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' 885 Jarvis Dr Sequoia Hargan HSA,CA 9503?37 a— (408)782-4600 Analytical FAX(408)782-6308 www sequnialabs ccm URS Corporation[1] Project ARCO 42093,Tracy,CA MLL0772 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO 42093,Tracy,CA Reported Sacramento CA,95833 Project Manager Vern Elarth 01/07/03 14 23 Gasollne\BTEXIOxygenates by EPA method 8260B Sequoia Analytical - Sacramento Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes LS-1-5 MLL0772-09 Soil Sampled 12/18/02 10 15 Received 12/78/02 10 38 Tert-butyl alcohol ND 0 050 mg/kg 1 2120501 12/31/02 01/01/03 EPA 8260B Methyl tert-butyl ether ND 00050 " Di-isopropyl ether ND 00050 " Ethyl tert-butyl ether ND 00050 " Tert-amyl methyl ether ND 00050 " Benzene ND 00050 " Ethylbenzene ND 00050 Toluene ND 00050 Xylenes(total) ND 0 010 " Gasoline(C6-CIO) ND 10 " Surrogate 12-DCA-d4 81% 60-140 " Surrogate Toluene-d8 118% 60-140 " Surrogate 4-BFB 106910 60-140 " LS-2-4 112(MLL0772-10)Soil Sampled 12/18/02 10 40_Received 12/18/02 10 38 _-- Tert-butyl alcohol ND 0 050 mg/kg 1 3010002 01/01/03 01/01/03 EPA 82608 ,asVethyl tent-butyl ether ND 00050 i-isopropyl ether ND 00050 " Ethyl tert-butyl ether ND 00050 " Tert-amyl methyl ether ND 00050 " Benzene ND 00050 Ethylbenzene ND 00050 " Toluene ND 0 0050 " Xylenes(total) ND 0 010 " Gasoline(C6-C10) ND 1 0 " Surrogate 1,2-DCA-d4 80% 60-140 Surrogate Toluene-d8 121 % 60-140 " Surrogate 4-BFB 105% 60-140 " Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of custody document Unless otherwise stated results are reported on a wet weight basis • This analytical report must be reproduced in its entirety Page 7 of IS