DAQ-2025-000494

1
DAQC-051-25
Site ID 10008 (B5)
MEMORANDUM

TO: FILE – NUCOR STEEL

THROUGH: Harold Burge, Major Source Compliance Section Manager

FROM: Rob Leishman, Environmental Scientist

DATE: January 16, 2025

SUBJECT: Nucor Bar Mill Group – Plymouth Division, NSPS, Title V, Box Elder County, FRS #
UT00000049000300002

INSPECTION TYPE: State Electronic Data Report (SEDR) Review

REVIEW DATE: January 16, 2025

SOURCE LOCATION: Plymouth/Box Elder County

SOURCE CONTACT: Kyndal Bair 435-458-2496

APPLICABLE
REGULATIONS: Title V Operating Permit
PERMIT NUMBER: 300002004
DATE OF PERMIT: May 23, 2022
Date of Last Revision: September 12, 2024

SOURCE REVIEW EVALUATION:

SOURCE INSPECTION
EVALUATION: With the exception of sources that only monitor for opacity, quarterly
report memoranda will only address the findings of the quarterly
report. Approval Order and Title V permit conditions addressing
continuous emission monitoring requirements will be addressed in
Nucor Steel’s relative accuracy performance specification test review
memorandum.

SEDR Review:

Fourth Quarter 2024
% Monitor Availability (MA) Performance Test Dates
(N/A to Opacity)
Summary of Excess Emissions During Point
Source Operation
Point
Source
Op.
hrs. Channel MA CGA Lin RATA Point
Source Channel Hrs. Limitation
Baghouse
Stack 1923 CO 100% 11/21/24 09/06/24 Baghouse
Stack CO 0.00 1200 lbs/hr - 1 hr
average
Baghouse
Stack 1923 NOx 100% 11/21/24 09/06/24 Baghouse
Stack CO 0.00 682.93 lb/hr - 8
hr average

1 8 2

2
Fourth Quarter 2024
% Monitor Availability (MA) Performance Test Dates
(N/A to Opacity)
Summary of Excess Emissions During Point
Source Operation
Point
Source
Op.
hrs. Channel MA CGA Lin RATA Point
Source Channel Hrs. Limitation
Baghouse
Stack 1923 SO2 100% 11/21/24 09/06/24 Baghouse
Stack CO 0.00
2800 tons/yr -
rolling 12-month
total
Baghouse
Stack NOx 0.00
245 tons/yr -
rolling 12-month
total
Baghouse
Stack NOx 0.00
59.5 lb/hr -
calendar-day
average (State
Only)
Baghouse
Stack SO2 0.00 93.98 lb/hr - 3 hr
rolling average
Baghouse
Stack SO2 0.00 89 lb/hr - 24 hr
average
Baghouse
Stack SO2 0.00
245 tons/yr -
rolling 12-month
total

Excess Emission Report - Hourly Summary
Point
Source Channel
Startup
&
Shutdown
Control
Equipment
Problems
Process
Problems
Other
Known
Causes
Unknown
Causes
Emission
Limit
Baghouse
Stack CO 0 0 0 0 0 1200 lbs/hr - 1 hr average
Baghouse
Stack CO 0 0 0 0 0 682.93 lb/hr - 8 hr average
Baghouse
Stack CO 0 0 0 0 0 2800 tons/yr - rolling 12-month
total
Baghouse
Stack NOx 0 0 0 0 0 245 tons/yr - rolling 12-month
total
Baghouse
Stack NOx 0 0 0 0 0 59.5 lb/hr - calendar-day
average (State Only)
Baghouse
Stack SO2 0 0 0 0 0 93.98 lb/hr - 3 hr rolling
average
Baghouse
Stack SO2 0 0 0 0 0 89 lb/hr - 24 hr average
Baghouse
Stack SO2 0 0 0 0 0 245 tons/yr - rolling 12-month
total

CMS Performance Summary - Hourly Summary
Point
Source Channel Monitor
Malfunction
Non-monitor
Malfunction
QA
Calibrations
Other
Known
Causes
Unknown
Causes
Baghouse Stack CO 0 0 0 0 0
Baghouse Stack NOx 0 0 1 0 0
Baghouse Stack SO2 0 0 0 0 0

3
Pollutant Concentration
Exceeded Span of CEM
Monitor Outage During
Point Source Operation
Alternate
Sampling CEM Modifications
0 Hours 0 Hours 0 Hours 0 Events

SOURCE INSPECTION
SUMMARY EVALUATION: Nucor Steel maintains its CEMS as required in R307-170 and 40 CFR
60.13.

