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vd <br /> Se D <br /> Sequoia 1455 McDow Pe�uma,CA 94t954 <br /> a— ) (797)792 1865 <br /> ► Analytical FAX(7©7)792-0342 <br /> www sequoialabs cont <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P312396 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number 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 /> Reposing <br /> Analyte Result Lim11 Units Dilution Batch Prepared Analyzed - Method Notes <br /> VW-2B(P312396-09)Water Sampled 12/11/03 05 10 Received 12/12/03 08 20 <br /> "Pert-amyl methyl ether ND 50 ugll 5 3120714 12/25/03 12/25/03 EPA 8260E <br /> Benzene ND 25 " <br /> Tert-butyl alcohol ND 100 ^ " <br /> Di-isopropyl ether ND 50 " <br /> 1,2-Drchloroethane 41 25 " <br /> Ethanol ND 500 ^ <br /> Ethylbenzene ND 25 ^ <br /> Ethyl tert-butyl ether ND 50 ^ <br /> Methyl tent-butyl ether 170 25 ^ ^ <br /> Toluene ND 25 " <br /> Xylenes(total) ND 25 ^ <br /> Surrogate Dibromofluoromethane 110% 84-121 " <br /> Surrogate 12-Drchloroethane-d4 113% 74-135 " <br /> Orrogate Toluene-d8 98% 84-119 " <br /> rrogate 4-Bromofluorobenzene 103% 86-119 <br /> VW-3B(P312396-10)Water Sampled 12/11/03 04 38 Received 12/12/03 08 20 <br /> Teri-amyl methyl ether ND 100 ug/l 100 3120714 1.2125103 12/25/03 EPA 8260B <br /> Benzene 1100. 50 <br /> Tert-butyl alcohol ND 2000 ^ <br /> Di-isopropyl ether ND 100 " <br /> 1,2-Dichloroethane ND 50 ^ <br /> Ethanol ND 10000 " <br /> Ethylbenzene 1100 50 <br /> Ethyl tert-butt'[ether ND 100 ^ <br /> Methyl tert-butyl ether 3500 50 ^ <br /> Toluene 930 50 ^ ^ <br /> Xylenes(total) 4300 50 ^ ^ <br /> Surrogate Drbromofluoromethane 101% 84-112 " <br /> Surrogate 12-Dichloroelhane-d4 105% 74-135 " <br /> Surrogate Toluene-d8 96% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 107% 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 /> Thrs analytical report must be reproduced in its entirely <br /> Page 9 of 17 <br />