1

MEMORANDUM

TO: Anne Pope/EPA

FROM: Darcy Wilson, Stacie Enoch and Robin Weyl/ERG

DATE: March 15, 2011

SUBJECT: Documentation for NEI Updates for Oil and Natural Gas Production and Natural 

Gas Transmission and Storage

1.0 INTRODUCTION

The purpose of this memorandum is to provide information on the Environmental Protection 

Agency (EPA) Risk and Technology Review (RTR) database used in estimating residual risk for 

the Oil and Natural Gas Production and Natural Gas Transmission and Storage Maximum 

Achievable Control Technology (MACT) source categories. These MACTs cover only major 

sources.

Section 112 of the Clean Air Act (CAA) establishes a two-stage regulatory process to address 

emissions of hazardous air pollutants (HAPs) from stationary sources. In the first stage, section 

112(d) requires the EPA to develop technology-based standards for categories of industrial 

sources. In the second stage, known as the residual risk stage, section 112(f)(2) requires EPA to 

assess the health and environmental risks that remain after sources come into compliance with 

MACT. If additional risk reductions are necessary to protect public health with an ample margin 

of safety or to prevent adverse environmental effects, EPA must develop standards to address 

these remaining risks. As part of this second stage, data were gathered to assess the residual risks 

from the Oil and Natural Gas Production and Natural Gas Transmission and Storage MACT 

source categories. 

The 2002 National Emissions Inventory (NEI) data served as the starting point for this 

assessment. Using the process MACT codes,

1

a subset of the NEI was developed that contained 

facility, process, and emissions data for each facility in the Oil and Natural Gas Production and 

Natural Gas Transmission and Storage source categories (MACT codes 0501 and 0504). The 

2002 NEI data for Oil and Natural Gas Production and Natural Gas Transmission and Storage

facilities were released through an Advanced Notice of Proposed Rulemaking (ANPR) in March 

of 2007, where NEI revisions for facilities in the MACT source categories were solicited from 

State and local agencies, industry representatives, and EPA. The revisions that were provided to 

EPA were incorporated into the 2005 NEI. 

 

1 Assigning data with MACT codes allows EPA to determine reductions attributable to the MACT program. The 

NEI associates MACT codes corresponding to MACT source categories with stationary major and area source data.
2

2.0 IDENTIFICATION OF FACILITIES AND PROCESS ASSIGNMENTS

In preparation for risk modeling, EPA reviewed the 2005 NEI to confirm that facilities in the Oil 

and Natural Gas Production and Natural Gas Transmission and Storage source categories were 

correctly assigned to the categories, and that all facilities thought to be included in the categories 

were correctly assigned. This review focused on the facility-level North American Industry 

Classification System (NAICS) and process-level Source Classification Codes (SCCs) in the 

2005 NEI.

Facilities with the NAICS codes shown in Table 1 were removed from the Oil and Natural Gas 

Production and Natural Gas Transmission and Storage datasets (and MACT codes 0501 and 

0504 were removed from these facilities in the overall NEI). Additionally, records with MACT 

0504 for facilities with NAICS codes 211111 or 221210 were reassigned to MACT 0501. 

Records with MACT 0501 for facilities with NAICS codes 48621 or 486210 were reassigned to 

MACT 0504.

At the process level, MACT code assignments were revised as shown in Appendix A. For the 

processes in the source categories, the Emission Process Groups shown in Appendix A were also 

assigned to aid in reviewing the risk assessment modeling results.

Revisions were also made for specific facilities. Three facilities (NEICA0291055, 

NEICO0450231 , and NEI5471) were removed from the datasets, because they do not have Oil 

and Natural Gas Production or Natural Gas Transmission and Storage operations. Two closed 

facilities (NEICA0834320 and NEICA0371291) were removed from the dataset. Formaldehyde 

emissions assigned to the category for one facility (NEIWY2612) were removed from the 

category. All records other than the ones assigned to emission unit 44 for one facility 

(NEI2CO045356) were removed from the data set. Four facilities (NEIIN0550027, 

NEIKS1590027, NEIKY1270024 and NEIWA0570002) were removed from the data sets, 

because these facilities did not have VOC emissions or emissions of the key HAPs shown in 

Table 2 assigned to MACT 0501 or 0504. 

Three additional facilities (NEI2ND291, NEIKS12970, and NEITX505004B) were removed 

from the MACT 0501 dataset, and four facilities (NEI21315, NEILA13662, NEILA2204100, 

and NEINE15738) were removed from the MACT 0504 dataset, because these facilities did not 

have VOC or HAP emissions assigned to MACT codes 0501 or 0504 after the revisions 

described above were completed.

As a result of these revisions, the Oil and Natural Gas Production dataset had 990 major 

facilities, and the Natural Gas Transmission and Storage dataset had 321 major facilities. 
3

Table 1. NAICS Codes Removed from Categories

NAICS Description

212312 Crushed and Broken Limestone Mining and Quarrying

213111 Drilling Oil and Gas Wells

213112 Support Activities for Oil and Gas Operations

221112 Fossil Fuel Electric Power Generation

221122 Electric Power Distribution

221320 Sewage Treatment Facilities

238910 Site Preparation Contractors

3* Manufacturing

42 Wholesale Trade

424710 Petroleum Bulk Stations and Terminals

424720

Petroleum and Petroleum Products Merchant Wholesalers (except Bulk Stations and 

Terminals)

45431 Fuel Dealers

454311 Heating Oil Dealers

454312 Liquefied Petroleum Gas (Bottled Gas) Dealers

484230 Specialized Freight (except Used Goods) Trucking, Long-Distance

486990 All Other Pipeline Transportation

48691* Pipeline Transportation of Refined Petroleum Products

4883* Support Activities for Water Transportation

493110 General Warehousing and Storage

493190 Other Warehousing and Storage

5* Information and Services

9* Public Administration
4

3.0 POLLUTANT ASSIGNMENTS

3.1 HAPs Emitted

For 983 of the 1,318 Oil and Natural Gas Production and Natural Gas Transmission and Storage 

facilities (75%), emission estimates for key HAPs were not available in the NEI. In order to 

model the most complete data set possible, EPA developed emission estimates for the missing 

HAPs shown in Table 2 based on the reported VOC emission estimates and the VOC percent 

ratios shown in Table 2. Surrogate emissions based on these ratios were assigned to 724 facilities

in the Oil and Natural Gas Production source category, and 259 facilities in the Natural Gas 

Transmission and Storage source category. Surrogate emissions for formaldehyde and 

acetaldehyde were not assigned to records with SCCs 31000205, 31000209, 31000227, 

31000228, 31000301, 31000302, or 31000304.

Table 2. Pollutants Added to Oil and Gas Production

and Natural Gas Transmission and Storage Facilities

Pollutant Ratio to VOC (%)

2,2,4-Trimethylpentane 0.016

Acetaldehyde 0.001

Benzene 1.548

Carbon Disulfide 0.008

Carbonyl Sulfide 0.043

Ethylbenzene 0.224

Ethylene Glycol 0.137

Formaldehyde 0.019

Hexane 2.384

Naphthalene 0.020

Toluene 2.225

Xylenes 1.219

3.2 HAPs Not Emitted

In contrast, some HAPs were included in the Oil and Natural Gas Production and Natural Gas 

Transmission and Storage datasets in error. Table 3 lists the HAPs (and in some cases the 

specific SCCs) where the MACT code assignments were removed from the 2005 NEI. A result 

of this step, one facility was removed from the Oil and Natural Gas Production dataset.

3.3 Chromium and Mercury Speciation

Consistent with the HAP list in the Clean Air Act, metals such as chromium and mercury may be 

represented in the NEI under different names, including chromium, chromium compounds, 

mercury, and mercury compounds. The speciation factors shown in Tables 4 and 5 were applied 
5

to the emissions of these metals for the SCCs listed. These and other chromium and mercury 

speciation profiles can be found on-line at: 

http://www.epa.gov/ttn/chief/net/2005inventory.html.

4.0 QA/QC

EPA conducted an extensive review of the locational coordinates for facilities in the Oil and 

Natural Gas Production and Natural Gas Transmission and Storage source categories. Locations 

were visually reviewed using Google Earth or ArcExplorer. For Oil and Natural Gas Production 

facilities, adjustments were made for 590 facilities (60%) based on these visual evaluations. For 

Natural Gas Transmission and Storage facilities, adjustments were made for 174 facilities (54%). 

After the initial coordinate revisions, EPA again reviewed locational coordinates and provided 

revised locational coordinates for 23 Oil and Natural Gas Production facilities and 15 Natural 

Gas Transmission and Storage facilities.

Table 3. Pollutants Removed from Oil and Gas Production and Natural Gas Transmission 

and Storage Facilities

Pollutant NEI Revision SCCs to Retain Pollutants

1,3-Butadiene Remove from both categories

Acetaldehyde Remove from both categories 

except for certain SCCs 

31000205, 31000227, 

31000301, 31000302

Acrolein Remove from both categories 

except for certain SCCs

31000205, 31000227

Cadmium Compounds Remove from both categories

Chlorine Remove from both categories

Chromium Compounds Remove from both categories

Cobalt Compounds Remove from both categories

Formaldehyde Remove from both categories 

except for certain SCCs

31000205, 31000209, 

31000227, 31000228, 

31000310, 31000302, 

31000304

Lead Compounds Remove from both categories

Manganese Compounds Remove from both categories

Nickel Compounds Remove from both categories

Selenium Compounds Remove from both categories

Tetrachloroethylene Remove from both categories
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Table 4. Whole Facility Chromium Speciation Factors Applied

