A389. {longname} Q389. Within e-GGRT, how would a landfill handle multiple destruction devices including a portion of the gas sent off-site for destruction? Is there a way to add multiple on-site destruction devices for a gas system?
{longname}

A389. e-GGRT  does not collect data for individual destruction devices. e-GGRT does  ask if destruction occurs at the facility, off-site, or both. All  reporting in e-GGRT for landfills is done at the facility level.

The following is provided to assist in performing the calculations  and reporting certain elements when several destruction devices are used  routinely. e\- GGRT provides a means to indicate if a back-up  destruction devise is used; this is not what is being considered here as  multiple destruction devices. Two basic scenarios are considered: 1)  flow and methane content are measured at a single central location and  the gas is then piped to different destruction devices (either all  on-site or on-site and off-site), but the flow rate per device is not  measured; 2) flow and methane content are measured separately for each  on-site destruction device and, if applicable, gas sent off-site for  destruction. Further information can be found via the e-GGRT Help link  in the left-hand margin of e-GGRT. Go to _Using Subpart HH Calculation Spreadsheets and then to Using the Equation HH-6, HH-7, and HH-8 Calculation Spreadsheet_.

Scenario 1, Central measurement location.
Determine single value of R directly from measurement data using Equation HH-4.
Determine single value for DE using the average destruction efficiency of all destruction devices.
Determine f_Dest as the average annual hours for which the routinely  used destruction devices were operated divided by the hours the  collection system operated (presumably 8760 hour); see equation below.
Determine single value for CE using Table HH-3 considering the entire landfill facility.
Determine a single value of f_Rec based on the annual operating hours of the collection system.
Equations HH-5 through HH-8 can be used directly given the parameters determined above.
Other e-GGRT reporting parameters (annual volume of gas, annual average  methane concentration and number of number of days/weeks missing data  procedure were used) are straight forward under this scenario.


!Q389scenario1.jpg|border=0!

Scenario 2, Measurement at different locations.
Determine a value of R using Equation HH-4 for each destruction device (monitoring location).
Determine a value of DE for each destruction device
Determine a value of f_Dest for each destruction device based on the  annual hours for which the specific destruction device was operating  divided by the number of hours flow was sent to the destruction device  (or the annual hours the collection system operated that is associated  with that destruction device)
Determine single value for CE using Table HH-3 considering the entire landfill facility.
If separate gas collection systems are operated for different  destruction devices, determine a value of f_Rec for each destruction  device-specific gas collection system; otherwise, determine a single  value of f_Rec based on the annual operating hours of the collection  system.
Calculations for Equation HH-5 are not dependent on destruction devices;  the equations below can be used to determine the reporting quantities  for Equations HH-6 through HH-8.
Report annual volume of gas as the cumulative volume of gas collected across all measurement locations.
Report the annual average CH4 concentration as the direct arithmetic  average of the measured concentrations across all measurement locations  (do not use a flow weighted average concentration).
Report the missing data times as the cumulative number of instances that  missing data procedures were used across all measurement locations.  \[Note that currently the system only allows you to report missing  concentration data on a daily or weekly basis. We will be modifying the  system to allow an entry for both daily and weekly in the case that CH4  concentration is monitored daily for certain destruction devices and  weekly for others (or for gas sent off\- site).\]

!Q389scenario2a.jpg|border=0!

Calculate CH4 generation and CH4 emissions using measured CH4  recovery and estimated gas collection efficiency and Equations HH-7 and  HH-8 of section 98.343(c)(3)(ii).

!Q389scenario2b.jpg|border=0!

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Source: This question and answer was derived from a Legacy FAQ\\

Approval / Publishing History: Version 1\\ 

Expiration : none\\ 

Relevant Subparts:   Subpart HH

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