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1455 Mcbow Ste D <br /> Sequoia PeEalell Blvd NorthPetaluma CA 949544 <br /> a_�_ 4 <br /> Analytical (707)792- <br /> FAx(707)792-01865 342342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P503073 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50265 Reported <br /> Sacramento CA,95833 Protect Manager Vernon P Elarth 03/16/05 14 19 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Malyte Result Lima Units Dilution Batch Prepared Analyzed Method Nota <br /> ATR-9(P503073-09)Water Sampled 03/02/05 13 00 Received 03/03/05 10 35 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 5030147 03/14/05 03/14/05 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " ^ <br /> Di-isopropyl ether ND 1 0 <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 101 % 84-122 " <br /> Surrogate 1,2-Dichloroelhane-d4 102% 74-135 " <br /> �urrogate Toluene-d8 104% 84-119 <br /> Surrogate 4-Bromofluorobenzene 108% 86-119 <br /> ATR-10(P503073-10)Water Sampled 03/02/05 10 40 Received 03/03/05 10 35 <br /> Tert-amyl methyl ether ND 10 ug/l 1 5030140 03/14/05 03/14/05 EPA 8260B <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 105% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 107% 74-135 " <br /> Surrogate Toluene-d8 108% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 111 % 86-119 " <br /> Sequoia Analytical-Petaluma The results to 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 9 of 19 <br />