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(D (408)BBSDave <br /> Sequoia Morgan Hilll CA CA 95031 <br /> Analytical FAX 772-9600 <br /> 408 782-6308 <br /> www sequotalabs cam <br /> • <br /> URS Corporation[Arco 13 Project ARCO#2186,Stockton,CA M010313 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOBZM-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 09/28/05 10 46 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analyhcal-Morgan Hill <br /> Reportmg <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Now <br /> MW-7(MOI0313-07)Water Sampled 09/08/05 06 43 Received 09/09/05 07 55 <br /> tert-Amyl methyl ether ND 050 ugtl 1 5I20037 09/20/05 09/21/05 EPA 8260B <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C12) ND 50 <br /> Surrogate 1 2-Dtchloroethane-d4 83% 60-135 " <br /> W-8(M010313-08)Water Sampled 09/08/05 12 21 Received 09/09/05 07 55 <br /> low tert-Amyl methyl ether ND 050 ug/l 1 5120037 09/20/05 09/21/05 EPA 8260B <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dtchloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl text-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl tett-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) 10 050 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 1 2-Dichloroelhane-d4 86% 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 we/weight basis <br /> • This analytical repor,must he reproduced in its entirety <br /> Page 6 of 12 <br /> 1 <br />