# \ \ d? PRO*^ 2020 National Emissions Inventory Technical Support Document: Oil and Gas Exploration and Production ------- ------- EP A-454/R-23 -001 m March 2023 2020 National Emissions Inventory Technical Support Document: Oil and Gas Exploration and Production U.S. Environmental Protection Agency Office of Air Quality Planning and Standards Air Quality Assessment Division Research Triangle Park, NC ------- Contents List of Tables i 13 Oil and Gas Exploration and Production 13-1 13.1 Sector Descriptions and Overview 13-1 13.2 Sources of data 13-5 13.3 EPA-developed estimates 13-7 13.3.1 Activity data 13-8 13.3.2 FIPS changes and Temperature changes 13-8 13.3.3 Basin factors 13-8 13.3.4 Emission factors 13-9 13.3.5 Methodology Updates 13-9 13.3.6 Point source subtraction 13-9 13.3.7 Other State-specific correspondence 13-9 13.4 References Error! Bookmark not defined. List of Tables Table 13-1: Point and Nonpoint SCCs used for the Oil and Gas Production Sector 13-1 Table 13-2: Data Source for Oil and Gas Production Data in the 2020 NEI 13-6 List of Figures Figure 13-1: Data source for Oil and Gas emissions 13-5 l ------- 13 Oil and Gas Exploration and Production 13.1 Sector Descriptions and Overview This sector includes processes associated with the exploration and drilling at oil, gas, and coal bed methane (CBM) wells and the equipment used at the well sites to extract the product from the well and deliver it to a central collection point or processing facility. Table 13-1 lists the processes below with their corresponding SCCs; the SCCs used by EPA to estimate nonpoint emissions are marked in second column. Note also that the SCCs in this list are only the SCCs that either the EPA used or the submitting State agencies used in this NEI. All of the SCCs that the EPA oil and gas tool uses are nonpoint SCCs. Lastly, Y marked with an asterisk (Y*) denote SCCs that are produced by the tool, but only for the state of Pennsylvania, by special request. Table 13-1: Point and Nonpoint SCCs used for the Oil and Gas Production Sector Data Category EPA uses see SCC Description (Abbreviated) Nonpoint Y 2310000220 All Processes; Drill Rigs Nonpoint 2310000230 All Processes; Workover Rigs Nonpoint Y 2310000551 All Processes; Produced Water from CBM Wells Nonpoint Y 2310000552 All Processes; Produced Water from Gas Wells Nonpoint Y 2310000553 All Processes; Produced Water from Oil Wells Nonpoint Y 2310000660 All Processes; Hydraulic Fracturing Engines Nonpoint 2310001000 All Processes: On-shore; Total: All Processes Nonpoint 2310002000 Off-Shore Oil and Gas Production; Total: All Processes Nonpoint 2310002401 Off-Shore Oil and Gas Production; Pneumatic Pumps: Gas And Oil Wells Nonpoint 2310002411 Off-Shore Oil and Gas Production; Pressure/Level Controllers Nonpoint 2310002421 Off-Shore Oil and Gas Production; Cold Vents Nonpoint Y 2310010100 Crude Petroleum; Oil Well Heaters Nonpoint Y 2310010200 Crude Petroleum; Oil Well Tanks - Flashing & Standing /Working /Breathing Nonpoint Y 2310010300 Crude Petroleum; Oil Well Pneumatic Devices Nonpoint 2310010700 Crude Petroleum; Oil Well Fugitives Nonpoint Y 2310011001 On-Shore Oil Production; Associated Gas Venting Nonpoint 2310011020 On-Shore Oil Production; Storage Tanks: Crude Oil Nonpoint 2310011100 On-Shore Oil Production; Heater Treater Nonpoint Y 2310011201 On-Shore Oil Production; Tank Truck/Railcar Loading: Crude Oil Nonpoint 2310011450 On-Shore Oil Production; Wellhead Nonpoint 2310011500 On-Shore Oil Production; Fugitives: All Processes Nonpoint Y 2310011501 On-Shore Oil Production; Fugitives: Connectors Nonpoint Y 2310011502 On-Shore Oil Production; Fugitives: Flanges 13-1 ------- Nonpoint Y 2310011503 On-Shore Oil Production; Fugitives: Open Ended Lines Nonpoint 2310011504 On-Shore Oil Production; Fugitives: Pumps Nonpoint Y 2310011505 On-Shore Oil Production; Fugitives: Valves Nonpoint 2310011506 On-Shore Oil Production; Fugitives: Other Nonpoint Y 2310011600 On-Shore Oil Production; Artificial Lift Engines Nonpoint 2310012000 Off-Shore Oil Production; Total: All Processes Nonpoint 2310012020 Off-Shore