This page provides a step-by-step description of how to enter and edit information on the methane generated and the emission in industrial waste landfills as required by Subpart TT of the Greenhouse Gas Reporting Program (GHGRP).
Subpart TT requires industrial waste landfills to report methane (CH4) generation and emissions quantities. First, provide the information requested in the Landfill Details page and e-GGRT will determine what additional information is required for reporting based on the information that you provide about your landfill. Next, identify each waste stream placed into the landfill and provide the associated information requested by e-GGRT.
Before entering emissions information, you must provide detailed information about your industrial waste landfill including whether or not your landfill has a Gas Collection System (see “Landfill Details for this Facility”).
If there is no Gas Collection System at your Landfill
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From the Subpart Overview page, click the OPEN button located opposite “Methane Generation and Emissions for Landfills without LFG Collection Systems.”
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This page displays a summary of the CH4 data calculated by e-GGRT. Click NEXT to move on to the "Equation TT-1 Summary and Result" page.
For each equation:
- Hover over an element in the equation to read a definition of that element as needed.
- On these equation pages, you will have the option to use the result calculated by e-GGRT or enter your own result by clicking on one of the following radio buttons at the bottom of the page:
- "Use the calculated result rounded"
- "Enter my own result (value will be rounded)"
Equation TT-1 Summary and Result
On this page, e-GGRT will calculate the modeled annual methane generation (GCH4) in metric tons per year (the output of Equation TT-1) for each waste stream identified. e-GGRT will calculate your total annual modeled CH4 generation with Equation TT-Q by summing each waste stream-specific Equation TT-1 result, rounding the value according to e-GGRT rounding rules, and storing both the rounded and unrounded values in the database.
e-GGRT will also allow you to report the modeled annual methane generation (GCH4) in metric tons per year (the output of Equation TT-1). To enter a value, click the "Enter my own result" button and enter your result in the box that shows up below the question. e-GGRT will store your estimated value of modeled annual methane generation (GCH4) in metric tons per year (the output of Equation TT-1), round the value to the nearest metric ton, and store the rounded value and the facility-entered unrounded value in the database.
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Click NEXT to move on to the "Equation TT-6 Summary and Result" page.
Equation TT-6 Summary and Result
On this page, e-GGRT will calculate the landfill's annual methane generation adjusted for oxidation using Equation TT-6. e-GGRT will then round the result according to e-GGRT rounding rules and store both the rounded and unrounded values in the database.
You may use this result or enter your own value by clicking the "Enter my own result" button. Enter your result in the box that shows up below the question. e-GGRT will store your estimated value, round the value to the nearest metric ton (integer), and store both the rounded and unrounded value in the database.
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When you have entered the information, click FINISHED. This will take you to the summary page where you can click SAVE. Then click Subpart Overview to return to the Subpart Overview page.
If there is a Gas Collection System at your Landfill
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Emissions Reporting Overview
From the Subpart TT Overview page, click the OPEN button located opposite “Methane Generation and Emissions for Landfills with LFG Collection Systems.”
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On the first page, the following information is collected:
- Total volumetric flow of landfill gas collected for destruction (in scf)
- Indicate if a missing data procedure was used to determine the volume of the landfill gas collected for destruction (information about appropriate procedures for estimating missing data is found in §98.345.
- If a missing data procedure was used, enter the number of days when substitute data were used to determine the volume of the landfill gas collected for destruction
- Annual average concentration of CH4 of landfill gas collected for destruction
- Indicate if a missing data procedure was used to determine the concentration of CH4 in landfill gas collected for destruction (information about appropriate procedures for estimating missing data are found in §98.345.
- If a missing data procedure was used and the CH4 concentration is monitored continuously, enter the number of days substitute data were used to determine the annual average CH4 concentration of landfill gas collected for destruction
- If a missing data procedure was used and the CH4 concentration is monitored weekly, enter the number of weeks substitute data were used to determine the annual average CH4 concentration of landfill gas collected for destruction
- In the case of multiple measurement locations, you may enter values for both days and weeks when CH4 concentration is measured continuously at some locations and weekly at others.
- Indicate (yes/no) if temperature was incorporated into internal calculations run by the collection system’s monitoring equipment
- If temperature was not incorporated into the internal calculations run by the collection system’s monitoring equipment, enter the average monthly temperature at which the landfill gas flow was measured (in degrees Rankine) for each month of the reporting year.
- Indicate (yes/no) if pressure was incorporated into internal calculations run by the collection system’s monitoring equipment
- If pressure was not incorporated into the internal calculations run by the collection system’s monitoring equipment, enter the average monthly pressure at which the landfill gas flow was measured (in atmospheres) for each month of the reporting year.
