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865 Jarvis Dr <br /> a_ _� Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www sequoialabs can <br /> URS Corporation[I] Project ARCO#2093,Tracy,CA MLL0772 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO#2093,Tracy,CA Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 01/07/03 14 23 <br /> Gasollne\BTEXIOxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Lint Units Dilution Batch Prepared Analyzed Method Notes <br /> DI-7-4 1/2 MLL0772-0 Soil Sampled 12/18/02 11 00 Received 12/18/02 10 38 <br /> Tert-butyl alcohol ND 0 050 mg/kg 1 2120501 12/31/02 01/01/03 EPA 8260B <br /> Methyl tert-butyl ether 0 015 00050 " <br /> Di-isopropyl ether ND 00050 " <br /> Ethyl tert-butyl ether ND 00050 " <br /> Tert-amyl methyl ether ND 00050 " <br /> Benzene ND 00050 " <br /> Ethylbenzene ND 00050 " <br /> Toluene ND 00050 " <br /> Xylenes(total) ND 0 010 " <br /> Gasoline(C6-C10) ND 10 " <br /> Surrogate 1,2-DCA-d4 83% 60-140 " <br /> Surrogate Toluene-d8 124% 60-140 " <br /> Surrogate 4-BFB 107% 60-140 " <br /> DI-8-4 MLL0772-0$ Soil Sampled 12/18/02 11 05 Received 12/18/02 10 38 <br /> Tert-butyl alcohol ND 0 050 mg/kg 1 2120501 12/31/02 12/31/02 EPA 8260B <br /> ethyl Cert-butyl ether ND 00050 <br /> 0thyl <br /> -isopropyl ether ND 00050 " <br /> tert-butyl ether ND 00050 " <br /> Tert-amyl methyl ether ND 00050 " <br /> Benzene ND 00050 <br /> Ethylbenzene ND 00050 " <br /> Toluene ND 00050 <br /> Xylenes(total) ND 0010 <br /> Gasoline(C6-CIO) ND 1 0 " <br /> Surrogate 1,2-DCA-d4 82% 60-140 " <br /> Surrogate Toluene-d8 129% 60-140 " <br /> Surrogate 4-BFB 118% 60-140 <br /> Sequoia Analytical- Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise staled results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 6 of 15 <br />