Oil Production; Storage Tanks: Crude Oil Nonpoint 2310012516 Off-Shore Oil Production; Fugitives, Other: Oil Nonpoint 2310012526 Off-Shore Oil Production; Fugitives, Other: Oil/Water Nonpoint y* 2310020600 Natural Gas; Compressor Engines Nonpoint Y 2310021010 On-Shore Gas Production; Storage Tanks: Condensate Nonpoint 2310021011 On-Shore Gas Production; Condensate Tank Flaring Nonpoint Y 2310021030 On-Shore Gas Production; Tank Truck/Railcar Loading: Condensate Nonpoint Y 2310021100 On-Shore Gas Production; Gas Well Heaters On-Shore Gas Production; Natural Gas Fired 2Cycle Lean Burn Nonpoint 2310021101 Compressor Engines < 50 HP On-Shore Gas Production; Natural Gas Fired 2Cycle Lean Burn Nonpoint Y 2310021102 Compressor Engines 50 To 499 HP On-Shore Gas Production; Natural Gas Fired 2Cycle Lean Burn Nonpoint 2310021103 Compressor Engines 500+ HP On-Shore Gas Production; Total: All Natural Gas Fired 2Cycle Lean Nonpoint 2310021109 Burn Compressor Engines On-Shore Gas Production; Natural Gas Fired 4Cycle Lean Burn Nonpoint 2310021201 Compressor Engines <50 HP On-Shore Gas Production; Natural Gas Fired 4Cycle Lean Burn Nonpoint Y 2310021202 Compressor Engines 50 To 499 HP On-Shore Gas Production; Natural Gas Fired 4Cycle Lean Burn Nonpoint 2310021203 Compressor Engines 500+ HP On-Shore Gas Production; Total: All Natural Gas Fired 4Cycle Lean Nonpoint 2310021209 Burn Compressor Engines Nonpoint Y 2310021251 On-Shore Gas Production; Lateral Compressors 4 Cycle Lean Burn Nonpoint Y 2310021300 On-Shore Gas Production; Gas Well Pneumatic Devices On-Shore Gas Production; Natural Gas Fired 4Cycle Rich Burn Nonpoint 2310021301 Compressor Engines <50 HP On-Shore Gas Production; Natural Gas Fired 4Cycle Rich Burn Nonpoint Y 2310021302 Compressor Engines 50 To 499 HP On-Shore Gas Production; Natural Gas Fired 4Cycle Rich Burn Nonpoint 2310021303 Compressor Engines 500+ HP On-Shore Gas Production; Total: All Natural Gas Fired 4Cycle Rich Nonpoint 2310021309 Burn Compressor Engines Nonpoint Y 2310021310 On-Shore Gas Production; Gas Well Pneumatic Pumps Nonpoint Y 2310021351 On-Shore Gas Production; Lateral Compressors 4 Cycle Rich Burn Nonpoint Y 2310021400 On-Shore Gas Production; Gas Well Dehydrators 13-2 ------- On-Shore Gas Production; Nat Gas Fired 4Cycle Rich Burn Nonpoint 2310021401 Compressor Engines <50 HP w/NSCR On-Shore Gas Production; Nat Gas Fired 4Cycle Rich Burn Nonpoint 2310021402 Compressor Engines 50 To 499 HP w/NSCR On-Shore Gas Production; Nat Gas Fired 4Cycle Rich Burn Nonpoint 2310021403 Compressor Engines 500+ HP w/NSCR Nonpoint 2310021412 On-Shore Gas Production; Gas Well Dehydrators/Reboiler Nonpoint 2310021450 On-Shore Gas Production; Wellhead Nonpoint Y 2310021500 On-Shore Gas Production; Gas Well Completion - Flaring Nonpoint Y 2310021501 On-Shore Gas Production; Fugitives: Connectors Nonpoint Y 2310021502 On-Shore Gas Production; Fugitives: Flanges Nonpoint Y 2310021503 On-Shore Gas Production; Fugitives: Open Ended Lines Nonpoint 2310021504 On-Shore Gas Production; Fugitives: Pumps Nonpoint Y 2310021505 On-Shore Gas Production; Fugitives: Valves Nonpoint Y 2310021506 On-Shore Gas Production; Fugitives: Other Nonpoint 2310021509 On-Shore Gas Production; Fugitives: All Processes Nonpoint 2310021600 On-Shore Gas Production; Gas Well Venting Nonpoint 2310021602 On-Shore Gas Production; Gas Well Venting - Recompletions Nonpoint Y 2310021603 On-Shore Gas Production; Gas Well Venting - Blowdowns Nonpoint 2310021700 On-Shore Gas Production; Miscellaneous Engines Nonpoint Y 2310021801 On-Shore Gas Production; Pipeline Blowdowns and Pigging Nonpoint 2310021802 On-Shore Gas Production; Pipeline Leaks On-Shore Gas Production; Midstream gas venting for maintenance, Nonpoint 2310021803 startup, shutdown, or malfunction Nonpoint 2310022000 Off-Shore Gas Production; Total: All Processes Nonpoint 2310022010 Off-Shore Gas Production; Storage Tanks: Condensate Nonpoint 2310022051 Off-Shore Gas Production; Turbines: Natural Gas Nonpoint 2310022090 Off-Shore Gas Production; Boilers/Heaters: Natural Gas Nonpoint 2310022105 Off-Shore Gas Production; Diesel