SCC MACT 

Code

Pollutant 

Code

Pollutant 

Description HAP Category Name

% 

Hexavalent 

Chromium

Hexavalent 

Chromium 

Speciation 

Multiplier

%Trivalent 

Chromium

Trivalent 

Chromium 

Speciation 

Multiplier

20100102 0105-2 7440473 Chromium Chromium Compounds 18 0.18 82 0.82

20200102 0105-2 7440473 Chromium Chromium Compounds 18 0.18 82 0.82

20200401 0105-2 7440473 Chromium Chromium Compounds 18 0.18 82 0.82

20300101 0105-2 7440473 Chromium Chromium Compounds 18 0.18 82 0.82

10200601 0107-2 7440473 Chromium Chromium Compounds 4 0.04 96 0.96

10200602 0107-2 7440473 Chromium Chromium Compounds 4 0.04 96 0.96

10200603 0107-2 7440473 Chromium Chromium Compounds 4 0.04 96 0.96

10300602 0107-2 7440473 Chromium Chromium Compounds 4 0.04 96 0.96

10300603 0107-2 7440473 Chromium Chromium Compounds 4 0.04 96 0.96

10500106 0107-2 7440473 Chromium Chromium Compounds 4 0.04 96 0.96

10500206 0107-2 7440473 Chromium Chromium Compounds 4 0.04 96 0.96

20200201 0108-1 7440473 Chromium Chromium Compounds 4 0.04 96 0.96

20100101 0108-2 7440473 Chromium Chromium Compounds 18 0.18 82 0.82

20200101 0108-2 7440473 Chromium Chromium Compounds 18 0.18 82 0.82

27602011 NONE 7440473 Chromium Chromium Compounds 18 0.18 82 0.82
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Table 5. Whole Facility Mercury Speciation Factors Applied

SCC MACT 

Code

Pollutant 

Code

Pollutant 

Description

HAP 

Category 

Name

Particulate 

Divalent %

Gaseous 

Divalent 

%

Elemental 

Gaseous 

%

Particulate 

Divalent 

Speciation 

Factor

Gaseous 

Divalent 

Speciation 

Factor

Elemental 

Gaseous 

Speciation 

Factor

20400402 0101-1 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

20100102 0105-2 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

20200102 0105-2 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

20200401 0105-2 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

20300101 0105-2 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

20200401 0105-2 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

20200102 0105-2 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

20300101 0105-2 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

10200401 0107-3 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

10200403 0107-3 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

10300403 0107-3 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

31000401 0107-3 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5
8

Table 5. Whole Facility Mercury Speciation Factors Applied (Cont.)

SCC MACT 

Code

Pollutant 

Code

Pollutant 

Description

HAP 

Category 

Name

Particulate 

Divalent %

Gaseous 

Divalent 

%

Elemental 

Gaseous 

%

Particulate 

Divalent 

Speciation 

Factor

Gaseous 

Divalent 

Speciation 

Factor

Elemental 

Gaseous 

Speciation 

Factor

31000403 0107-3 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

31000412 0107-3 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

31000413 0107-3 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

31000413 0107-3 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

20100101 0108-2 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

20200101 0108-2 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5

39999999 NONE 7439976 Mercury Mercury 

Compounds

20 30 50 0.2 0.3 0.5
Appendix A

SCC Revisions and Emission Process Group Assignments
A-1

Table A-1. SCC Revisions and Emission Process Group Assignments

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0105-1 30600819 Petrol Indus /Fugitive Emissions /Compressor 

Seals: Gas Streams

Change from 0105-1 to 0501 Compressor Seals: Production

0105-1 31000107 Crude Oil Production /Oil/Gas/Water/Separation Change from 0105-1 to 0501 Separation

0105-1 31000124 Crude Oil Production /Valves: General Change from 0105-1 to 0501 Equipment leaks: Production

0105-1 31000127 Crude Oil Production /Flanges and Connections Change from 0105-1 to 0501 Equipment leaks: Production

0105-1 31000202 Natural Gas Production /Gas Stripping Operations Change from 0105-1 to 0501 Unknown

0105-1 31000203 Natural Gas Production /Compressors Change from 0105-1 to 0501 Compressor Seals: Production

0105-1 31000299 Natural Gas Production /Other Not Classified Change from 0105-1 to 0501 Oil and Gas Miscellaneous

0105-1 40300102 Petrol Prod Stor-Refinery /Tank Type Unknown 

/Crude

Change from 0105-1 to 0501 Condensate/crude oil tank

0105-1 40301010 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Crude Oil RVP 5: Breathing Loss (67000 Bbl 

Tank)

Change from 0105-1 to 0501 Condensate/crude oil tank

0105-1 40400302 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank: Working Loss

Change from 0105-1 to 0501 Condensate/crude oil tank

0105-1 40714697 Organic Chem Storage - Fixed Roof Tanks -

Specify In Comments: Breathing Loss

Change from 0105-1 to 0501 Condensate/crude oil tank

0107-2 30600812 Petrol Indus /Fugitive Emissions /Pipeline Valves: 

Light Liquid/Gas Streams

Change from 0107-2 to 0501 Pipeline Leaks: Other

0107-2 30603301 Petrol Indus /Desulfurization /Sulfur Recovery Unit Change from 0107-2 to 0501 Sulfur Recovery

0107-2 31000101 Crude Oil Production /Complete Well: Fugitive 

Emissions

Change from 0107-2 to 0501 Well Completions

0107-2 31000104 Crude Oil Production /Crude Oil Sumps Change from 0107-2 to 0501 Oil and Gas Miscellaneous

0107-2 31000205 Natural Gas Production /Flares Change from 0107-2 to 0501 Flares

0107-2 31000207 Natural Gas Production /Valves: Fugitive 

Emissions

Change from 0107-2 to 0501 Equipment leaks: Production

0107-2 31000225 Natural Gas Production /Compressor Seals Change from 0107-2 to 0501 Compressor Seals: Production

0107-2 31000299 Natural Gas Production /Other Not Classified Change from 0107-2 to 0501 Oil and Gas Miscellaneous

0107-2 40300102 Petrol Prod Stor-Refinery /Tank Type Unknown 

/Crude

Change from 0107-2 to 0501 Condensate/crude oil tank

0107-2 40714697 Organic Chem Storage - Fixed Roof Tanks -

Specify In Comments: Breathing Loss

Change from 0107-2 to 0501 Condensate/crude oil tank

0107-2 40729697 Organic Chem Storage - Floating Roof Tanks -

Specify In Comments: Breathing Loss

Change from 0107-2 to 0501 Condensate/crude oil tank
A-2

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0107-3 40301010 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Crude Oil RVP 5: Breathing Loss (67000 Bbl 

Tank)

change from 0107-3 to 0501 Condensate/crude oil tank

0501 20100102 Int Comb /Electric Gen /Distillate Oil (Diesel) 

/Reciprocating

Change from 0501 to 0105-2 no point assigned

0501 20100202 Int Comb /Electric Gen /Natural Gas /Reciprocating Change from 0501 to 0105-1 no point assigned

0501 20200102 Int Comb /Industrial /Distillate Oil (Diesel) 

/Reciprocating

Change from 0501 to 0105-2 no point assigned

0501 20200201 Int Comb /Industrial /Natural Gas /Turbine Change from 0501 to 0108-1 no point assigned

0501 20200202 Int Comb /Industrial /Natural Gas /Reciprocating Change from 0501 to 0105-1 no point assigned

0501 20200204 Int Comb /Industrial /Natural Gas /Reciprocating: 

Cogeneration

Change from 0501 to 0105-1 no point assigned

0501 20200252 Int Comb /Industrial /Natural Gas /2-cycle Lean 

Burn

Change from 0501 to 0105-1 no point assigned

0501 20200253 Int Comb /Industrial /Natural Gas /4-cycle Rich 

Burn

Change from 0501 to 0105-1 no point assigned

0501 20200254 Int Comb /Industrial /Natural Gas /4-cycle Lean 

Burn

Change from 0501 to 0105-1 no point assigned

0501 20200256 Int Comb /Industrial /Natural Gas /4-cycle Clean 

Burn

Change from 0501 to 0105-1 no point assigned

0501 20200301 Int Comb /Industrial /Gasoline /Reciprocating 

Engine

change from 0501 to 0105 no point assigned

0501 20200401 Int Comb /Industrial /Large Bore Engine /Diesel Change from 0501 to 0105-2 no point assigned

0501 28000211 Commercial Marine Vessels /Diesel /Crew Boats: 

Main Engine Exhaust: Idling

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 28000212 Commercial Marine Vessels /Diesel /Crew Boats: 

Main Engine Exhaust: Maneuvering

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 28000213 Commercial Marine Vessels /Diesel /Crew Boats: 

Auxiliary Generator Exhaust: Hotelling

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 28000216 Commercial Marine Vessels /Diesel /Supply Boats: 

Main Engine Exhaust: Idling

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 28000217 Commercial Marine Vessels /Diesel /Supply Boats: 

Main Engine Exhaust: Maneuvering

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 28000218 Commercial Marine Vessels /Diesel /Supply Boats: 

Auxiliary Generator Exhaust: Hotelling

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned
A-3

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0501 30102321 Chem Manuf /Sulfuric Acid (Contact Process) 

/Storage Tank Vent

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 30103201 Chem Manuf /Elemental Sulfur Production /Mod. 

Claus: 2 Stage w/o Control (92-95% Removal)

No change required Sulfur Recovery

0501 30103203 Chem Manuf /Elemental Sulfur Production /Mod. 

Claus: 4 Stage w/o Control (96-97% Removal)

No change required Sulfur Recovery

0501 30103204 Chem Manuf /Elemental Sulfur Production /Sulfur 

Removal Process (99.9% Removal)

No change required Sulfur Recovery

0501 30107002 Chem Manuf /Inorganic Chem Manuf 

/Storage/Transfer

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 30180010 Chem Manuf /General Processes /Compressor 

Seals: Gas Stream

No change required Compressor Seals: Production

0501 30188599 Chem Manuf /Inorganic Chem Stor (Pressure 

Tanks) /Specify Gas: Withdrawal Loss

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 30188801 Chem Manuf /Fugitive Emissions /Specify in 

Comments Field

No change required Fugitives: Other

0501 30190023 Chem Manuf /Fuel Fired Equipment /Natural Gas: 

Flares

No change required Flares

0501 30199999 Chem Manuf /Other Not Classified /Specify in 

Comments Field

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 30201949 Vegetable Oil Processing /Crude Oil Storage Tanks No change required Condensate/crude oil tank

0501 30510298 Mineral Prods /Bulk Materials Storage Bins 

/Mineral: Specify in Comments

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 30600104 Petrol Indus /Process Heaters /Gas-fired No change required Process Heaters

0501 30600402 Petrol Indus /Blowdown Systems /Blowdown 

System w/o Controls

No change required Pipeline Blowdowns/Maintenance

0501 30600503 Petrol Indus /Wastewater Treatment /Process 

Drains and Wastewater Separators

No change required Wastewater treatment

0501 30600504 Petrol Indus /Wastewater Treatment /Process 

Drains and Wastewater Separators

No change required Wastewater treatment

0501 30600508 Petrol Indus /Wastewater Treatment /Oil/Water 

Separator

No change required Separation

0501 30600602 Petrol Indus /Vacuum Distillate Column 

Condensors /Vacuum Distillation Column 

Condenser

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned
A-4

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0501 30600701 Petrol Indus /Cooling Towers /Cooling Towers Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 30600801 Petrol Indus /Fugitive Emissions /Pipeline Valves 

and Flanges

No change required Pipeline Leaks: Other

0501 30600802 Petrol Indus /Fugitive Emissions /Vessel Relief 

Valves

No change required Equipment Leaks: other

0501 30600803 Petrol Indus /Fugitive Emissions /Pump Seals w/o 

Controls

No change required Equipment Leaks: other

0501 30600804 Petrol Indus /Fugitive Emissions /Compressor Seals No change required Compressor seals: other

0501 30600805 Petrol Indus /Fugitive Emissions /Miscellaneous: 

Sampling/Non-Asphalt Blowing/Purging/etc.

