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1455 McDowell <br /> Blvd <br /> 5 <br /> Sequoia Petaluma CA 949(707)7921865 <br /> FAX(707)792-0342 <br /> Analytical www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P409117 <br /> 2870 Gateway Oaks Drive Suite 300 Project Ntunber 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 /> MW-12(P409117-03)Water Sampled 09/07/04 06 00 Received 09/07/04 16 55 <br /> Tert-amyl methyl ether ND 250 ug/l 250 4090417 09/16/04 09/16/04 EPA 82608 <br /> Benzene 9000 120 <br /> Tert-butyl alcohol ND 5000 <br /> Di-isopropyl ether ND 250 <br /> 1,2-Dibromoethane(EDB) ND 120 " <br /> 1,2-Dichloroethane ND 120 <br /> Ethanol ND 25000 " <br /> Ethylbenzene 1600 120 <br /> Ethyl tent-butyl ether ND 250 <br /> Methyl tert-butyl ether ND 120 " <br /> Xylenes(total) 11000 120 <br /> Surrogate Dibromofluoromethane 101 % 84-122 <br /> Surrogate 12-Dichloroethane-d4 102% 74-135 <br /> 4bogate Toluene-d8 104% 84-119 " <br /> ogate 4-Bromofluorobenzene 110% 86-119 <br /> MW-12(P409117-03RE1)Water Sampled 09/07/04 06 00 Received 09/07/04 16 55 <br /> Toluene 14000 500 ug/I 1000 4090458 09/18/04 09/18/04 EPA 8260E <br /> Surrogate Dibromofluoromethane 100% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 95% 74-135 <br /> Surrogate Toluene-d8 96% 84-119 <br /> Surrogate 4-Bromofluorobenzene 109% 86-119 " <br /> MW-13(P409117-04)Water Sampled 09/07/0405 29 Received 09/07/04 16 55 <br /> Tert-amyl methyl ether ND 5 0 ug/I 5 4090417 09/16/04 09/17/04 EPA 82608 <br /> Benzene <br /> 59 2 5 <br /> Tert-butyl alcohol ND 100 <br /> Di-isopropyl ether ND 5 0 <br /> 1,2-Dibromoethane(EDB) ND 25 " <br /> 1,2-Dichloroethane ND 25 " <br /> Ethanol ND 500 " <br /> Ethylbenzene ND 2 5 <br /> Ethyl tert-butyl ether ND 5 0 <br /> Methyl tert-butyl ether ND 25 <br /> Toluene ND 25 " <br /> Xylenes(total) 44 25 " <br /> Surrogate Dibromofluoromethane 97% 84-122 <br /> Surrogate 12-Dichloroethane-d4 96% 74-135 <br /> uola 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 in its entirety <br /> Page 6 of 15 <br />