Underground Natural Gas Storage Facility Annual Report

Instructions (rev 2020) for PHMSA Form 7100.4-1 (rev 2020)
UNDERGROUND NATURAL GAS STORAGE FACILITY
ANNUAL REPORT FOR CALENDAR YEAR 20__

GENERAL INSTRUCTIONS
All section references are to Title 49 of the Code of Federal Regulations (49 CFR). This Annual Report is
required per §191.17 and must be filed per §191.7. Read through the Annual Report and instructions
carefully before beginning the Report.
Each operator of an underground natural gas storage facility must submit an Annual Report for that system
on DOT Form PHMSA 7100.4-1. This report must be submitted each year, not later than March 15, and
provide information about wells, reservoirs, and geologic storage formations as-of December 31 of the
previous year. Surface piping should be reported on PHMSA Form F7100.2-1, Gas Transmission and
Gathering Annual Report. If an operator discovers an error in a submitted annual report, a supplemental
report should be filed. Changes made to the underground natural gas storage facility after the end of the
reporting year should not result in a supplemental report.
The term “underground natural gas storage facility” is defined in §192.3. Additional terms are defined in
American Petroleum Institute (API) Recommended Practice (RP) 1170, “Design and Operation of
Solution-mined Salt Caverns used for Natural Gas Storage” and API RP 1171, “Functional Integrity of
Natural Gas Storage in Depleted Hydrocarbon Reservoirs and Aquifer Reservoirs.”
If you need copies of the Form PHMSA F 7100.4-1 and/or these instructions, they can be found on
https://www.phmsa.dot.gov/forms/pipeline-forms. The documents are included in the section titled
Accident/Incident/Annual Reporting Forms.
ONLINE REPORTING REQUIREMENTS
Annual Reports must be submitted online through the PHMSA Portal at https://portal.phmsa.dot.gov/portal,
unless an alternate method is approved (see Alternate Reporting Methods below).
You will not be able to submit reports until you have met all of the Portal registration requirements – see
https://portal.phmsa.dot.gov/PHMSAPortal2/staticContentRedesign/howto/PortalAccountCreation.pdf
Completing these registration requirements could take several weeks. Plan ahead and register well in
advance of the report due date.
REPORTING METHOD
Use the following procedure for online reporting:
1. Go to the PHMSA Portal at https://portal.phmsa.dot.gov/portal
2. Enter PHMSA Portal Username and Password; press enter
3. Select OPID; press “continue” button.
4. Under “Create Reports” on the left side of the screen, under Annual select
“Underground Natural Gas Storage Facility” and proceed with entering your data. Only

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Instructions (rev 2020) for PHMSA Form 7100.4-1 (rev 2020)
UNDERGROUND NATURAL GAS STORAGE FACILITY
ANNUAL REPORT FOR CALENDAR YEAR 20__

one annual report for an OPID may be submitted per year.
5. To save intermediate work without formally submitting it to PHMSA, click Save. To
modify a draft of an annual report that you saved, go to Saved Reports and click on
Underground Natural Gas Storage Facility. Locate your saved report by the date or
report year. Select the record by clicking on it once, and then click Modify above the
record.
6. Once all sections of the form have been completed, click on Validate to ensure all
required fields have been completed and data meets all other requirements. A list of errors
will be generated that must be fixed prior to submitting an Annual Report.
7. Click Submit when you have completed the Report (for either an Initial Report or a
Supplemental Report), and are ready to initiate formal submission of your Report to
PHMSA.
8. A confirmation message will appear that confirms a record has been successfully
submitted. To save or print a copy of your submission, go to Submitted Reports on the
left hand side, and click on Underground Natural Gas Storage Facility Gas. Locate your
submitted report by the date or report year, and then click on the PDF icon to either open
the file and print it, or save an electronic copy.
9. To submit a Supplemental Report, go to Submitted Reports on the left hand side, and
click on Underground Natural Gas Storage Facility. Locate your submitted report by
the date or report year. Select the record by clicking on it once, and then click “Create
Supplemental”.
Alternate Reporting Methods
Operators for whom electronic reporting imposes an undue burden and hardship may submit a written
request for an alternative reporting method. Operators must follow the requirements in §191.7(d) to request
an alternative reporting method and must comply with any conditions imposed as part of PHMSA’s
approval of an alternate reporting method.
SPECIFIC INSTRUCTIONS
Make an entry in each block for which data is available. Estimate data only if necessary. Avoid entering
any data as UNKNOWN or 0 (zero) except where zero is appropriate to indicate that there were no
instances or amounts of the attribute being reported.
Enter the Calendar Year for which the Report is being filed, bearing in mind that the report should reflect
the system as-of the end of that calendar year.
The Initial Report or Supplemental Report box will be populated by the online system.