- Indicate whether landfill gas flow was measured on a wet or a dry basis and whether CH4 concentration was measured on a wet or a dry basis
- If landfill gas flow was measured on a wet basis and CH4 concentration was measured on a dry basis, or gas flow was measured on a dry basis and CH4 concentration was measured on a wet basis, provide the monthly average moisture content (expressed as a decimal fraction) for each month of the reporting year.
- Indicate whether landfill gas destruction occurred at the facility (on-site), off-site, or both. If any landfill gas destruction occurred at the facility (you answered 'at the facility' or 'both' to the previous questions), provide the following information:
- Indicate if a back-up destruction device is present at the facility.
- The annual operating hours for the primary destruction device.
- The annual operating hours for the back-up destruction device if present.
- The destruction efficiency used in Equations HH-6 and HH-8 as a decimal fraction.
When you have entered the information, click SAVE. You will be brought back to the top of the “GHG Reporting” page at which time you may check over the information entered. When you have completed your check, click NEXT to be taken to the next page for equation information.
Emissions Reporting Equations
Landfills that have a landfill gas collection system are required to report two sets of CH4 generation and CH4 emissions values. Many of the equations for deriving these values for Industrial Waste Landfills are the same as those used by Municipal Solid Waste Landfills under Subpart HH, per §98.463(b)(3) of the rule. The Subpart HH equations are referenced below, as appropriate. CH4 generation, adjusted for oxidation must be reported as calculated using both Equations TT-6 and HH-7, and CH4 emissions must be calculated using both Equations HH-6 and HH-8.
For each equation:
- Hover over an element in the equation to read a definition of that element as needed.
- The equation may be calculated by e-GGRT itself or by using a spreadsheet tool provided. Spreadsheets are also available for calculating inputs to the equations. For example, use the Subpart TT-1, TT-2/TT-3, and TT-4a/TT-4b spreadsheets to calculate inputs to Equation TT-6 as needed.
- If a spreadsheet tool is available for download on the page, download the spreadsheet tool by clicking the link labeled “Use TT-n or HH-n spreadsheet to calculate.”
- Fill in the spreadsheet completely using the instructions provided in the tool.
- After completing the spreadsheet, copy the value of CH4 calculated by the spreadsheet to this page in the corresponding box.
- On most equation pages, you will have the option to use the result calculated by e-GGRT or enter your own result by clicking on one of the following radio buttons at the bottom of the page:
- "Use the calculated result rounded"
- "Enter my own result (value will be rounded)"
Subpart HH is the subpart for Municipal Solid Waste landfills. The rule directly references Subpart HH for all monitoring requirements and calculations related to landfill gas collection systems at industrial waste landfills. If an industrial waste landfill has a gas collection system, the subpart HH equations must be followed to complete the methane generation and emissions calculations. The results of these calculations are then entered into the subpart TT module of e-GGRT.
There will be a series of pages for these equations. You will have to click the NEXT button to get to the next equation page or you can use the links in the gray box at the top of each page to hop from equation to equation.
Equation TT-1 Summary and Result
After clicking the NEXT button from the emissions reporting overview page, you will be brought to the "Equation TT-1 Summary and Result" page. On this page, e-GGRT will calculate the modeled annual methane generation (GCH4) in metric tons per year (the output of Equation TT-1) for each waste stream identified. e-GGRT will calculate your total annual modeled CH4 generation with Equation TT-Q by summing each waste stream-specific Equation TT-1 result, rounding the value according to e-GGRT rounding rules, and storing both the rounded and unrounded values in the database.
e-GGRT will also allow you to report the modeled annual methane generation (GCH4) in metric tons per year (the output of Equation TT-1). To enter a value, click the "Enter my own result" button and enter your result in the box that shows up below the question. e-GGRT will store your estimated value of modeled annual methane generation (GCH4) in metric tons per year (the output of Equation TT-1), round the value to the nearest metric ton, and store the rounded value and the facility-entered unrounded value in the database.
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Click NEXT to move on to the "Equation in Table HH-3 Summary and Result" page.
Equation in Table HH-3 Summary and Result
On this page, e-GGRT will calculate the estimated gas collection efficiency ("CEave1") using the equation provided within Table HH-3 to Subpart HH of Part 98 (Landfill Gas Collection Efficiencies) and round the result to two digits right of the decimal. If you have filled in the "Estimated Waste Depths" page, e-GGRT will pre-populate the "Equation in Table HH-3 Summary and Result" page for you and show a calculated result.
You may use this result or enter your own value by clicking the "Enter my own result" button. Enter your result in the box that shows up below the question. e-GGRT will store your estimated value, round the value to two digits to the right of the decimal, and store both the rounded and unrounded value in the database.
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Click NEXT to move on to the "Equation HH-4 Summary and Result" page.
