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6) (408) <br /> 815Jarvis 037Sequofa Morgan Hi HiIE,CA 950377 776-9600 <br /> Analytical FAX(408)782-6308 <br /> www.sequaialabs.corn <br /> URS Corporation[Arcoll Project:ARCO 45450,Stockton,CA MOE0229 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZN-0001 Reported: <br /> Sacramento CA,95833 Project Manager:Jeff Brooks 05/24/05 16:37 <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 /> MW-4(MOE0229-03)Water Sampled:05/0510511:10 Received:05/07/05 08:30 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 5050103 05/18/05 05/18/05 EPA 8260B <br /> Benzene ND 0.54 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <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 0.54 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 <br /> Surrogate:Dibromofluoromethane 96% 84-112 " <br /> Surrogate:1,2-Dichloroethane-d4 107% 74-135 " <br /> S0-urrogate:Toluene-d8 97% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 119% 86-119 " <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 be reproduced in its entirety. <br /> Page 5 of 9 <br />