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Sequoia 1455 McDowell Blvd North Ste D <br /> Petaluma,CA94954 <br /> 79 <br /> (707)792 1865 <br /> mW Analytical www squoiFAXequoi 792-0342 <br /> alabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P409398 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number intrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/05/04 15 26 <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 /> ATR-5(P409398-01)Water Sampled 09/20/04 13 50 Received 09122/0415 10 <br /> Tert-amyl methyl ether ND 10 ug/l 1 4100058 10/04/04 10/04/04 EPA 82605 <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 54 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 100% 84-122 " <br /> rrogate 1,2-Dichloroethane-d4 100% 74-135 <br /> rrogate Toluene-d8 113% 84-119 <br /> Surrogate 4-Bromo,Jluorobenzene 112% 86-119 <br /> ATR-8(P409398-02)Water Sampled 09/20/04 13 20 Received 09/22/04 15 10 <br /> Tert-amyl methyl ether ND 10 ug/1 1 4100058 10/04/04 10/04/04 EPA 8260E <br /> Benzene ND 0 50 <br /> Tert-butyl alcohol ND 20 " <br /> Dt-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 19 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromelhane 104% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 104% 74-135 " <br /> Surrogate Toluene-d8 111% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 115% 86-119 " <br /> Sequoia 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 4 of 8 <br />