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Dr <br /> a— ) <br /> 885 Jarvis <br /> Sequoia Mogan HiQ,CA 9503737 <br /> 7 <br /> Analytical (408)776-9600 <br /> FAX 408 <br /> www�quoialabs can <br /> URS Corporation[l1 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 /> GasolmOBTEX\Oxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> LS-5-7 MLL0772-13 Soil Sampled 12/18/02 11 30 Received 12/18/02 10 38 <br /> Tert-butyl alcohol ND 0 050 mg/kg 1 3010002 01/01/03 01/01/03 EPA 8260B <br /> Methyl tert-butyl ether ND 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 I 0 " <br /> Surrogate 1,2-DCA-d4 86% 60-140 " <br /> Surrogate Toluene-d8 1.17% 60-140 " <br /> Surrogate 4-BFB 101 % 60-140 " <br /> LS-6-7 LL0772-14 Soil Sampled 12/18/02 11 40 Received 12/18/02 10 38 <br /> Tert-butyl alcohol ND 0 050 mg/kg 1 3010002 01/0I/03 01/01/03 EPA 8260E <br /> Methyl tert-butyl ether ND 00050 " <br /> �i-isopropyl ether ND 00050 " <br /> Ethyl tert-butyl ether ND 0 0050 " <br /> Tert-amyl methyl ether ND 00050 " <br /> Benzene ND 0 0050 " <br /> Ethylbenzene ND 00050 " <br /> Toluene ND 00050 " <br /> Xylenes(total) ND 0 010 " <br /> Gasoline(C6-C10) ND 10 " <br /> Surrogate 12-DCA-d4 79% 60-140 " <br /> Surrogate Toluene-d8 117% 60-140 " <br /> Surrogate 4-BFB 106% 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 stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 9 of 15 <br />