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ndustnal <br /> S n51 1 <br /> Road <br /> Sequoia Car los CA 94070 <br /> 1:1) (650)232-9600 <br /> low Analytical <br /> FAX(650)232-96i2 <br /> www sequoialabs corn <br /> Gettler-Ryan/Geostrategies(I) Project Tosco(l) <br /> 6747 Sierra Court,Suite J Project Number Tosca(Unocal)SS46981 Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 09/27/01 10 19 <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA-8015M and BTEX/MTBE by EPA 8021B- - <br /> Sequola Analytical - San Carlos <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-7(L109080-07)Water Sampled 09/13/01 13 50 Received 09/1310) 19 30_ <br /> Purgeable Hydrocarbons as Gasoline 70 50 ug/I 1 1090095 09/24/01 09/25/01 DHS LUFTP-03 <br /> Benzene ND 050 " ^ <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether 200 50 <br /> Surrogate a,a,a-Trifluorololuene J31 % 70-130 S-04 <br /> A1W-8(L109080-08)Water Sampled 09/12/01 14 10 Received 09/13/01 19 30 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ugA 1 1090095 09/24/01 09/25/01 DHS LUFT <br /> Benzene ND 050 " <br /> Toluene 12 050 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) 099 050 " <br /> Methyl tert-butyl ether ND 5 0 " <br /> Surrogate a,a,a-Trtfluorotoluene 118% 70-130 " <br /> MW-9(L109080-09)Water Sampled 09/12/01 11-55 Received 09/13/01 19 30 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/I 1 1090095 09/24/01 09/25/01 DHS LUFT <br /> Benzene 094 0 50 <br /> Toluene ND 0 50 <br /> Ethvlbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 5 Q " <br /> Surrogate a,a a-Triuorotoluene 113% 70-130 " <br /> Sequola Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 4 of 21 <br />