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Sequoia 1455MeDawP Blvd North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 j <br /> Analytical FAX(707)792-0342 <br /> vuwry sequoialabs com <br /> 0 <br /> I <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Prosect Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/04 14 29 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma � <br /> Reporting <br /> Analyte Result Irmlt Units Dilution Batch Prepared Analyzed Method Noie <br /> MS-1B(P409397-20)Water Sampled 09/20/04 1105 Received 09/22/04 15 10 <br /> Tert-amy]methyl ether ND 10 ugfl 1 4090752 09/30/04 09/30/04 EPA 8260B <br /> Benzene 3 9 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethy]benzene ND 030 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene 0 56 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 123% 84-122 LH <br /> Surrogate 1,2-Dichloroelhane-d4 112% 74-1350 " <br /> rrogate Toluene-d8 102% 84-119 'I <br /> rrogate 4-Bromofluorobenzene 109% 86-119 <br /> MS-2A(P409397-21)Water Sampled 09/20/04 11 30 Received 09/22/04 15 10 <br /> Tert-amyl methyl ether ND 10 ug/l l 4090752 09/30/04 09/30/04 EPA 8260B <br /> Benzene 070 050 <br /> TW-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dichloroethane 0 75 050 " <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 122% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 112% 74-135 " <br /> Surrogate Toluene-d8 102% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 110% 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 16 of 29 <br />