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i <br /> i <br /> i <br /> ' <br /> Sequoia 1455MeDowP Blvd North Ste Petaluma,CA 949544 <br /> (707)792-1865 <br /> Analytical FAX 792-0342 <br /> www sequoiequoeaEabs corn ' <br /> I <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P412405 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number G091Z-0164 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 0111 1105 10 44 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical _Petaluma <br /> Reporting <br /> Analyte Result Lamit Units Dilution Batch Prepared Analyzed Method Note <br /> VW-1B(P412405-09)Water Sampled 12/21/04 13 55 Received 12/22/04 13 15 <br /> Tert-amyl methyl ether ND I00 ug/l 100 5010028 01/04/05 01/04/05 EPA 8260B <br /> Benzene ND 50 " <br /> Tert-butyl alcohol ND 2000 <br /> Di-isopropyl ether ND 100 <br /> 1,2-Dibromoethane(EDB) ND 50 " <br /> 1,2-Dichloroethane ND 50 " <br /> Ethanol ND 10000 " <br /> Ethylbenzene ND 50 " <br /> Ethyl tert-butyl ether N ) 100 " <br /> Methyl tert-butyl ether 2000 50 " <br /> Toluene ND 50 " <br /> Xylenes(total) ND 50 " <br /> Surrogate Dibromofluoromethane 104% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 116% 74-135 " <br /> Surrogate Toluene-d8 108% 84-119 " <br /> Surrogate 4-BromoJ7uorobenzene 109% 86-119 " <br /> VW-2B(P412405-10)Water Sampled 12/21/04 19 36 Received 12/22/04 13 15 <br /> Tert-amyl methyl ether ND — 25 ug/1 25 5010028 01/04/05 01/04/05 EPA 8260E <br /> Benzene 16 / 12 " <br /> Tert-butyl alcohol 630 500 " <br /> Di-isopropyl ether ND 25 " <br /> 1,2-Dibromoethane(EDIT) ND 12 " <br /> 1,2-Dichloroethane 21 12 <br /> Ethanol ND 2500 " <br /> Ethylbenzene ND 12 " <br /> Ethyl tert-butyl ether ND 25 " <br /> Methyl tert-butyl ether 460 12 " <br /> Toluene 120 12 " <br /> Xylenes(total) 320 12 " <br /> Surrogate Dibromgfluoromethane 106% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 120% 74-135 " <br /> Surrogate Toluene-d8 109% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 110% 86-119 " <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 bases <br /> This analytical report mast be reproduced to its entirety <br /> Page 11 of 18 <br />