DAQ-2025-000880

1
DAQC-166-25
Site ID 10346 (B5)

MEMORANDUM

TO: FILE – KENNECOTT UTAH COPPER CORPORATION

THROUGH: Harold Burge, Major Source Compliance Section Manager

FROM: Rob Leishman, Environmental Scientist

DATE: February 11, 2025

SUBJECT: Kennecott Utah Copper Corporation (Kennecott), Major, SIP, Title V, Salt Lake
County, FRS # UT0000004903500030

INSPECTION TYPE: State Electronic Data Report (SEDR) Review

REVIEW DATE: February 11, 2025

SOURCE LOCATION: Magna, Salt Lake County

SOURCE CONTACT: Austin Keough – 801-569-6331
Andy Bellard – 385-485-9017

APPLICABLE
REGULATIONS: Title V Operating Permit
Permit Number: 3500030004
Date of Permit: September 18, 2020
Date of Last Revision: February 5, 2025

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 Kennecott’s relative accuracy
performance specification test review memorandum.

SOURCE REVIEW EVALUATION:

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
Conc
Dryer 1633 Opacity 99% Conc
Dryer Opacity 0.00 15 % - 6 min avg
Main
Stack 2208 NOx 100% 11/19/24 05/29/24 Main
Stack Opacity 17.10 20 % - 6 min avg

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
Main
Stack 2208 Opacity 100% Tail Gas Opacity 0.00 15 % - 6 min avg
Main
Stack 2208 SO2 100% 11/19/24 05/29/24 Main
Stack SO2 3.00 552 lb/hr - 3 HR
RAvg
Tail Gas 1994 Opacity 100% Main
Stack SO2 0.00 422 lb/hr - 24 HR
BAvg
Tail Gas 1994 SO2 95% 11/19/24 06/18/24 Tail Gas SO2 0.00 250 ppm - 6 HR
BAvg
Tail Gas SO2 0.00 170 ppm - 24 HR
BAvg
Main
Stack NOx 0.00 35 lb/hr - Ann Avg
Main
Stack NOx 0.00 154 lb/hr - 24HR
BAvg

Excess Emission Report - Hourly Summary
Point
Source Channel
Startup
&
Shutdown
Control
Equipment
Problems
Process
Problems
Other
Known
Causes
Unknown
Causes
Emission
Limit
Conc Dryer Opacity 0 0 0 0 0 15 % - 6 min avg
Main Stack Opacity 0 6.3 10.8 0 0 20 % - 6 min avg
Tail Gas Opacity 0 0 0 0 0 15 % - 6 min avg
Main Stack SO2 3 3 0 0 0 552 lb/hr - 3 HR RAvg
Main Stack SO2 0 0 0 0 0 422 lb/hr - 24 HR BAvg
Tail Gas SO2 0 0 0 0 0 250 ppm - 6 HR BAvg
Tail Gas SO2 0 0 0 0 0 170 ppm - 24 HR BAvg
Main Stack NOx 0 0 0 0 0 35 lb/hr - Ann Avg
Main Stack NOx 0 0 0 0 0 154 lb/hr - 24HR BAvg

CMS Performance Summary - Hourly Summary
Point
Source Channel Monitor
Malfunction
Non-monitor
Malfunction
QA
Calibrations
Other
Known
Causes
Unknown
Causes
Conc Dryer Opacity 0 0 21 0 0
Main Stack NOx 0 0 1 0 0
Main Stack Opacity 0 0 3 0 0
Main Stack SO2 0 0 1 0 0
Tail Gas Opacity 0 0 1 3 0
Tail Gas SO2 0 0 98 0 0

