Quantifying Uncontrolled Landfill Gas Emissions from Two Florida ...

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Figure 3-2 Summary of ORS measurements from the 5:00 pm survey of the control cell of Site #1 The figures show that the prevailing winds were from the southwest during the time of the measurements. Based on the prevailing wind direction, the southern and western VRPM planes are located upwind of the actual landfill cell, so flux values measured along these VRPM planes represent methane emissions from the southern and western slopes of the cell. The VRPM planes located along the northern and eastern boundaries of the cell are downwind of the landfill cell. The methane flux values measured during the 4:00 p.m. survey along the northern, eastern, southern, and western VRPM measurement planes were 3.8, 4.8, 0, and 3.3 grams per second, respectively (the value of 0 grams per second is used because the methane concentration measurements from the southern VRPM plane were below the atmospheric background value of 1.7 ppm). The difference between the sum of the fluxes measured along the northern and eastern planes (8.6 g/s) and the southern and western planes (3.3 g/s), 5.3 grams per second, represents the calculated methane flux value from the top of the landfill cell (defined as the flat surface area where instrumentation was deployed). The sum of the flux values measured along the southern and western planes, 3.3 grams per second, represents the calculated methane flux value from the southern and western slopes of the landfill cell. The methane flux values measured during the 5:00 p.m. survey along the northern, eastern, southern, and western VRPM measurement planes were 2.0, 12, 5.2, and 0.77 grams per second, respectively. The difference between the sum of the fluxes measured along the northern and eastern planes (14 g/s) and the southern and western planes (6.0 g/s), 8.0 grams per second, represents the calculated methane flux value from the top of the landfill cell (defined as the flat surface area where instrumentation was deployed). The sum of the flux values measured along the southern and western planes, 6.0 grams per second, represents the calculated methane flux value from the southern and western slopes of the landfill cell. As mentioned previously, due to problems with alignment of the OP-TDLAS instrument, data was collected along only one beam path of the southern VRPM plane. By comparing the 3-3
methane concentrations measured along this beam path with the methane concentrations measured along the corresponding beam path of the eastern VRPM configuration, it was possible to estimate the methane flux value along the southern VRPM configuration, assuming similar source size and distance of the source (hotspot) from both VRPM planes. The following formula was used to estimate the methane flux value along the southern boundary of the cell. Where: F1 = [ M1/M2] [F2] (2) F1 = M1 = M2 = F2 = methane flux value along the southern VRPM configuration path-integrated methane concentration measured along longest surface beam path of the southern VRPM configuration path-integrated methane concentration measured along longest surface beam path of the eastern VRPM configuration calculated methane flux value along the eastern VRPM configuration Tables 3-1, 3-2, and 3-3 present the calculated methane flux, measurement time, prevailing wind speed, and prevailing wind direction during the time of the VRPM measurements (4:00 p.m. and 5:00 p.m. surveys) along the northern, eastern, and western VRPM configurations, respectively. Table 3-1. Calculated methane flux and prevailing wind speed and direction measured along the northern VRPM configuration in the control cell of Site #1 Survey Time Methane Flux (g/s) Prevailing Wind Direction (degrees from North) Prevailing Wind Speed (m/s) 4 p.m. 16:11:52 3.8 228 4.1 5 p.m. 17:15:51 1.9 255 2.7 Table 3-2. Calculated methane flux and prevailing wind speed and direction measured along the eastern VRPM configuration in the control cell of Site #1 Survey Time Methane Flux (g/s) Prevailing Wind Direction (degrees from North) Prevailing Wind Speed (m/s) 4 p.m. 15:59:30 7.1 220 5.3 4 p.m. 16:04:48 2.6 228 4.7 5 p.m. 17:17:04 12 258 2.7 Table 3-3. Calculated methane flux and prevailing wind speed and direction measured along the western VRPM configuration in the control cell of Site #1 Survey Time Methane Flux (g/s) Prevailing Wind Direction (degrees from North) Prevailing Wind Speed (m/s) 4 p.m. 16:08:37 3.3 227 4.4 5 p.m. 17:12:38 0.77 253 3 3-4
Page 1 and 2: 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
Page 7 and 8: List of Tables Table 1-1. Target Co
Page 9 and 10: Table 3-28. Calculated Methane Flux
Page 11 and 12: Table C-6. Methane Concentrations (
Page 13 and 14: List of Figures Figure 1-1. Map of
Page 15 and 16: 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
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Page 37: was aligned on the mirror targets i
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 63 and 64: 3.2.2 Bioreactor Cell 3.2.2.1 Febru
Page 69 and 70: Based on the calculations presented
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
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5.2.7 DQI Check of Total Mercury Sa
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Site #1 5.4 Site #2 77.9 Completene
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U.S. Environmental Protection Agenc
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d f e c b PDCs Y X a 2 12( y)( z) (
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When the VRPM configuration consist
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Table B-3. Distance, and Horizontal
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Table B-7. Distance, and Horizontal
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APPENDIX C Path-Averaged Methane Co
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Table C-3. Methane Concentrations (
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Table C-11. Methane Concentrations
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