MEMORANDUM

To: Docket # EPA-HQ-OAR-2011-0512

From: Mark de Figueiredo, EPA/CCD

Date: November 10, 2014

Subject: Final Data Category Assignments and Confidentiality Determinations for 

Data Elements (excluding inputs to emission equations) in the “Greenhouse Gas 

Reporting Rule: 2014 Revisions and Confidentiality Determinations for Petroleum 

and Natural Gas Systems; Final Rule”

In the rulemaking titled “Greenhouse Gas Reporting Rule: 2014 Revisions and 

Confidentiality Determinations for Petroleum and Natural Gas Systems; Final Rule” (hereinafter 

referred to as the Subpart W 2014 Amendments), the EPA is amending the current 40 CFR part 

98, subpart W rule.1 These revisions include changes to existing reporting requirements and the 

addition of several new data elements. As part of that final action, the EPA is finalizing 

confidentiality determinations for the new and substantially revised data elements (i.e., those 

requiring additional or different data to be reported). In this memorandum, we provide a list of 

all the new and substantially revised data elements (excluding those assigned to the inputs to 

emission equations data category), their finalized confidentiality determinations (as applicable), 

and where appropriate, the data category assignments. For discussion of the changes made after 

proposal, see Section III of the preamble to the Subpart W 2014 Amendments.

Table 1 shows the final category assignments for all new and substantially revised data 

elements assigned to data categories for which a categorical confidentiality determination was 

previously finalized in 2011.

2 The categorical confidentiality determinations established in 2011

apply to the data elements listed in this table. 

Table 2 shows the finalized categorical assignments and confidentiality determinations 

for all new and substantially revised data elements assigned to the data categories “Unit/Process 

‘Operating’ Characteristics That Are Not Inputs to Emission Equations” and “Unit/Process 

‘Static’ Characteristics that Are Not Inputs to Emission Equations.” For the data elements listed 

in this table, the EPA is finalizing confidentiality determinations based on a case-by-case review 

for each listed data element. Table 3 shows the final confidentiality determinations for 5 new 

data elements for which no categorical assignment was made and one existing data element for 

which the previous categorical assignment and confidentiality determination was changed by this 

final rule.

1 See Docket Id. No. EPA-HQ-OAR-2011-0512. 2 See “Proposed Confidentiality Determinations for Data Required Under the Mandatory Greenhouse Gas Reporting 

Rule and Proposed Amendment to Special Rules Governing Certain Information Obtained Under the Clean Air Act” 

published on July 7, 2010 (75 FR 39094); and “Confidentiality Determinations for Data Required under the 

Mandatory Greenhouse Gas Reporting Rule and Amendment to Special Rules Governing Certain Information 

Obtained under the Clean Air Act” published on May 26, 2011 (76 FR 30782).

1

 
As explained in Section III of preamble to the Subpart W 2014 Amendments, the EPA 

decided not to make confidentiality determinations for 5 data elements. Table 4 lists the data 

elements for which no confidentiality determination has been made. These data elements will not 

be disclosed to the public until the EPA has made a case-by-case determination in accordance 

with the procedures in 40 CFR part 2, subpart B. 

The Subpart W 2014 Amendments include new and revised subpart W reporting 

requirements assigned to the “Inputs to Emission Equations” data category. For a list of the 

inputs to emission equations, see the memorandum titled “Review for Potential Disclosure 

Concerns for New and Revised Inputs to Emission Equations in the ‘Greenhouse Gas Reporting 

Rule: 2014 Revisions and Confidentiality Determinations for Petroleum and Natural Gas 

Systems; Final Rule’” (Inputs memorandum). We determined that seven data elements are inputs 

only in certain situations. The data elements in §98.236(g)(5)(i), (h)(1)(iv), (h)(2)(iv), (m)(5), 

and (m)(6) are inputs when the applicable data are available for only one well. The data element 

in §98.236(i)(1)(i) is an input when only one unique physical volume is blown down for a 

particular equipment type. The data element in §98.236(j)(3)(ii) is an input when only one 

separator has a dump valve that did not close properly during the year. For situations when these 

seven data elements are not inputs, the confidentiality determinations noted in this memorandum 

apply.

Table 5 lists proposed data elements that were removed from Tables 1 through 3 since 

proposal and the reasons for removal. Typically, data elements were removed because they have 

been determined to be inputs and moved to the Inputs memorandum. Other data elements were 

removed because we decided not to finalize a confidentiality determination, the data element was

consolidated with another data element since proposal based on consideration of public 

comments, the data element is actually a current data element, or we inadvertently listed the data 

element in more than one table at proposal.

Table 6 lists data elements that were added to Tables 1 and 2 since proposal and the 

rationale for their data category assignments and confidentiality determinations. Most of the new

data elements were added to Table 2. Some were added to harmonize with changes in emission 

calculation methods that were made after consideration of public comments on the proposed 

amendments. Others were inadvertently overlooked in the analysis for the proposed rule. One 

was proposed as an input only, but it has since been determined to be an input only when the 

reported data are for a single well.

Copies of the proposed and final Subpart W 2014 Amendment notices can be found on 

EPA’s website at http://www.epa.gov/ghgreporting/reporters/rules/index.html. For the EPA’s 

responses to comments on the proposed confidentiality determinations, see the document titled 

Response to Public Comments on Greenhouse Gas Reporting Rule: 2014 Revisions and 

Confidentiality Determinations for Petroleum and Natural Gas Systems, available from the 

Docket ID No. EPA-HQ-OAR-2011-0512. Copies of the proposed and final CBI rules identified 

in this memorandum are available on EPA’s website: 

http://www.epa.gov/ghgreporting/reporters/cbi/index.html, at the following links: 

http://www.gpo.gov/fdsys/pkg/FR-2010-07-07/pdf/2010-16317.pdf and 

http://www.gpo.gov/fdsys/pkg/FR-2011-05-26/pdf/2011-12930.pdf.

2
Table 1. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to Categories with Categorical Determinations3

Rule Citation Final Data Element

Final Category 

Assignment

Categorical 

Determination (as 

Established in 2011)

Natural Gas Pneumatic Device Venting

§98.236(b) Whether the facility has any continuous high-bleed, intermittent bleed, or 

continuous low-bleed natural gas pneumatic devices subject to reporting.

Facility and Unit Identifier 

Information

Emission Data

§98.236(b)(1)(ii)(C) Whether the reporting year is first or second year of reporting. Calculation Methodology 

and Methodological Tier

Emission Data

Natural Gas Pneumatic Pump Venting

§98.236(c) Whether the facility has any natural gas driven pneumatic pumps. Facility and Unit Identifier 

Information

Emission Data

Acid Gas Removal

§98.236(d) Whether the facility has any acid gas removal units vented directly to the 

atmosphere, to a flare or engine, or to a sulfur recovery plant.

Facility and Unit Identifier 

Information

Emission Data

§98.236(d)(1)(vi) Sub-basin ID that best represents the wells supplying gas to the unit (for 

the onshore petroleum and natural gas production segment only).

Facility and Unit Identifier 

Information

Emission Data

§98.236(d)(2)(ii)(A) If you used Calculation Method 3 as specified in §98.233(d), whether 

Equation W-4A or W-4B was used.

Calculation Methodology 

and Methodological Tier

Emission Data

§98.236(d)(2)(iii)(A) If you used Calculation Method 4 as specified in §98.233(d), the name of 

the simulation software package used.

Calculation Methodology 

and Methodological Tier

Emission Data

Dehydrators

§98.236(e) Whether the facility has any: glycol dehydrators with an annual average 

daily natural gas throughput ≥ 0.4 MMscfd, glycol dehydrators that have 

an annual average daily natural gas throughput < 0.4 MMscfd, and 

desiccant dehydrators.

Facility and Unit Identifier 

Information

Emission Data

§98.236(e)(1)(xviii) For each glycol dehydrator with an annual average daily throughput ≥ 

0.4 MMscfd, the sub-basin ID that best represents the wells supplying 

gas to the dehydrator (for the onshore petroleum and natural gas 

production industry segment only).

Facility and Unit Identifier 

Information

Emission Data

3 The categorical confidentiality determinations for the data categories listed in this table were finalized on May 26, 2011 (see 76 FR 30782). 

3

 
Table 1. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to Categories with Categorical Determinations (continued)

Rule Citation Final Data Element

Final Category 

Assignment

Categorical 

Determination (as 

Established in 2011)

Liquids Unloading

§98.236(f) Indicate which calculation methods (as specified in §98.233(f)) were 

used.

Calculation Methodology 

and Methodological Tier

Emission Data

§98.236(f)(1)(i) For each sub-basin and well tubing diameter and pressure group for 

which you used Calculation Method 1 (reported separately for wells with 

plunger lifts and wells without plunger lifts), the Sub-basin ID.

Facility and Unit Identifier 

Information

Emission Data

§98.236(f)(1)(ii) For each sub-basin and well tubing diameter and pressure group for 

which you used Calculation Method 1 (reported separately for wells with 

plunger lifts and wells without plunger lifts), a well tubing diameter and 

pressure group ID.

Facility and Unit Identifier 

Information

Emission Data

§98.236(f)(1)(v) For each sub-basin and well tubing diameter and pressure group for 

which you used Calculation Method 1 (reported separately for wells with 

plunger lifts and wells without plunger lifts), the percentage of wells for 

which the monitoring period used to determine the cumulative venting 

time was not the full calendar year.

