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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE AIR <br /> NORTH COUNTY SANITARY LANDFILL <br /> Sample Type:Air SG-3 Deep <br /> Sampling Date 7/22/04 11/8/04 2/10/05 9/30/05 6/26/06 <br /> Monitoring and Field Parameters <br /> Methane Concentration(percent) <br /> Volatile Organic Compounds PPB(v/v) <br /> Benzene <0.5 <0.5 <0.5 <0.5 N <br /> Benzyl Chloride <br /> <1.0 <1.0 <1.0 <1.0 ND <br /> Bromomethane <0.5 <0.5 <0.5 <0.5 N <br /> Carbon Tetrachloride <0.5 <0.5 <0.5 <0.5 N <br /> hlorobenzene <0.5 <0.5 <0.5 <0. NO <br /> Chloroethane <0.5 <0.5 <0.5 <0.5 NO <br /> h oro orm <0.5 <0.5 <0.5 <0.5 NO <br /> Chloromethane <0.5 <0.5 <0.5 1 D <br /> 1,2- i romoethane <0.5 <0.5 <0.5 <0.5 ND <br /> 1,2-Dichlorobenzene <0,5 <0.5 <0.5 <0.6 <br /> 1,3-Dichlorobenzene <0.5 <0.5 <0.5 <0.5 NO <br /> 1,4-Dichlorobenzene < .5 <0.5 <0.5 <0.5 ND <br /> Dichlorodifluoromethane <0.5 <0.5 2.2 <0.5 NO <br /> 1,1- i oroethane <1.0 <1. <0.5 <0.5 ND <br /> 1,2-Dic loroethane <0.5 <0.5 < <1.0 NO <br /> i oro- ,2- etra uoroethane <0.5 <0.5 <0.5 <0.5 <br /> 1, - i oroe y ene <0.5 <0.5 <0.5 <0.5 NO <br /> cis-1,2-Dichloroethene <0.5 <0.5 <0.5 <0.5 NO <br /> 2-Dichloropropane <0.5 <0.5 <0.5 <0.5 ND <br /> cis- ,3- is oropropene <0.5 <0.5 <0.5 <0.5 NO <br /> trans-1.3-Di oropropene <0.5 <0.5 <0.5 <0.5 ND <br /> Ettyl enzene <0.5 <0.5 <0.5 <0.5 NO <br /> Hexachlorobuta iene <1.0 <1.0 <1.0 <1.0 NO <br /> Methylene Chloride <1.0 0.9 <1.0 <1.0 ND <br /> Styrene <0.5 <0.5 <0.5 <0.5 N <br /> 1,1, - nchloro-1,2,2- nfluoroethane < .5 <0.5 <0.5 <0.5 ND <br /> 1,1,2,2-Tetrachloroethane ---<-O-.5 <0.5 <0.5 <0.5 ND <br /> etra loroethene ) <0.5 <0.5 <0.5 <0.5 NO <br /> Toluene <0.5 <0.5 <0.5 <0.5 NO <br /> 1,2, nchlorobenzene <1.0 <1.0 <1.0 <1.0 <br /> 1,1,2-Trichloroethane <0.5 <O.S < ,5 <0.5 <br /> 1,1,1-Trichloroethane < ,5 <0,5 <0.5 <0.5 ND <br /> Trichloroethene <1, <1, <1.0 <1.0 NO <br /> Trichlorofluoromethane <0.5 < .5 <0.5 <0.5 N <br /> 1, nmethylbenzene <0.5 <0.5 <0.5 <0.5 NO <br /> 1,2,4- rimethyibenzene <0.5 <0.5 <0.5 <0.5 NO <br /> Vinyl Chloride <0.5 <0.5 <0.5 <0.5 NO <br /> m/p Xylene <0.5 <0.5 <0.5 <0.5 ND <br /> 6-Xylene <0.5 <0.5 <0.5 <0.5 D <br /> NR=Not Required <br /> NT=Not Tested <br /> =Trace Concentration <br /> {1) Parameter also detected in one or more quality control blanks. <br /> r SGWep;F�7/31M <br />