3
Type Code 280 (COMS Attenuator Filters) Procedure 3
Point Source &
Location
Attenuator
I.D.
Attenuator
Certification
Date
Certified
Attenuator
Opacity
OPLR,
SECR,
or
PLCF,
Corrected
Opacity
Value
Range
Low,
Mid, &
High
Certification
1-year or 5-
year
Conc Dryer - Duct S11843 10/7/24 8.24 0.00 0 low 1
Conc Dryer - Duct S11834 10/7/24 16.41 0.00 0 mid 1
Conc Dryer - Duct S11812 10/7/24 25.20 0.00 0 high 1
Tail Gas - Duct S12476 10/7/24 8.40 0.00 0 low 1
Tail Gas - Duct S12485 10/7/24 16.90 0.00 0 mid 1
Tail Gas - Duct S12494 10/7/24 24.85 0.00 0 high 1

Type Code 281 (Procedure 3 - COMS Filter Audit Calibration Error)
Point
Source Location Audit Date
Opacity Monitor Response
(Average of 5) Mean Difference Calibration
Error (≤ 3%) Low Mid High
Conc Dryer Duct 11/20/24 9 0.930 1.690
Conc Dryer Duct 11/20/24 17 0.600 0.680
Conc Dryer Duct 11/20/24 26 1.230 1.530
Tail Gas Duct 11/20/24 9 0.140 0.270
Tail Gas Duct 11/20/24 17 0.390 0.590
Tail Gas Duct 11/20/24 26 1.080 1.150

Type Code 282 (Annual Zero Alignment Audit) Procedure 3
Point
Source Location Audit
Date
Alternative Zero
Alignment
(Yes or No)
COM Clear
Condition
Zero Response
(CCZR)
COM
Simulated
Zero
Response
(CSZR)
Zero
Alignment
Error
Difference
(CCZR)-
(CSZR)
Adjustment to
COM
Simulated Zero
Response
(CSZR)
(Yes or No)
Conc Dryer Duct 8/29/23 Yes 0.00 0.21 0 No
Tail Gas Duct 8/29/23 Yes 0.38 0.11 0 No

Pollutant Concentration
Exceeded Span of CEM
Monitor Outage During
Point Source Operation
Alternate
Sampling CEM Modifications
0 Hours 128 Hours 0 Hours 0 Events

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

4
CURRENT
RECOMMENDATIONS: All deviations appear to be a result of breakdown or process related problems
that do not warrant issuing a violation. Periods of excess emissions that were
recorded by the CMS in service on each point source during this reporting
period are summarized in the SEDR and described in Pivot Table 400 “Excess
Emissions Review.”

Kennecott was in compliance during this reporting period. No further
enforcement action is recommended.

Kennecott’s NSPS monitoring system meets the performance standards of 40
CFR 60, Appendix B Performance Specifications.