No change required Fugitives: Other

0501 30600806 Petrol Indus /Fugitive Emissions /Pump Seals with 

Controls

No change required Equipment Leaks: other

0501 30600811 Petrol Indus /Fugitive Emissions /Pipeline Valves: 

Gas Streams

No change required Pipeline Leaks: Other

0501 30600812 Petrol Indus /Fugitive Emissions /Pipeline Valves: 

Light Liquid/Gas Streams

No change required Pipeline Leaks: Other

0501 30600813 Petrol Indus /Fugitive Emissions /Pipeline Valves: 

Heavy Liquid Streams

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 30600814 Petrol Indus /Fugitive Emissions /Pipeline Valves: 

Hydrogen Streams

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 30600815 Petrol Indus /Fugitive Emissions /Open-ended 

Valves: All Streams

No change required Equipment Leaks: other

0501 30600816 Petrol Indus /Fugitive Emissions /Flanges: All 

Streams

No change required Equipment Leaks: other

0501 30600817 Petrol Indus /Fugitive Emissions /Pump Seals: 

Light Liquid/Gas Streams

No change required Equipment Leaks: other

0501 30600818 Petrol Indus /Fugitive Emissions /Pump Seals: 

Heavy Liquid Streams

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 30600819 Petrol Indus /Fugitive Emissions /Compressor 

Seals: Gas Streams

No change required Compressor seals: other

0501 30600820 Petrol Indus /Fugitive Emissions /Compressor 

Seals: Heavy Liquid Streams

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 30600821 Petrol Indus /Fugitive Emissions /Drains: All 

Streams

No change required Fugitives: Other
A-5

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0501 30600822 Petrol Indus /Fugitive Emissions /Vessel Relief 

Valves: All Streams

No change required Equipment Leaks: other

0501 30600903 Petrol Indus /Flares /Natural Gas No change required Flares

0501 30600904 Petrol Indus /Flares /Process Gas No change required Flares

0501 30602401 Int Comb /Industrial /Natural Gas /Reciprocating change from 0501 to 105-1 no point assigned

0501 30622001 Petrol Indus /Underground Storage Remediation &

Other Remediation /Soil

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 30688801 Petrol Indus /Fugitive Emissions /Specify in 

Comments Field

No change required Fugitives: Other

0501 30900201 Fabricated Metal /Abrasive Blasting of Metal Parts 

/General

Change from 0501 to 1664 no point assigned

0501 30990001 Fabricated Metal /Fuel Fired Equipment /Distillate 

Oil (No. 2): Process Heaters

No change required Process Heaters

0501 31000101 Crude Oil Production /Complete Well: Fugitive 

Emissions

No change required Well Completions

0501 31000102 Crude Oil Production /Miscellaneous Well: General No change required Wells: Other

0501 31000103 Crude Oil Production /Wells: Rod Pumps No change required Wells: Other

0501 31000104 Crude Oil Production /Crude Oil Sumps No change required Oil and Gas Miscellaneous

0501 31000105 Crude Oil Production /Crude Oil Pits No change required Oil and Gas Miscellaneous

0501 31000107 Crude Oil Production /Oil/Gas/Water/Separation No change required Separation

0501 31000108 Crude Oil Production /Evaporation from Liquid 

Leaks into Oil Well Cellars

No change required Equipment leaks: Production

0501 31000123 Crude Oil Production /Well Casing Vents No change required Wells: Other

0501 31000124 Crude Oil Production /Valves: General No change required Equipment leaks: Production

0501 31000125 Crude Oil Production /Relief Valves No change required Equipment leaks: Production

0501 31000126 Crude Oil Production /Pump Seals No change required Equipment leaks: Production

0501 31000127 Crude Oil Production /Flanges and Connections No change required Equipment leaks: Production

0501 31000130 Crude Oil Production /Fugitives: Compressor Seals No change required Compressor Seals: Production

0501 31000131 Crude Oil Production /Fugitives: Drains No change required Fugitives: Other

0501 31000132 Crude Oil Production /Atmospheric Wash Tank 

(2nd Stage of Gas-Oil Separation): Flashing Loss

No change required Separation

0501 31000160 Crude Oil Production /Flares No change required Flares

0501 31000199 Crude Oil Production /Processing Operations: Not 

Classified

No change required Oil and Gas Miscellaneous
A-6

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0501 31000201 Natural Gas Production /Gas Sweetening: Amine 

Process

No change required Amine Treaters

0501 31000202 Natural Gas Production /Gas Stripping Operations No change required Amine Treaters

0501 31000203 Natural Gas Production /Compressors No change required Compressor Leaks: Other

0501 31000204 Natural Gas Production /Wells No change required Wells: Other

0501 31000205 Natural Gas Production /Flares No change required Flares

0501 31000207 Natural Gas Production /Valves: Fugitive 

Emissions

No change required Equipment leaks: Production

0501 31000209 Natural Gas Production /Incinerators Burning 

Waste Gas or Augmented Waste Gas

No change required Incinerators

0501 31000215 Natural Gas Production /Flares Combusting Gases 

:1000 BTU/scf

No change required Flares

0501 31000220 Natural Gas Production /All Equipt Leak Fugitives 

(Valves, Flanges, Connections, Seals, Drains

No change required Equipment leaks: Production

0501 31000223 Natural Gas Production /Relief Valves No change required Equipment leaks: Production

0501 31000224 Natural Gas Production /Pump Seals No change required Equipment leaks: Production

0501 31000225 Natural Gas Production /Compressor Seals No change required Compressor Seals: Production

0501 31000226 Natural Gas Production /Flanges and Connections No change required Equipment leaks: Production

0501 31000227 Natural Gas Production /Glycol Dehydrator 

Reboiler Still Stack

No change required Dehydrators

0501 31000228 Natural Gas Production /Glycol Dehydrator 

Reboiler Burner

No change required Dehydrators

0501 31000230 Natural Gas Production /Hydrocarbon Skimmer No change required Oil and Gas Miscellaneous

0501 31000299 Natural Gas Production /Other Not Classified No change required Oil and Gas Miscellaneous

0501 31000301 Natural Gas Proc Facilities /Glycol Dehydrators: 

Reboiler Still Vent: Triethylene Glycol

No change required Dehydrators

0501 31000302 Natural Gas Proc Facilities /Glycol Dehydrators: 

Reboiler Burner Stack: Triethylene Glycol

No change required Dehydrators

0501 31000304 Natural Gas Proc Facilities /Glycol Dehydrators: 

Ethylene Glycol: General

No change required Dehydrators

0501 31000305 Natural Gas Proc Facilities /Gas Sweeting: Amine 

Process

No change required Amine Treaters

0501 31000306 Natural Gas Proc Facilities /Process Valves No change required Equipment leaks: Processing

0501 31000308 Natural Gas Proc Facilities /Open-ended Lines No change required Equipment leaks: Processing

0501 31000309 Natural Gas Proc Facilities /Compressor Seals No change required Compressor Seals: Processing
A-7

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0501 31000311 Natural Gas Proc Facilities /Flanges and 

Connections

No change required Equipment leaks: Processing

0501 31000321 Natural Gas Proc Facilities /Glycol Dehydrators: 

Niagaran Formation (Mich.)

No change required Dehydrators

0501 31000323 Natural Gas Proc Facilities /Glycol Dehydrators: 

Antrim Formation (Mich.)

No change required Dehydrators

0501 31000404 Oil&Gas Prod /Process Heaters /Natural Gas No change required Process Heaters

0501 31000502 Oil&Gas Prod /Liquid Waste Treatment /Liquid -

Liquid Separator

No change required Separation

0501 31000503 Oil&Gas Prod /Liquid Waste Treatment /Oil-Water 

Separator

No change required Separation

0501 31000506 Oil&Gas Prod /Liquid Waste Treatment /Oil-Water 

Separation Wastewater Holding Tanks

No change required Separation

0501 31088801 Oil&Gas Prod /Fugitive Emissions /Specify in 

Comments Field

No change required Fugitives: Other

0501 31088802 Oil&Gas Prod /Fugitive Emissions /Specify in 

Comments Field

No change required Fugitives: Other

0501 31088803 Oil&Gas Prod /Fugitive Emissions /Specify in 

Comments Field

No change required Fugitives: Other

0501 31088804 Oil&Gas Prod /Fugitive Emissions /Specify in 

Comments Field

No change required Fugitives: Other

0501 31088805 Oil&Gas Prod /Fugitive Emissions /Specify in 

Comments Field

No change required Fugitives: Other

0501 31088811 Oil&Gas Prod /Fugitive Emissions /Fugitive 

Emissions

No change required Fugitives: Other

0501 33088801 Textiles /Fugitive Emissions /Specify in Comments 

Field

No change required Fugitives: Other

0501 38500101 Industrial Process Cooling Tower /Mechanical 

Draft

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 39000699 In-Process Fuel Use /Natural Gas /General No change required Process Heaters

0501 39000799 In-Process Fuel Use /Process Gas /General No change required Process Heaters

0501 39001099 In-Process Fuel Use /Liquified Petroleum Gas 

/General

No change required Process Heaters

0501 39090003 Fuel Storage - Fixed Roof Tanks /Distillate Oil 

(No. 2): Breathing Loss

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned
A-8

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0501 39090004 Fuel Storage - Fixed Roof Tanks /Distillate Oil 