Calculation Methodology 

and Methodological Tier

Emission Data

§98.236(f)(1)(viii) For each sub-basin and well tubing diameter and pressure group for 

which you used Calculation Method 1 (reported separately for wells with 

plunger lifts and wells without plunger lifts), annual natural gas 

emissions (scf/yr).

Emissions Emission Data

§98.236(f)(1)(xi)(A) For each sub-basin and well tubing diameter and pressure group for 

which you used Calculation Method 1 (for wells without plunger lifts), 

the API Well number of tested well.

Facility and Unit Identifier 

Information

Emission Data

§98.236(f)(1)(xii)(A) For each sub-basin and well tubing diameter and pressure group for 

which you used Calculation Method 1 (for wells with plunger lifts), the 

API Well number of tested well.

Facility and Unit Identifier 

Information

Emission Data

§98.236(f)(2)(i) For each sub-basin for which you used Calculation Method 2 or 3, the 

Sub-basin ID.

Facility and Unit Identifier 

Information

Emission Data

§98.236(f)(2)(ii) For each sub-basin for which you used Calculation Method 2 or 3, the 

calculation method.

Calculation Methodology 

and Methodological Tier

Emission Data

4
Table 1. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to Categories with Categorical Determinations (continued)

Rule Citation Final Data Element

Final Category 

Assignment

Categorical 

Determination (as 

Established in 2011)

§98.236(f)(2)(vi) For each sub-basin for which you used Calculation Method 2 or 3, total 

annual natural gas emissions (scf/yr) from well venting for liquids 

unloading, as calculated according to §98.233(f)(2) or §98.233(f)(3), as 

applicable.

Emissions Emission Data

Gas Well Completions and Workovers with Hydraulic Fracturing

§98.236(g)(1) For each sub-basin and well type combination with completions or 

workovers with hydraulic fracturing, the sub-basin ID.

Facility and Unit Identifier 

Information

Emission Data

§98.236(g)(2) For each sub-basin, the well type combination(s) for completions with 

hydraulic fracturing and the well type combination(s) for workovers with 

hydraulic fracturing.

Facility and Unit Identifier 

Information

Emission Data

§98.236(g)(4) For each sub-basin and well type combination, the calculation method

used for completions with hydraulic fracturing and the calculation 

method used for workovers with hydraulic fracturing.

Calculation Methodology 

and Methodological Tier

Emission Data

§98.236(g)(7) For each sub-basin and well type combination with completions or 

workovers with hydraulic fracturing, annual gas emissions, in standard 

cubic feet (“Es,n” in Equation W-10A or W-10B).

Emissions Emission Data

Gas Well Completions and Workovers without Hydraulic Fracturing

§98.236(h)(1)(i) For each sub-basin with gas well completions without hydraulic 

fracturing and without flaring, the Sub-basin ID.

Facility and Unit Identifier 

Information

Emission Data

§98.236(h)(2)(i) For each sub-basin with gas well completions without hydraulic 

fracturing and with flaring, the Sub-basin ID.

Facility and Unit Identifier 

Information

Emission Data

§98.236(h)(3)(i) For each sub-basin with gas well workovers without hydraulic fracturing 

and without flaring, the Sub-basin ID.

Facility and Unit Identifier 

Information

Emission Data

§98.236(h)(4)(i) For each sub-basin with gas well workovers without hydraulic fracturing 

and with flaring, the Sub-basin ID.

Facility and Unit Identifier 

Information

Emission Data

Blowdown Vent Stacks

§98.236(i) You must indicate whether your facility has blowdown vent stacks. Facility and Unit Identifier 

Information

Emission Data

5
Table 1. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to Categories with Categorical Determinations (continued)

Rule Citation Final Data Element

Final Category 

Assignment

Categorical 

Determination (as 

Established in 2011)

§98.236(i) You must indicate whether emissions are calculated by equipment or 

event type or with flow meters or both.

Calculation Methodology 

and Methodological Tier

Emission Data

§98.236(i)(1) If reporting by the seven categories listed in §98.233(i)(2), the applicable 

equipment or event types.

Facility and Unit Identifier 

Information

Emission Data

§98.236(i)(1)(ii) If reporting by equipment or event type, annual CO2 emissions for each 

equipment or event type (mt CO2/yr).

Emissions Emission Data

§98.236(i)(1)(iii) If reporting by equipment or event type, annual CH4 emissions for each 

equipment or event type (mt CH4/yr).

Emissions Emission Data

§98.236(i)(2)(i) If emissions are determined using a flow meter, annual CO2 emissions 

(mt CO2/yr).

Emissions Emission Data

§98.236(i)(2)(ii) If emissions are determined using a flow meter, annual CH4 emissions 

(mt CH4/yr).

Emissions Emission Data

Onshore Production Storage Tanks

§98.236(j) Indicate whether the facility sends produced oil to atmospheric tanks. Facility and Unit Identifier 

Information

Emission Data

§98.236(j)(1)(i) For each sub-basin where Calculation Method 1 or 2 is used, the Subbasin ID.Facility and Unit Identifier 

Information

Emission Data

§98.236(j)(1)(ii) Calculation method used, and name of the software package used if 

using Calculation Method 1.

Calculation Methodology 

and Methodological Tier

Emission Data

§98.236(j)(2)(ii)(A) For each sub-basin with atmospheric tanks using Calculation Method 3 

that did not control emissions with flares, the Sub-basin ID.

Facility and Unit Identifier 

Information

Emission Data

§98.236(j)(2)(iii)(A) For each sub-basin with atmospheric tanks using Calculation Method 3 

that controled emissions with flares, the Sub-basin ID.

Facility and Unit Identifier 

Information

Emission Data

Transmission Storage Tanks

§98.236(k) Whether your facility contains any transmission storage tanks. Facility and Unit Identifier 

Information

Emission Data

§98.236(k)(1)(ii) For each transmission storage tank vent stack, the method used to 

determine if dump valve leakage is occurring.

Test and Calibration 

Methods

Not CBI

6
Table 1. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to Categories with Categorical Determinations (continued)

Rule Citation Final Data Element

Final Category 

Assignment

Categorical 

Determination (as 

Established in 2011)

§98.236(k)(2)(i) For each transmission storage tank vent stack where leakage is occurring 

and the vent stack is vented directly to the atmosphere, the method used 

to measure the leakage rate.

Test and Calibration 

Methods

Not CBI

§98.236(k)(2)(ii) If emissions from scrubber dump valve leakage were vented direct to 

atmosphere, measured leak rate (average leak rate for a continuous flow 

measurement device) in standard cubic feet per hour.

Emissions Emission Data

§98.236(k)(3)(ii) If emissions from scrubber dump valve leakage were controlled using a 

flare, measured leak rate (average leak rate for a continuous flow 

measurement device) in standard cubic feet per hour.

Emissions Emission Data

§98.236(k)(3)(i) For each transmission storage tank vent stack where leakage is occurring 

and the vent stack vents to a flare, the method used to measure the 

leakage rate.

Test and Calibration 

Methods

Not CBI

Well Testing

§98.236(l) Whether you performed gas well or oil well testing that resulted in 

vented or flared emissions during the reporting year.

Facility and Unit Identifier 

Information

Emission Data

Associated Natural Gas

§98.236(m)(1) For each Sub-basin in which associated gas was vented or flared, the 

Sub-basin ID.

Facility and Unit Identifier 

Information

Emission Data

Flare Stacks

§98.236(n) You must indicate if your facility contains any flare stacks. Facility and Unit Identifier 

Information

Emission Data

Centrifugal Compressors

§98.236(o) You must indicate whether your facility has centrifugal compressors. Facility and Unit Identifier 

Information

Emission Data

§98.236(o)(1)(i) For each centrifugal compressor at your facility, a unique name or ID for 

the compressor.

Facility and Unit Identifier 

Information

Emission Data

§98.236(o)(1)(iv) Indicate whether the compressor was measured in operating-mode. Test and Calibration 

Methods

Not CBI

7
Table 1. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to Categories with Categorical Determinations (continued)

Rule Citation Final Data Element

Final Category 

Assignment

Categorical 

Determination (as 

Established in 2011)

§98.236(o)(1)(v) Indicate whether the compressor was measured in not-operatingdepressurized-mode.Test and Calibration 

Methods

Not CBI

§98.236(o)(2)(i)(A) For each compressor source at each centrifugal compressor, the 

compressor name or ID.

Facility and Unit Identifier 

Information

Emission Data

§98.236(o)(2)(i)(B) For each compressor source at each centrifugal compressor, the 

compressor source (wet seal, isolation valve, or blowdown valve).

Facility and Unit Identifier 

Information

Emission Data

§98.236(o)(2)(i)(C) For each compressor source at each centrifugal compressor, the unique 

name or ID for the leak or vent. If the leak or vent is connected to a 

manifolded group of compressor sources, use the same leak or vent ID 

for each compressor source in the manifolded group. If multiple 

compressor sources are released through a single vent for which 

continuous measurements are used, use the same leak or vent ID for each 

compressor source released via the measured vent. For a single 

compressor using as found measurements, you must provide a different 

leak or vent ID for each compressor source.

