Intermountain Gas 250624 Rexburg LNG Compliance Follow-up

IPUC Pipeline Safety Inspection
Inspector(s): Perkins Date(s): 250624
Company/Owner: Intermountain Gas Company Unit/OPID: 08160
Standard: ® Training: ❑ TIMP/DIMP: ❑ OQ: ❑
Incident: ❑ Damage Prevention: ❑ Drug& Alcohol: ❑ Inspection Days: 0.5
Inspection summary
June 24, 2025: (0.5 Standard)
Inspector Perkins traveled to the Rexburg LNG Plant to conduct a follow-up investigation of prior
compliance concerns and violations: Questions in parenthesis below coincide with the recommendations
from the CHI inspection.
1. (1) Consider adding stairs or similar up the embankment towards ESD buttons.
-New ESD was installed closer to tank in case of emergency.
2. (4) Verify if on-board generator will shutdown when ESD is activated.
-ESD Control switch on vaporization trailer was in the field vs plant position, once it was switched to plant
position all ESD's will now shutdown plant and generator, IGC is installing a placard by the switch to tell
personnel to leave in plant position.
3. (5) ESD station 817 between truck unloading area and control room, has been damaged, including a
broken grounding cable.
-New ESD switch, pole on which it is mounted has been replaced and grounding wire has been reattached.
4. (7) Control room has fuel gas for building heat but no gas detection.
-Gas detection sensor and alarm has been installed.
5. (8) Shop area of the control building is unfinished (wood construction with exposed insulation).
-All walls have been covered with sheet rock.
6. (9) Propane cylinder and gasoline can are stored on the mezzanine floor with could facilitate a fire.
-All combustibles are now stored in a flammable locker on the shop concrete floor.
7. (10) Consider adding second gas detector closer to building heater to detect leak of fuel gas.
-Gas detection sensor and alarm has been installed.
8. (12) Only CO2 fire extinguishers are available in the shop area, which may not be effective for a Class A
fire.
-There are now 3 Class ABC extinguishers in the building.
IPUC Form 1 Rev. 12/11/2024

IPUC Pipeline Safety Inspection
9. (15) Consider review of site security. Perimeter fence has significant gaps underneath in some locations
and no security beyond fence (no motion detection, no security cameras).
-Interior fence line has had gravel added and exterior fence line has had larger rock added to eliminate
gaps under fence.
10. (18) Install no smoking sign specifically at unloading station.
-New sign has been installed.
11. (19) Current extinguishers are not high flow.
-Wheel mounted fire extinguishers are high flow.
12. Conducted an inspection on all concrete/structural issues previously identified.
Structural condition assessment for the concrete cracking at the piers for the LNG tank and the
containment structure walls as identified by IPUC during 18 October 2023 field audit and Forsgren
Associates Inc. inspection report on 28 June 2024. (PHMSA Enforcement Item)
-IGC contracted ESI to make the needed repairs to all concrete structural issues. Currently the contractor
has started sealing the cracks on tank supports and piping supports. All cracks in piping containment and
main spill containment are being sealed or repoured. Once repairs are completed the contractor will coat all
concrete with a layer of water repellent/sealer. Will conduct follow-up inspection in the future when all
concrete work is completed.
13. (6,14) items have not been completed and will reinspect in the future.
June 24, 2025: Inspector Perkins completed all forms and loaded pictures.
Corrective Action Required: ® Yes ❑ No Compliance Letter#: I202418
Follow Up Required: ® Yes ❑ No By Date: 27-29 October 2025
Lead Inspector: Perkins Date: Reviewer: Brooks Date:
250227
Signature: ^ Signature: ,_S07 0'2
IPUC Form 1 Rev. 12/11/2024