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� 885 Jarvis Dr Sequoia Ma in Hill,CA 95037 (408)776-9600 Analytical FAX(408)782fi308 www.sequoialabs.cun URS Corporation[II Project: ARCO#434 MLJ0673 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#434 Reported: Sacramento CA,95833 Project Manager: Vern Elarth 11/12/02 10:24 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical -Morgan Hill Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes DI-1 (MLJ0673-07)Soil Sampled: 10/22/02 12:15 Received:10/22/02 16:30 Total Xylenes ND 1.2 ug/kg 2.4400000 2128036 10/28/02 10/29/02 EPA 82608 Benzene ND 1.2 Ethylbenzene ND 1.2 " Toluene ND 1.2 " Surrogate:DibromoJluoromethane 103% 60-140 " Surrogate:1,2-Dichloroethane-d4 104% 60-140 " Surrogate:Toluene-d8 82.2% 60-140 " Surrogate:4-BromoJluorobenzene 93.0% 60-140 " tert-Butyl alcohol ND 49 2.4400000 0-10 Methyl tert-butyl ether NO 1.2 " Di-isopropyl ether ND 1.2 " Ethyl tert-butyl ether ND 1.2 " tert-Amyl methyl ether ND 1.2 " Surrogate:1.2-Dichloroethane-d4 104% 60-140 " DI-2(MLJ0673-08)Soil Sampled-10/22/02 12:20 Received:10/22/02 16:30 Total Xylenes ND 0.94 ug/kg 1.8899999 2128036 10/28/02 10/29/02 EPA 82608 Benzene ND 0.94 Ethylbenzene ND 0.94 " Toluene ND 0.94 " Surrogate:DibromoJluoromethane 104% 60-140 " Surrogate:1,2-Dichloroethane-d4 103% 60-140 " Surrogate:Toluene-d8 88.0% 60-140 " Surrogate:4-Bromofluorobenzene 101 % 60-140 " tert-Butyl alcohol ND 38 1.8899999 0-10 Methyl tert-butyl ether ND 0.94 " Di-isopropyl ether NO 0.94 " Ethyl tert-butyl ether ND 0.94 " tert-Amyl methyl ether ND 0.94 " Surrogate:1,2-Dichloroethane-d4 103% 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. 9of16