Facility and Unit Identifier

Information

Emission Data

§98.236(o)(2)(ii)(A) For each leak or vent, indicate whether the leak or vent is for a single 

compressor source or manifolded group of compressor sources and 

whether the emissions from the leak or vent are released to the 

atmosphere, routed to a flare, combustion (fuel or thermal oxidizer), or 

vapor recovery.

Calculation Methodology 

and Methodological Tier

Emission Data

§98.236(o)(2)(ii)(B) For each leak or vent, indicate whether an as found measurement(s) as 

identified in §98.233(o)(2) or (o)(4) was conducted on the leak or vent.

Test and Calibration 

Methods

Not CBI

§98.236(o)(2)(ii)(C) For each leak or vent, indicate whether continuous measurements as 

identified in §98.233(o)(3) or (o)(5) were conducted on the leak or vent.

Test and Calibration 

Methods

Not CBI

§98.236(o)(3)(i)(A) If the measurement methods specified in paragraphs §98.233(o)(2) or 

(o)(4) are conducted, then for each as found measurement performed on 

a leak or vent, report the name or ID of the leak or vent.

Facility and Unit Identifier 

Information

Emission Data

§98.236(o)(3)(i)(B) If the measurement methods specified in paragraphs §98.233(o)(2) or 

(o)(4) are conducted, then for each as found measurement performed on 

a leak or vent, report the measurement date.

Test and Calibration 

Methods

Not CBI

8
Table 1. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to Categories with Categorical Determinations (continued)

Rule Citation Final Data Element

Final Category 

Assignment

Categorical 

Determination (as 

Established in 2011)

§98.236(o)(3)(i)(C) If the measurement methods specified in paragraphs §98.233(o)(2) or 

(o)(4) are conducted, then for each as found measurement performed on 

a leak or vent, report the measurement method.

Test and Calibration 

Methods

Not CBI

§98.236(o)(3)(i)(E) If the measurement methods specified in paragraphs §98.233(o)(2) or 

(o)(4) are conducted, then for each as found measurement performed on 

a leak or vent, and for each compressor attached to the leak or vent, 

report the compressor mode during which the measurement was taken.

Test and Calibration 

Methods

Not CBI

§98.236(o)(3)(ii)(A) For each compressor mode-source combination where a reporter 

emission factor as calculated in Equation W-23 was used to calculate 

emissions in Equation W-22, report the compressor mode-source 

combination.

Facility and Unit Identifier 

Information

Emission Data

§98.236(o)(3)(ii)(D) Indicate whether the compressor mode-source combination reporter 

emission factor is facility-specific or based on all of the reporter’s 

applicable facilities.

Calculation Methodology 

and Methodological Tier

Emission Data

§98.236(o)(4)(i) Continuous measurement data. If the measurement methods specified in 

paragraphs §98.233(o)(3) or (o)(5) are conducted, report the name or ID 

of the leak or vent.

Facility and Unit Identifier 

Information

Emission Data

Reciprocating Compressors

§98.236(p) You must indicate whether your facility has reciprocating compressors. Facility and Unit Identifier 

Information

Emission Data

§98.236(p)(1)(i) For each reciprocating compressor at your facility, unique name or ID

for the compressor.

Facility and Unit Identifier 

Information

Emission Data

§98.236(p)(1)(v) Indicate whether the compressor was measured in operating-mode. Test and Calibration 

Methods

Not CBI

§98.236(p)(1)(vi) Indicate whether the compressor was measured in standby-pressurizedmode.Test and Calibration 

Methods

Not CBI

§98.236(p)(1)(vii) Indicate whether the compressor was measured in not-operatingdepressurized-mode.Test and Calibration 

Methods

Not CBI

9
Table 1. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to Categories with Categorical Determinations (continued)

Rule Citation Final Data Element

Final Category 

Assignment

Categorical 

Determination (as 

Established in 2011)

§98.236(p)(2)(i)(A) For each compressor source at each reciprocating compressor, the

compressor name or ID.

Facility and Unit Identifier 

Information

Emission Data

§98.236(p)(2)(i)(B) For each compressor source at each reciprocating compressor, the

compressor source (isolation valve, blowdown valve, or rod packing).

Facility and Unit Identifier 

Information

Emission Data

§98.236(p)(2)(i)(C) For each compressor source at each reciprocating compressor, the unique 

name or ID for the leak or vent. If the leak or vent is connected to a 

manifolded group of compressor sources, use the same leak or vent ID 

for each compressor source in the manifolded group. If multiple 

compressor sources are released through a single vent for which 

continuous measurements are used, use the same leak or vent ID for each 

compressor source released via the measured vent. For a single 

compressor using as found measurements, you must provide a different 

leak or vent ID for each compressor source.

Facility and Unit Identifier 

Information

Emission Data

§98.236(p)(2)(ii)(A) For each leak or vent, indicate whether the leak or vent is for a single 

compressor source or manifolded group of compressor sources and 

whether the emissions from the leak or vent are released to the

atmosphere, routed to a flare, combustion (fuel or thermal oxidizer), or 

vapor recovery.

Calculation Methodology 

and Methodological Tier

Emission Data

§98.236(p)(2)(ii)(B) For each leak or vent, indicate whether an as found measurement(s) as 

identified in §98.233(p)(2) or (p)(4) was conducted on the leak or vent.

Test and Calibration 

Methods

Not CBI

98.236(p)(2)(ii)(C) For each leak or vent, indicate whether continuous measurements as 

identified in §98.233(p)(3) or (p)(5) were conducted on the leak or vent.

Test and Calibration 

Methods

Not CBI

§98.236(p)(3)(i)(A) If the measurement methods specified in paragraphs §98.233(p)(2) or 

(p)(4) are conducted, then for each as found measurement performed on 

a leak or vent, report the name or ID of the leak or vent.

Facility and Unit Identifier 

Information

Emission Data

§98.236(p)(3)(i)(B) If the measurement methods specified in paragraphs §98.233(p)(2) or 

(p)(4) are conducted, then for each as found measurement performed on 

a leak or vent, report the measurement date.

Test and Calibration 

Methods

Not CBI

10
Table 1. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to Categories with Categorical Determinations (continued)

Rule Citation Final Data Element

Final Category 

Assignment

Categorical 

Determination (as 

Established in 2011)

§98.236(p)(3)(i)(C) If the measurement methods specified in paragraphs §98.233(p)(2) or 

(p)(4) are conducted, then for each as found measurement performed on 

a leak or vent, report the measurement method.

Test and Calibration 

Methods

Not CBI

§98.236(p)(3)(i)(E) If the measurement methods specified in paragraphs §98.233(p)(2) or 

(p)(4) are conducted, then for each as found measurement performed on 

a leak or vent, and for each compressor attached to the leak or vent, 

report the compressor mode during which the measurement was taken. 

Test and Calibration 

Methods

Not CBI

§98.236(p)(3)(ii)(A) For each compressor mode-source combination where a reporter 

emission factor as calculated in Equation W-28 was used to calculate 

emissions in Equation W-27, report the compressor mode-source 

combination.

Facility and Unit Identifier 

Information

Emission Data

§98.236(p)(3)(ii)(D) Indicate whether the compressor mode-source combination reporter 

emission factor is facility-specific or based on all of the reporter’s 

applicable facilities. 

Calculation Methodology 

and Methodological Tier

Emission Data

§98.236(p)(4)(i) Continuous measurement data. If the measurement methods specified in 

paragraphs §98.233(p)(3) or (p)(5) are conducted, report the name or ID 

of leak or vent.

Facility and Unit Identifier 

Information

Emission Data

Equipment Leaks Surveys

§98.236(q)(1)(i) You must report the number of complete leak surveys performed during 

the calendar year.

Test and Calibration 

Methods

Not CBI

§98.236(q)(1)(ii) For natural gas distribution facilities performing a multiple year leak 

survey cycle, the number of years in the leak survey cycle.

Test and Calibration 

Methods

Not CBI

§98.236(q)(2)(i) For all facilities that perform equipment leak surveys, each component 

type.

Facility and Unit Identifier 

Information

Emission Data

Equipment Leaks by Population Count

§98.236(r)(1) You must indicate whether your facility contains any of the emission 

source types required to use Equation W-32A, for the applicable industry 

segment.

Facility and Unit Identifier 

Information

Emission Data

11
Table 1. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to Categories with Categorical Determinations (continued)

Rule Citation Final Data Element

Final Category 

Assignment

Categorical 

Determination (as 

Established in 2011)

§98.236(r)(1)(i) Emission source type. Facility and Unit Identifier 

Information

Emission Data

§98.236(r)(2)(v)(A) For facilities with above grade transmission-distribution transfer stations 

and above grade metering-regulating stations that are not above grade 

transmission-distribution transfer stations, annual CO2 emissions from 

the above grade metering-regulating stations that are not above grade 

transmission-distribution transfer stations.

Emissions Emission Data

§98.236(r)(2)(v)(B) For facilities with above grade transmission-distribution transfer stations 

and above grade metering-regulating stations that are not above grade 

transmission-distribution transfer stations, annual CH4 emissions from 

the above grade metering-regulating stations that are not above grade 

transmission-distribution transfer stations.

Emissions Emission Data

§98.236(r)(3)(i) For onshore petroleum and natural gas production facilities, the 

calculation method used.

Calculation Methodology 

and Methodological Tier

Emission Data

§98.236(r)(3)(ii)(A) For onshore petroleum and natural gas production facilities, indication of 

whether the facility contains the major equipment type.

