OCS Study

BOEM 2022-048

U.S. Department of the Interior

Bureau of Ocean Energy Management

Sterling, VA

Outer Continental Shelf Air Quality 

System (OCS AQS)

Operator User Manual (Version 1.9)
OCS Study

BOEM 2022-048

U.S. Department of the Interior

Bureau of Ocean Energy Management

Sterling, VA

Outer Continental Shelf Air Quality 

System (OCS AQS)

Operator User Manual (Version 1.9)

September 2022

Authors:

Jesse The’, Cris The’, Mohammad Munshed, Alexandra Torrens, Hanin Alkabbani

Prepared under Contract # 140E0119C0006

By

Xator Corporation

1835 Alexander Bell Drive, Suite 210

Reston, Virginia 20191

Lakes Environmental Software

170 Columbia St. W. Suite 1

Waterloo, Ontario, N2L 3L3 

Canada
DISCLAIMER

Study concept, oversight, and funding were provided by the U.S. Department of the Interior, Bureau of 

Ocean Energy Management (BOEM), Environmental Studies Program, Washington, DC, under Contract 

Number 140E0119C0006. This report has been technically reviewed by BOEM, and it has been approved 

for publication. The views and conclusions contained in this document are those of the authors and should 

not be interpreted as representing the opinions or policies of BOEM, nor does mention of trade names or 

commercial products constitute endorsement or recommendation for use.

REPORT AVAILABILITY

To download a PDF file of this report, go to the U.S. Department of the Interior, Bureau of Ocean Energy 

Management Data and Information Systems webpage (http://www.boem.gov/Environmental-StudiesEnvData/), click on the link for the Environmental Studies Program Information System (ESPIS), and 

search on 2022-048. The report is also available at the National Technical Reports Library at 

https://ntrl.ntis.gov/NTRL/. 

CITATION

Thé J, Thé C, Munshed M, Torrens A, Alkabbani H. 2022. Outer Continental Shelf Air Quality System 

(OCS AQS) operator user manual (version 1.9). Sterling (VA): U.S. Department of the Interior, 

Bureau of Ocean Energy Management. 201 p. Report No.: OCS Study BOEM 2022-048. 
OCS AQS Operator User Manual v.1.9

ii

Table of Contents

List of Figures .............................................................................................................................................v

List of Tables .............................................................................................................................................vii

List of Acronyms and Abbreviations .....................................................................................................viii

Units of Measure ........................................................................................................................................ix

1 Getting Started with OCS AQS ..........................................................................................................1

1.1 About this Document.....................................................................................................................1

1.2 Supported Browsers......................................................................................................................1

1.3 Accessing OCS AQS ....................................................................................................................2

1.4 Logging in the First Time...............................................................................................................2

1.5 System Security ............................................................................................................................4

1.5.1 Automatic Logout ......................................................................................................................4

1.5.2 Password Recovery ..................................................................................................................4

1.6 Navigating the System ..................................................................................................................4

1.6.1 Overview ...................................................................................................................................4

1.6.2 Using Windows and Tables.......................................................................................................5

1.6.3 Panel Controls...........................................................................................................................6

1.6.4 Getting Help ..............................................................................................................................7

1.7 Selecting Inventories.....................................................................................................................8

1.8 OCS AQS Modules .......................................................................................................................9

1.9 OCS AQS Definitions ..................................................................................................................10

1.10 OCS AQS Function Map.............................................................................................................10

1.11 Layout of User Manual ................................................................................................................12

2 Dashboards .......................................................................................................................................13

2.1 Dashboard Overview...................................................................................................................13

2.2 Operator Submittals Dashboard..................................................................................................15

2.2.1 Begin Submission Process .....................................................................................................18

2.3 Submittal Corrective Action.........................................................................................................20

3 Emissions: Platform Sources..........................................................................................................21

3.1 Platform Sources Workflow.........................................................................................................21

3.2 Using the Activity & Emissions Manager ....................................................................................22

3.2.1 Activity & Emissions Manager Details Page ...........................................................................23

3.2.2 Updating Annual Production Rate and Sales Gas Composition.............................................24

3.2.3 Importing Amine & Glycol Emissions ......................................................................................26

3.2.4 Updating Facility Details..........................................................................................................29

3.2.5 Emission Units & Processes ...................................................................................................30

3.2.6 Decommissioned Facilities......................................................................................................37

3.2.7 Release Point & Apportionment..............................................................................................37

3.2.8 Calculator Parameters & Requests.........................................................................................42

3.2.9 Updating Monthly Data............................................................................................................48

3.2.10 Zero Emissions........................................................................................................................54

3.2.11 Copying Months ......................................................................................................................55

3.2.12 Calculate Emissions................................................................................................................57

3.2.13 Global Warming Potential Details ...........................................................................................58

3.2.14 Combustion Flares ..................................................................................................................59

3.2.15 Adding Supporting Documentation .........................................................................................60

3.3 Batch Emissions Calculator (BEC) – Platform Sources..............................................................62

3.3.1 View Previous Facility Calculations ........................................................................................62
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3.3.2 Run New Facility-Wide Calculations .......................................................................................62

3.3.3 BEC Job Queue ......................................................................................................................63

3.4 Companies & Complexes............................................................................................................63

3.4.1 Companies ..............................................................................................................................63

3.4.2 Complexes ..............................................................................................................................67

3.4.3 Facilities ..................................................................................................................................68

3.4.4 Supporting Documentation......................................................................................................68

3.5 Remove Unassigned Release Points .........................................................................................69

4 Emissions: Lease Operations..........................................................................................................70

4.1 Managing Lease Operations .......................................................................................................70

4.2 Lease Operations Emissions Manager.......................................................................................71

4.2.1 Add a Lease ............................................................................................................................72

4.2.2 Lease Source vs Emission Process........................................................................................72

4.2.3 Edit Existing Lease Operation Sources ..................................................................................74

4.2.4 Add Lease Operation Source..................................................................................................75

4.2.5 Add/Delete Lease Operation Processes.................................................................................76

4.2.6 Calculator Parameters & Requests.........................................................................................78

4.2.7 Calculate Lease Operation Emissions ....................................................................................80

5 Emissions: Tools ..............................................................................................................................81

5.1 Facility Activity Data Import/Export .............................................................................................81

5.2 Facility e-GGRT Export ...............................................................................................................82

5.3 Facility Metadata Export..............................................................................................................83

6 Documents.........................................................................................................................................85

6.1 Documents ..................................................................................................................................85

6.1.1 Public Documents ...................................................................................................................85

6.1.2 My Documents ........................................................................................................................86

7 Map .....................................................................................................................................................88

7.1 Using the Map Module ................................................................................................................89

7.2 Gridded Emissions ......................................................................................................................92

7.3 Displayed Feature Information....................................................................................................94

7.4 Additional Map Layers.................................................................................................................94

8 Reports...............................................................................................................................................95

8.1 Reports Overview........................................................................................................................95

8.2 Report Categories .......................................................................................................................96

8.2.1 Platforms Reports ...................................................................................................................96

8.2.2 Platform Emissions Reports....................................................................................................96

8.2.3 Monthly Platform Emissions Reports ......................................................................................96

8.2.4 Platform Emission Manager Reports ......................................................................................96

8.2.5 GHG Emissions Reports .........................................................................................................96

8.2.6 Lease Operation Reports ........................................................................................................96

8.2.7 Calculators Reports.................................................................................................................96

8.2.8 Trend Analysis Reports...........................................................................................................97

8.2.9 Other Reports..........................................................................................................................97

8.2.10 Using Permalinks ....................................................................................................................97

9 Settings ..............................................................................................................................................98

9.1 User Options ...............................................................................................................................98

9.1.1 Inventory Configuration ...........................................................................................................98

9.1.2 Notifications.............................................................................................................................99

9.2 Auditing .....................................................................................................................................100
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9.2.1 Account Activity.....................................................................................................................100

9.2.2 Change History Report..........................................................................................................101

Appendix A – Calculator Descriptions..................................................................................................103

A.1 AMI-000 (Amine Gas Sweetening Unit)....................................................................................103

A.2 BOI-M01R (Boilers, Heaters, and Burners – Diesel) ................................................................104

A.3 BOI-M02R (Boilers, Heaters, and Burners – Waste Oil)...........................................................107

A.4 BOI-M03R (Boilers, Heaters, and Burners – Natural Gas, Process Gas, or Waste Gas) ........110

A.5 DIE-M01R (Gasoline Engines)..................................................................................................113

A.6 DIE-M02R (Diesel Engines, Max HP < 600).............................................................................115

A.7 DIE-M03R (Diesel Engines, Max HP >= 600)...........................................................................117

A.8 DRI-M01R (Drilling Equipment – Gasoline Fuel) ......................................................................120

A.9 DRI-M02R (Drilling Equipment – Diesel Fuel) ..........................................................................122

A.10 DRI-M03R (Drilling Equipment – Natural Gas Fuel) .................................................................124

A.11 FLA-M01 (Combustion Flare)....................................................................................................126

A.12 FLA-M02 (Combustion Flares – Pilot).......................................................................................127

A.13 FUG-M01 (Fugitive Sources – Gas)..........................................................................................128

A.14 FUG-M02 (Fugitive Sources – Liquid Natural Gas) ..................................................................130

A.15 FUG-M03 (Fugitive Sources – Heavy Oil) ................................................................................132

A.16 FUG-M04 (Fugitive Sources –Light Oil)....................................................................................134

A.17 FUG-M05 (Fugitive Sources – Water / Oil)...............................................................................136

A.18 FUG-M06 (Fugitive Sources – Water / Oil / Gas) .....................................................................138

A.19 GLY-000 (Glycol Dehydrator Unit)............................................................................................140

A.20 LOA-M01R (Loading Operations) .............................................................................................141

A.21 LOS-M01R (Losses from Flashing)...........................................................................................143

A.22 MUD-M01 (Mud Degassing) .....................................................................................................145

A.23 NGE-M01R (Natural Gas Engine – Engine Stroke Cycle = 2-Cycle and Engine Burn = Lean)146

A.24 NGE-M02R (Natural Gas Engine – Engine Stroke Cycle = 4-Cycle and Engine Burn = Lean)149

A.25 NGE-M03R (Natural Gas Engine – Engine Stroke Cycle = 4-Cycle and Engine Burn = Rich) 152

A.26 NGE-M04R (Natural Gas Engine – Engine Burn =clean).........................................................154

A.27 NGT-M01R (Dual-Fuel Turbines – Nat. Gas – Known Sulfur)..................................................157

A.28 NGT-M02R (Dual-Fuel Turbines – Nat. Gas – Unknown Sulfur)..............................................159

A.29 NGT-M03R (Dual-Fuel Turbines – Diesel)................................................................................162

A.30 PNE-M01R (Pneumatic Pumps) ...............................................................................................165

A.31 PRE-M01R (Pneumatic Controllers).........................................................................................167

A.32 STO-M01R (Storage Tank – Horizontal, Rectangular Tank)....................................................169

A.33 STO-M02R (Storage Tank – Vertical, Rectangular Tank) ........................................................172

A.34 STO-M03R (Storage Tank – Horizontal, Cylindrical Tank).......................................................175

A.35 STO-M04R (Storage Tank – Vertical, Cylindrical Tank)...........................................................177

A.37 VEN-M01R (Cold Vent).............................................................................................................180

Appendix B – Lease Operation Calculator Descriptions ....................................................................181

B.1 DIE-M02R-LO (Diesel Engines Where Max HP < 600) ............................................................181

B.2 DIE-M03R-LO (Diesel Engines Where Max HP >= 600)..........................................................182

B.3 DIE-M03R-DO (Crude Oil Production Well Drilling – Diesel Engine) .......................................183

B.4 DIE-M03R-DG (Natural Gas Production Well Drilling – Diesel Engine) ...................................183

B.5 C1C2-DRILL-LO (Self-Propelled C1/C2 Vessel – US Flagged) ...............................................185

B.6 C1C2-DRILL-LO-F (Self-Propelled C1/C2 Vessel – Foreign Flagged).....................................186

Appendix C – Revision History..............................................................................................................187
OCS AQS Operator User Manual v.1.9

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List of Figures

Figure 1. OCS AQS login screen ..................................................................................................................2

Figure 2. Main login.gov page.......................................................................................................................3

Figure 3. Main dashboard after login ............................................................................................................4

Figure 4. Window and table tools..................................................................................................................6

Figure 5. Help buttons...................................................................................................................................7

Figure 6. View Full Help................................................................................................................................7

Figure 7. Technical support link ....................................................................................................................8

Figure 8. Inventory configuration page .........................................................................................................9

Figure 9. OCS AQS function map for operators .........................................................................................11

Figure 10. Dashboard module map showing panels available to operators...............................................13

Figure 11. Main dashboard for operators....................................................................................................14

Figure 12. Operator Submittal dashboard...................................................................................................16

Figure 13. Submittal Actions button............................................................................................................16

Figure 14. Source Submittal available actions............................................................................................17

Figure 15. Run QA/QC check .....................................................................................................................18

Figure 16. Download the facility QA/QC report...........................................................................................18

Figure 17. Sample QA/QC file report..........................................................................................................19

Figure 18. Go to new tab.............................................................................................................................19

Figure 19. Facility submit ............................................................................................................................20

Figure 20. Emissions main page functions .................................................................................................21

Figure 21. Emission source workflow using the Activity & Emissions Manager (AEM)..............................21

Figure 22. Selecting a facility in the AEM ...................................................................................................22

Figure 23. Default view of the AEM Details page .......................................................................................23

Figure 24. Production data..........................................................................................................................25

Figure 25. Sales Gas Components page....................................................................................................26

Figure 26. Import Amine & Glycol Emissions options.................................................................................27

Figure 27. Amine Import..............................................................................................................................28

Figure 28. Facility details link location ........................................................................................................29

Figure 29. Measuring references for structure parameters ........................................................................30

Figure 30 View Process details...................................................................................................................31

Figure 31. View Emission Unit details.........................................................................................................31

Figure 32. Copy Emission Unit ...................................................................................................................34

Figure 33. Facility-Wide Zero Emissions window .......................................................................................35

Figure 34. Set Facility-Wide Zero Emissions..............................................................................................36

Figure 35. Facility-Wide Zero Emissions for all months..............................................................................37

Figure 36. Release Point options................................................................................................................38

Figure 37. Geometry of a Fugitive release point.........................................................................................39

Figure 38. Set coordinates from facility.......................................................................................................40

Figure 39. Delete a release point................................................................................................................41

Figure 40. Process reassignment to a release point ..................................................................................42

Figure 41. Data Request tab.......................................................................................................................44

Figure 42. View field value range................................................................................................................45

Figure 43. Control Requests tab .................................................................................................................45
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Figure 44. Describe "Other" type of control equipment ..............................................................................46

Figure 45. Emission Factors tab .................................................................................................................47

Figure 46. Import/Export Activity Data selection.........................................................................................48

Figure 47. Export Activity Data – Queue and Download pages..................................................................49

Figure 48. Export summary sheet...............................................................................................................50

Figure 49. Data request sheet ....................................................................................................................50

Figure 50. Control request sheet ................................................................................................................51

Figure 51. Import Activity Data – Queue and Download pages..................................................................52

Figure 52. Example of import log with errors ..............................................................................................52

Figure 53. Month selection controls ............................................................................................................53

Figure 54. Example QA/QC report for emission source .............................................................................54

Figure 55. Options selection for Zero Emissions ........................................................................................54

Figure 56. Emission Unit Zero Emissions ...................................................................................................55

Figure 57. Options selection for Copy Monthly Data ..................................................................................56

Figure 58. Example to copy data to months ...............................................................................................56

Figure 59. Calculate/Re-Calculate options .................................................................................................57

Figure 60. Table showing calculated monthly emissions............................................................................58

Figure 61. GWP Details button ...................................................................................................................58

Figure 62. GWP Set Details........................................................................................................................59

Figure 63. Flare release point parameters..................................................................................................60

Figure 64. Documentation filtered by facility...............................................................................................61

Figure 65: Unfiltered documentation list .....................................................................................................61

Figure 66. Batch Emissions Calculator (BEC) summary page ...................................................................62

Figure 67. BEC Job Queue.........................................................................................................................63

Figure 68. Company information page........................................................................................................64

Figure 69. Company Contacts panel ..........................................................................................................66

Figure 70. Complex Details page................................................................................................................67

Figure 71. Remove unassigned release points ..........................................................................................69

Figure 72. Lease Operations map ..............................................................................................................70

Figure 73. Summary of lease operations emissions...................................................................................70

Figure 74. Leases page and selecting BOEM lease number .....................................................................71

Figure 75. Add Lease page.........................................................................................................................72

Figure 76. Lease operations and processes...............................................................................................74

Figure 77. Source selection ........................................................................................................................74

Figure 78. Edit Lease Source .....................................................................................................................75

Figure 79. Lease Source location ...............................................................................................................76

Figure 80. Add NPLO Process button.........................................................................................................77

Figure 81. Add lease operation process .....................................................................................................77

Figure 82. Delete lease operation process .................................................................................................78

Figure 83. Lease Operations Data Request tab .........................................................................................79

Figure 84. Lease Sources Calculated Emissions .......................................................................................80

Figure 85. Other Emissions module functions ............................................................................................81

Figure 86. Facility Activity Data queue........................................................................................................81

Figure 87. Activity Data download link ........................................................................................................82
OCS AQS Operator User Manual v.1.9

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Figure 88. e-GGRT report export................................................................................................................82

Figure 89. Facility e-GGRT Export queue...................................................................................................83

Figure 90. e-GGRT report download link ....................................................................................................83

Figure 91. Metadata report page ................................................................................................................84

Figure 92. Metadata export queue..............................................................................................................84

Figure 93: Public Documents list ................................................................................................................85

Figure 94. Documents in a set ....................................................................................................................85

Figure 95. Document viewer.......................................................................................................................86

Figure 96. Documents – My Documents.....................................................................................................86

Figure 97. My Documents list .....................................................................................................................87

Figure 98. Map features..............................................................................................................................88

Figure 99. Map general view.......................................................................................................................90

Figure 100. Layer Control ...........................................................................................................................90

Figure 101. Display shapefile......................................................................................................................91

Figure 102. OPD Area shapefile displayed.................................................................................................91

Figure 103. Using the Search Tool in Maps................................................................................................92

Figure 104. Map with gridded emissions ....................................................................................................93

Figure 105. Select tool information .............................................................................................................94

Figure 106. Report with download formats options ....................................................................................95

Figure 107. Permalink location ...................................................................................................................97

Figure 108. Permalink window....................................................................................................................97

Figure 109. User Options page...................................................................................................................98

Figure 110. Inventory Configuration............................................................................................................98

Figure 111. User Notifications.....................................................................................................................99

Figure 112. Notification Settings ...............................................................................................................100

Figure 113. Auditing navicons...................................................................................................................100

Figure 114. Change History report............................................................................................................101

Figure 115. Change details.......................................................................................................................102

List of Tables

Table 1. Available platform calculator types ...............................................................................................33

Table 2. Edit company details.....................................................................................................................65

Table 3. Edit complex details ......................................................................................................................67

Table 4. Processes created based on operation source type.....................................................................73

Table 5. Sources for lease operations ........................................................................................................75

Table 6. Viewer Toolbar tools .....................................................................................................................89

Table C-1. Revision history.......................................................................................................................187
OCS AQS Operator User Manual v.1.9

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List of Acronyms and Abbreviations

Short Form Long Form

AEM Activity & Emissions Manager

BEC Batch Emissions Calculator

BOEM Bureau of Ocean Energy Management

BSEE Bureau of Safety and Environmental Enforcement

CO carbon monoxide

CO2 carbon dioxide

CO2e carbon dioxide equivalent

CSV Construction Support Vessel

DOI Department of the Interior

e-GGRT electronic Greenhouse Gas Reporting Tool

FAQ Frequently Asked Questions

GHG greenhouse gas

GOADS Gulfwide Offshore Activities Data System

GWP Global Warming Potential

IPCC Intergovernmental Panel on Climate Change

LDAR Leak Detection And Repair

MSL mean sea level

NOx nitrogen oxide

NPLO non-point lease operations

OCS AQS Outer Continental Shelf Air Quality System

OPD Official Protraction Diagram

PM2.5 fine particulate matter

PM10 coarse particulate matter

QA Quality Assurance

QC Quality Control

SOx sulfur oxide

USEPA U.S. Environmental Protection Agency

VOC volatile organic compounds
OCS AQS Operator User Manual v.1.9

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Units of Measure

Units Description

% Percent

bbl U.S. barrel (42 gallons)

Btu British thermal unit 

days 24-hour period

deg F degree(s) Fahrenheit

ft foot/feet

hp horsepower

hr hour(s)

kW kilowatt(s)

lb pound(s)

lb xx/lb fraction of xx in total weight

MMBtu million Btus

mol mole(s)

month calendar month

Mscf thousand standard cubic feet

ppm parts per million

ppmv parts per million volume

psia pounds per square inch, atmosphere

psig pounds per square inch, gauge

scf standard cubic feet

wt% percent of total weight

year calendar year
OCS AQS Operator User Manual v.1.9

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1 Getting Started with OCS AQS

The Outer Continental Shelf Air Quality System (OCS AQS) is a comprehensive web-based software 

solution for managing and reporting OCS emission source data in the Gulf of Mexico and Alaska regions, 

including inputting activity data, calculating emissions, performing quality assurance and control, and 

submitting the emissions results. OCS AQS provides an intuitive user interface to facilitate the 

participation by the offshore operators in the annual survey program mandated by the Bureau of Ocean 

Energy Management (BOEM).

1.1 About this Document

This user manual was prepared to assist the operators in their use of OCS AQS to complete the 2021 OCS 

Emissions Inventory in compliance with 30 CFR 550.303(k) and 550.304(g). As OCS AQS is a web 

solution that supports regular updates, the user manual will serve as a living document which will be 

updated periodically to reflect software updates to OCS AQS. 

IMPORTANT: This document is for operators ONLY. While officials at BOEM have access to a 

broader range of functionality, it is not described here.

Please note that OCS AQS replaces the legacy Gulfwide Offshore Activities Data System (GOADS) but

includes the same required data input fields. Key differences between OCS AQS and GOADS include the 

following:

• OCS AQS is a web-based system that can be accessed from a web browser and does not require a 

separate software installation.

• OCS AQS has dashboards, reports, and mapping features to provide user-friendly and contentrich interface.

• OCS AQS includes historical emissions inventories (2000, 2005, 2008, 2011, 2014, and 2017) for 

reference and review by operators and lessees.

1.2 Supported Browsers

OCS AQS can be accessed by authorized users from any computer with an internet connection. OCS 

AQS supports most major browsers including: 

• Microsoft EdgeTM

• Mozilla FirefoxTM

• Google ChromeTM

Other browsers may run OCS AQS without significant issues, but they are not explicitly supported. 

IMPORTANT: OCS AQS does not support Microsoft Internet ExplorerTM.
OCS AQS Operator User Manual v.1.9

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1.3 Accessing OCS AQS

To gain access OCS AQS, complete the following steps:

1. BOEM or the Bureau of Safety and Environmental Enforcement (BSEE) will send an invitation 

email with instructions on how to access OCS AQS. If you are an operator (or authorized 

consultant) and did not receive an email, please send an account request to 

ocs.aqs_support@weblakes.com.

2. If you did receive the invitation email, follow the instructions, including the requirement to create 

a login.gov account. When setting up your login.gov account, you must use the same email 

address in which you received the OCS AQS invitation. If you would like to use a different email 

address, please send your request to ocs.aqs_support@weblakes.com.

3. In certain cases, the OCS AQS Systems Administrator may require 24 hours to complete the 

account setup process, so please keep this in mind the first time you log into the system.

1.4 Logging in the First Time

Go to https://ocsaqs.doi.gov.

You should see a login screen similar to Figure 1. Click Continue.

Figure 1. OCS AQS login screen

Click Operators, and this will take you to the login.gov screen as shown in Figure 2. Enter your 

login.gov credentials and click Sign in.
OCS AQS Operator User Manual v.1.9

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Figure 2. Main login.gov page

If this is your first time accessing OCS AQS through login.gov, depending on the two-factor 

authentication option you selected when you created your login.gov account, you will be prompted with 

additional instructions. For example, if you elected to use text messaging, login.gov will send a code to 

the phone you specified with instruction on how to enter the code to complete the two-factor 

authentication process. If you run into any problems with login.gov, please contact login.gov technical 

support.

After you have successfully logged in, your initial landing page (and home page) is the Dashboard 

module, similar to the one shown in Figure 3 below. 
OCS AQS Operator User Manual v.1.9

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Figure 3. Main dashboard after login

The number of different dashboards available to you in the Navigation Panel may vary depending on 

assigned access rights, and the displayed data may vary due to the default inventory in your account.

1.5 System Security

1.5.1 Automatic Logout

Due to the U. S. Department of the Interior (DOI) security requirements, if you do not use the system for 

more than 15 minutes, you will be automatically logged out, and you will have to log back in again. You 

will be given a one-minute warning prior to the automatic logout, during which you can refresh your 

session and prevent the automatic end-of-session.

IMPORTANT: If you are logged out while in Edit mode, any unsaved changes will be lost. 

1.5.2 Password Recovery

If you forget your password, simply click Forgot your password? (as shown toward the bottom of 

Figure 2), and follow the instructions provided.

1.6 Navigating the System

1.6.1 Overview

After you log in, you will see a screen similar to Figure 4 shown below. Although the content of each 

screen will vary based on available level of access and the location within the application, the main 

navigation tools are always located in the same area for easy reference. For the current submittal year, 
OCS AQS Operator User Manual v.1.9

5

users will only have access to their specific inventories and facilities. Users have access to all facilities for 

past, final inventories that are publicly available, and these inventories are locked.

IMPORTANT: The Dashboards and Map modules do not have navicons but a custom interface 

(explained in corresponding sections).

The main navigation tools are as follows (Figure 4):

Figure 4. Example home screen

1. Module Tabs: These tabs provide access to the OCS AQS modules (see next section for a 

description of each module). The module you are in is underscored by a blue line. 

2. Breadcrumbs: This link shows your current location within the web hierarchy and thus provides 

contextual information to the current page. Clicking on any text will take you to that particular 

page. Clicking on Home takes you back to the first page you see after login.

3. Navigation Panel: These folders provide navigation options for a given module and the steps you 

are taking. For pages other than the Dashboard, there will be Navicons to access different pages 

and wizards.

4. Navicons: Icons and headings that represent sections and tools included in each section.

5. Notification Indicator: This icon shows if you have system messages related to OCS AQS 

operations.

6. User ID: Displays the ID of the user currently using the application. Clicking the user ID or the 

down arrow beside it allows you to log out of the system. 

7. Help: Click to load context-sensitive help for the current page.

8. Inventory Selector: This tool is used to select the emissions inventory that you will be working 

in. Depending on your user rights, your access may be limited to a single inventory. Past 

inventories (2017, 2014, etc.) will be locked ( ) and available for review only.

1.6.2 Using Windows and Tables

Detailed data in OCS AQS is organized and presented using windows and tables. An example of a table 

that lists emission units for platform sources (to be covered later) is shown in Figure 5. A number of tools 

are available to navigate, search, manipulate, and export the information in the tables. These tools are 

identified in Figure 4 and described below. 
OCS AQS Operator User Manual v.1.9

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Figure 4. Window and table tools

1. The Search Tool in the upper left of the window allows you enter keywords to find specific 

records. Keywords can include partial spellings like “pneu” for “pneumatic” and are not case 

sensitive. The search button ( ) executes the search and the cleanup button ( ) removes all 

text in the search bar.

a. Advanced Search ( ) allows you to search the table by utilizing multiple keywords 

for the different categories in any given table. Categories can include items such as 

Emission Unit ID, Equipment Type, and Unit Type Code for the Emission Units table.