Engines Nonpoint 2310022300 Off-Shore Gas Production; Compressor Engines: 4Cycle Rich Nonpoint 2310022420 Off-Shore Gas Production; Dehydrator Nonpoint 2310022506 Off-Shore Gas Production; Fugitives, Other: Gas Nonpoint Y 2310023000 Coal Bed Methane Natural Gas; Dewatering Pump Engines Nonpoint Y 2310023010 Coal Bed Methane Natural Gas; Storage Tanks: Condensate Coal Bed Methane Natural Gas; Tank Truck/Railcar Loading: Nonpoint Y 2310023030 Condensate Nonpoint Y 2310023100 Coal Bed Methane Natural Gas; CBM Well Heaters Coal Bed Methane Natural Gas; CBM Fired 2Cycle Lean Burn Nonpoint Y 2310023102 Compressor Engines 50 To 499 HP Coal Bed Methane Natural Gas; CBM Fired 4Cycle Lean Burn Nonpoint Y 2310023202 Compressor Engines 50 To 499 HP Coal Bed Methane Natural Gas; Lateral Compressors 4 Cycle Lean Nonpoint Y 2310023251 Burn 13-3 ------- Nonpoint Y 2310023300 Coal Bed Methane Natural Gas; Pneumatic Devices Coal Bed Methane Natural Gas; CBM Fired 4Cycle Rich Burn Nonpoint Y 2310023302 Compressor Engines 50 To 499 HP Nonpoint Y 2310023310 Coal Bed Methane Natural Gas; Pneumatic Pumps Coal Bed Methane Natural Gas; Lateral Compressors 4 Cycle Rich Nonpoint Y 2310023351 Burn Nonpoint Y 2310023400 Coal Bed Methane Natural Gas; Dehydrators Nonpoint 2310023401 Coal Bed Methane Natural Gas; Dehydrators/Reboiler Nonpoint 2310023509 Coal Bed Methane Natural Gas; Fugitives Nonpoint Y 2310023511 Coal Bed Methane Natural Gas; Fugitives: Connectors Nonpoint Y 2310023512 Coal Bed Methane Natural Gas; Fugitives: Flanges Nonpoint Y 2310023513 Coal Bed Methane Natural Gas; Fugitives: Open Ended Lines Nonpoint Y 2310023515 Coal Bed Methane Natural Gas; Fugitives: Valves Nonpoint Y 2310023516 Coal Bed Methane Natural Gas; Fugitives: Other Coal Bed Methane Natural Gas; CBM Well Completion: All Nonpoint Y 2310023600 Processes Nonpoint Y 2310023603 Coal Bed Methane Natural Gas; CBM Well Venting - Blowdowns Nonpoint Y 2310023606 Coal Bed Methane Natural Gas; Mud Degassing Natural Gas Liquids: Gas Well Tanks - Flashing & Nonpoint 2310030220 Standing/Working/Breathing, Controlled Nonpoint 2310030300 Natural Gas Liquids; Gas Well Water Tank Losses Nonpoint 2310030400 Natural Gas Liquids; Truck Loading Nonpoint Y 2310111100 On-Shore Oil Exploration; Mud Degassing Nonpoint Y 2310111401 On-Shore Oil Exploration; Oil Well Pneumatic Pumps Nonpoint Y 2310111700 On-Shore Oil Exploration; Oil Well Completion: All Processes Nonpoint 2310111701 On-Shore Oil Exploration; Oil Well Completion: Flaring Nonpoint 2310112401 Off-Shore Oil Exploration; Oil Well Pneumatic Pumps Nonpoint Y 2310121100 On-Shore Gas Exploration; Mud Degassing Nonpoint Y 2310121401 On-Shore Gas Exploration; Gas Well Pneumatic Pumps Nonpoint Y 2310121700 On-Shore Gas Exploration; Gas Well Completion: All Processes Nonpoint 2310122000 Off-Shore Gas Exploration; All Processes Nonpoint Y* 2310300220 All Processes - Conventional; Drill Rigs On-Shore Gas Production - Conventional; Storage Tanks: Nonpoint Y* 2310321010 Condensate Nonpoint Y* 2310321100 On-Shore Gas Production - Conventional; Gas Well Heaters Nonpoint y* 2310321400 On-Shore Gas Production - Conventional; Gas Well Dehydrators On-Shore Gas Production - Conventional; Gas Well Venting - Nonpoint Y* 2310321603 Blowdowns Nonpoint Y* 2310400220 All Processes - Unconventional; Drill Rigs On-Shore Gas Production - Unconventional; Storage Tanks: Nonpoint Y* 2310421010 Condensate Nonpoint Y* 2310421100 On-Shore Gas Production - Unconventional; Gas Well Heaters 13-4 ------- Nonpoint Y* 2310421400 On-Shore Gas Production - Unconventional; Gas Well Dehydrators Nonpoint Y* 2310421603 On-Shore Gas Production - Unconventional; Gas Well Venting - Slowdowns 13.2 Sources of data For the nonpoint data category, S/L/Ts have four options for providing data to the NEI for the Oil and Gas Production Sector. They may: 1) accept the tool with the defaults populated in the tool by EPA, 2) choose to provide EPA with input data to incorporate in the tool, 3) run the tool themselves (presumably updating the inputs and subtracting point sources), or 4) use their own tools