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S eq ]551 Industrial Road <br /> (D— uo is $an mos CA 9400 <br /> (650)232-9600 <br /> Analytical <br /> FAX(650)232-9612 <br /> www sequoialabs com <br /> ler-Ryan/Geostrategics(1) 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-13 L205055-13 Water Sam pled 05/14/02 I1 25 Received 05/14/0217.50 <br /> Purgeable Hydrocarbons as Gasoline NO 50 ug/I 1 2050056 05023/02 05/24/02 EPA 8021E <br /> Benzene NO 0 50 " <br /> Toluene NO 0 50 ^ <br /> Ethylbenzene NO 0 50 ^ ^ <br /> Xylenes(total) NO 050 ^ " <br /> Methyl tert-butyl ether NO 5 0 " ^ <br /> Surrogate a,a,a-Trifluorotoluene 908% 70-130 " <br /> MW-14(L205055-14)Water Sampled 05/14/02 11 45 Received 05/14/_0217.50 _ <br /> Purgeabie Hydrocarbons as Gasoline NO 50 ug/1 1 2050059 05/24/02 05/24/02 EPA 8021B <br /> Benzene NO 050 <br /> Toluene NO 0 50 <br /> Ethylbenzene NO 0 50 " ^ <br /> Xylenes(total) NO 050 <br /> Methyl tert-butyl ether NO 50 ^ ^ <br /> W-115, <br /> te a,a,a-Trtfluorotoluene 103% 70-130 " <br /> (L205055-15)Water Sampled_ 05/14/0212 15 Received 05/14/02 17 50 <br /> Purgeable Hydrocarbons as Gasoline NO 50 ug/l 1 2050059 05/24/02 0524102 EPA 8021B <br /> Benzene NO 050 <br /> Toluene ND 050 <br /> Ethylbenzene 22 0 50 <br /> Xylenes(total) 074 0 50 " n " <br /> Methyl tert-butyl ether ND 5 0 <br /> Surrogate a,a,a-Triuorotoluene 100% 70-130 " <br /> i <br /> I <br /> i <br /> i <br /> *ia 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 20 <br />