Avista 260421 Lewiston Safety Inspection

IPUC Pipeline Safety Inspection
Inspector(s): Galli Date(s): 260420-260423
Company/Owner: Avista Utilities Unit/OPID: 31232
Standard: ® Training: ❑ TIMP/DIMP: ❑ OQ: ❑
Incident: ❑ Damage Prevention: ❑ Drug & Alcohol: ❑ Inspection Days: 4.0
Inspection Summary
April 20, 2026: (1.0 Standard) (Galli 1.0)
IPUC inspector Galli traveled to Lewiston, Idaho to inspect field installed operating equipment in the
Avista Lewiston inspection unit.
April 21-22, 2026: (2.0 Standard) (Galli 2.0)
Met with Avista company representatives in the Clarkston, Washington district office for a briefing,
reviewed welding records, past year work orders, verified calibrations of inspection equipment and began
the field audit.
Nine regulator stations were inspected for relief operation, regulator lock-up, general condition of the
station including pipe-to-soil wrap, and cathodic protection. Seven rectifiers, five carrier-to-casings,
sixteen control valves and one high-pressure service set was also inspected.
IPUC inspector Galli traveled back to Boise, Idaho.
April 23, 2026: (0.5 Standard) (0.5 Compliance) (Galli 1.0)
Wrote inspection report, completed audit forms: PHMSA IA question set with OQ protocol 9,
IPUC Form 1, Post-Inspection Preliminary Written Findings, attached inspection documents and wrote
NOPV A202601.
Discrepancies:
Regulator 414 had dithiazine accumulation and a hair on the worker regulator diaphragm, which interfered
with proper lockup. The monitor regulator also failed to achieve lockup. Technicians corrected both issues
by disassembling the units, cleaning the diaphragms, and replacing the pilot stems. The worker regulator
experienced similar failures in 2021 and 2022.
Corrective Action Required: ® Yes ❑ No Compliance Letter#: A202601
Lead Inspector: Galli Date: Reviewer: Brooks Date:
260423
Signature: i_./� Signature: b b51�
IPUC Form 1 Rev. 12/08/2025