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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792 1865 <br /> Analytical FAX(707)792 0342 <br /> . www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P312630 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/13/04 17 22 <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-2(P312630-01)Water Sampled 12/23/03 04 16 Received 12/23/03 07 55 <br /> Tert-amyl methyl ether ND 1 0 ugh 1 4010016 01/05/04 01/05/04 EPA 8260E <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 104% 84-122 <br /> �rrogale 1,2-Dichloroethane-d4 107% 74-135 <br /> Surrogate Toluene-d8 91 % 84-119 <br /> Surrogate 4-BromoJluorobenzene 97% 86-119 <br /> VW-5(P312630-02)Water Sampled 12/23/03 04 05 Received 12123103 07 55 <br /> Tert-amyl methyl ether ND 1 0 ug/1 1 4010016 01/05/04 01/05/04 EPA 8260B <br /> Benzene 063 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(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 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) 058 050 " <br /> Surrogate DibromoJluoromethane 109% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 112% 74-135 <br /> Surrogate Toluene-d8 94% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 99% 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise staled results are reported on a wet weight <br /> basis This analytical report must be reproduced in its enirrety <br /> Page 4 of 9 <br />