Facility and Unit Identifier 

Information

Emission Data

EOR Injection Pumps

§98.236(w)(1) For each EOR injection pump system with blowdown, the Sub-basin ID. Facility and Unit Identifier 

Information

Emission Data

§98.236(w)(2) For each EOR injection pump system with blowdown, an identifier. Facility and Unit Identifier 

Information

Emission Data

EOR Hydrocarbon Liquids

§98.236(x)(1) For each sub-basin with EOR operations from which hydrocarbon 

liquids were produced, the Sub-basin ID.

Facility and Unit Identifier 

Information

Emission Data

Combustion Equipment for Onshore Petroleum and Natural Gas Production and Natural Gas Distribution Facilities

§98.236(z) Indicate whether your facility has any combustion units subject to 

reporting.

Facility and Unit Identifier 

Information

Emission Data

12
Table 1. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to Categories with Categorical Determinations (continued)

Rule Citation Final Data Element

Final Category 

Assignment

Categorical 

Determination (as 

Established in 2011)

§98.236(z)(1) Indicate whether the combustion units subject to reporting under §98.232 

include external fuel combustion units with a rated heat less than or 

equal to 5 MMBtu/hr, or internal fuel combustion units, excluding 

compressor-drivers, with a rated heat capacity less than or equal to 1 

MMBtu/hr (or the equivalent of 130 horsepower).

Facility and Unit Identifier 

Information

Emission Data

§98.236(z)(1)(i) The type of combustion unit. Facility and Unit Identifier 

Information

Emission Data

§98.236(z)(2) Indicate whether the combustion units subject to reporting under §98.232 

include external fuel combustion units with a rated heat greater than 5 

MMBtu/hr, internal fuel combustion units, excluding compressordrivers, with a rated heat capacity greater than 1 MMBtu/hr (or the 

equivalent of 130 horsepower), or compressor-drivers.

Facility and Unit Identifier 

Information

Emission Data

§98.236(z)(2)(i) The type of combustion unit. Facility and Unit Identifier 

Information

Emission Data

Onshore Petroleum and Natural Gas Production 

§98.236(aa)(1)(ii)(A) For each unique sub-basin category, the state. Facility and Unit Identifier 

Information

Emission Data

§98.236(aa)(1)(ii)(B) For each unique sub-basin category, the county. Facility and Unit Identifier 

Information

Emission Data

Onshore Natural Gas Processing 

§98.236(aa)(3)(i) The quantity of natural gas received at the gas processing plant in the 

calendar year, in thousand standard cubic feet.

Raw Materials Consumed 

that are Not Inputs to 

Emission Equations

CBI

§98.236(aa)(3)(ii) The quantity of processed (residue) gas leaving the gas processing plant, 

in thousand standard cubic feet.

Production/Throughput 

Data that are Not Inputs to 

Emission Equations

CBI

Missing Data Provisions

§98.236(bb)(1) For quarterly measurements, report the total number of quarters that a 

missing data procedure was used.

Missing Data Provisions Emission Data

13
Table 2. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to the Unit/Process Operating Characteristics and the Unit/Process Static Characteristics Data Categories

Rule Citation Final Data Element Category Assignment

Final 

Determination

Acid Gas Removal

§98.236(d)(1)(iv) Whether any CO2 emissions from the acid gas removal unit are 

recovered and transferred outside the facility

Unit/Process Operating Characteristics 

that are Not Inputs to Emission Equations

Not CBI

Dehydrators

§98.236(e)(1)(xvii) For each glycol dehydrator that has an annual average daily 

natural gas throughput greater than or equal to 0.4 MMscfd, 

whether any dehydrator emissions are vented to the atmosphere 

without being routed to a flare or regenerator firebox/fire tubes.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission Equations

Not CBI

§98.236(e)(2)(ii) For glycol dehydrators with an annual average daily natural gas 

throughput less than 0.4 MMscfd, the total number of 

dehydrators venting to a vapor recovery device.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission Equations

Not CBI

§98.236(e)(2)(iii) For glycol dehydrators with an annual average daily natural gas 

throughput less than 0.4 MMscfd, type of control device(s) other 

than a vapor recovery device or a flare or regenerator 

firebox/fire tubes, and the total number of dehydrators vented to 

each type of control device.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission Equations

Not CBI

§98.236(e)(2)(iv) For glycol dehydrators with an annual average daily natural gas 

throughput less than 0.4 MMscfd, whether any dehydrator 

emissions are vented to a flare or regenerator firebox/fire tubes.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission Equations

Not CBI

§98.236(e)(2)(iv)(A) For glycol dehydrators with an annual average daily natural gas

throughput less than 0.4 MMscfd and vent to a flare or 

regenerator firebox, the total number of dehydrators.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission Equations

Not CBI

§98.236(e)(3)(i) For dehydrators that use desiccant, whether any dehydrator 

emissions were vented to a vapor recovery device.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission Equations

Not CBI

§98.236(e)(3)(i) For dehydrators that use desiccant, the total number of 

dehydrators vented to a vapor recovery device.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission Equations

Not CBI

§98.236(e)(3)(i) For dehydrators that use desiccant, whether any dehydrator 

emissions were vented to a control device other than a vapor 

recovery device or a flare or regenerator firebox/fire tubes.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission Equations

Not CBI

14
Table 2. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to the Unit/Process Operating Characteristics and the Unit/Process Static Characteristics Data Categories

(continued)

Rule Citation Final Data Element Category Assignment

Final 

Determination

§98.236(e)(3)(i) For dehydrators that use desiccant and vented to a control device 

other than a vapor recovery device or a flare or regenerator 

firebox/fire tubes, the control device type.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(e)(3)(i) For dehydrators that use desiccant, the number of dehydrators 

vented to a control device other than a vapor recovery device or a 

flare or regenerator firebox/fire tubes.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(e)(3)(i) For dehydrators that use desiccant, whether any dehydrator 

emissions were vented to a flare or regenerator firebox/fire tubes.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(e)(3)(i) For dehydrators that use desiccant and vented to a flare or 

regenerator firebox, the total number of dehydrators.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

Liquids Unloading

§98.236(f) You must indicate whether well venting for liquids unloading 

occurs at the facility.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(f)(1)(iv) For each Sub-basin and well tubing diameter and pressure group 

for which you used Calculation Method 1 (reported separately for 

wells with plunger lifts and wells without plunger lifts), the count 

of wells vented to the atmosphere for this group.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

Gas Well Completions and Workovers with Hydraulic Fracturing

§98.236(g) Whether the facility had any gas well completions or workovers 

with hydraulic fracturing in the calendar year.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

15
Table 2. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to the Unit/Process Operating Characteristics and the Unit/Process Static Characteristics Data Categories

(continued)

Rule Citation Final Data Element Category Assignment

Final 

Determination

§98.236(g)(5)(i)4 If you used Equation W-10A to calculate annual volumetric total 

gas emissions, then you must report the cumulative gas flowback

time, in hours, for each sub-basin, from when gas is first detected 

until sufficient quantities are present to enable separation, and the 

cumulative flowback time, in hours, for each sub-basin, after 

sufficient quantities of gas are present to enable separation (sum 

of “Tp,i” and “Tp,s” values used in Equation W-10A).

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

Gas Well Completions and Workovers without Hydraulic Fracturing

§98.236(h) Indicate whether the facility had any gas well completions 

without hydraulic fracturing or any gas well workovers without 

hydraulic fracturing, and if the activities occurred with or without 

flaring.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(h)(1)(ii) For each sub-basin with gas well completions without hydraulic 

fracturing and without flaring, the number of completions that 

vented gas to the atmosphere.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(h)(1)(iv)5 Average daily gas production rate for all completions without 

hydraulic fracturing in the sub-basin without flaring, in standard 

cubic feet per hour (average of all “Vp” as used in Equation W13B).

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(h)(2)(ii) For each sub-basin with gas well completions without hydraulic 

fracturing and with flaring, the number of well completions that 

flared gas.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

4 Reporters may delay reporting of these data elements for a period of two years in cases where wildcat wells and/or delineation wells are the only wells in a subbasin for which data was collected. Note that the determination applies only in situations where data are available for multiple wells. The data element is an input 

when data are available for only a single well; see the Inputs memorandum for an evaluation of whether release of inputs data is likely to result in substantial 

competitive harm.

5 Reporters may delay reporting of this data element for a period of two years in cases where wildcat wells and/or delineation wells are the only wells in a subbasin for which data was collected. Note that the determination applies only in situations where data are available for multiple wells. The data element is an input 

when data are available for only a single well; see the Inputs memorandum for an evaluation of whether release of inputs data is likely to result in substantial 

competitive harm.

16

 
Table 2. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to the Unit/Process Operating Characteristics and the Unit/Process Static Characteristics Data Categories

(continued)

Rule Citation Final Data Element Category Assignment

Final 

Determination

§98.236(h)(2)(iii) Total number of hours that gas vented to a flare during venting for 

all completions in the sub-basin category (sum of all “Tp” for 

completions that vented to a flare as used in Equation W-13B).

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(h)(2)(iv)6 Average daily gas production rate for all completions without 

hydraulic fracturing in the sub-basin with flaring, in standard 

cubic feet per hour (average of all “Vp” from Equation W-13B).

