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�.- - <br /> i <br /> W 11 <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P406178 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/30/04 13:08 <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-5(P406178-05)Water Sampled:06/08/04 09:00 Received:06/08/04 11:30 <br /> Tert-amyl methyl ether ND 25 ug/1 25 4060379 06/16/04 06/16/04 EPA 8260E <br /> Benzene ND 12 <br /> Tert-butyl alcohol ND 500 <br /> Di-isopropyl ether ND 25 " <br /> 1,2-Dibromoethane(EDB) ND 12 <br /> 1,2-Dichloroethane ND 12 <br /> Ethanol ND 2500 <br /> Ethylbenzene ND 12 " <br /> Ethyl tert-butyl ether ND 25 ^ <br /> Methyl tert-butyl ether 490 12 " ^ <br /> Toluene ND 12 <br /> Xylenes(total) ND 12 <br /> urrogate:Dibromofluoromethane 112% 84-121 <br /> urrogate:1,2-Dichloroethane-d4 109% 74-135 <br /> Surrogate: Toluene-d8 110% 84-119 <br /> Surrogate:4-Bromojluorobenzene 106% 86-119 ^ <br /> MWfi(P406178-06)Water Sampled:06/08/04 08:22 Received:06/08/04 11:30 <br /> Tert-amyl methyl ether ND 1000 Ug/1 1000 4060423 06/18/04 06/18104 EPA 8260B <br /> Benzene ND 500 11 ^ <br /> Tert-butyl alcohol ND 20000 " <br /> Di-isopropyl ether ND 1000 " ^ <br /> 1,2-Dibromoethane(EDB) ND 500 ^ <br /> 1,2-Dichloroethane ND 500 <br /> Ethanol ND 100000 <br /> Ethylbenzene ND 500 ^ <br /> Ethyl tent-butyl ether ND 1000 ^ ^ <br /> Methyl tert-butyl ether 15000 500 ^ ^ <br /> Toluene ND 500 <br /> Xylenes(total) ND 500 " <br /> Surrogate:Dibromofluoromethane 108% 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 I15% 74-135 " ^ <br /> Surrogate:Toluene-d8 105% 84-119 <br /> Surrogate:4-Bromofluorobenzene 103% 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the <br /> chain of custody document. Unless otherwise stated,results are reported on a wet <br /> weight basis. This analytical report must be reproduced in its entirety. <br /> Page 9 of 37 <br /> if <br /> G <br />