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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequocalabs tom <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P402408 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03102/0410 16 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Litnit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-7(P402408-03)Water Sampled 02/16/04 14 00 Received 02/17/04 07 45 <br /> Tert-amyl methyl ether ND 1 0 ug/1 1 4020577 02/26/04 02126104 EPA 82608 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 98% 84-122 " <br /> urrogate 12-Dichloroethane-d4 101 % 74-135 " <br /> urrogate Toluene-d8 97% 84-119 <br /> Surrogate 4-BromoJluorobenzene 101 % 86-119 " <br /> MW-8(P401408-04)Water Sampled 02/16/04 13 05 Received 02/17/04 07 45 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 4020577 02/26/04 02/26/04 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tent-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate DtbromoJluoromethane 101 % 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 101 % 74-135 " <br /> Surrogate Toluene-d8 95% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 103 % 86-119 " <br /> Sequoia 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 werght basis <br /> This analytical report must be reproduced in its entirety <br /> Page 8 of 18 <br />