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

Blowdown Vent Stacks

§98.236(i)(1)(i)7 Total number of blowdowns in the calendar year for the 

equipment or event type (sum equation variable “N” from 

Equation W-14A or Equation W-14B of this subpart, for all 

unique physical volumes for the equipment or event type).

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

Onshore Production Storage Tanks

§98.236(j) If you used Calculation Method 1 or 2 and any of the atmospheric 

tanks are observed to have malfunctioning dump valves, indicate 

that dump valves were malfunctioning.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(j)(2)(ii)(B) For each sub-basin with atmospheric tanks whose emissions were 

calculated using Calculation Method 3, the number of 

atmospheric tanks that did not control emissions with flares.

Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(j)(2)(iii)(B) For each sub-basin with atmospheric tanks whose emissions were 

calculated using Calculation Method 3, the number of 

atmospheric tanks that controlled emissions with flares.

Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

6 Reporters may delay reporting of this data element for a period of two years in cases where wildcat wells and/or delineation wells are the only wells in a subbasin for which data was collected. Note that the determination applies only in situations where data are available for multiple wells. The data element is an input 

when data are available for only a single well; see the Inputs memorandum for an evaluation of whether release of inputs data is likely to result in substantial 

competitive harm.

7 Note that the determination applies only in situations where data are available for multiple unique physical volumes for a particular equipment type. The data 

element is an input when data are available for only a single unique physical volume for a particular equipment type; see the Inputs memorandum for an 

evaluation of whether release of inputs data is likely to result in substantial competitive harm.

17

 
Table 2. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to the Unit/Process Operating Characteristics and the Unit/Process Static Characteristics Data Categories

(continued)

Rule Citation Final Data Element Category Assignment

Final 

Determination

§98.236(j)(3)(ii)8 If any of the gas-liquid separator liquid dump valves did not close 

properly during the reporting year, the total time, in hours, the 

dump valves on gas-liquid separators did not close properly (Sum 

of the “Tn” values used in Equation W-16).

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

Transmission Storage Tanks

§98.236(k)(1)(iii) For each transmission storage tank vent stack, indicate whether 

scrubber dump valve leakage occurred for the transmission 

storage vent.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(k)(1)(iv) For each transmission storage tank vent stack, indicate if there is a 

flare attached to the vent stack.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(k)(2)(iii) For scrubber dump valve leakage vented directly to the 

atmosphere, duration of time that the leak is counted as having 

occurred, in hours.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(k)(3)(iii) For scrubber dump valve leakage vented to a flare, duration of 

time that flaring occurred, in hours.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

Associated Natural Gas

§98.236(m) You must indicate whether any associated gas was vented or 

flared during the calendar year.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(m)(2) For each sub-basin, indicate whether any associated gas was 

vented without flaring.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

8 Note that the determination applies only in situations where data are available for multiple separators with dump valves that did not close properly. The data 

element is an input when data are available for only a single separator with a dump valve that did not close properly; see the Inputs memorandum for an 

evaluation of whether release of inputs data is likely to result in substantial competitive harm.

18

 
Table 2. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to the Unit/Process Operating Characteristics and the Unit/Process Static Characteristics Data Categories

(continued)

Rule Citation Final Data Element Category Assignment

Final 

Determination

§98.236(m)(3) For each sub-basin, indicate whether any associated gas was 

flared.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(m)(5)9 For each sub-basin, the volume of oil produced during time 

periods in which associated gas was vented or flared (barrels).

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(m)(6)107 For each sub-basin, the total volume of associated gas sent to 

sales during time periods in which associated gas was vented or 

flared (scf).

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

Centrifugal Compressors

§98.236(o)(1)(iv) Indicate whether the compressor was measured in operatingmode.Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(o)(1)(v) Indicate whether the compressor was measured in not-operatingdepressurized–mode.Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(o)(1)(vii) Indicate which, if any, compressor sources are routed to a flare. Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(o)(1)(viii) Indicate which, if any, compressor sources have vapor recovery. Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

9 Reporters may delay reporting of this data element for a period of two years in cases where wildcat wells and/or delineation wells are the only wells in a subbasin for which data was collected. Note that the determination applies only in situations where data are available for multiple wells. The data element is an input 

when data are available for only a single well; see the Inputs memorandum for an evaluation of whether release of inputs data is likely to result in substantial 

competitive harm.

10 Reporters may delay reporting of this data element for a period of two years in cases where wildcat wells and/or delineation wells are the only wells in a subbasin for which data was collected. Note that the determination applies only in situations where data are available for multiple wells; the data element is an input 

when data are available for only a single well; see the Inputs memorandum for an evaluation of whether release of inputs data is likely to result in substantial 

competitive harm.

19

 
Table 2. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to the Unit/Process Operating Characteristics and the Unit/Process Static Characteristics Data Categories

(continued)

Rule Citation Final Data Element Category Assignment

Final 

Determination

§98.236(o)(1)(ix) Indicate which, if any, compressor source emissions are captured 

for fuel use or are routed to a thermal oxidizer.

Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(o)(1)(x) Indicate whether the compressor has blind flanges installed and 

associated dates.

Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(o)(1)(xi) Indicate whether the compressor has wet or dry seals. Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(o)(1)(xiii) Power output of compressor driver (hp). Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(o)(1)(xiv) Indicate whether the compressor had a scheduled depressurized 

shutdown during the reporting year.

Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(o)(2)(ii)(E) If the leak or vent is routed to flare, combustion, or vapor 

recovery, report the percentage of time that the respective device 

was operational when the compressor source emissions were 

routed to the device.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(o)(3)(i)(F) If the measurement is for a manifolded group of compressor 

sources, indicate whether the measurement location is prior to or 

after comingling with non-compressor emission sources.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(o)(4)(iii) Indicate whether the measured volume of flow during the 

reporting year includes compressor blowdown emissions as 

allowed for in §98.233(o)(3)(ii) and (o)(5)(ii).

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(o)(4)(iv) If the measurement method is for a manifolded group of 

compressor sources, indicate whether the measurement location is 

prior to or after comingling with non-compressor emission 

sources.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

Reciprocating Compressors

§98.236(p)(1)(viii) Indicate which, if any, compressor sources are part of a 

manifolded group of compressor sources.

Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(p)(1)(ix) Indicate which, if any, compressor sources are routed to a flare. Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

20
Table 2. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to the Unit/Process Operating Characteristics and the Unit/Process Static Characteristics Data Categories

(continued)

Rule Citation Final Data Element Category Assignment

Final 

Determination

§98.236(p)(1)(x) Indicate which, if any, compressor sources have vapor recovery. Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(p)(1)(xi) Indicate which, if any, compressor source emissions are captured 

for fuel use or are routed to a thermal oxidizer.

Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(p)(1)(xii) Indicate whether the compressor has blind flanges installed and 

associated dates.

Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(p)(1)(xiii) Power output of compressor driver (hp). Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(p)(1)(xiv) Indicate whether the compressor had a scheduled depressurized

shutdown during the reporting year.

Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(p)(2)(ii)(E) If the leak or vent is routed to flare, combustion, or vapor 

recovery, report the percentage of time that the respective device 

was operational when the compressor source emissions were 

routed to the device.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(p)(3)(i)(F) If the measurement is for a manifolded group of compressor 

sources, indicate whether the measurement location is prior to or 

after comingling with non-compressor emission sources.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(p)(4)(iii) Indicate whether the measured volume of flow during the 

reporting year includes compressor blowdown emissions as 

allowed for in §98.233(o)(3)(ii) and (o)(5)(ii).

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(p)(4)(iv) If the measurement method is for a manifolded group of 

compressor sources, indicate whether the measurement location is 

prior to or after comingling with non-compressor emission 

sources.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

Equipment Leaks Surveys

§98.236(q)(2)(iii) Average time the surveyed components are assumed to be leaking 

and operational, in hours (average of Tp,z in Equation W-30 of this 

subpart for the component type).

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

21
Table 2. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to the Unit/Process Operating Characteristics and the Unit/Process Static Characteristics Data Categories

(continued)

Rule Citation Final Data Element Category Assignment

Final 

Determination

§98.236(q)(3)(ii) Number of meter/regulator runs at above grade transmissiondistribution transfer stations surveyed in the calendar year

(“CountMR,y” from Equation W-31 of this subpart, for the current 

calendar year).

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(q)(3)(iii) Average time that meter/regulator runs surveyed in the calendar 

year were operational, in hours (average of Tw,y in Equation W-31 

of this subpart, for the current calendar year).

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(q)(3)(v) Number of meter/regulator runs at above grade transmissiondistribution transfer stations surveyed in current leak survey cycle

(sum of “CountMR,y” from Equation W-31 of this subpart, for all 

calendar years included in the leak survey cycle).

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(q)(3)(vi) Average time that meter/regulator runs surveyed in the current 

leak survey cycle were operational, in hours (average of “Tw,y” 

from Equation W-31 of this subpart, for all years included in the 

leak survey cycle).

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

EOR Injection Pumps

§98.236(w) Whether CO2 EOR injection was used at your facility during the 

calendar year.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

§98.236(w) You must indicate whether any EOR injection pump blowdowns 

occurred during the calendar year.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

EOR Hydrocarbon Liquids

§98.236(x) Whether hydrocarbon liquids were produced through EOR 

operations.

Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

Combustion Equipment for Onshore Petroleum and Natural Gas Production and Natural Gas Distribution Facilities

§98.236(z)(1)(ii) The total number of combustion units. Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

22
Table 2. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to the Unit/Process Operating Characteristics and the Unit/Process Static Characteristics Data Categories

(continued)

Rule Citation Final Data Element Category Assignment

Final 

Determination

§98.236(z)(2)(ii) The type of fuel combusted. Unit/Process Operating Characteristics 

that are Not Inputs to Emission 

Equations

Not CBI

Onshore Petroleum and Natural Gas Production 

§98.236(aa)(1)(ii)(C) For each unique sub-basin category, the formation type. Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(aa)(1)(ii)(D) For each unique sub-basin category, the number of producing 

wells at the end of the calendar year.

Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(aa)(1)(ii)(E) For each unique sub-basin category, the number of producing 

wells acquired during the calendar year.

Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(aa)(1)(ii)(F) For each unique sub-basin category, the number of producing 

wells divested during the calendar year.

Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(aa)(1)(ii)(G) For each unique sub-basin category, the number of wells 

completed during the calendar year.

Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(aa)(1)(ii)(H) For each unique sub-basin category, the number of wells 

permanently taken out of production (i.e., plugged and 

abandoned) during the calendar year.

Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(aa)(1)(ii)(I) For each unique sub-basin category, the average mole fraction of 

CH4 in produced gas.

Unit/ Process Operating Characteristics 

That are Not Inputs to Emission 

Equations

Not CBI

§98.236(aa)(1)(ii)(J) For each unique sub-basin category, the average mole fraction of 

CO2 in produced gas.

Unit/ Process Operating Characteristics 

That are Not Inputs to Emission 

Equations

Not CBI

Onshore Natural Gas Processing 

§98.236(aa)(3)(vii) Whether the facility fractionates NGLs. Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

23
Table 2. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to the Unit/Process Operating Characteristics and the Unit/Process Static Characteristics Data Categories

(continued)

Rule Citation Final Data Element Category Assignment

Final 

Determination

Natural Gas Transmission Compression

§98.236(aa)(4)(ii) Number of compressors. Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

§98.236(aa)(4)(iii) The total compressor power rating for all compressors combined, 

in horsepower.

Unit/ Process Operating Characteristics 

That are Not Inputs to Emission 

Equations

Not CBI

Underground Natural Gas Storage

§98.236(aa)(5)(i) The quantity of gas injected into storage in the calendar year, in 

thousand standard cubic feet.

Unit/ Process Operating Characteristics 

That are Not Inputs to Emission 

Equations

Not CBI

§98.236(aa)(5)(ii) The quantity of gas withdrawn from storage in the calendar year, 

in thousand standard cubic feet.

Unit/ Process Operating Characteristics 

That are Not Inputs to Emission 

Equations

Not CBI

§98.236(aa)(5)(iii) The total storage capacity, in thousand standard cubic feet. Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

LNG Import and Export Equipment

§98.236(aa)(6) For LNG import equipment, the quantity of LNG imported in the 

calendar year, in thousand standard cubic feet. 

Unit/ Process Operating Characteristics 

That are Not Inputs to Emission 

Equations

Not CBI

§98.236(aa)(7) For LNG export equipment, the quantity of LNG exported in the 

calendar year, in thousand standard cubic feet.

Unit/ Process Operating Characteristics 

That are Not Inputs to Emission 

Equations

Not CBI

LNG Storage

§98.236(aa)(8)(i) The quantity of LNG added into storage in the calendar year, in 

thousand standard cubic feet.

Unit/ Process Operating Characteristics 

That are Not Inputs to Emission 

Equations

Not CBI

§98.236(aa)(8)(ii) The quantity of LNG withdrawn from storage in the calendar 

year, in thousand standard cubic feet.

Unit/ Process Operating Characteristics 

That are Not Inputs to Emission 

Equations

Not CBI

24
Table 2. Final Data Category Assignments and Confidentiality Determinations for New/Substantially Revised Data Elements 

Assigned to the Unit/Process Operating Characteristics and the Unit/Process Static Characteristics Data Categories

(continued)

Rule Citation Final Data Element Category Assignment

Final 

Determination

§98.236(aa)(8)(iii) The total LNG storage capacity in the calendar year, in thousand 

standard cubic feet.

Unit/Process Static Characteristics that 

are Not Inputs to Emission Equations

Not CBI

Natural Gas Distribution

§98.236(aa)(9)(i) The quantity of natural gas received at all custody transfer 

stations, in thousand standard cubic feet.

Unit/ Process Operating Characteristics 

That are Not Inputs to Emission 

Equations

Not CBI

§98.236(aa)(9)(ii) The quantity of natural gas withdrawn from in-system storage in 

the reporting year in thousand standard cubic feet.

Unit/ Process Operating Characteristics 

That are Not Inputs to Emission 

Equations

Not CBI

§98.236(aa)(9)(iii) The quantity of natural gas added to in-system storage in the 

reporting year in thousand standard cubic feet.

Unit/ Process Operating Characteristics 

That are Not Inputs to Emission 

Equations

Not CBI

§98.236(aa)(9)(iv) The quantity of natural gas delivered to end users, in thousand 

standard cubic feet. This value does not include stolen gas, or gas 

that is otherwise unaccounted for.

Unit/ Process Operating Characteristics 

That are Not Inputs to Emission 

Equations

Not CBI

§98.236(aa)(9)(v) The quantity of natural gas transferred to third parties such as 

other LDCs or pipelines, in thousand standard cubic feet. This 

value does not include stolen gas, or gas that is otherwise 

unaccounted for.

Unit/ Process Operating Characteristics 

That are Not Inputs to Emission 

Equations

Not CBI

§98.236(aa)(9)(vi) The quantity of natural gas consumed by the LDC for operational 

purposes, in thousand standard cubic feet.

Unit/ Process Operating Characteristics 

That are Not Inputs to Emission 

Equations

Not CBI

§98.236(aa)(9)(vii) The estimated quantity of gas stolen in the calendar year, in 

thousand standard cubic feet.

Unit/ Process Operating Characteristics 

That are Not Inputs to Emission 

Equations

Not CBI

25
Table 3. Final Confidentiality Determinations for Data Elements Not Assigned to a Data Category

Rule Citation Final Data Element Final Determination

Onshore Petroleum and Natural Gas Production 

§98.236(j)(2)(i)(A)11 The total annual oil throughput that is sent to atmospheric tanks in the basin, in barrels. Not CBI

§98.236(aa)(1)(i)(A) The quantity of gas produced in the calendar year from wells, in thousand standard cubic feet. This includes 

gas that is routed to a pipeline, vented or flared, or used in field operations. This does not include gas injected 

back into reservoirs or shrinkage resulting from lease condensate production.

Not CBI

§98.236(aa)(1)(i)(B) The quantity of gas produced in the calendar year for sales, in thousand standard cubic feet. Not CBI

§98.236(aa)(1)(i)(C) For each basin, the quantity of crude oil and condensate produced in the calendar year for sales, in barrels. Not CBI

Offshore Petroleum and Natural Gas Production

§98.236(aa)(2)(i) The total quantity of gas handled at the offshore platform in the calendar year, in thousand standard cubic 

feet, including production volumes and volumes transferred via pipeline from another location.

Not CBI

§98.236(aa)(2)(ii) The total quantity of oil and condensate handled at the offshore platform in the calendar year, in barrels, 

including production volumes and volumes transferred via pipeline from another location.

Not CBI

11Reporters may delay reporting of this data element for a period of two years in cases where wildcat wells and/or delineation wells are the only wells in a subbasin for which data was collected. 

26

 
Table 4. Data Elements With No Confidentiality Determination

Rule Citation Data Element

Onshore Natural Gas Processing

§98.236(aa)(3)(iii) The cumulative quantity of all NGLs (bulk and fractionated) received at the gas processing plant in the calendar year, in barrels.

§98.236(aa)(3)(iv) The cumulative quantity of all NGLs (bulk and fractionated) leaving the gas processing plant in the calendar year, in barrels.

§98.236(aa)(4)(i) The quantity of gas transported through the compressor station in the calendar year, in thousand standard cubic feet.

§98.236(aa)(4)(iv) The average upstream pipeline pressure, in pounds per square inch gauge.

§98.236(aa)(4)(v) The average downstream pipeline pressure, in pounds per square inch gauge.

27
Table 5. Proposed Data Elements Removed From Tables 1 Through 3 or Moved to a Different Table Since Proposal

Rule Citation Proposed Data Element Reason for Change Since Proposal

Acid Gas Removal

§98.236(d)(2)(i)(B) If you used Calculation Method 1 or 2 in §98.233(d), the total 

annual volume of gas vented from the acid gas removal unit, in 

cubic feet.

This data element is an input to emissions estimation equations 

for Calculation Methods 1 and 2 and was included in the Inputs 

memorandum at proposal. It is also included in the final Inputs 

memorandum.

Dehydrators

§98.236(e)(2)(i) For glycol dehydrators with an annual average daily natural gas 

throughput less than 0.4 million standard cubic feet per day, the 

total number of dehydrators at the facility.

This data element is equivalent to the current data element in 

§98.236(c)(4)(ii)(A). The final confidentiality determination of 

“not CBI” for this data element was documented in 

“Memorandum-Final Data Category Assignments and 

Confidentiality Determinations for the 2012 Final CBI Rule” in 

Docket ID No. EPA-HQ-OAR-2011-0028.