HIGH PRIORITY
VIOLATOR (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: Excel spreadsheet review
Kennecott 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
Contact
1 100 Simon Mallard 03500030 801-569-6331 Cassady Kristensen
1 100 0 0 0 0
1 Type Code 110
(Point Source Identification)Type Code Point Source
Quarter
1 - 4 Year
Point Source
Operating Hrs. in
Quarter
1 110 4 2024 1633
1 110 4 2024 2208
1 110 4 2024 2208
1 110 4 2024 2208
1 110 4 2024 1994
1 110 4 2024 1994
1 110 4 2024 1994
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 Opacity Teledyne Monitor Labs IncLightHawk 560ES 5602949 0 100 5/18/2018 Duct
1 200 NOx Thermo 42iQ 12127413438 0 100 3/23/2022 Stack
1 200 Opacity Teledyne Monitor Labs Inc.LightHawk 560ES 5603123 0 100 7/11/2019 Stack
1 200 SO2 Thermo Scientific 43iQ 12127413439 0 100 3/23/2022 Stack
1 200 SO2 Thermo Scientific 43iQ 12127413439 0 10000 3/23/2022 Stack
1 200 Opacity Teledyne Monitor Labs IncLightHawk 560ES 5603122 0 100 7/17/2019 Duct
1 200 SO2 Unisearch DOAS AR2047 DAS22-001 0 150 8/3/2022 Duct
1 200 SO2 Unisearch DOAS AR2047 DAS22-001 0 1500 8/3/2022 Duct
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 Opacity 0 0.00% 0 0 0 0 0 15 % 6 min avg
1 TRUE 310 Opacity 17.1 0.77% 0 6.3 10.8 0 0 20 % 6 min avg
1 TRUE 310 Opacity 0 0.00% 0 0 0 0 0 15 % 6 min avg
1 TRUE 310 SO2 6 0.27% 3 3 0 0 0 552 lb/hr 3 HR RAvg
1 TRUE 310 SO2 0 0.00% 0 0 0 0 0 422 lb/hr 24 HR BAvg
1 TRUE 310 SO2 0 0.00% 0 0 0 0 0 250 ppm 6 HR BAvg
1 TRUE 310 SO2 0 0.00% 0 0 0 0 0 170 ppm 24 HR BAvg
1 TRUE 310 NOx 0 0.00% 0 0 0 0 0 35 lb/hr Ann Avg
1 TRUE 310 NOx 0 0.00% 0 0 0 0 0 154 lb/hr 24HR BAvg
1 310 0 0 0 0 0 0 0 0 0
1 Type Code 300 (CMS
Performance 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
Causes
1 TRUE 300 Opacity 1633 1.28% 20.9 0 0.2 20.7 0 0
1 TRUE 300 NOx 2208 0.05% 1 0 0 1 0 0
1 TRUE 300 Opacity 2208 0.14% 3 0 0 3 0 0
1 TRUE 300 SO2 2208 0.05% 1 0 0 1 0 0
1 TRUE 300 Opacity 1994 0.20% 4 0 0 1 3 0
1 TRUE 300 SO2 1994 4.91% 98 0 0 98 0 0
1 300 0 0 0 0 0 0
Point Source
Point Source
Conc Dryer
Main Stack
Main Stack
Main Stack
Tail Gas
Tail Gas
Tail Gas
0
Tail Gas
Main Stack
Main Stack
Main Stack
Tail Gas
Tail Gas
0
Conc Dryer
Main Stack
Main Stack
Kennecott Copper
0
Conc Dryer
Main Stack
Main Stack
Main Stack
Main Stack
Tail Gas
Tail Gas
Tail Gas
0
Tail Gas
Tail Gas
Main Stack
Main Stack
0
Conc Dryer
Main Stack
Kennecott EER 4Q2024
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
1 265 Days 250 SO2 06/18/24 09/27/23 9 ppmvd 55.11 38.22 708.00% Pass
1 244 Days 250 NOx 05/29/24 09/28/23 8 lb/hr 24.1 23.9 488.00% Pass
1 244 Days 250 SO2 05/29/24 09/28/23 8 lb/hr 186.6 173.5 1292.00% Pass
1 244 Days 250 SO2 05/29/24 09/28/23 8 lb/hr 186.6 173.5 1292.00% Pass
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 of
Measurement CEM Value Cylinder
Value
Precision
%Pass/ Fail Range - High or
Low
1 Valid Cal. Gas 260 NOx 11/19/24 1 CC741696 06/13/25 P1 ppmv 25.03 26.1 -410.00% Pass Low
