WAC 173-408-980. Appendix I

1.0 Calculate Heat Input Capacity Equation 1 Where: Collection Efficiency = The landfill gas collection efficiency in percent (%), which is 75 percent. GHV (Gross Heating Value) = Gross heating value of methane, which is 1,012 1 in units of British thermal units per standard cubic feet, or Btu/scf. Where: Collection Efficiency = The landfill gas collection efficiency in percent (%), which is 75 percent. GHV (Gross Heating Value) = Gross heating value of methane, which is 1,012 1 in units of British thermal units per standard cubic feet, or Btu/scf. 1 Landfill Methane Outreach Program (LMOP) Interactive Conversion Tool 2.0 Methane Gas Generation CH 4 Generation is calculated using the following equation: Equation 2 Where: CH 4 Generation = CH 4 generated in the inventory year (Mg of CH 4 ). FCH 4 = Fraction of decomposing carbon converted into CH 4 (Default = 0.5). 2 ANDOC year-start = ANDOC in place at the beginning of the inventory year. ANDOC deposited-last year = ANDOC deposited during the previous inventory year. ANDOC deposited-same year = ANDOC deposited during the inventory year. Where: CH 4 Generation = CH 4 generated in the inventory year (Mg of CH 4 ). FCH 4 = Fraction of decomposing carbon converted into CH 4 (Default = 0.5). 2 ANDOC year-start = ANDOC in place at the beginning of the inventory year. ANDOC deposited-last year = ANDOC deposited during the previous inventory year. ANDOC deposited-same year = ANDOC deposited during the inventory year. 2 2006 IPCC Guidelines for National Greenhouse Gas Inventories 3.0 To Convert Methane Generated from Mg of CH 4 to SCFM Equation 3 4.0 Define ANDOC% Equation 4 Where: WIPFRAC i = Fraction of the i th component in the waste in place. TDOC i = Total Degradable Organic Carbon fraction of the i th waste component (Mg of that component/Mg of Total waste in place). DANF i = Decomposable Anaerobic Fraction of the i th waste component, that fraction capable of decomposition in anaerobic conditions (Mg of decomposable carbon for that component/Mg TDOC i for that component). Where: WIPFRAC i = Fraction of the i th component in the waste in place. TDOC i = Total Degradable Organic Carbon fraction of the i th waste component (Mg of that component/Mg of Total waste in place). DANF i = Decomposable Anaerobic Fraction of the i th waste component, that fraction capable of decomposition in anaerobic conditions (Mg of decomposable carbon for that component/Mg TDOC i for that component). 5.0 Define ANDOC Equation 5 Where: ANDOC = Anaerobically Degradable Organic Carbon, carbon that is capable of decomposition in an anaerobic environment (Mg of carbon). WIP = Waste in place estimate of all the landfilled waste (wet weight) as reported to Ecology's Solid Waste Management Program (tons). Where: ANDOC = Anaerobically Degradable Organic Carbon, carbon that is capable of decomposition in an anaerobic environment (Mg of carbon). WIP = Waste in place estimate of all the landfilled waste (wet weight) as reported to Ecology's Solid Waste Management Program (tons). 6.0 Calculate ANDOC year-end Equation 6 Where: ANDOC year-end = ANDOC remaining undecomposed at the end of the inventory year. ANDOC year-start = ANDOC in place at the beginning of the inventory year. ANDOC deposited-last year = ANDOC deposited during the previous inventory year. ANDOC deposited-same year = ANDOC deposited during the inventory year. M = Assumed delay before newly deposited waste begins to undergo anaerobic decomposition (Months, Default = 6). k = Assumed rate constant for anaerobic decomposition; k = ln2/half-life (years); half-life is the number of years required for half of the original mass of carbon to degrade. Where: ANDOC year-end = ANDOC remaining undecomposed at the end of the inventory year. ANDOC year-start = ANDOC in place at the beginning of the inventory year. ANDOC deposited-last year = ANDOC deposited during the previous inventory year. ANDOC deposited-same year = ANDOC deposited during the inventory year. M = Assumed delay before newly deposited waste begins to undergo anaerobic decomposition (Months, Default = 6). k = Assumed rate constant for anaerobic decomposition; k = ln2/half-life (years); half-life is the number of years required for half of the original mass of carbon to degrade. Table 1 lists the accepted constant values for the anaerobic decomposition rate ("k"). Table 1: K Values K for Average Rainfall (Inches/Year) Inches Rain <20 20-40 >40 K Value 0.02 0.038 0.057 K for Average Rainfall (Inches/Year) Inches Rain <20 20-40 >40 K Value 0.02 0.038 0.057