPA 8021B <br /> Benzene ND 050 " <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 <br /> Methyl tert-butyl ether ND 50 <br /> S ate a,a,a-Tri luorotoluene 973 % 70-130 <br /> jg " <br /> (L205055-09)Water Sampled 05/13/02 15 40 Received 05/14/02 17 50 _ <br /> Purgeable Hydrocarbons as Gasoline ND 50 ugA 1 2050057 05/23/02 . 05/23/02 EPA 8021B <br /> Benzene ND 0 50 <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 <br /> Methyl tent-butyl ether 5.3 5 0 <br /> Surrogate a,a,a-Trfluorotoluene 101 % 70-130 " <br /> S*a Analytical -San Carlos The results rn 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 />