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al <br /> 1455 McDowell Blvd,North Ste D <br /> 4D Sequoia Petaluma,CA 94954 <br /> (707)792 1865 <br /> IW Analytical FAX(707)792-0342 <br /> Iswww sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P403188 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/12/04 10 17 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1 (P403188-11)Water Sampled 03/09/04 04 26 Received 03/10/04 08 00 <br /> Tetrachloroethene 37 050 ug/1 1 4030563 03/19/04 03/20/04 EPA 826013 <br /> Trichloroethene 3 4 050 " <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 0 50 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl text-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluorom ethane 109% 84-122 " <br /> Ourrogate 1 2-Dichloroethane-d4 109% 74-135 <br /> rrogate Toluene-d8 100% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 101 % 86-119 " <br /> MW-2(P403188-12)Water Sampled 03/09/04 07 28 Received 03/10/04 08 00 <br /> Tetrachloruethene 17 050 ug/l 1 4030563 03/19/04 03/20/04 EPA 8260B <br /> Trichloroethene 0 56 050 " <br /> Tert-amyl methyl ether ND 10 " <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane 2 9 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromelhane 112% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 110% 74-135 ^ <br /> Surrogate Toluene-d8 99% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 102% 86-119 " <br /> report Sequoia Analytical-Petaluma The results in this epo t 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 he reproduced to its entirety <br /> Page 16 of 34 <br />