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Blvd, <br /> Sequoia 1455McDowell <br /> Petaluma, <br /> ,CA Ste 4 <br /> Petaluma,C9 91865 <br /> (707)792-1865 <br /> Analytical w 7)792-0342 <br /> wsvw.seqw.sequoi stabs.co m <br /> URS Corp-Sacramento Project:Arco Site 5450,Stockton,CA P411562 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:WR36604 Reported: <br /> Sacramento CA,95833 Project Manager:7eff Brooks 12/15/04 18:45 <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(P411562-01)Water Sampled: 11/22/0415:10 Received:11/24/04 13:50 <br /> Tert-amyl methyl ether ND 1.0 ugA 1 4120094 12/04/04 12/04/04 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 0.50 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether 21 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 <br /> Surrogate:Dibromofluoromelhane 114% 84-122 " <br /> urrogate: 1,2-Dichloroethane-d4 119% 74-135 11 <br /> urrogate: Toluene-d8 115% 84-119 <br /> Surrogate:4-Bromofluorobenzene 112% 86-119 " <br /> MW-3(P411562-02)Water Sampled: 1112210414:20 Received:11/24/04 13:50 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 4120094 12/04/04 12/04/04 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 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 113% 84-122 " <br /> Surrogate:1,2-Dichloroethane-d4 119% 74-135 " <br /> Surrogate: Toluene-d8 115% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 112% 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 /> i <br /> i <br />