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HISTORICAL SUMMARY OF ANALYTICAL RESULT; <br /> UNSATURATED ZONE AIR <br /> NORTH COUNTY SANITARY LANDFILL <br /> SG-3 Shallow <br /> Sample Type:Air <br /> Sampling Date 11/14/03 2/12/04 5/7/04 7/22/04 11/8/04 2/10/05 9/29/05 6/26/06 <br /> Monitoring and Field Parameters <br /> Methane Concentration percent <br /> Volatile Organic Compounds PPB y/v� <br /> Benzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 < .5 <br /> Benzyl Chloride <1.0 <1.0 <1. < .0 <1.0 < <1.0 N <br /> bromomethane <0.5 <0.5 <0.5 <0.5 < <0.5 <0.5 Nu <br /> Carbon Tetrachloride <0.5 <0.5 <0.5 <0.5 < <0. <0.5 NO <br /> lora enzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 < .5 <br /> Chloroethane <0.5 <0.5 <0.5 <0.5 <0. <0.5 <0.5 <br /> h oroorm <0.5 <0.5 <0.5 <0.5 <0.5 <0. <0.5 NO <br /> Chforomethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> 1,2- ibromoethane <0.5 <0.5 <0.5 <0.5 <0.6 <0.5 <0.5 NO <br /> 1,2-Dichlorobenzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 N <br /> 1,3-Dichlorobenzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 < .5 <br /> 1,4-Dichlorobenzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Dichlorodifluoromethane <0.5 <0.5 1.6 2.0 1.8 2.9 <0.5 N <br /> 1,1-Dichloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> 1,2-Dichloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <1.0 <1.0 <br /> 1,2-Dichloro-1,1,2,2-Tetrafluoroet ane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NO <br /> 1,1-lichloroethylene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> cis- ,2- ichloroethene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 WD- <br /> 1,2- ichoropropane <0.5 <0.5 <0.5 < <0.5 <0.5 <0.5 <br /> cis-1, - ich oropropene <0.5 <0.5 <0. < <0. <0.5 < .5 NO <br /> trans- ,3- ichloropropene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 N <br /> thy enzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NO <br /> mexachlorobutadiene <1.0 <1. <1.0 <1.0 <1. <1.0 <1.0 NO <br /> Methylene hlonde16 2.8 <1.0 .0 .2 <1. <1. <br /> tyrene <br /> <u.5 <0,5 <0.6 <0.5 <0.55 <br /> < 5NO <br /> 1,1,'2- rchloro-1,2,2-Trifluoroethane <0.5 <0.5 < .5 < .5 < , < .5 < , <br /> 1,1,2,2-Tetrachloroethane < , <0.5 <0.5-<0.5 <0.5 <0,5 < ,5 <br /> etrac oroethene PC <0.5 <0.5 <03 <T6--<0.5 <0 <0.5 NO <br /> To uene <0.5 4.9 19.0 1.1 <0.5 <0.5 ND <br /> 1,2, n lorobenzene <1.0 <1. <1.0 <1.0 <1.0 < <1.0 <br /> 1,1,2-Trichloroethane <0.5 <0.5 <0.5 < <0.5 <0.5 <0.5 <br /> 1,1,1-Trichloroethane <0. <0. <0.5 <0.5 <0.5 < <0.5 <br /> richloroet ene <1.0 <1.0 <1.0 < <1. < <1.0 ND <br /> Trichlorofluoromethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.6 <0.5 NO <br /> 1, ,5- rimeth lbenzene <0.5 < .5 < . < < <0.5 <0.5 ND <br /> 1, , rime ylbenzene <0.5 <0.5 2.2 1.1 < .5 < .5 <0.5 ND <br /> Vinyl Chloride <0.5 <0.5 < .5 < .5 <0. <0.5 <0.5 ND <br /> m p y ene <0.5 <0.5 <0.5 1.9 0.9 <0.5 <0.5 NO <br /> o Xylene <0.5 <0.5 <0.5 0.9 <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 /> M S I;P /311 r M M <br />