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Sequoia 1455 McDowell Blvd North Step <br /> Petaluma CA 94954 <br /> (70'7)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P503073 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/16/05 14 19 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method ]+lore <br /> ATR-I (P503073-01)Water Sampled 03/02/05 12 10 Received 03/03/05 10 35 <br /> Tert-amyl methyl ether ND 10 ug/I 1 5030155 03/15/05 03/15/05 EPA 82608 <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 <br /> Do-isopropyl ether ND 1 0 <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 1 0 <br /> Methyl teat-butyl ether ND 0 50 ^ " <br /> Toluene ND 050 ^ <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 112% 84-122 <br /> Surrogate 1,2-Dtchloroethane-d4 113% 74-135 " ^ <br /> urrogate Toluene-d8 100% 84-119 <br /> K <br /> „urrogate 4-Bromofluorobenzene 123% 86-119 LH <br /> ATR-2(P503073-02)Water Sampled 03/02/05 13 45 Received 03/03/05 10 35 <br /> Tert-amyl methyl ether ND 10 ugll 1 5030155 03/15/05 03/15/05 EPA 8260B <br /> Benzene ND 0 50 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 ^ <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dtchloroethane ND 050 ^ ^ <br /> Ethanol ND 100 ” <br /> Ethylbenzene ND 0 50 " ^ <br /> Ethyl tert-butyl ether ND 1 0 <br /> Methyl tert-butyl ether ND 050 " ^ <br /> Toluene ND 0 50 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 109% 84-122 " <br /> Surrogate 1,2-Dtchloroethane-d4 112% 74-135 <br /> Surrogate Toluene-d8 104% 84-119 ^ <br /> Surrogate 4-Bromofluorobenzene 112% 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chant of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> . This analytical report must be reproduced in its enirrety <br /> Page 5 of 19 <br /> i <br />