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'lal Response & Remediallon
November 10,2025
Mr. Brent Everett
Utah Department of Environmental Quality
Div. of Environmental Response & Remediation, SERC
PO Box 144840,195 North 1950 West
salt Lake city, uT 84116
Certified Mail:9589 0710 5270 2858 6261 87
Ms. Ember Herrick
Davis County Sheriffs Departnent
Davis County LEPC
800 West State St.
Farmin$on, Lff 84025
Certified Mail:9589 0710 5270 2858 6250 12
RE: Written Follow-up Emergency Notification - Sulfuric Acid Release on October 28,2025
To Whom It May Concern:
ln accordance with 40 CFR 355.40OX1-3),If SinclairWoods Cross Refining LLC is providing a written
follow-up to the emergsncy notification of the release that occurred on October 28,2025. Your offrce was
notified on October 28,2025, of an event that resulted in a release in excess of 1,000 lbs of Sulfuric Acid
within a 24-hovr period. The release was a result of a connection fitting failure. Approximately 135 gallons
were captured in the tote's secondary containment while approximately 15 gallons were released to a cement
surface.
The estimated quantrty of sulfuric acid was 2,182 lbs.
If you have any questions or need additional information, please contact me at [phone] or email
ft ravis. [e-mail].
HF Sinclair Woods Cross Refining LLC
1070 W. 500 S, West Bountiful, UT 84087
801 -299-6600 | HFSinclair.com
40 cFR 3ss.40(bx1)Actions taken to respond and
contain the release.
The acid released to the cement
was neutralized and cleaned up.
The material in the secondary
containment was recovered, and
the failed fitting was replaced.
40 cFR 355.40(bX2)Any known or anticipated acute
or chronic health risks associated
with the release.
None.
40 cFR 355.40(bX3)Where appropriate, advice
regarding medical attention
necessary for exposed
individuals.
None.
,rd
Sincerely,
F. Travis Smith
Environmental Specialist
c E. Benson (r) File 2.2.4.1
J. Barton
2