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5 <br /> 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> ,�\,,,�\„��■,-�!,!! (707)792-1865 <br /> Analytical PAX(707)792-0342 <br /> www sequoialabs com <br /> is <br /> URS Corp-Sacramento ProJect Arco Site 6100,Tracy,CA P409117 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 [reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 09/21/04 09 47 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> VW-3(P409117-07)Water Sampled 09/07/04 04 17 Received 09/07/04 16 55 <br /> `Pert-amyl methyl ether ND 200 ug/1 200 4090417 09/16/04 09/17/04 EPA 8260E <br /> Benzene 4100 100 11 <br /> " " <br /> Tert-butyl alcohol ND 4000 11 " <br /> Di-Isopropyl ether ND 200 <br /> 1,2-Dibromoethane(EDB) ND 100 " <br /> 1,2-Dichloroethane 210 100 <br /> Ethanol ND 20000 <br /> Ethylbenzene 200 100 <br /> Ethyl tert-butyl ether ND 200 " <br /> Methyl tert-butyl ether 360 100 <br /> Toluene 2400 100 <br /> Xylenes(total) 4600 100 <br /> Surrogate Dibromofluoromethane 103% 84-122 <br /> ogate 1,2-Dichloroethane-d4 102% 74-135 <br /> ogate Toluene-d8 101 % 84-119 <br /> Surrogate 4-Bromofluorobenzene 109% 86-119 " <br /> VW-6(P409117-08)Water Sampled 09/07/04 04 56 Received 09/07/04 16 55 <br /> Tert-amyl methyl ether ND 500 ug/1 500 4090417 09/16/04 09/17/04 EPA 8260B <br /> Benzene 16000 250 1, <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 380 250 <br /> Ethyl tert-butyl ether ND 500 <br /> Methyl tert-butyl ether ND 250 " <br /> Toluene 1200 250 " <br /> Xylenes(total) 1100 250 " <br /> Surrogate Dibromofluorom ethane 97% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 95% 74-135 " <br /> Surrogate Toluene-d8 95% 84-119 IF " <br /> Surrogate 4-Bromofluorobenzene 10S% 86-119 11 " <br /> uoia Analytical-Petaluma The results to this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise staled results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 8 of 15 <br />