CURRENT
RECOMMENDATIONS: All deviations appear to be a result of breakdown or process related
problems that do not warrant issuing a violation. Nucor Steel was in
compliance during this reporting period. No further enforcement
actions should be taken. Nucor Steel’s NSPS monitoring system
meets the performance standards of 40 CFR 60, Appendix B,
Performance Specifications. Duplicate monitoring systems and offset
calibration times have resulted in monitor unavailability at or near
zero hours.

HPV: No

RECOMMENDATION
FOR NEXT INSPECTION: Check DAS for daily zero and span drift.
Check the QC program to ensure that monitor drift is being tracked
and that the source can identify excessive drift.

ATTACHMENTS: Spreadsheet Review.
Nucor EER 4Q2024
Point Source Information Late Expired Cal. Gas Valid Cal. Gas Days Yes No
1 Type Code 100
(Company Information)Type Code Company Manager Company Name AIRS # Phone Number
Environmental
Contact1 100 Adam Zewe 00300002 435-458-2415 Doug Jones
1 100 0 0 0 0
1 Type Code 110(Point Source Identification)Type Code Point Source
Quarter1 - 4 Year Point Source
Operating Hrs. in
Quarter
1 110 4 2024 1923
1 110 0 0 0
1 110 0 0 0
1 Type Code 200(Monitor Identification)Type Code Point Source Channel Manufacturer Model No. Monitor SN Low Span High Span Installation Date
Monitor
Location
1 200 CO Ecochem MC3 512 0 1000 3/20/2013 STACK
1 200 NOx Ecochem MC3 512 0 250 3/20/2013 STACK
1 200 SO2 Ecochem MC3 512 0 50 3/20/2013 STACK
1 200 CO Thermo Scientific 48iQ-CAN 1181830035 0 1000 12/14/2018 STACK
1 200 NOx Thermo Scientific 42iQLS-ACBNA 1181830033 0 250 12/14/2018 STACK
1 200 SO2 Thermo Scientific 43iQ-CAN 1181830034 0 50 12/14/2018 STACK
1 200 0 0 0 0 0 0 1/0/1900 0
1 200 0 0 0 0 0 0 1/0/1900 0
1 Type Code310(Excess Emissions)SUMMARY REPORT Type Code Channel
Total Hours of Excess
Emissions
Excess Emissions - % of Total Operating Hours
RC 701 Hours - start up/Shutdown
RC 702 Hours-Control Equipment Problems
RC 703 Hours -
Process Problems
RC 704, 706, 707 Hours -Other Known Causes
RC 705 Hours -Unknown Causes
Emission
Limitation
Emission Limitation Units
Emission
Limitation
Averaging
Period
1 TRUE 310 CO 0 0.00% 0 0 0 0 0 1200 lbs/hr 1 hr average
1 TRUE 310 CO 0 0.00% 0 0 0 0 0 682.93 lb/hr 8 hr average
1 TRUE 310 CO 0 0.00% 0 0 0 0 0 2800 tons/yr rolling 12 month total
1 TRUE 310 NOx 0 0.00% 0 0 0 0 0 245 tons/yr rolling 12 month total
1 TRUE 310 NOx 0 0.00% 0 0 0 0 0 59.5 lb/hr calendar-day average (State Only)
1 TRUE 310 SO2 0 0.00% 0 0 0 0 0 93.98 lb/hr 3 hr rolling average
1 TRUE 310 SO2 0 0.00% 0 0 0 0 0 89 lb/hr 24 hr average
1 TRUE 310 SO2 0 0.00% 0 0 0 0 0 245 tons/yr rolling 12 month total
