Q855. How does a user create fDest in e-GGRT such that it appears on the page “LANDFILL GAS MEASURMENT LOCATIONS” with the user’s desired fractional value?

A855. If one destruction device is associated with one measurement location, follow these steps to create fDest and to define its value: Go to the page “Subpart Overview>>Methane Generation and Emissions>>Equation HH-4 Landfill Gas Measurement Locations”.  Under Landfill Gas Measurement Locations, select “+ Add a Measurement Location”; this selection will then ask the user to provide a name or ID for the measurement location, description, annual quantity of recovered gas, and annual operating hours for the measurement location.  On this same page, under the heading Destruction Devices, select “+ Add a Destruction Device”; this selection will then ask the user to provide a name or ID for the destruction device; the annual operating hours of the destruction device; and the destruction efficiency fraction. e-GGRT will then divide the annual operating hours of the destruction device by the annual operating hours of the measurement location to calculate fDest. Note, fDest must always be a fraction, therefore, the annual operating hours of the destruction device cannot be more than the annual operating hours of the measurement location.  Also note, if more than one destruction device is associated with a given measurement location, the same steps are followed to create fDest for each device, however, e-GGRT will use fDest equals “1” for each device regardless of the annual operating hours the user enters in for each device and the measurement location. If the user would like to calculate an average fDest for the measurement location (as the rule notes to do) one can be calculated using the calculation spreadsheets for multiple destruction devices provided at: Optional Calculation Spreadsheet Instructions. The average fDest can then be used in the calculation spreadsheets for Equations HH-6 and HH-8, and then these values may be entered into e-GGRT as the user’s own results for HH-6 and HH-8.