(No. 2): Working Loss

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 39090006 Fuel Storage - Fixed Roof Tanks /Oil No. 6: 

Working Loss

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 39990013 Misc Manuf Indus /Natural Gas: Incinerators No change required Incinerators

0501 39990014 Misc Manuf Indus /Process Gas: Incinerators No change required Incinerators

0501 39990023 Misc Manuf Indus /Natural Gas: Flares No change required Flares

0501 39999989 Misc Manuf / Indus Processes /Other Not Classified Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 39999992 Misc Manuf / Indus Processes /Other Not Classified Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 39999999 Misc Manuf / Indus Processes /Other Not Classified Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40100296 Degreasing : Other Not Classified: General 

Degreasing Units

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40100302 Solvent Evap /Cold Solvent Cleaning/Stripping 

/Methylene Chloride

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40100303 Solvent Evap /Cold Solvent Cleaning/Stripping 

/Stoddard (Petroleum Solvent)

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40100304 Solvent Evap /Cold Solvent Cleaning/Stripping 

/Perchloroethylene

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40100398 Solvent Evap /Cold Solvent Cleaning/Stripping 

/Other Not Classified

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40100399 Solvent Evap /Cold Solvent Cleaning/Stripping 

/Other Not Classified

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40188801 Solvent Evap /Fugitive Emissions /Specify in 

Comments Field

No change required Fugitives: Other

0501 40188898 Solvent Evap /Fugitive Emissions /Specify in 

Comments Field

No change required Fugitives: Other

0501 40200101 Surface Coating Application - General /Paint: 

Solvent-base

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40200110 Surface Coating Application - General /Paint: 

Solvent-base

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40200501 Surface Coating Application - General /Enamel Not in 0501 reassign to new MACT 

code as appropriate

no point assigned
A-9

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0501 40200901 Surface Coating /Thinning Solvents - General 

/General: Specify in Comments

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40200920 Surface Coating /Thinning Solvents - General 

/Mineral Spirits

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40200998 Surface Coating /Thinning Solvents - General 

/General: Specify in Comments

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40202501 Surface Coating /Misc Metal Parts /Coating 

Operation

Change from 0501 to 0710 no point assigned

0501 40202599 Surface Coating /Misc Metal Parts /Other Not 

Classified

Change from 0501 to 0710 no point assigned

0501 40299998 Surface Coating /Miscellaneous /Specify in 

Comments Field

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40300101 Petrol Prod Stor-Refinery /Tank Type Unknown 

/Gasoline

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40300102 Petrol Prod Stor-Refinery /Tank Type Unknown 

/Crude

No change required Condensate/crude oil tank

0501 40300103 Petrol Prod Stor-Refinery /Tank Type Unknown 

/Gasoline

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40300104 Petrol Prod Stor-Refinery /Tank Type Unknown 

/Crude

No change required Condensate/crude oil tank

0501 40300107 Petrol Prod Stor-Refinery /Tank Type Unknown 

/Dist Fuel

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40300152 Petrol Prod Stor-Refinery /Tank Type Unknown 

/Dist Fuel

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40300198 Petrol Prod Stor-Refinery /Tank Type Unknown 

/See Comment

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40300199 Petrol Prod Stor-Refinery /Tank Type Unknown 

/See Comment

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40301002 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Gasoline RVP 10: Breathing Loss (67000 Bbl 

Tank)

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40301008 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Gasoline RVP 10: Working Loss

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40301009 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Gasoline RVP 7: Working Loss

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned
A-10

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0501 40301010 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Crude Oil RVP 5: Breathing Loss (67000 Bbl 

Tank)

No change required Condensate/crude oil tank

0501 40301011 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Crude Oil RVP 5: Breathing Loss (250000 Bbl 

Tank)

No change required Condensate/crude oil tank

0501 40301012 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Crude Oil RVP 5: Working Loss

No change required Condensate/crude oil tank

0501 40301019 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Distillate Fuel #2: Breathing Loss (67000 Bbl 

Tank)

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40301021 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Distillate Fuel #2: Working Loss

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40301097 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Specify Liquid: Breathing Loss (67000 Bbl Tank)

No change required Condensate/crude oil tank

0501 40301099 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Specify Liquid: Working Loss

No change required Condensate/crude oil tank

0501 40301101 Petrol Prod Stor-Refinery /Floating Roof Tanks 

/Gasoline RVP 13: Standing Loss (67000 Bbl 

Tank)

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40301110 Petrol Prod Stor-Refinery /Floating Roof Tanks 

/Crude Oil RVP 5: Standing Loss (250000 Bbl 

Tank)

No change required Condensate/crude oil tank

0501 40301117 Petrol Prod Stor-Refinery /Floating Roof Tanks 

/Crude Oil RVP 5: Withdrawal Loss

No change required Condensate/crude oil tank

0501 40301132 Petrol Prod Stor-Refinery /Floating Roof Tanks 

/Crude Oil: Standing Loss - External - Primary Seal

No change required Condensate/crude oil tank

0501 40301142 Petrol Prod Stor-Refinery /Floating Roof Tanks 

/Crude Oil: Standing Loss - External - Secondary 

Seal

No change required Condensate/crude oil tank

0501 40301152 Petrol Prod Stor-Refinery /Floating Roof Tanks 

/Crude Oil: Standing Loss - Internal

No change required Condensate/crude oil tank

0501 40301198 Petrol Prod Stor-Refinery /Floating Roof Tanks 

/Specify Liquid: Standing Loss (67000 Bbl Tank)

No change required Condensate/crude oil tank

0501 40388801 Petrol Prod Stor-Refinery /Fugitive Emissions 

/Specify in Comments Field

No change required Fugitives: Other
A-11

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0501 40399999 Petrol Prod Stor-Refinery /Other Not Classified 

/See Comment **

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40400108 Petrol Prod Stor-Bulk Terminals /Gasoline RVP 10: 

Working Loss (Diam Independent) - Fixed Roof 

Tank

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40400250 Petrol Prod Stor-Bulk Plants /Loading Racks No change required Truck/Railcar Unloading

0501 40400301 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank: Breathing Loss

No change required Condensate/crude oil tank

0501 40400302 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank: Working Loss

No change required Condensate/crude oil tank

0501 40400303 Oil&Gas Field Stor&Workg Tanks /External 

Floating Roof Tank with Primary Seals: Standing 

Loss

No change required Condensate/crude oil tank

0501 40400304 Oil&Gas Field Stor&Workg Tanks /External 

Floating Roof Tank with Secondary Seals: Standing 

Loss

No change required Condensate/crude oil tank

0501 40400305 Oil&Gas Field Stor&Workg Tanks /Internal 

Floating Roof Tank: Standing Loss

No change required Condensate/crude oil tank

0501 40400306 Oil&Gas Field Stor&Workg Tanks /External 

Floating Roof Tank: Withdrawal Loss

No change required Condensate/crude oil tank

0501 40400307 Oil&Gas Field Stor&Workg Tanks /Internal 

Floating Roof Tank: Withdrawal Loss

No change required Condensate/crude oil tank

0501 40400311 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank, Condensate, working+breathing+flashing 

losses

No change required Condensate/crude oil tank

0501 40400312 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank, Crude Oil, working+breathing+flashing 

losses

No change required Condensate/crude oil tank

0501 40400314 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank, Specialty Chem-working+breathing+flashing

No change required Condensate/crude oil tank

0501 40400315 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank, Produced Water, 

working+breathing+flashing

No change required Produced Water Tanks

0501 40400321 Oil&Gas Field Stor&Workg Tanks /External 

Floating Roof Tank, Condensate, 

working+breathing+flashing

No change required Condensate/crude oil tank
A-12

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0501 40400322 Oil&Gas Field Stor&Workg Tanks /External 

Floating Roof Tank, Crude Oil, 

working+breathing+flashing

No change required Condensate/crude oil tank

0501 40400414 Petrol Prod Stor-Underground Tanks /Distillate 

Fuel #2: Working Loss

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40600132 Petrol Trans & Marketg /Tank Cars & Trucks 

/Crude Oil: Submerged Loading (Normal Service)

No change required Truck/Railcar Unloading

0501 40600134 Petrol Trans & Marketg /Tank Cars & Trucks 

/Kerosene: Submerged Loading (Normal Services)

Not in 0501 reassign to new MACT

code as appropriate

no point assigned

0501 40600135 Petrol Trans & Marketg /Tank Cars & Trucks 

/Distillate Oil: Submerged Loading (Normal 

Service)

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40600136 Petrol Trans & Marketg /Tank Cars & Trucks 

/Gasoline: Splash Loading (Normal Service)

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40600137 Petrol Trans & Marketg /Tank Cars & Trucks 

/Crude Oil: Splash Loading (Normal Service)

No change required Truck/Railcar Unloading

0501 40600139 Petrol Trans & Marketg /Tank Cars & Trucks 

/Kerosene: Splash Loading (Normal Service)

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40600140 Petrol Trans & Marketg /Tank Cars & Trucks 

/Distillate Oil: Splash Loading (Normal Service)

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40600141 Petrol Trans & Marketg /Tank Cars & Trucks 

/Gasoline: Submerged Loading (Balanced Service)

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40600142 Petrol Trans & Marketg /Tank Cars & Trucks 

/Crude Oil: Submerged Loading (Balanced Service)

No change required Truck/Railcar Unloading

0501 40600144 Petrol Trans & Marketg /Tank Cars & Trucks 

/Gasoline: Splash Loading (Balanced Service)

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40600145 Petrol Trans & Marketg /Tank Cars & Trucks 

/Crude Oil: Splash Loading (Balanced Service)

No change required Truck/Railcar Unloading

0501 40600148 Petrol Trans & Marketg /Tank Cars & Trucks 

/Crude Oil: Submerged Loading (Clean Tanks)

No change required Truck/Railcar Unloading

0501 40600161 Petrol Trans & Marketg /Tank Cars & Trucks 

/Distillate Oil: Submerged Loading (Clean Tanks)

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40600162 Petrol Trans & Marketg /Tank Cars & Trucks 

/Gasoline: Loaded with Fuel (Transit Losses)

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned
A-13

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0501 40600164 Petrol Trans & Marketg /Tank Cars & Trucks 

