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1551 Industrial Road <br /> Sequoia San Carlos CA 94070 <br /> (D (650)232 9600 <br /> ' Analytical FAX(650)2329612 <br /> www sequoialabs com <br /> ler-Ryan/Geostrategies(1) Project Tosco(l) <br /> Sierra Court,Suite J Project Number Tosco#4409,Stockton Reported <br /> Dublin CA,94568 Protect Manager Deanna Harding 05/03/02 10 10 <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA 8015M and BTEXIMTBE by EPA 8021B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-9(L204085-10)Water Sampled 04/18/02 15 50 Received 04/18/02 18 15 <br /> Purgeable Hydrocarbons as Gasoline 2700 1000 ug/l 20 2040092 04/30/02 04/30/02 EPA 9021 B P-01 <br /> Benzene 110 10 " ^ <br /> Toluene 23 10 " <br /> Ethylbenzene 24 10 " ^ <br /> Xylenes(total) 180 10 " ^ <br /> Methyl tert-butyl ether ND 100 " <br /> Surrogate a,a,a-Trifluorotoluene 101 % 70-130 " <br /> MW-10(L204085-11)Water Sampled 04/18/021425 Received 04/18/02 18 15 <br /> Purgeable Hydrocarbons as Gasoline 5900 500 ug/l 10 2040092 04/30/02 04/30/02 EPA 8021B P-01 <br /> Benzene 59 5 0 " ^ <br /> Toluene ND 5 0 " <br /> Ethylbenzene 100 5 0 ^ <br /> Xylenes(total) 24 5 0 <br /> Methyl tent-butyl ether 100 50 " <br /> gate a,a,a-Trefluorotoluene 107% 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 to its entirety <br /> Page 5 of 16 <br />