This type of search is not available in every table.

2. Available Records in the lower left corner of the window shows the number of records available 

in the table.

3. Page Controls in the lower center of the window allow you to navigate the table page by page, 

jump directly to a specific page, and control the number of rows displayed per page using the 

drop-down menu.

4. Data Tools in the lower right of the window allow you to perform a more customized search ( )

and reload the table after the query ( ). The export icon (up arrow) allows the user to export the 

table’s records in Excel or CSV format. The table can also be printed from this icon.

1.6.3 Panel Controls

The OCS AQS interface uses data panels to organize information and for ease of navigation. Each panel, 

depending on context, will have one or more of the following controls:

 Click to access panel/dialog-specific help.

/ Collapse/expand the panel. Collapsing a panel will hide the panel content, leaving only the 

panel header and reducing the amount of space it occupies. Recommended for smaller screens.

 Maximize panel. Maximizing the panel will stretch it to fit the entirety of the available screen 

space. Recommended when viewing content-heavy panels (e.g., dashboards) on a small 

screen.
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1.6.4 Getting Help

OCS AQS is designed to be easy to use and intuitive. Additional tools are provided to assist you:

• Online Help: Press the icon on the top right-hand corner of any page to go to a help section 

for the page or the button in the top right corner of a data panel (if available) as seen in 

Figure 6.

Figure 5. Help buttons

• Full Help: In the Online Help window, click View Full Help as seen in Figure 7. This will 

provide a searchable help feature.

Figure 6. View Full Help

• User Manual (this document): The user manual provides in-depth assistance with easy-to-follow 

examples and indexed content.

• OCS AQS support team: For help not covered above, contact tech support for OCS AQS at 

ocs.aqs_support@weblakes.com.

Technical support is available by clicking on the OCS AQS Technical Support link in the bottom part of

the screen after you log in as shown in Figure 8. Clicking on the link opens up the OCS AQS Technical 

Support page that gives contact information for both technical support and BOEM inquiry email address

(OCSEmissionsInventory@boem.gov).
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Figure 7. Technical support link 

IMPORTANT: When requesting technical support, please let us know which web browser you 

are using so that we can tailor our response to your requirements. Each browser displays content 

slightly differently. 

1.7 Selecting Inventories

The selected emissions inventory determines the year and emissions scenario you will be working with. It 

is therefore extremely important to make sure you select the correct inventory before you begin working. 

By default, upon the initial login users will automatically be directed to the most recent inventory, which 

currently is the 2021 inventory. If you have questions, contact your OCS AQS representative at 

OCSEmissionsInventory@boem.gov to determine which inventory you should be using.

Operators also are able to switch between inventories and select historical inventories. To change or select 

a specific inventory, click on Inventory Selector (as described in Section 1.6.1). This will take you to the 

Inventory Configuration page (as described in Section 9.1.1). Click on the desired inventory name. The 

name of the selected inventory should appear in the Inventory Selector area, similar to the example

shown in Figure 9. In some cases, when you initially log in, there may be only one inventory.
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Figure 8. Inventory configuration page

Use the Module Tabs or Breadcrumbs to navigate to other pages. 

1.8 OCS AQS Modules

OCS AQS has several modules that group functionalities for easy navigation. Switch between the 

modules by clicking on the Module Tabs as shown previously in Figure 4. The available modules are:

• Dashboards: This module presents a snapshot of activities based on your access rights. The 

Navigation Panel has several options you can choose from. You can customize what data is 

displayed on some dashboards the Settings button located in the upper right corner of the page.

• Emissions: This module provides all the resources you will need to add and update emission 

sources and pollutant totals.

• Documents: This module contains supplemental documentation—such as user guide and course 

materials—and allows you to review or download any file uploaded/downloaded/generated by the 

system.

• Map: This module provides an interactive GIS style map with different layers for sources, 

emissions, and shapefiles. Sources are linked to pages in the Emissions module for easy 

reference.

• Reports: OCS AQS comes with several prepared reports ready to use. Each report has its own 

wizard to guide you through criteria selection to help create a report specific to your 

requirements.

• Settings: This module allows you to review your activity in the system as well as access the 

inventory list.
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1.9 OCS AQS Definitions

OCS AQS uses the same nomenclature as GOADS in reference to hierarchies and definitions. The 

following terms are used throughout this manual:

• Company refers to the organization or legal entity that owns and operates assets and has the 

requirement and responsibility to submit the OCS Emissions Inventory.

• Lease refers to the legal agreement between the company and BOEM to operate in a specified 

manner and location.

• Lease Operations refer to specific activities taken by the Lessee as part of the Lease. Lease 

operations include platform sources; however, for OCS AQS, lease operations refer only to 

drilling operations in which the drilling rig is connected to the sea bed, and well stimulation and 

installation support vessels installing new platforms or pipelines.

• Complex refers to a group of related structures within a lease area that is assigned a BOEM 

Complex ID. 

• Facility refers to an individual structure (Complex-Structure Number). A single facility or 

multiple facilities can make up a complex.

• Emission Source refers to a process or piece of equipment on a facility that generates air 

emissions and releases it to the environment. For OCS AQS, an emission source consists of an 

emission unit and a release point. In some cases, such as fugitive emissions, the emission unit and 

the release point are the same.

• Emission Unit refers to the process or equipment type of a facility capable of generating air 

emissions. In some cases, such as fugitive emissions, the emission unit is a collection of 

components that may be located throughout a facility.

• Release Point refers to the physical properties of an emission source that release emissions into 

the environment.

• Process refers to the physical and chemical reactions that take place in an emission source and

convert throughput material into air emissions.

1.10 OCS AQS Function Map

An outline of all OCS AQS modules and functions located within the Navigation Panel selections is 

shown in Figure 10.
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Figure 9. OCS AQS function map for operators
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1.11 Layout of User Manual

The rest of the user manual is laid out in the following sections:

• Section 2 – Dashboards

• Section 3 – Emissions: Platform Sources

• Section 4 – Emissions: Lease Operations

• Section 5 – Emissions: Other Emissions Functions

• Section 6 – Documents

• Section 7 – Map

• Section 8 – Reports

• Section 9 – Settings

The Emissions module is broken into three parts in order to describe in greater detail each section within 

the module.

Each section will have a more detailed map of the functions accessed through the Navigation Panel.
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2 Dashboards

Dashboards provide a summary of key OCS AQS data using tables, maps, and graphs. There are multiple 

dashboard screens available, all accessible on the Navigation Panel as shown on the module map in

Figure 11. The specific dashboards available to you will depend on your access rights.

Figure 10. Dashboard module map showing panels available to operators

2.1 Dashboard Overview

Pathway: Dashboards

The dashboard pages share several common features:

• Graphs and visuals on the page can be changed by clicking on Settings in the top right of the 

page. Select (or deselect) the options you want to see on the dashboard page and click Save to 

apply the changes. Some pages do not have a Settings feature.

• Selecting the three bars next to a graph gives you the option to save the graph figure in .png 

or .jpg format.

• Scrolling over graphs reveals the data tables.

IMPORTANT: Information in the dashboards is arranged vertically. Scroll down to see 

additional content.
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TIP: If you do not see the data on a dashboard page that you want, check the inventory and make 

sure you are working in the right inventory year.

The available dashboards include the following:

• Main – This is the main dashboard that will be displayed when you log in. It shows the inventory 

year and includes a summary of facilities, release points, and pollutants inventoried. This 

dashboard also includes a map of the facility (or facilities) and summary graphs of selected 

pollutant emission totals. Data is organized by Official Protraction Diagram (OPD) Areas. An 

example of this dashboard is shown in Figure 12.

Figure 11. Main dashboard for operators
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• Facility Emissions: This dashboard is similar to the Main dashboard but shows a breakdown of 

emissions by facility across a region.

• Lease Emissions: This dashboard is similar to the Facility Emissions dashboard but shows a 

breakdown of emissions by lease and lease source across a region.

• Platform Emissions: This dashboard provides an overview of emissions (groups or individual 

pollutants) for each emission period aggregated by location (platform) as bar charts.

• Facility Details: This dashboard provides facility level data details as well as a list of pollutant 

totals emitted by the facility.

• Operator Submittals: This dashboard provides controls to submit the completed inventory to 

BOEM and the status of facility inventory submittals. This dashboard is discussed in greater 

detail in the next section.

• Ownership Transfers: This dashboard shows the status of facility transfers made by BOEM on 

behalf of companies that have bought/sold a facility.

• FAQs: This is not technically a dashboard but provides a collection of Frequently Asked 

Questions (FAQs) about the OCS AQS software, emissions inventories and other topics. The 

FAQs are grouped in the following categories:

o General Questions

o Emissions Calculations

o Lease Operations

o Dashboards

o Maps

o Reports

o Submittal

Some dashboard pages, especially the Main, Facility Emissions, and Lease Emissions dashboards, have 

quick links in the top row of summary information. These allow you to access the tables or reports that 

are associated with the displayed data.

2.2 Operator Submittals Dashboard

Pathway: Dashboards > Operator Submittals

Completed inventories are submitted to BOEM through the Operators Submittals dashboard. As shown 

in Figure 13, the submittal dashboard contains two sections – Submittal Status Summary and the 

Submittal Information table.
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Figure 12. Operator Submittal dashboard

1. The Submittal Status Summary displays how many sources in the current inventory year are in 

various stages of the submittal process.

2. The Submittal Information table allows you to initiate and monitor the source inventory 

submittal process.

At the top of the Submittal Information table, the following options are available to allow you to quickly 

find specific information:

• Facilities/Leases filter, which allows you to select which source type is displayed

• Search bar, which allows you to locate a specific source

• Submittal Actions (Figure 13):

o QA/QC...: Run a Quality Assurance/Quality Control (QA/QC) check. This process 

ensures that all required (i.e., mandatory) values have been specified and that the 

emissions calculations are based on the most recent data.

o Submit...: Submit the selected sources to BOEM for review. A final QA/QC check will 

be automatically performed on any source being submitted. 

Figure 13. Submittal Actions button
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The Status Information table displays the following information for each source:

• Checkbox: Check the box for any source you wish to submit or run a QA/QC check on

• Facility/Lease: Name of the structure or lease (depending on the active filter)

• QA/QC Status: Status of the QA/QC check last time it was performed will be one of the 

following:

o Uninitialized: QA/QC check has not been performed.

o Processing: QA/QC is being performed.

o Passed: QA/QC check passed successfully, source is ready to be submitted.

o Failed: QA/QC check detected issues. Click Files in the Actions column to download the 

QA/QC file and review the issues.

• Submittal Status: Current status of the source inventory in the submittal process will be one of 

the following:

o Submittal On Hold: Submittal is not available at this time.

o Submittal Available: Source can be submitted if all data is complete.

o Corrective Action: The source has been reviewed by BOEM and returned for 

corrections, or the source failed the QA/QC check during the submittal procedure.

o Processing: Temporary status while the system processes the submittal.

o Submitted: The source has been submitted to BOEM for review.

o Approved: BOEM has accepted the submitted source inventory as complete, and no 

further action on the part of the operator is required.

IMPORTANT: When all sources in the inventory are of the status Submitted or Approved, the 

inventory will be locked and cannot be edited.

• Last Action Date: Date and time when the last QA/QC or submittal action was performed

• Actions:

o Go To: Go to the Activity & Emissions Manager (for platform sources) or Lease 

Operations Emissions Manager (for lease sources) to correct any issues detected during 

QA/QC check.

o Files: Open the dialog where you can download the QA/QC file. If issues are detected 

during the check, the title of the file will begin with “QAQC_FAILED.”

o Log: Display a log of submittal actions taken for this source (Figure 14).

Figure 14. Source Submittal available actions
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2.2.1 Begin Submission Process

Pathway: Dashboards > Operator Submittals

To submit a new source inventory that has a Submittal Available status, take the following steps:

1. Check the box for the source to be submitted.

2. Click Submittal Actions and select QA/QC... (Figure 15). The QA/QC Status for the source 

will briefly display Processing... and then Failed or Passed depending on the case of the source 

you are submitting.

a. If the QA/QC Status is flagged as Passed, skip steps 3–11 below and go to step 12.

b. If the QA/QC Status is flagged as Failed, follow steps 3–12 below.

Figure 15. Run QA/QC check

3. Click Files in the Actions column for the source flagged as Failed.

4. In the Facility Submittal Files dialog, locate the file with the name that starts with 

“QAQC_FAILED.”

5. Click the file to download it to your local machine and open it (Figure 16).

Figure 16. Download the facility QA/QC report

6. In the Summary tab, see what sections are labeled as Failed.

7. Click on the hyperlink of the failed sections or go directly to the tab for more detailed information 

regarding the issues detected (Figure 17).
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Figure 17. Sample QA/QC file report

8. IMPORTANT: In the Actions column for the source, click Go To to open the Activity & 

Emissions Manager (or Lease Operations Emissions Manager for a lease source) in a new tab

(Figure 18).

Figure 18. Go to new tab

9. Correct all issues flagged by the QA/QC check.

10. Return to the Operator Submittals dashboard.

11. Re-run the QA/QC check on the source—this time it should come back as Passed.

12. Click Submittal Actions and select Submit... (Figure 19).
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Figure 19. Facility submit

After BOEM reviews the submitted data, it will be marked either Approved or Corrective 

Action, depending on the result of the review.

IMPORTANT: You can check multiple boxes to run the QA/QC check or submit multiple 

sources.

2.3 Submittal Corrective Action

BOEM will review the source inventory after it has been submitted. If there are questions regarding the 

inventory data, BOEM may send it back with comments for corrective action and resubmission.

If this happens, correct the inventory, address the comments, and re-submit using the same procedure

described above.

IMPORTANT: Though, a notification email is sent when the sources are submitted for review, 

there is no notification issued if the source is returned for Corrective Action. Please continue to 

check the Operator Submittals dashboard regularly, until all sources are marked as Approved.
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3 Emissions: Platform Sources

Pathway: Emissions > Platform Sources

Platform sources make up the majority of emission sources and pollutant emissions in OCS AQS. You 

can manage all platform sources in the Emissions module. When you select the Emissions module, you 

are automatically taken to the Emissions – Platform Sources page. The Platform Sources page provides 

links to several different options, as shown in Figure 21 with the various navicons. Navigation to other 

Emissions module functions is done using links on the Navigation Panel.

Figure 20. Emissions main page functions

3.1 Platform Sources Workflow

OCS AQS is designed to make updating and editing emission sources easy. in the Activity & Emissions 

Manager (AEM). The AEM provides a one-stop shop for all platform emission source functions. The 

basic workflow using the AEM is shown in Figure 22. 

Figure 21. Emission source workflow using the Activity & Emissions Manager (AEM)
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To implement this workflow, OCS AQS uses integrated toolsets and prepared import/export templates for 

all emission processes. 

3.2 Using the Activity & Emissions Manager

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM)

To access the AEM, click on the Activity & Emissions Manager (AEM) navicon (shown in Figure 21

above). This takes you to the list of facilities in the inventory. Select the facility to work with by clicking 

the hyperlink in the Facility ID column or clicking on View in the Actions column, as shown in Figure 

23 below. If your facility is not in the list, please contact OCS AQS support.

Figure 22. Selecting a facility in the AEM
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3.2.1 Activity & Emissions Manager Details Page

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

Selecting the facility takes you to the AEM Details page with a view similar to Figure 24. This page 

allows you to make changes in designated fields as well as perform certain other operations.

Figure 23. Default view of the AEM Details page

3.2.1.1 Main Features of AEM Details Page

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

The AEM Details page has a number of features that can be seen by scrolling down the page. These 

features and their use will be described in detail in the sections that follow.

First, in the upper right part of the page, there are buttons to update annual Production and throughput 

values and Sales Gas composition for the selected facility. Below them, you can see the Emission Units 

& Processes section, which shows the different emission units and their associated processes within the 

facility in tabular form, and includes buttons to Add Emission Unit, Activity Data Options (which 

allows you to import and export activity data for the selected process), and Facility-Wide Zero 

Emissions. 
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The second section encompasses the Process section, which includes the following sections:

• Calculator Parameters & Requests: Provides the activity data entry for emission calculation 

parameters and associated metadata for individual sources. This will be described in greater detail 

below.

• Release Point & Apportionment: View and update release point parameters associated with an 

emission source or delete release points that are no longer in use.

• Calculated Emissions: Shows the calculated emissions for an emission unit for the entire year by 

month based on calculator parameters provided in the Process feature.

• Attached Files: Contains emission rate source files for the amine and glycol units.

IMPORTANT: The Attached Files panel only becomes available after a data file has been 

imported.

• Tags: View and update keywords related to the process.

• Trade Secrets: View, update, or request a “trade secret” designation.

• Data Entry QA and Log: Shows when updates were made and by whom.

3.2.1.2 Edit Mode

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

It is important to note that you will automatically be in Edit mode when you enter the AEM Details page.

You can confirm this if you are able to edit or otherwise make changes to fields in the Process section. 

TIP: If you are not in Edit mode and cannot load it by clicking Edit, check to make sure that your 

inventory is not locked; a locked inventory would have the displayed in front of the inventory 

name. A locked inventory icon appears in the Inventory Selector as follows: 

If you are not in Edit mode, the data will be read-only, and many options and buttons will not be 

available. You can exit Edit mode by clicking either Save or Cancel under the Emission Units & 

Processes panel. 

To save data, click on Save in the upper right corner of the Process section. This will update the Process

section and hide several buttons and selectors. To return to Edit mode, highlight the desired Emission 

Unit in the table at the top of the screen and click on Edit where Save used to be.

IMPORTANT: If you do not save your work, it will be lost if you navigate away or are 

automatically logged off.

3.2.2 Updating Annual Production Rate and Sales Gas Composition

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

3.2.2.1 Annual Production Rates

Production rates can be updated by clicking on Production in the upper right corner. This will open a 

window with fields for annual production, throughput, and usage. To edit the values, click on Edit in the 

top or bottom right corner as shown in Figure 25. Be aware that input fields are for specific energy type 

(crude oil, natural gas, and diesel) based on the units and field descriptions. All values must be greater 

than or equal to 0.
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Figure 24. Production data

Click Save to save updates and get out of Edit mode. Click Close to close the window.

3.2.2.2 Sales Gas Composition

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

Update sales gas composition by clicking on Sales Gas and Edit, similar to the procedure described 

above for Production. 

The input fields for the different mole fraction components will automatically sum in the lower right box 

(Sales Gas Total [mole%]). If the final sum does not equal 100%, you can normalize the value clicking 

on the Normalize button that will appear in the upper right corner of the window. Normalize will add or 

subtract from the non-zero elements in the fields by a linear weighting method that allows the composite 

total to sum exactly to 100.00%. If the sum is equal to 100.00%, the Normalize button will not appear.

An example of the Sales Gas update screen with a sum not equal to 100.00% is shown in Figure 26. 
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Figure 25. Sales Gas Components page

3.2.3 Importing Amine & Glycol Emissions

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

Emissions for amine and glycol processes are calculated based on the emission rates generated by

AMINECalc©1and GRI-GLYCalcTM,

2

respectively. These values can be imported as emission factors for 

any relevant process directly in AEM. The emissions can then be calculated using these emission factors 

and the operating hours for each month.

To import the emission rates, follow these steps:

IMPORTANT: You can only import amine emission factors for amine gas sweetening units and 

glycol emission factors for glycol dehydrator units.

1. In the Emission Units & Processes table, locate and select the amine unit (with calculator type 

AMI-000) or the glycol unit (with calculator type GLY-000) for which you wish to import data.

2. An Import Amine Emission Rates or Import Glycol Emission Rates button will become 

available in the Calculator Parameters & Requests panel, depending on your selection. Click 

this button (Figure 26).

1 API PUBL 4679 Amine Unit Emissions Model AMINECalc Version 1.0

2 www.gastechnology.org
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Figure 26. Import Amine & Glycol Emissions options

3. Click Yes in the message confirming that your any unsaved work will be saved.

4. Click Select file. 

5. Navigate to and select the file that contains the data. Click Next.

6. Check the box for each Stream you wish to import. If a stream you are looking for is not 

available, the data file may be corrupted. Click Next.

7. Select the Emission Periods for which emissions will be imported. You can only select an 

emission period if:

• The Hours of Operation have been specified in the Data Request tab of the Calculator 

Parameters & Requests panel, and

• The period has not been set to Zero Emissions

8. Click Next.

9. Review the summary of the selections made. If all information is correct, click Finish to 

complete the import.

The imported emission rates values will be displayed in the Emission Factors tab of the Calculator 

Parameters & Requests. After the page is refreshed, the file will be displayed in the Attached Files

panel (as seen in Figure 28). From here, you can download the file by clicking on the file name link in the 

Download column or view its contents by clicking the View option in the Actions column.

After the emission rates have been imported, the emissions can be calculated as they would be for any 

other process by clicking Calculate in the Calculated Emissions panel (for more details see Section 

3.2.12).
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Figure 27. Amine Import
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3.2.4 Updating Facility Details

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

To check structure details such as design specifics, sales gas composition, and location click on the 

Facility name hyperlink above the Emission Units & Processes table as shown in Figure 29. A window 

will pop up with facility details. Scroll down to review available facility details.

Figure 28. Facility details link location

To edit information about the facility, click Edit in the top or bottom right corner of the window to enter 

the edit mode. Click Save to complete the updates.

IMPORTANT: Fields colored in green are required, and you will not be able to save any changes 

if any of the green fields are blank.

Production Rates and Sales Gas Composition can be edited in this window, as well as the individual 

windows described in Sections 3.2.2.1 and 3.2.2.2 respectively.

3.2.4.1 Structure Details

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility > View Facility 

Details

The Facility Details page allows you to enter physical parameters associated with the platform structure, 

including:

• Platform Base Height Above MSL

• Platform X Length

• Platform Y Length

• Platform Angle

• Maximum Height of the Buildings
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Platform base height should be measured from MSL to the topmost layer where emission sources will be 

located. Maximum building height should be the top of the highest enclosed structure measured from 

MSL. Fixtures mounted on the building such as satellite dishes, cranes or other open frames should not be 

considered part of the building for measurement purposes. Measurement references are shown in

Figure 30.

Figure 29. Measuring references for structure parameters

Platform X Length should be the dimension closest to the east-west orientation and Platform Y Length

should be the dimension closest to the north-south axis. 

The Platform Angle is the offset angle of the platform from true north.

3.2.5 Emission Units & Processes

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

The Emissions Units & Processes table includes all emission units and a summary of key information 

including

• Process ID and description of each emission unit

• Source Classification Code (SCC)

• Assigned calculator

• Date and time of the last emission calculation (if applicable)

3.2.5.1 Select Emission Unit

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

Emission units associated with a particular facility are shown in the table at the top of the AEM Details

page. To view the details of any emission unit process, click anywhere in the row for that emission unit

other than the hyperlinks to select it, as shown in Figure 31. This will update the Process section under 

the table. Clicking on the View or Edit in the Actions column will open the Details of Emission Unit

window for viewing emission unit information.
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Figure 30 View Process details

3.2.5.2 View/Edit an Emission Unit

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

To view the details of an emission unit, click View in the Actions column (Figure 31). Edit the emission 

unit by selecting Edit in the Actions column. Green fields represent required data that must be included 

before you can save the item. Click Save to save changes.

Figure 31. View Emission Unit details
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3.2.5.3 Add an Emission Unit

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

Adding a new emission unit will also create the associated process and automatically assign an 

appropriate calculator based on a template. 

To add a new emission unit:

1. Click Add Emission Unit above the Emission Units & Processes table. A wizard will begin,

starting with Emission Unit Template Selection. 

The table on this page lists all emission unit types for which templates have been created. A 

template will determine what process is created for the new emission unit and the emissions 

calculator that will be assigned to that process based on the emission unit type and description.

2. Select the template that best fits the emission unit you wish to create. 

3. Click Next.

4. Fill out the necessary data (fields colored in green) for the emissions unit. You may need to scroll 

down to reach all necessary fields. 

5. Click Next.

6. The next step allows you to specify a release point for the new emission unit. You MUST define 

a release point before you can calculate emissions, but you do not have to do it to finish the 

wizard. There are three options you can use:

a. Use an Existing Release Point. If you check this option, select a release point from the 

list of ones already defined for the structure and click Next.

b. Create a New Release Point. If you check this option, enter all required parameters 

(green fields) and click Next.

TIP: To be created, a release point must be properly georeferenced. If you do not know 

the exact coordinates of the release point, click From Facility Location in the 

Georeference panel to assign the release point the same coordinates as the structure.

c. Skip Release Point. You can finish the wizard without creating a release point, but you 

will not be able to calculate emissions for the new emission unit until you specify a point 

of release for it. Click Next.

7. Review selected options and click Finish to create the new release unit.

The new unit will be available for selection from the Emission Units & Processes table, and the assigned

release point (if this was done during the procedure) will be displayed in the Release Point & 

Apportionment panel.

When you create an emission unit, the associated process will have the appropriate calculator assigned 

based on the template defined by BOEM. Calculators have been prepared for the following processes 

found on platforms, as shown in Table 1.

A description of each calculator and Data Request and Control Request input fields is provided in 

Appendix A.
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Table 1. Available platform calculator types

Code Description

AMI Amine gas sweetening unit

BOI Boilers

DIE Diesel and gasoline engines

DRI Drilling equipment

FLA Flares

FUG Fugitive emissions

GLY Glycol dehydrators

LOA Loading operation emissions

LOS Losses from flashing

MUD Mud degassing

NGE Natural gas engines

NGT Natural gas/diesel dual-fuel turbines

PNE Pneumatic pumps

PRE Pneumatic controllers

STO Storage tanks

VEN Cold vents
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3.2.5.4 Copy an Emission Unit

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

To copy an emission unit, select the click Copy under the Actions column, and a short wizard will guide 

you through the process. The fields will all copy from the original emission unit; however, you are 

required to change the Emission Unit ID, as shown in Figure 33. Click Next to move to the next step. 

The summary step allows you to review the specified information. Click Finish to create the new 

emission unit.

Figure 32. Copy Emission Unit

3.2.5.5 Bulk Import/Export

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

Parameters required to calculate emissions produced by various units can be easily reviewed and updated 

by exporting them into an Excel spreadsheet and then importing them back into OCS AQS. This is done 

by clicking on Activity Data Options above the table of the Emission Units & Processes and is 

described below in Section 3.2.9.1.

3.2.5.6 Facility-Wide Zero Emissions

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

If no emissions are generated for the entire facility for a specific month (or months) due to inactivity, 

maintenance, or natural disaster, you can zero out emissions for all sources by month without updating 

each unit individually. 
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Click Facility-Wide Zero Emissions above the Emission Units & Processes table to load the FacilityWide Zero Emissions dialog as shown in Figure 34. 

Figure 33. Facility-Wide Zero Emissions window

Check the box for the month (or months) of zero emissions that took place for the entire facility and click 

[...] to load the list of reasons why the facility did not produce emissions. Select the appropriate reason 

and click OK. Repeat the procedure for all months the facility has been idle. Click Save to commit the 

changes. A verification message allows you to confirm the selection. Figure 35 illustrates the process.
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Figure 34. Set Facility-Wide Zero Emissions

IMPORTANT: If you need to show zero emissions for a particular emission unit, you can do that 

in the Calculator Parameters & Request section as described in Section 3.2.10.
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If the facility has not been producing for the entire year (decommissioned, sold, etc.), you can select all 

months at the same time by clicking Check All; set the same reason by selecting it in the selection at the 

top of the dialog and click Apply as seen in Figure 36. After you commit the changes, all processes will 

be set to zero emissions for all months.