/Crude Oil: Loaded with Product

No change required Truck/Railcar Unloading

0501 40600170 Petrol Trans & Marketg /Tank Cars & Trucks 

/Distillate Oil: Loaded with Product

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40600199 Petrol Trans & Marketg /Tank Cars & Trucks /Not 

Classified **

No change required Truck/Railcar Unloading

0501 40600403 Petrol Trans & Marketg /Filling Vehicle Gas Tanks 

- Stage II /Vapor Loss w/o Controls

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40688802 Petrol Trans & Marketg /Fugitive Emissions 

/Specify in Comments Field

No change required Fugitives: Other

0501 40700815 Organic Chem Storage - Fixed Roof Tanks -

Methyl Alcohol: Breathing Loss

No change required Storage tanks: methanol

0501 40700816 Organic Chem Storage - Fixed Roof Tanks -

Methyl Alcohol: Working Loss

No change required Storage tanks: methanol

0501 40701611 Organic Chem Storage - Fixed Roof Tanks -

Naphtha: Breathing Loss

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40701612 Organic Chem Storage - Fixed Roof Tanks -

Naphtha: Working Loss

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40703623 Organic Chem Storage - Fixed Roof Tanks -

Xylenes, Mixed: Breathing Loss

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40703624 Organic Chem Storage - Fixed Roof Tanks -

Xylenes, Mixed: Working Loss

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40703625 Organic Chem Storage - Fixed Roof Tanks -

Creosote: Breathing Loss

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40703626 Organic Chem Storage - Fixed Roof Tanks -

Creosote: Working Loss

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40703698 Organic Chem Storage - Fixed Roof Tanks -

Specify Aromatic: Working Loss

Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0501 40705603 Organic Chem Storage - Fixed Roof Tanks -

Ethylene Glycol: Breathing Loss

No change required Storage tanks: glycol

0501 40705698 Organic Chem Storage - Fixed Roof Tanks -

Specify Glycol: Working Loss

No change required Storage tanks: glycol

0501 40714697 Organic Chem Storage - Fixed Roof Tanks -

Specify In Comments: Breathing Loss

No change required Condensate/crude oil tank
A-14

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0501 40799998 Organic Chem Storage - Miscellaneous /Specify in 

Comments

No change required Condensate/crude oil tank

0501 40799999 Organic Chem Storage - Miscellaneous /Other Not 

Classified

No change required Condensate/crude oil tank

0501 40899995 Organic Chem Transport /Specific Liquid 

/Cars/Trucks: Loading Rack

No change required Truck/Railcar Unloading

0501 40899999 Organic Chem Transport /Specific Liquid /Loading 

Rack

No change required Truck/Railcar Unloading

0501 50300901 Waste Disp-Indus /Asbestos Removal /General Not in 0501 reassign to new MACT 

code as appropriate

no point assigned

0503 30600816 Petrol Indus /Fugitive Emissions /Flanges: All 

Streams

Change from 0503 to 0501 Equipment Leaks: other

0503 30600822 Petrol Indus /Fugitive Emissions /Vessel Relief 

Valves: All Streams

Change from 0503 to 0501 Equipment Leaks: other

0503 40300104 Petrol Prod Stor-Refinery /Tank Type Unknown 

/Crude

Change from 0503 to 0501 Condensate/crude oil tank

0503 40301010 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Crude Oil RVP 5: Breathing Loss (67000 Bbl 

Tank)

Change from 0503 to 0501 Condensate/crude oil tank

0503 40301012 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Crude Oil RVP 5: Working Loss

Change from 0503 to 0501 Condensate/crude oil tank

0503 40600135 Petrol Trans & Marketg /Tank Cars & Trucks 

/Distillate Oil: Submerged Loading (Normal 

Service)

Change from 0503 to 0501 Truck/Railcar Unloading

0503 40600142 Petrol Trans & Marketg /Tank Cars & Trucks 

/Crude Oil: Submerged Loading (Balanced Service)

Change from 0503 to 0501 Truck/Railcar Unloading

0504 10100602 Ext Comb /Electric Gen /Natural Gas /Boilers < 

100 Million Btu/hr except Tangential

No change required no point assigned

0504 10200603 Ext Comb /Industrial /Natural Gas /< 10 Million 

Btu/hr

No change required no point assigned

0504 20100202 Int Comb /Electric Gen /Natural Gas /Reciprocating Change from 0504 to 0105-1 no point assigned

0504 20200202 Int Comb /Industrial /Natural Gas /Reciprocating Change from 0504 to 0105-1 no point assigned

0504 20200252 Int Comb /Industrial /Natural Gas /2-cycle Lean 

Burn

Change from 0504 to 0105-1 no point assigned
A-15

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0504 20200253 Int Comb /Industrial /Natural Gas /4-cycle Rich 

Burn

Change from 0504 to 0105-1 no point assigned

0504 20200254 Int Comb /Industrial /Natural Gas /4-cycle Lean 

Burn

Change from 0504 to 0105-1 no point assigned

0504 20200301 Int Comb /Industrial /Gasoline /Reciprocating 

Engine

Change from 0504 to 0105 no point assigned

0504 20201001 Int Comb /Industrial /Liquified Petroleum Gas 

/Propane: Reciprocating

Change from 0504 to 0105 no point assigned

0504 20300101 Int Comb /Comm-Inst /Distillate Oil (Diesel) 

/Reciprocating

Change from 0504 to 0105-2 no point assigned

0504 20300201 Int Comb /Comm-Inst /Natural Gas /Reciprocating Change from 0504 to 0105-1 no point assigned

0504 20300301 Int Comb /Comm-Inst /Gasoline /Reciprocating Change from 0504 to 0105-1 no point assigned

0504 20301001 Int Comb /Comm-Inst /Liquified Petroleum Gas 

/Propane: Reciprocating

Change from 0504 to 0105-1 no point assigned

0504 28888801 Int Comb /Fugitive Emissions /Other Not Classified 

/Specify in Comments

No change required Fugitives: Other

0504 30600402 Petrol Indus /Blowdown Systems /Blowdown 

System w/o Controls

Change from 0504 to 0501 Pipeline Blowdowns/Maintenance

0504 30600503 Petrol Indus /Wastewater Treatment /Process 

Drains and Wastewater Separators

Change from 0504 to 0501 Wastewater treatment

0504 30600801 Petrol Indus /Fugitive Emissions /Pipeline Valves 

and Flanges

Change from 0504 to 0501 Pipeline Leaks: Other

0504 30600803 Petrol Indus /Fugitive Emissions /Pump Seals w/o 

Controls

Change from 0504 to 0501 Equipment Leaks: other

0504 30600805 Petrol Indus /Fugitive Emissions /Miscellaneous: 

Sampling/Non-Asphalt Blowing/Purging/etc.

No change required Fugitives: Other

0504 30600811 Petrol Indus /Fugitive Emissions /Pipeline Valves: 

Gas Streams

Change from 0504 to 0501 Pipeline Leaks: Other

0504 30600813 Petrol Indus /Fugitive Emissions /Pipeline Valves: 

Heavy Liquid Streams

No change required Fugitives: Other

0504 30600816 Petrol Indus /Fugitive Emissions /Flanges: All 

Streams

Change from 0504 to 0501 Equipment Leaks: other

0504 30600819 Petrol Indus /Fugitive Emissions /Compressor 

Seals: Gas Streams

Change from 0504 to 0501 Compressor seals: other
A-16

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0504 30600822 Petrol Indus /Fugitive Emissions /Vessel Relief 

Valves: All Streams

Change from 0504 to 0501 Equipment Leaks: other

0504 30600904 Petrol Indus /Flares /Process Gas Change from 0504 to 0501 Flares

0504 30900201 Fabricated Metal /Abrasive Blasting of Metal Parts 

/General

Change from 0504 to NONE no point assigned

0504 31000101 Crude Oil Production /Complete Well: Fugitive 

Emissions

Change from 0504 to 0501 Well Completions

0504 31000104 Crude Oil Production /Crude Oil Sumps Change from 0504 to 0501 Oil and Gas Miscellaneous

0504 31000202 Natural Gas Production /Gas Stripping Operations Change from 0504 to 0501 Unknown

0504 31000207 Natural Gas Production /Valves: Fugitive 

Emissions

Change from 0504 to 0501 Equipment leaks: Production

0504 31000211 Natural Gas Production /Pipeline Pigging (releases 

during pig removal)

Change from 0504 to 0501 Pipeline Blowdowns/Maintenance

0504 31000223 Natural Gas Production /Relief Valves Change from 0504 to 0501 Equipment leaks: Production

0504 31000224 Natural Gas Production /Pump Seals Change from 0504 to 0501 Equipment leaks: Production

0504 31000225 Natural Gas Production /Compressor Seals Change from 0504 to 0501 Compressor Seals: Production

0504 31000227 Natural Gas Production /Glycol Dehydrator 

Reboiler Still Stack

Change from 0504 to 0501 Dehydrators

0504 31000299 Natural Gas Production /Other Not Classified Change from 0504 to 0501 Oil and Gas Miscellaneous

0504 31000301 Natural Gas Proc Facilities /Glycol Dehydrators: 

Reboiler Still Vent: Triethylene Glycol

Change from 0504 to 0501 Dehydrators

0504 31088801 Oil&Gas Prod /Fugitive Emissions /Specify in 

Comments Field

Change from 0504 to 0501 Fugitives: Production

0504 31480001 Transport Equipt /Equipment Leaks /Equipment 

Leaks

No change required Other

0504 39000699 In-Process Fuel Use /Natural Gas /General No change required Other

0504 39090011 Fuel Storage - Fixed Roof Tanks /Dual Fuel 

(Gas/Oil): Breathing Loss

No change required Other

0504 39990003 Misc Manuf Indus /Natural Gas: Process Heaters No change required Other

0504 39990013 Misc Manuf Indus /Natural Gas: Incinerators No change required Other

0504 39990023 Misc Manuf Indus /Natural Gas: Flares No change required Flares

0504 39999999 Misc Manuf / Indus Processes /Other Not Classified No change required Oil and Gas Miscellaneous

0504 40100251 Degreasing : Stoddard (Petroleum Solvent): 

General Degreasing Units

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned
A-17

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0504 40100296 Degreasing : Other Not Classified: General 

Degreasing Units

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40100398 Solvent Evap /Cold Solvent Cleaning/Stripping 

/Other Not Classified

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40200101 Surface Coating Application - General /Paint: 

