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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE AIR <br /> NORTH COUNTY SANITARY LANDFILL <br /> SG-2 Intermediate <br /> Sample Type:Air <br /> Sampling Date 9/29/03 2/12/04 5/7/04 7/22/04 11/8/04 2/10/05 9/29/05 6/26/06 <br /> Monitorina and Field Parameters <br /> Methane Concentration percent 0.9 0 0 <br /> Volatile Organic Compounds PPB(v/v) <br /> Benzene <0.5 <0.5 29 <0.5 <0.5 <0.5 <0.5 ND <br /> Benzyl Chloride <1.0 <1. <1.0 < <1.0 <1.0 <1.0 ND <br /> bromomethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 30 ND <br /> Carbon Tetrachloride <0.5 < < < <0.5 <0.5 <0.6 NO <br /> Chlorobenzene <0.5 <0.5 <0.5 4.6 3.7 <0. <0.5 ND <br /> Chloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> Chloroform <0.5 <0.5 1.7 <0.5 <0.5 <0.5 <0.5 8.4 <br /> Chloromethane <0.5 <0.5 <0.5 1.1 <0.5 <0.5 27 N <br /> 1,2- i romoethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> 1,2-Dichlorobenzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NO <br /> 1,3-Dichlorobenzene <0.5 <0.5 <0.6 <0.5 <0. <0.5 <0.5 <br /> 1,4-Dichlorobenzene <0.5 1.5 e0. <0.5 <0.5 <0.5 <0.5 ND <br /> Dichlorodifluoromethane 32 54 36 262 232 712 11 ND <br /> 1,1-Dic loroethane <0.5 <0.5 <0.5 <0.5 <0.5 --<U.-5 <0.5 ND <br /> 1,2-Dichloro-1,1,2,2-Tetrafluoroethane 2 4.6 2.6 28 28 75 <0.5 ND <br /> 1,1-Dichloroethylene <0.5 <0.5 <0.5 8.0 3.8 <0.5 <0.5 ND <br /> cis-1,2-Dichloroethene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> 1,2-Dichloropropane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> cis- ,3- ichloropropene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> trans-1,3- is loropropene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 N <br /> Ethylbenzene <0.5 <0.5 <0.5 0.9 <0.5 <0. <0.5 ND <br /> Hexachiorobutadiene <1.0 <1.0 <1.0 <1.0 <1. <1.0 <1.0 ND <br /> eth ene Chloride 2.9 5.3 <1.0 (1.2) 0. <1.0 <1.0 NO <br /> styrene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> 1,1,2-i nchloro-i,2,2-i nnuoroetnane <0.5 <0.5 <0.5 2.1 1.9 4.4 <0.5 ND <br /> 1,1,2,2-Tetrachloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> etra oroet ene <0.5 <0.5 <0.5 3.1 6.1 5.1 <0.5 <br /> Toluene <0.5 8.6 <0.5 1.3 1.4 <0. <0.5 ND <br /> 1, - richloro enzene <1.0 <1.0 <1.0 <1.0 <1.0 <1. <1.0 ND <br /> 1,1,2-Trichloroethane <-03.5 <0.5 <0.5 < <0, <0,5 <0.5 ND <br /> 1, ,1- n loroet ane < <0.5 <0.5 <0.5 <0.5 <0. <0.5 ND <br /> Tn oroethene <1.0 <1.0 <1. < <1. <1.0 <1.0 ND <br /> Trichlorofluoromethane 6.2 7.6 <0.5 32 34 108 2.1 ND <br /> 1,3,5- nmet yl enzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> 1,2, nmet y enzene <0.5 1.1 <0.5 1.4 <0.5 <0.5 <0.5 ND <br /> Vinyl Ch'onae <0,5 <0,5 <0.5 <0.5 <0.5 4,9 <0.5 NO <br /> m/p Xylene <0.5 2.1 <0.6 2.2 1.1 <0.5 <0.5 ND <br /> o-Xylene <0.5 <0.5 <0.5 1.1 <0.5 <0.5 <0.5 ND <br /> Not Required <br /> NT=Not Tested <br /> =Trace Concentration <br /> {1} Parameter also detected in one or more quality control blanks. <br /> ® S�;Pnr�31/2� M M M M M M M <br />