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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> ATWOnalytical (707)792 1 <br /> 865 <br /> FAX(707)792-0342342 <br /> www sequoialabs com <br /> 0 <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P409434 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/08/04 09 40 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Uruts Dilution Batch Prepared Analyzed Method Note <br /> VW-1B(P409434-09)Water Sampled 09/23/04 09 20 Received 09/23/04 13 15 <br /> Tert-amyl methyl ether ND 10 ug/1 10 410010I 10/05/04 10/06/04 EPA 8260B <br /> Benzene 8 9- 5 0 " <br /> Tert-butyl alcohol 200 200 " <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dibromoethane(EDB) ND 5 0 " <br /> 1,2-Dichloroethane 18 5 0 " <br /> Ethanol ND 1000 " <br /> Ethylbenzene 79 5 0 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 360 5 4 " <br /> Toluene ND 5 0 " <br /> Xylenes(total) 16 5 0 " <br /> Surrogate Drbromofluoromethane 103% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 108% 74-135 " <br /> rrogate Toluene-d8116% 84-119 " <br /> urrogate 4-Bromofluorobenzene 112% 86-119 " <br /> VW-ZB(P409434-10)Water Sampled 09/23/04 10 07 Received 09/23/04 13 15 <br /> Tert-amyl methyl ether ND 5 0 ug/1 5 4100134 10/06/04 10/07/04 EPA 8260B <br /> Benzene 88 --- 2 5 <br /> Tert-butyl alcohol ND 100 <br /> Di-isopropyl ether ND 5 0 " <br /> 1,2-Dibromoethane(EDB) ND 2 5 <br /> 1,2-Dichloroethane 5 1 2 5 " <br /> Ethanol ND 500 " <br /> Ethylbenzene 15/ 2 5 " <br /> Ethyl tert-butyl ether ND 5 0 " <br /> Methyl tert-butyl ether 79— 2 5 " <br /> Toluene 16— 2 5 " <br /> Xylenes(total) 35 2 5 " <br /> Surrogate Drbromofluoromethane 103% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 107% 74-135 " <br /> Surrogate Toluene-d8 109% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 108% 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 basis <br /> 0 This analytical report must be reproduced in its entirety <br /> Page 11 of 21 <br />