Intermountain Gas 260330-260401 IPUC Form 1 - Boise Field Audit

IPUC Pipeline Safety Inspection
Inspector(s): Galli, Perkins, Green, Brooks Date(s): 260330-260402, 260406
Company/Owner: Intermountain Gas Company Unit/OPID: 08160
Standard: ® Training: ❑ TIMP/DIMP: ❑ OQ: ❑
Incident: ❑ Damage Prevention: ❑ Drug & Alcohol: ❑ Inspection Days: 14.5
Inspection Summary
Audit consisted of IPUC inspectors Galli, Perkins, Brooks, Green inspecting field installed equipment for
the Boise, Idaho inspection units. The PHMSA IA question set and IGC equipment listing were used as a
guide throughout the audit to ensure all areas were completed.
March 30, March 31,April 1, 2026:
(2.5 Standard MG) (2.5 Standard BP) (2.5 Standard AG) (1.0 Standard JB)
Met with IGC company representatives in the Boise district office for in brief and to begin field audit and
review OQ records for all personnel taking part in the inspection.
Regulator Stations: 34 regulator stations were inspected for proper operation, regulator lock-up, relief
device operation, cathodic protection pipe-to-soil readings, pipe-to soil interface wrap protection, station
warning signs and right-of-way clearances.
1 casing-to-carrier isolation checks, no cathodic protection rectifiers, 10 pipeline patrols, 34
emergency/isolation valves and 24 HPSSs were checked for proper operation, observations listed below.
An exit interview was performed following the district inspection with field personnel of Intermountain
Gas Company and MDU Compliance Manager Colby Lundstrom.
Discrepancies:
Regulator Station 48413-RS-59923, the primary regulator failed to achieve lock-up due to significant oil
accumulation on the regulator diaphragm.
Regulator station 48413-RS-60048, the secondary regulator failed to achieve lock-up due to metal
shavings/debris found on the regulator seat.
HPSS's with no line markers (carsonite or sticker) 48375-HPSS-68981, 48375-HPSS-62243,
48375-HPSS-62332.
Valves: 48413-VLV-29800 was found iced up.
Cathodic Protection: A potential reading of—0.62 mV was identified at regulator station 48413-RS-59940,
which is below the minimum—0.85 mV criterion commonly used to demonstrate adequate CP. IGC
personnel subsequently identified that the test leads inside the Maloney post had been left disconnected,
resulting in an inaccurate and inadequate CP reading.
IPUC Form 1 Rev. 12/08/2025

IPUC Pipeline Safety Inspection
April 1, 2026: (0.5 Standard MG) (0.5 Standard BP) (0.5 Standard AG)
Completed and attached audit forms: PHMSA IA question set with OQ protocol 9, IPUC Form 1, Post-
Inspection Preliminary Written Findings and attached inspection documents.
April 2 & 6, 2026: (1.0 Standard Compliance MG) (1.0 Standard Compliance AG)
Inspectors Galli and Green wrote NOPV I202603.
April 13, 2026: (0.5 Standard Compliance MG) (0.5 Standard Compliance JB)
Inspectors Galli and Brooks made adjustments to NOPV I202603.
April 14, 2026: (0.5 Standard Compliance MG) (0.5 Standard Compliance JB) (0.5 Standard
Compliance BP)
Inspectors Galli and Brooks made adjustments to NOPV I202603.
Corrective Action Required: ® Yes ❑ No Compliance Letter#: NOPV I202603
Lead Inspector: Galli Date: Reviewer: Brooks Date:
260414
Signature: Signature:
IPUC Form 1 Rev. 12/08/2025