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1455 McDowell Blvd,North Ste D <br /> Sequoia Fetalurm CA 94954 <br /> 4D (707)i792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> • <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P309471 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 11 59 <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-3(P309471-03)Water Sampled 09/23/03 07 55 Received 09/24/03 08 30 <br /> Tert-amyl methyl ether ND 10 ug/I 1 3100108 10/06/03 10/06/03 EPA 8260B <br /> Benzene ND 050 ^ <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 <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 107% 84-122 <br /> Surrogate 12-Dichloroethane-d4 117% 74-135 " <br /> Surrogate Toluene-d8 100% 84-119 " <br /> MW-4(P309471-04)Water Sampled 09/23/03 04 06 Received 09/24/03 08 30 <br /> ert-amyl methyl ether ND 1 0 ug/l 1 3100108 10/06/03 10/06/03 EPA 826013 <br /> Benzene ND 050 " <br /> Ten-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 <br /> Ethyl cert-butyl ether ND 10 " <br /> Methyl tent-butyl ether ND 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate DibromoJluoromethane 102% 84-112 " <br /> Surrogate 12-Dtchloroethane-d4 118% 74-135 " <br /> Surrogate Toluene-d8 96% 84-119 " <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 to its entirety <br /> Page 8 of 30 <br />