and methodology to provide estimates. In addition, some S/L/Ts submit emissions data for the point data category. Figure 13-1 shows these state-level data sources for the oil and gas sector. Figure 13-1: Data source for Oil and Gas emissions asto'sife .Allegheny^ [Douglay Kountw Wefferson] ¦CsQuntfl yy//% o up tyo u n ty ' ¦Email County] Oil and Gas Data Source Map 2020 NEI Data Source EPA Tool IH EPA Tool with revised inputs mm EPA Tool with revised inputs and SLT Nonpoint EPA Tool and SLT Nonpoint | SLT Nonpoint Y//A SLT Point Esn, FAO, NOAA. USGS Table 13-2 summarizes the data that was submitted by states in the oil and gas production sector for both point and nonpoint. 13-5 ------- Table 13-2: Data Source for Oil and Gas Production Data in the 2020 NEI State Nonpoint Point AL EPA estimates only Submitted to Point Inventory AK EPA estimates and SLT Submitted to Point Inventory Allegheny Submitted to Point Inventory AZ EPA estimates only Submitted to Point Inventory AR EPA estimates only Submitted to Point Inventory CA SLT only Submitted to Point Inventory CO EPA estimates and SLT Submitted to Point Inventory CT Submitted to Point Inventory DE Submitted to Point Inventory FL EPA estimates only Submitted to Point Inventory GA Submitted to Point Inventory ID EPA estimates only IL EPA estimates only Subm tted to Point Inventory IA Subm tted to Point Inventory IN EPA estimates only Subm tted to Point Inventory Jefferson City Subm tted to Point Inventory KS EPA Tool with revised inputs Subm tted to Point Inventory KY EPA estimates only Subm tted to Point Inventory Louisville EPA estimates only Subm tted to Point Inventory LA EPA estimates only Subm tted to Point Inventory MA Subm tted to Point Inventory MD EPA estimates only Subm tted to Point Inventory ME Subm tted to Point Inventory Memphis Subm tted to Point Inventory Ml EPA estimates only Subm tted to Point Inventory MN Subm tted to Point Inventory MS EPA estimates only Subm tted to Point Inventory MO EPA estimates only Subm tted to Point Inventory MT EPA estimates only Subm tted to Point Inventory Nashville Subm tted to Point Inventory NE EPA estimates only Subm tted to Point Inventory NJ SLT only Subm tted to Point Inventory NV EPA estimates only Subm tted to Point Inventory NM EPA Tool with revised inputs Subm tted to Point Inventory NY EPA estimates only Subm tted to Point Inventory ND EPA estimates only Subm tted to Point Inventory OH EPA estimates and SLT Subm tted to Point Inventory OK EPA Tool with revised inputs and SLT Subm tted to Point Inventory OR EPA estimates only Subm tted to Point Inventory Omaha Subm tted to Point Inventory PA EPA Tool with revised inputs Subm tted to Point Inventory 13-6 ------- Pinal Submitted to Point Inventory SC Submitted to Point Inventory SD EPA estimates only TN EPA estimates only Submitted to Point Inventory TX EPA Tool with revised inputs and SLT Submitted to Point Inventory UT EPA Tool and SLT Submitted to Point Inventory VA EPA estimates only Submitted to Point Inventory WV EPA Tool with revised inputs and SLT Submitted to Point Inventory Wl Submitted to Point Inventory WY SLT only Submitted to Point Inventory Shoshone Bannock Submitted to Point Inventory Southern Ute SLT only Submitted to Point Inventory 13.3 EPA-developed estimates The EPA furthered the development of the existing oil and gas emissions estimation tool that was originally developed for the 2011 NEl, which is a MS Access database that uses a bottom-up approach to build a national inventory. More information on the tool can be found in the documentation provided by ERG, entitled "2020 Nonpoint Oil and Gas Emission Estimation Tool, version 1.3" in the file "2020 Oil and Gas Emissions Estimation Tool VI 3.pdf". There are two modules, as was put in place since the 2014 tool: Exploration and Production. Changes that have been incorporated in the 2020 Oil and Gas Production and Exploration tools since 2017 are addressed in the documentation above. In addition, a memo outlining the additional data from the GHG Reporting Program (subpart W) is entitled 2020 NEI Oil and Gas Tool Subpart W