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SequoSequoia 1455 McDowell Blvd,North Ste D <br /> ia Petaluma,CA 94954 <br /> Analytical (707)792-t 865 <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 <br /> J g 0613010413:0$ <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-3(P406178-03)Water Sampled.:06/08/04 07:36 Received:06/08/04 11:30 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 4060379 06/16/04 06/16/04 EPA 8260B <br /> Benzene ND 0.50 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1.0 <br /> 1,2-Dibrotnoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0.50 <br /> Ethyl tent-butyl ether ND 1.0 <br /> Methyl tert-butyl ether 1.8 0.50 <br /> Toluene ND 0.50 <br /> Xylenes(total) ND 0.50 <br /> urrogate:Dibromofluoromethane 114% 84-122 <br /> IlWrrogale:1,2-Dichloroethane-d4 116% 74-135 " <br /> Surrogate:Toluene-d8 111% 84-119 " " " „ <br /> Surrogate:4-Bromofluorobenzene 105% 86-119 <br /> MW-4(P406178-04)Water Sampled:06/08/04 09:50 Received:06/08/04 11:30 <br /> Tert-amyl methyl ether ND 1000 u8/l 1000 4060379 06/16/04 06/16/04 EPA 8260E <br /> Benzene 1900 500 <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 tert-butyl ether ND 1000 " <br /> Methyl tert-butyl ether 23000 500 <br /> Toluene ND 500 " <br /> Xylenes(total) ND 500 <br /> Surrogate:Dibromofluoromethane 111% 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 110% 74-135 <br /> Surrogate:Toluene-d8 110% 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 <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 entirely. <br /> Page 8 of 37 <br />