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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA94954 <br /> (707)79792-1865 <br /> FAX Analytical wwseq(707)792-0342342 <br /> • www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrtm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vemon P Elarth 10/06/04 14 29 <br /> Volatile Organic Compounds by EPA Method 8260E <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result limit Units Dilution Batch Prepared Analyzed Method Nde <br /> MW-7(P409397-07)Water Sampled 09/20/04 09 20 Received 09/22/04 15 10 <br /> Tert-amyl methyl ether ND 10 ug/l 1 4090738 09/29/04 09/29/04 EPA 8260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 <br /> DI-isopropyl ether ND 10 <br /> 1,2-Dichloroethane ND 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 Dibromofluoromethane 94010 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 95% 74-135 " <br /> 0urrogate Toluene-d8 94% 84-119 <br /> rrogate 4-Bromofluorobenzene 86% 86-119 <br /> VW-1 (P409397-09)Water Sampled 09/20/04 15 10 Received 09/22/04 15 10 <br /> Tert-amyl methyl ether ND 50 ugtl 50 4090738 09/29/04 09/29/04 EPA 8260B <br /> Benzene ND 25 <br /> 'Pert-butyl alcohol ND 1000 " <br /> Di-isopropyl ether ND SO <br /> 1,2-Dichloroethane ND 25 " <br /> Ethanol ND 5000 " <br /> Ethylbcnzene 110 25 " <br /> Ethyl tert-butyl ether ND 50 <br /> Methyl tert-butyl ether 27 25 " <br /> Toluene ND 25 <br /> Xylenes(total) 570 25 " <br /> Surrogate Dibromofluoromethane 94% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 95% 74-135 " <br /> Surrogate Toluene-d8 93% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 87% 86-119 " <br /> Sequola 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 in its entirety <br /> Page 10 of 29 <br />