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15) <br /> 1455 McDowell Blvd North Ste D <br /> SequoSePetaluma CA 94954 <br /> ia (707)792 1865 <br /> FAX(707)792 0342 <br /> Analytical www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P406422 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 07/15/04 10 23 <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 /> Domestic Well(P406422-11)Water Sampled 06/22/04 06 34 Received 06/22/04 12 15 <br /> Tert-amyl methyl ether ND 10 ug/I 1 4070035 07/02/04 07/02/04 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 050 " <br /> 1,2-Dichloroethane ND 050 <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 050 " <br /> Surrogate Dibromofluoromethane 101 % 84-122 " <br /> gate 12-Dichloroethane-d4 104% 74-135 <br /> lgate <br /> Toluene-d8 101 % 84-119 " <br /> Surrogate 4-Bromofluorobenzene 105% 86-119 " <br /> uola 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 10 of 18 <br />