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1455 McDowell Blvd North Ste D <br /> 15) (707)Sequoia Petaluma CA 94954 <br /> 792-1865 <br /> FAX(707)792-0342 <br /> Analytical www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P406422 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 07/15/04 10 23 <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-1 (P406422-07)Water Sampled 06/22/04 06 17 Received 06/22/04 12 15 <br /> Tert-amyl methyl ether ND 2000 ug/l 2000 4070035 07/02/04 07/02/04 EPA 8260B <br /> Benzene 32000 1000 <br /> Tert-butyl alcohol ND 40000 <br /> Di-isopropyl ether ND 2000 <br /> 1,2-Dibromoethane(EDB) ND 1000 " <br /> 1,2-Dtchloroethane 2000 1000 " <br /> Ethanol ND 200000 <br /> Ethylbenzene ND 1000 " <br /> Ethyl tert-butyl ether ND 2000 " <br /> Methyl tert-butyl ether ND 1000 <br /> Toluene 25000 1000 <br /> Xylenes(total) 18000 1000 <br /> Surrogate Dibromofluoromethane 95% 84-122 " <br /> gate 12-Dichloroethane-d4 88% 74-135 11 " <br /> gate Toluene-d8 101 % 84-119 <br /> Surrogate 4-Bromofluorobenzene 102% 86-119 <br /> VW-2(P406422-08)Water Sampled 06/22/04 05 52 Received 06/22/04 12 15 <br /> Tert-amyl mcthyl ether ND 500 ug/l 500 4070035 07/02/04 07/02/04 EPA 8260B <br /> Benzene 9000 250 " <br /> Tert-butyl alcohol ND 10000 " <br /> Di-isopropyl ether ND 500 <br /> 1,2-Dibromoethane(EDB) ND 250 " <br /> 1,2-Dichloroethane ND 250 <br /> Ethanol ND 50000 " <br /> Ethylbenzene 310 250 " <br /> Ethyl tert-butyl ether ND 500 <br /> Methyl tert-butyl ether ND 250 <br /> Toluene 3500 250 <br /> Xylenes(total) 5400 250 " <br /> Surrogate Dibromofluoromethane 97% 84-122 " <br /> Surrogate 1,2-Dtchloroethane-d4 91 % 74-135 <br /> Surrogate Toluene-d8 103% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 104% 86-119 11 " <br /> uola Analytical -Petaluma The results in this report apply to the samples analyzed in accordance wish the chain of <br /> custody document Unless otherwise stated, results are reported on a wet weigh!basis <br /> This analytical report must be reproduced in its entirety <br /> Page 8 of 18 <br />