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q sas Jarvis Dr <br /> Sequoia MQganHt0,CA95037 <br /> a— ) <br /> Analytical 408)772-9600 <br /> FAX((408)7$2-6308 <br /> www mquoialabs 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 /> Gasollne\BTEXIOxygenates by EPA method 8260B <br /> Sequoia Analytical- Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> DI-5-3 1/LJMLL0772-05)Soil Sampled 12/18/02 10 50 Received 12/18/02 10 38 <br /> Tert-butyl alcohol ND 0 050 mglkg 1^ 2120501 12/31/02 12/31/02 EPA 8260B <br /> Methyl tert-butyl ether ND 0 0050 " <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 00077 00050 " <br /> Toluene ND 00050 " <br /> Xylenes(total) 0 078 0 010 " <br /> Gasoline(C6-C10) ND 1 0 " <br /> Surrogate 12-DCA-d4 76% 60-140 " <br /> Surrogate Toluene-d8 117% 60-140 " <br /> Surrogate 4-BFB 105% 60-140 " <br /> DI-&4(MLL0772-06)Soil Sampled 12/18/02 10 55 Received 12/18/02 10 38 <br /> Tert-butyl alcohol ND 0 050 rng/kg 1 2120501 12/31/02 12/31/02 PPA 8260B <br /> Methyl tert-butyl ether ND 0 0050 " <br /> �i-isopropyl ether ND 0 0050 <br /> Ethyl tert-butyl ether ND 00050 " <br /> Tert-amyl methyl ether ND 0 0050 " <br /> Benzene ND 0 0050 " <br /> Ethylbenzene ND 00050 " <br /> Toluene ND 00050 " <br /> Xylenes(total) 0 011 0 010 " <br /> Gasoline(C6-C10) ND 1 0 " <br /> Surrogate 12-DCA-d4 90% 60-140 " <br /> Surrogate Toluene-d8 122% 60-140 " <br /> Surrogate 4-BFB 104% 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 5 of 15 <br />