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p Sequoia 885 Jarvis Drive <br /> Morgan Hilt,CA 95037 <br /> IyAnalytical `408776"9608 <br /> FAX(488))762-6308 <br /> ' www,sequoialabs.com <br /> URS Corporation[Arcoll Proicct:ARCO#2130,Stockton,CA M010544 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Nwnber:GOBZK-0002 Reported: <br /> Sacramento CA,95833 Project Manager:Vernon P.Elarth 09/29/05 14:23 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Morgan Hill <br /> Reporting <br /> Anatyte Result Limit Units Dilution Batch Prepared Analyzed Method Not <br /> r <br /> VW-2(MO10544-09)Water Sampled:09/11/05 07:45 Received:09/14/05 08:55 <br /> tett-Amyl methyl ether ND 0.50 ug/l 1 5122001 09/22/05 09/22/05 EPA 8260B <br /> Benzene 0.95 0.50 <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 0.50 <br /> 1,2-Dichloroethane 3.6 0.50 " <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 0.50 <br /> EthylbenzenO ND 0.50 <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Gasoline Range Organics(C4-C12) 64 50 " <br /> Surrogate:1,2-Dichloroethane-d4 80% 60-135 " <br /> CeVW-3(M010544-10)Water Sampled:09/11/05 13:40 Received:09/14/05 08:55 <br /> rt-Amyl methyl ether ND 0.50 UZA 1 5122001 09/22/05 09/22/05 EPA 8260B <br /> Benzene '' 1.0 0.50 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0.50 " <br /> 1,2-Dichloroethane 1.2 0.50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Ethylbenzenc 7.1 0.50 " <br /> Methyl tert-butyl ether 1.0 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) 3.7 0.50 " <br /> Gasoline Range Organics(C4-C12) 370 50 " <br /> Surrogate: 1.2-Dichloroethane-d4 80% 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 on a wet weight basis. <br /> This analytical report must tie reproduced in its entirety. <br /> Page 7 of 25 <br />