Where:
GCH4 = Modeled methane generation in reporting year T (metric tons CH4).
X = Year in which waste was disposed.
S = Start year of calculation. Use the year 1960 or the opening year of the landfill, whichever is more recent.
T = Reporting year for which emissions are calculated.
WX = Quantity of waste disposed in the industrial waste landfill in year X from measurement data and/or other company records (metric tons, as received (wet weight)).
DOCX = Degradable organic carbon for waste disposed in year X from Table TT-1 to this subpart or from measurement data [as specified in paragraph (a)(3) of this section], if available [fraction (metric tons C/metric ton waste)].
DOCF = Fraction of DOC dissimilated (fraction); use the default value of 0.5. If measured values of DOC are available using the 60-day anaerobic biodegradation test procedure identified in § 98.464(b)(4)(i) , use a default value of 1.0.
MCF = Methane correction factor (fraction). Use the default value of 1 unless there is active aeration of waste within the landfill during the reporting year. If there is active aeration of waste within the landfill during the reporting year, use either the default value of 1 or select an alternative value no less than 0.5 based on site-specific aeration parameters.
F = Fraction by volume of CH4 in landfill gas (fraction, dry basis, corrected to 0% oxygen). If you have a gas collection system, use the annual average CH4 concentration from measurement data for the current reporting year; otherwise, use the default value of 0.5.
k = Decay rate constant from Table TT-1 to this subpart (yr-1). Select the most applicable k value for the majority of the past 10 years (or operating life, whichever is shorter).
Where:
WDF = Average waste disposal factor as determined for the first annual report required for this industrial waste landfill (metric tons per production unit).
X = Year in which waste was disposed. Include only those years for which disposal and production data are both available; the years do not need to be sequential.
Y1 = First year in which disposal and production/throughput data are both available.
Y2 = First year for which GHG emissions from this industrial waste landfill must be reported.
N = Number of years for which disposal and production/throughput data are both available.
Wx = Quantity of waste placed in the industrial waste landfill in year X from measurement data and/or other company records (metric tons, as received (wet weight)).
Px = Quantity of product produced or feedstock entering the process or facility in year X from measurement data and/or other company records (production units). You must use the same basis for all years in the calculation. That is, Px must be determined based on production (quantity of product produced) for all "N" years or Px must be determined based on throughput (quantity of feedstock) for all "N" years.
Where:
X = Historic year in which waste was disposed.
Wx = Calculated quantity of waste placed in the landfill in year X (metric tons).
WDF = Average waste disposal factor from Equation TT-2 of this section (metric tons per production unit).
Px = Quantity of product produced or feedstock entering the process or facility in year X from measurement data and/or other company records (production units). You must use the same basis for Px (either production only or throughput only) as used to determine WDF in Equation TT-2 of this section.
Where:
WX = Quantity of waste placed in the landfill in year X (metric tons, wet basis). This annual bulk waste disposal quantity applies for all years from "YrOpen" to "YrData" inclusive.
LFC = Capacity of the landfill used (or the total quantity of waste-in-place) at the end of the "YrData" from design drawings or engineering estimates (metric tons). For closed landfills for which waste quantity data are not available, use the landfill's design capacity.
YrData = The year prior to the year when waste disposal data are first available for all subsequent years from company records or from Equation TT-3 of this section. For landfills for which waste quantity data are not available, the year in which the landfill last received waste.
YrOpen = Year 1960 or the year in which the landfill first received waste from company records, whichever is more recent. If no data are available for estimating YrOpen for a closed landfill, use 1960 as the default "YrOpen" for the landfill.
Where:
WX = Quantity of waste placed in the landfill in year X (metric tons, wet basis). This annual bulk waste disposal quantity applies for all years for which waste quantity data are not available from company records or from Equation TT-3 of this section.
WIP = Quantity of waste in-place at the start of the reporting year from design drawings or engineering estimates (metric tons). For closed landfills for which waste in-place quantities are not available, use the landfill's design capacity.
Wmeas,n = Annual quantity of waste placed in the landfill for the nth measurement year from company records or from Equation TT-3 of this section.
YrLast = The last year, prior to the reporting year, that the landfill received waste.
YrOpen = Year 1960 or the year in which the landfill first received waste from company records, whichever is more recent. If no data are available for estimating YrOpen for a closed landfill, use 1960 as the default "YrOpen" for the landfill.
NYrData = The number of years for which annual waste disposal quantities are available from company records or from Equation TT-3 of this section from YrOpen to YrLast inclusive.
Where:
DOCbulk = Degradable organic content value for bulk historical waste placed in the landfill (mass fraction).
N = Number of different waste streams placed in the landfill.
n = Index for waste stream.
DOCave,n = Average degradable organic content value for waste stream "n" based on available measurement data (mass fraction).
Wave,n = Average annual quantity of waste stream "n" placed in the landfill for years in which waste stream-specific disposal quantities have been determined (metric tons per year, wet basis).
Where:
MG = Methane generation, adjusted for oxidation, from the landfill in the reporting year (metric tons CH4).
GCH4 = Modeled methane generation rate in reporting year from Equation TT-1 of this section (metric tons CH4).
OX = Oxidation fraction from Table HH-4 of subpart HH of this part.
40 C.F.R. §98.463