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z <br /> �.� 1455 Mc Dowd <br /> Sequoia Petaluma CA 94954[Blvd North Ste 4 <br /> (707 792 1865 <br /> Analytical FAX(707) <br /> 792-0342342 <br /> . www sequoialabs cpm <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P312396 <br /> 2870 Gateway Oaks Drive Suite 300 Project Ntimber WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/09/04 18 12 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> ArtalYte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-6(P312396-06)Water Sampled 12/11/03 06 37 Received 12/12/03 08 20 <br /> Surrogate 4-Bromofluorobenzene 101%, 86-119 3120714 12/25/03 12125/03 EPA 8260B <br /> MW-7(P312396-07)Water Sampled 12/11103 06 56 Received 12/12/03 08 20 <br /> Tert-amyl methyl ether ND 10 ugA 1 3120714 12/25/03 12/25/03 EPA 8260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dtchloroethane 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) ND 050 <br /> Wurrogate <br /> Dibromofluoromethane 104% 84-122 " <br /> rogate 1 2-Dtchloroethane-d4 105% 74-135 " <br /> Surrogate Toluene-d8 91% 84-119 <br /> Surrogate 4-Bromofluorobenzene 98% 86-119 " <br /> VW-113(P312396-08)Water Sampled 12/11/03 05 30 Received 12/12/03 08 20 <br /> Tert-amyl methyl ether ND 10 ugtl 10 3120714 12/25/03 12/25/03 EPA 8260E <br /> Benzene ND 5 0 <br /> Tert-butyl alcohol ND 200 ^ " <br /> Di-isopropyl ether ND 10 ^ <br /> 1,2-Dtchloroethane ND 5 0 <br /> Ethanol ND 1000 <br /> Ethylbe-rizene ND 5 0 ^ <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl Cert-butyl ether 130 5 0 <br /> Toluene ND 5 0 <br /> Xylenes(total) ND 5 0 <br /> Surrogate Dibromofluoromethane 107% 84-122 " <br /> Surrogate 11-Drchloroethane-d4 106% 74-135 " <br /> Surrogate Toluene-d8 91% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 97% 86-119 " <br /> equoia 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 8 of 17 <br />