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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792 1865 <br /> FAX Analytical wwseq(707)792-0342 <br /> om <br /> www sequo�alabs com <br /> s <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/I5/04 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/l 1 4070035 07/02/04 07/02/04 EPA 8260E <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibrornoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 0 50 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 101 % 84-122 " <br /> 0rogate 1 2-Dichloroethane-d4 104% 74-135 <br /> rogate 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 slated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 10 of 18 <br />