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=Sequoia 985 Jarvis Drive <br /> i r Morgan Hill,CA 95037 <br /> Analytical FAX(408)772-9600 <br /> (408)782-6308 <br /> .. www.sequoialabs.com <br /> URS Corporation[Arco]] Project:ARCO#2130,Stockton,CA M010544 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:G0BZK-0002 [reported: <br /> Sacramento CA,95833 Project ManagevVernon P.Elarth 09/29/05 14:23 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Morgan Dill <br /> Reporting <br /> Analyte , Result limit units Dilution Batch Prepared Analyzed Method Note,- <br /> MS-1B(M014544-19)Water Sampled:09/12/05 09:55 Received:09/14/05 08:55 <br /> tent-Amyl methyl ether ND 0.50 uSA 1 5I22020 09/22/05 09/22/05 EPA 8260B <br /> Benzene 3.1 0.50 <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 0.50 <br /> 1,2-Dichloroethane ND 0.54 <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 0.50 <br /> Ethylbenzene 0.76 0.50 " <br /> Methyl ter[-butyl ether ND 0.50 <br /> Toluene 3.0 0.50 " <br /> Xylenes(total) 3.7 0.50 <br /> Gasoline Range Organics(C4-02) 290 50 " " PV <br /> Surrogate:1,2-Dichloroethane-d4 80% 60-135 " <br /> ..MS-2A(MO10544-20)Water Sampled:0917710512:40 Received:09/14/05 08:55 <br /> rt-Amyl methyl ether ND 0.50 ugll 1 5122020 09/22/05 09/22/05 EPA 8260E <br /> `Benzene ND 0.50 " <br /> ter[-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0.50 " <br /> 1,2-Dichloroethane 0.55 0.50 " <br /> Ethanol ND I00 " <br /> Ethyl tert-butyl ether ND 0.50 <br /> Ethylbenzene y ND 0.50 <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 <br /> Xylenes(total) 0.69 0.50 : " <br /> Gasoline Range Organics(C4-Cl2) 70 50 <br /> Surrogate:1,2-Dichloroethane-d4 82% 60-135 " <br /> Sequoia Analytical-Morgan Hill 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 ort a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br />' Page 12 of 25 <br /> ' j <br />