This page provides a step-by-step description of how to enter data on the methane generation and emissions from municipal solid waste (MSW) landfills as required by Subpart HH of the Greenhouse Gas Reporting Program (GHGRP).
Before entering emissions information, you must provide detailed information about your MSW landfill including whether or not your landfill has a Gas Collection System (see "Landfill Details Reporting Years" Summary Information for this Facility)
Click image to expand From the Subpart Overview page, click the OPEN button located opposite "Methane Generation and Emissions for Landfills without LFG Collection Systems."
Click image to expand This page displays a summary of the CH4 data calculated by e-GGRT. Click NEXT to move on to the "Equation HH-1 Summary and Result" page. For each equation: Equation HH-1 Summary and Result After clicking the NEXT button, you will be brought to the "Equation HH-1 Summary and Result" page. On this page, e-GGRT will calculate the annual modeled methane generation (GCH4) in metric tons per year (the output of Equation HH-1) for each waste type identified in the "Waste Characterization Information" section. e-GGRT will calculate your total annual modeled CH4 generation with Equation TT-Q by summing each waste type, 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 HH-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 HH-1), round the value to the nearest metric ton, and store the rounded value and the facility-entered unrounded value in the database.
Click image to expand 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 according to e-GGRT rounding rules, and store both the rounded and unrounded value in the database. Note that for landfills with no gas collection system, the methane generation quantity that results from the HH-5 calculation (or the value that you entered) will serve as the landfill's total methane emissions and be used for total, facility-wide emissions rollups.
Click image to expand When you have entered the information, click NEXT. This will take you to the summary page where you can click SAVE. Then click Subpart Overview to return to the Subpart Overview page.
Click image to expand Emissions Reporting Overview From the Subpart HH Overview page, click the OPEN button located opposite "Methane Generation and Emissions for Landfills with LFG Collection Systems."
Click image to expand On the first page, the following information is collected: 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 data input. Emissions Reporting Equations For each equation: 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.If there is no Gas Collection System at your Landfill:
If there is a Gas Collection System at your Landfill:
Equation HH-1 Summary and Result
After clicking the NEXT button, you will be brought to the "Equation HH-1 Summary and Result" page. On this page, e-GGRT will calculate the annual modeled methane generation (GCH4) in metric tons per year (the output of Equation HH-1) for each waste type identified in the "Waste Characterization Information" section. e-GGRT will calculate your total annual modeled CH4 generation with Equation TT-Q by summing each waste type, 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 HH-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 HH-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 according to 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-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 according to 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-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 according to e-GGRT rounding rules, 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 (HH-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 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 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.
Subpart HH Emissions Totals (When and How to Enter Your "Own Result")
After all data is entered in e-GGRT for subpart HH, e-GGRT automatically uses the greater of the two emissions equation results (Equation HH-6 or Equation HH-8) in the Subpart HH emissions totals. The reporter may override that total if, due to site specific conditions at the landfills, the other equation result is deemed to more accurately reflects total methane emissions at the landfill.
To override the Subpart HH emissions totals:
- Go to the Facility Overview page (click on the blue box at the bottom left corner of the Subpart Overview page)
- Click on "VIEW GHG DETAILS" at the bottom of the blue box with the calculators on the upper right side of the page
- Click "Edit result(s)" under the table titled "GHGDETAILS (source categories subparts C-HH)"
- Choose the row for Subpart HH CH4 and enter the value of the more accurate equation result in the "Own Result" box.
- Click "SAVE" at the bottom of the page
See Also
Screen Errors
Using e-GGRT to Prepare Your Subpart HH Report
Subpart HH Summary Information for this Facility
Subpart HH Waste Information
Subpart Validation Report