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Sequoia 1455 McDowell Blvd North ate D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> FAX��► Analytical ww.sg07}7abs.co2 <br /> www.sequoialabs.com <br /> is <br /> URS Corp-Sacramento Project:Arco Site 5450,Stockton,CA P503065 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:WR36604 Reported: <br /> Sacramento CA,95833 Project Manager:7efTBrooks 03/14/05 18:14 <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 /> MW-2(P503065-01)Water Sampled:03/01/05 11:30 Received:03/03/05 10:00 <br /> Tert-amyl methyl ether ND 1.0 ugll 1 5030114 03/10/05 03/10/05 EPA 8260E <br /> Benzene ND 0.50 <br /> Teri-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND I.0 <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tent-butyl ether 14 0.50 <br /> Toluene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 105% 84-122 " <br /> *Urr9 <br /> ogate: 1,2-Dichloroethane-d4 107% 74-135oate: Toluene-d8 108% 84-119 rrogale:4-Bromof'uorobenzene 109% 86-119 " <br /> MW-3(P503065-02)Water Sampled:0310110511:05 Received:03103/0510:00 <br /> Tert-amyl methyl ether ND 1.4 ug11 1 5030114 03/10/05 03/10/05 EPA 8260B <br /> Benzene ND 0.50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.4 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 0.50 <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 104% 84-122 " <br /> Surrogate:1,2-Dichloroethane-d4 109% 74-135 " <br /> Surrogate: Toluene-0 107% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 108% 86-119 " <br /> Sequoia 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 4 of 9 <br />