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a <br /> a— ) (707)1455 Mcbowell Blvd,North SteSequoia Petaluma,CA 4495444Analytical 792-1865 <br /> • FAX equo labs o 42 <br /> www sequoialabs oom <br /> URS Corp-Sacramento Project Arco Site 4493,Stockton,CA P406241 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-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-13D(P406241-02)Water Sampled 06/09/04 10 35 Received 06/10/04 06 25 <br /> Tert-amyl methyl ether ND 10 ugfl 1 4060456 06/21/04 06/21/04 EPA 8260E <br /> Benzene ND 10 11 <br /> " " " <br /> Tert-butyl alcohol ND 20 <br /> n-Butylbenzene ND to <br /> sec-Butylbenzene ND 10 <br /> tert-Butylbenzene ND 10 " <br /> Chloroform ND 10 <br /> Di-isopropyl ether ND 1 0 <br /> 1,2-Dibromoethane(EDB) ND 1 0 " <br /> 1,2-Dichloroethane ND 1 0 " n ^ <br /> l,1-Dichloroethene ND 10 " <br /> cis-1,2-Dichloroethene 12 10 " <br /> ans-1,2-Dichloroethene ND 10 <br /> !Ethanol ND t00 " <br /> Ethylbenzene ND 10 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Isopropylbenzene ND to " <br /> p-Isopropyltoluene ND 10 " <br /> Methyl tert-butyl ether ND 10 " <br /> Naphthalene ND 10 " <br /> n-Propylbenzene ND 10 " <br /> 1,1,2,2-Tetrachloroethane ND 10 <br /> Tetrachloroethene ND 10 " <br /> Toluene ND 10 " <br /> 1,1,2-Trichloroethane ND 10 " <br /> Trichloroethene ND 10 <br /> 1,3,5-Trimethylbenzene 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 Drbromofluoromethane 117% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 116% 74-135 " <br /> Surrogate Toluene-d8 115% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 111 % 86-119 " <br /> 0Sequoia 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 he reproduced in its entirety <br /> Page 7 of 36 <br />