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.1 <br /> 1455 McDowell Blvd Noitb Ste D <br /> e D— Sequoia Petaluma,CA 94954(707)792 1665 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> I <br /> I <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P403188 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/12/0410 17 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result /,mut Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-3(P403188-13)Water Sampled 03/09/04 08 27 Received 03/10/04 08 00 <br /> Tetrachloroethene 14 050 ug/l 1 4030563 03/19/04 03/20/04 EPA 8260E <br /> Trichloroethene ND 050 " <br /> Tert-amyl methyl ether ND 10 " <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 112% 84-122 " <br /> 0urrrrogate 12-Dichloroethane-d4 117% 74-135 <br /> ogate Toluene-d8 100% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 108% 86-119 " <br /> MW4(P403188-14)Water Sampled 03/09/04 03 43 Received 03/10/04 08 00 <br /> Tetrachloroethene ND 050 ug/1 1 4030563 03/19/04 03/20/04 EPA 8260E <br /> TnchIoroethene ND 050 " <br /> Tert-amyl methyl ether ND 10 " <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> I,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromo luoromethane 112% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 120% 74-135 " <br /> Surrogate Toluene-d8 103% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 107% 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 weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 17 of 34 <br />