Figure 35. Facility-Wide Zero Emissions for all months

IMPORTANT: This procedure sets the emissions for all processes and emissions periods for this 

facility to 0 and deactivates data entry for the Calculator Parameters & Requests panel. If you 

then reactivate a specific process for a specific month, the Facility-Wide Zero Emissions setting 

for that month will be removed, but the other processes at the facility will still be set to zero 

emissions for that month.

3.2.6 Decommissioned Facilities

If a facility is listed in the 2017 inventory but is not being used or was decommissioned before the 2021 

reporting period, it will still show up in the 2021 inventory. Zero out the facility with the appropriate 

reason. 

3.2.7 Release Point & Apportionment

Release points are used to designate where emissions transfer from a process into the atmosphere and are 

required for source characterization. All elevations for release points are measured from mean sea level

(MSL).

Apportionment refers to the amount of emissions generated by a process that is sent to an individual 

release point. In OCS AQS, all apportionments are assumed to be 100%, meaning that all emissions from 

an emission unit goes to one release point.

IMPORTANT: Emissions will not be calculated for any emission unit that is not connected to a 

release point. Make sure that a release point is specified before calculating emissions.
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3.2.7.1 Assign Release Point to an Emission Unit

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

To assign a release point to an emission unit, perform the following steps (Figure 36):

1. Select the emission unit you want to assign by choosing it in the Emissions Unit & Processes

table.

2. Scroll down to the Release Point & Apportionment panel.

3. To create a new release point for the emission unit, click New Release Point and fill in the 

required information (see Section 3.2.7.4).

4. To select an existing release point, click the [...] to the right of the field and select a release point 

from the list of available ones (see Section 3.2.7.2).

5. If needed, after a release point is specified, you can edit its information by clicking Details/Edit

(see Section 3.2.7.3).

6. As required, you can delete and deselect a no longer existing release point by clicking on Delete 

Release Point (see Section 3.2.7.5)

Figure 36. Release Point options

3.2.7.2 Select an Existing Release Point

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

If a release point that the emission unit vents to already exists, you can select it as follows:

1. Click [...] to the right of the field.

2. Highlight the release point you wish to use.

3. Click Select.

The release point ID will now appear in the Release Point field.

3.2.7.3 Edit a Release Point

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

When a release point is selected, a Details/Edit button will appear. Click this button to view details about 

the selected release point. You can edit the release point by clicking Edit at the top or bottom of the 

screen.
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3.2.7.4 Create New Release Point

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

To create a new release point:

1. Click New Release Point.

2. The Add Release Point window will open.

3. Complete the required information in green fields. You may need to scroll down to access all data 

panels.

Some required data depends on the Release Type you select:

• For all types except Fugitive, the following parameters are required:

• Stack Height in ft

• Stack Diameter in ft

• Exit Temperature in deg F

• Exit Velocity in ft/s 

• Flow Rate in ft3/s

TIP: You only need to enter two parameters of the Stack Diameter, Exit Velocity, and Flow 

Rate. The remaining value can be calculated by pressing the button on the right side of the 

field using the following relationship:

Vs = 4V/πd

2

where:

Vs is Exit Velocity

V is Flow Rate

d is Stack Diameter

• If the stack type is a Fugitive, the following parameters are required:

• Release Height in ft

• Type of the fugitive release

• Length of X side (closest to east-west axis) in ft

• Length of Y side (closest to north-south axis) in ft

• Orientation Angle in degrees from true north

The geometry of the fugitive release point is shown in Figure 38.

Figure 37. Geometry of a Fugitive release point
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4. In the Georeference section, you can use latitude/longitude coordinates in decimal degrees 

instead of Universal Transverse Mercator (UTM) coordinates. OCS AQS automatically converts

one coordinate system to the other.

5. You MUST specify the coordinates for the release point. If you do not know the coordinates of 

the release point, From Facility Location fills in the coordinates with default facility value, as 

shown in Figure 39. You can update these coordinates at any point, should the exact coordinates 

become available.

Figure 38. Set coordinates from facility

6. Click Save to save the release point information.

Though not required, it is recommended to provide a release point description to make it easier to 

identify.
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3.2.7.5 Delete Release Point

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

If you wish to delete from the database a selected release point that no longer exists (or another release 

point in the selected facility) (Figure 39):

1. Click Delete Release Point

2. Use the radio buttons above the list to filter the table to display:

o All: All release point regardless of their assignment status

o Assigned: All release points that are assigned to a process

o Unassigned: All release points that are not assigned to a process

3. Select the release point you wish to delete from the list of available ones

4. Click Next

Figure 39. Delete a release point

IMPORTANT: Every process in the inventory must be assigned to a release point to calculate 

emissions, therefore you cannot delete a release point if it is assigned to one or more processes.

The following steps (5–7) allow you to reassign the processes that are currently venting to the 

release point you wish to delete to anther existing release point (Figure 40).

TIP: If the List of Processes Attached to the Selected Release Point table is blank, skip the 

remaining steps and click Finish to complete the wizard and delete the release point.
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Figure 40. Process reassignment to a release point

If the table displays a list of processes (similar to the one shown in Figure 41):

5. In the Assign New Release Point field, click [...] to bring up the list of existing release points.

6. Select the release point to which you wish to assign the processes.

7. Click Finish to complete the wizard and delete the selected release point.

IMPORTANT: If the release point you wish to assign does not exist or if the processes must be 

assigned to separate release points, you must close the Delete Release Point wizard, go to each 

process in question, and manually assign a new release point. After these steps you can try 

deleting the release point again.

3.2.7.6 Orphaned Release Points

Release points can be made but not assigned to sources. These unassigned, or orphaned, release points 

have no impact on emission calculations but should be either used or deleted. A report is available to 

identify orphaned release points in the Reports module (Section 8), under Other Reports. If you wish to 

bulk-delete unassigned release points, use the Remove Unassigned Release Points tool in the Emissions

module. See Section 3.5 for a detailed process description.

3.2.8 Calculator Parameters & Requests

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

In the Process section, the Calculator Parameters & Requests panel contains the main functionality of 

the AEM. It allows you to set the following parameters for each emission unit by month:

• Select input and physical parameters by month

• Copy inputs from a month to one or more other months

• Assign zero emissions for a month
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• Enter required throughput and calculation parameters in required fields (green boxes) and 

optional fields (white boxes)

• Provide process control information

• View emission factors for each pollutant

• Perform range checks and other QA for input parameters

Each emission unit has different input parameters based on the assigned calculator. For example, the input 

parameters for a combustion flare will differ significantly from the input parameters for fugitive 

emissions. 

Input parameters used for emission calculations and process descriptions are called Data Requests, while 

parameters used to describe the pollution control technology are described under Control Requests. Each 

field allows annotation and comments with the QA button to the right of the field as shown in Figure 42

below.

The following tabs are available, to be described further in the sections that follow.

• Data Requests allow input of required and optional data used for emissions calculations and 

process metadata.

• Control Requests are used to provide input data that describes the pollution control technology 

used for an individual source (if applicable).

• Emission Factors provide engineering parameters to calculate individual pollutant emissions.
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3.2.8.1 Data Requests

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

A typical Data Requests tab is shown in Figure 42. Green backgrounds indicate fields that are required, 

while white backgrounds indicate optional fields. Most processes contain some green fields.

Figure 41. Data Request tab

IMPORTANT: Although it is recommended that you complete as much information as possible, 

you can save your data even if not all information is complete. If only partial data is available, 

you can still enter it and save the changes to the process. You will not be able to calculate 

emissions for a particular month unless you have entered all required information for that month.

Please note that certain grey fields will auto-calculate results based on inputs to the required fields; for 

example, the Average Fuel Used shown in Figure 42 is calculated using the following formula:

Average Fuel Used =

7.5 ∗ Total Fuel Usage ∗ Fuel Heating Value

Operating Horsepower ∗ Hours of Operation per Month

Equation 1: Average Fuel Used calculation

The calculated result will appear automatically when the required input fields are filled. 
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Some input fields have drop-down menus with selection associated with the process, such as Emissions 

Destination and Material Processed shown in Figure 42. If a selection is not available for your process, 

contact the OCS AQS Support Team and let them know what additional options are required.

Finally, certain fields have pre-defined ranges of inputs to prevent out-of-range values or values with the 

wrong format (text in a numerical field). All field values must be within the defined ranges and format 

before they can be saved. A list of fields with ranges and the range values is provided for each calculator 

in Appendix A – Calculator Descriptions, but you can check the available range for any field by 

moving the mouse pointer over the field in question as shown on Figure 43.

Figure 42. View field value range

3.2.8.2 Control Requests

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

Control requests only capture information regarding pollution control technology used by the individual 

source. Unlike the Data Requests tab, Control Requests tab has a set number of input fields with 

reduction efficiencies for five pollutants (coarse particulate matter [PM10], carbon monoxide [CO], sulfur 

oxide [SOx], nitrogen oxide [NOx], and volatile organic compounds [VOCs]). For some calculators, only 

VOC reduction efficiency is requested since the process does not involve combustion or chemical 

transformation. A typical Control Request tab is shown in Figure 44.

Figure 43. Control Requests tab
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Control Request tab input fields include the following:

• Control Device?: Is a control device or end of pipe treatment included in the process? This is a 

Yes/No question.

• Primary Type of Control Equipment: If a control device is part of the process, what kind of 

device or technology is it? A drop-down menu is provided for most processes to select the 

primary type of equipment. If the equipment is not on the list, select Other (Explain in 

Comments) and describe it in the Operator Comments field (Figure 44).

Figure 44. Describe "Other" type of control equipment

• Is a Factory Acceptance Test Certificate attached for primary control equipment?: This 

field allows you to specify if functionality certification paperwork is available for the control 

equipment.

• Description of Control Equipment Chain: This field allows you to describe the control 

equipment chain if more than one type of technology is used.

• Reduction Efficiency – pollutant [%]: This describes the average reduction of emitted pollutant 

using the control technology. If the total reduction of VOCs using a vapor recovery unit is 65%, 

enter “65” in the field.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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3.2.8.3 Emission Factors

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

Emission factors are assigned to each calculator based on published values from USEPA AP-42 or other 

BOEM approved references. The values cannot be updated by operators. An example is shown in Figure 

46.

Figure 45. Emission Factors tab

A pollutant can have one of the following values:

• Numeric value: This value has been specified by BOEM and cannot be changed.

• Implicit: This code is displayed when the value has been incorporated into the calculator 

equation. This usually takes place if there is a conditional statement in the algorithm that uses two 

or more emission factors, depending on the process condition.
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3.2.9 Updating Monthly Data

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

Input parameters can be updated for each emission source on a month-by-month basis. OCS AQS 

provides two different ways to update data:

• Batch updates using the Activity Data Options Import/Export tool

• Manual updates using the Calculator Parameter & Requests feature described above

3.2.9.1 Download Monthly Data Using the Import/Export Tool

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility

To use the import/export tool, it is advisable to export the existing parameters first:

1. After selecting the facility and arriving at the AEM Details page, click Activity Data Options in 

the above the Emission Units & Processes table as shown in Figure 47.

Figure 46. Import/Export Activity Data selection

2. Select Run Activity Data Wizard from the drop-down box.

3. Select Export from the Import/Export Activity Data wizard mode selection. Click Next in the 

bottom right corner of the wizard window.

4. Select the emission sources to be exported by checking the square for each source or select all 

sources available at the facility by clicking on the box near the search bar. When completed, 

select Finish on the bottom right corner to process the request, Previous to go to the previous 

step, or Cancel to abort the operation.

5. Select the processed request from the Job Queue – Activity Data page by selecting the Files

hyperlink under the Actions column as shown in Figure 48. The most recent request will be at the 

top of the table, but the table can be sorted or searched to find a specific request.

IMPORTANT: To come back to the Job Queue, select Open Activity Data Queue from the dropdown box shown previously in Figure 47.
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6. To save the processed Excel file to your computer, click Files in the Actions column. The link 

will take you to a Job Files page. 

7. Click Download and save the file to your computer. Please note that most browsers support file 

renaming, so users can enter the specific file name they want to use. If the browser does not allow 

changing file names, save using the default name and rename using the File Explorer; click twice 

(not double-click) and rename the file.

Figure 47. Export Activity Data – Queue and Download pages

3.2.9.2 Update Monthly Activity Data Using the Import/Export Template

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility > Export Activity 

Data

After you have downloaded the Excel sheet with your facility’s emission sources, update the monthly 

activity data with the following steps:

1. Open the Excel file for the emission source you want to update. The file has individual data tabs 

for each source data request and a tab for each control request that is used by at least one source. 

The Summary sheet provides hyperlinks to go to the individual emission source data and control 

requests (Figure 48). 

IMPORTANT: Do not change the data on the Summary sheet. Changing the Summary sheet 

may cause import errors.
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Figure 48. Export summary sheet

2. Update parameters by month as shown in Figure 50. Note that the required fields for the emission 

calculators are listed in the top rows between EMISSION CALCULATOR REQUIRED 

PARAMETERS and OTHER INFORMATION in column A. The cells for the monthly values 

for these parameters are colored in green and must be filled. 

IMPORTANT: Match input values to the units of measure shown in the description column of 

the spreadsheet. For example, input parameters for percentages [%] mean that a value of 0.05%

should be entered as “0.05”.

IMPORTANT: For Yes/No responses, the template uses “T” for Yes (True) and “F” for No

(False).

IMPORTANT: The fields colored in light grey are auto-calculated. Regardless of the value in 

these fields at the time of import, it will be replaced by a calculated value based on the formula 

specified in the application.

TIP: The last two columns in each spreadsheet are Value Range and Lookup Values and display 

information that will allow you to properly fill in the data. For the lookup values, make sure that 

you copy and paste the appropriate selection to avoid typos that would prevent you from 

importing the file.

Figure 49. Data request sheet
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3.2.9.3 Updating Control Data Using the Import/Export Tool

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility > Export Activity 

Data

The Control Request sheets do not have monthly columns like the Data Request sheets because it is 

assumed that conditions will not change significantly over the inventory reporting period. An example 

Control Data sheet is shown in Figure 51. 

Figure 50. Control request sheet

The assigned calculator shown on the Summary sheet will show which control is assigned to each 

emission unit. The calculator ID is similar to the Control ID, except the calculator has an M while the 

Control has a C (for example: BOI-M01 is the calculator, and BOI-C01 is the Control).

Like the Data Request fields, Yes/No fields should be entered as “T” for Yes and “F” for No. Percentages 

should be entered as written without the percent symbol (e.g., “98.5” for 98.5%).

3.2.9.4 Importing Monthly Data Using the Import/Export Tool

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility > Export Activity 

Data > Update Activity Data Spreadsheet

After updating the parameters in the exported file, you will need to import it back into OCS AQS (Figure 

51):

1. Save the updated file with your revised parameters.

2. Click Activity Data Options in the above the Emission Units & Processes table as shown in

Figure 47 and select Run Activity Data Wizard.

3. Select Import in the Import/Export Activity Data wizard mode selection. Click Next on the 

bottom right corner of the wizard window.

4. Click Select file, then navigate to and select the Excel file to upload from your computer. To 

upload multiple facilities, select the corresponding facility files. The files should be in the same 

directory. Click Finish to import.

5. In the Job Queue – Activity Data, click OK to close it or check the uploaded job files by 

clicking on Files in the Action column.
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6. If you click on Files, you will open a Job Files window that shows the files imported, as well as 

an Import log spreadsheet. Download any of the files by clicking on Download next to the file in 

the Download column.

Figure 51. Import Activity Data – Queue and Download pages

7. The import log file, Import_Log.xlsx, will show the status of each imported source and the 

results of the QA/QC check. A summary of errors will be identified for the source and section 

(Summary, Data Requests, and/or Control Requests) on the Summary sheet as shown in Figure 

53. Individual errors and location in the source worksheet are shown in the Errors sheet.

Figure 52. Example of import log with errors

It is highly recommended to fix errors and re-import before trying to calculate emissions. Comment on 

errors in the AEM by clicking by the parameter in question.
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3.2.9.5 Updating Using the Calculator Parameters & Requests Feature

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility 

For individual emission sources or small updates, Calculator Parameters & Requests allows fast and 

easy editing. 

1. On the AEM Details page, select the emission source for editing and scroll down to the

Calculator Parameters & Requests feature. The data is already in Edit mode and available for 

updating.

2. Select the month you want to update using the drop-down menu or the control arrows as shown in

Figure 54.

Figure 53. Month selection controls

3. For the selected month, update the parameters by completing the data fields. Green fields indicate 

required data and must be filled in. White fields are optional data. A button is available to 

the right of each field to add optional notes and comments regarding the specified value for each 

field. 

4. Confirm the input parameters meet range and input requirements by clicking on the red QA/QC

button, as shown in Figure 55. If there are no issues, a blue message will appear stating that there 

are no QA/QC issues for the emission source under edit. If there are errors, the specific field and 

month for the error will be identified similar to the example shown in Figure 55. In this example,

a required field (Total Fuel Usage) is out of range in the Data Requests tab, and the Average 

Fuel Used value (which is calculated using Total Fuel Usage) is invalid.
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Figure 54. Example QA/QC report for emission source

5. Save the updated values by clicking Save. To return to Edit mode, click Edit. 

3.2.10 Zero Emissions

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility 

This section describes how to specify that a certain emission unit did not produce emissions during 

specific months in the inventory year. If you wish to indicate that the entire facility did not produce 

emissions, see Section 3.2.5.6.

To report zero emissions from an emission source for a month (or months):

1. On the AEM Details page, select the emission unit for editing and scroll down to the Calculator 

Parameters & Requests feature. 

2. Select the Options pull-down menu next to the QA/QC button as shown in Figure 56 and select 

Zero Emissions.

Figure 55. Options selection for Zero Emissions

3. Check the box for each month you want to declare as zero emissions.
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4. After a month is selected, the corresponding Select Reason box will be activated. Click on [...]

(extra options) on the right of the box to open a list of possible reasons why the month has zero 

emissions. Select the most appropriate reason from the available choices for all months that have 

been marked as “zero emissions” (Figure 56).

Figure 56. Emission Unit Zero Emissions

5. Click Save to save changes. A confirmation message will be displayed to ensure that appropriate 

number of months are zeroed for the specified process.

6. After selecting the months that should be zeroed out and closing the Zero Emissions dialog, all 

emissions (calculated or imported) will be set to 0 for the selected months.

3.2.11 Copying Months

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility 

Emission source parameters from one month can be quickly copied to all months or any individual month. 

This tool copies all parameters.

1. On the Activity & Emissions Manager Details page, select the emission source for editing in the 

Emission Units & Processes table and scroll down to the Calculator Parameters & Requests

section.

2. Select the Options pull-down menu next to the QA/QC button as shown in Figure 58 and select 

Copy Monthly Data.
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Figure 57. Options selection for Copy Monthly Data

3. The Copy Monthly Data window will open. Select the month to copy activity data parameters 

FROM (you can choose only one).

4. Select the months or months to copy data TO. A Select All button is available to copy to all 

months. Click Copy to complete the action. An example is shown in Figure 59. In the example, 

the month of January is copied to February and March.

Figure 58. Example to copy data to months
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3.2.12 Calculate Emissions

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility 

Emissions from a source can be calculated within the Activity & Emission Manager by month using the 

input parameters from the assigned calculators and the information provided in the Data Requests, 

Control Requests, and Emission Factors tabs.

The assigned calculator is shown at the top of the Calculator Parameters & Requests section. More 

information about the individual calculator used, such as the actual equations and input variables used, 

can be found by running an Emissions Equation Description report under the Calculators section in the 

Reports module. 

IMPORTANT: You will only be able to calculate emissions if you have filled in all required 

parameters and specified a release point for the emission unit/process.

To calculate emissions with an existing calculator:

1. On the Activity & Emissions Manager Details page, select the emission source for which you 

wish to calculate emissions and scroll down to the Calculated Emissions section near the bottom 

of the page.

2. If emissions have never been calculated, you will see a Calculate button. If emissions have been 

previously calculated, you will see a Re-Calculate button. Selecting either Calculate or ReCalculate will give you two options as shown in Figure 60.

Figure 59. Calculate/Re-Calculate options

a. Current: This option allows operators to calculate only the active source you are 

working on. It is recommended when making updates only to a specific emission source.

b. All: This option allows operators to calculate emissions for all sources assigned to the 

facility/platform.

IMPORTANT: If either Current or All is not available, it means that the months for which you 

are trying to calculate emissions are set to zero emissions.

WARNING: Previous emission values will be lost and overwritten when the selection is made. 

For Current calculations, only the emissions for the active month will be overwritten.

IMPORTANT: You can only calculate emissions when in the Edit mode.

3. The calculations may take several seconds to process depending on the number of pollutants 

reported for the emission source.

4. A table will appear with calculated monthly emissions as shown in Figure 61.
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Figure 60. Table showing calculated monthly emissions 

3.2.13 Global Warming Potential Details

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility 

Global Warming Potential (GWP) values are a measure of how much energy the emissions of 1 ton of gas 

will absorb over a given period of time, relative to the emissions of 1 ton of carbon dioxide (CO2). The 

GWPs used in the application were acquired from Second, Fourth, and Fifth IPCC Assessment Reports.

OCS AQS allows BOEM to create sets of GWP values that can then be assigned to operator inventories 

and used to calculate carbon dioxide equivalent (CO2e) values. 

IMPORTANT: Operators cannot create or edit GWP values, sets, or assign these sets to 

inventories. 

You can view the set of GWP values assigned to the inventory by clicking GWP Details in the 

Calculated Emissions section, as shown in Figure 62.

Figure 61. GWP Details button
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Doing so will load the details of the GWP set used for calculations in the current inventory (Figure 62).

Figure 62. GWP Set Details

For each standard in the set the table displays the following information:

• Pollutant: The pollutant with which the standard value is associated

• GWP 100-Yr: Standard value used to calculate CO2e

• Effective Year: Year the standard was implemented

• Agency: Name of the agency that established the standard

3.2.14 Combustion Flares

OCS AQS breaks down each stationary emission source into a release point and an emission unit. The 

release point is the physical transfer location of emissions from a process to the atmosphere. For most 

processes, the release point is the top of a smokestack. For flares and open flames, it is the exterior 

surface of the flame as shown in Figure 64. Estimation of the flame height and diameter can be done 

using pseudo-parameter calculations.

However, for OCS AQS reporting purposes, only the physical flare stack height and tip diameter are 

required. If the flare has multiple tips or nozzles, the combined diameters should be used.
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Figure 63. Flare release point parameters

For flares on platforms, the physical height assumes the height of the flare stack above mean sea level.

This information was obtained from the Summary of Platform BOEM Records2

3

.

Users should create flares based on flare design specifications as listed in the manufacturer’s information 

and use the total volume (including pilots).

3.2.15 Adding Supporting Documentation

Pathway: Emissions > Platform Sources > Activity & Emissions Manager (AEM) > Select Facility 

On the occasions when documentation supporting certain claims (e.g., emission control reduction 

efficiency) is required. There are two places where you can upload these documents:

• In the AEM (described below)

• In the Companies & Complexes (described in Sections 3.4.1.1 and 3.4.4)

IMPORTANT: Each Supporting Documentation entry is a set, which may contain multiple 

documents.

To upload supporting documentation in AEM:

1. Go to the main list of facilities in the AEM.

• Either go to the Emissions module and click the Activity & Emissions Manager (AEM)

navicon, or

• Click < Facilities in the top left corner of the AEM interface

Depending on your previous activities, the OCS AQS may remember the last facility you worked 

with and filter the list of supporting documentation entries to show only documentation uploaded 

3 https://www.boem.gov/sites/default/files/environmental-stewardship/Environmental-Studies/Gulf-of-MexicoRegion/Air-Quality/Readme-2011-Gulfwide-Platform-file.doc
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for this facility. In this case you will see the name of the facility above the table as shown in 

Figure 65.

Figure 64. Documentation filtered by facility

If the filter is reset, a full list of available documentation entries grouped by facility will be 

shown. You can also filter this list to display a list of facilities that do not have any documents 

uploaded (Figure 65).

Figure 65: Unfiltered documentation list

2. Click Add Supporting Documentation to load a wizard that will help you upload the 

documentation files.

3. If you are starting from a filtered list, go to step 5. If starting from an unfiltered list, the first step 

allows you to select the facility for which you wish to upload documentation.

4. Select a facility and click Next.

5. In the Document Set Info step, specify the Document Set Name (required) and a brief 

Description of the document (optional), and click Next.

6. In the Specify Document Info step, upload the files that will be included in the set as follows:

a. Click Select file.

b. Navigate to and select a documentation file you wish to include in the set.

c. Select the file type based on the document you specified.

d. Enter any notes associated with the file to distinguish it from others in the set.

e. Click Upload to add the document to the set.

f. Repeat with remaining documents.
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7. After all documents have been specified, click Finish.

The specified files will be grouped under a single document set entry.

3.3 Batch Emissions Calculator (BEC) – Platform Sources

Section 3.2.13 showed how to calculate emissions for a single emission unit over the reporting period. 

The BEC allows for the emissions from all emission units within a facility (or a collection of facilities) to 

be calculated together.

3.3.1 View Previous Facility Calculations

Pathway: Emissions > Platform Sources

Select the BEC – Platform Sources navicon under the Emissions module, Platform Sources section. 

This will take you to a Summary List page as shown in Figure 67 that shows all previously run 

calculations. Historical results can be viewed by selecting View Files under the Actions column. If there 

is no link, that means a calculation is taking place.

IMPORTANT: If the link does not appear after several minutes, refresh the screen.

Figure 66. Batch Emissions Calculator (BEC) summary page

Downloaded files include the following:

• Emission calculations tabs: Tab for each emission period (JAN, FEB, MAR, etc.) that contains 

parameters used to calculate the emissions for each process and the calculated total

• BEC Calculation Status tab: A list of individual steps in the BEC run

• ERRORS: List of errors encountered during calculations

• CloudJobLog: Log of details of the processing job

3.3.2 Run New Facility-Wide Calculations

Pathway: Emissions > Platform Sources > BEC – Platform Sources

To run a new calculation, click Run BEC – Platform Sources above the Summary List table. This will 

take you to a wizard that will guide your selections.

1. Check the box for each facility for which you want to calculate.

2. Click Next to continue.

3. Select the time periods for which you wish to calculate the emissions. You can either check 

individual months or check the Select All option. 

4. Add any notes related to the calculation run. 

5. Click Next to continue.
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6. Review your input selection.

IMPORTANT: The Create Missing Emission Period option allows you to indicate that you 

want to calculate emissions for all time periods, even if emission periods are not defined for some 

months. This option is enabled by default.

7. Click Finish to begin the calculation process.

3.3.3 BEC Job Queue

Pathway: Emissions > Platform Sources > BEC – Platform Sources

You can follow the status of the calculations by going to the Job Queue – Batch Emission Calculation

page (Figure 67). Select Job Queue in the Navigation Panel. 

Figure 67. BEC Job Queue

3.4 Companies & Complexes

Pathway: Emissions > Platform Sources

Selecting the Companies & Complexes navicon under the Emissions module allows you to view and 

manage operating companies and complexes.

3.4.1 Companies

Pathway: Emissions > Platform Sources > Companies & Complexes

After you click on the Companies & Complexes navicon, you are taken to the page that displays the

active company in your current inventory.

• View the company details by clicking either the link in the Company Name column or the View

option in the Actions column.

• View the list of complexes that belong to the company by clicking Complexes in the Navigation 

Panel. An operator will only see complexes that belong to their company, while an 

administrative-level user will see all complexes in the database.

• View the list of facilities operated by the company by clicking Facilities in the Navigation Panel.

An operator will see all facilities that belong to their company (not filtered by a specific 

complex), while an administrative-level user will see all facilities in the database.

