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North State Environmental Laboratory C-% EL-%P# 1751 <br /> 90 South Spruce A-,enue Suite V • South San Francisco CA 94080 • (650) 266-4563 • FAX (650) 266-4560 <br /> CERTIFICATE OF ANALYSIS <br /> Job Number 00-0254 Date Sampled 02/23/2000 <br /> Client Western Geo-Engineers Date Analyzed 02/28/2000 <br /> Project ARC Pump & Weld Date Reported 03/03/2000 <br /> Volatile Organics by GC/MS Method 8260 <br /> Quality Control/Quality Assurance Summary <br /> Laboratory Number 00-0254 *,S/MSD RPD <br /> Client ID Blank 'Recovery <br /> Matrix WATER RATER <br /> Analyte Results -Recoveries <br /> ug/L <br /> Bromochloromethane ND<5 <br /> Dichlorodifluoromethane ND<5 <br /> Chloromethane ND<5 <br /> Vinyl Chloride ND<5 <br /> Bromomethane ND<5 <br /> Chloroethane ND<5 <br /> Trichlorofluoromethane ND<l <br /> 1-Dichloroethene ND<l 72 1 <br /> etone ND<50 <br /> Trichlorotrifluorcethane ND<1 <br /> Methylene Chloride ND<100 <br /> t-1,2-Dichloroethene ND<1 <br /> Methyl-t-butyl Ether ND<1 <br /> 1 1-Di.chloroethane ND<1 <br /> 2,2-Dichloropropane ND<l <br /> cis-1,2-Dichloroethene ND<1 <br /> 2-Butanone ND<10 <br /> Chloroform ND<l <br /> 1, 1, 1-Trichloroethane ND<1 <br /> Carbon Tetrachloride ND<l <br /> 1, 1-Dichloropropene ND<l <br /> Benzene ND<l 110 1 <br /> 1,2-Dichloroethane ND<l <br /> Trichloroethene ND<1 104 1 <br /> 1,2-Dichloropropane ND<1 <br /> Dibromomethane ND<l <br /> Bromodichloromethane ND<1 <br /> trans-1,3-Dichloropropene ND<1 <br /> 4-Methyl-2-Pentanone ND<IO <br /> Toluene ND<1 103 5 <br /> cis-1,3-Dichloropropene N0<1 <br /> 1,1,2-Trichloroethane ND<1 <br /> Tetrachloroethene ND<1 <br /> 1,3-Dichloropropane ND<l <br /> 2-Hexanone ND<1D <br /> Dabromochloromethane ND<l <br /> 1,2-Dibromoethane ND<l <br /> orobenzene ND<l 107 1 <br /> ,1,2-Tetrachloroethane ND<1 <br /> Ethylbenzene ND<l <br /> m,p-Xylene ND<1 <br /> Page 3 4f 4 <br />