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(D (707) <br /> ' 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> 792 1865 <br /> ft—uffAnalytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P403414 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 04/01/04 16 41 <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 /> VW-3(P403414-03)Water Sampled 03/16/04 06 09 Received 03/17/0410 00 <br /> Tert-amyl methyl ether ND t00 ug/1 100 4030800 03/27/04 03/27/04 EPA 82608 <br /> Benzene 3100 50 " <br /> Ter-butyl alcohol ND 2000 " <br /> Di-isopropyl ether ND 100 " <br /> 1,2-Dibromoethane(EDB) ND 50 <br /> 1,2-Dichloroethane ND 50 " <br /> Ethanol ND 10000 " <br /> Ethylbenzene ND 50 " <br /> Ethyl tert-butyl ether ND 100 " <br /> Methyl tert-butyl ether 180 50 " <br /> Toluene 870 50 " <br /> Xylenes (total) 3600 50 " <br /> Surrogate Dibromofluoromethane 101 % 84-122 " <br /> gate 1 2-Dichloroethane-d4 106% 74-135 <br /> rugate Toluene-d8 105% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 101 % 86-119 " <br /> VW-5(P403414-04)Water Sampled 03/16/04 05 39 Received 03/17/04 10 00 <br /> Tert-amyl methyl ether ND 1 0 u9A 1 4030800 03/27/04 03/27/04 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dtchloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoramethane 99% 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 103% 74-135 " <br /> Surrogate Toluene-d8 103% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 101 % 86-119 " <br /> oia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 5 of 10 <br />