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`Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> +AnalytlCal (707)792- <br /> FAX(707)792-034342 <br /> 2 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project:Arco Site 2130,Stockton,CA P504010 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:GOBZK-0002 Reported: <br /> Sacramento CA,95833 Project ManagarNernon P.Elarth 04/13/05 09:46 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> k <br /> MS-1B(P504010-19)Water. Sampled:03/29/05 07:40 Received:03/30/05 11:50 B7,BU <br /> Tertamyl methyl ether ND 1.0 ug/l 1 5040080 04/08/05 04/08/05 EPA 82bOB <br /> Benzene 0.63 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 ND 0.50 <br /> Toluene ND 0.50 ^ ^ <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 104% 84-121 <br /> Surrogate:1,2-Dichloroethane-W. 106% 74-135 " <br /> Surrogate:Toluene-d8 100% 84-119 " <br /> surrogate:4-Bromofluorobenzene 112% 86-119 " <br /> MS-2A(P504010-20)Water Sampled:03/29/05 08:25 Received:03/30/05 11:50 <br /> Tert-amyl methyl ether ND 1.0 ug/1 1 5040080 04/08/05 04/08/05 EPA 8260E <br /> Benzene 0.61 0.50 " <br /> 'Pert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dichloroethane 0.83 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:Dibromofluoromethane. 106% 84-122 " <br /> Surrogate:'1,2-Dichloroethane-d4 115% 74-135 " <br /> Surrogate: Toluene-d8 97% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 108% 86-119' " <br /> Sequoia Analytreal-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 trust be reproduced in its entirety. <br /> Page 16 of 29 <br />