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Sequoia 885 Jarvis Drive <br /> Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> ,Analytical VAX(408)782-6308 <br /> www.scquoialabs.com <br /> URS Corporation(Arco 1 j Project:ARCO#2130,Stockton,CA M0I0544 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Nutnber:GOBZK-0002 Reported: <br /> Sacramento;CA,95833 - Project Manager:Vemon P.Elarth 09/29/05 14:23 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> VW4(MOI0544-11)Water Sampled:09/11/0513:55 Received:09/14/0508.55 <br /> tert-Amyl methyl ether ND 0.50 ugll 1 5I22001 09/22/05 09/22/05 EPA 82608 <br /> Benzene ND 0.50 " <br /> tert-Butyl alc6hol ND 20 1 " <br /> Di-isopropyl ether ND 0.50 " <br /> 1,2-Dichlorotithane 1.1 0.50 " <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 0.54 " <br /> Ethylbenzene ND 0.50 " <br /> i <br /> Methyl tert-butyl ether ND 4.50 . <br /> Toluene ND 0.54 " <br /> Xylenes(total) ND 0.50 " <br /> Gasoline Range Organics(C4-C12) 210 50 PV <br /> Surrogate:1,2-Dichloroethane-d4 80% 60-135 " <br /> VW-5(M0I0544-12)Water Sampled:09/11/05 08:25 Received:09/14/05 08:55 <br /> tert-Amyl methyl ether ND 1.0 ug/l 2 5123007 09/23/05 09/23/05 EPA 8260B <br /> Benzene 2.0 1.0 " <br /> Cert-Butyl alcohol ND 40 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dichloroethane 110 1.0 " <br /> Ethanol ND 200 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Ethylbenzene ND 1.0 " <br /> Methyl tert-butyl ether 3.1 1.4 " <br /> Toluene ND 1.0 <br /> Xylenes(total) ND 1,0 " <br /> Gasoline Range Organics(C4-C12) ND 100 " <br /> Surrogate:I,2-Dichloroethane-d4 79% 60-135 " <br /> iF <br /> Sequoia Analytical-Morgan bill The results in this report apply to the samples analyzed in accordance with the chain of <br /> f 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 25 <br /> ii <br />