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North <br /> Sequoia 1455McDowell <br /> Petaluma, <br /> 4 <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> a— ) <br /> Analytical FAX(707)792-0342 <br /> www'sepuo:alabs.com <br /> URS Corp-Sacramento Project:Arco Site 5450,Stockton,CA P409110 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:WR36604 Reported: <br /> Sacramento CA,95833 Project ManagerIeff Brooks 09/16/04 15:54 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result limit Units Dilution Batch Prepared Analysed Method Note <br /> MW-2(P409110-01)Water Sampled:08131/0415:25 Received:09/03/04 14:30 <br /> Tert-amyl methyl ether ND 1.0 ugfl 1 4090279 09/14/04 09/14/04 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 2.6 0.50 " <br /> Toluene ND 0.50 ^ <br /> Xylenes(total) 0.52 0.50 " <br /> Surrogate:Dibromofluoromethane 104% 84-122 " <br /> Surrogate: 1,2-Dichloroelhane-d4 104% 74-135 " <br /> .Surrogate: Toluene-d8 108% 84-119 " <br /> Surrogate:4-Bromofluorobenaene 111% 86-119 " <br /> MW-3(P409110-02)Water Sampled:08131/0414:45 Received:0910310414:30 <br /> Tert-amyl methyl ether ND 1.0 ugA 1 4090279 09/14/04 09/14/04 EPA 9260B <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 107% 84-122 " <br /> Surrogate:1,2-Dichloroethane-d4 106% 74-135 " <br /> Surrogate: Toluene-d8 107% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 114% 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 />