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885 Jarvis <br /> Drive <br /> Sequoia Morgans 95037 <br /> 7 (400 77B)776-9600 <br /> FAX(408)782-6308 <br /> Analytical www scquoialabs com <br /> URS Corporation lArcol) Project ARCO 46020,Manteca,CA MNH0330 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number NIP Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 09/16/04 12 03 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Morgan Hill <br /> Reporting <br /> Analyte Result Lint Units Dilution Batch Prepared Analyzed Method Note <br /> MW-7(MNH0330-03)Water Sampled 08/05/04 10 00 Received 08/10/04 09 30 <br /> tert-Amyl methyl ether ND 050 ug/l 1 41319001 08/19/04 08/19/04 EPA 8260B <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0 50 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dtchloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 0 50 " <br /> Methyl tert-butyl ether ND 0 50 <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 1,2-Dtchloroethane-d4 84% 78-129 " <br /> W-8(MNH0330-04)Water Sampled 08/05/041125 Received 08/10/04 09 30 <br /> 'Wert-Amyl methyl ether ND 050 ug/l I 4HI8002 08/18/04 081]8104 EPA 8260B <br /> Benzene ND 0 50 " <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dlbromoethane(EDB) ND 050 " <br /> 1,2-Dtchloroethane ND 0 50 " <br /> Ethanol ND 100 " " 1C <br /> Ethyl tert-butyl ether ND 050 <br /> Ethylbenzene ND 0 50 <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 1,2-Dtchloroethane-d4 85% 78-129 " <br /> Sequoia Analytical -Morgan Hill The results to this report apply 10 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 entrrety <br /> Page 6 of 18 <br />