Solvent-base

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40200901 Surface Coating /Thinning Solvents - General 

/General: Specify in Comments

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40202501 Surface Coating /Misc Metal Parts /Coating 

Operation

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40299998 Surface Coating /Miscellaneous /Specify in 

Comments Field

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40300198 Petrol Prod Stor-Refinery /Tank Type Unknown 

/See Comment

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40300199 Petrol Prod Stor-Refinery /Tank Type Unknown 

/See Comment

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40301002 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Gasoline RVP 10: Breathing Loss (67000 Bbl 

Tank)

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40301007 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Gasoline RVP 13: Working Loss

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40301008 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Gasoline RVP 10: Working Loss

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40301010 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Crude Oil RVP 5: Breathing Loss (67000 Bbl 

Tank)

Change from 0504 to 0501 Condensate/crude oil tank

0504 40301011 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Crude Oil RVP 5: Breathing Loss (250000 Bbl 

Tank)

Change from 0504 to 0501 Condensate/crude oil tank

0504 40301012 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Crude Oil RVP 5: Working Loss

Change from 0504 to 0501 Condensate/crude oil tank

0504 40301019 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Distillate Fuel #2: Breathing Loss (67000 Bbl 

Tank)

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned
A-18

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0504 40301021 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Distillate Fuel #2: Working Loss

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40301097 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Specify Liquid: Breathing Loss (67000 Bbl Tank)

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40301098 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Specify Liquid: Breathing Loss (250000 Bbl Tank)

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40301099 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Specify Liquid: Working Loss

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40301115 Petrol Prod Stor-Refinery /Floating Roof Tanks 

/Distillate Fuel #2: Standing Loss (67000 Bbl Tank)

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40301199 Petrol Prod Stor-Refinery /Floating Roof Tanks 

/Specify Liquid: Standing Loss (250000 Bbl Tank)

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40301299 Petrol Prod Stor-Refinery /Variable Vapor Space 

/Specify Liquid: Filling Loss

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40388801 Petrol Prod Stor-Refinery /Fugitive Emissions 

/Specify in Comments Field

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40400302 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank: Working Loss

No change required Condensate/crude oil tank

0504 40400311 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank, Condensate, working+breathing+flashing 

losses

No change required Condensate/crude oil tank

0504 40400316 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank, Diesel, working+breathing+flashing losses

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40400498 Petrol Prod Stor-Underground Tanks /Specify 

Liquid: Working Loss

No change required Condensate/crude oil tank

0504 40600132 Petrol Trans & Marketg /Tank Cars & Trucks 

/Crude Oil: Submerged Loading (Normal Service)

Change from 0504 to 0501 Truck/Railcar Unloading

0504 40600134 Petrol Trans & Marketg /Tank Cars & Trucks 

/Kerosene: Submerged Loading (Normal Services)

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40600135 Petrol Trans & Marketg /Tank Cars & Trucks 

/Distillate Oil: Submerged Loading (Normal 

Service)

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40600401 Petrol Trans & Marketg /Filling Vehicle Gas Tanks 

- Stage II /Vapor Loss w/o Controls

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned
A-19

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0504 40600402 Petrol Trans & Marketg /Filling Vehicle Gas Tanks 

- Stage II /Liquid Spill Loss w/o Controls

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40600403 Petrol Trans & Marketg /Filling Vehicle Gas Tanks 

- Stage II /Vapor Loss w/o Controls

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40700815 Organic Chem Storage - Fixed Roof Tanks -

Methyl Alcohol: Breathing Loss

No change required Storage tanks: methanol

0504 40705604 Organic Chem Storage - Fixed Roof Tanks -

Ethylene Glycol: Working Loss

No change required Storage tanks: glycol

0504 40705610 Organic Chem Storage - Fixed Roof Tanks -

Propylene Glycol: Working Loss

No change required Storage tanks: glycol

0504 40714697 Organic Chem Storage - Fixed Roof Tanks -

Specify In Comments: Breathing Loss

No change required Condensate/crude oil tank

0504 40787299 Organic Chem Storage - Pressure Tanks - Specify 

Mercaptan: Withdrawal Loss

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 40799997 Organic Chem Storage - Miscellaneous /Specify in 

Comments

No change required Condensate/crude oil tank

0504 49099998 Solvent Evap /Misc Volatile Organic Evaporation 

/Identify the Process and Solvent in Comments

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 49099999 Solvent Evap /Misc Volatile Organic Evaporation 

/Identify the Process and Solvent in Comments

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 50200601 Waste Disp-Comm-Inst /Landfill Dump /Waste Gas 

Flares ** (Use 5-01-004-10)

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 50300820 Waste Disp-Indus /Treatment, Storage, Disp /Land 

Treatment: Fugitive Emissions

Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0504 50300901 Waste Disp-Indus /Asbestos Removal /General Not in 0504 reassign to new MACT 

code as appropriate

no point assigned

0601 40400150 Petrol Prod Stor-Bulk Terminals /Miscellaneous 

Losses/Leaks: Loading Racks

change from 0601 to 0501 Truck/Railcar Unloading

0601 40400151 Petrol Prod Stor-Bulk Terminals /Valves, Flanges, 

and Pumps

change from 0601 to 0501 Equipment Leaks: other

0601 40400154 Petrol Prod Stor-Bulk Terminals /Tank Truck 

Vapor Leaks

change from 0601 to 0501 Truck/Railcar Unloading

0601 40400251 Petrol Prod Stor-Bulk Plants /Valves, Flanges, and 

Pumps

change from 0601 to 0501 Equipment Leaks: other
A-20

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

0601 40400254 Petrol Prod Stor-Bulk Plants /Tank Truck Vapor 

Losses

change from 0601 to 0501 Truck/Railcar Unloading

0802 40300102 Petrol Prod Stor-Refinery /Tank Type Unknown 

/Crude

Change from 0802 to 0501 Condensate/crude oil tank

0802 40300104 Petrol Prod Stor-Refinery /Tank Type Unknown 

/Crude

Change from 0802 to 0501 Condensate/crude oil tank

0802 40301117 Petrol Prod Stor-Refinery /Floating Roof Tanks 

/Crude Oil RVP 5: Withdrawal Loss

Change from 0802 to 0501 Condensate/crude oil tank

0802 40400250 Petrol Prod Stor-Bulk Plants /Loading Racks Change from 0802 to 0501 Truck/Railcar Unloading

1670 40300104 Petrol Prod Stor-Refinery /Tank Type Unknown 

/Crude

Change from 1670 to 0501 Condensate/crude oil tank

1670 40400301 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank: Breathing Loss

Change from 1670 to 0501 Condensate/crude oil tank

1670 40400302 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank: Working Loss

Change from 1670 to 0501 Condensate/crude oil tank

1670 40400311 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank, Condensate, working+breathing+flashing 

losses

Change from 1670 to 0501 Condensate/crude oil tank

1670 40400315 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank, Produced Water, 

working+breathing+flashing

Change from 1670 to 0501 Produced Water Tanks

1670 40600132 Petrol Trans & Marketg /Tank Cars & Trucks 

/Crude Oil: Submerged Loading (Normal Service)

Change from 1670 to 0501 Truck/Railcar Unloading

1670 40600199 Petrol Trans & Marketg /Tank Cars & Trucks /Not 

Classified **

Change from 1670 to 0501 Truck/Railcar Unloading

1670 40703297 Organic Chem Storage - Fixed Roof Tanks -

Specify Amine: Breathing Loss

Change from 1670 to 0501 Storage tanks: amine

1670 40705697 Organic Chem Storage - Fixed Roof Tanks -

Specify Glycol: Breathing Loss

Change from 1670 to 0501 Storage tanks: glycol

1670 40714698 Organic Chem Storage - Fixed Roof Tanks -

Specify In Comments: Working Loss

Change from 1670 to 0501 Condensate/crude oil tank

NONE 30103202 Chem Manuf /Elemental Sulfur Production /Mod. 

Claus: 3 Stage w/o Control (95-96% Removal)

change from NONE to 0501 Sulfur Recovery

NONE 30103203 Chem Manuf /Elemental Sulfur Production /Mod. 

Claus: 4 Stage w/o Control (96-97% Removal)

change from NONE to 0501 Sulfur Recovery
A-21

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

NONE 30600401 Petrol Indus /Blowdown Systems /Blowdown

System with Vapor Recovery System with Flaring

change from NONE to 0501 Pipeline Blowdowns/Maintenance

NONE 30600402 Petrol Indus /Blowdown Systems /Blowdown 

System w/o Controls

change from NONE to 0501 Pipeline Blowdowns/Maintenance

NONE 30600503 Petrol Indus /Wastewater Treatment /Process 

Drains and Wastewater Separators

change from NONE to 0501 Wastewater treatment

NONE 30600505 Petrol Indus /Wastewater Treatment /Wastewater 

Treatment w/o Separator

change from NONE to 0501 Wastewater treatment

NONE 30600508 Petrol Indus /Wastewater Treatment /Oil/Water 

Separator

change from NONE to 0501 Separation

NONE 30600801 Petrol Indus /Fugitive Emissions /Pipeline Valves 

and Flanges

change from NONE to 0501 Pipeline Leaks: Other

NONE 30600802 Petrol Indus /Fugitive Emissions /Vessel Relief 

Valves

change from NONE to 0501 Equipment Leaks: other

NONE 30600803 Petrol Indus /Fugitive Emissions /Pump Seals w/o 

Controls

change from NONE to 0501 Equipment Leaks: other

NONE 30600811 Petrol Indus /Fugitive Emissions /Pipeline Valves: 

Gas Streams

change from NONE to 0501 Pipeline Leaks: Other

NONE 30600812 Petrol Indus /Fugitive Emissions /Pipeline Valves: 

Light Liquid/Gas Streams

change from NONE to 0501 Pipeline Leaks: Other

NONE 30600815 Petrol Indus /Fugitive Emissions /Open-ended 

Valves: All Streams

change from NONE to 0501 Equipment Leaks: other

NONE 30600816 Petrol Indus /Fugitive Emissions /Flanges: All 

Streams

change from NONE to 0501 Equipment Leaks: other

NONE 30600817 Petrol Indus /Fugitive Emissions /Pump Seals: 