Equation HH-4 Summary and Result
On this page, you will be required to provide the annual quantity in metric tons of recovered CH4 calculated using Equation HH-4. Use the calculation spreadsheet link provided under the data entry box to do this calculation, and then enter the value into the box highlighted in red. e-GGRT will store your estimated value, round the value to the nearest metric ton, and store both the rounded and unrounded value in the database.
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Click NEXT to move on to the "Equation HH-5 Summary and Result" page.
Equation HH-5 Summary and Result
On this page, e-GGRT will calculate the landfill's annual methane generation adjusted for oxidation using Equation HH-5. e-GGRT will then round the result according to e-GGRT rounding rules and store both the rounded and unrounded values in the database.
You may use this result or enter your own value by clicking the "Enter my own result" button. Enter your result in the box that shows up below the question. e-GGRT will store your estimated value, round the value to the nearest metric ton (integer), and store both the rounded and unrounded value in the database.
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Click NEXT to move on to the "Equation HH-6 Summary and Result" page.
Equation HH-6 Summary and Result
On this page, e-GGRT will calculate the landfill's annual methane emissions (the output of Equation HH-6), round the value according to e-GGRT rounding rules, and store both the rounded and unrounded values in the database.
You may use this result or enter your own value by clicking the "Enter my own result" button. Enter your result in the box that shows up below the question. e-GGRT will store your estimated value, round the value to the nearest metric ton (integer), and store both the rounded and unrounded value in the database.
e-GGRT will also use your annual report as an indication of which of the modeled (TT-1) or measured (HH-4) methane generation value (GCH4) was used in calculation Equation HH-6.
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Click NEXT to move on to the "Equation HH-7 Summary and Result" page.
Equation HH-7 Summary and Result
On this page, e-GGRT will calculate the landfill's annual methane generation adjusted for oxidation (output of Equation HH-7), round the value according to e-GGRT rounding rules, and store both the rounded and unrounded values in the database.
You may use this result or enter your own value by clicking the "Enter my own result" button. Enter your result in the box that shows up below the question. e-GGRT will store your estimated value, round the value according e-GGRT rounding rules, and store both the rounded and unrounded value in the database.
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Click NEXT to move on to the "Equation HH-8 Summary and Result" page.
Equation HH-8 Summary and Result
On this page, e-GGRT will calculate the landfill's annual methane emissions (output of Equation HH-8), round the value according to e-GGRT rounding rules, and store both the rounded and unrounded values in the database.
You may use this result or enter your own value by clicking the "Enter my own result" button. Enter your result in the box that shows up below the question. e-GGRT will store your estimated value, round the value according e-GGRT rounding rules, and store both the rounded and unrounded value in the database.
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Note for Equations HH-6, HH-7, and HH-8: The calculation spreadsheet file for Equations HH-6, HH-7, and HH-8 has several tabs which are appropriate for different numbers of destruction devices and monitoring/measurement locations at the landfill. Please consult the “Using Subpart HH Calculation Spreadsheets" help screens to ensure appropriate use of the various tabs.
When finished with the equation pages, click FINISHED on the "Equation HH-8 Summary and Result" page. This will bring you back to the emissions overview information page. You will see that the "Summary and Results" section of that page is filled in with the information stored from the equation pages.
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You will be allowed to elect to use either the rounded result of Equation HH-6 (as calculated and rounded by e-GGRT, unless entered by the user) or the rounded result of Equation HH-8 (as calculated and rounded by e-GGRT, unless entered by the user) to roll up into your total CO{~}2~e emissions from facility subparts as required by 98.3(c)(4)(i). If you make no election, e-GGRT will use the larger of the two rounded values.
When you are satisfied with the information shown, click SAVE. You will be brought back to the top of the emissions overview information page at which time you may check over the information entered. When you have completed your check, click Subpart Overview to return to the Subpart Overview page.
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From the Subpart Overview page, press the OPEN button located opposite “Estimated Waste Depths.”
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For landfills with a gas collection system in place, the following information must be entered on the estimate waste depths (in meters) and surface areas (in square meters) for each area below (as listed in Table HH-3):
- A1: Depth and surface area of area with no waste in place. Note: In many cases, the depth of area with no waste in place will be zero.
- A2: Depth and surface area of area without active gas collection, regardless of cover type.
- A3: Depth and surface area of area with daily soil cover and active gas collection.
- A4: Depth and surface area of area with an intermediate soil cover, or a final soil cover not meeting the criteria for A5.
- A5: Depth and surface area of area with a final soil cover of 3 feet or thicker of clay and/or geomembrane cover system and active gas collection.
When you have entered the information, click SAVE. You will be brought back to the top of the “GHG Reporting” page at which time you may check over the information you entered. When you have completed your check, click Subpart Overview to return to the Subpart Overview page.