§98.236(e)(3)(i) For dehydrators that use desiccant, the total number of 

dehydrators at the facility.

This data element is equivalent to the current data element in 

§98.236(c)(4)(iii)(A). The final confidentiality determination of 

“not CBI” for this data element was documented in 

“Memorandum-Final Data Category Assignments and 

Confidentiality Determinations for the 2012 Final CBI Rule” in 

Docket ID No. EPA-HQ-OAR-2011-0028.

Gas Well Completions and Workovers with Hydraulic Fracturing

§98.236(g)(3) For each sub-basin and well type combination with hydraulic 

fracturing, the total number of completions and the total number 

of workovers.

These data elements are equivalent to the current data elements in 

§98.236(c)(6)(i)(A) and (C). The final confidentiality 

determination of “not CBI” for these data elements was 

documented in “Memorandum-Final Data Category Assignments 

and Confidentiality Determinations for the 2012 Final CBI Rule” 

in Docket ID No. EPA-HQ-OAR-2011-0028.

§98.236(g)(6) If you used Equation W-10B to calculate annual volumetric total 

gas emissions for completions that vent gas to the atmosphere, 

then you must report the vented natural gas volume, in standard 

cubic feet, for each well in the sub-basin (“FVs,p” in Equation W10B).

This data element is an input to emissions estimation Equation 

W-10B and was included in the Inputs memorandum at proposal.

It is also included in the final Inputs memorandum.

28
Table 5. Proposed Data Elements Removed From Tables 1 Through 3 or Moved to a Different Table Since Proposal 

(continued)

Rule Citation Proposed Data Element Reason for Change Since Proposal

Gas Well Completions and Workovers without Hydraulic Fracturing

§98.236(h)(1)(iii) Total number of hours that gas vented directly to the atmosphere 

during venting for all completions in the sub-basin category (the 

sum of all “Tp” for completions that vented to the atmosphere as 

used in Equation W-13B).

This data element is equivalent to the current data element in 

§98.236(c)(6)(ii)(C). The final confidentiality determination of 

“not CBI” for this data element was documented in 

“Memorandum-Final Data Category Assignments and 

Confidentiality Determinations for the 2012 Final CBI Rule” in 

Docket ID No. EPA-HQ-OAR-2011-0028.

Well Testing

§98.236(l)(1)(iv) If oil well testing is performed where emissions are not vented to 

a flare, the average flow rate for well(s) tested, in barrels of oil 

per day

The EPA has determined that this data element is an input to 

emissions estimation Equation W-17A and has moved discussion 

of this data element to the final Inputs memorandum and section 

III.B of the preamble to the final amendments.

§98.236(l)(2)(iv) If oil well testing is performed where emissions are vented to a 

flare, the average flow rate in barrels of oil per day for well(s) 

tested.

The EPA has determined that this data element is an input to 

emissions estimation Equation W-17A and has moved discussion 

of this data element to the final Inputs memorandum and section 

III.B of the preamble to the final amendments.

§98.236(l)(3)(iii) If gas well testing is performed where emissions are not vented 

to a flare, the average annual production rate in actual cubic feet 

per day for well(s) tested.

The EPA has determined that this data element is an input to 

emissions estimation Equation W-17B and has moved discussion 

of this data element to the final Inputs memorandum and section 

III.B of the preamble to the final amendments.

§98.236(l)(4)(iii) If gas well testing is performed where emissions are vented to a 

flare, the average annual production rate in actual cubic feet per 

day for well(s) tested.

The EPA has determined that this data element is an input to 

emissions estimation Equation W-17B and has moved discussion 

of this data element to the final Inputs memorandum and section 

III.B of the preamble to the final amendments.

Centrifugal Compressors

§98.236(o)(1)(xiv) Year compressor was installed. For reasons discussed in the 2014 comment response document, 

the EPA did not finalize this data element.

§98.236(o)(1)(xv) Compressor model name and description. For reasons discussed in the 2014 comment response document, 

the EPA did not finalize this data element.

29
Table 5. Proposed Data Elements Removed From Tables 1 Through 3 or Moved to a Different Table Since Proposal 

(continued)

Rule Citation Proposed Data Element Reason for Change Since Proposal

Reciprocating Compressors

§98.236(p)(1)(xiv) Year compressor was installed. For reasons discussed in the 2014 comment response document, 

the EPA did not finalize this data element.

§98.236(p)(1)(xv) Compressor model name and description. For reasons discussed in the 2014 comment response document, 

the EPA did not finalize this data element.

Combustion

§98.236(z)(2)(i) The type of combustion unit. For reasons discussed in the 2014 comment response document, 

the EPA did not finalize this data element.

Onshore Petroleum and Natural Gas Production

§98.236(aa)(1)(i)(D) For each basin, the quantity of lease condensate produced in the 

calendar year for sales, in barrels.

For reasons discussed in the 2014 comment response document, 

this data element was modified and combined with the data 

element in §98.236(aa)(1)(i)(C) of the final amendments.

Offshore Petroleum and Natural Gas Production

§98.236(aa)(2)(iii) The quantity of condensate produced from the offshore platform 

in the calendar year for sales, in barrels.

For reasons discussed in the 2014 comment response document, 

this data element was modified and combined with the data 

element in §98.236(aa)(2)(ii) of the final amendments.

Onshore Natural Gas Processing

§98.236(aa)(3)(i) The quantity of natural gas received at the gas processing plant 

in the calendar year, in thousand standard cubic feet.

For reasons discussed in section III.B of the preamble to the final 

amendments, the EPA decided to change the confidentiality 

determination for this data element from “not CBI” to “CBI”. As 

a result, the determination is consistent with the categorical 

determination for this data element, and it has been moved to 

From Table 3 to Table 1. This data element is classified in the 

“Raw Materials Consumed” data category.

§98.236(aa)(3)(ii) The quantity of processed (residue) gas leaving the gas 

processing plant, in thousand standard cubic feet.

For reasons discussed in section III.B of the preamble to the final 

amendments, the EPA decided to change the confidentiality 

determination for this data element from “not CBI” to “CBI”. As 

a result, the determination is consistent with the categorical 

determination for this data element, and it has been moved to 

From Table 3 to Table 1. This data element is classified in the 

“Production/Throughput” data category.

30
Table 5. Proposed Data Elements Removed From Tables 1 Through 3 or Moved to a Different Table Since Proposal 

(continued)

Rule Citation Proposed Data Element Reason for Change Since Proposal

§98.236(aa)(3)(iii) The cumulative quantity of all NGLs (bulk and fractionated) 

received at the gas processing plant in the calendar year, in 

barrels.

For reasons discussed in section III.B of the preamble to the final 

amendments, the EPA decided not to finalize a confidentiality 

determination for this data element, and moved it from Table 3 to 

Table 4.

§98.236(aa)(3)(iv) The cumulative quantity of all NGLs (bulk and fractionated) 

leaving the gas processing plant in the calendar year, in barrels.

For reasons discussed in section III.B of the preamble to the final 

amendments, the EPA decided not to finalize a confidentiality 

determination for this data element, and moved it from Table 3 to 

Table 4.

§98.236(aa)(4)(i) The quantity of gas transported through the compressor station in 

the calendar year, in thousand standard cubic feet.

For reasons discussed in section III.B of the preamble to the final 

amendments, the EPA decided not to finalize a confidentiality 

determination for this data element, and moved it from Table 2 to 

Table 4.

§98.236(aa)(4)(iv) The average upstream pipeline pressure, in pounds per square 

inch gauge.

For reasons discussed in section III.B of the preamble to the final 

amendments, the EPA decided not to finalize a confidentiality 

determination for this data element, and moved it from Table 2 to 

Table 4.

§98.236(aa)(4)(v) The average downstream pipeline pressure, in pounds per square 

inch gauge.

For reasons discussed in section III.B of the preamble to the final 

amendments, the EPA decided not to finalize a confidentiality 

determination for this data element, and moved it from Table 2 to 

Table 4.

31
Table 6. Data Elements Added to Tables 1 and 2 Since Proposal

Rule Citation Final Data Element Data Category Confidentiality Determination and Rationale

Dehydrators

§98.236(e)(2)(iii) For glycol dehydrators with an annual average daily 

natural gas throughput less than 0.4 MMscfd and 

vented to a control device other than a vapor recovery 

device or a flare or regenerator firebox/fire tubes, the 

type of control device(s).

Unit/ Process Operating 

Characteristics That are 

Not Inputs to Emission 

Equations

Although §98.236(e)(2)(i) of the proposed 

amendments specified that the type of control 

device must be reported, the discussion in Table 2 

of the preamble to the proposed amendments did 

not mention reporting the type of control device. 

This data element is identical to the data element

in §98.236(e)(3)(i) for reporting the type of 

control device used to control emissions from 

dehydrators that use desiccant. The proposed 

confidentiality determination of “not CBI” for 

§98.236(e)(3)(i) is being finalized. Therefore, we 

are also finalizing a determination of “not CBI” 

for the type of control device data element in 

§98.236(e)(2)(iii).

Gas Well Completions and Workovers With Hydraulic Fracturing

§98.236(g)(5)(i) If you used Equation W-10A to calculate annual 

volumetric total gas emissions, then you must report 

the cumulative gas flowback time, in hours, for each 

sub-basin, from when gas is first detected until 

sufficient quantities are present to enable separation, 

and the cumulative flowback time, in hours, for each 

sub-basin, after sufficient quantities of gas are present 

to enable separation (sum of “Tp,i” values and sum of

“Tp,s” values used in Equation W-10A).

