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1551 Industnal Road <br /> Sequoia San Carlos CA 94070 <br /> 232-9600 <br /> vIga) (650)p Analytical FAX(650)232 9612 <br /> WWW sequoialabs Com <br /> Gettler-RyanlGeostrategies(I) Project Tosco(1) <br /> 6747 Sierra Court- Suite] Project Number Tosca(Unocal)SS46981,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 12/27/03 09 39 <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 Lunit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-16(L112085-10)Water Snmpled 12/12/01 17 00 Received 12/13101 19 40 <br /> Purgeable Hydrocarbons as Gasoline 5600 500 ug11 10 1120080 12/20/01 12/20/01 EPA 8021B- P-0I <br /> Benzene 160 5 0 ^ <br /> Toluene ND 5 0 <br /> Ethylbenzene 72 5 0 <br /> Xylenes(total) 270 5 0 " <br /> Methyl tert-butyl ether 210 50 <br /> Surrogate a,a,a-TrOuorotoluene 101 % 70-130 " <br /> VWA (L7 1 2 085-1 1)Water Sampled 12/12/01 14 50 Received 12/13/01 19 40 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ugll 1 1120079 12/20/01 12/20/01 EPA 8021B . <br /> Benzene ND 050 " <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 5 0 <br /> Surrogate aa a-Trtlluorotoluene 100% 70-130 <br /> \iW-3(L1 1 2 085-12)Wa1er Sampled 12/12/01 1620 Received 12/13/011940 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/1 1 1120079 12/20/01 12/20/01 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 5 0 " <br /> Surrogate a,o,a-Trtlluorotoluene 939% 70-130 " <br /> Sequoia 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 5 of 22 <br />