• View the list of supporting documentation entries by clicking Supporting Documentation in the 

Navigation Panel. You can filter this list to view all Supporting Documentation entries or a list 

of facilities that do not have any documentation uploaded.
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3.4.1.1 Company Details

Pathway: Emissions > Platform Sources > Companies & Complexes > Select Company

Selecting a company from the list (or clicking on the View option) will open the detailed editor page that 

provides information related to the company, including the list complexes and associated facilities. From 

this page, you can edit the information and add contacts by clicking Edit. Figure 69 shows an example of 

the detailed editor.

Figure 68. Company information page

In the detailed editor you can perform the following functions shown in Table 2.
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Table 2. Edit company details

Detail Action Directions

Company Edit Details

Edit company details (including adding Company Contacts; see Section 

3.4.1.2) by clicking Edit in the Company panel.

IMPORTANT: The BOEM Company Number parameter must be a five-digit 

number. If the number is less than five digits, it must be padded with leading 

zeroes (e.g., 00123).

Complexes Create New Create a new complex for the company listed in the left side of the screen by 

clicking Add above the list of complexes in the Complexes panel.

Complexes View Details View the details of an existing complex by clicking the link in the Complex ID 

column or the View link in the Actions column.

Complexes Edit Details Edit the details of an existing complex by clicking Edit in the Actions column.

Complexes

View 

Associated 

Facilities

View facilities located within the complex by selecting (highlighting) the 

complex in the table.

Facilities Create New Create a new facility located inside the complex highlighted in the 

Complexes table by clicking Add above the list of facilities.

Facilities View Details View the details of an existing facility by clicking the link in the Facility ID 

column or the View link in the Actions column.

Facilities Edit Details Edit the details of an existing facility by clicking Edit in the Actions column.

Support 

Documentation Upload New

Upload a new set of documents for the facility highlighted in the Facilities 

table by clicking Add above the list of documents. See detailed upload 

instructions below.

Support 

Documentation View Details View the details of an existing document set by clicking the link in the Document Set Name column or the View link in the Actions column.

Support 

Documentation Edit Details Edit the details of an existing document set by clicking Edit in the Actions column.

To upload a new document set:

1. Select the facility for which you wish to upload the documents in the Facilities table.

2. Click Add in the Supporting Documentation table.

3. In the Document Set Info step, specify the Document Set Name (required) and a brief 

Description of the document (optional) and click Next.

4. In the Specify Document Info step, upload the files that will be included in the set as follows:

a. Click Select file.

b. Navigate to and select a documentation file you wish to include in the set.

c. Select the file type based on the document you specified.

d. Enter any notes associated with the file to distinguish it from others in the set.

e. Click Upload to add the document to the set.

f. Repeat with remaining documents.

5. After all documents have been specified, click Finish.
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3.4.1.2 Add Company Contacts

Pathway: Emissions > Platform Sources > Companies & Complexes > Select Company

To add (or delete) contacts, click Edit in the top right corner of the Company details panel to go into edit 

mode and scroll down to and click Add Contact in the Company Contacts panel as shown in Figure 70.

Figure 69. Company Contacts panel

The Add Contact data entry form will load the following:

1. Existing Contact: Select the name from the Contact list by clicking [...] and opening the option 

table. Select the Contact Role. 

TIP: One person can have multiple roles, but you must create a separate Company Contact

record for each role for that person.

2. New Contact: Complete the contact information and assign a Contact Role.

3. Click Save to save entry.

Available Contact Roles are 

• Company Responsible Official

• Complex Responsible Official

• Facility Responsible Official

• Inventory Preparer

• Inventory Reviewer

• BOEM Representative

• BSEE Representative

IMPORTANT: Contact Roles refer only to the person’s involvement with the OCS Emissions 

Inventory and should not be confused with the actual job or job title of the person.

3.4.1.3 Edit/Delete Company Contacts

Pathway: Emissions > Platform Sources > Companies & Complexes > Select Company

To edit or delete contacts, go into Edit mode for the company and select Edit or Delete under the Actions

column for the contact you want.
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If you are editing the contact, the contact details data entry form will load. Make edits and click Save to 

commit your changes.

3.4.2 Complexes

Pathway: Emissions > Platform Sources > Companies & Complexes > Complexes > Select Complex

In the Companies & Complexes Navigation Panel, click on the Complexes option. The page will display 

a list of complexes that belong to the operating company. Select the complex you want to view from the 

list. This will take you to the Complex Details editor page similar the one shown below in Figure 71.

Figure 70. Complex Details page

This page functions in a similar way to the Company Details page described in Section 3.4.1.1.

In this detailed editor, you can perform the following functions shown in Table 3.

Table 3. Edit complex details

Detail Action Directions

Complex Edit Details Edit complex details (including adding Complex Contacts, see Section 

3.4.1.2) by clicking Edit in the Complex panel.

Facilities Create New Create a new facility for the complex listed in the left side of the screen by 

clicking Add above the list of facilities in the Facilities panel.

Facilities View Details View the details of an existing facility by clicking the link in the Facility ID 

column or the View link in the Actions column.

Facilities

View 

Associated 

Facilities

View facilities located within the complex by selecting (highlighting) the 

complex in the table.

Support 

Documentation Upload New

Upload a new set of documents for the facility highlighted in the Facilities 

table by clicking Add above the list of documents. See detailed upload 

instructions below.
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Detail Action Directions

Support 

Documentation View Details View the details of an existing document set by clicking the link in the Summary column or the View link in the Actions column.

Support 

Documentation Edit Details Edit the details of an existing document set by clicking Edit in the Actions column.

For more information on how to upload supporting documentation, see Section 3.4.1.1.

IMPORTANT: Please make sure that each facility has a Company Responsible Official contact.

3.4.3 Facilities

Pathway: Emissions > Platform Sources > Companies & Complexes > Facilities

In the Companies & Complexes Navigation Panel, click on the Facilities option. The page will display a 

list of facilities that belong to the operating company. This list is not filtered by complex in which the 

facilities are located, but this information is available in the table, in the Complex column.

From this table, you can

• View facility details by clicking either Facility ID or View in the Actions column for the facility 

in question.

• Open facility details in edit mode by clicking Edit in the Actions column.

• Create a new facility by clicking Add Facility and filling in the required details.

3.4.4 Supporting Documentation

Pathway: Emissions > Platform Sources > Companies & Complexes > Supporting Documentation

In the Companies & Complexes Navigation Panel, click on the Supporting Navigation option. The 

page will display a list of document sets that have been uploaded for the company’s facilities. This list 

can be filtered by a specific facility, in which case the facility name and ID will be displayed above the 

table, or the list can be unfiltered. In an unfiltered list, you can either display all document sets in the 

inventory or display all facilities that have no documentation uploaded.

From this table, you can

• View document set details by clicking either the document set name or View in the Actions

column for that entry.

• Open document set details in edit mode by clicking Edit in the Actions column.

• Delete a document set by clicking Delete in the Actions column.

WARNING: Deleting a document set will delete all documents in that set.

• Upload additional documents by clicking Add Supporting Documentation. The procedure is the 

same as in Activity & Emissions Manager (see Section 3.2.15 for more details).
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3.5 Remove Unassigned Release Points

Pathway: Emissions > Platform Sources > Remove Unassigned Release Points

The Remove Unassigned Release Points tool (Figure 71) allows you to bulk-delete release points that 

have been defined in the system but are no longer used and are not attached to a specific emission 

unit/process.

To access this wizard, click on the Remove Unassigned Release Points navicon. This will display a table 

of all release points that are currently not assigned to any emission unit/process.

Do the following to remove unassigned release points: 

1. Check the box for every release point you wish to delete. Use the Search bar above the table and 

the filter in the Facility column to narrow down the available release points.

2. Click Finish to delete the release points.

A confirmation message will display the final number of selected release points.

Figure 71. Remove unassigned release points

IMPORTANT: Deleting release points will permanently remove them from the inventory. This 

action cannot be reversed.
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4 Emissions: Lease Operations

Operators are required to account for emissions from non-platform operations if they include the 

following:

• Drilling rigs when connected to the seabed

• Installation support vessels (CSV)

• Well stimulation vessels (WS)

• Domestic and foreign self-propelled drill rigs

The functions available to operators for lease operations are shown in Figure 72 and can be accessed by 

first clicking on the Lease Operations section in the Emissions module Navigation Panel.

Figure 72. Lease Operations map

4.1 Managing Lease Operations

OCS AQS has imported all the known leases available on the BOEM Data Center website 

(https://www.data.boem.gov/). If new leases are required for the company, they can be added.

Lease operations can be managed using a process summarized in Figure 73.

Figure 73. Summary of lease operations emissions
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4.2 Lease Operations Emissions Manager

Pathway: Emissions > Lease Operations > Lease Operations Manager > Select Lease

The Lease Operations Emissions Manager is similar to the Activities & Emissions Manager (AEM)

used in Platform Sources. However, this tool is specifically used to calculate emissions for non-platform 

sources such as drilling rigs connected to the seabed and installation support vessels when performing 

installation activities. You can create a lease operation process based on existing templates and enter 

parameters that describe the process activity. Then you can calculate the emissions generated by these

non-point processes. 

To use the Lease Operations Emissions Manager, select the Lease Operations option from the 

Navigation Panel of the Emissions module and then click on the Lease Operations Emissions Manager

navicon. This will take you to the Leases page, similar to what is shown in Figure 75. 

Click on the lease number in the BOEM Lease Number column of the Leases table or View in the 

Actions column to view the details of the lease and associated sources. 

Figure 74. Leases page and selecting BOEM lease number
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4.2.1 Add a Lease

Pathway: Emissions > Lease Operations > Lease Operations Manager

If a lease is not shown, it must be added using the Add Lease button. Only official BOEM leases can be 

added.

In the Leases page, select Add Lease, which is located in the upper right corner of the page shown in 

Figure 75. This will take you to the Add Lease page as shown in Figure 76.

Figure 75. Add Lease page

If you wish to specify sources under an existing lease associated with a complex, check the Part of a 

Complex option, and select the appropriate complex by clicking [...] for the Complex ID. All associated 

fields will then be automatically filled with the appropriate information. 

If you wish to define a brand-new lease, check the Not Part of a Complex option and fill in the required 

information manually.

Save the new lease by clicking Save, and the new lease will appear in the list of available leases.

4.2.2 Lease Source vs Emission Process

The Lease Sources & Processes table displays information for two types of elements in the database—

lease operation sources and their associated processes. 

A Lease Source is a preconfigured source for a particular type of operation. In OCS AQS, there are six

main types of lease operations sources:
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• Installation Support Vessel

• Drilling Rig for Crude Oil Exploration / Production Wells

• Drilling Rig for Natural Gas Exploration / Production Wells

• Self-Propelled Drill Rig - US Flagged (Domestic)

• Self-Propelled Drill Rig - Foreign Flagged

• Well Stimulation Vessel

There are processes associated with each source type, as described in Table 4 below.

Table 4. Processes created based on operation source type

Operation Type Process ID Process Description SCC

Installation Support 

Vessel DIE-M02R-LO Diesel Engine Where Max HP < 600 2280002201

Installation Support 

Vessel DIE-M03R-LO Diesel Engine Where Max HP > = 600 2280002201

Drilling Rig - Crude Oil DIE-03M-DO Crude Oil Production Well Drilling - Diesel 

Engine 2280002201

Drilling Rig - Natural 

Gas DIE-03M-NG Natural Gas Production Well Drilling - Diesel Engine 2280002201

Self-Propelled Drill 

Rig - US Flagged C1C2-DRILL-LO Drilling from C1/C2 Vessels (U.S. Flagged) 2280002201

Self-Propelled Drill 

Rig - Foreign Flagged C1C2-DRILL-LO-F Drilling from C1/C2 Vessels (Foreign Flagged) 2280002201

Well Stimulation 

Vessel DIE-M02R-LO Diesel Engine Where Max HP < 600 2280002201

Well Stimulation 

Vessel DIE-M03R-LO Diesel Engine Where Max HP > = 600 2280002201

The Non-Point Lease Operations (NPLO) Process (also known as Lease Source Process) allows you 

to add an additional activity type not accounted for by the basic source. For example, in a CSV, if you 

have additional diesel engines operating independent of the main shipboard engines, you can add them to 

the source using this mechanism.

Each line in the Lease Sources & Processes table displays a specific process AND the source to which it 

belongs, as shown in Figure 77.
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Figure 76. Lease operations and processes

In the Actions column, the actions apply as follows:

• View/Edit/Copy: Lease operation source only

• Delete: Process and/or lease operations source (deleting a process will NOT delete the lease 

source as long as there are other processes under it)

4.2.3 Edit Existing Lease Operation Sources

Pathway: Emissions > Lease Operations > Lease Operations Manager > Select Lease

A lease covers one or more emissions source. To edit an existing lease operation source, first select an 

existing BOEM lease number as previously demonstrated in Section 4.2.

Then, from the Lease Sources & Processes table, select the source you wish to edit. After that, click Edit

under the Actions column. Figure 78 shows the source selection and the edit button.

Figure 77. Source selection

The Edit Lease Source dialog will load allowing you to make the necessary changes. You may need to 

scroll down to reach all available panels. When finished, click Save as shown in Figure 79.
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Figure 78. Edit Lease Source

4.2.4 Add Lease Operation Source

Pathway: Emissions > Lease Operations > Lease Operations Manager > Select Lease

To add a lease operation source, click Add Lease Source above the Lease Sources & Processes table.

Follow the steps below to set up your new lease operations source.

1. Select the applicable Lease Source Template. The following equipment sources are provided for 

lease operations in Table 5.

Table 5. Sources for lease operations

Source ID Source Type

CSV-PC Platform Construction (PC)

DRI-Crude Drilling (DR)

DRI-NG Drilling (DR)

DRI-SP-DOM Drilling (DR)

DRI-SP-4N Drilling (DR)

CSV-WS Well Stimulation Vessel (WS)

2. The following step allows you to specify required information regarding the drilling rig, support 

vessel, or well stimulation vessel based on the type of operation you selected as shown in Figure 

80. 

• For Drilling Rigs: In the Drilling Rig Information panel, click [...] and select a rig from the 

list of existing ones. The list displays the general configuration and specifications of the rig. 

More specific information is provided in the Process details after the source and associated 
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processes have been created. If the rig you wish to add is not on the list, contact OSC AQS 

support team and request that it be added.

• For Support Vessels: In the Construction Support Vessel Information panel, type in the 

name of the vessel. There is no list to select from.

• For Well Stimulation Vessels: In the Construction Support Vessel Information panel,

type in the name of the vessel. There is no list to select from.

If the georeferenced location of the source is unknown, an estimate can be generated by clicking From 

Area Block Location (highlighted in red in Figure 80). This provides the center point of the block the 

lease is assigned to.

Figure 79. Lease Source location

3. Click Finish to save changes. OCS AQS will automatically generate processes associated with 

the operation you selected as shown in Table 2.

IMPORTANT: The processes that are automatically generated are default processes that each 

operation source type should have. You can add or remove processes as needed.

After the sources and processes are in place, you can specify the activity data in the Data Request tab of 

the Calculator Parameters & Requests panel, as described in Section 4.2.6.

4.2.5 Add/Delete Lease Operation Processes

Pathway: Emissions > Lease Operations > Lease Operations Manager > Select Lease

To Add an NPLO process associated with an existing lease operation source, click Add NPLO Process, 

as shown in Figure 81.
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Figure 80. Add NPLO Process button

A one-step wizard (Figure 81) allows you to specify all the information required to create the process:

1. Select the Source for which you wish to create the process. 

2. From the table of available calculation methods, select the one that will be used to calculate 

emissions for this process.

3. The Process ID will be updated to match the Name of the estimation method, and the Process 

Description will be updated to match the Description of the same method.

4. Click Finish.

Figure 81. Add lease operation process

To delete an individual process (Figure 82), select Delete under the Actions column of the process you 

want to remove. On the confirmation window, click Delete to remove the process from the source.
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IMPORTANT: Deleting a process will NOT delete the lease source, as long as there are other 

processes under it.

Figure 82. Delete lease operation process

4.2.6 Calculator Parameters & Requests

Pathway: Emissions > Lease Operations > Lease Operations Manager > Select Lease

In the Process section, the Calculator Parameters & Requests panel contains the main functionality of 

the Lease Operations Emissions Manager. It allows you to set the following parameters for each 

process by period (time between Date Moved On and Date Moved Off):

• Select input and physical parameters

• Enter required calculation parameters in required fields (green boxes) and optional fields (white 

boxes)

• Provide process control information

• View emission factors for each pollutant

• Perform range checks and other QA checks for input parameters

Each process has different input parameters based on the assigned calculator. For example, the input 

parameters for a diesel engine will differ from those used in a propelled drill rig process. 

Input parameters used for emission calculations and process descriptions are called Data Requests. Each 

field allows annotation and comments with the QA button to the right of the field as shown in Figure 84.

A description of lease operation calculator and Data Request input fields is provided in Appendix B.
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Figure 83. Lease Operations Data Request tab

The following tabs are available:

• Data Requests allow input of required and optional data used for emissions calculations (for 

more information see Section 3.2.8.1).

• Emission Factors provide engineering parameters to calculate individual pollutant emissions (for 

more information see Section 3.2.8.3).
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4.2.7 Calculate Lease Operation Emissions

Pathway: Emissions > Lease Operations > Lease Operations Manager > Select Lease

Emissions can be calculated for the reporting periods after all required data request fields are filled in

(Figure 84). Check completeness and input ranges by clicking on the red QA/QC button. If input data is 

filled and within range expectations, a blue status message will be displayed. Erroneous/incomplete data 

fields will be highlighted with a red border and a pop-up window will load with the list of errors.

Click Calculate (or Re-Calculate if emissions had been previously calculated) when all input parameters 

are error-free. Depending on the calculator and the number of months in the period, the processing may 

take several minutes. Calculated emissions will appear in the table under the button.

Click GWP Details to review the global warming potential standards used to calculate the CO2e values. 

For more information on GWP Details see Section 3.2.14.

Figure 84. Lease Sources Calculated Emissions
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5 Emissions: Tools

The Tools section of the Emissions module provides a number of different tools that help manage 

emission sources. Figure 86 shows the options available in this section.

Figure 85. Other Emissions module functions

5.1 Facility Activity Data Import/Export

Pathway: Emissions > Tools 

While you can import and export activity data for a specific emission unit directly in AEM (see Section 

3.2.9.1), you can also perform a batch import or export of activity data for all processes for multiple 

facilities.

To export activity data:

1. Click the Facility Activity Data Import/Export navicon.

2. Click Import/Export Facility Activity Data.

3. Check the Export option and click Next.

4. Check the box for each facility for which you wish to export activity data. The activity data for all

processes at those facilities will be included. 

5. Click Finish to complete the wizard and generate the data file.

6. You will be taken to the Job Queue – Activity Data page, which shows the progress of you 

export, as shown on Figure 87. When the export is completed, the Status of the export is updated

to Complete, and the generated files can be downloaded.

Figure 86. Facility Activity Data queue
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7. In the Actions column of the table, click Files to view the exported file(s). 

8. The Job Files dialog is shown. Click Download as shown in Figure 88 to save the file to your 

computer. 

Figure 87. Activity Data download link

After the file is on your hard drive, you can open it and edit the values as needed. When finished, you can 

import the file to update the activity data.

To import activity data:

1. Click the Facility Activity Data Import/Export navicon.

2. Check the Import option and click Next.

3. Click Select file, then navigate to and select the file that contains activity data.

4. If multiple files are being imported, repeat step 3 until all files have been specified.

5. Click Finish to complete the wizard and upload the activity data.

5.2 Facility e-GGRT Export 

Pathway: Emissions > Tools 

The USEPA's electronic Greenhouse Gas Reporting Tool (e-GGRT) supports facility and supplier 

reporting for the USEPA Greenhouse Gas Reporting Program (GHGRP). OCS AQS contains a tool 

capable of generating an e-GGRT file in the appropriate XML format for submission to USEPA for a 

single facility or a complex with multiple facilities. 

To generate and export an e-GGRT report for a specific facility:

1. In the Emissions module, go to the Tools section in the Navigation Panel.

2. Click on Facility e-GGRT Export navicon.

3. Click Export Facility e-GGRT in the Summary List – Facility e-GGRT Export screen as 

shown in Figure 89. 

Figure 88. e-GGRT report export

4. Select the e-GGRT Export Mode you want. The options are
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• By Facility (Individual): This option will generate a report for the facility selected only—go 

to step 6.

• By Complex (Aggregated): This option will generate a report that sums the total GHGs for 

all the selected facilities and lists the emission units within one report—go to step 5.

5. If you selected By Complex, highlight the complex where the facilities are located and click 

Next.

6. Check the box for each facility you wish to include in the export and click Next.

7. Review the summary information to confirm selected options and click Finish to complete the 

wizard and start the export.

8. You will be taken to the Job Queue – Facility e-GGRT Export, which shows the progress of 

your export as shown in Figure 90. When the export is completed, the Status of the export is 

updated to Complete, and the generated files can be downloaded.

Figure 89. Facility e-GGRT Export queue

9. In the Actions column of the table, click Files to view the exported file(s). 

10. The Job Files dialog is shown. Click Download as shown in Figure 91 to save the file to your 

computer. 

Figure 90. e-GGRT report download link

The downloaded file is in a .zip format with an Excel spreadsheet that contains an export report and 

individual XML files for each facility.

You can open the XML file on your computer using any editor. It is recommended that you use an editor 

capable to displaying XML files, or the content may be difficult to read. You can also open the file in a 

browser such as Microsoft Edge.

5.3 Facility Metadata Export

Pathway: Emissions > Tools 

OCS AQS contains a tool capable of generating an XML file containing metadata for emissions inventory 

submissions to BOEM. 
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IMPORTANT: While the facility metadata report is not required for submittal, if it has been 

generated, it will be included with the QA/QC files during the submittal procedure.

To export a metadata report for a particular facility:

1. Click the Facility Metadata Export navicon.

2. In the Summary List – Facility Metadata Export screen (shown in Figure 92), click Export 

Facility Metadata.

Figure 91. Metadata report page

3. Check the box for each facility (or facilities) for which you wish to generate a report. Individual 

reports will be generated for each facility.

4. Click Next.

5. In the Summary page, confirm that the correct number of facilities is displayed and click Finish

to complete the wizard and begin export.

6. You will be taken to the Job Queue – Facility Metadata Export, which shows the progress of 

your export, as shown in Figure 93. When the export is completed, the Status of the export is 

updated to Complete, and the generated files can be downloaded.

Figure 92. Metadata export queue

7. In the Actions column of the table, you can click Files to view the exported file(s). 

8. Click Download in the Job Queue to save the file to your computer. 

The downloaded file is in a .zip format with an Excel spreadsheet that contains an export report and 

individual XML files for each facility.
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6 Documents

The Documents module allows you to access supplementary documentation, as well as any files 

uploaded into, downloaded from, or generated by the application.

6.1 Documents

Pathway: Documents > General

Click the Documents navicon to access the following features available in this section:

• Public Documents: Supplementary documentation uploaded by BOEM, such as the user guide. 

As an operator, you will not be able to manage files in this section, only view/download them.

• My Documents: Files imported into, exported from, or generated by the system. 

6.1.1 Public Documents

Pathway: Documents > General > Documents > Public Documents

On the Public Documents page, you will see a list of available supporting documentation (Figure 93).

Figure 93: Public Documents list

To view a document in the Public Documents section, click View in the Actions column (Figure 94). 

Figure 94. Documents in a set
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Click on the link in the Download column to access the individual documents within the group. In some 

cases, there may be only one document in the group.

The PDF files will be loaded into a viewer. Use the toolbar above the document to navigate between the 

pages. To download the document, select the download icon in the document viewer as shown in Figure 

95.

Figure 95. Document viewer

6.1.2 My Documents

Pathway: Documents > General > Documents > My Documents

OCS AQS keeps copies of all files imported, exported, and generated by the system. These files can be 

downloaded and reviewed at any time by going to the My Documents section of the Documents module

(Figure 96).

Figure 96. Documents – My Documents

The My Documents list displays all files that have been uploaded into the system, exported from the 

system, or generated by the system (Figure 97). 

IMPORTANT: The documents in this section are user-specific and are not visible to other users.
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Figure 97. My Documents list

Click the name link in the File column to download the file for review or click Delete in the Actions

column to remove the file from the records.

IMPORTANT: The file cannot be recovered after it has been deleted.
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7 Map

The OCS AQS Map module provides a graphical display of all georeferenced objects, such as platforms,

on a map of the Gulf of Mexico or Alaska regions for the inventory selected. It also allows you to display 

gridded emissions, custom shapefiles, and query the database to locate and display specific objects. When 

the Map module is first loaded, it will display a default view showing all facilities and release point 

available in the current inventory. 

An overview of features is shown in Figure 98.

Figure 98. Map features

The map includes the following elements:

1. Select Base Map: Expand to specify what background map overlay will be used.

2. Map Options: A collection of tools that allows you to navigate through various elements on the 

map and customize the map view. See below for the full list of available tools.

3. Scale Bar: Bar that displays relative scale of the map.

4. Main Map Window: Main map display.

5. Overview Map: Activates a minimap that shows the location currently displayed in the main 

window.

6. Zoom Controls: Slider that allows you to control the zoom level of the map.

7. Color Legend: Legend of the colors used by various elements displayed on the map.

IMPORTANT: The legend does not include colors of the base map or the location markers.

8. Location: Current coordinates of the tip of the mouse pointer.

You can move the map area by holding the cursor over the map and dragging it with the left mouse 

button. You can also zoom in and out using the mouse wheel.

The Map module also provides a number of useful tools that are accessed from the Viewer Toolbar. 

These options are summarized below, and their use is illustrated in the sections that follows in Table 6.
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Table 6. Viewer Toolbar tools

Icon Tool Description/Instructions

Layer Control Access different layers by selecting or de-selecting layer boxes.

Select Tool Pick a feature by clicking on it.

Zoom to Scenes Zoom to the extents of the layers currently selected (checked) in the 

Layer Control.

Zoom to Area Click and draw a rectangle on the map to set it as zoom extents.

Zoom to Location

Click this tool and then click on the map where you wish to center the 

zoom area to load the Zoom to Location dialog, where you can 

specify the exact location coordinates and the Zoom Radius.

Overview Map Click to activate a display of a map overview with a red rectangle

delineating the area currently being displayed on the map.

Measure Tool Measure the distance between two points by clicking on the points, or 

measure the area by defining a polygon.

Gridded Emissions Configure display of gridded emissions on the map (see Section 7.2)

Shapefile Layers Select a shapefile and an associated attribute to display it on the 

map.

Search Tool Search the map for objects containing a specified search string.

Lat/Long Grid Toggle display of meridians and parallels on and off.

7.1 Using the Map Module

The steps below will help illustrate the map functionalities summarized above:

IMPORTANT: The images displayed in this walkthrough will look different from the ones you 

see, because the displayed data is inventory specific.

1. Click the Map module (Figure 99). 

2. The map display appears automatically centered on the Gulf of Mexico. You can zoom and pan 

using the method described in the previous section. You can also use the various Zoom tools

available in the Map Options. 
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Figure 99. Map general view

3. In the Viewer Toolbar panel to the left of the map, click the Layer Control. This opens a dialog 

that shows a list of layers available in the map. Turn off all layers except the Facility layer and 

the Base Layers. For the Base Layers, you can click the + in the left-hand side to turn layers on 

and off, similar to what is shown in Figure 100. 

Figure 100. Layer Control

4. You can switch between Lakes Satellite and Open Street Map views here, but also by clicking 

on the > button (1 in Figure 100) in the upper left-hand. 

