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1455 McDowell Blvd North Ste D <br /> 41) (707)Sequoia Petaluma CA 94954 <br /> 792 1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs coinom. <br /> • <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-3(P406422-09)Water Sampled 06/22/04 06 00 Received 06/22/04 12 15 <br /> Tert-amyl methyl ether ND 1000 ug/l 1000 4070035 07/02/04 07/02/04 EPA 8260B <br /> Benzene 22000 500 " <br /> Tert-butyl alcohol ND 20000 " <br /> Di-isopropyl ether ND 1000 <br /> 1,2-Dibromoethane(EDB) ND 504 <br /> 1,2-Dichloroethane ND 500 <br /> Ethanol ND 100000 " <br /> Ethylbenzene 880 500 " <br /> Ethyl tert-butyl ether ND 1000 " <br /> Methyl tert-butyl ether 970 500 " <br /> Toluene 22000 500 <br /> Xylenes(total) 12000 500 <br /> Surrogate Dibromofluoromethane 98% 84-122 <br /> ogate 12-Dichloroethane-d4 98% 74-135 <br /> gate Toluene-d8 100% 84-119 <br /> Surrogate 4-Bromofluorobenzene 105% 86-119 <br /> VW-4(P406422-10)Water Sampled 06/22/04 06 09 Received 06/22/04 12 15 <br /> Tert-amyl methyl ether ND 500 ug/l 500 4070035 07/02/04 07/02/04 EPA 8260B <br /> Benzene 9300 250 <br /> Tert-butyl alcohol ND 10000 <br /> Di-isopropyl ether ND 500 <br /> 1,2-Dibromoethane(EDB) ND 250 <br /> 1,2-Dichloroethane 960 250 <br /> Ethanol ND 50000 " <br /> Ethylbenzene 1600 250 <br /> Ethyl tert-butyl ether ND 500 " <br /> Methyl tent-butyl ether ND 250 " <br /> Toluene 10000 250 " <br /> Xylenes(total) 23000 250 " <br /> Surrogate Dibromofluoromethane 98% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 97% 74-135 <br /> Surrogate Toluene-d8 102% 84-119 <br /> Surrogate 4-Bromofluorobenzene 107% 86-119 <br /> uola Analytical - Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless olhenvise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 9 of 18 <br />