Unit/ Process Operating 

Characteristics That are 

Not Inputs to Emission 

Equations

This data element is an input if a completion or 

workover was conducted for only one well in a 

sub-basin and well type combination category. 

Thus, this data element is also discussed in the 

final Inputs memorandum. However, the data 

element is not an input when more than one 

completion or workover is conducted in a 

category. We are finalizing a confidentiality 

determination of “not CBI” for this data element 

because the cumulative gas flowback time for 

multiple completions or workovers would not 

disclose information on individual wells and is 

not likely to cause substantial competitive harm.

32
Table 6. Data Elements Added to Tables 1 and 2 Since Proposal (continued)

Rule Citation Final Data Element Data Category Confidentiality Determination and Rationale

Onshore Production Storage Tanks 

§98.236(j)(2)(ii)(B) The number of atmospheric tanks in the sub-basin that 

did not control emissions with flares.

Unit/ Process Operating 

Characteristics That are 

Not Inputs to Emission 

Equations

These data elements were inadvertently omitted 

from the discussion of confidentiality 

determinations in the preamble to the proposed 

amendments. These data elements are comparable 

to the data elements in §98.236(e)(2) and (e)(3) 

for the counts of dehydrators that vent to 

atmosphere, flares, vapor recovery, or other types 

of control devices. The data elements 

in§98.236(e)(2) and (e)(3) were proposed as “not 

CBI”, and they are being finalized as proposed. 

Thus, we are also finalizing confidentiality 

determinations of “not CBI” for the data elements 

in §98.236(j)(2)(ii)(B) and (j)(2)(iii)(B). 

§98.236(j)(2)(iii)(B) The number of atmospheric tanks in the sub-basin that 

controlled emissions with flares.

Unit/ Process Operating 

Characteristics That are 

Not Inputs to Emission 

Equations

Transmission Storage Tanks

§98.236(k)(2)(ii) Measured scrubber dump valve leak rate vented 

directly to the atmosphere (average leak rate from a 

continuous flow measurement device), in standard 

cubic feet per hour.

Emissions These data elements were inadvertently omitted 

from the discussion of confidentiality 

determinations in the preamble to the proposed 

amendments and supporting memoranda. The 

measured scrubber dump valve leak rates are 

assigned to the Emissions data category which has 

a categorical determination of “not CBI”. Thus, 

we are finalizing a confidentiality determination 

of “not CBI” for the data elements in 

§98.236(k)(2)(ii). The duration of time that a leak 

occurred or was vented to a flare is comparable to 

the data element in §98.236(j)(3)(ii) for the total 

time that dump valves on gas-liquid separators did 

not close properly. The proposed confidentiality 

determination of “not CBI” for the data element in 

§98.236(j)(3)(ii) is being finalized as proposed. 

Thus, we are also finalizing a confidentiality 

determination of “not CBI” for the data elements 

in §98.236(k)(2)(iii) and (k)(3)(iii).

§98.236(k)(2)(iii) Duration of time that the leak is counted as having 

occurred, in hours.

Unit/ Process Operating 

Characteristics That are 

Not Inputs to Emission 

Equations

§98.236(k)(3)(ii) Measured scrubber dump valve leak rate vented for 

flare (average leak rate from a continuous flow 

measurement device), in standard cubic feet per hour.

Emissions

§98.236(k)(3)(iii) Duration of time that flaring occurred, in hours. Unit/ Process Operating 

Characteristics That are 

Not Inputs to Emission 

Equations

33
Table 6. Data Elements Added to Tables 1 and 2 Since Proposal (continued)

Rule Citation Final Data Element Data Category Confidentiality Determination and Rationale

Centrifugal Compressors

§98.236(o)(1)(x) For a centrifugal compressor with blind flanges, 

indicate the associated dates when it has blind flanges.

Unit/ Process Static 

Characteristics That are 

Not Inputs to Emission 

Equations

See entry for §98.236(o)(3)(i)(F), (o)(4)(iii), and 

(o)(4)(iv).

§98.236(o)(2)(i)(A) Centrifugal compressor name or ID. Facility and Unit 

Identifier Information

These data elements for centrifugal compressors 

were inadvertently omitted from the discussion of 

confidentiality determinations in Table 1 of this 

memorandum for the proposed amendments. 

However, they are identical to elements in 

§98.236(p)(2)(i)(A) through (C) which were 

assigned to the same data category and for which 

the proposed confidentiality determination was 

“not CBI”. The confidentiality determinations for 

§98.236(p)(2)(i)(A) through (C) are being 

finalized as proposed. Therefore, we are also 

finalizing confidentiality determinations of “not 

CBI” for the data elements in §98.236(o)(2)(i)(A) 

through (C).

§98.236(o)(2)(i)(B) Centrifugal compressor source (wet seal, isolation 

valve, or blowdown valve).

Facility and Unit 

Identifier Information

§98.236(o)(2)(i)(C) Unique name or ID for the leak or vent. Facility and Unit 

Identifier Information

34
Table 6. Data Elements Added to Tables 1 and 2 Since Proposal (continued)

Rule Citation Final Data Element Data Category Confidentiality Determination and Rationale

§98.236(o)(3)(i)(F) If the measurement is for a manifolded group of 

compressor sources, indicate whether the measurement 

location is prior to or after comingling with noncompressor emission sources.

Unit/ Process Static

Characteristics That are 

Not Inputs to Emission 

Equations

These data elements were added in the final 

amendments to harmonize reporting requirements 

with changes to the measurement requirements 

that were made after considering public comments 

on the proposal. These data elements were 

assigned to this data category because, like other 

elements in this data category, they do not vary 

with time or with operation of the compressor. 

Additionally, these data elements describe only an 

aspect of compressor design or emissions 

handling techniques that reveals no sensitive 

information that would be likely to cause 

substantial harm to any type of natural gas 

facility. Therefore, we conclude that it is 

appropriate to assign the data elements to this data 

category and finalize a determination of “not 

CBI” for these data elements.

§98.236(o)(4)(iii) Indicate whether the measured volume of flow during 

the reporting year includes compressor blowdown 

emissions as allowed for in §98.233(o)(3)(ii) and 

(o)(5)(iii).

Unit/ Process Static

Characteristics That are 

Not Inputs to Emission 

Equations

§98.236(o)(4)(iv) If the measurement is for a manifolded group of 

compressor sources, indicate whether the measurement 

location is prior to or after comingling with noncompressor emission sources.

Unit/ Process Static

Characteristics That are 

Not Inputs to Emission 

Equations

Reciprocating Compressors

§98.236(p)(1)(xii) For a reciprocating compressor with blind flanges, 

indicate the associated dates when it has blind flanges.

Unit/ Process Static 

Characteristics That are 

Not Inputs to Emission 

Equations

These data elements were added in the final 

amendments to harmonize reporting requirements 

with changes to the measurement requirements 

that were made after considering public comments 

on the proposal. These data elements were 

assigned to this data category because, like other 

elements in this data category, they do not vary 

with time or with operation of the compressor. 

Additionally, these data elements describe only an 

aspect of compressor design or emissions 

handling techniques that reveals no sensitive 

information that would be likely to cause 

substantial harm to any type of natural gas 

facility. Therefore, we conclude that it is 

appropriate to assign the data elements to this data 

category and finalize a determination of “not 

CBI” for these data elements.

§98.236(p)(3)(i)(F) If the measurement is for a manifolded group of 

compressor sources, indicate whether the measurement 

location is prior to or after comingling with noncompressor emission sources.

Unit/ Process Static 

Characteristics That are 

Not Inputs to Emission 

Equations

§98.236(p)(4)(iii) Indicate whether the measured volume of flow during 

the reporting year includes compressor blowdown 

emissions as allowed for in §98.233(p)(3)(ii) and 

(p)(5)(iii).

Unit/ Process Static 

Characteristics That are 

Not Inputs to Emission 

Equations

§98.236(p)(4)(iv) If the measurement is for a manifolded group of 

compressor sources, indicate whether the measurement 

location is prior to or after comingling with noncompressor emission sources.

Unit/ Process Static 

Characteristics That are 

Not Inputs to Emission 

Equations

35
Table 6. Data Elements Added to Tables 1 and 2 Since Proposal (continued)

Rule Citation Final Data Element Data Category Confidentiality Determination and Rationale

Equipment Leaks by Population Count

§98.236(r)(2)(v)(A) Annual CO2 emissions, in metric tons CO2, from above 

grade metering-regulating stations that are not above 

grade transmission-distribution transfer stations.

Emissions These data elements were inadvertently omitted 

from the discussion of confidentiality 

determinations in the preamble to the proposed 

amendments and supporting memoranda. The 

annual GHG emissions are assigned to the 

Emissions data category which has a categorical 

determination of “not CBI”. Thus, we are 

finalizing a confidentiality determination of “not 

CBI” for the data elements in §98.236(r)(2)(v)(A) 

and (r)(2)(v)(B).

§98.236(r)(2)(v)(B) Annual CH4 emissions, in metric tons CH4, from above 

grade metering regulating stations that are not above 

grade transmission-distribution transfer stations.

Emissions

36