1 Valid Cal. Gas 260 NOx 11/19/24 2 EB0042599 06/13/30 P1 ppmv 54.45 56.06 -287.00% Pass Low
1 Valid Cal. Gas 260 SO2 11/19/24 1 CC741696 06/13/25 P1 ppmv 23.31 24.91 -644.00% Pass Low
1 Valid Cal. Gas 260 SO2 11/19/24 2 EB0042599 06/13/30 P1 ppmv 56.72 55.38 241.00% Pass Low
1 Valid Cal. Gas 260 SO2 11/19/24 1 EB0095882 01/03/30 P1 ppmv 2527.33 2504 93.00% Pass High
1 Valid Cal. Gas 260 SO2 11/19/24 2 ALM025983 01/24/30 P1 ppmv 5583.33 5499 153.00% Pass High
1 Valid Cal. Gas 260 SO2 11/19/24 1 CC284500 06/13/30 P1 ppmv 31.7 32.7 -306.00% Pass Low
1 Valid Cal. Gas 260 SO2 11/19/24 2 SG9170530BAL 01/03/31 P1 ppmv 73.4 75.4 -265.00% Pass Low
1 Valid Cal. Gas 260 SO2 11/19/24 1 CC20272 06/13/30 P1 ppmv 291 330 -1182.00% Pass High
1 Valid Cal. Gas 260 SO2 11/19/24 2 CC118075 07/08/30 P1 ppmv 636.67 716 -1108.00% Pass High
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
Type Code 210
(Pollutant Concentration
Exceeded Span of CEM)
Type Code Channel Start Date Start Time End Date End Time Hours
1 0 0 0 1/0/00 0:00 1/0/00 0:00
1
1 None Reported
1 0 TC 220 Hours 127.90 TC 220 Hours 0.00 TC 230 Hours 0.00 Events 0.00 Hours 0.00 Events 0.00 0.00
1 127.90 TC 300 Hours 0.00 TRUE
None Reported None Reported None Reported None Reported None Reported None Reported
Point Source
Point Source
Point Source
Point Source
Yes
Tail Gas
0
Main Stack
Main Stack
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)
Type Code 450
(Data Excluded)
Type Code 210
(Pollutant Concentration
Exceeded Span of CEM)
Type Code 220
(Monitor Outage
During Point Source Operation)
Type Code 230
(Manual Sample - Alternate
Sampling During Monitor
Outage)
Type Code 240
(CEM Modifications)
Type Code 530
(Excess Emissions During
Emergency Conditions)
Main Stack
Main Stack
Main Stack
0
Tail Gas
Main Stack
Main Stack
Main Stack
Main Stack
Tail Gas
Tail Gas
Tail Gas
0
0
Kennecott 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
Tail Gas SO2 06/18/24 09/27/23 9 ppmvd 55.11 38.22 708.00% Pass
Main Stack NOx 05/29/24 09/28/23 8 lb/hr 24.1 23.90 488.00% Pass
Main Stack SO2 05/29/24 09/28/23 8 lb/hr 186.6 173.50 1292.00% Pass
Main Stack SO2 05/29/24 09/28/23 8 lb/hr 186.6 173.50 1292.00% Pass
*
NSPS CGA Fourth 2024
Audit Gas Ranges Audit Gas Ranges
AP1 Low AP2 Low AP1 High AP2 High
Main Stack NOx 11/19/24 100 26.1 20 to 30
Main Stack NOx 11/19/24 100 56.06 50 to 60
Main Stack SO2 11/19/24 100 24.91 20 to 30
Main Stack SO2 11/19/24 100 55.38 50 to 60
Main Stack SO2 11/19/24 10000 2504 2000 to 3000
Main Stack SO2 11/19/24 10000 5499 5000 to 6000
Tail Gas SO2 11/19/24 150 32.7 30 to 45
Tail Gas SO2 11/19/24 150 75.4 75 to 90
Tail Gas SO2 11/19/24 1500 330 300 to 450
Tail Gas SO2 11/19/24 1500 716 750 to 900
*
Type Code 280 (COMS Attenuator Filters) Procedure 3
Point Source Location
Attenuator
I.D.
Attenuator
Certification Date
Certified Attenuator
Opacity
OPLR,
SECR, or
PLCF,
Corrected Opacity
Value
Range
Low, Mid, & High
Certification
1-year or 5-year
Conc Dryer Duct S11843 10/7/24 8 0 0 low 1
