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885 Jarvis Drive <br /> eq ll E a Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> mw Analytical wFAX(408)782.6308 <br /> ww.sequoielabsxom <br /> i' URS Corporation[Arco 1I Project: ARCO 40548,Stockton,Ca IvINH0053 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: NIP Reported: <br /> ' Sacramento CA,95833 Project Manager: Vernon P.Elarth 08/06/04 16:20 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Morgan Hill <br /> Reporting <br /> Analyte Resell limit Units Dilution Batch Prepared Analyzed Method Note <br /> VW-1(MNH0053-07)Water Sampled:08/03/04 09:35 Received: 08/04/04 09:30 <br /> tert-Amyl methyl ether ND 5.0 ug/1 10 4HO5021 08/05/04 08/05/04 EPA 8260E <br /> Benzene 230 5.0 <br /> tert-Butyl alcohol 210 200 <br /> Di-isopropyl ether ND 5.0 <br /> 1,2-Dichloroethane ND 5.0 " <br /> Ethanol ND 1000 " <br /> Ethyl tent-butyl ether ND 5.0 <br /> Ethylbenzene 330 5.0 " <br /> Methyl tent-butyl ether 280 5.0 " <br /> ' Toluene ND 5.0 <br /> Xylenes(total) 370 5.0 <br /> Gasoline Range Organics(C4-C12) 3600 500 <br /> 19 Surrogate: 1,2-Dichloroethane-d4 97% 78-129 " <br /> VW-2(MNH0053-08)Water Sampled: 08/03104 10:30 Received: 08/04/04 09:30 <br /> tert-Amyl methyl ether ND 0.50 ug/1 1 4HO5021 08/05/04 08/05/04 EPA 8260B <br /> Benzene 3.9 0.50 <br /> tert-Butyl alcohol 41 20 " <br /> Di-isopropyl ether ND 0.50 " <br /> 1,2-Dichloroethane 47 0.50 <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 0.50 <br /> Ethylbenzene 12 0.50 " <br /> ' Methyl tert-butyl ether 2.4 0.50 <br /> Toluene ND 0.50 " <br /> Xylenes(total) 1.1 0.50 <br /> Gasoline Range Organics(C4-C12) 600 50 " <br /> ' Surrogate: 1,2-Dichloroethane-d4 88% 78-129 " <br /> 1 <br /> I <br /> equoia Analytical-Morgan Hill 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 6 of 16 <br />