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Sequoia 1455McDowell Blvd North Ste <br /> Petaluma,CA 94949 544 <br /> 4D (707)792-1865 <br /> � ► Analytical FAX(707)792-0342 <br /> www sequrnalabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 [reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/04 14 29 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyle Result t,imt Umts Dilution Batch Prepared Analyzed Method Note <br /> MS-2B(P409397-22)Water Sampled 09/20/04 11 24 Received 09/22/04 15 10 <br /> Tert-amyl methyl ether ND 10 ugll 1 4090752 09/30/04 09/30/04 EPA 82608 <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 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 124% 84-122 LH <br /> Surrogate 1,2-Dichloroethane-d4 112% 74-135 " <br /> 0rrogate Toluene-d8 102% 84-119 <br /> rrogate 4-Bromofluorobemene 118% 86-119 " <br /> i <br /> MS-3A(P409397-23)Water Sampled 09/20/0412 15 Received 09/22/04 15 10 <br /> Tert-amyi methyl ether ND 10 ugll 1 4100058 10/04/04 10/04/04 EPA 8260B <br /> Benzene 19 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane 050 0 50 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 19 050 " <br /> Toluene 13 050 <br /> Xylenes(total) 066 050 " <br /> Surrogate Dibromofluoromethane 101% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 102% 74-135 " <br /> Surrogate Toluene-d8 114% 84-119 " <br /> Surrogate 4-Bromofluorobemene 112% 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 /> Thts analytical report must be reproduced in its entirety <br /> Page 17 of 29 <br />