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a- Petaluma,(707) <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> CA 94954 <br /> 792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/04 16 58 <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 /> MS-3A(P312285-24)Water Sampled 12/10/03 06 12 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 1 0 ug/1 1 3120709 12/24/03 12/24/03 EPA 8260B <br /> Benzene 19 050 " " +1 ^ <br /> Tert-butyl alcohol ND 20 " " " ^ It n <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dichloroethane 13 050 <br /> Ethanol ND 100 <br /> Ethylhenzene 42 050 ^ " <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether 058 050 ^ <br /> Toluene 22 050 <br /> Xylenes(total) 27 050 <br /> Surrogate Dibromofluaromethane 99% 84-122 " ^ <br /> Surrogate 1 2-Dtchloroethane-d4 108% 74-135 <br /> Surrogate Toluene-d8 99% 84-119 ^ ^ <br /> urrogate 4-Bromofluorobenzene 106% 86-119 <br /> MS-3D(P312285-25)Water Sampled 12/10/03 06 26 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 3120709 12/24/03 12/24/03 EPA 8260B <br /> Benzene 26 050 ^ ^ <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 <br /> 1,2-Dichloroethane 14 050 <br /> Ethanol ND 100 ^ " <br /> Ethylbenzene 5 9 050 <br /> Ethyl tent-butyl ether ND 10 <br /> Methyl tert-butyl ether 0 63 0 50 ^ ^ <br /> Toluene 30 050 <br /> Xylenes(total) 37 050 <br /> Surrogate Dibromofluoromethane 105% 84-122 <br /> Surrogate 1,1-Dichloroethane-d4 115% 74-135 " <br /> Surrogate Toluene-d8 103% 84-119 <br /> Surrogate 4-Bromofluorobenzene 101% 86-119 " ^ <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 22 of 35 <br />