Analysis. In general, the tool calculates emissions for each piece of equipment on a well pad (like condensate tanks or dehydrators, for example) in a county or basin, based on average equipment counts taken from either surveys, literature searches, or the GHG reporting program, also accounting for control devices and gas composition in each county. County-level details are important, since well pads can vary significantly from region to region, basin to basin, and county to county. A well site in Denver, CO in the Denver-Julesburg Basin might look very different from one in the Marcellus Shale in PA, due to changes in technology over time (when the well was first drilled), geologic formations of the oil and gas reservoirs themselves (which also change over timethe ratio of oil to gas changes as pressure in the reservoir is released), and regulations in place guiding the equipment used on site. The math used in the oil and gas tool is more complex than most other categories, as it uses equations like the ideal gas law and mass balances, in conjunction with more traditional emission rate equations (activity * EF = emissions); thus, the work is best completed in database format. Overall, there are hundreds of inputs to the oil and gas tool, and these are broken down into three basic categories: activity data, basin factors, and emission factors. These inputs to the tool are filled in by EPA, and published with the tool, along with their references. Region specific inputs are preferable and are used when available. Extrapolated inputs from nearby counties in the same basin are then used to fill in gaps in data. National defaults are filled in where no other data is available, and attempts are made to align inputs as much as possible with the GHG reporting program and emissions inventory. 13-7 ------- 13.3.1 Activity data The primary source of activity data for the 2020 Tool is the commercially available database developed by Enverus called HPDI, or also called the Dl Desktop database. HPDI supplies activity such as number of wells, oil, gas, condensate, and water production, feet drilled, spud counts, and other data. There are cases where this data is not complete, and in those cases, EPA supplemented with data from RIGDATA, from various state oil and gas commissions, and directly from Tool users. More details on these data can be found in the aforementioned report. The following SLTs provided updated activity inputs for the 2020 Tool: Kansas (Production) Oklahoma (Production) Pennsylvania (Production) Texas (Production) Illinois (Production) West Virginia (Production/Exploration). 13.3.2 FIPS changes and Temperature changes State/County FIPS codes were updated for several counties in Alaska and annual county-level average temperatures for 2020 were updated nationally, using EPA's 2020 Weather Research Factorization (WRF) model data. 13.3.3 Basin factors Basin factors include factors that are secondary to activity and include assumptions about equipment counts on a per well basis, (e.g., the number of pneumatic controllers per well, or the average HP of an engine at a well site) as well as gas speciation profiles (fraction of benzene, toluene, xylene, or ethylbenzene in natural gas at a particular point in the well pad, e.g., post separator). For 2020 inputs, GHGRP data gathered under subpart W was analyzed to develop updated basin factors for several source categories including storage tanks, dehydrators, fugitive equipment leaks, heaters, pneumatic devices, and wellhead compressor engines. See "2020 NEl Tool Subpart W Data Analysis" memo dated December 3, 2021. Western Regional Air Partnership (WRAP) data was used to develop updated basin factors for several source categories for Montana, New Mexico, North Dakota, and South Dakota. Details of the emissions factor, speciation factor and other changes for some WRAP basins are contained in memos and documents provided here: https://gaftp.epa.gov/Air/nei/2020/doc/supporting data/nonpoint/oilgas/WRAP survey/. Data provided by the California Air Resources Board (CARB) was used to develop updated basin factors for several source categories for oil-related sources. US Energy Information Administration (EIA) data was used to update the volumes of gas vented/flared in the associated gas venting and flaring category, and this data can be found at the following link: (https://www.eia.gov/dnav/ng/ng prod sum a ERGO VGV mmcf a.htm). 