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oweN6. <br /> 10 $0 North State Environmental Laboratory CA FLAP#1753 <br /> 90 South Spruce Avenue, Suite V - South San Francisco, CA 94080 - (650) 266-4563 - FAX (650) 266-4560 <br /> C E R T I F I C A T E O F A N A L Y S I S <br /> Job Number 00-0423 Date Sampled 03/23/2000 <br /> Client Western Geo-Engineers Date Analyzed 04/06/2000 <br /> Project R603/R603-Sewer Date Reported 04/11/2000 <br /> Volatile Organics by GC/MS Method 8260 <br /> Quality Control/Quality Assurance Summary <br /> Laboratory Number 00-0423 MS/MSD RPD <br /> Client ID Blank Recovery <br /> Matrix WATER WATER <br /> Analyte Results %Recoveries <br /> ug/L <br /> Bromochloromethane ND<5 <br /> Dichlorodifluoromethane ND<5 <br /> Chloromethane ND<5 <br /> Vinyl Chloride ND<1 <br /> Bromomethane ND<5 <br /> Chloroethane ND<5 <br /> Trichlorofluoromethane ND<l <br /> 1,1-Dichloroethene ND<l 101 3 <br /> Acetone ND<50 <br /> Trichlcrotrifluoroethane ND<1 <br /> Methylene Chloride ND<50 <br /> t-1,2-Dichloroethene ND<1 <br /> Methyl-t-butyl Ether ND<50 <br /> 1,1-Dachloroethane ND<l <br /> 2,2-Dlchloropropane ND<l <br /> cis-1,2-Dachloroethene ND<l <br /> 2-Butanone ND<10 <br /> Chloroform ND<1 <br /> 1,1,1-Trichloroethane ND<l <br /> Carbon Tetrachloride ND<1 <br /> 1,1-Dichloropropene ND<1 <br /> Benzene ND<l 11 6 <br /> 1,2-Dichloroethane ND<l <br /> Trichloroethene ND<1 100 4 <br /> 1,2-Dichloropropane ND<l <br /> Dibromomethane ND<l <br /> Bromodichloromethane ND<l <br /> trans-1,3-Dichloropropene ND<1 <br /> 4-Methyl-2-Pentanone ND<10 <br /> Toluene ND<1 122 9 <br /> cis-1,3-Dichloropropene ND<1 <br /> 1,1,2-Trichloroethane ND<l <br /> Tetrachloroethene ND<1 <br /> 1,3-Dichloropropane ND<1 <br /> 2-Aexanone ND<10 <br /> Dibromochloromethane ND<1 <br /> 1,2-Dibromoethane ND<1 <br /> Chlorobenzene ND<l 105 9 <br />*1,1,1,2-Tetrachloroethane ND<1 <br /> Ethylbenzene ND<l <br /> m,p-Xylene ND<1 <br /> Page 3 Of 4 <br />