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1455 McDowell Blvd,North Ste D <br /> Sequoia Petalumai,CA 94954 <br /> 7p7)792-1865 <br /> a— )► Analytical FAX(707)792-0342 <br /> www sequoralabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/04 1129 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> VW-10(P409397-16)Water Sampled 09/20/04 14 31 Received 09/22/04 15 10 <br /> Tert-amyl methyl ether ND 50 ug/1 5 4090752 09/30/04 09/30/04 EPA 8260B <br /> Benzene 84 2 5 " <br /> Tert-butyl alcohol ND 100 <br /> Di-isopropyl ether ND 5 0 " <br /> 1,2-Dichloroethane ND 2 5 <br /> Ethanol ND 500 <br /> Ethylbenzene 37 2 5 " <br /> Ethyl tert-butyl ether ND 5 0 " <br /> Methyl tert-butyl ether ND 25 " <br /> Toluene 76 2 5 " <br /> Xylenes(total) 140 2 5 <br /> .Surrogate Dtbromofluoromethane 121% 84-122 " <br /> Surrogate 1,2-Drchloroethane-d4 108% 74-135 " <br /> urragate Toluene-d8 103% 84-119 <br /> rrogate 4-Bromoluorobenzene 111% 86-119 <br /> VW-11(P409397-17)Water Sampled 09/2010413 46 Received 09/22/04 15 10 <br /> Tert-amyl methyl ether ND I 0 ugA 1 4090752 09/30/04 09/30/04 EPA 8260B <br /> Benzene 27 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane 53 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene 32 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether 063 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) 13 050 " <br /> Surrogate Dibromofluoromethane 120% 84-112 <br /> Surrogate 1,2-Drchloroethane-d4 115% 74-135 " <br /> Surrogate Toluene-d8 107% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 113% 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 /> This analytical report must be reproduced rn its entirety <br /> Page 14 of 29 <br />