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885 Jarvis Drive <br /> Sequoia Morgan Hi11,CA 95037 <br /> (408)776.9600 <br /> Analytical <br /> FAX(408)762-6308 <br /> www.sequoialabs.com <br /> URS Corporation[Arco ll Project: ARCO#0548,Stockton,Ca MNH0053 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: N/P 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 Result limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-5(MNH0053-05)Water Sampled: 08/03/04 06:48 Received: 08/04/04 09:30 <br /> tert-Amyl methyl ether ND 0.50 ug/l 1 4H05021 08/05/04 08/05/04 EPA 8260E <br /> Benzene ND 0.50 " <br /> ' tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> `. <br /> Ethyl tert-but l ether ND 0.50 "Y Y <br /> Ethylbenzene ND 0.50 " <br /> Methyl tert-butyl ether 1.1 0.50 " <br /> Toluene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate: 1,2-Dichloroethane-d4 100% 78-129 <br /> MW-6(MNH0053-06)Water Sampled; 08/03/04 07:19 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 8260E <br /> ' Benzene ND 0.50 <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> ' Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> ' Methyl tert-butyl ether ND 0.50 <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Gasoline Range Organics(C4-02) 78 50 " <br /> Surrogate: 1,2-Dichloroethane-d4 87% 78-129Amok <br /> " <br /> 'I <br /> Sequoia 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 5 of 16 <br />