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HISTORICAL SUMMARY OF ANALYTICAL RESULT: <br /> UNSATURATED ZONE AIR <br /> NORTH COUNTY SANITARY LANDFILL <br /> SG-T <br /> Sample Type:Air <br /> Sampling Date 2/19/04 5/7/04 7/22/04 11/9/04 2/10/05 9/30/05 6/29/06 <br /> Monitoring and Field Parameters <br /> Methane Concentrati6n(percent) 0 0 0 0 3.6 <br /> Volatile Organic Compounds PPB_ (v/v) <br /> Benzene 82 <0.5 <0.5 <0.5 <0.5 <0.5 11 <br /> Benzy hloride <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 D <br /> Bromomethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NO <br /> Carbon etrachloride 0.90 <0.5 <0.5 <0.5 <0.5 <0.5 NO <br /> Ch oronzene <0.5 <0.5 <0.5 1.0 <0.5 <0.5 NO <br /> Ch oroethane 0.9 <0.5 2.1 <0.5 <0.5 <0. O <br /> hloro rm 1.0 <0.5 <0, <0.5 3.5 <0.5 N <br /> Chloromethane 1.6 <br /> 1,2- i romoet ane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NO <br /> 1,2-Dichlorobenzene 1.0 <0.5 <0.5 <0.5 <0.5 < .5 <br /> 1,3-Dichlorobenzene 0.90 <0. 2.7 4.8 <0.5 <0.5 NO <br /> 1,4- 1 orobenzene 1.0 <0.5 2.5 4.9 <0.5 <0.5 N <br /> Dichlorodi uoromethane .2 <br /> 1- i loroe ane <0.5 <br /> i oroethane < . <0.5 < .5 <0. <1. < <br /> 1,2- i oro-1,1,2,2- etre uoroethane 1.4 <0.5 <0.5 <0.5 9.4 18 <br /> 1,1- i loroe ene <0.5 <0.5 <0.5 <0.5 < .5 < .5 ND <br /> cis-1,2- i loroethene <0.5 <0.5 <0. 0 <0.5 <0.5 N <br /> 1,2- ichoropropane 0.90 < .5 <0. <0.5 <0.5 < .5 D <br /> as-1,3- i oropropene ,<0.5 <0.5 <0.5 <0.5 <0.5 <br /> trans 1,3 Dichloropropene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NO <br /> t benzene 2.6 <0.5 .3 <0.5 <0.5 <0.5 N <br /> Hexachlorobuta iene <1.0 <1.0 <1.0 < <1. <br /> Methylene hloride 16 2.5 <0.5 <0.5 I P < 5 N <br /> S yren` <0.5 1.1 <0.6<0.5 <u.b <u.5 Nu <br /> 1,1, - ric oro-1,2, - ri uoroethane 0.90 2. 7.5 <0.5 6.7 15 ND <br /> 1,1,2,2-Tetrachloroethane 1.1 <0.5 <0.5 0.9 <0.5 <0.5 -ffD- <br /> Tetrachloroet ene P 1. <0.5 <0.5 3.9 14 24 6 2 <br /> Toluene 2.8 10 <br /> 1, rich orobenzene 1.1 <0.5 <0.5 <0.5 <1.0 <1.0 D <br /> 1,1, - n loroe ane <0.5 <0.5 < < <0.5 <0.5 ND <br /> 1,1,1-Trichloroethane 1.0 <0.5 < , < 9.5 <br /> Trichloroethene 1* <1.0 <1. < 6,5 NO <br /> Trioro uoromethane 2.3 <0.5 <0.5 <0 7 66 170 <br /> 1,3,5-Trim enzene 1. < < <0.5 <0.5 <0.5 NO <br /> 1,2,4-Inmetnylbenzene 1.9 2.4 1.8 1.1 < <u.a rvu <br /> Vinyl unloncle <0.5 < .5 1.5 <0.5 < . < <br /> m/p xylene 7.6 1.3 5.7 6.0 <0.5 <0.5 4.2 <br /> o-Xylene 3.8 <0.5 1. 1.1 <0.5 <0.5 NO <br /> Not Required <br /> NT=Not Tested <br /> =Trace Concentration <br /> (1) Parameter also detected in one or more quality control blanks. <br /> M SCMnted4ft006"j M M M f M M M me �, <br />