Light Liquid/Gas Streams

change from NONE to 0501 Equipment Leaks: other

NONE 30600819 Petrol Indus /Fugitive Emissions /Compressor 

Seals: Gas Streams

change from NONE to 0501 Compressor seals: other

NONE 30600822 Petrol Indus /Fugitive Emissions /Vessel Relief 

Valves: All Streams

change from NONE to 0501 Equipment Leaks: other

NONE 30600903 Petrol Indus /Flares /Natural Gas change from NONE to 0501 Flares

NONE 30600904 Petrol Indus /Flares /Process Gas change from NONE to 0501 Flares

NONE 30603301 Petrol Indus /Desulfurization /Sulfur Recovery Unit change from NONE to 0501 Sulfur Recovery

NONE 30609903 Petrol Indus /Incinerators /Natural Gas change from NONE to 0501 Incinerators

NONE 30609904 Petrol Indus /Incinerators /Process Gas change from NONE to 0501 Incinerators
A-22

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

NONE 30688801 Petrol Indus /Fugitive Emissions /Specify in 

Comments Field

change from NONE to 0501 Fugitives: Other

NONE 31000101 Crude Oil Production /Complete Well: Fugitive 

Emissions

change from NONE to 0501 Well Completions

NONE 31000102 Crude Oil Production /Miscellaneous Well: General change from NONE to 0501 Wells: Other

NONE 31000103 Crude Oil Production /Wells: Rod Pumps change from NONE to 0501 Wells: Other

NONE 31000104 Crude Oil Production /Crude Oil Sumps change from NONE to 0501 Oil and Gas Miscellaneous

NONE 31000105 Crude Oil Production /Crude Oil Pits change from NONE to 0501 Oil and Gas Miscellaneous

NONE 31000107 Crude Oil Production /Oil/Gas/Water/Separation change from NONE to 0501 Separation

NONE 31000108 Crude Oil Production /Evaporation from Liquid 

Leaks into Oil Well Cellars

change from NONE to 0501 Equipment Leaks: other

NONE 31000122 Crude Oil Production /Drilling and Well 

Completion

change from NONE to 0501 Well Completions

NONE 31000123 Crude Oil Production /Well Casing Vents change from NONE to 0501 Wells: Other

NONE 31000124 Crude Oil Production /Valves: General change from NONE to 0501 Equipment leaks: Production

NONE 31000125 Crude Oil Production /Relief Valves change from NONE to 0501 Equipment leaks: Production

NONE 31000126 Crude Oil Production /Pump Seals change from NONE to 0501 Equipment leaks: Production

NONE 31000127 Crude Oil Production /Flanges and Connections change from NONE to 0501 Equipment Leaks: other

NONE 31000129 Crude Oil Production /Gas/Liquid Separation change from NONE to 0501 Separation

NONE 31000130 Crude Oil Production /Fugitives: Compressor Seals change from NONE to 0501 Compressor Seals: Production

NONE 31000132 Crude Oil Production /Atmospheric Wash Tank 

(2nd Stage of Gas-Oil Separation): Flashing Loss

change from NONE to 0501 Separation

NONE 31000146 Crude Oil Production /Gathering Lines change from NONE to 0501 Pipeline Leaks: production

NONE 31000160 Crude Oil Production /Flares change from NONE to 0501 Flares

NONE 31000199 Crude Oil Production /Processing Operations: Not 

Classified

change from NONE to 0501 Oil and Gas Miscellaneous

NONE 31000201 Natural Gas Production /Gas Sweetening: Amine 

Process

change from NONE to 0501 Amine Treaters

NONE 31000202 Natural Gas Production /Gas Stripping Operations change from NONE to 0501 Oil and Gas Miscellaneous

NONE 31000203 Natural Gas Production /Compressors change from NONE to 0501 Compressor Leaks: Other

NONE 31000204 Natural Gas Production /Wells change from NONE to 0501 Wells: Other

NONE 31000205 Natural Gas Production /Flares change from NONE to 0501 Flares

NONE 31000207 Natural Gas Production /Valves: Fugitive 

Emissions

change from NONE to 0501 Equipment leaks: Production
A-23

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

NONE 31000208 Natural Gas Production /Sulfur Recovery Unit change from NONE to 0501 Sulfur Recovery

NONE 31000209 Natural Gas Production /Incinerators Burning 

Waste Gas or Augmented Waste Gas

change from NONE to 0501 Incinerators

NONE 31000211 Natural Gas Production /Pipeline Pigging (releases 

during pig removal)

change from NONE to 0501 Pipeline Blowdowns/Maintenance

NONE 31000215 Natural Gas Production /Flares Combusting Gases 

:1000 BTU/scf

change from NONE to 0501 Flares

NONE 31000216 Natural Gas Production /Flares Combusting Gases 

<1000 BTU/scf

change from NONE to 0501 Flares

NONE 31000220 Natural Gas Production /All Equipt Leak Fugitives 

(Valves, Flanges, Connections, Seals, Drains

change from NONE to 0501 Equipment Leaks: other

NONE 31000223 Natural Gas Production /Relief Valves change from NONE to 0501 Equipment leaks: Production

NONE 31000224 Natural Gas Production /Pump Seals change from NONE to 0501 Equipment leaks: Production

NONE 31000225 Natural Gas Production /Compressor Seals change from NONE to 0501 Compressor Seals: Production

NONE 31000226 Natural Gas Production /Flanges and Connections change from NONE to 0501 Equipment Leaks: other

NONE 31000227 Natural Gas Production /Glycol Dehydrator 

Reboiler Still Stack

change from NONE to 0501 Dehydrators

NONE 31000228 Natural Gas Production /Glycol Dehydrator 

Reboiler Burner

change from NONE to 0501 Dehydrators

NONE 31000229 Natural Gas Production /Gathering Lines change from NONE to 0501 Pipeline Leaks: production

NONE 31000230 Natural Gas Production /Hydrocarbon Skimmer change from NONE to 0501 Oil and Gas Miscellaneous

NONE 31000299 Natural Gas Production /Other Not Classified change from NONE to 0501 Oil and Gas Miscellaneous

NONE 31000301 Natural Gas Proc Facilities /Glycol Dehydrators: 

Reboiler Still Vent: Triethylene Glycol

change from NONE to 0501 Dehydrators

NONE 31000302 Natural Gas Proc Facilities /Glycol Dehydrators: 

Reboiler Burner Stack: Triethylene Glycol

change from NONE to 0501 Dehydrators

NONE 31000303 Natural Gas Proc Facilities /Glycol Dehydrators: 

Phase Separator Vent: Triethylene Glycol

change from NONE to 0501 Dehydrators

NONE 31000304 Natural Gas Proc Facilities /Glycol Dehydrators: 

Ethylene Glycol: General

change from NONE to 0501 Dehydrators

NONE 31000305 Natural Gas Proc Facilities /Gas Sweeting: Amine 

Process

change from NONE to 0501 Amine Treaters

NONE 31000306 Natural Gas Proc Facilities /Process Valves change from NONE to 0501 Equipment leaks: Processing

NONE 31000307 Natural Gas Proc Facilities /Relief Valves change from NONE to 0501 Equipment leaks: Processing

NONE 31000309 Natural Gas Proc Facilities /Compressor Seals change from NONE to 0501 Compressor Seals: Processing
A-24

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

NONE 31000321 Natural Gas Proc Facilities /Glycol Dehydrators: 

Niagaran Formation (Mich.)

change from NONE to 0501 Dehydrators

NONE 31000322 Natural Gas Proc Facilities /Glycol Dehydrators: 

Prairie du Chien Formation (Mich.)

change from NONE to 0501 Dehydrators

NONE 31000323 Natural Gas Proc Facilities /Glycol Dehydrators: 

Antrim Formation (Mich.)

change from NONE to 0501 Dehydrators

NONE 31000502 Oil&Gas Prod /Liquid Waste Treatment /Liquid -

Liquid Separator

change from NONE to 0501 Separation

NONE 31000503 Oil&Gas Prod /Liquid Waste Treatment /Oil-Water 

Separator

change from NONE to 0501 Separation

NONE 31000506 Oil&Gas Prod /Liquid Waste Treatment /Oil-Water 

Separation Wastewater Holding Tanks

change from NONE to 0501 Separation

NONE 31088801 Oil&Gas Prod /Fugitive Emissions /Specify in 

Comments Field

change from NONE to 0501 Fugitives: Production

NONE 31088802 Oil&Gas Prod /Fugitive Emissions /Specify in 

Comments Field

change from NONE to 0501 Fugitives: Production

NONE 31088803 Oil&Gas Prod /Fugitive Emissions /Specify in 

Comments Field

change from NONE to 0501 Fugitives: Production

NONE 31088804 Oil&Gas Prod /Fugitive Emissions /Specify in 

Comments Field

change from NONE to 0501 Fugitives: Production

NONE 31088805 Oil&Gas Prod /Fugitive Emissions /Specify in 

Comments Field

change from NONE to 0501 Fugitives: Production

NONE 31088811 Oil&Gas Prod /Fugitive Emissions /Fugitive 

Emissions

change from NONE to 0501 Fugitives: Production

NONE 39090010 Fuel Storage - Fixed Roof Tanks /Residual 

Oil/Crude Oil: Working Loss

change from NONE to 0501 Condensate/crude oil tank

NONE 40300102 Petrol Prod Stor-Refinery /Tank Type Unknown 

/Crude

change from NONE to 0501 Condensate/crude oil tank

NONE 40300104 Petrol Prod Stor-Refinery /Tank Type Unknown 

/Crude

change from NONE to 0501 Condensate/crude oil tank

NONE 40300203 Petrol Prod Stor-Refinery /Tank Type Unknown 

/Crude

change from NONE to 0501 Condensate/crude oil tank

NONE 40300204 Petrol Prod Stor-Refinery /Tank Type Unknown 

/Crude

change from NONE to 0501 Condensate/crude oil tank
A-25

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

NONE 40301010 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Crude Oil RVP 5: Breathing Loss (67000 Bbl 

Tank)

change from NONE to 0501 Condensate/crude oil tank

NONE 40301011 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Crude Oil RVP 5: Breathing Loss (250000 Bbl 

