Quantifying Uncontrolled Landfill Gas Emissions from Two Florida ...

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Table 3-31. Calculated Methane Flux and Prevailing Wind Speed and Direction Measured on February 24 along the Western VRPM Configuration in the Bioreactor Cell of Site #2 Time Methane Flux (g/s) Prevailing Wind Direction (degrees from North) Prevailing Wind Speed (m/s) 9:53:43 10 104 7.2 10:01:03 6.1 107 6.9 10:09:37 4.2 109 7.0 10:16:18 3.2 104 6.9 10:21:27 5.8 98 6.9 Average= 5.9 Standard Dev.=2.72 3.2.3 Total Site Methane Emissions The total site methane emissions for Site #2 were calculated using the methods described in Section 3.1.3 of this document. Table 3-32 presents the results of these calculations for Site #2: Table 3-32. Summary of Total Site Methane Emissions Calculations from Site #2 Calculation Control Cell Bioreactor Cell Total Surface Area of Top of Cell Total Surface Area of Slopes Methane Emission Factor of Top of Cell Methane Emission Factor of Slopes Total Methane Emission Factor of Cell Total Cell Methane Emissions 2 19,000 m 2 78,600 m 0 g/day/m 2 2/24/07 survey 0 g/day/m 2 2/25/07 survey 92 g/day/m 2 2/24/07 survey 60 g/day/m 2 2/25/07 survey 74 g/day/m 2 2/24/07 survey 48 g/day/m 2 2/25/07 survey 7,200 kg/day 2/24/07 survey 4,700 kg/day 2/25/07 survey Total Site Methane Emissions= 7300 kg/day 2 7,900 m 2 50,700 m 62 g/day/m 2 2/23/07 survey 25 g/day/m 2 2/24/07 survey 15 g/day/m 2 2/23/07 survey 14 g/day/m 2 2/24/07 survey 22 g/day/m 2 2/23/07 survey 15 g/day/m 2 2/24/07 survey 1,300 kg/day 2/23/07 survey 900 kg/day 2/24/07 survey The results show that the total cell methane emission factors calculated from the two surveys of the Control Cell (74 g/day/m 2 and 48 g/day/m 2 , respectively) were much higher than the total cell methane emission factors calculated from the surveys of the bioreactor cell (22 g/day/m 2 and 15 g/day/m 2 , respectively). This may be due to a fresh soil cover being added to the surface of the cell prior to the measurement campaign. In addition, because of high levels of moisture in the cell due to heavy rainfall, there were no additions of leachate or other liquids for several months. The exact moisture content of either cell was not provided during the field sampling campaign. 3-33
Based on the calculations presented in Table 3-33, the total methane emissions from Site #2 are estimated by calculating the sum of the average of the total methane emissions from the bioreactor and control cells, which is 7,300 kilograms per day. It should be noted that this estimated value is extrapolated from a limited amount of flux data, and does not take into account diurnal or seasonal trends in methane emissions. 3.2.4 Summa Canister Sampling Summa canister samples were collected from the gas collection header pipe in triplicate at Site #2. These samples represent a composite of LFG from the entire site. Samples were collected upstream of the vacuum pump to minimize loses and contamination. Blanks were also collected using a nitrogen gas stream to purge the VOST train condensers and glassware. Samples were analyzed using Methods TO-15, 25-C, a C1 through C6 alkane hydrocarbons analysis by GC/FID, and a permanent gases (O2, N2, CO2) analysis by GC/TCD. Results are presented in Tables 3-33 through 3-35. TO-15 results are qualified using results from the nitrogen blank. Any compounds reported in samples that are
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Quantifying Uncontrolled Landfill G
Page 3 and 4:
Foreword The U.S. Environmental Pro
Page 5 and 6:
3.1.3 Total Site Methane Emissions
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List of Tables Table 1-1. Target Co
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Table 3-28. Calculated Methane Flux
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Table C-6. Methane Concentrations (
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List of Figures Figure 1-1. Map of
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Executive Summary Waste decompositi
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Page 19 and 20: instrument (IMACC, Inc.). Figures 1
Page 21 and 22: Figure 1-3. Scanning Boreal GasFind
Page 23 and 24: wind direction data are collected n
Page 25 and 26: adsorption spectrometer. The analyz
Page 27 and 28: Table 1-2. Schedule of Work Perform
Page 29 and 30: Figure 2-2. Detail of measurement c
Page 31 and 32: corners of the cell, respectively.
Page 33 and 34: 2.2.3 Background Measurements Backg
Page 37 and 38: was aligned on the mirror targets i
Page 39 and 40: methane concentrations measured alo
Page 41 and 42: Figure 3-3 Summary of ORS measureme
Page 43 and 44: Table 3-5. Calculated methane flux
Page 45 and 46: Table 3-7. Calculated methane flux
Page 47 and 48: cell to the base. The following equ
Page 49 and 50: Table 3-9. Results of TO-15 analysi
Page 51 and 52: Table 3-10. Results of C1 to C6 and
Page 53 and 54: Table 3-14. Monomethyl Mercury Conc
Page 55 and 56: 3.2 Landfill Site #2 3.2.1 Control
Page 57 and 58: Table 3-17. Calculated Methane Flux
Page 63 and 64: 3.2.2 Bioreactor Cell 3.2.2.1 Febru
Page 67: Table 3-28. Calculated Methane Flux
Page 71 and 72: Table 3-34. Results for C1 to C6 an
Page 73 and 74: Table 3-38. Monomethyl Mercury Conc
Page 75 and 76: 3.3 Gas and Mercury Sampling Result
Page 77 and 78: Site #1 with a level of 83 ppmv. Th
Page 79 and 80: The surveys also found significant
Page 81 and 82: Monomethyl mercury concentrations i
Page 83 and 84: 5.1 Equipment Calibration Chapter 5
Page 85 and 86: The R 2 value was used to assess th
Page 87 and 88: the measured path-integrated methan
Page 89 and 90: 5.2.7 DQI Check of Total Mercury Sa
Page 91 and 92: Site #1 5.4 Site #2 77.9 Completene
Page 95 and 96: U.S. Environmental Protection Agenc
Page 97 and 98: d f e c b PDCs Y X a 2 12( y)( z) (
Page 99 and 100: When the VRPM configuration consist
Page 103 and 104: Table B-3. Distance, and Horizontal
Page 105 and 106: Table B-7. Distance, and Horizontal
Page 107 and 108: APPENDIX C Path-Averaged Methane Co
Page 109 and 110: Table C-3. Methane Concentrations (
Page 117 and 118: Table C-11. Methane Concentrations
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Table C-13. Methane Concentrations
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