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885 Jarvis Dr <br /> Sequoia M ren Hill,CA 95037 <br /> a— ) <br /> Analytical FAX(408)782-6308 <br /> www sequotalabs can <br /> URS Corporation I 3 Project ARCO#6020,Manteca,CA MMB0590 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO#6020,Manteca,CA Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 03/05/03 09 36 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Morgan Hill <br /> i <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-7 MMB0590-03 Water Sampled 02/17/03 13 55 Received 02/18/03 11 45 <br /> Ethanol ND 40 ug/i 1 3B27005 02/27/03 02/28/03 EPA 8260B <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 050 <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 <br /> I <br /> tent-Amyl methyl ether ND 050 <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dtbromoethane(EDB) ND 050 <br /> Benzene ND 050 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 <br /> Gasoline Range Organics(C6-C10) ND 50 " <br /> Surrogate 1 2-Dtchlaroethane-d4 110% 78-129 " <br /> MW-8 MMB0590-04 Water Sampled 02/17/03 14 30 Received 02/18/03 11 45 <br /> W..thanol ND 40 ug/l 1 3B27005 02/27/03 02/28/03 EPA 82608 <br /> rt-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 0 50 " <br /> Di-isopropyl ether ND 050 <br /> Ethyl tert-butyl ether ND 050 ^ <br /> tert-Amyl methyl ether ND 050 " <br /> 1,2-Dtchloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Benzene ND 050 " <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 <br /> Gasoline Range Organics(C6-C10) ND 50 <br /> Surrogate 1 2-Dtchloroelhane-d4 111 % 78-129 " <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 /> 4 of 8 <br />