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HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE AIR NORTH COUNTY SANITARY LANDFILL SG -7 Sample Type: Air Sampling Date 9/5/07 3/11/08 7/28/08 1/23/09 7/14/09 1/29/10 Monitoring and Field Parameters Me t ane oncentration (percent) 0 0 0 0 NT Carbon Dioxide (percent) 3.5 1.4 2 1.8 NT 2.2 Oxvoen (percent) 16.5 17.6 17.9 16.4 NT 14.9 Volatile Organic Compounds PPB (v/v) - 1 • 1 - I •J - 1 • 1 . V . - - Acetone 5.3 6.8 14 NT 7.7 <4.5 AI -h a -Chi o1 rot-oluene < < .0 < NT <1.1 <1.1 Benzene < <1. <1. NT <1. <1.1 Brom® 1ch�ioromet ane <1. <1.0 < NT <1, <1.1 Bromo orm < < <1, T <1.1 <1.1 Benzyl Monde Bromomet�ne <1.1 < .1 < <1.0 < f <1. < - <1.1 <1.1 X1.1 < .1 <1.1 2-Dic oro-1,1,2,3-etrafluoroet ane(Freon 4) <1.1 I <1.1 NT 1,3 -Butadiene <1.1 <1.0 <1.1 NT <1.1 <1.1 2-butanone 2.0 <1.0 < NT 1.6 1.6 Carbon Tetrac ®ride <1.1 <1.0 < <1. <1.1 Chlorobenzene < <1.0 < .1 <1. <1.1 oroet ane < .1 <1.0 < < <1.1 �fiioro orm < < <1,1 NT < <T-1 oromet ane <4.6 <4.0 <4.5 NT <4.6 <4.5 3-Chloropropene <4. <4.0 <4.5 NT <4. <4.5 umeme <1. <1.0 <1.1 NT <1. <1.1 --i,2-Di_ romoet ane < < <1.1 NT <1.1 <1. IJ1Drcrnocnwru1 I ieu lane - 1 • 1 - I •J - 1 • 1 . V . - - D- ich7oro enzene < <1.0 <1.1 NT <1.1 <1. - 1,3-Di-ciToro enzene < <1.0 <1.1 NT <1.1 <1.1 1,4-Dic lorobenzene < <1.0 < NT < . <1.1 Dic orodi uoromet ane Freon 12) <1.1 13 <1.1 NT 16 36 1,1 Dico roethane <1.1 <1.0 <1.1 NT <1.1 <1.1 2-Dich oroethane <1.1 <1.0 <1.1 NT < .1 <1.1 2-Dic oro-1,1,2,3-etrafluoroet ane(Freon 4) <1.1 I <1.1 NT 1.2 3.1