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885 Jarvis Dr <br /> lz� Sequoia MagiriHID,CA95037 <br /> Analytical (448)782-6306 <br /> FAX 408 782-6308 <br /> www sequoialabs can <br /> URS Corporation[1] 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 /> Gasoline\BTEXIOxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> LS-3-5 LL0772-11 Soil Sampled 12/18/02 11 15 Received 12/18/02 10 38 <br /> Tert-butyl alcohol 010 0 050 mg/kg 1 3010002 01/01/03 01/01/03 FPA 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 1 0 " <br /> Surrogate 12-DCA-d4 84% 60-140 " <br /> Surrogate Toluene-d8 117% 60-140 " <br /> Surrogate 4-BFB 98% 60-140 " <br /> LS4-5 1/2(MLL0772-12)Soil Samples] 12/18/02 11 25 Received 12/18/02 10 38 HT-RS <br /> Tert-butyl alcohol ND 0 050 mg/kg 1 3010002 01/01/03 01/02/03 EPA 8260B <br /> ethyl tert-butyl ether ND 00050 <br /> i-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-C 10) ND 10 " <br /> Surrogate 1,2-DCA-d4 80% 60-140 " <br /> Surrogate Toluene-d8 117% 60-140 " <br /> Surrogate 4-BFB 101 % 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 slated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 8 of 15 <br />