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Instructions (rev 2020) for PHMSA Form 7100.4-1 (rev 2020)
UNDERGROUND NATURAL GAS STORAGE FACILITY
ANNUAL REPORT FOR CALENDAR YEAR 20__

For a given OPID, a single Annual Report is permitted each year. Create a Part B for each facility
operated under your OPID. Create a Part C for each reservoir or geologic storage formation
within a facility.
PART A – OPERATOR INFORMATION
Part A is completed once for each Annual Report.
A1. Operator’s 5-digit Identification Number (OPID)
For online entries, the OPID will automatically populate based on the selection you made when entering
the Portal. If you have log-in credentials for multiple OPID, be sure the report is being created for the
appropriate OPID. Contact PHMSA’s Information Resources Manager at 202-366-8075 if you need
assistance with an OPID.
A2. Name of Operator
This is the company name associated with the OPID. For online entries, the name will be automatically
populated based on the OPID entered in A1. If the name that appears is not correct, you need to submit an
Operator Name Change (Type A) Notification.
A3. Address of Operator
This is the headquarters address associated with the OPID. For online entries, the address will
automatically populate based on the OPID entered in A1. If the address that appears is not correct, you
need to change it in the online Contacts module.
PART B – STORAGE FACILITY
Part B is completed once for each underground natural gas storage facility operated by your OPID.
B1. Facility Name
Enter the name used by your company to identify the facility to federal government or state government
agencies.
B2. INTERstate or INTRAstate
INTERstate means a facility subject to the jurisdiction of the Federal Energy Regulatory Commission
(FERC) under the Natural Gas Act (15 U.S.C. 717 et seq.).
INTRAstate means a facility not subject to the jurisdiction of FERC under the Natural Gas Act (15 U.S.C.
717 et seq.).
B3. Facility Location
Enter the latitude, longitude, State, and County for the storage facility. If you have already selected a
latitude and longitude within the facility for other reporting or communication purposes, report it in this
question. Otherwise, identify a latitude and longitude within the facility and report it in this question. If
the facility is in multiple Counties, enter the single County with the largest portion of the facility.
Report latitude and longitude as Decimal Degrees with a minimum of 5 decimal places (e.g. Lat:
38.89664 Long: -77.04327), using the WGS84 datum. All locations in the United States have a negative

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Instructions (rev 2020) for PHMSA Form 7100.4-1 (rev 2020)
UNDERGROUND NATURAL GAS STORAGE FACILITY
ANNUAL REPORT FOR CALENDAR YEAR 20__

longitude coordinate, which is added by the data collection software. Do not enter the negative sign
in the longitude field.
B4. Energy Information Administration (EIA) Gas Field Code
Enter the EIA gas field code for the facility. Navigate to https://www.eia.gov/naturalgas/data.php. Select
“Storage”, then select “U.S. field level storage data” to see the most current EIA codes .
Gas Volumes
B5. Working gas capacity
Enter the design working gas capacity in billion standard cubic feet (BCF) and include two decimal
places.
B6. Base (also known as Cushion or Pad) gas
Enter the base gas volume, including native gas, in billion standard cubic feet (BCF) and include two
decimal places.
B7. Total gas capacity
The data collection software will add B5 and B6 to calculate B7 in billion standard cubic feet (BCF).
B8. Metered volume of natural gas withdrawn from the facility for calendar year
Enter the metered volume of gas withdrawn from the facility during the calendar year in billion standard
cubic feet (BCF) and include two decimal places.
B9. Metered volume of natural gas injected into the facility for calendar year
Enter the metered volume of gas injected into the facility during the calendar year in billion standard
cubic feet (BCF) and include two decimal places.
PART C – RESERVOIRS AND WELLS
Part C is completed once for each reservoir or geologic storage formation within a facility reported in Part
B.
Facility Name is populated based on your entry in Part B.
C1. Reservoir/Salt Dome Name
Enter the name used by your company to identify the reservoir or geologic storage formation. For caverns,
enter the salt dome name.
C2. Year reservoir placed in storage service
Enter the year the reservoir or geologic storage formation was first used for storage of natural gas.
C3. Type
Select the type of reservoir or geologic storage formation for the facility. If other is selected, provide text
describing the type.