5. Take a moment to experiment with some of the other graphical tools in the Map Options such as 

the Select Tool, Zoom to Scenes, Zoom to Area, Measure Tool.

6. Under the Map Options, click Shapefile Layers. 

7. The Shapefile Layers dialog is displayed. This dialog lists shapefiles which have been imported 

into OCS AQS, as well as the corresponding map Layer Name. 

8. Within the dialog, click on the OPD Area shapefile layer and then click Apply as shown on 

Figure 101. When finished, close the dialog. 
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Figure 101. Display shapefile

9. The OPD areas are now visible on the map display. Additionally, the OPD Area map layer is 

now available in the Layer Control dialog (Figure 102). Move the cursor over OPD Area in the 

list of layers and several options are available to you to the right of the layer name in the list, 

including the Zoom to Scene option, which adjusts the zoom level of the map to fit the OPD 

Area shapefile comfortably into the map display area. 

Figure 102. OPD Area shapefile displayed

10. Close the Layer Control and Shapefile Layers dialogs if they are still open. 

11. Under the Map Options, click the Search Tool. 

12. The Search Tool dialog is displayed. Enter the name of a facility you know is in your inventory. 

The search tool will list all available facilities with that term in the name.

13. Highlight a facility entry in the list and click the button to zoom in to it as shown in Figure 

103.
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Figure 103. Using the Search Tool in Maps

7.2 Gridded Emissions

The Map module allows you to display gridded emissions based on the monthly reported values for all 

pollutants in the inventory.

1. Under the Map Options, select Gridded Emissions.

2. The Gridded Emissions dialog contains many different options and selections to allow you to 

graphically represent your emissions. These options are reviewed below: 

a. Emissions: Allows you to select the type of source that produced the emissions that will 

be displayed.

b. Grid Type: Gridded emissions can be graphed by Uniform Cells, OPD Area, or OCS 

Blocks. Select OCS Blocks. 

c. Cell Size (and Units): This allows you to determine the size of each cell if you selected 

Uniform Cells; otherwise, this field is disabled. 

d. Emission Units: Unit of measure to use for graphing the emissions. Select TONS. 

e. Pollutant Group: This option allows you to narrow down the list of pollutants to choose 

from.

f. Period Class: The period for which emissions are displayed. Select January. Note that 

this applies to active inventory year; since our example is an inventory in 2021, this 

means we will show emissions for January 2021. For an entire year, select January–

December.

g. Method: Determines if emissions are displayed on the map based on the facility location 

or the release point. This will often have little impact on results, but for some cases it can 

make a difference, especially when zoomed out. The recommended method is by Point 

of Release, as it attributes emissions produced by processes associated with a specific 

release point (source) as being emitted from the location of that source. Aggregating 

emissions by Facility will combine emissions from all sources at that facility at the 

coordinates assigned to that facility in the database.

h. # of Levels: Number of value ranges the emissions will be split into.

i. Equipment Type: Allows you to display/export gridded emissions produced by a 

specific type of equipment for example, by Combustion Flares.
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3. The bottom of the Gridded Emissions dialog shows a list of all available pollutants in the 

emissions inventory. For this exercise, select Carbon Monoxide (CO) in the table. You can only 

display gridded emissions for one pollutant at a time.

IMPORTANT: Depending on screen resolution, you might not see the table with pollutants. 

Scroll down in the Gridded Emissions dialog until you reach the table of pollutants.

IMPORTANT: If you do not see any pollutants in the table, check to see that the emissions have 

been calculated in the AEM.

4. Now that you have made your selections, click Apply above the table of pollutants and close the 

Gridded Emissions dialog by clicking [x] in the top right corner. While you do not have to close 

the dialog, it is big and obscures a large portion of the map.

5. The steps described above and the gridded emissions displayed as a result are shown in Figure 

105. At first the details can be hard to see; it will help to zoom in on the facility locations. 

6. After zooming in, it is easier to see the individual cells. Cells with no emissions have no coloring 

and simply show the base map (satellite or OpenStreetMaps). Cells with emissions are colored 

according to the color ramp at the bottom right of the map display. Notice that the cells which are 

colored correspond to the locations of facilities on the map (yellow markers), as would be 

expected. 

Figure 104. Map with gridded emissions

7. Take a moment to open the Gridded Emissions dialog and try out some of the other options 

available to you. 

8. To get the numerical values of the emissions on each grid cell, open the Gridded Emissions

dialog box and select Export (next to Apply). A Microsoft Excel file with the values will be 

downloaded automatically to your Download folder. The spreadsheet columns include the cell 

center coordinates in Latitude and Longitude and the cell grid emission value in the units 

selected.
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7.3 Displayed Feature Information

To get information on a facility, release point, or any displayed map feature, click on the Select Tool in 

the Map Options panel. After selection, click the feature you wish to examine. A box will appear with a 

list of items under the pointer as shown in Figure 105. Clicking will load the Details page for the 

selected item.

Figure 105. Select tool information

7.4 Additional Map Layers

Additional map layers can be added to the Map module by sending the appropriate SHP and SHX files to 

the BOEM OCS AQS administrator. Uploaded maps layers will be located under the Shapefile Layers

option of the map.
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8 Reports

OCS AQS comes with a set of report functions that can be customized by the operator using OCS AQS 

Reports wizards to produce a variety of summary and analysis reports. These reports can then be printed 

or exported into an external format for ease of distribution. 

8.1 Reports Overview

To generate a report, locate the report you would like to create in the Navigation Panel, click on it, and 

complete the wizard steps by selecting individual search criteria or all options. Run the report by clicking 

Finish and wait for the results; this may take a few seconds to a minute base on the amount of data in 

your inventory. 

All reports can be downloaded in a number of formats including

• XML

• Comma separated values (ASCII text)

• PDF

• MHTML

• MS Excel

• TIFF

• MS Word

A typical report showing the download icon is shown in Figure 106.

Figure 106. Report with download formats options
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8.2 Report Categories

The following sections describe various report categories found under the General section, All Reports

navicon. The reports in these categories can be also found under the corresponding sections on the same 

level as the General section. They are grouped by purpose under each heading and associated navicons.

8.2.1 Platforms Reports

Platforms reports section contains reports that provide non-emissions information regarding the sources. 

These include the facility structure and composition, complexes where they are located, and operating 

companies.

8.2.2 Platform Emissions Reports

Platform Emissions reports section contain reports that allow you to present emissions information in 

various ways. These reports allow you view results as overall totals, totals grouped by complex or facility, 

monthly totals, annual totals, totals grouped by equipment type, as well as a report listing all facilities that 

were set to “zero emissions” for at least part of the year.

8.2.3 Monthly Platform Emissions Reports

Monthly Platform Emissions reports section contains only reports pertaining to emissions generated by 

the facilities. Grouped by facility, complex, emission unit, or equipment type, this data can be presented 

in tabular or graph format.

8.2.4 Platform Emission Manager Reports

Platform Emission Manager reports allow you generate reports regarding non-emissions information 

related to the AEM for platform sources. This information includes the QA/QC comments entered for any 

parameters, any facilities or emission units set to “zero emissions” for at least part of the year, value 

ranges for parameter, comparison of calculator parameters month-to-month, and the flare gas volume 

emitted grouped by structure. 

8.2.5 GHG Emissions Reports

GHG Emissions reports allow you to view amounts of greenhouse gas emissions produced grouped by 

OPD area, structure, emission unit, and equipment type.

TIP: If the wizard asks to select an OPD, and you do not know which one to choose, select all 

and move to the next step. Sometimes it is easier to select by facility than OPD.

IMPORTANT: The GWP used to calculate the CO2e values are listed for each pollutant at the top 

of the table.

8.2.6 Lease Operation Reports

Lease Operation reports summarize emissions generated during lease operation activities.

8.2.7 Calculators Reports

Calculators reports describe the different calculation methods and input parameters used to calculate 

emissions. 
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8.2.8 Trend Analysis Reports

Trend Analysis reports allow you to observe emission trends over multiple inventory years in tabular or 

graphical format. 

8.2.9 Other Reports

Other reports refer to miscellaneous reports that did not fall into any specific category. 

8.2.10 Using Permalinks

OCS AQS allows the user to save a report query that can be used over or sent to a colleague (who has an 

OCS AQS account). After running the report, click on the Permalink shown in Figure 107.

Figure 107. Permalink location

Clicking on the Permalink will open a window with the URL of the report as shown in Figure 108. Copy 

the link and use it any time you want to re-run the report with the same parameters.

Figure 108. Permalink window
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9 Settings

The Settings module allows you to update system configuration for yourself as well as review activities 

under your account. The Navigation Panel provides links for User Options and Auditing sections.

9.1 User Options

Pathway: Settings > User Options

User Options section includes the ability to change the active inventory you are working in and manage 

system notifications as shown in Figure 109.

Figure 109. User Options page

9.1.1 Inventory Configuration

Pathway: Settings > User Options > Inventory Configuration

The Inventory Configuration page lists all inventories you have access to (Figure 110).

Figure 110. Inventory Configuration

IMPORTANT: The icon in the Access column means that the inventory is locked for editing. 

You can load this inventory and view its contents, but you will not be able to edit content, import 

new data, or run calculations.

From this screen you can:

• Click the link in the Inventory Name to load the inventory for viewing or editing, based on the 

access level.
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9.1.2 Notifications

Pathway: Settings > User Options > Notifications

The Notifications page lists results of a variety of cloud processes you initiated (Figure 111). 

Figure 111. User Notifications

The green notifications have been acknowledged, while pink notifications are new. New notifications are 

also shown as a number on the envelope notifications icon to the left of the user name – . To 

acknowledge notifications and marked them as “read”, check the box for each notification and click 

Acknowledge.

Here you can also specify how many notifications are shown when you click on the envelope button. To 

do so, click Settings, enter the desired number, and click Save (Figure 112).
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Figure 112. Notification Settings

9.2 Auditing

Pathway: Settings > Auditing

The Auditing section allows you to review the activities and change log that took place during login. The 

two available navicons are shown in Figure 113.

Figure 113. Auditing navicons

9.2.1 Account Activity

Pathway: Settings > Auditing > Account Activity

Account Activity displays a list of actions taken by you in the system.

Above the table you can find the following controls:

• Time Period: Set the time period for which you wish to view the activity. The default is Today.

• Default: This button resets the time period to the default setting.

• Update: This button refreshes the view.
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9.2.2 Change History Report

Pathway: Settings > Auditing > Change History Report

Change History report allows you to review any changes made to the data in any inventory accessible to 

you (Figure 114).

Figure 114. Change History report

Above the table you will find the following controls (Figure 115):

• Search: Search tool available for every list.

• User: Displays your user ID.

• Time Period: Set the time period for which you wish to view the change history. The default is 

Today.

• Default: This button resets the time period to the default setting.

• Update: This button refreshes the view.
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Figure 115. Change details
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Appendix A – Calculator Descriptions

A.1 AMI-000 (Amine Gas Sweetening Unit)

The hourly emission rates from the amine gas sweetening unit are calculated externally using the

AMINECalc calculator Version 1.0, and these emission rates are then imported into OCS AQS using the

Amine Emission Rates Import tool located in AEM section of the Emissions module. The calculator

AMI-000 Version 0 in OCS AQS calculates the monthly emissions from the amine gas sweetening unit

using the imported hourly emission rates and the following Data Request fields in Figure A - 1.

Figure A - 1. AMI-000 Data Request tab

1. Hours of Operation per Month [hr]: The total monthly hours of operation of the amine gas sweetening 

unit during this survey period.

2. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

3. Material Processed: A drop-down list field to specify the processed material: Natural Gas / Process

Gas.

4. Total Gas Throughput [MSCF/month]: The total volume of gas processed in this amine unit during 

the specific monthly survey period, volume adjusted to standard temperature and pressure.
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A.2 BOI-M01R (Boilers, Heaters, and Burners – Diesel)

The calculator BOI-M01R Version 4 in OCS AQS calculates the monthly emissions from a liquid-fueled 

unit powered by diesel using the following Data Request fields in Figure A - 2.

Figure A - 2. BOI-M01R Data Request tab

1. Total Fuel Usage [lb/month]: Total monthly rate of the liquid fuel used during the survey period.

2. Fuel Sulfur Content [wt%]: The weight percentage concentration of the sulfur content in the used 

liquid fuel. For example, if the fuel is 1.0% sulfur, then user enters 1 and not 0.01.

3. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to the system. Vented 

locally selection will compute the emissions vented from this unit. Whereas, flared locally, vented 

remotely, flared remotely, and routed to system selections will zero out emissions from this unit.

4. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil.

Default selection is Diesel.

5. Fuel Heating Value [Btu/lb]: The amount of heat released during the combustion of a specified 

amount of the liquid fuel. Default value is 19,300 Btu/lb.

6. Hours of Operation per Month [hr]: The total monthly hours of operation of the liquid-fueled unit

during the survey period.

7. Average Fuel Used [lb/hr]: The average hourly rate of the used liquid fuel during the survey period. 

This field is auto-calculated.

8. Max Rated Fuel Usage [lb/hr]: The maximum hourly usage rate of the liquid fuel.

9. Average Heat Input [MMBtu/hr]: The average hourly heat input rate of liquid fuel. This field is autocalculated.

10. Max Rated Heat Input Rate [MMBtu/hr]: The manufacturer’s maximum rated heat input rate of the 

liquid fuel.
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The calculator BOI-M01R Version 4 in OCS AQS calculates the monthly emissions with pollution 

control from a liquid-fueled unit powered by diesel using the following Control Request fields in Figure 

A - 3:

Figure A - 3. BOI-M01R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other to describe the type in the 

comments field.

2. Description of Control Equipment Chain: This field allows you to describe the control equipment 

chain if more than one type of technology is used.

3. Reduction Efficiency – Fine particulate matter (PM2.5) [%]: This describes the average reduction of 

emitted PM2.5 using the control technology. If the total reduction of PM2.5 using a vapor recovery unit 

is 65%, enter “65” in the field.

4. Reduction Efficiency – PM10 [%]: This describes the average reduction of emitted PM10 using the 

control technology. If the total reduction of PM10 using a vapor recovery unit is 65%, enter “65” in 

the field.

5. Reduction Efficiency – NOx [%]: This describes the average reduction of emitted NOx using the 

control technology. If the total reduction of NOx using a vapor recovery unit is 65%, enter “65” in the 

field.

6. Reduction Efficiency – N2O [%]: This describes the average reduction of emitted N2O using the 

control technology. If the total reduction of N2O using a vapor recovery unit is 65%, enter “65” in the 

field.

7. Reduction Efficiency – SOx [%]: This describes the average reduction of emitted SOx using the 

control technology. If the total reduction of SOx using a vapor recovery unit is 65%, enter “65” in the 

field.
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8. Reduction Efficiency – VOC [%]: This describes the average reduction of emitted VOC using the 

control technology. If the total reduction of VOC using a vapor recovery unit is 65%, enter “65” in 

the field.

9. Reduction Efficiency – CO [%]: This describes the average reduction of emitted CO using the control 

technology. If the total reduction of CO using a vapor recovery unit is 65%, enter “65” in the field.

10. Control Device?: Is a control device or end of pipe treatment included in the process? This is a 

Yes/No question.

11. Is a Factory Acceptance Test Certificate attached for primary control equipment?: A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.3 BOI-M02R (Boilers, Heaters, and Burners – Waste Oil)

The calculator BOI-M02R Version 3 in OCS AQS calculates the monthly emissions from a liquid-fueled 

unit powered by waste oil using the following Data Request fields in Figure A - 4:

Figure A - 4. BOI-M02R Data Request tab

1. Total Fuel Usage [lb/month]: Total monthly rate of the liquid fuel used during the survey period.

2. Fuel Sulfur Content [wt%]: The weight percentage concentration of the sulfur content in the used 

liquid fuel. For example, if the fuel is 1.0% sulfur, then user enters 1 and not 0.01.

3. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to the system. Vented 

locally selection will compute the emissions vented from this unit. Whereas, flared locally, vented 

remotely, flared remotely, and routed to system selections will zero out emissions from this unit.

4. Material Processed: A drop-down list field to specify the processed material: Crude Oil.

5. Fuel Heating Value [Btu/lb]: The amount of heat released during the combustion of a specified 

amount of the liquid fuel.

6. Hours of Operation per Month [hr]: The total monthly hours of operation of the liquid-fueled unit 

during the survey period.

7. Average Fuel Used [lb/hr]: The average hourly rate of liquid fuel used during the survey period. This 

field is auto-calculated.

8. Max Rated Fuel Usage [lb/hr]: The maximum hourly usage rate of the liquid fuel.

9. Average Heat Input [MMBtu/hr]: The average hourly heat input rate of liquid fuel. This field is autocalculated.
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10. Max Rated Heat Input Rate [MMBtu/hr]: The manufacturer’s maximum rated heat input rate of the 

liquid fuel.

The calculator BOI-M02R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from a liquid-fueled unit powered by waste oil using the following Control Request fields in 

Figure A - 5:

Figure A - 5. BOI-M02R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other to describe the type in the 

comments field.

2. Description of Control Equipment Chain: This field allows you to describe the control equipment 

chain if more than one type of technology is used.

3. Reduction Efficiency – PM2.5 [%]: This describes the average reduction of emitted PM2.5 using the 

control technology. If the total reduction of PM2.5 using a vapor recovery unit is 65%, enter “65” in 

the field.

4. Reduction Efficiency – PM10 [%]: This describes the average reduction of emitted PM10 using the 

control technology. If the total reduction of PM10 using a vapor recovery unit is 65%, enter “65” in 

the field.

5. Reduction Efficiency – NOx [%]: This describes the average reduction of emitted NOx using the 

control technology. If the total reduction of NOx using a vapor recovery unit is 65%, enter “65” in the 

field.

6. Reduction Efficiency – N2O [%]: This describes the average reduction of emitted N2O using the 

control technology. If the total reduction of N2O using a vapor recovery unit is 65%, enter “65” in the 

field.
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7. Reduction Efficiency – SOx [%]: This describes the average reduction of emitted SOx using the 

control technology. If the total reduction of SOx using a vapor recovery unit is 65%, enter “65” in the 

field.

8. Reduction Efficiency – VOC [%]: This describes the average reduction of emitted VOC using the 

control technology. If the total reduction of VOC using a vapor recovery unit is 65%, enter “65” in 

the field.

9. Reduction Efficiency – CO [%]: This describes the average reduction of emitted CO using the control 

technology. If the total reduction of CO using a vapor recovery unit is 65%, enter “65” in the field.

10. Control Device?: Is end of pipe control technology used with this source? A drop-down [Yes/No] list.

11. Is a Factory Acceptance Test Certificate attached for primary control equipment?: A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.4 BOI-M03R (Boilers, Heaters, and Burners – Natural Gas, Process Gas, 

or Waste Gas)

The calculator BOI-M03R Version 3 in OCS AQS calculates the monthly emissions from a gas-fueled 

unit powered by natural gas, process gas, or waste gas using the following Data Request fields in Figure 

A - 6:

Figure A - 6. BOI-M03R Data Request tab

1. Total Fuel Usage [Mscf/month]: Total monthly rate of the gas fuel used during the survey period.

2. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to the system. Vented 

locally selection will compute the emissions vented from this unit. Whereas, flared locally, vented 

remotely, flared remotely, and routed to system selections will zero out emissions from this unit.

3. Material Processed: A drop-down list field to specify the processed material: Natural Gas / Process 

Gas / Exhaust Gas.

4. Fuel Heating Value [Btu/scf]: The amount of heat released during the combustion of a specified 

amount of the gas fuel. Default value is 1050 Btu/scf.

5. Hours of Operation per Month [hr]: The total monthly hours of operation of the gas-fueled unit during 

the survey period.

6. Average Fuel Used [scf/hr]: The average hourly rate of gas fuel used during the survey period. This 

field is auto-calculated.

7. Max Rated Fuel Usage [scf/hr]: The maximum hourly usage rate of the gas fuel.

The calculator BOI-M03R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from a gas-fueled unit powered by natural gas, process gas, or waste gas using the following

Control Request fields in Figure A - 7:
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Figure A - 7. MOI-M03R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other to describe the type in the 

comments field.

2. Description of Control Equipment Chain: This field allows you to describe the control equipment 

chain if more than one type of technology is used.

3. Reduction Efficiency – PM2.5 [%]: This describes the average reduction of emitted PM2.5 using the 

control technology. If the total reduction of PM2.5 using a vapor recovery unit is 65%, enter “65” in 

the field.

4. Reduction Efficiency – PM10 [%]: This describes the average reduction of emitted PM10 using the 

control technology. If the total reduction of PM10 using a vapor recovery unit is 65%, enter “65” in 

the field.

5. Reduction Efficiency – NOx [%]: This describes the average reduction of emitted NOx using the 

control technology. If the total reduction of NOx using a vapor recovery unit is 65%, enter “65” in the 

field.

6. Reduction Efficiency – N2O [%]: This describes the average reduction of emitted N2O using the 

control technology. If the total reduction of N2O using a vapor recovery unit is 65%, enter “65” in the 

field.

7. Reduction Efficiency – SOx [%]: This describes the average reduction of emitted SOx using the 

control technology. If the total reduction of SOx using a vapor recovery unit is 65%, enter “65” in the 

field.

8. Reduction Efficiency – VOC [%]: This describes the average reduction of emitted VOC using the 

control technology. If the total reduction of VOC using a vapor recovery unit is 65%, enter “65” in 

the field.
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9. Reduction Efficiency – CO [%]: This describes the average reduction of emitted CO using the control 

technology. If the total reduction of CO using a vapor recovery unit is 65%, enter “65” in the field.

10. Control Device?: Is end of pipe control technology used with this source? A drop-down [Yes/No] list.

11. Is a Factory Acceptance Test Certificate attached for primary control equipment?: A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.5 DIE-M01R (Gasoline Engines)

The calculator DIE-M01R Version 3 in OCS AQS calculates the monthly emissions from a gasoline 

engine using the following Data Request fields in Figure A - 8:

Figure A - 8. DIE-M01R Data Request tab

1. Total Fuel Usage [gallons/month]: Total monthly rate of the gasoline fuel used during the survey 

period.

2. Fuel Heating Value [Btu/lb]: The amount of heat released during the combustion of a specified 

amount of the gasoline fuel. Default value is 20300 Btu/lb.

3. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to the system. Vented 

locally selection will compute the emissions vented from this unit. Whereas, flared locally, vented 

remotely, flared remotely, and routed to system selections will zero out emissions from this unit.

4. Material Processed: A drop-down list field to specify the processed material: Gasoline.

5. Hours of Operation per Month [hr]: The total monthly hours of operation of the unit during the survey 

period.

6. Operating Horsepower [hp]: The operating horsepower of the gasoline engine.

7. Max Rated Horsepower [hp]: The manufacturer’s maximum rated horsepower of the gasoline engine.

8. Max Rated Fuel Usage [Btu/hp-hr]: The maximum hourly usage rate of the gasoline fuel.

9. Average Fuel Used [Btu/hp-hr]: The average hourly rate of gasoline fuel used during the survey 

period. This field is auto-calculated.

The calculator DIE-M01R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from a gasoline engine using the following Control Request fields in Figure A - 9:
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114

Figure A - 9. DIE-M01R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other to describe the type in the 

comments field.

2. Description of Control Equipment Chain: This field allows you to describe the control equipment 

chain if more than one type of technology is used.

3. Reduction Efficiency – PM2.5 [%]: This describes the average reduction of emitted PM2.5 using the 

control technology. If the total reduction of PM2.5 using a vapor recovery unit is 65%, enter “65” in 

the field.

4. Reduction Efficiency – PM10 [%]: This describes the average reduction of emitted PM10 using the 

control technology. If the total reduction of PM10 using a vapor recovery unit is 65%, enter “65” in 

the field.

5. Reduction Efficiency – NOx [%]: This describes the average reduction of emitted NOx using the 

control technology. If the total reduction of NOx using a vapor recovery unit is 65%, enter “65” in the 

field.

6. Reduction Efficiency – SOx [%]: This describes the average reduction of emitted SOx using the 

control technology. If the total reduction of SOx using a vapor recovery unit is 65%, enter “65” in the 

field.

7. Reduction Efficiency – VOC [%]: This describes the average reduction of emitted VOC using the 

control technology. If the total reduction of VOC using a vapor recovery unit is 65%, enter “65” in 

the field.

8. Reduction Efficiency – CO [%]: This describes the average reduction of emitted CO using the control 

technology. If the total reduction of CO using a vapor recovery unit is 65%, enter “65” in the field.

9. Control Device?: Is end of pipe control technology used with this source? A drop-down [Yes/No] list.

10. Is a Factory Acceptance Test Certificate attached for primary control equipment?: A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.6 DIE-M02R (Diesel Engines, Max HP < 600)

The calculator DIE-M02R Version 4 in OCS AQS calculates the monthly emissions from a diesel engine

where Max HP < 600 using the following Data Request fields in Figure A - 10:

Figure A - 10. DIE-M02R Data Request tab

1. Total Fuel Usage [gallons/month]: Total monthly rate of the diesel fuel used during the survey period.

2. Fuel Heating Value [Btu/lb]: The amount of heat released during the combustion of a specified 

amount of the diesel fuel. Default value is 19300 Btu/lb.

3. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to the system. Vented 

locally selection will compute the emissions vented from this unit. Whereas, flared locally, vented 

remotely, flared remotely, and routed to system selections will zero out emissions from this unit.

4. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil.

5. Hours of Operation per Month [hr]: The total monthly hours of operation of the unit during the survey 

period.

6. Operating Horsepower [hp]: The operating horsepower of the diesel engine.

7. Max Rated Horsepower [hp]: The manufacturer’s maximum rated horsepower of the diesel engine.

8. Max Rated Fuel Usage [Btu/hp-hr]: The maximum hourly usage rate of the diesel fuel.

9. Average Fuel Used [Btu/hp-hr]: The average hourly rate of diesel fuel used during the survey period. 

This field is auto-calculated.

The calculator DIE-M02R Version 4 in OCS AQS calculates the monthly emissions with pollution 

control from a diesel engine where Max HP < 600 using the following Control Request fields in Figure 

A - 11:
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Figure A - 11. DIE-M02R Control Request tab.

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other to describe the type in the 

comments field.

2. Description of Control Equipment Chain: This field allows you to describe the control equipment 

chain if more than one type of technology is used.

3. Reduction Efficiency – PM2.5 [%]: This describes the average reduction of emitted PM2.5 using the 

control technology. If the total reduction of PM2.5 using a vapor recovery unit is 65%, enter “65” in 

the field.

4. Reduction Efficiency – PM10 [%]: This describes the average reduction of emitted PM10 using the 

control technology. If the total reduction of PM10 using a vapor recovery unit is 65%, enter “65” in 

the field.

5. Reduction Efficiency – NOx [%]: This describes the average reduction of emitted NOx using the 

control technology. If the total reduction of NOx using a vapor recovery unit is 65%, enter “65” in the 

field.

6. Reduction Efficiency – SOx [%]: This describes the average reduction of emitted SOx using the 

control technology. If the total reduction of SOx using a vapor recovery unit is 65%, enter “65” in the 

field.

7. Reduction Efficiency – VOC [%]: This describes the average reduction of emitted VOC using the 

control technology. If the total reduction of VOC using a vapor recovery unit is 65%, enter “65” in 

the field.

8. Reduction Efficiency – CO [%]: This describes the average reduction of emitted CO using the control 

technology. If the total reduction of CO using a vapor recovery unit is 65%, enter “65” in the field.

