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HISTORICAL SUMMAA&ANALYTICAL RESULTS UNSATURATED ZONE SOIL GAS HARNEY LANE SANITARY LANDFILL WEST HEADER (TPH 1,6) Sample Type: Air Sampling Date 1/28/10 7/19/10 1/24/11 7/15/11 4/12/12 8/7/12 1/30/13 Monitoring and Field Parameters Methane Concentration (percent) NA NA 26.4 21.5 18.7 28.8 25 —carbon Dioxide (percent) NA NA 28.3 23.5 21.7 30.8 27.3 Oxygen (percent) NA NA 0.3 0.5 2.4 0.8 0.2 Volatile Organic Compounds EEO "v/v 7/28/11 Freon 12 350 260 550 120 250 280 240 Freon 11-4 57 45 68 46 43 45 <66 Chloromethane <120 __<84 220 <92 <300 <64 <660 Vinyl Chloride 180 200 340160 190 230 170 1,3-Butadiene <30 <21—<f9-1<2_3 <30 <16 <66 Bromomethane <30 <21 <19 <23 <300 <16 <660 Chloroethane 200 180 270 92 130 150 <270 Fmionl 1 <30 25 37 <23 <30 27 <66 Ethanol 0-0-4-7006-700 1200 610 5700 E 2200 Freon 113 <30 <21 <19 <23 <30 <16 <66 1,1-Dichloroethene <30 <21 <19 <23 <30 <16 <66 Acetone 1800 1900 2800 680 1200 1500 1900 2-Propanol 2900 2800 4300 1000 1100 2500 2000 Carbon Disulfide <30 <21 <19 <92 <120 <16 <270 3-Chloropropene <120 <84 <78 <92 <120 <64 <270 Methylene Chloride 300 190 300 66 <300 180 <660 Methyl tert-butyl ether <30 <21 <19 <23 <30 <16 <66 --trans-112-clichloroethene <30 <21 <19 <23 <30 <16 <66 Hexane 900 880 1400 6.60 720 1000 850 1,1-Dichloroethane 69 54 89 - <23 44 45 <66 2-butanone (Methyl Ethyl Ketone) 3300 3500 5000 1100 2000 2500 3000 cis-1,2-Dichloroethene 830 890 1200 810 820 1200 1000 Tetrahydrofuran 2400 2100 3900 1300 2000 3100 2400 Chloroform <30 <21 <19 <23 <30 <16 <66 1,1,1-Trichloroethane <30 <21 <19 <23 <30 <16 <66 Cyclohexane 700 730 1000 570 560 730 650 Carbon Tetrachloride <30 <21 <19 <23 <30 <16 <66 2,2,4-Trim ethyl penta n e 500 460 720 320 380 530 440 Benzene 490 490 700 340 380 530 470 - 1194�W e <30 <21 26 <23 <30 17 <66 West Header -WetUh -, "nn e --. -7122/201-3 2300 2300 3100 1800 1900 2300 2300 Page 1 of 3