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i <br /> 1455 McDowell Blvd,North Ste D <br /> 4D Sequoia Petah=ta,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P309471 <br /> 2870 Gateway Oaks Drive Smte 300 Project Number Intnm-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 Lntut Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-5(P309471-05)Water Sampled 09/23/03 05 56 Received 09/24/03 08 30 R-04 <br /> Tert-amyl methyl ether ND 50 ug/l 5 3100108 10/06/03 10/06/03 EPA 8260B <br /> Benzene ND 25 <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 50 " <br /> Ethanol ND 500 " <br /> Ethylbenzene ND 2 5 " <br /> Ethyl tert-butyl ether ND 50 " <br /> Methyl tert-butyl ether 60 25 " <br /> Toluene 25 25 " <br /> Xylenes(total) 11 2 5 ^ " <br /> Surrogate DibromoJluoromethane 104% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 118% 74-135 " <br /> Surrogate Toluene-d8 99% 84-119 " <br /> MW-6(P309471-06)Water Sampled 09/23/03 07 10 Received 09/24/03 08 30 <br /> ert-amyl methyl ether ND 10 ug/l 1 3100108 10/06/03 10/06/03 EPA 8260D <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 1 0 " <br /> Methyl tert-butyl ether ND 050 ^ <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 105% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 117% 74-135 " <br /> Surrogate Toluene-d8 99% 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 9 of 30 <br />