1 310 0 0 0 0 0 0 0 0 0
1 310 0 0 0 0 0 0 0 0 0
1 Type Code 300 (CMSPerformance Summary) Type Code Channel
Point Source Operating Hours
Downtime - % of
Total Operating
Hours
Total CMS Downtime
RC 721 Hours -
Monitor
Malfunction
RC 722 Hours -
Non-monitor
Malfunction
RC 723 Hours - QA Calibrations
RC 724 Hours -
Other Known
Causes
RC 725 Hours - Unknown Causes1 TRUE 300 CO 1923 0.00% 0 0 0 0 0 0
1 TRUE 300 NOx 1923 0.05% 1 0 0 1 0 0
1 TRUE 300 SO2 1923 0.00% 0 0 0 0 0 0
1 300 0 0 0 0 0 0
1 300 0 0 0 0 0 0
1 Type Code 250
(Performance Specification
RATA Results)
Type Code Channel
Date of Most Current RATA Date of Preceding RATA Months Between RATA's Units of Measurement CEM Value Reference Method Value Relative accuracy Pass/ Fail
1 396 Days 250 CO 09/06/24 08/07/23 13 lbs/hr 208.5 211.3 77.00% Pass
1 396 Days 250 NOx 09/06/24 08/07/23 13 lbs/hr 40.9 40.1 754.00% Pass
1 396 Days 250 SO2 09/06/24 08/07/23 13 lbs/hr 43.9 43.8 724.00% Pass
1 396 Days 250 CO 09/06/24 08/07/23 13 lbs/hr 231.1 211.3 208.00% Pass
1 396 Days 250 NOx 09/06/24 08/07/23 13 lbs/hr 35.8 35.2 540.00% Pass
1 396 Days 250 SO2 09/06/24 08/07/23 13 lbs/hr 44.3 44.3 795.00% Pass
1 0 Days 250 0 01/00/00 01/00/00 0 0 0 0 0.00% 0
1 0 Days 250 0 01/00/00 01/00/00 0 0 0 0 0.00% 0
1 Type Code 260
(CGA Results)Type Code Channel Date Audit Point No. Cylinder ID Cylinder Expiration Date Type of Certification Units ofMeasurement CEM Value Cylinder Value Precision%Pass/ Fail Range - High or Low1 Valid Cal. Gas 260 CO 11/14/24 1 EB0142277 02/08/27 P1 ppm 243.9 249 510.00% pass low
1 Valid Cal. Gas 260 CO 11/14/24 2 EB0085547 05/17/26 P1 ppm 545.3 544.3 100.00% pass high
1 Valid Cal. Gas 260 NOx 11/14/24 1 EB0142277 02/08/27 P1 ppm 64.433 63.82 63.30% pass low
1 Valid Cal. Gas 260 NOx 11/14/24 2 EB0085547 05/17/26 P1 ppm 140.567 136.5 406.70% pass high
1 Valid Cal. Gas 260 SO2 11/14/24 1 EB0142277 02/08/27 P1 ppm 13.333 12.71 63.30% pass low
1 Valid Cal. Gas 260 SO2 11/14/24 2 EB0085547 05/17/26 P1 ppm 26.8 27.8 100.00% pass high
1 Valid Cal. Gas 260 CO 11/21/24 1 EB0142277 02/08/27 P1 ppm 258.733 249 973.30% pass low
1 Valid Cal. Gas 260 CO 11/21/24 2 EB0085547 05/17/26 P1 ppm 565.133 544.3 2083.30% pass high
1 Valid Cal. Gas 260 NOx 11/21/24 1 EB0142277 02/08/27 P1 ppm 64.9 63.82 110.00% pass low
1 Valid Cal. Gas 260 NOx 11/21/24 2 EB0085547 05/17/26 P1 ppm 136.433 136.5 6.70% pass high
1 Valid Cal. Gas 260 SO2 11/21/24 1 EB0142277 02/08/27 P1 ppm 12.733 12.71 3.30% pass low
1 Valid Cal. Gas 260 SO2 11/21/24 2 EB0085547 05/17/26 P1 ppm 25.533 27.8 226.70% pass high
1 260 0 01/00/00 0 0 01/00/00 0 0 0 0 0.00% 0 0
1 260 0 01/00/00 0 0 01/00/00 0 0 0 0 0.00% 0 0
