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mF F - <br /> Set"uoa 1455 McDowell <br /> PetalumaNCorth Ste A 94954 <br /> A (707)792-1865 <br /> �'a. ' L�n'a" li_C a FAX(707)792-0342 <br /> www.sequoialabs.com <br /> i <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P406I78 <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 Analyzrd Method Notes <br /> MW-8(P406178-08RE1)Water Sampled:06108/0406:11 Received:06/08/04 11:30 <br /> Methyl tert-butyl ether 32000 500 ugll 1000 4060448 06/21/04 06/21/04 EPA 8260B <br /> Surrogate:Dibromofluoromethane 117% 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 130% 74-135 " <br /> Surrogate: Toluene-d8 102% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 96% 86-119 <br /> MW-9(P406178-09)Water Sampled:06/08/04 05:31 Received:06/08/04 11:30 <br /> Tert-amyl methyl ether ND 1.0 ug/1 l 4060423 06/18/04 06/18/04 EPA 8260B <br /> Benzene ND 0.50 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether 1.1 1.0 <br /> 1,2-Dibromoethane(EDB) ND 0.50 <br /> 2-Dichloroethane 5.3 0.50 " <br /> 'thanol ND 100 <br /> Ethylbenzene ND 0.50 <br /> Ethyl tert-butyl ether ND 1.0 <br /> Methyl tert-butyl ether 4.2 0.50 <br /> Toluene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> Surrogate Dibromofluoromethane 108% 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 111 % 74-135 <br /> Surrogate: Toluene-d8 103% 84-719 " <br /> Surrogate:4-Bromofluorobenzene 103% 86-119 <br /> MW-10(P406178-10)Water Sampled:06108/0406:26 Received:0610810411:30 <br /> Tert-amyl methyl ether ND 1.0 ugA 1 4060456 06/21/04 06/21/04 EPA 8260E <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 1.1 0.50 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Toluene ND 0.50 <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 I I of 37 <br />