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HISTORICAL SUMMARY OF ANALYTICAL RESULT: <br /> UNSATURATED ZONE AIR <br /> NORTH COUNTY SANITARY LANDFILL <br /> SG-4 <br /> Sample Type:Air <br /> Sampling Date 9/29/03 2/12/04 5/7/04 7/22/04 11/9/04 2/10/05 9/30/05 6/26/06 <br /> Monitorina and Field Parameters <br /> Methane Concentration(percent) 0 0 0 0 0 0 0 0 <br /> Volatile Oroanic Compounds PPB(v/v <br /> Benzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NO <br /> Benzyl Chloride <1.0 < .0 <1.0 <1,0 < <1.0 <1.0 ND <br /> Bromomethane <0.5 <0.5 <0. <0.5 <0.5 <0.5 6.9 ND <br /> Ca on Tetrachloride <0.5 4.1 <0.5 1.0 <0.5 3.8 4.9 ND <br /> Chlorobenzene <0,5 < < <0.5 < <0.5 <0.5 N <br /> Chloroethane <0.5 <0.5 <0.5 < .5 <0. <0.5 <0.5 NO <br /> ororm <0.5 <0. <0.5 <0.6 <0.5 < <0.5 ND <br /> Chloromethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> ,2-Dibromoethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> is oro enzene <0.5 1.6 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> 1,3-Dichlorobenzene <0.5 <0.5 <0.5 < .5 <0.5 <0.5 <0.5 ND <br /> 1,4-Dichlorobenzene <0.5 13.9 <0.5 <0.6- <0.5 <0.5 <0.5 ND <br /> is orodi uoromethane < ,5 5 <0.5 2.4 <0.5 17 6.2 16 <br /> 1,1-Di oroethane <0.5 1.7 <0.5 <0.5 <0.5 2.3 2.4 ND <br /> 1,2-Di oroethane <0.5 <0.5 <0.5 <0.5 <0.5 <1.0 <1.0 ND <br /> 1,2-Dichoro-1,1, ,2-Tetra uoroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> 1,1- ichloroethylene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> cis-1,2-Dichloroethene <0,5 <0.5 <0, <0.5 <0.5 <0.5 <0.5 ND <br /> 1,2- i oropropane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> cis-1,3-Dichloropropene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NO <br /> trans-1, ichloropropene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> Ethylbenzene <0.5 1.4 <0.5 <0.5 <0. <0.5 <0.5 N <br /> Hexach orobutadiene 0.8 <1.0 <1. <1.0 <1. <1.0 <1.0 ND <br /> Methy ene Chloride .3 2.4 <1.0 1.0 <1.0 <1.0 <1.0 ND <br /> Styrene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> 1,1,2fnchloro-1,2,2-innuoroethane <0,5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> 1,1,2,2-Tetrachloroethane <0.5 <0.5 < <0.5 <0.5 <0.5 <0.5 ND <br /> Tetra oroethene PCE <0.5 4.8 <0.5 <0.5 <0.5 <0.5 4 <br /> Toluene <0.5 6.7 14 <0.5 1.4 <0.5 <0.5 ND <br /> 1,2, n lorobenzene .9 <0.5 < <0.5 <0.5 <1. <1.0 O <br /> 1,1,2- nchloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> 1,1,1-Trichloroethane <0.5 1.1 <0. <0.5 <0.5 <0.5 <0.5 ND <br /> Trichloroethene <1.0 <1.0 < < <1.0 <1. <1.0 ND <br /> Tri oro uoromethane < .5 8.2 <0.5 2.5 <0.5 11 8.9 11 <br /> 1,3,5-Trimethylbenzene <0.5 3.2 <0.5 <0.5 <0.5 <0.5 <0.5 N <br /> 1,2,4-1nmethylbenzene <0.5 6.6 1.5 <0.5 <0.5 <0.5 <0.5 ND <br /> Vinyl Chlonae <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ND <br /> m p nyiene <0.5 10.1 < 5 <0 0.9 <0.5 <0.5 ND <br /> o-Xy ene <0.5 1.5 < <0.5 <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 /> SG-4;Printed:7/31/2006 1 Of 1 <br />