DAQ-2025-000432

Chevronv
Troy Tortorich
Refinery Manager
Salt Lake Refinery
Chevron Products Company
685 S Chevron Way
North Salt Lake, UT 84054
Tel [phone]
Fax [phone]
January 3,2024
CERTIFIED MAIL
RETURN RECEIPT NO. 7021 2720 00014083 6852
Mr. Bryce Bird, Division Director
Utah Air Quality Division
P.O. Box 144820
195 North 1950 West
Salt Lake Ciry, UT 84114-4820
UTAH DEPABTMEN'T OF
ENVIRONMENTAL QUALITY
lIiu/.,,1
DIVISION OF AIR OUALIT\'
PM2.5 State Implementation Plan Deviations
Flare 3 Calendar Day Flow Limit Exceedance on January 3,2023
Sulfur Recovery Unit 2 Sulfur Dioxide Daily Emission Limit Exceedance on
Flare 3 Calendar Day FIow Limit Exceedance on November 19,2023
Sulfur Recovery Unit I Sulfur Dioxide Daily Emission Limit Exceedance on
Dear Director:
August 2,2023
November 21,2023
In accordance with the Utah State Implementation Plan, Section IX.H.l.c.iii, Chervon - Salt Lake
Refinery must submit deviation report no later than24 months following the incident.
On January 1,2023, Flare 3 exceeded the calendar day flow limit of 500,000 cubic feet. This deviation
occurred due to the electricity supply being temporarily interrupted, which caused several units to shut
down. Refinery personnel immediately responded and began to start-up the units that had shut down. Per
the Chevron NSR Consent Decree excess emissions were reported to the Environmental Protection
Agency on February 6,2023.
On August 2,2023, Sulfur Recovery Unit (SRU) 2 exceeded the daily sulfur dioxide (SO2) emission limit
of 0.268 ton per day. This deviation occurred due to the valve on the flash drum not closing properly,
which allowed excess natural gas to burn in the unit. The natural gas consumed more oxygen than
typically expected. Due to the lack of oxygen, the unit was unable to burn off the remaining acid gas. As
a result, acid gas was emitted causing the refinery to exceed the daily emission limit.
On November 19,2023, Flare 3 exceeded the calendar day flow limit of 500,000 cubic feet. This deviation
occurred when a relief valve on a feed dryer was lifted in the Isomerization Unit. However, the valve
failed to reset and didn't seal properly. Facility personnel couldn't locate the issue before the flow limit
was exceeded. Upon discovery the vessel was isolated, and the valve was properly closed.
REVIEWED Initials: Date: Jan 16, 2024Compliance Status: OK File #: 10119 (B2)
Chcvronv
Troy Tortorich
Refinery Manager
Salt Lake Refinery
Chevron Products Company
685 S Chevron Way
North Salt Lake, UT 84054
Tel [phone]OO
Fax [phone]
JAN 5 2,;?4
DIVISION OF AIR QUALITY
Sincerely, ,/4ffiTroy Tortorich
On November 21, 2023, SRU I exceeded the daily SO2 emission limit of 0.424 tons per day. This
deviation occurred after the unit tripped due to the flame going out in the incinerator. Once the burner
was relit, operations attempted to start up the unit. However, during that time excess oxygen w.N
unintentionally being added into the system from a valve that is normally closed and the trim air analyzer
failed to transmit operating conditions. The extra oxygen caused the iron sulfide in the reactor beds to
combust and emit SO2 emissions over the daily limit. Per the Chevron NSR Consent Decree excess
emissions were reported to the Environmental Protection Agency on January 3,2024.
If you have any questions, please contact Lauren Vander Werff at [phone] or
LVanderWerff@ chevron. com.
UTAH DEPARTMENT OF
ENVIRONMENTAL QUAUTY