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Sequo' 1455 McDowell Blvd,North Ste D <br /> ia Petaluma,CA 94954 <br /> +. i (707)792-1865 <br /> .Analytical FAX(707)792-0342 <br /> www,sequoialabs.com <br /> C) <br /> 4 <br /> URS Corp-Sacramento Project:Arco Site 2130,Stockton,CA P504010 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number.GOBM-0002 Reported: <br /> Sacramento CA,95833 Project Manager:Vernon P.Elarth 04/13/05 09:46 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma . <br /> Reporting <br /> Analyte Result Lirnit Units Dilution Batch Prepared Analyzed Method Now <br /> MW-3(P504010-03)Water`` Sampled:0312810511:35 Received:03/30/05 11:50 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 5040050 04/06/05 04/06/05 EPA 82608 <br /> Benzene ND 0.50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 1. " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene. ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromeihane. 105% 84-122 " <br /> Surrogate:1,2-Dichloroethane-d4 .104% 74-135 " <br /> Surrogaw.Toiuene-d8 101 % 84-119C <br /> Surrogate:4-Bromofluorobenzene 106% 86-119 " <br /> MW4(P504010-04)Water. Sampled:03/28/05 12:00 Received:03/30/05 11:50 <br /> Tert-amyl methyl ether ND 1.0 ug/I 1 5040050 04/06/05 04/06/05 EPA 8260B <br /> Benzene ND 0.50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether 1.7 0.50 " <br /> Toluene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 101 % 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 101 % 74-135 " <br /> Surrogate:Toluene-d8 95% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 100% 86-119 <br /> Sequoia Analytical-Petaluma 77te resulfs 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 entirely. <br /> Page 8 of 29 <br /> =S <br /> 1 <br />