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1551 Industrial Road <br /> Sequoia San Carlos CA 94070 <br /> (650)232-9600 <br /> FAX Analytical <br /> www sequoialabs com <br /> After-Ryan/Geostrategies(1) Project Unocal(4) <br /> IW Sierra Court,Suite J Project Number Former Unocal#2859,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 03/04/02 08 47 <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-9(L202097-07)Water Sampled 02/15/02 13 30 Received 02/17/0211 00 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l 1 2020064 02/20/02 02/21/02 EPA 8021E <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 0 54 " <br /> Methyl tert-butyl ether 5 5 5 0 " <br /> Surrogate a,a,a-Trifluorotoluene 107% 70-130 " <br /> MW-17(L202097-08)Water Sampled 02/15/02 14 45 Received 02/17/02 11 00 �- <br /> Purgeable Hydrocarbons as Gasoline 95 50 ug/l 1 2020064 02/20/02 02/21/02 EPA 8021E P-03 <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether ND 50 <br /> .Adhkgate a,a,a-Trifluorotoluene 101 % 70-130 " <br /> -18(L202097-09)Water Sampled 02/15/021538 Received 02/17/02 11 00 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l 1 2020071 02/21/02 02/21/02 EPA 80218 <br /> Benzene ND 050 " <br /> Toluene ND 050 <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 50 " <br /> Surrogate a,a,a-Trifluorotoluene 814% 70-130 " <br /> So a Analytical - San Carlos The results to 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 18 <br />