9. Control Device?: Is end of pipe control technology used with this source? A drop-down [Yes/No] list.

10. Is a Factory Acceptance Test Certificate attached for primary control equipment?: A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.7 DIE-M03R (Diesel Engines, Max HP >= 600)

The calculator DIE-M03R Version 4 in OCS AQS calculates the monthly emissions from a diesel engine 

where Max HP >= 600 using the following Data Request fields in Figure A - 12:

Figure A - 12. DIE-M03R Data Request tab

1. Total Fuel Usage [gallons/month]: Total monthly rate of the diesel fuel used during the survey period.

2. Fuel Heating Value [Btu/lb]: The amount of heat released during the combustion of a specified 

amount of the diesel fuel. Default value is 19300 Btu/lb.

3. Fuel Sulfur Content [wt%]: The weight percentage concentration of the sulfur content in the used 

diesel fuel. For example, if the fuel is 1.0% sulfur, then user enters 1 and not 0.01.

4. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to the system. Vented 

locally selection will compute the emissions vented from this unit. Whereas, flared locally, vented 

remotely, flared remotely, and routed to system selections will zero out emissions from this unit.

5. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil.

6. Hours of Operation per Month [hr]: The total monthly hours of operation of the unit during the survey 

period.

7. Operating Horsepower [hp]: The operating horsepower of the diesel engine.

8. Max Rated Horsepower [hp]: The manufacturer’s maximum rated horsepower of the diesel engine.

9. Max Rated Fuel Usage [Btu/hp-hr]: The maximum hourly usage rate of the diesel fuel.

10. Average Fuel Used [Btu/hp-hr]: The average hourly rate of diesel fuel used during the survey period. 

This field is auto-calculated.
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The calculator DIE-M03R Version 4 in OCS AQS calculates the monthly emissions with pollution 

control from a diesel engine where Max HP >= 600 using the following Control Request fields in Figure 

A - 13:

Figure A - 13. DIE-M03R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other to describe the type in the 

comments field.

2. Description of Control Equipment Chain: This field allows you to describe the control equipment 

chain if more than one type of technology is used.

3. Reduction Efficiency – PM2.5 [%]: This describes the average reduction of emitted PM2.5 using the 

control technology. If the total reduction of PM2.5 using a vapor recovery unit is 65%, enter “65” in 

the field.

4. Reduction Efficiency – PM10 [%]: This describes the average reduction of emitted PM10 using the 

control technology. If the total reduction of PM10 using a vapor recovery unit is 65%, enter “65” in 

the field.

5. Reduction Efficiency – NOx [%]: This describes the average reduction of emitted NOx using the 

control technology. If the total reduction of NOx using a vapor recovery unit is 65%, enter “65” in the 

field.

6. Reduction Efficiency – SOx [%]: This describes the average reduction of emitted SOx using the 

control technology. If the total reduction of SOx using a vapor recovery unit is 65%, enter “65” in the 

field.

7. Reduction Efficiency – VOC [%]: This describes the average reduction of emitted VOC using the 

control technology. If the total reduction of VOC using a vapor recovery unit is 65%, enter “65” in 

the field.

8. Reduction Efficiency – CO [%]: This describes the average reduction of emitted CO using the control 

technology. If the total reduction of CO using a vapor recovery unit is 65%, enter “65” in the field.
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119

9. Control Device?: Is end of pipe control technology used with this source? A drop-down [Yes/No] list.

10. Is a Factory Acceptance Test Certificate attached for primary control equipment?: A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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120

A.8 DRI-M01R (Drilling Equipment – Gasoline Fuel)

The calculator DRI-M01R Version 3 in OCS AQS calculates the monthly emissions from a drilling 

equipment powered by gasoline fuel using the following Data Request fields in Figure A - 14:

Figure A - 14. DRI-M01R Data Request tab

1. Total Fuel Usage [gallons/month]: Total monthly rate of the gasoline fuel used during the survey 

period.

2. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to the system. Vented 

locally selection will compute the emissions vented from this unit. Whereas, flared locally, vented 

remotely, flared remotely, and routed to system selections will zero out emissions from this unit.

3. Material processed: A drop-down list field to specify the processed material: Gasoline.

4. Hours of Operation per Month [hr]: The total monthly hours of operation of the unit during the survey 

period.

The calculator DRI-M01R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from a drilling equipment powered by gasoline fuel using the following Control Request fields in 

Figure A - 15:
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Figure A - 15. DRI-M01R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other to describe the type in the 

comments field.

2. Description of Control Equipment Chain: This field allows you to describe the control equipment 

chain if more than one type of technology is used.

3. Reduction Efficiency – PM2.5 [%]: This describes the average reduction of emitted PM2.5 using the 

control technology. If the total reduction of PM2.5 using a vapor recovery unit is 65%, enter “65” in 

the field.

4. Reduction Efficiency – PM10 [%]: This describes the average reduction of emitted PM10 using the 

control technology. If the total reduction of PM10 using a vapor recovery unit is 65%, enter “65” in 

the field.

5. Reduction Efficiency – NOx [%]: This describes the average reduction of emitted NOx using the 

control technology. If the total reduction of NOx using a vapor recovery unit is 65%, enter “65” in the 

field.

6. Reduction Efficiency – SOx [%]: This describes the average reduction of emitted SOx using the 

control technology. If the total reduction of SOx using a vapor recovery unit is 65%, enter “65” in the 

field.

7. Reduction Efficiency – VOC [%]: This describes the average reduction of emitted VOC using the 

control technology. If the total reduction of VOC using a vapor recovery unit is 65%, enter “65” in 

the field.

8. Reduction Efficiency – CO [%]: This describes the average reduction of emitted CO using the control 

technology. If the total reduction of CO using a vapor recovery unit is 65%, enter “65” in the field.

9. Control Device?: Is end of pipe control technology used with this source? A drop-down [Yes/No] list.

10. Is a Factory Acceptance Test Certificate attached for primary control equipment?: A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.9 DRI-M02R (Drilling Equipment – Diesel Fuel)

The calculator DRI-M02R Version 4 in OCS AQS calculates the monthly emissions from a drilling 

equipment powered by diesel fuel using the following Data Request fields in Figure A - 16:

Figure A - 16. DRI-M02R Data Request tab

1. Total Fuel Usage [gallons/month]: Total monthly rate of the diesel fuel used during the survey period.

2. Fuel Sulfur Content [wt%]: The weight percentage concentration of the sulfur content in the used 

diesel fuel. For example, if the fuel is 1.0% sulfur, then user enters 1 and not 0.01.

3. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to the system. Vented 

locally selection will compute the emissions vented from this unit. Whereas, flared locally, vented 

remotely, flared remotely, and routed to system selections will zero out emissions from this unit.

4. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil.

5. Hours of Operation per Month [hr]: The total monthly hours of operation of the unit during the survey 

period.

The calculator DRI-M02R Version 4 in OCS AQS calculates the monthly emissions with pollution 

control from a drilling equipment powered by diesel fuel using the following Control Request fields in 

Figure A - 17:
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123

Figure A - 17. DRI-M02R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other to describe the type in the 

comments field.

2. Description of Control Equipment Chain: This field allows you to describe the control equipment 

chain if more than one type of technology is used.

3. Reduction Efficiency – PM2.5 [%]: This describes the average reduction of emitted PM2.5 using the 

control technology. If the total reduction of PM2.5 using a vapor recovery unit is 65%, enter “65” in 

the field.

4. Reduction Efficiency – PM10 [%]: This describes the average reduction of emitted PM10 using the 

control technology. If the total reduction of PM10 using a vapor recovery unit is 65%, enter “65” in 

the field.

5. Reduction Efficiency – NOx [%]: This describes the average reduction of emitted NOx using the 

control technology. If the total reduction of NOx using a vapor recovery unit is 65%, enter “65” in the 

field.

6. Reduction Efficiency – SOx [%]: This describes the average reduction of emitted SOx using the 

control technology. If the total reduction of SOx using a vapor recovery unit is 65%, enter “65” in the 

field.

7. Reduction Efficiency – VOC [%]: This describes the average reduction of emitted VOC using the 

control technology. If the total reduction of VOC using a vapor recovery unit is 65%, enter “65” in 

the field.

8. Reduction Efficiency – CO [%]: This describes the average reduction of emitted CO using the control 

technology. If the total reduction of CO using a vapor recovery unit is 65%, enter “65” in the field.

9. Control Device?: Is end of pipe control technology used with this source? A drop-down [Yes/No] list.

10. Is a Factory Acceptance Test Certificate attached for primary control equipment?: A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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124

A.10DRI-M03R (Drilling Equipment – Natural Gas Fuel)

The calculator DRI-M03R Version 3 in OCS AQS calculates the monthly emissions from a drilling 

equipment powered by natural gas fuel using the following Data Request fields in Figure A - 18:

Figure A - 18. DRI-M03R Data Request tab

1. Total Fuel Usage [Mscf/month]: Total monthly rate of the natural gas fuel used during the survey 

period.

2. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to the system. Vented 

locally selection will compute the emissions vented from this unit. Whereas, flared locally, vented 

remotely, flared remotely, and routed to system selections will zero out emissions from this unit.

3. Material Processed: A drop-down list field to specify the processed material: Natural Gas/ Process 

Gas.

4. Hours of Operation per Month [hr]: The total monthly hours of operation of the unit during the survey 

period.

The calculator DRI-M03R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from a drilling equipment powered by natural gas fuel using the following Control Request fields

in Figure A - 19:
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125

Figure A - 19. DRI-M03R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other to describe the type in the 

comments field.

2. Description of Control Equipment Chain: This field allows you to describe the control equipment 

chain if more than one type of technology is used.

3. Reduction Efficiency – PM2.5 [%]: This describes the average reduction of emitted PM2.5 using the 

control technology. If the total reduction of PM2.5 using a vapor recovery unit is 65%, enter “65” in 

the field.

4. Reduction Efficiency – PM10 [%]: This describes the average reduction of emitted PM10 using the 

control technology. If the total reduction of PM10 using a vapor recovery unit is 65%, enter “65” in 

the field.

5. Reduction Efficiency – NOx [%]: This describes the average reduction of emitted NOx using the 

control technology. If the total reduction of NOx using a vapor recovery unit is 65%, enter “65” in the 

field.

6. Reduction Efficiency – SOx [%]: This describes the average reduction of emitted SOx using the 

control technology. If the total reduction of SOx using a vapor recovery unit is 65%, enter “65” in the 

field.

7. Reduction Efficiency – VOC [%]: This describes the average reduction of emitted VOC using the 

control technology. If the total reduction of VOC using a vapor recovery unit is 65%, enter “65” in 

the field.

8. Reduction Efficiency – CO [%]: This describes the average reduction of emitted CO using the control 

technology. If the total reduction of CO using a vapor recovery unit is 65%, enter “65” in the field.

9. Control Device?: Is end of pipe control technology used with this source? A drop-down [Yes/No] list.

10. Is a Factory Acceptance Test Certificate attached for primary control equipment?: A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.11FLA-M01 (Combustion Flare)

The calculator FLA-M01 Version 3 in OCS AQS calculates the monthly emissions from a combustion 

flare using the following Data Request fields in Figure A - 20:

Figure A - 20. FLA-M01 Data Request tab

1. Total Volume of Gas Flared (Not Including Pilot) [Mscf]: The total volume of flare gas during the 

survey period, without the pilot flared gas. 

2. Smoking Condition: A drop-down list field to specify the condition of the flare emitted smoke: No 

Smoke / Light Smoke / Medium Smoke / Heavy Smoke.

3. Concentration of H2S in the Flare Gas [ppm]: The ppm concentration of hydrogen sulfide present in 

the flare gas.

4. Flare Gas Heating Value [Btu/scf]: The amount of heat released during the combustion of a specified 

amount of the flare gas.

5. Combustion Efficiency of the Flare [%]: The percentage efficiency of complete combustion, or the 

percentage of hydrocarbon conversion to carbon dioxide (CO2). 

6. Material Processed: A drop-down list field to specify the processed material: Gas/ Natural Gas / 

Process Gas / Exhaust gas.

7. Hours of Operation per Month [hr]: The total monthly hours of operation of the unit during the survey 

period.

8. Average flaring rate [Mscf/hr]. The flaring hourly volumetric rate. This field is auto-calculated.
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127

A.12FLA-M02 (Combustion Flares – Pilot)

The calculator FLA-M02 Version 3 in OCS AQS calculates the monthly emissions from a pilot

combustion flare using the following Data Request fields in Figure A - 21:

Figure A - 21. FLA-M02 Data Request tab

1. Pilot Feed Rate [Mscf/day]: Daily volumetric flowrate of gas fed to the pilot. 

2. Number of Days in Month [Day]: The number of days in the month of the survey period.

3. Material Processed: A drop-down list field to specify the processed material: Gas / Natural Gas / 

Process Gas / Exhaust gas.
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A.13FUG-M01 (Fugitive Sources – Gas)

The calculator FUG-M01 Version 2 in OCS AQS calculates the monthly emissions from the gas fugitive 

sources using the following Data Request fields in Figure A - 22:

Figure A - 22. FUG-M01 Data Request tab
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129

1. Total Number of Components (Specify by Type Below): The summation of the number of 

components. This field is auto-calculated based on the number of components provided in the 

subsequent fields. 

2. Number of Connectors: Total number of connectors in the structure.

3. Number of Flanges: Total number of flanges in this structure.

4. Number of Open-Ended Lines: Total number of open-ended lines in the structure.

5. Number of Pump Seals: Total number of pump seals in this structure.

6. Number of Valves: Total number of valves in this structure.

7. Number of Centrifugal Compressors – Dry Seals: Total number of dry seals centrifugal compressors 

the structure.

8. Number of Centrifugal Compressors – Wet Seals: Total number of wet seals centrifugal compressors 

the structure.

9. Reciprocating Compressor – Shaft Packing Seals: Total number of shaft packing seals reciprocating 

compressors. 

10. Number of Other Compressors – Seals: Total number of other compressors in the structure.

11. Number of Other Relief Valves: Total number of other relief valves in the structure.

12. Number of Pressure Relief Valves: Total number of pressure relief valves in the structure.

13. Number of Meters: Total number of meters in the structure.

14. Number of Instruments: Total number of instruments in the structure.

15. Number of Hatches: Total number of hatches in the structure.

16. Number of Polished Rods: Total number of polished rods in the structure.

17. Number of Dumps: Total number of dumps in the structure.

18. Number of Drains: Total number of drains in the structure.

19. Number of Diaphragms: Total number of diaphragms in the structure.

20. Number of Operating Days in Month [Days]: The total number of days that the fugitive source 

operated during the survey period.

21. Are Component Counts Based on Default Values? [Default/Actual]: Identifies whether a facilityspecific component count is provided, or default values provided by BOEM are used. Default set to 

Default. Default components are given as: 

Connectors: 9,194

Valves: 1,713

Open-Ends: 285

Others: 228

22. LDAR is in Place?: A Yes/No drop-down list field to indicate whether the facility routinely assesses 

and repairs leaking fugitive components or not.

23. Inspection Method: A drop-down list field to specify the employed inspection method: Optical 

Instrumentation / Visual Inspection / Vapor Analyzer.

24. Number of Months Between Inspections [Months]: The LDAR program inspection frequency.

25. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil / 

Gas / Gasoline / Natural Gas / Process Gas / Crude Oil / Condensate / Exhaust gas.
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A.14FUG-M02 (Fugitive Sources – Liquid Natural Gas)

The calculator FUG-M02 Version 2 in OCS AQS calculates the monthly emissions from the liquid 

natural gas fugitive sources using the following Data Request fields in Figure A - 23:

Figure A - 23. FUG-M02 Data Request tab
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1. Total Number of Components (Specify by Type Below): The summation of number of components 

This field is auto-calculated based on the number of components provided in the following fields. 

2. Number of Connectors: Total number of connectors in the structure.

3. Number of Flanges: Total number of flanges in this structure.

4. Number of Open-Ended Lines: Total number of open-ended lines in the structure.

5. Number of Pump Seals: Total number of pump seals in this structure.

6. Number of Valves: Total number of valves in this structure.

7. Number of Centrifugal Compressors – Dry Seals: Total number of dry seals centrifugal compressors 

the structure.

8. Number of Centrifugal Compressors – Wet Seals: Total number of wet seals centrifugal compressors 

the structure.

9. Reciprocating Compressor – Shaft Packing Seals: Total number of shaft packing seals reciprocating 

compressors. 

10. Number of Other Compressors – Seals: Total number of other compressors in the structure.

11. Number of Other Relief Valves: Total number of other relief valves in the structure.

12. Number of Pressure Relief Valves: Total number of pressure relief valves in the structure.

13. Number of Meters: Total number of meters in the structure.

14. Number of Instruments: Total number of instruments in the structure.

15. Number of Hatches: Total number of hatches in the structure.

16. Number of Polished Rods: Total number of polished rods in the structure.

17. Number of Dumps: Total number of dumps in the structure.

18. Number of Drains: Total number of drains in the structure.

19. Number of Diaphragms: Total number of diaphragms in the structure.

20. Number of Operating Days in Month [Days]: The total number of days that the fugitive source 

operated during the survey period.

21. Are Component Counts Based on Default Values? [Default/Actual]: Identifies whether a facilityspecific component count is provided, or default values provided by BOEM are used. Default set to 

Default. Default components are given as: 

Connectors: 9,194

Valves: 1,713

Open-Ends: 285

Others: 228

22. LDAR is in Place?: A Yes/No drop-down list field to indicate whether the facility routinely assesses 

and repairs leaking fugitive components or not.

23. Inspection Method: A drop-down list field to specify the employed inspection method: Optical 

Instrumentation / Visual Inspection / Vapor Analyzer.

24. Number of Months Between Inspections [Months]: The LDAR program inspection frequency.

25. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil / 

Gas / Gasoline / Natural Gas / Process Gas / Crude Oil / Condensate / Exhaust gas.
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A.15FUG-M03 (Fugitive Sources – Heavy Oil)

The calculator FUG-M03 Version 2 in OCS AQS calculates the monthly emissions from the heavy oil 

fugitive sources using the following Data Request fields in Figure A - 24:

Figure A - 24. FUG-M03 Data Request tab
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1. Total Number of Components (Specify by Type Below): The summation of number of components 

This field is auto-calculated based on the number of components provided in the following fields. 

2. Number of Connectors: Total number of connectors in the structure.

3. Number of Flanges: Total number of flanges in this structure.

4. Number of Open-Ended Lines: Total number of open-ended lines in the structure.

5. Number of Pump Seals: Total number of pump seals in this structure.

6. Number of Valves: Total number of valves in this structure.

7. Number of Centrifugal Compressors – Dry Seals: Total number of dry seals centrifugal compressors 

the structure.

8. Number of Centrifugal Compressors – Wet Seals: Total number of wet seals centrifugal compressors 

the structure.

9. Reciprocating Compressor – Shaft Packing Seals: Total number of shaft packing seals reciprocating 

compressors. 

10. Number of Other Compressors – Seals: Total number of other compressors in the structure.

11. Number of Other Relief Valves: Total number of other relief valves in the structure.

12. Number of Pressure Relief Valves: Total number of pressure relief valves in the structure.

13. Number of Meters: Total number of meters in the structure.

14. Number of Instruments: Total number of instruments in the structure.

15. Number of Hatches: Total number of hatches in the structure.

16. Number of Polished Rods: Total number of polished rods in the structure.

17. Number of Dumps: Total number of dumps in the structure.

18. Number of Drains: Total number of drains in the structure.

19. Number of Diaphragms: Total number of diaphragms in the structure.

20. Number of Operating Days in Month [Days]: The total number of days that the fugitive source 

operated during the survey period.

21. Are Component Counts Based on Default Values? [Default/Actual]: Identifies whether a facilityspecific component count is provided, or default values provided by BOEM are used. Default set to 

Default. Default components are given as:

Connectors: 9,194

Valves: 1,713

Open-Ends: 285

Others: 228

22. LDAR is in Place?: A Yes/No drop-down list field to indicate whether the facility routinely assesses 

and repairs leaking fugitive components or not.

23. Inspection Method: A drop-down list field to specify the employed inspection method: Optical 

Instrumentation / Visual Inspection / Vapor Analyzer.

24. Number of Months Between Inspections [Months]: The LDAR program inspection frequency.

25. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil / 

Gas / Gasoline / Natural Gas / Process Gas / Crude Oil / Condensate / Exhaust gas.
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A.16FUG-M04 (Fugitive Sources –Light Oil)

The calculator FUG-M04 Version 2 in OCS AQS calculates the monthly emissions from the light oil 

fugitive sources using the following Data Request fields in Figure A - 25:

Figure A - 25. FUG-M04 Data Request tab
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1. Total Number of Components (Specify by Type Below): The summation of number of components 

This field is auto-calculated based on the number of components provided in the following fields. 

2. Number of Connectors: Total number of connectors in the structure.

3. Number of Flanges: Total number of flanges in this structure.

4. Number of Open-Ended Lines: Total number of open-ended lines in the structure.

5. Number of Pump Seals: Total number of pump seals in this structure.

6. Number of Valves: Total number of valves in this structure.

7. Number of Centrifugal Compressors – Dry Seals: Total number of dry seals centrifugal compressors 

the structure.

8. Number of Centrifugal Compressors – Wet Seals: Total number of wet seals centrifugal compressors 

the structure.

9. Reciprocating Compressor – Shaft Packing Seals: Total number of shaft packing seals reciprocating 

compressors. 

10. Number of Other Compressors – Seals: Total number of other compressors in the structure.

11. Number of Other Relief Valves: Total number of other relief valves in the structure.

12. Number of Pressure Relief Valves: Total number of pressure relief valves in the structure.

13. Number of Meters: Total number of meters in the structure.

14. Number of Instruments: Total number of instruments in the structure.

15. Number of Hatches: Total number of hatches in the structure.

16. Number of Polished Rods: Total number of polished rods in the structure.

17. Number of Dumps: Total number of dumps in the structure.

18. Number of Drains: Total number of drains in the structure.

19. Number of Diaphragms: Total number of diaphragms in the structure.

20. Number of Operating Days in Month [Days]: The total number of days that the fugitive source 

operated during the survey period.

21. Are Component Counts Based on Default Values? [Default/Actual]: Identifies whether a facilityspecific component count is provided, or default values provided by BOEM are used. Default set to 

Default. Default components are given as: 

Connectors: 9,194

Valves: 1,713

Open-Ends: 285

Others: 228

22. LDAR is in Place?: A Yes/No drop-down list field to indicate whether the facility routinely assesses 

and repairs leaking fugitive components or not.

23. Inspection Method: A drop-down list field to specify the employed inspection method: Optical 

Instrumentation / Visual Inspection / Vapor Analyzer.

24. Number of Months Between Inspections [Months]: The LDAR program inspection frequency.

25. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil / 

Gas / Gasoline / Natural Gas / Process Gas / Crude Oil / Condensate / Exhaust gas.
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A.17FUG-M05 (Fugitive Sources – Water / Oil)

The calculator FUG-M05 Version 2 in OCS AQS calculates the monthly emissions from the water / oil 

fugitive sources using the following Data Request fields in Figure A - 26:

Figure A - 26. FUG-M05 Data Request tab
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1. Total Number of Components (Specify by Type Below): The summation of number of components 

This field is auto-calculated based on the number of components provided in the following fields. 

2. Number of Connectors: Total number of connectors in the structure.

3. Number of Flanges: Total number of flanges in this structure.

4. Number of Open-Ended Lines: Total number of open-ended lines in the structure.

5. Number of Pump Seals: Total number of pump seals in this structure.

6. Number of Valves: Total number of valves in this structure.

7. Number of Centrifugal Compressors – Dry Seals: Total number of dry seals centrifugal compressors 

the structure.

8. Number of Centrifugal Compressors – Wet Seals: Total number of wet seals centrifugal compressors 

the structure.

9. Reciprocating Compressor – Shaft Packing Seals: Total number of shaft packing seals reciprocating 

compressors. 

10. Number of Other Compressors – Seals: Total number of other compressors in the structure.

11. Number of Other Relief Valves: Total number of other relief valves in the structure.

12. Number of Pressure Relief Valves: Total number of pressure relief valves in the structure.

13. Number of Meters: Total number of meters in the structure.

14. Number of Instruments: Total number of instruments in the structure.

15. Number of Hatches: Total number of hatches in the structure.

16. Number of Polished Rods: Total number of polished rods in the structure.

17. Number of Dumps: Total number of dumps in the structure.

18. Number of Drains: Total number of drains in the structure.

19. Number of Diaphragms: Total number of diaphragms in the structure.

20. Number of Operating Days in Month [Days]: The total number of days that the fugitive source 

operated during the survey period.

21. Are Component Counts Based on Default Values? [Default/Actual]: Identifies whether a facilityspecific component count is provided, or default values provided by BOEM are used. Default set to 

Default. Default components are given as: 

Connectors: 9,194

Valves: 1,713

Open-Ends: 285

Others: 228

22. LDAR is in Place?: A Yes/No drop-down list field to indicate whether the facility routinely assesses 

and repairs leaking fugitive components or not.

23. Inspection Method: A drop-down list field to specify the employed inspection method: Optical 

Instrumentation / Visual Inspection / Vapor Analyzer.

24. Number of Months Between Inspections [Months]: The LDAR program inspection frequency.

25. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil / 

Gas / Gasoline / Natural Gas / Process Gas / Crude Oil / Condensate / Exhaust gas.
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A.18FUG-M06 (Fugitive Sources – Water / Oil / Gas)

The calculator FUG-M06 Version 2 in OCS AQS calculates the monthly emissions from the water / oil / 

gas fugitive sources using the following Data Request fields in Figure A - 27:

Figure A - 27. FUG-M06 Data Request tab
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1. Total Number of Components (Specify by Type Below): The summation of number of components 

This field is auto-calculated based on the number of components provided in the following fields. 

2. Number of Connectors: Total number of connectors in the structure.

3. Number of Flanges: Total number of flanges in this structure.

4. Number of Open-Ended Lines: Total number of open-ended lines in the structure.

5. Number of Pump Seals: Total number of pump seals in this structure.

6. Number of Valves: Total number of valves in this structure.

7. Number of Centrifugal Compressors – Dry Seals: Total number of dry seals centrifugal compressors 

the structure.

8. Number of Centrifugal Compressors – Wet Seals: Total number of wet seals centrifugal compressors 

the structure.

9. Reciprocating Compressor – Shaft Packing Seals: Total number of shaft packing seals reciprocating 

compressors. 

10. Number of Other Compressors – Seals: Total number of other compressors in the structure.

11. Number of Other Relief Valves: Total number of other relief valves in the structure.

12. Number of Pressure Relief Valves: Total number of pressure relief valves in the structure.

13. Number of Meters: Total number of meters in the structure.

14. Number of Instruments: Total number of instruments in the structure.

15. Number of Hatches: Total number of hatches in the structure.

16. Number of Polished Rods: Total number of polished rods in the structure.

17. Number of Dumps: Total number of dumps in the structure.

18. Number of Drains: Total number of drains in the structure.

19. Number of Diaphragms: Total number of diaphragms in the structure.

20. Number of Operating Days in Month [Days]: The total number of days that the fugitive source 

operated during the survey period.

21. Are Component Counts Based on Default Values? [Default/Actual]: Identifies whether a facilityspecific component count is provided, or default values provided by BOEM are used. Default set to 

Default. Default components are given as: 

Connectors: 9,194

Valves: 1,713

Open-Ends: 285

Others: 228

22. LDAR is in Place?: A Yes/No drop-down list field to indicate whether the facility routinely assesses 

and repairs leaking fugitive components or not.

23. Inspection Method: A drop-down list field to specify the employed inspection method: Optical 

Instrumentation / Visual Inspection / Vapor Analyzer.

