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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG -2 Deep <br />Sample Type: Air <br />Sampling Date 9/5/07 3/11/08 7/28/08 1/30/09 7/14/09 1/29/10 <br />Monitoring and Field Parameters <br />Methane Concentration percent 0 0 <br />Carbon Dioxide (percent) 0.5 1.2 1.6 1.2 0.9 1.8 <br />Oxygen (percent) 18.4 17.1 14.2 15.4 17.6 15.3 <br />Volatile Organic Coml2ounds PPB (v/v) <br />Acetone <br />4.7* <br />6.1 <br />8.5 <br /><4.1 <br />5.9 <br /><4.8 <br />p a- oroto uene <br /><1. <br /><1.0 <br /><1.6 <br />< <br /><1.2 <br /><1.2 <br />Benzene <br />.2 <br /><1.0 <br />< <br />< <br />< .2 <br />< .2 <br />romo is oromet ane <br /><1. <br /><1.0 <br /><1.6 <br /><1.0 <br />< <br /><1.2 <br />romo orm <br />< <br />< <br />< <br />< <br /><1.2 <br /><1.2 <br />Benzyl Chloride <br />< <br /><1.0 <br /><1.6 <br /><1.0 <br />< <br /><1. <br />romomet ane <br />< <br />< <br />< <br />< <br /><1.2 <br /><1. <br />Carbon Disulfide <br />4.2 <br />< <br />< <br />< <br /><1.2 <br /><1. <br />1,3 -Butadiene <br />< <br />< <br /><1. <br /><1.0 <br /><1.2 <br /><1.2 <br />2- utanone <br />2.6 <br />< .0 <br /><1.6 <br /><1.0 <br />1.4 <br />2 <br />Carbon Tetrachloride <br />< <br />< <br /><1. <br />< <br /><1.2 <br /><1.2 <br />C obenzene <br /><1.1 <br /><1.0 <br /><1.6 <br /><1.0 <br />< <br /><1.2 <br />Chloroet ane <br /><1.1 <br />< <br />< <br />< <br /><1.2 <br /><1.2 <br />Ch oro orm <br /><1. <br /><1. <br /><1.6 <br /><1.0 <br />< <br /><1.2 <br />Chloromethane <br /><4, <br /><4. <br /><6.2 <br /><4. <br /><4.9 <br /><4. <br />3- h oropropene <br /><4.6 <br />.umPmP <br />< <br /><1.0 <br /><1.6 <br /><1. <br /><1. <br /><1.2 <br />1,2 -Dichlorobenzene <1. <1.0 <1.6 < <1.2 <1.2 <br />1,3 -Dichlorobenzene <1. <1.0 <1.6 <1.0 <1.2 <1.2 <br />nP <br />