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1455 McDowell Blvd North Ste D <br /> (D S eq u o i a Petaluma,CA 94954 <br /> (707)792 1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs cam <br /> URS Corp-Sacramento Project Arco Site 434,Lodi,CA P310098 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim 50433 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/15/03 16 54 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Uruts Dilution Batch Prepared Analyzed Method Notes <br /> W-2A(P310098-03)Water Sampled 09/29/03 10 45 Received 09/30/03 16 01 R-05 <br /> Tert-amyl methyl ether ND 20 ugll 2 3100252 10/10/03 10/10/03 EPA 8260B <br /> Benzene 10 10 " ^ <br /> Tert-butyl alcohol ND 40 ^ <br /> Di-isopropyl ether ND 2 0 " <br /> 1,2-Dichloroethane ND 10 " <br /> Ethanol ND 200 ^ <br /> Ethylbenzene ND 1 0 " <br /> Ethyl tert-butyl ether ND 2 0 " <br /> Methyl tert-butyl ether 18 1 0 " <br /> Toluene ND 10 " <br /> Xylenes(total) 12 1 0 " ^ <br /> Surrogate Dibromofluoromethane 96% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 96% 74-135 " <br /> Surrogate Toluene-d8 88% 84-119 " <br /> W <br /> rrogate 4-Bromofluorobenzene 96% 86-119 " <br /> -28(P310098-04)Water Sampled 09/29/03 11 10 Received 09/30/03 16 01 <br /> Tert-amyl methyl ether ND 10 ug/1 1 3100252 10/10/03 10/10/03 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane 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 Dibromofluoromethane 97% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 96% 74-135 " <br /> Surrogate Toluene-d8 87% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 96% 86-119 " <br /> Sequoia Analytical-PetaIuma 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 5 of 10 <br />