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i <br /> 1455 McDowell Blvd North Ste <br /> Sequoia Petaluma,CA 999544 <br /> eD (707) <br /> 4792 1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA 95833 Project Manager Vernon P Elarth 01118/OS 11 34 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result tamp Units Dilution Batch Prepared Analyzed Method Nate <br /> VW-1(P412423-08RE1)Water Sampled 12/20/04 12 50 Received 12/23/04 14 30 CL <br /> Ethylbeniene 96 50 ug/1 10 5010138 01/11/05 01/11/05 EPA 82608 <br /> Surrogate Dibromofluoromethane 97% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 100% 74-135 " <br /> Surrogate Toluene-d8 108% 84-119 " <br /> Surrogate 4 Btonrofluorobenzene 99% 86-119 " <br /> VW-2(1'412423-09)Water Sampled 12/21/04 05 55 Received 12/23/04 10 30 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 5010022 01/04/05 01/04/05 EPA 82606 <br /> Benzene 1 1 050 n ^ <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 <br /> 1,2-Dichloroethane 25 050 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 <br /> ethyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 93% 84-122 <br /> Surrogate 12-Dichloroethane-d4 90% 74-135 <br /> Surrogate 7oltiene-d8 106% 84-119 <br /> Surrogate 4-Bromof7uorobenzene 106% 86-119 " <br /> VW-3(P412423-10)Water Sampled 12/20/04 13 38 Received 12/23/04 10 30 <br /> Tert-amyl methyl ether ND 1 0 ugA 1 5010012 01/03/05 01/03/05 EPA 8260E <br /> Benzene 10 050 " <br /> Tert-butyl alcohol ND 20 ^ " <br /> Di-isopropyl ether ND 10 ^ <br /> 1,2-Dichloroethane 14 050 " <br /> Ethanol ND 100 <br /> Ethylben7ene 38 050 " <br /> Ethyl tt,rt-butyi ether ND 10 " <br /> Methyl tet t-butyl ether 069 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) 14 0 50 <br /> Surrogate Dibromofluoromethane 94% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 93% 74-135 " <br /> Surrogate Toluene-d8 107% 84-119 " <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 basis <br /> This analytical report must be reproduced in its entirety <br /> Page 10 of 33 <br />