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4D (70Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical FAX <br /> 7)792-1865 <br /> (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 lntnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/04 16 58 <br /> Volatile Orgamc Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> VW4(P312285-13)Water Sampled 12/10/03 05 13 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 10 ugll 1 3120686 12/24/03 12/24/03 EPA 8260B <br /> Benzene 20 050 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " ^ <br /> 1,2-Dichloroethane 12 050 <br /> Ethanol ND 100 <br /> Ethylbenzene 44 050 <br /> Ethyl tert-butyl ether ND 10 ^ <br /> Methyl tert-butyl ether ND 050 <br /> Toluene 22 050 ^ " <br /> Xylenes(total) 29 050 " <br /> Surrogate Dibromofluoromethane 102% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 98% 74-135 " <br /> urrogate Toluene-d8 103% 84-119 H " <br /> urrogate 4-BromoJluorobenzene 101 % 86-119 " <br /> VW-5(P312285-14)Water Sampled 12/10/03 02 31 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 10 u8A 1 3120702 12124103 12/24/03 EPA 8260B <br /> Benzene 12 050 " ^ <br /> I <br /> Tert-butyl alcohol ND 20 ^ " <br /> Di-isopropyl ether ND to ^ <br /> 1,2-Dichloroethane 48 050 <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 Drbromofluoromethane 108% 84-122 ~ <br /> Surrogate 1,2-Dichloroethane-d4 108% 74-135 " <br /> Surrogate Toluene-d8 102% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 104% 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 16 of 35 <br />