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• 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> r• Analytical <br /> 4D— (707)7921$65 FAX equo labs c 42 <br /> www sequolalabs wm <br /> URS Corp-Sacramento Project Arco Site 4493,Stockton,CA P406241 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntnm-50441 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/30/04 12 34 <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-13M(P406241-01)Water Sampled 06/09/04 10 10 Received 06/10/04 06 25 <br /> Tert-amyl methyl ether ND 10 ug/t 1 4060456 06/21/04 06/21/04 EPA 8260B <br /> Benzene ND 10 " <br /> Tert-butyl alcohol ND 20 " <br /> n-Butylbenzene ND 10 <br /> sec-Butylbenzene ND 10 " <br /> tert-Butylbenzene ND 10 " <br /> Chloroform ND 10 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 10 " <br /> 1,2-Dichloroethane ND 10 " <br /> 1,1-Dichloroethene ND 10 " <br /> cis-1,2-Dichloroethene 28 10 " <br /> trans-1,2-Dichloroethene ND 10 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 10 <br /> Ethyl tert-butyl ether ND 10 " <br /> Isopropylbenzene ND 10 " <br /> p-Isopropyltoluene ND 10 " <br /> Methyl tert-butyl ether ND 10 <br /> Naphthalene ND 10 " <br /> n-Propylbenzene ND 1 0 " <br /> 1,1,2,2-Tetrachloroethane ND 10 " <br /> Tetrachloroethene ND 10 " <br /> Toluene ND 10 " <br /> 1,1,2-Tnchloroethane ND 10 " <br /> Trichloroethene 19 10 " <br /> 1,3,5-Tnmethylbenzene ND 10 <br /> 1,2,4-Tnmethylbenzene ND 10 " <br /> Vinyl chloride ND 10 " <br /> m,p-Xylene ND 10 " <br /> o-Xylene ND 10 " <br /> Surrogate Dibromofluoromethane 115% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 116% 74-135 " " <br /> Surrogate Toluene-d8 115% 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 entirety <br /> Page 6 of 36 <br />