Tank)

change from NONE to 0501 Condensate/crude oil tank

NONE 40301012 Petrol Prod Stor-Refinery /Fixed Roof Tanks 

/Crude Oil RVP 5: Working Loss

change from NONE to 0501 Condensate/crude oil tank

NONE 40301109 Petrol Prod Stor-Refinery /Floating Roof Tanks 

/Crude Oil RVP 5: Standing Loss (67000 Bbl Tank)

change from NONE to 0501 Condensate/crude oil tank

NONE 40301110 Petrol Prod Stor-Refinery /Floating Roof Tanks 

/Crude Oil RVP 5: Standing Loss (250000 Bbl 

Tank)

change from NONE to 0501 Condensate/crude oil tank

NONE 40301117 Petrol Prod Stor-Refinery /Floating Roof Tanks 

/Crude Oil RVP 5: Withdrawal Loss

change from NONE to 0501 Condensate/crude oil tank

NONE 40301132 Petrol Prod Stor-Refinery /Floating Roof Tanks 

/Crude Oil: Standing Loss - External - Primary Seal

change from NONE to 0501 Condensate/crude oil tank

NONE 40301142 Petrol Prod Stor-Refinery /Floating Roof Tanks 

/Crude Oil: Standing Loss - External - Secondary 

Seal

change from NONE to 0501 Condensate/crude oil tank

NONE 40301152 Petrol Prod Stor-Refinery /Floating Roof Tanks 

/Crude Oil: Standing Loss - Internal

change from NONE to 0501 Condensate/crude oil tank

NONE 40400140 Petrol Prod Stor-Bulk Terminals /Specify Liquid: 

Standing Loss - Ext. Float Roof Tank w/ Secondy 

Seal

change from NONE to 0501 Condensate/crude oil tank

NONE 40400149 Petrol Prod Stor-Bulk Terminals /Specify Liquid: 

External Floating Roof (Primary/Secondary Seal)

change from NONE to 0501 Condensate/crude oil tank

NONE 40400150 Petrol Prod Stor-Bulk Terminals /Miscellaneous 

Losses/Leaks: Loading Racks

change from NONE to 0501 Truck/Railcar Unloading

NONE 40400250 Petrol Prod Stor-Bulk Plants /Loading Racks change from NONE to 0501 Truck/Railcar Unloading

NONE 40400301 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank: Breathing Loss

change from NONE to 0501 Condensate/crude oil tank

NONE 40400302 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank: Working Loss

change from NONE to 0501 Condensate/crude oil tank
A-26

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

NONE 40400303 Oil&Gas Field Stor&Workg Tanks /External 

Floating Roof Tank with Primary Seals: Standing 

Loss

change from NONE to 0501 Condensate/crude oil tank

NONE 40400304 Oil&Gas Field Stor&Workg Tanks /External 

Floating Roof Tank with Secondary Seals: Standing 

Loss

change from NONE to 0501 Condensate/crude oil tank

NONE 40400305 Oil&Gas Field Stor&Workg Tanks /Internal 

Floating Roof Tank: Standing Loss

change from NONE to 0501 Condensate/crude oil tank

NONE 40400306 Oil&Gas Field Stor&Workg Tanks /External 

Floating Roof Tank: Withdrawal Loss

change from NONE to 0501 Condensate/crude oil tank

NONE 40400307 Oil&Gas Field Stor&Workg Tanks /Internal 

Floating Roof Tank: Withdrawal Loss

change from NONE to 0501 Condensate/crude oil tank

NONE 40400311 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank, Condensate, working+breathing+flashing 

losses

change from NONE to 0501 Condensate/crude oil tank

NONE 40400312 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank, Crude Oil, working+breathing+flashing 

losses

change from NONE to 0501 Condensate/crude oil tank

NONE 40400314 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank, Specialty Chem-working+breathing+flashing

change from NONE to 0501 Condensate/crude oil tank

NONE 40400315 Oil&Gas Field Stor&Workg Tanks /Fixed Roof 

Tank, Produced Water, 

working+breathing+flashing

change from NONE to 0501 Produced Water Tanks

NONE 40400321 Oil&Gas Field Stor&Workg Tanks /External 

Floating Roof Tank, Condensate, 

working+breathing+flashing

change from NONE to 0501 Condensate/crude oil tank

NONE 40400322 Oil&Gas Field Stor&Workg Tanks /External 

Floating Roof Tank, Crude Oil, 

working+breathing+flashing

change from NONE to 0501 Condensate/crude oil tank

NONE 40400340 Oil&Gas Field Stor&Workg Tanks /Pressure Tanks 

(pressure relief from pop-off valves)

change from NONE to 0501 Condensate/crude oil tank

NONE 40400407 Petrol Prod Stor-Underground Tanks /Crude Oil 

RVP 5: Breathing Loss

change from NONE to 0501 Condensate/crude oil tank

NONE 40400408 Petrol Prod Stor-Underground Tanks /Crude Oil 

RVP 5: Working Loss

change from NONE to 0501 Condensate/crude oil tank
A-27

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

NONE 40400497 Petrol Prod Stor-Underground Tanks /Specify 

Liquid: Breathing Loss

change from NONE to 0501 Condensate/crude oil tank

NONE 40400498 Petrol Prod Stor-Underground Tanks /Specify 

Liquid: Working Loss

change from NONE to 0501 Condensate/crude oil tank

NONE 40600132 Petrol Trans & Marketg /Tank Cars & Trucks 

/Crude Oil: Submerged Loading (Normal Service)

change from NONE to 0501 Truck/Railcar Unloading

NONE 40600137 Petrol Trans & Marketg /Tank Cars & Trucks 

/Crude Oil: Splash Loading (Normal Service)

change from NONE to 0501 Truck/Railcar Unloading

NONE 40600142 Petrol Trans & Marketg /Tank Cars & Trucks 

/Crude Oil: Submerged Loading (Balanced Service)

change from NONE to 0501 Truck/Railcar Unloading

NONE 40600164 Petrol Trans & Marketg /Tank Cars & Trucks 

/Crude Oil: Loaded with Product

change from NONE to 0501 Truck/Railcar Unloading

NONE 40600243 Petrol Trans & Marketg /Marine Vessels /Crude 

Oil: Loading Tankers

change from NONE to 0501 Truck/Railcar Unloading

NONE 40600248 Petrol Trans & Marketg /Marine Vessels /Crude 

Oil: Loading Barges

change from NONE to 0501 Truck/Railcar Unloading

NONE 40600503 Petrol Trans & Marketg /Pipeline Transp - All 

Products /Pump Station

change from NONE to 0501 Truck/Railcar Unloading

NONE 40688801 Petrol Trans & Marketg /Fugitive Emissions 

/Specify in Comments Field

change from NONE to 0501 Fugitives: Other

NONE 40688802 Petrol Trans & Marketg /Fugitive Emissions 

/Specify in Comments Field

change from NONE to 0501 Fugitives: Other

NONE 40700815 Organic Chem Storage - Fixed Roof Tanks -

Methyl Alcohol: Breathing Loss

change from NONE to 0501 Storage tanks: methanol

NONE 40700816 Organic Chem Storage - Fixed Roof Tanks -

Methyl Alcohol: Working Loss

change from NONE to 0501 Storage tanks: methanol

NONE 40703203 Organic Chem Storage - Fixed Roof Tanks -

Ethanolamines: Breathing Loss

change from NONE to 0501 Storage tanks: amine

NONE 40703204 Organic Chem Storage - Fixed Roof Tanks -

Ethanolamines: Working Loss

change from NONE to 0501 Storage tanks: amine

NONE 40703297 Organic Chem Storage - Fixed Roof Tanks -

Specify Amine: Breathing Loss

change from NONE to 0501 Storage tanks: amine

NONE 40703298 Organic Chem Storage - Fixed Roof Tanks -

Specify Amine: Working Loss

change from NONE to 0501 Storage tanks: amine
A-28

Table A-1. SCC Revisions and Emission Process Group Assignments (Cont.)

PROCESS_MACT_CODE SCC SCC_Description MACT Code Revisions Emission Process Group

NONE 40705217 Organic Chem Storage - Fixed Roof Tanks -

Triethylene Glycol: Breathing Loss

change from NONE to 0501 Storage tanks: glycol

NONE 40705297 Organic Chem Storage - Fixed Roof Tanks -

Specify Glycol Ether: Breathing Loss

change from NONE to 0501 Storage tanks: glycol

NONE 40705603 Organic Chem Storage - Fixed Roof Tanks -

Ethylene Glycol: Breathing Loss

change from NONE to 0501 Storage tanks: glycol

NONE 40705604 Organic Chem Storage - Fixed Roof Tanks -

Ethylene Glycol: Working Loss

change from NONE to 0501 Storage tanks: glycol

NONE 40705610 Organic Chem Storage - Fixed Roof Tanks -

Propylene Glycol: Working Loss

change from NONE to 0501 Storage tanks: glycol

NONE 40714697 Organic Chem Storage - Fixed Roof Tanks -

Specify In Comments: Breathing Loss

change from NONE to 0501 Condensate/crude oil tank

NONE 40714698 Organic Chem Storage - Fixed Roof Tanks -

Specify In Comments: Working Loss

change from NONE to 0501 Condensate/crude oil tank

NONE 40729697 Organic Chem Storage - Floating Roof Tanks -

Specify In Comments: Breathing Loss

change from NONE to 0501 Condensate/crude oil tank

NONE 40729698 Organic Chem Storage - Floating Roof Tanks -

Specify In Comments: Working Loss

change from NONE to 0501 Condensate/crude oil tank

NONE 40799997 Organic Chem Storage - Miscellaneous /Specify in 

Comments

change from NONE to 0501 Condensate/crude oil tank

NONE 40799998 Organic Chem Storage - Miscellaneous /Specify in 

Comments

change from NONE to 0501 Condensate/crude oil tank

NONE 40799999 Organic Chem Storage - Miscellaneous /Other Not 

Classified

change from NONE to 0501 Condensate/crude oil tank

NONE 40899995 Organic Chem Transport /Specific Liquid 

/Cars/Trucks: Loading Rack

change from NONE to 0501 Truck/Railcar Unloading

NONE 40899999 Organic Chem Transport /Specific Liquid /Loading 

Rack

change from NONE to 0501 Truck/Railcar Unloading

NONE 42500101 Fixed Roof Tanks (210 Bbl Size) Breathing Loss change from NONE to 0501 Condensate/crude oil tank

NONE 49090023 Solvent Evap /Fuel Fired Equipment /Natural Gas: 

Flares

change from NONE to 0501 Flares