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1455 McDowell Blvd North Ste DSequoia Petalurna,CA94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> . www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P406360 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 07 39 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Umts Dilution Batch Prepared Analyzed Method Not <br /> MW-3(P406360-03)Water Sampled 06/17/04 07 02 Received 06/17/0411 50 <br /> Tert-amyl methyl ether ND 10 ugll 1 4060627 06/29/04 06/29/04 EPA 826013 <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 0 50 <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 Ill% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 123% 74-135 " <br /> Wurrogale Toluene-d8 102% 84-119 <br /> rogate 4-Bromofluorobenzene 110% 86-119 <br /> MW4(P406360-04)Water Sampled 06/17/04 08 41 Received 06/17/04 11 50 <br /> Tert-amyl methyl ether ND 500 ugA 500 4060627 06/29/04 06129104 EPA 8260B <br /> Benzene ND 250 " <br /> Tert-butyl alcohol ND 10000 " <br /> Di-isopropyl ether ND 500 <br /> 1,2-Dichloroethane ND 250 <br /> Ethanol ND 50000 " <br /> Ethylbenzene ND 250 " <br /> Ethyl tert-butyl ether ND 500 <br /> Methyl tert-butyl ether 10000 250 " <br /> Toluene ND 250 <br /> Xylenes(total) ND 250 <br /> Surrogate Dibromofluoromethane 112% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 122% 74-135 " <br /> Surrogate Toluene-d8 103% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 111% 86-119 " <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 in its entirety <br /> Page 8 of 21 <br />