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Instructions (rev 2020) for PHMSA Form 7100.4-1 (rev 2020)
UNDERGROUND NATURAL GAS STORAGE FACILITY
ANNUAL REPORT FOR CALENDAR YEAR 20__

C4. Maximum Wellhead Surface Pressure
A single well at each reservoir or geologic storage facility is typically selected as a representative well for
measuring pressure. Enter the name of the representative well selected for the reservoir or geologic
storage formation in C4a. In C4b, enter the maximum surface pressure recorded for the applicable year at
the representative well in pounds per square inch gauge (psig).
Reservoir Depth
C5. Approximate Maximum Depth
Enter the approximate distance from ground level to the bottom of the reservoir or cavern(s) in feet.
C6. Approximate Minimum Depth
Enter the approximate distance from ground level to the top of the reservoir or cavern(s) in feet.
Wells
Enter the number of wells in C7 through C23 as-of the end of the calendar year.
C7. Number of Injection and/or Withdraw Wells by Year Range Placed in Storage Operation
Enter the number of well(s) using the year each well was placed into storage operation or the year the well
was re-completed with cemented tubing/casing for storage operation.
C8. Number of Monitoring and/or Observation Wells by Year Range Placed in Storage Operation
Enter the number of well(s) using the year each well was placed into storage operation or the year the well
was re-completed with cemented tubing/casing for storage operation. Include Monitoring and/or
Observation wells outside of the storage zone.
C9. Number of Wells drilled during the calendar year
C10. Wells plugged and abandoned during the calendar year
C10a. Number of wells re-plugged during the calendar year
C10b. Number of wells plugged but not abandoned during the calendar year. Do not report
temporary bridge plugs in C10b.
C10c. Number of wells plugged and abandoned during the calendar year
Well Safety Valves
C11. Number of Wells with automated surface safety valves
Triggered valves are to be considered automated.
C12. Number of Wells with automated subsurface safety valves

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Instructions (rev 2020) for PHMSA Form 7100.4-1 (rev 2020)
UNDERGROUND NATURAL GAS STORAGE FACILITY
ANNUAL REPORT FOR CALENDAR YEAR 20__

Well Gas Flow
C13. Number of Wells with gas flow only through production tubing.
“Production tubing” is often referred to as “tubing-on-packer.”
C14. Number of Wells with gas flow only through production casing
C15. Number of Wells with gas flow through both production tubing and production casing
“Production tubing” is often referred to as “tubing-on-packer.”
C16. Number of Wells with some “other type” of gas flow
If greater than zero, enter text explaining the “other type” of gas flow through the well.
Well Maintenance
C17. Number of Wells with new production tubing installed during the calendar year
“Production tubing” is often referred to as “tubing-on-packer.” Include wells where production tubing
was replaced during the calendar year.
C18. Number of Wells with new production casing, new liner, or repairs to casing or liner during
the calendar year
C19. Number of Wells with wellhead remediation or repair during the calendar year
C20. Number of Wells with casing, wellhead, or tubing leaks during the calendar year
Include leaks reported as incidents on form PHMSA F7100.2, “Incident Report – Natural and Other Gas
Transmission and Gathering Pipeline Systems.” A non-hazardous release that does not meet the incident
definition and can be eliminated by lubrication, adjustment, or tightening is not a leak.
In C21 through C23, report the number of wells tested, regardless of the test results.
C21. Number of Wells with Pressure Test during the calendar year
C22. Number of Wells with Casing Evaluation for Corrosion/metal loss during the calendar year
C23. Number of Wells inspected using a downhole assessment method other than “Pressure Test”
and “Casing Evaluation for Corrosion/metal loss” during the calendar year
If greater than zero, enter text describing the other assessment method(s). Sonar testing, nuclear logs, and
noise/temperature logs are examples of other downhole assessment methods.
PART D – CONTACT INFORMATION
In D1 through D4, enter information about the person submitting the report.

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Instructions (rev 2020) for PHMSA Form 7100.4-1 (rev 2020)
UNDERGROUND NATURAL GAS STORAGE FACILITY
ANNUAL REPORT FOR CALENDAR YEAR 20__

In D5 through D8, enter information about the person designated to answer technical questions about this
report.

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