DAQ-2024-011552

Apil 17,2023
Director
Division of Air Quality
Utah Dept. of Environmental Quality
195 North 1950 West
Salt Lake City, UT 84116
Certified Mail: 7019 I 120 0000 0070 7852
RE: Breakdown lncident Report - Refinery power outage on April g,2o2g
Director:
In accordancewithUAC R307-107-l(2) andR307-|O7-2,HF SinclairWoods CrossRefining LLC,IIFSWCR,
is providing a breakdown incident report to the refinery power outage on April 3,2023 at B:24 am. your office
was initially notified on April 4,2023 at 9:47 am of an event that resulted in the release in excess of 0.31 tonsof SOz (AO DAQE-AN I 0 I 230 053 -22, Condition tr.B.5.a).
The Soz emissions in excess of our permitted limit of 0.31 tpd, DAQE-AN lol23oo53-23 Condition II.B.5.a,
caused by this power outage will be included in the reports required by R307-170. However, we are including
those excess emissions in this breakdown incident report.
Per Rocky Mountain Power's preliminary information, heavy snow dislodged from lines at the parrish
substation. The bouncing lines potentially contacted or caused damage along G [nes, resulting in a fault that
cascaded through the substation's re-closers. The extemal power bump resulted in a sudden lo-ss of power tothe FIFSWCR substations (inside the refinery's property boundary) which, in turn, resulted in multiple units
shutting down or entering states of upset.
HFSWCR followed power failure procedures to safely secure the process units affected, and began the processof starting up the downed process units.
Corrective measures directed at preventing future such incidents are still being investigated by Rocky
Mountain Power.
Date/Time SOz Total Emissions *SOz Permitted Emissions SOz Excess Emissions
41312023 8:24
AM_
4/412023 4:56
AM
0.63 tons 0.31 (rPD)0.32 tons
*AO DAQE-AN I 0 I 23005 3 -22 Condiaon tr.B.5.a
UTAH DEPARTIIENT OF
ENVIRONMENTAL QUAUTY
,tttF$nchr
HF SinclairWoods Cross Refining LLC
1070 W. 500 S, West Bountiful, UT 84087
801-299-6600 | HFSinclair.com DIVISION OF AIR QUALITY
REVIEWED Initials:Date: Nov 14, 2024Compliance status:OKFile #: 10123 (B2) Comment: FFY 2023
Relevant evidence as outlined in R307-107-2'
R307-107-2(1)(a)Equipment malfunction beyond
the reasonable control ofthe
owner or operator.
The event is ffiequent and
unexpected. The event was
beyond reasonable control based
on current operating
confizuration.
R307-107-2(1Xb)Excess emissions could not have
been avoided by better operation,
maintenance or improved design.
The refinery process units were
operating within designed
parameters prior to the power
outage.
R307-107-2(lXc)Air pollution control equipment
was maintained and operated in a
manner consistent with good
practice for minimizing
emissions.
All air pollution control
equipment was operating as
designed prior to the extemal
power outage.
R307-107-2(lXd)All necessary repairs were made
as quickly as practicable, using
off-shift labor and overtime as
needed.
Additional operators,
maintenance personnel, and
contractors were called out to
assist with startup.
R307-107-2(lXe)All practicable steps were taken
to minimize the potential impact
of the excess emissions.
All process units affected by the
external power outage were
brought back online as safely and
quickly as possible to minimize
emissions.
R307-107-2(1X0 Excess emission are not part of a
recurring pattem that make have
been caused by inadequate
operation or maintenance, or
inadequate design of the
malfunctioning component.
This is a non-recurring pattern.
If you have any questions or need additional information, please contact me at [phone] or email
ft ravis. smith@hfsinclair. com.
Sincerely,
Environmental Specialist
c: E. Benson (r) File 2.2.4.1
J. Barton