24. Number of Months Between Inspections [Months]: The LDAR program inspection frequency.

25. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil / 

Gas / Gasoline / Natural Gas / Process Gas / Crude Oil / Condensate / Exhaust gas.
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A.19GLY-000 (Glycol Dehydrator Unit)

The hourly emission rates from the glycol dehydrator unit are calculated externally using GRI-GLYCalc 

Version 4.0. These emission rates are then imported into OCS AQS using the Glycol Emission Rates 

Import tool located in the AEM section of the Emissions module. The calculator GLY-000 Version 0 in 

OCS AQS calculates the monthly emissions from the glycol dehydrator unit using the imported emission 

rates and the following Data Request fields in Figure A - 28:

Figure A - 28. GLY-000 Data Request tab

1. Hours of Operation per Month [hr]: The total monthly hours of operation of the glycol dehydrator 

unit during this survey period.

2. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

3. Material Processed: A drop-down list field to specify the processed material: Natural Gas.

4. Total Throughput [Mscf/month]: The total volume of gas processed in this glycol dehydrator unit 

during the specific monthly survey period, volume adjusted to standard temperature and pressure (60 

degrees Fahrenheit, 1 atmosphere).
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A.20LOA-M01R (Loading Operations)

The calculator LOA-M01R Version 3 in OCS AQS calculates the monthly emissions from the loading 

operations using the following Data Request fields in Figure A - 29:

Figure A - 29. LOA-M01R Data Request tab

1. Total Barrels Transferred per Month [bbl]: The number of barrels of liquid hydrocarbons transferred / 

loaded per month. 

2. Storage Tank Paint Color: A drop-down list field to specify the exterior paint color of the dispensing 

storage tank: Aluminum or Specular / Aluminum or Diffuse / Grey or Light / Grey or Medium / Red 

or Primer / White.

3. Storage Tank Paint Condition: A drop-down list field to specify the exterior paint condition of the 

dispensing storage tank: Good / Poor / Average.

4. Reid Vapor Pressure [psia]: The Reid vapor pressure of the liquid in the dispensing storage tank.

5. VOC Tank Vapor Weight Percent [wt%]: The weight percentage concentration of the vapor VOC in 

the dispensing storage tank.

6. Average Molecular Weight of Vapors [lb/lb-mol]: The average molecular weight of the vapor VOC 

present in the dispensing storage tank.

7. Daily Average Ambient Temperature [deg F]: The daily average ambient temperature.

8. Liquid Bulk Temperature [deg F]: The bulk temperature of the liquid in the dispensing storage tank.
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9. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

10. Material Processed: A drop-down list field to specify the processed material: Crude Oil.

11. Hours of Operation per Month [hr]: The total monthly hours of loading operations during this survey 

period.

The calculator LOA-M01R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from the loading operations using the following Control Request fields in Figure A - 30:

Figure A - 30. LOA-M01R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other and explain in the comments field.

2. Description of Control Equipment Chain: If more than one type of control technology is used, user 

can describe the sequence of processing in this field.

3. Reduction Efficiency [%]: This term describes the reduction of all emitted constituents of the 

emission stream using the control technology. For example, if a Vapor Unit Recovery is employed 

with a 90% reduction efficiency, the user enters “90” in the “Reduction Efficiency [%]” field. After 

the calculation is executed, all the emitted constituents will be reduced uniformly by 90%.

4. Control Device?: Is end of pipe control technology used with this source? A drop-down [Yes/No] list.

5. Is a Factory Acceptance Test Certificate attached for primary control equipment?: A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.21LOS-M01R (Losses from Flashing)

The calculator LOS-M01R Version 4 in OCS AQS calculates the monthly emitted losses from flashing 

using the following Data Request fields in Figure A - 31:

Figure A - 31. LOS-M01R Data Request tab

1. Throughput Volume per Month [bbl]: The total volume of the material processed in the vessel during 

the specific monthly survey period.

2. Atmospheric Pressure [psia]: The atmospheric pressure. Default value is 14.7 pisa.

3. Upstream Operating Pressure [psig]: Operating pressure of the upstream vessel.

4. Upstream Operating Temperature [deg F]: Operating temperature of the upstream vessel.

5. Downstream / Vessel Operating Pressure [psig]: Operating pressure of the downstream / vessel where 

the flashing takes place. 

6. Downstream /Vessel Operating Temperature [deg F]: Operating temperature of the downstream / 

vessel where the flashing takes place. 

7. API Gravity: The API gravity of the oil/condensate in the vessel where the flashing takes place.

8. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

9. Material Processed: A drop-down list field to specify the processed material: Crude Oil / Condensate.
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10. Hours of Operation per Month [hr]: The total monthly hours of flashing operations during this survey 

period.

11. Type of Vessel: A drop-down list field to specify the type of vessel: Heater Treater / Separator / 

Storage Tank / Surge Tank / Other.

The calculator LOS-M01R Version 4 in OCS AQS the monthly losses emitted from flashing with 

pollution control using the following Control Request fields in Figure A - 32:

Figure A - 32. LOS-M01R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other and explain in the comments field.

2. Description of Control Equipment Chain: If more than one type of control technology is used, user 

can describe the sequence of processing in this field.

3. Reduction Efficiency [%]: This term describes the reduction of all emitted constituents of the 

emission stream using the control technology. For example, if a Vapor Unit Recovery is employed 

with a 90% reduction efficiency, the user enters “90” in the “Reduction Efficiency [%]” field. After 

the calculation is executed, all the emitted constituents will be reduced uniformly by 90%.

4. Control Device? – Is end of pipe control technology used with this source? A drop-down [Yes/No] 

list.

5. Is a Factory Acceptance Test Certificate attached for primary control equipment? – A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.22MUD-M01 (Mud Degassing)

The calculator MUD-M01 Version 2 in OCS AQS calculates the monthly emissions from the mud 

degassing operation using the following Data Request fields in Figure A - 33:

Figure A - 33. MUD-M01 Data Request tab

1. Days per Month of Drilling with Mud [Days]: The total number of 24-hour days of drilling with mud

during the specific monthly survey period.

2. Type of Mud: A drop-down list field to specify the type of drilling mud: Water-based Mud / Oilbased Mud / Synthetic.

3. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

4. Material Processed: The type of fuel burned in the equipment: Gas / Natural Gas.

5. Hours of Operation per Month [hr]: The total monthly hours of mud degassing operations during this 

survey period. This field is auto-calculated.
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A.23NGE-M01R (Natural Gas Engine – Engine Stroke Cycle = 2-Cycle and 

Engine Burn = Lean)

The calculator NGE-M01R Version 3 in OCS AQS calculates the monthly emissions from a natural gas 

engine with two engine cycle stroke and lean engine burn using the following Data Request fields in 

Figure A - 34:

Figure A - 34. NGE-M01R Data Request tab

1. Total Fuel Usage [Mscf/month]: Total monthly rate of the gas fuel used during the survey period.

2. Fuel Heating Value [Btu/scf]: The amount of heat released during the combustion of a specified 

amount of the natural gas fuel. Default value is 1050 Btu/scf.

3. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

4. Material Processed: A drop-down list field to specify the processed material: Natural Gas / Process 

Gas.

5. Fuel H2S Content [ppmv]: The ppmv concentration of hydrogen sulfide present in natural gas fuel.

6. Hours of Operation per Month [hr]: The total monthly hours of operation of the engine during the 

survey period.

7. Average Fuel Used [Mscf/hr]: The average hourly rate of natural gas fuel used during the survey 

period. This field is auto-calculated.
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8. Operating Horsepower [hp]: The operating horsepower of the natural gas engine.

9. Max Rated Horsepower [hp]: The manufacturer’s maximum rated horsepower the natural gas engine.

10. Max Rated Fuel Usage [Btu/hp-hr]: The maximum hourly usage rate of the gas fuel.

11. Manufacturer: A drop-down list field to specify the engines' manufacturer name.

12. Model Number: The model number of the engine. 

The calculator NGE-M01R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from a natural gas engine with two engine cycle stroke and lean engine burn using the following 

Control Request fields in Figure A - 35:

Figure A - 35. NGE-M01R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other to describe the type in the 

comments field.

2. Description of Control Equipment Chain: This field allows you to describe the control equipment 

chain if more than one type of technology is used.

3. Reduction Efficiency – PM2.5 [%]: This describes the average reduction of emitted PM2.5 using the 

control technology. If the total reduction of PM2.5 using a vapor recovery unit is 65%, enter “65” in 

the field.

4. Reduction Efficiency – PM10 [%]: This describes the average reduction of emitted PM10 using the 

control technology. If the total reduction of PM10 using a vapor recovery unit is 65%, enter “65” in 

the field.

5. Reduction Efficiency – NOx [%]: This describes the average reduction of emitted NOx using the 

control technology. If the total reduction of NOx using a vapor recovery unit is 65%, enter “65” in the 

field.
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6. Reduction Efficiency – SOx [%]: This describes the average reduction of emitted SOx using the 

control technology. If the total reduction of SOx using a vapor recovery unit is 65%, enter “65” in the 

field.

7. Reduction Efficiency – VOC [%]: This describes the average reduction of emitted VOC using the 

control technology. If the total reduction of VOC using a vapor recovery unit is 65%, enter “65” in 

the field.

8. Reduction Efficiency – CO [%]: This describes the average reduction of emitted CO using the control 

technology. If the total reduction of CO using a vapor recovery unit is 65%, enter “65” in the field.

9. Control Device?: Is end of pipe control technology used with this source? A drop-down [Yes/No] list.

10. Is a Factory Acceptance Test Certificate attached for primary control equipment?: A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.24NGE-M02R (Natural Gas Engine – Engine Stroke Cycle = 4-Cycle and 

Engine Burn = Lean)

The calculator NGE-M02R Version 4 in OCS AQS calculates the monthly emissions from a natural gas 

engine with four engine cycle stroke and lean engine burn using the following Data Request fields in 

Figure A - 36:

Figure A - 36. NGE-M02R Data Request tab

1. Total Fuel Usage [Mscf/month]: Total monthly rate of the gas fuel used during the survey period.

2. Fuel Heating Value [Btu/scf]: The amount of heat released during the combustion of a specified 

amount of the natural gas fuel. Default value is 1050 Btu/scf.

3. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

4. Material Processed: A drop-down list field to specify the processed material: Natural Gas / Process 

Gas.

5. Fuel H2S Content [ppmv]: The ppmv concentration of hydrogen sulfide present in natural gas fuel.

6. Hours of Operation per Month [hr]: The total monthly hours of operation of the engine during the 

survey period.

7. Average Fuel Used [Mscf/hr]: The average hourly rate of natural gas fuel used during the survey 

period. This field is auto-calculated.
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8. Operating Horsepower [hp]: The operating horsepower of the natural gas engine.

9. Max Rated Horsepower [hp]: The manufacturer’s maximum rated horsepower of the natural gas 

engine. 

10. Max Rated Fuel Usage [Btu/hp-hr]: The maximum hourly usage rate of the gas fuel.

11. Manufacturer: A drop-down list field to specify the engines' manufacturer name.

12. Model Number: The model number of the engine. 

The calculator NGE-M02R Version 4 in OCS AQS calculates the monthly emissions with pollution 

control from a natural gas engine with four engine cycle stroke and lean engine burn using the following 

Control Request fields in Figure A - 37:

Figure A - 37. NGE-M02R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other to describe the type in the 

comments field.

2. Description of Control Equipment Chain: This field allows you to describe the control equipment 

chain if more than one type of technology is used.

3. Reduction Efficiency – PM2.5 [%]: This describes the average reduction of emitted PM2.5 using the 

control technology. If the total reduction of PM2.5 using a vapor recovery unit is 65%, enter “65” in 

the field.

4. Reduction Efficiency – PM10 [%]: This describes the average reduction of emitted PM10 using the 

control technology. If the total reduction of PM10 using a vapor recovery unit is 65%, enter “65” in 

the field.

5. Reduction Efficiency – NOx [%]: This describes the average reduction of emitted NOx using the 

control technology. If the total reduction of NOx using a vapor recovery unit is 65%, enter “65” in the 

field.
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6. Reduction Efficiency – SOx [%]: This describes the average reduction of emitted SOx using the 

control technology. If the total reduction of SOx using a vapor recovery unit is 65%, enter “65” in the 

field.

7. Reduction Efficiency – VOC [%]: This describes the average reduction of emitted VOC using the 

control technology. If the total reduction of VOC using a vapor recovery unit is 65%, enter “65” in 

the field.

8. Reduction Efficiency – CO [%]: This describes the average reduction of emitted CO using the control 

technology. If the total reduction of CO using a vapor recovery unit is 65%, enter “65” in the field.

9. Control Device?: Is end of pipe control technology used with this source? A drop-down [Yes/No] list.

10. Is a Factory Acceptance Test Certificate attached for primary control equipment?: A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.25NGE-M03R (Natural Gas Engine – Engine Stroke Cycle = 4-Cycle and 

Engine Burn = Rich)

The calculator NGE-M03R Version 3 in OCS AQS calculates the monthly emissions from a natural gas 

engine with four engine cycle stroke and rich engine burn using the following Data Request fields in 

Figure A - 38:

Figure A - 38. NGE-M03R Data Request tab

1. Total Fuel Usage [Mscf/month]: Total monthly rate of the gas fuel used during the survey period.

2. Fuel Heating Value [Btu/scf]: The amount of heat released during the combustion of a specified 

amount of the natural gas fuel. Default value is 1050 Btu/scf.

3. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

4. Material Processed: A drop-down list field to specify the processed material: Natural Gas / Process 

Gas.

5. Fuel H2S Content [ppmv]: The ppmv concentration of hydrogen sulfide present in natural gas fuel.

6. Hours of Operation per Month [hr]: The total monthly hours of operation of the engine during the 

survey period.

7. Average Fuel Used [Mscf/hr]: The average hourly rate of natural gas fuel used during the survey 

period. This field is auto-calculated.
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8. Operating Horsepower [hp]: The operating horsepower of the engine.

9. Max rated horsepower [hp]: The manufacturer’s maximum rated horsepower of the engine. 

10. Max Rated Fuel Usage [Btu/hp-hr]: The maximum hourly usage rate of the gas fuel.

11. Manufacturer: A drop-down list field to specify the engines' manufacturer name.

12. Model Number: The model number of the engine. 

The calculator NGE-M03R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from a natural gas engine with four engine cycle stroke and rich engine burn using the following 

Control Request fields in Figure A - 39:

Figure A - 39. NGE-M03R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other and explain and describe the type 

in the comments field.

2. Description of Control Equipment Chain: This field allows you to describe the control equipment 

chain if more than one type of technology is used.

3. Reduction Efficiency – PM2.5 [%]: This describes the average reduction of emitted PM2.5 using the 

control technology. If the total reduction of PM2.5 using a vapor recovery unit is 65%, enter “65” in 

the field.

4. Reduction Efficiency – PM10 [%]: This describes the average reduction of emitted PM10 using the 

control technology. If the total reduction of PM10 using a vapor recovery unit is 65%, enter “65” in 

the field.

5. Reduction Efficiency – NOx [%]: This describes the average reduction of emitted NOx using the 

control technology. If the total reduction of NOx using a vapor recovery unit is 65%, enter “65” in the 

field.
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6. Reduction Efficiency – SOx [%]: This describes the average reduction of emitted SOx using the 

control technology. If the total reduction of SOx using a vapor recovery unit is 65%, enter “65” in the 

field.

7. Reduction Efficiency – VOC [%]: This describes the average reduction of emitted VOC using the 

control technology. If the total reduction of VOC using a vapor recovery unit is 65%, enter “65” in 

the field.

8. Reduction Efficiency – CO [%]: This describes the average reduction of emitted CO using the control 

technology. If the total reduction of CO using a vapor recovery unit is 65%, enter “65” in the field.

9. Control Device?: Is end of pipe control technology used with this source? A drop-down [Yes/No] list.

10. Is a Factory Acceptance Test Certificate attached for primary control equipment?: A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.

A.26NGE-M04R (Natural Gas Engine – Engine Burn =clean)

The calculator NGE-M04R Version 3 in OCS AQS calculates the monthly emissions from a natural gas 

engine with clean engine burn using the following Data Request fields in Figure A - 40:

Figure A - 40. NGE-M04R Data Request tab
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1. Total Fuel Usage [Mscf/month]: Total monthly rate of the gas fuel used during the survey period.

2. Fuel Heating Value [Btu/scf]: The amount of heat released during the combustion of a specified 

amount of the natural gas fuel. Default value is 1050 Btu/scf.

3. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

4. Material Processed: A drop-down list field to specify the processed material: Natural Gas / Process 

Gas.

5. Fuel H2S Content [ppmv]: The ppmv concentration of hydrogen sulfide present in natural gas fuel.

6. Hours of Operation per Month [hr]: The total monthly hours of operation of the engine during the 

survey period.

7. Average Fuel Used [Mscf/hr]: The average hourly rate of natural gas fuel used during the survey 

period. This field is auto-calculated.

8. Operating Horsepower [hp]: The operating horsepower of the engine.

9. Max Rated Horsepower [hp]: The manufacturer’s maximum rated horsepower of the engine. 

10. Max Rated Fuel Usage [Btu/hp-hr]: The maximum hourly usage rate of the gas fuel.

11. Manufacturer: A drop-down list field to specify the engines' manufacturer name.

12. Model Number: The model number of the engine. 

The calculator NGE-M04R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from a natural gas engine with clean engine burn using the following Control Request fields in 

Figure A - 41:

Figure A - 41. NGE-M04R Control Request tab
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1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other and explain and describe the type 

in the comments field.

2. Description of Control Equipment Chain: This field allows you to describe the control equipment 

chain if more than one type of technology is used.

3. Reduction Efficiency – PM2.5 [%]: This describes the average reduction of emitted PM2.5 using the 

control technology. If the total reduction of PM2.5 using a vapor recovery unit is 65%, enter “65” in 

the field.

4. Reduction Efficiency – PM10 [%]: This describes the average reduction of emitted PM10 using the 

control technology. If the total reduction of PM10 using a vapor recovery unit is 65%, enter “65” in 

the field.

5. Reduction Efficiency – NOx [%]: This describes the average reduction of emitted NOx using the 

control technology. If the total reduction of NOx using a vapor recovery unit is 65%, enter “65” in the 

field.

6. Reduction Efficiency – SOx [%]: This describes the average reduction of emitted SOx using the 

control technology. If the total reduction of SOx using a vapor recovery unit is 65%, enter “65” in the 

field.

7. Reduction Efficiency – VOC [%]: This describes the average reduction of emitted VOC using the 

control technology. If the total reduction of VOC using a vapor recovery unit is 65%, enter “65” in 

the field.

8. Reduction Efficiency – CO [%]: This describes the average reduction of emitted CO using the control 

technology. If the total reduction of CO using a vapor recovery unit is 65%, enter “65” in the field.

9. Control Device?: Is end of pipe control technology used with this source? A drop-down [Yes/No] list.

10. Is a Factory Acceptance Test Certificate attached for primary control equipment?: A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.27NGT-M01R (Dual-Fuel Turbines – Nat. Gas – Known Sulfur)

The calculator NGT-M01R Version 3 in OCS AQS calculates the monthly emissions from a dual-fuel 

turbine powered by natural gas with known sulfur content using the following Data Request fields in 

Figure A - 42:

Figure A - 42. NGT-M01R Data Request tab

1. Total Fuel Usage [Mscf/month]: Total monthly rate of the natural gas fuel used during the survey 

period.

2. Fuel Sulfur Content [wt%]: The weight percentage of the sulfur content in the used natural gas fuel. 

For example, if the fuel is 1.0% sulfur, then user enters 1 and not 0.01.

3. Fuel Heating Value [Btu/scf]: The amount of heat released during the combustion of a specified 

amount of the natural gas fuel. Default value is 1050 Btu/scf.

4. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

5. Material Processed: A drop-down list field to specify the processed material: Natural Gas / Process 

Gas.

6. Hours of Operation per Month [hr]: The total monthly hours of operation of the turbine during the 

survey period.

7. Average Fuel Used [Mscf/hr]: The average hourly rate of natural gas fuel used during the survey 

period. This field is auto-calculated.

8. Operating Horsepower [hp]: The operating horsepower of the turbine.

9. Max Rated Horsepower [hp]: The manufacturer’s maximum rated horsepower of the turbine. 
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10. Max Rated Fuel Usage [Btu/hp-hr]: The maximum hourly usage rate of the gas fuel.

The calculator NGT-M01R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from a dual-fuel turbine powered by natural gas with known sulfur content using the following 

Control Request fields in Figure A - 43:

Figure A - 43. NGT-M01R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other and explain and describe the type 

in the comments field.

2. Description of Control Equipment Chain: This field allows you to describe the control equipment 

chain if more than one type of technology is used.

3. Reduction Efficiency – PM2.5 [%]: This describes the average reduction of emitted PM2.5 using the 

control technology. If the total reduction of PM2.5 using a vapor recovery unit is 65%, enter “65” in 

the field.

4. Reduction Efficiency – PM10 [%]: This describes the average reduction of emitted PM10 using the 

control technology. If the total reduction of PM10 using a vapor recovery unit is 65%, enter “65” in 

the field.

5. Reduction Efficiency – NOx [%]: This describes the average reduction of emitted NOx using the 

control technology. If the total reduction of NOx using a vapor recovery unit is 65%, enter “65” in the 

field.

6. Reduction Efficiency – N2O [%]: This describes the average reduction of emitted N2O using the 

control technology. If the total reduction of N2O using a vapor recovery unit is 65%, enter “65” in the 

field.
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7. Reduction Efficiency – SOx [%]: This describes the average reduction of emitted SOx using the 

control technology. If the total reduction of SOx using a vapor recovery unit is 65%, enter “65” in the 

field.

8. Reduction Efficiency – VOC [%]: This describes the average reduction of emitted VOC using the 

control technology. If the total reduction of VOC using a vapor recovery unit is 65%, enter “65” in 

the field.

9. Reduction Efficiency – CO [%]: This describes the average reduction of emitted CO using the control 

technology. If the total reduction of CO using a vapor recovery unit is 65%, enter “65” in the field.

10. Control Device? – Is end of pipe control technology used with this source? A drop-down [Yes/No] 

list.

11. Is a Factory Acceptance Test Certificate attached for primary control equipment?: A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.

A.28NGT-M02R (Dual-Fuel Turbines – Nat. Gas – Unknown Sulfur)

The calculator NGT-M02R Version 3 in OCS AQS calculates the monthly emissions from a dual-fuel 

turbine powered by natural gas with unknown sulfur content using the following Data Request fields in 

Figure A - 44:

Figure A - 44. NGT-M02R Data Request tab

1. Total Fuel Usage [Mscf/month]: Total monthly rate of the gas fuel used during the survey period.

2. Fuel Heating Value [Btu/scf]: The amount of heat released during the combustion of a specified 

amount of the natural gas fuel. Default value is 1050 Btu/scf.
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3. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

4. Material Processed: A drop-down list field to specify the processed material: Natural Gas / Process 

Gas.

5. Hours of Operation per Month [hr]: The total monthly hours of operation of the turbine during the 

survey period.

6. Average Fuel Used [Mscf/hr]: The average hourly rate of natural gas fuel used during the survey 

period. This field is auto-calculated.

7. Operating Horsepower [hp]: The operating horsepower of the turbine.

8. Max Rated Horsepower [hp]: The manufacturer’s maximum rated horsepower of the turbine. 

9. Max Rated Fuel Usage [Btu/hp-hr]: The maximum hourly usage rate of the gas fuel.

The calculator NGT-M02R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from a dual-fuel turbine powered by natural gas with unknown sulfur content using the following 

Control Request fields in Figure A - 45:

Figure A - 45. NGT-M02R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other and explain and describe the type 

in the comments field.

2. Description of Control Equipment Chain: This field allows you to describe the control equipment 

chain if more than one type of technology is used.
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3. Reduction Efficiency – PM2.5 [%]: This describes the average reduction of emitted PM2.5 using the 

control technology. If the total reduction of PM2.5 using a vapor recovery unit is 65%, enter “65” in 

the field.

4. Reduction Efficiency – PM10 [%]: This describes the average reduction of emitted PM10 using the 

control technology. If the total reduction of PM10 using a vapor recovery unit is 65%, enter “65” in 

the field.

5. Reduction Efficiency – NOx [%]: This describes the average reduction of emitted NOx using the 

control technology. If the total reduction of NOx using a vapor recovery unit is 65%, enter “65” in the 

field.

6. Reduction Efficiency – N2O [%]: This describes the average reduction of emitted N2O using the 

control technology. If the total reduction of N2O using a vapor recovery unit is 65%, enter “65” in the 

field.

7. Reduction Efficiency – SOx [%]: This describes the average reduction of emitted SOx using the 

control technology. If the total reduction of SOx using a vapor recovery unit is 65%, enter “65” in the 

field.

8. Reduction Efficiency – VOC [%]: This describes the average reduction of emitted VOC using the 

control technology. If the total reduction of VOC using a vapor recovery unit is 65%, enter “65” in 

the field.

9. Reduction Efficiency – CO [%]: This describes the average reduction of emitted CO using the control 

technology. If the total reduction of CO using a vapor recovery unit is 65%, enter “65” in the field.

10. Control Device?: Is end of pipe control technology used with this source? A drop-down [Yes/No] list.

11. Is a Factory Acceptance Test Certificate attached for primary control equipment?: drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.29NGT-M03R (Dual-Fuel Turbines – Diesel)

The calculator NGT-M03R Version 3 in OCS AQS calculates the monthly emissions from a dual turbine 

powered by diesel using the following Data Request fields in Figure A - 46:

Figure A - 46. NGT-M03R Data Request tab

1. Total Fuel Usage [gallons/month]: Total monthly rate of the diesel fuel used during the survey period.

2. Fuel Sulfur Content [wt%]: The weight percentage of the sulfur content in the used diesel fuel. For 

example, if the fuel is 1.0% sulfur, then user enters 1 and not 0.01.

3. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

4. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil.

5. Hours of Operation per Month [hr]: The total monthly hours of operation of the turbine during the 

survey period.

6. Average Fuel Used [gallons/hr]: The average hourly rate of diesel fuel used during the survey period. 

This field is auto-calculated.

7. Operating Horsepower [hp]: The operating horsepower of the turbine.

8. Max Rated Horsepower [hp]: The manufacturer’s maximum rated horsepower of the turbine. 

9. Max Rated Fuel Usage [Btu/hp-hr]: The maximum hourly usage rate of the diesel fuel.
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The calculator NGT-M03R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from a dual turbine powered by diesel using the following Control Request fields in Figure A -

47:

Figure A - 47. NGT-M03R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other and explain and describe the type 

in the comments field.

2. Description of Control Equipment Chain: This field allows you to describe the control equipment 

chain if more than one type of technology is used.

3. Reduction Efficiency – PM2.5 [%]: This describes the average reduction of emitted PM2.5 using the 

control technology. If the total reduction of PM2.5 using a vapor recovery unit is 65%, enter “65” in 

the field.

4. Reduction Efficiency – PM10 [%]: This describes the average reduction of emitted PM10 using the 

control technology. If the total reduction of PM10 using a vapor recovery unit is 65%, enter “65” in 

the field.

5. Reduction Efficiency – NOx [%]: This describes the average reduction of emitted NOx using the 

control technology. If the total reduction of NOx using a vapor recovery unit is 65%, enter “65” in the 

field.

6. Reduction Efficiency – SOx [%]: This describes the average reduction of emitted SOx using the 

control technology. If the total reduction of SOx using a vapor recovery unit is 65%, enter “65” in the 

field.

7. Reduction Efficiency – VOC [%]: This describes the average reduction of emitted VOC using the 

control technology. If the total reduction of VOC using a vapor recovery unit is 65%, enter “65” in 

the field.