1 Type Code 270(Linearity Test Results)Type Code Channel Date Audit Point No. Cylinder ID
Cylinder Expiration
Date
Type of
Certification
Units of
Measurement CEM Value Cylinder
Value
Precision
%Pass/ Fail Range - High or
Low
1 270 0 01/00/00 0 0 01/00/00 0 0 0 0 0.00% 0 0
1 270 0 01/00/00 0 0 01/00/00 0 0 0 0 0.00% 0 0
1 Type Code 210(Pollutant ConcentrationExceeded Span of CEM)Type Code Channel Start Date Start Time End Date End Time Hours
1 0 210 0 1/0/00 0:00 1/0/00 0:00
1
1 None Reported
1 0 TC 220 Hours 0.00 TC 220 Hours 0.00 TC 230 Hours 0.00 Events 0.00 Hours 0.00 Events 0.00 0.00
1 1.00 TC 300 Hours 1.00 FALSE
Baghouse Stack
Baghouse Stack
Baghouse Stack
Baghouse Stack
Baghouse Stack
Type Code 210
(Pollutant Concentration
Exceeded Span of CEM)
Type Code 220
(Monitor Outage
During Point Source Operation)
Type Code 230(Manual Sample - AlternateSampling During Monitor
Outage)
Type Code 240(CEM Modifications)
Type Code 530
(Excess Emissions During
Emergency Conditions)
Type Code 550(Changes in Operation in Control Equipment When
CEM Data Not Available)
Type Code 500
(Boiler Operating Days
w/o 18 Hours of Data)
Nucor Steel
0
Type Code 450(Data Excluded)
Baghouse Stack
Baghouse Stack
Baghouse Stack
Baghouse Stack
Baghouse Stack
Baghouse Stack
0
0
Baghouse Stack
Baghouse Stack
Baghouse Stack
Baghouse Stack
0
0
0
0
Baghouse Stack
Baghouse Stack
Baghouse Stack
0
0
Baghouse Stack
Baghouse Stack
Baghouse Stack
0
0
Baghouse Stack
Point Source
None Reported
Baghouse Stack
Baghouse Stack
Baghouse Stack
0
0
0
0
0
Point Source
Point Source
Point Source
Point Source
Point Source
Baghouse Stack
Baghouse Stack
Baghouse Stack
Baghouse Stack
Baghouse Stack
Baghouse Stack
Baghouse Stack
Baghouse Stack
Baghouse Stack
Baghouse Stack
Baghouse Stack
None ReportedNone Reported None Reported None Reported None Reported None Reported
Nucor EER 4Q2024
Relative Accuracy Overview
Point Source Channel
Date of Most
Current
RATA
Date of
Preceding
RATA
Months Between
RATA's
Units
Measured CEM Value Reference Method
Value
Relative
Accuracy Pass/ Fail
Baghouse Stack CO 09/06/24 08/07/23 13 lbs/hr 208.5 211.30 77.00% Pass
Baghouse Stack NOx 09/06/24 08/07/23 13 lbs/hr 40.9 40.10 754.00% Pass
Baghouse Stack SO2 09/06/24 08/07/23 13 lbs/hr 43.9 43.80 724.00% Pass
Baghouse Stack CO 09/06/24 08/07/23 13 lbs/hr 231.1 211.30 208.00% Pass
Baghouse Stack NOx 09/06/24 08/07/23 13 lbs/hr 35.8 35.20 540.00% Pass
Baghouse Stack SO2 09/06/24 08/07/23 13 lbs/hr 44.3 44.30 795.00% Pass
*
NSPS CGA Fourth 2024
Audit Gas Ranges Audit Gas Ranges
AP1 Low AP2 Low AP1 High AP2 High
Baghouse Stack CO 11/14/24 1000 249 200 to 300
Baghouse Stack CO 11/14/24 1000 544.3 500 to 600
