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a— ) 1455 Mcbwell Blvd North Ste D <br /> oSequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P406072 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/17/04 17 27 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Castrol <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyse Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4F14005-EPA 5030E P/T <br /> Matrix Spike(4F14005-MSI) Source MNF0284-03 Prepared 06/14/04 Analyzed 06/15/04 <br /> Ethanol 20700 10000 ug/1 20000 NO 104 31-143 <br /> tert-Butyl alcohol 14200 2000 5000 10000 840 56-131 <br /> Methyl tert-butyl ether 4910 50 1000 4000 91 0 63-137 <br /> Di-isopropyl ether 906 50 1000 NO 906 76-130 <br /> Ethyl tert-butyl ether 939 50 1000 NO 939 81-121 <br /> tent-Amyl methyl ether 975 50 1000 NO 975 82-140 <br /> 12-Dichloroethane 1200 50 1000 NO 120 77-136 <br /> 1 2-Dibromoethane(EDB) 1050 50 1000 NO 105 77-132 <br /> Surrogate 1 2-Dichloroeihane-d4 576 500 115 78-119 <br /> Matrix Spike Dup(4FI4005-MSD1) Source MNF0284-03 Prepared 06/14/04 Analyzed 06/15/04 <br /> Ethanol 20900 10000 ug/l 20000 NO 104 31-143 0 962 20 <br /> Ort-Butyl alcohol 16100 2000 X 5000 10000 122 56-131 125 20 <br /> ethyl tert-butyl ether 4670 50 1000 4000 670 63-137 501 20 <br /> Di-isopropyl ether 866 50 1000 ND 866 76-130 451 20 <br /> Ethyl tert-butyl ether 899 50 1000 ND 899 81-121 435 20 <br /> tert-Amyl methyl ether 932 50 1000 NO 932 82-140 451 20 <br /> 12-Dichloroethane 1180 50 1000 ND 118 77-136 168 20 <br /> 1 2 Dibromoethane(EDB) 1030 50 1000 NO 103 77-132 1 92 20 <br /> Surrogate 12-Dichloroethane d4 542 500 108 78-129 <br /> Sequoia Analytical-Petaluma 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 t I <br />