DAQ-2024-005109

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TO: Executive Secretary, Utah Air Quality Board
FROM: Nucor Steel
RE: Deviation Report for Permit # 300002004
DATE: Februarv 19.2024
In accordance with Operating Permit provision I.S.2.b, and UtahAdministrative Code (UAC)
R3 07-4 I 5-6a(3)(c)(ii), the following deviation report is submitted:
l.Listthedatesthatthedeviationoccurred:Start:2l6l2024EndzW4,
2. Permit condition for which deviation occurred:
Condition II.B.3.i
The emissions limit for SOz is 93.98 lbs/hr based on a 3-hour rolling average. The limit was
exceeded for I hour at 98.8 lbs/hr.
3. Describe the deviation that occurred:
Additions to the furnace contained unexpected levels of sulfur that caused a spike in SOz
emissions (see attached graph.) The spike caused by the sulfur happened quickly leaving
the operators with little time to react to the pollutant. The steel that was in the furnace at
the time was scrapped due to the high sulfur levels causing inadequate chemistry.
Automatic controls discontinued operations following the high SOz spike, preventing
further exceedance.
4. Was the deviation due to an'oupset condition" as defined in Section II of the permit?
IYes tr No X "upset condition" not defined in Section II.
5. Describe the probable cause of deviation:
The probable cause was traced back to scrap from two railcars that came from Western
Metals. Western Metals is a scrap steel processing company and a subsidiary of Nucor.
6. Describe any corrective actions or preventive measures taken:
An investigation of raw materials that were used in the two EAFs during the time of the
occurrence of higher SOz emissions was completed. It was immediately determined that
the contaminate would be associated with scrap steel used at the time and was contained in
two railcars. The origination of the scrap was identified and found to have been processed
at a Western Metals company (a Nucor owned facility). Through discussions with
scrapyard personnel, the origination of the scrap steel was identified to be from Vernal,
Utah. Going forward, Western Metals will not be accepting scrap steel with sulfur
contamination from this upstream scrap supplier.
REVIEWEDInitials: RL Date: 3/5/2024Status: Received - Deviation noted in CEM Quarterly ReportFile ID#: 10008-B1
In accordance with Operating Permit provision I.K and UAC R307-415-5d, and based on
information and belief formed after reasonable inquiry I certify that the statements and
ion in this document aSq true, accurate, and complete.
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DIVISION OF AIR QUALITY