8. Reduction Efficiency – CO [%]: This describes the average reduction of emitted CO using the control 

technology. If the total reduction of CO using a vapor recovery unit is 65%, enter “65” in the field.
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9. Control Device?: Is end of pipe control technology used with this source? A drop-down [Yes/No] list.

10. Is a Factory Acceptance Test Certificate attached for primary control equipment?: A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.30PNE-M01R (Pneumatic Pumps)

The calculator PNE-M01R Version 3 in OCS AQS calculates the monthly emissions from a pneumatic 

pump using the following Data Request fields in Figure A - 48: 

Figure A - 48. PNE-M01R Data Request tab

1. Hours of Operation per Month [hr]: The total monthly hours of operation of the pneumatic pump 

during the survey period.

2. Fuel Usage Rate [scf/hr]: Average hourly rate of the fuel used during the survey period.

3. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

4. Material Processed: A drop-down list field to specify the processed material: Natural Gas / Process 

Gas.

5. Manufacturer: A drop-down list field to specify the pump's manufacturer name.

6. Model: The model of the pump. 

7. Total Fuel Usage Per Device [scf/month]: Total gaseous fuel used per device during this survey 

period. This field is auto-calculated.
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The calculator PNE-M01R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from a pneumatic pump using the following Control Request fields in Figure A - 49:

Figure A - 49. PNE-M01R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other and explain in the comments field.

2. Description of Control Equipment Chain: If more than one type of control technology is used, user 

can describe the sequence of processing in this field.

3. Reduction Efficiency [%]: This term describes the reduction of all emitted constituents of the 

emission stream using the control technology. For example, if a Vapor Unit Recovery is employed 

with a 90% reduction efficiency, the user enters “90” in the “Reduction Efficiency [%]” field. After 

the calculation is executed, all the emitted constituents will be reduced uniformly by 90%.

4. Control Device? – Is end of pipe control technology used with this source? A drop-down [Yes/No] 

list.

5. Is a Factory Acceptance Test Certificate attached for primary control equipment? – A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.31PRE-M01R (Pneumatic Controllers)

The calculator PRE-M01R Version 3 in OCS AQS calculates the monthly emissions from a pneumatic 

controller using the following Data Request fields in Figure A - 50: 

Figure A - 50. PRE-M01R Data Request tab

1. Number of Units: Number of pneumatic controllers in the structure.

2. Hours of Operation per Month [hr]: The total monthly hours of operation of the controller during the 

survey period.

3. Fuel Usage Rate [scf/hr]: Average hourly rate of the fuel used during the survey period.

4. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

5. Material Processed: A drop-down list field to specify the processed material: Natural Gas / Process 

Gas.

6. Service Type: A drop-down list field to specify the service type of the controller: Pressure Controller

/ Level Controller / Flow Controller / Other.

7. Manufacturer: A drop-down list field to specify the controllers' manufacturer name.

8. Model: The model of the controller. 

9. Bleed Rate: A drop-down list field to specify the bleed rate type of the controller: High-bleed 

(>6scfh) / Intermittent / Low-bleed (<6scfh) / Zero-bleed.

10. Total Fuel Usage Per Device [scf/month]: Total gaseous fuel per device used during this survey 

period. This field is auto-calculated.
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The calculator PRE-M01R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from a pneumatic controller using the following Control Request fields in Figure A - 51:

Figure A - 51. PRE-M01R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other and explain in the comments field.

2. Description of Control Equipment Chain: If more than one type of control technology is used, user 

can describe the sequence of processing in this field.

3. Reduction Efficiency [%]: This term describes the reduction of all emitted constituents of the 

emission stream using the control technology. For example, if a Vapor Unit Recovery is employed 

with a 90% reduction efficiency, the user enters “90” in the “Reduction Efficiency [%]” field. After 

the calculation is executed, all the emitted constituents will be reduced uniformly by 90%.

4. Control Device? – Is end of pipe control technology used with this source? A drop-down [Yes/No] 

list.

5. Is a Factory Acceptance Test Certificate attached for primary control equipment? – A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.32STO-M01R (Storage Tank – Horizontal, Rectangular Tank)

The calculator STO-M01R Version 3 in OCS AQS calculates the monthly emissions from an uninsulated

horizontal rectangular storage tank using the following Data Request fields in Figure A - 52: 

Figure A - 52. STO-M01R Data Request tab

1. Monthly Net Throughput [bbl]: The total monthly throughput volumetric flow rate fed to the storage 

tank during the survey period.

2. Number of Days in Month [days/month]: Number of days in the month of the survey period. 

3. Reid Vapor Pressure [psia]: The Reid vapor pressure of the liquid mixture in the storage tank.

4. Average Daily Maximum Ambient Temperature [deg F]: The average daily maximum ambient 

temperature.

5. Average Daily Minimum Ambient Temperature [deg F]: The average daily minimum ambient 

temperature.

6. Liquid Bulk Temperature [deg F]: The bulk temperature of the liquid mixture in the storage tank.

7. Vapors Molecular Weight [lb/lb-mol]: The average molecular weight of the vapor phase VOCs 

mixture in the storage tank.

8. Paint Color: A drop-down list field to specify the exterior paint color of the storage tank: Aluminum 

or Specular / Aluminum or Diffuse / Grey or Light / Grey or Medium / Red or Primer / White.

9. Paint Condition: A drop-down list field to specify the exterior paint condition of the storage tank: 

Good / Poor / Average.

10. Tank Shell Length [ft]: The longest horizontal dimension of a horizontal rectangular storage tank. 
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11. Tank Shell Height [ft]: The vertical height of the rectangular tank.

12. Tank Shell Width [ft]: The horizontal width of a rectangular tank.

13. Tank Average Liquid Height [ft]: The average height of stored liquid during the survey period, 

measured from the bottom of the storage space to the top of the liquid.

14. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

15. Material Processed: A drop-down list field to specify the processed material: Distillate Oil / Crude Oil 

/ Condensate / Other.
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The calculator STO-M01R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from an uninsulated horizontal rectangular storage tank using the following Control Request

fields in Figure A - 53:

Figure A - 53. STO-M01R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other and explain in the comments field.

2. Description of Control Equipment Chain: If more than one type of control technology is used, user 

can describe the sequence of processing in this field.

3. Reduction Efficiency [%]: This term describes the reduction of all emitted constituents of the 

emission stream using the control technology. For example, if a Vapor Unit Recovery is employed 

with a 90% reduction efficiency, the user enters “90” in the “Reduction Efficiency [%]” field. After 

the calculation is executed, all the emitted constituents will be reduced uniformly by 90%.

4. Control Device? – Is end of pipe control technology used with this source? A drop-down [Yes/No] 

list.

5. Is a Factory Acceptance Test Certificate attached for primary control equipment? – A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.33STO-M02R (Storage Tank – Vertical, Rectangular Tank)

The calculator STO-M02R Version 3 in OCS AQS calculates the monthly emissions from uninsulated

vertical rectangular storage tank using the following Data Request fields in Figure A - 54: 

Figure A - 54. STO-M02R Data Request tab

1. Monthly Net Throughput [bbl]: The total monthly throughput volumetric flow rate in the storage tank 

during the survey period.

2. Number of Days in Month [days/month]: Number of days in the month of the survey period. 

3. Reid Vapor Pressure [psia]: The Reid vapor pressure of the liquid mixture in the storage tank.

4. Average Daily Maximum Ambient Temperature [deg F]: The average daily maximum ambient 

temperature.
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5. Average Daily Minimum Ambient Temperature [deg F]: The average daily minimum ambient 

temperature.

6. Liquid Bulk Temperature [deg F]: The bulk temperature of the liquid mixture in the storage tank.

7. Vapors Molecular Weight [lb/lb-mol]: The average molecular weight of the vapor phase of the VOCs 

mixture in the storage tank.

8. Paint Color: A drop-down list field to specify the exterior paint color of the storage tank: Aluminum 

or Specular / Aluminum or Diffuse / Grey or Light / Grey or Medium / Red or Primer / White.

9. Paint Condition: A drop-down list field to specify the exterior paint condition of the storage tank: 

Good / Poor / Average.

10. Horizontal Width of a Rectangular Tank (Oriented Vertically) [ft]: The first horizontal width of a 

rectangular tank.

11. Tank Shell Height [ft]: The vertical height of the rectangular tank.

12. Second Horizontal Width of a Rectangular Tank (Oriented Vertically) [ft]: The second horizontal 

width of a rectangular tank.

13. Tank Average Liquid Height [ft]: The average height of stored liquid during the survey period, 

measured from the bottom of the storage space to the top of the liquid.

14. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

15. Material Processed: A drop-down list field to specify the processed material: Distillate Oil (Diesel) /

Crude Oil / Condensate / Other.
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The calculator STO-M02R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from an uninsulated vertical rectangular storage tank using the following Control Request fields

in Figure A - 55:

Figure A - 55. STO-M02R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other and explain in the comments field.

2. Description of Control Equipment Chain: If more than one type of control technology is used, user 

can describe the sequence of processing in this field.

3. Reduction Efficiency [%]: This term describes the reduction of all emitted constituents of the 

emission stream using the control technology. For example, if a Vapor Unit Recovery is employed 

with a 90% reduction efficiency, the user enters “90” in the “Reduction Efficiency [%]” field. After 

the calculation is executed, all the emitted constituents will be reduced uniformly by 90%.

4. Control Device? – Is end of pipe control technology used with this source? A drop-down [Yes/No] 

list.

5. Is a Factory Acceptance Test Certificate attached for primary control equipment? – A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.34STO-M03R (Storage Tank – Horizontal, Cylindrical Tank)

The calculator STO-M03R Version 3 in OCS AQS calculates the monthly emissions from an uninsulated

horizontal cylindrical storage tank using the following Data Request fields in Figure A - 56: 

Figure A - 56. STO-M03R Data Request tab

1. Monthly Net Throughput [bbl]: The total monthly throughput volumetric flow rate fed to the storage 

tank during the survey period.

2. Number of Days in Month [days/month]: Number of days in the month of the survey period. 

3. Reid Vapor Pressure [psia]: The Reid vapor pressure of the liquid mixture in the storage tank.

4. Average Daily Maximum Ambient Temperature [deg F]: The average daily maximum ambient 

temperature.

5. Average Daily Minimum Ambient Temperature [deg F]: The average daily minimum ambient 

temperature.

6. Liquid Bulk Temperature [deg F]: The bulk temperature of the liquid mixture in the storage tank.

7. Vapors Molecular Weight [lb/lb-mol]: The average molecular weight of the vapor phase of the VOCs 

mixture in the storage tank.

8. Paint Color: A drop-down list field to specify the exterior paint color of the storage tank: Aluminum 

or Specular / Aluminum or Diffuse / Grey or Light / Grey or Medium / Red or Primer / White.
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9. Paint Condition: A drop-down list field to specify the exterior paint condition of the storage tank: 

Good / Poor / Average.

10. Tank Shell Length [ft]: The shell horizontal length of the horizontal cylindrical storage tank.

11. Tank Shell Diameter [ft]: The shell diameter of the cylindrical storage tank. 

12. Tank Average Liquid Height [ft]: The average height of stored liquid during the survey period, 

measured from the bottom of the storage space to the top of the liquid.

13. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

16. Material Processed: A drop-down list field to specify the processed material: Distillate Oil (Diesel) 

/Crude Oil / Condensate / Other.

The calculator STO-M03R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from an uninsulated horizonal cylindrical storage tank using the following Control Request fields

in Figure A - 57:

Figure A - 57. STO-M03R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other and explain in the comments field.

2. Description of Control Equipment Chain: If more than one type of control technology is used, user 

can describe the sequence of processing in this field.

3. Reduction Efficiency [%]: This term describes the reduction of all emitted constituents of the 

emission stream using the control technology. For example, if a Vapor Unit Recovery is employed 

with a 90% reduction efficiency, the user enters “90” in the “Reduction Efficiency [%]” field. After 

the calculation is executed, all the emitted constituents will be reduced uniformly by 90%.

4. Control Device? – Is end of pipe control technology used with this source? A drop-down [Yes/No] 

list.

5. Is a Factory Acceptance Test Certificate attached for primary control equipment? – A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.35STO-M04R (Storage Tank – Vertical, Cylindrical Tank)

The calculator STO-M04R Version 3 in OCS AQS calculates the monthly emissions from an uninsulated

vertical cylindrical storage tank using the following Data Request fields in Figure A - 58: 

Figure A - 58. STO-M04R Data Request tab

1. Monthly Net Throughput [bbl]: The total monthly throughput volumetric flow rate fed to the storage 

tank during the survey period.

2. Number of Days in Month [days/month]: Number of days in the month of the survey period. 

3. Reid Vapor Pressure [psia]: The Reid vapor pressure of the liquid mixture in the storage tank.

4. Average Daily Maximum Ambient Temperature [deg F]: The average daily maximum ambient 

temperature.
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5. Average Daily Minimum Ambient Temperature [deg F]: The average daily minimum ambient 

temperature.

6. Liquid Bulk Temperature [deg F]: The bulk temperature of the liquid mixture in the storage tank.

7. Vapors Molecular Weight [lb/lb-mol]: The average molecular weight of the vapor phase of the VOCs 

mixture in the storage tank.

8. Paint Color: A drop-down list field to specify the exterior paint color of the storage tank: Aluminum 

or Specular / Aluminum or Diffuse / Grey or Light / Grey or Medium / Red or Primer / White.

9. Paint Condition: A drop-down list field to specify the exterior paint condition of the storage tank: 

Good / Poor / Average.

10. Tank Shell Height [ft]: The shell vertical height of the vertical cylindrical storage tank.

11. Tank Shell Diameter [ft]: The shell diameter of the cylindrical storage tank.

12. Tank Average Liquid Height [ft]: The average height of stored liquid during the survey period, 

measured from the bottom of the storage space to the top of the liquid.

13. Tank Roof Height [ft]: The height of the tank fixed roof measured from the top of the tank shell to the 

highest point of the roof.

14. Tank Roof Type: A drop-down list field to specify the tank roof type: Cone or Peaked / Dome / Flat.

15. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

16. Material Processed: A drop-down list field to specify the processed material: Distillate Oil (Diesel) /

Crude Oil / Condensate / Other.

The calculator STO-M04R Version 3 in OCS AQS calculates the monthly emissions with pollution 

control from an uninsulated vertical cylindrical storage tank using the following Control Request fields

in Figure A - 59:

Figure A - 59. STO-M04R Control Request tab

1. Primary Type of Control Equipment: A drop-down list field to specify the primary type of the used 

control equipment. If the type of is not listed, user can select Other and explain in the comments field.

2. Description of Control Equipment Chain: If more than one type of control technology is used, user 

can describe the sequence of processing in this field.

3. Reduction Efficiency [%]: This term describes the reduction of all emitted constituents of the 

emission stream using the control technology. For example, if a Vapor Unit Recovery is employed 

with a 90% reduction efficiency, the user enters “90” in the “Reduction Efficiency [%]” field. After 

the calculation is executed, all the emitted constituents will be reduced uniformly by 90%.
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4. Control Device? – Is end of pipe control technology used with this source? A drop-down [Yes/No] 

list.

5. Is a Factory Acceptance Test Certificate attached for primary control equipment? – A drop-down 

[Yes/No] list to specify if functionality certification paperwork is available for the control equipment.

IMPORTANT: Supporting equipment documentation may be required by BOEM/BSEE to verify 

specified control efficiency.
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A.37VEN-M01R (Cold Vent)

The calculator VEN-M01R Version 4 in OCS AQS calculates the monthly emissions from a cold vent 

using the following Data Request fields in Figure A - 60:

Figure A - 60. VEN-M01R Data Request tab

1. Volume of vented Gas [Mscf]: The total volume of gas vented during the survey period, including 

periods of upset venting, volume adjusted to standard temperature and pressure). The GOADS 

volume vented should match the Office of Natural Resources Revenue (ONRR)’s volume vented 

reported on the Oil and Gas Operations Report (OGOR).

2. Concentration of VOC in the Vented Gas [ppmv]: The concentration of volatile organic compounds

(VOC) in the vented gas.

3. Emissions Destination: A drop-down list field to specify the emissions destination – whether they are 

vented locally, flared locally, vented remotely, flared remotely, or routed to system. Vented locally 

selection will compute the emissions vented from this unit. Whereas, flared locally, vented remotely, 

flared remotely, and routed to system selections will zero out emissions from this unit.

4. Material Processed: A drop-down list field to specify the processed material: Gas/ Natural Gas / 

Process Gas / Exhaust gas.

5. Hours of Operation per Month [hr]: The total monthly hours of operation of the cold vent during the 

survey period.

6. Vent Type: A drop-down list field to specify the type of venting pressure: High Pressure / Low 

Pressure.
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Appendix B – Lease Operation Calculator Descriptions

B.1 DIE-M02R-LO (Diesel Engines Where Max HP < 600)

The calculator DIE-M02R-LO Version 2 in OCS AQS calculates the emissions from a diesel engine

where Max HP < 600 using the following Data Request fields in Figure B - 1:

Figure B - 1. DIE-M02R-LO Data Request tab

1. Total Fuel Usage [gallons]: Total rate of the diesel fuel used during the survey period.

2. Fuel Heating Value [Btu/lb]: The amount of heat released during the combustion of a specified 

amount of the diesel fuel. Default value is 19300 Btu/lb.

3. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil.

4. Hours of Operation per Period [hr]: The total hours of operation of the diesel engine during the survey 

period.

5. Operating Horsepower [hp]: The operating horsepower of the diesel engine.

6. Max Rated Horsepower [hp]: The manufacturer’s maximum rated horsepower of the diesel engine.

7. Max Rated Fuel Usage [Btu/hp-hr]: The maximum hourly usage rate of the diesel fuel.

8. Average Fuel Used [Btu/hp-hr]: The average hourly rate of diesel fuel used during the survey period. 

This field is auto-calculated.
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B.2 DIE-M03R-LO (Diesel Engines Where Max HP >= 600)

The calculator DIE-M03R-LO Version 2 in OCS AQS calculates the emissions from a diesel engine 

where Max HP >= 600 using the following Data Request fields in Figure B - 2:

Figure B - 2. DIE-M03R-LO Data Request tab

1. Total Fuel Usage [gallons]: Total rate of the diesel fuel used during the survey period.

2. Fuel Heating Value [Btu/lb]: The amount of heat released during the combustion of a specified 

amount of the diesel fuel. Default value is 19300 Btu/lb.

3. Fuel Sulfur Content [wt%]: The weight percentage concentration of the sulfur content in the used 

diesel fuel. For example, if the fuel is 1.0% sulfur, then user enters 1 and not 0.01.

4. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil.

5. Hours of Operation per Period [hr]: The total hours of operation of the diesel engine during the survey 

period.

6. Operating Horsepower [hp]: The operating horsepower of the diesel engine.

7. Max Rated Horsepower [hp]: The manufacturer’s maximum rated horsepower of the diesel engine.

8. Max Rated Fuel Usage [Btu/hp-hr]: The maximum hourly usage rate of the diesel fuel.

9. Average Fuel Used [Btu/hp-hr]: The average hourly rate of diesel fuel used during the survey period. 

This field is auto-calculated.
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B.3 DIE-M03R-DO (Crude Oil Production Well Drilling – Diesel Engine)

The calculator DIE-M03R-DO Version 2 in OCS AQS calculates the emissions from a diesel engine used 

for crude oil production well drilling using the following Data Request fields in Figure B - 3:

Figure B - 3. DIE-M03R-DO Data Request tab

1. Hours of Operation per Period [hr]: The total hours of operation of the well drilling rig during the 

survey period.

2. Total Vessel Power[kW]: The total operating vessel power (totaling individual propulsion engines).

3. Load Factor [%]: The total load factor percentage of the drilling rig's engine. Default value is 80 %.

4. Model Year: The engine’s manufacture year. 

5. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil. 

Default selection is Diesel.

6. Operating Horsepower [hp]: The operating horsepower of the drilling rig’s engine.

B.4 DIE-M03R-DG (Natural Gas Production Well Drilling – Diesel Engine)

The calculator DIE-M03R-DG Version 2 in OCS AQS calculates the emissions from a diesel engine used 

for natural gas production well drilling using the following Data Request fields in Figure B - 4:

Figure B - 4. DIE-M03R-DG Data Request tab
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1. Hours of Operation per Period [hr]: The total hours of operation of the well drilling rig during the 

survey period.

2. Total Vessel Power[kW]: The total operating vessel power (totaling individual propulsion engines).

3. Load Factor [%]: The total load factor percentage of the drilling rig's engine. Default value is 80 %.

4. Model Year: The engine’s manufacture year. 

5. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil. 

Default selection is Diesel.

6. Operating Horsepower [hp]: The operation horsepower of the drilling rig’s engine.
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B.5 C1C2-DRILL-LO (Self-Propelled C1/C2 Vessel – US Flagged)

The calculator C1C2-DRILL-LO Version 1 in OCS AQS calculates the emissions from a US flagged selfpropelled C1/C2 vessel using the following Data Request fields in Figure B - 5:

Figure B - 5. C1C2-DRILL-LO Data Request tab

1. Hours of Operation per Period [hr]: The total hours of operation of the self-propelled vessel during 

the survey period.

2. Total Vessel Power[kW]: The total operating vessel power (totaling individual propulsion engines).

3. Load Factor [%]: The total load factor percentage of the vessel’s engine. Default value is 80 %.

4. Model Year: The engine’s manufacture year. 

5. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil. 

Default selection is Diesel.
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B.6 C1C2-DRILL-LO-F (Self-Propelled C1/C2 Vessel – Foreign Flagged)

The calculator C1C2-DRILL-LO Version 1 in OCS AQS calculates the emissions from a foreign-flagged,

self-propelled C1/C2 vessel using the following Data Request fields in Figure B - 6:

Figure B - 6. C1C2-DRILL-LO-F Data Request tab

1. Hours of Operation per Period [hr]: The total hours of operation of the self-propelled vessel during 

the survey period.

2. Total Vessel Power[kW]: The total operating vessel power (totaling individual propulsion engines).

3. Load Factor [%]: The total load factor percentage of the vessel’s engine. Default value is 80 %.

4. Material Processed: A drop-down list field to specify the processed material: Diesel / Distillate Oil. 

Default selection is Diesel.
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Appendix C – Revision History

Table C-1. Revision history

Date Document 

Version

Software 

Version Changes

7/26/22 1.9 1.17 • Reformatted the manual into BOEM’s Environmental 

Studies Program format for publication

• Reorganized 1.2, 1.3, and 1.4 for better flow

• Updated 3.2.3 Importing Amine & Glycol Emissions

• Completed technical editing on the document

• Moved Revision History to Appendix C

• AT – Accepted reviewer changes

• AT – Corrected author names

• AT – Updated OCS AQS function map

• AT – Added the “Pathway” for each applicable section

• AT – De-capitalized regular instances of software terms

• AT – Added “LDAR” to the list of acronyms

• AT – Updated figure caption format in the appendices and 

created cross-references in the text

• AT – Added reference description in section 3.2.14

6/8/22 1.8 1.17 • Updated 2.2 Operator Submittals Dashboard

• Updated 3.2.7.5 Delete Release Point

• Removed 3.2.12 Importing Amine and Glycol Emissions 

(see 3.2.3)

• Added 3.2.15 and 3.4.4 Adding Supporting Documentation

• Added 3.5 Remove Unassigned Release Points

• Updated 4 Emissions: Lease Operations

• Added user-specified text to section 4.2.2: Lease Source vs 

Emission Process

• Updated 7.2 Gridded Emissions to include Equipment Type

• Removed 9.1.1.1 Create New Inventory 

• Added Appendix B – Lease Operation Calculator 

Descriptions

• Minor updates to reflect the current and most recent operator 

version of the application 

2/25/22 1.7 1.13 • Minor updates, typo fixes

1/27/22 1.6 1.13 • Appendix A – Updated descriptions and screenshots

• Appendix A – Updated control approach descriptions for 

select calculators

• Appendix A – Added Appendix A – List of Figures

1/14/22 1.5 1.12 • Appendix A – Calculator Descriptions has been updated to 

reflect the revisions done to the calculators

11/3/21 1.4 1.12 • Reviewed and expanded all sections as it pertains to the 

operator version of the application
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Date Document 

Version

Software 

Version Changes

• Submitting Inventories has been moved and expanded under 

2 (Dashboards)

• Updated most screenshots

9/14/21 1.3 1.10 • Added 3.2.3 Importing Amine & Glycol Emissions

• Removed Delete Release Point section

• Updated QA/QC functionality during data entry and saving

• Updated 3.2.13 Calculate Emissions

• Added 3.2.14 Global Warming Potential Details

• Updated 4.2.5 Add/Delete Lease Operation Processes

• Updated Calculator Appendix

• Removed GHG – Global Warming Potential section from 

GHG chapter

• Removed Facility Transfer from Tools chapter

• Updated Documents Section

• Updated Reports Section

• Updated Settings Section

• Updated Acronyms section

5/24/21 1.2 1.7 • Updated 3.2.4 Emission Units Add Sources

• Updated 3.2.11 Calculate Emissions

• Update 6.1.1 Documents Viewing

• Updated calculators in Appendix A with new Data Request 

Fields

3/23/21 1.1 1.6 • New Login page

• Updated Flare release point guidance

• Moved Release Point access in AEM

• Updated Calculator Report

• Expanded GWP description

• Revised Documents module

• Improved Map Overview feature

• Revised Lease Operation edits for processes

2/4/21 1.0 1.5 • New facility structure fields to describe platform parameters

• “From Facility Location” button in Georeference Panel

• Orphan Release Points Report

• QA/QC link in inventory submittal feature

To reflect these changes and also provide enhanced 

descriptions/clarifications for existing features, the following 

sections have been added or modified:

• 3.2.4.1 (Structure Details) – new 

• 3.2.6 (Decommissioned Facilities) – new 

• 3.2.7.4 (Create New Release Point) – updated

• 4.2.4 (Add Lease Operation Source) – updated 

• 7.1 (Using the Map Module) – updated 

• 7.2 (Gridded Emissions) – updated 
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Date Document 

Version

Software 

Version Changes

• 7.3 (Displayed Feature Information) – new 

• 8.2.10 (Other Reports) – updated 

• 9 (Submitting Inventories) – new 

• App A Calculator updates

12/30/20 0.2 1.4.26 Updated OCS AQS URL information (Section 1.2).

12/17/20 0.1 1.4.26 The following sections have been revised to reflect OCS AQS 

v. 1.4 release:

• Section 1.8 (removed reference to the Admin module)

• Section 2.1 (added a description for the new Operator 

Submittal dashboard)

• Section 2.2 (new section describing the updated inventory 

submission functionality)

• Section 5 (removed submittal description, now given in 

Section 2)

• Section 8 (additional and updated information on various 

report features)

• Appendix A – Calculator Descriptions (updated descriptions)

12/1/20 0 1.3 Original Version 
U.S. Department of the Interior (DOI)

DOI protects and manages the Nation's natural resources and cultural 

heritage; provides scientific and other information about those resources; 

and honors the Nation’s trust responsibilities or special commitments to 

American Indians, Alaska Natives, and affiliated island communities.

Bureau of Ocean Energy Management (BOEM)

BOEM’s mission is to manage development of U.S. Outer Continental Shelf 

energy and mineral resources in an environmentally and economically 

responsible way.

BOEM Environmental Studies Program

The mission of the Environmental Studies Program is to provide the 

information needed to predict, assess, and manage impacts from offshore 

energy and marine mineral exploration, development, and production 

activities on human, marine, and coastal environments. The proposal, 

selection, research, review, collaboration, production, and dissemination of 

each of BOEM’s Environmental Studies follows the DOI Code of Scientific 

and Scholarly Conduct, in support of a culture of scientific and professional 

integrity, as set out in the DOI Departmental Manual (305 DM 3).