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1551 ]ndusinal Road <br /> 4DSequoia San Carlos CA 94070 <br /> NW (650)232-9600 <br /> W Analytical FAX(650)232 9612 <br /> www sequoialabs corn <br /> ler-Ryan/Geostrategies(1) Project Tosco(1) <br /> 7 Sierra Court,Suite 1 Project Number Tosco#01205 (Circle K),Lathrop Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/13/02 04 26 <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 /> TB-LB(L204130-01)Water Sailed 04/29/02 00 00 Received 04/29/02 17 20 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l 1 2050019 05/09/02 05/09/02 EPA 8021E <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 /> Surrogate a,a,a-Trifluorotoluene 928% 70-130 " <br /> MW-1 (L204130-02)Water Sampled 04/29/02 13 10 Received 04/29/02 17 20 <br /> Purgeable Hydrocarbons as Gasoline 5700 500 ug/l 10 2050018 05/09/02 05/09/02 EPA 8021B P-02 <br /> Benzene 41 5 0 " <br /> Toluene 390 5 0 ^ <br /> Ethylbenzene 340 50 <br /> Xylenes(total) 2000 50 " <br /> Methyl tert-butyl ether ND 50 " <br /> gate a a a-Trifluorotoluene 909% 70-130 ^ <br /> 2 (L204130-03)Water Sampled 04/29/02 11 55 Received 04/29/02 17 20 <br /> Purgeable Hydrocarbons as Gasoline 2000 500 ug/l 10 2050018 05/09/02 ' .'05/09/02 EPA 8021 B P-02 <br /> Benzene 56 5 0 " <br /> Toluene 5 5 5 0 " <br /> Ethylbenzene 130 5 0 ^ <br /> Xylenes(total) 30 5 0 " ^ <br /> Methyl tert-butyl ether 78 50 " <br /> Surrogate a,a,a-Trifluorotoluene 910% 70-130 " <br /> to 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 2 of 14 <br />