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1551 lndustnal Road <br /> Sequoia San Carlos CA 94070 <br /> Analytical (630)232-9600 <br /> mW,WFAX(650)232-9612 <br /> www sequoialabs corn <br /> ]er-Ryan/Geostrategies(1} Protect Tosco(1) <br /> 7 Sierra Court,Suite J Project Number Tosco(Unocal)SS#6981,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/07/02 12 56 <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(L203104-01)Water Sampled 03/20/02 00 00 Received 03/21/02 18 40 _ <br /> Purgeable Hydrocarbons as Gasoline ND — -- 50 ug/I 1 2030988 03/29/02 03/29/02 EPA 8021B <br /> Benzene ND 050 It <br /> Toluene ND 050 " " " " It +' <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 <br /> Methyl tert-butyl ether ND 5 0 <br /> Surrogate a,a,a-Tnfluorotoluene 103% 70-130 " <br /> MW-1 (L203104-02)Water Sampled 03/21/02 1015 Received 03/21/02 18 40 <br /> Purgeable Hydrocarbons as Gasoline 160 50 ug/1 1 2030088 03/29/02 03/29/02 EPA 8021B P-03 <br /> Benzene 2 4 050 ^ <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 5 0 " " <br /> 0ate a a,a-Trifluorotoluene 113% 70-130 <br /> 2 (L2 03 1 04-03)Water Sampled 03/21/0211 15 Received 03/21/02 18 40 _ <br /> Purgeable Hydrocarbons as Gasoline 650 200 ugA 4 2040002 04/01/02 04/01/02 EPA 8021B P-01 <br /> Benzene 120 2 0 <br /> Toluene 2 1 2 0 " ++ <br /> Ethylbenzene ND 2 0 <br /> Xylenes(total) 17 2 0 <br /> Methyl tert-butyl ether 100 20 <br /> Surrogate ax a-Trifluorotoluene 845% 70-130 " <br /> is 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 20 <br />