13-8 ------- 13.3.4 Emission factors Emission factors are also a part of the formula for estimating emissions, and in the Oil and Gas tool the nomenclature is set such that we only call the standard national factors, like from AP-42 combustion equations, "emission factors." For the 2020 Tool, the following emissions factor updates occurred: 1. Drilling and hydraulic fracturing engine emission factors were updated using the MOVES model for 2020. 2. The flaring CO emission factor was updated based on updates to the AP-42. 3. A S02 emission factor from AP-42 was added for heater treaters. 13.3.5 Methodology Updates The methodology used to estimate VOC emissions from associated gas venting and flaring was revised to include only process-based emissions (accounting for VOC sent to the flare). The tool no longer uses the AP-42 flaring VOC emission factor in the calculation. 13.3.6 Point source subtraction Some states count upstream oil and gas production processes as point sources, and therefore have a need to subtract these from the nonpoint part of the inventory. The tool allows for point source subtraction on either an activity or emissions basis, and a few states have taken advantage of this feature. The state of New Mexico added a considerable number of sources to their oil and gas point source inventory in the NEI. New Mexico provided a county-SCC summary of emissions for use in the Tool as part of the point source subtraction functionality. Updated nonpoint emissions were generated for New Mexico after this point source subtraction and were used in the 2020NEI. 13.3.7 Other State-specific correspondence Oklahoma The Oklahoma Department of Environmental Quality (OK DEQ) uses a mix of both EPA estimates (for the exploration module) and their own emissions using the oil and gas tool (production module only). OK DEQ allows EPA to do HAP augmentation for the SCCs that they submit. One difference between OK DEQ's SCC emissions dataset and EPA's SCCs are that OK DEQ aggregates their equipment-specific fugitive emissions into Fugitive All Process SCCs for oil, gas and CBM wells. Pennsylvania The PADEP relies on EPA to run the oil and gas tool but utilizes alternative SCCs for several source categories in order to differentiate their emissions for conventional and unconventional oil and gas operations. PA DEP provides unconventional well API numbers which EPA then subtracts from the tool to determine the conventional portion. The process includes the following steps: 1. Run the tool with basin factors that the Mid-Atlantic Regional Air Management Association (MARAMA) provided for the 2014 NEI oil and gas sector for Artificial lifts 13-9 ------- Associated gas Condensate tanks Crude tanks Dehydrators Fugitives Gas-actuated pumps (oil and gas wells) For associated gas, condensate tanks, crude oil tanks, and dehydrators, if the Tool sources were the 2020 GHGRP factors recently documented, these were not replaced. EPA also incorporated gas composition profiles provided by the PA DEP. 2. Remove the activity data related to the emissions data provided by PA using API numbers for unconventional wells. 3. Run the tool for adjusted emissions. 4. Use the "conventional only" SCCs to replace the more "general" Tool SCCs for 5 source categories: Drilling Gas Well Condensate Tanks Gas Well Heaters Gas Well Dehydrators Gas Well Liquids Unloading Details regarding the Pennsylvania emissions can be found here: https://gaftp.epa.gov/Air/nei/2020/doc/supporting data/nonpoint/oilgas/OIL GAS TOOL vl.B/PA 202 ISSIONS 20220801.xlsx 13-10 ------- United States Office of Air Quality Planning and Standards Publication No. EPA-454/R-23-001m Environmental Protection Air Quality Assessment Division March 2023 Agency Research Triangle Park, NC ------- |