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1455 McDowell Blvd,Nordt Ste D <br /> 4D, Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792.4342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P309471 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-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 l,urut Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1 (P309471-01)Water Sampled 09/23/03 04 52 Received 09/24/03 08 30 <br /> Tert-amyl methyl ether ND 10 ag/l 1 3100108 10/06/03 10/06/03 EPA 82606 <br /> Benzene ND 0 50 <br /> Tert-butyl alcohol ND 20 " <br /> Dr-isopropyl ether ND 10 <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 94% 84-112 " <br /> Surrogate 12-Dichloroethane-d4 102% 74-135 " ~ <br /> Surrogate Toluene-d8 88% 84-119 <br /> MW-2(P309471-02)Water Sampled 09/23/03 06 50 Received 09/24/03 08 30 <br /> yl methyl methyl ether ND 1 0 ug/l 1 3100129 10/07/03 10/07/03 EPA 8260B <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 0 50 <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 94% 84-122 ~ <br /> Surrogate 12-Dichloroethane-d4 84% 74-135 " <br /> Surrogate Toluene-d8 102% 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 analyircal report must be reproduced in its entirety <br /> Page 7 of 30 <br />