Baghouse Stack NOx 11/14/24 250 63.82 50 to 75
Baghouse Stack NOx 11/14/24 250 136.5 125 to 150
Baghouse Stack SO2 11/14/24 50 12.71 10 to 15
Baghouse Stack SO2 11/14/24 50 27.8 25 to 30
Baghouse Stack CO 11/21/24 1000 249 200 to 300
Baghouse Stack CO 11/21/24 1000 544.3 500 to 600
Baghouse Stack NOx 11/21/24 250 63.82 50 to 75
Baghouse Stack NOx 11/21/24 250 136.5 125 to 150
Baghouse Stack SO2 11/21/24 50 12.71 10 to 15
Baghouse Stack SO2 11/21/24 50 27.8 25 to 30
High Span Audit Gas UsedPoint Source Channel Audit Date Low Span Audit Gas Used
Nucor EER 4Q2024
Monitoring Information TC 210, 230, & 240
Type Code 210
(Pollutant Concentration Exceeded Span of CEM) - 500 (All)
*
Sum of Hours Column Labels
Row Labels (blank) Grand Total
(blank)0 0
Grand Total 0 0
*
Type Code 230
(Manual Sample - Alternate Sampling During Monitor Outage) - 500 (All)
*
Sum of Hours Column Labels
Row Labels (blank) Grand Total
(blank)0 0
Grand Total 0 0
*
Type Code 240
(CEM Modifications) - 100 (All)
*
Count of Channel Column Labels
Row Labels (blank) Grand Total
(blank)
(blank)
Grand Total
Nucor EER 4Q2024
Type Code 220
(Monitor Outage During Point Source Operation) - 600 (All)
*
Sum of Hours Column Labels
Row Labels (blank) Grand Total
(blank)
(blank)
0 0
Grand Total 0 0
Nucor EER 4Q2024
NOx *
NOx Type Code 420 (NOx) - 6000 (All)
NOx *
NOx Count of Magnitude of Emissions Column Labels
NOx Row Labels Grand Total
NOx Grand Total
CO *
CO Type Code 440
(CO) - 6000 (All)
CO *
CO Count of Magnitude of Emissions Column Labels
CO Row Labels Grand Total
CO Grand Total
O2 *
O2 Type Code 470
(TRS as O2) - 6000 (All)
O2 *
O2 Count of Magnitude of Emissions Column Labels
O2 Row Labels Grand Total
O2 Grand Total
Nucor EER 4Q2024
Type Code 500
Before February 28, 2005 (Boiler Operating Days w/o 18 Hours of Data) After February 28, 2005 (90%
Operating Hours For each 30 BOD) - 500
(All)
*
Count of Channel Column Labels
Row Labels Grand Total
Grand Total
*
Type Code 510(F-factor, EquaƟons & Conversion Factors) - 500 (All)
Count of F-factor Column Labels
Row Labels Grand Total
Grand Total
*
Type Code 520(Minimum Data Not Obtained <22/30 BODs) - 500 (All)
Count of Channel Column Labels
Row Labels Grand Total
Grand Total
*
Type Code 530(Excess Emissions During Emergency CondiƟons) - 500 (All)
Count of Date Column Labels
Row Labels Grand Total
Grand Total
*
Type Code 540(Fuel Pre-treatment Credit SO2) - 500 (All)
Count of Date Column Labels
Row Labels Grand Total
Grand Total
*
TypeCode 550(Changes in OperaƟon in Control Equipment When CEM Data Not Available) - 500 (All)
Column Labels
Row Labels Grand Total
Grand Total
Nucor EER 4Q2024