Conc Dryer Duct S11834 10/7/24 16 0 0 mid 1
Conc Dryer Duct S11812 10/7/24 25 0 0 high 1
Tail Gas Duct S12476 10/7/24 8.4 0 0 low 1
Tail Gas Duct S12485 10/7/24 16.9 0 0 mid 1
Tail Gas Duct S12494 10/7/24 24.85 0 0 high 1
*
Opacity Monitor Response (Average of 5)
Low Range Mid Range High Range
Conc Dryer Duct 11/20/24 9 0.930 0.310 0.760 1.690
Conc Dryer Duct 11/20/24 17 0.600 0.030 0.080 0.680
Conc Dryer Duct 11/20/24 26 1.230 0.120 0.300 1.530
Tail Gas Duct 11/20/24 9 0.140 0.060 0.140 0.270
Tail Gas Duct 11/20/24 17 0.390 0.080 0.190 0.590
Tail Gas Duct 11/20/24 26 1.080 0.030 0.070 1.150
*
Point Source Location Audit Date
Alternitive Zero
Alignment
(Yes or No)
COM Clear
Condition Zero
Response
(CCZR)
COM Simulated
Zero Response
(CSZR)
Zero Alignment
Error Difference
(CCZR)-(CSZR)
Adjustment to COM
Simulated Zero
Response
(CSZR)
(Yes or No)
Conc Dryer Duct 8/29/23 Yes 0.000 0.210 0.210 No
Tail Gas Duct 8/29/23 Yes 0.380 0.110 0.270 No
Type Code 282 (Procedure 3 - Annual Zero Alignment Audit)
Point
Source Location Audit Date Mean Difference Standard Deviation
Confidence
Coefficient
Calibration
Error (≤ 3%)
Type Code 281 (Procedure 3 - COMS Filter Audit Calibration Error)
Point Source Channel Audit Date Low Span Audit Gas Used High Span Audit Gas Used
Kennecott 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
Kennecott EER 4Q2024
Type Code 220
(Monitor Outage During Point Source Operation) - 600 (All)
*
Sum of Hours Column Labels
Row Labels 723 722 724 Grand Total
Conc Dryer
Opacity
Calibration 17.1 17.1
Communication Problem 0.2 0.2
Opacity Audit 3.6 3.6
Main Stack
Opacity
Opacity Audit 3.0 3.0
SO2
Calibration Gas Audit 1.0 1.0
NOx
Calibration Gas Audit 1.0 1.0
Tail Gas
Opacity
Opacity Audit 1.0 1.0
Process material on monitoring equipment 3.0 3.0
SO2
Calibration 84.0 84.0
Calibration Gas Audit 3.0 3.0
Bad Calibration 11.0 11.0
Grand Total 124.7 0.2 3.0 127.9
Kennecott EER 4Q2024
Opy *
Opy Count of Magnitude of Emissions Column Labels
Opy Row Labels 702 703 Grand Total
Opy Main Stack 63 108 171
Opy 95 Air/Fuel Ratio Problems 58 58
Opy Online maintenance 50 50
Opy Baghouse Problem 30 30
Opy Secondary Gas System Trip 12 12
Opy Scrubber Problem 21 21
Opy Grand Total 63 108 171
SO2 *
SO2 Type Code 410 (SO2) - 6000 (All)
SO2 *
SO2 Count of Magnitude of Emissions Column Labels
SO2 Row Labels 701 702 Grand Total
SO2 Acid Plant Trip - Pump
SO2 Main Stack 3 3
SO2 Scrubber Problem
SO2 Main Stack 3 3
SO2 Grand Total 3 3 6
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
NOx d *
NOx d Type Code 421 (Daily NOx Emissions) - 500 (All)
NOx d *
NOx d Count of Reason Code Column Labels
NOx d Row Labels Grand Total
NOx d Grand Total
Kennecott 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, Equations & 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 Conditions) - 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 Operation in Control Equipment When CEM Data Not
Available) - 500
(All)
Column Labels
Row Labels Grand Total
Grand Total