DAQ-2025-001067

1
DAQC-162-25
Site ID 10327 (B5)

MEMORANDUM

TO: FILE – INTERMOUNTAIN POWER SERVICE CORPORATION

THROUGH: Harold Burge, Major Source Compliance Section Manager

FROM: Rob Leishman, Environmental Scientist

DATE: February 10, 2025

SUBJECT: Intermountain Power Service (IPP), Major, NSPS, Title V, Acid Rain, Millard County,
FRS # UT00000049002700010

INSPECTION TYPE: State Electronic Data Report (SEDR) Review

REVIEW DATE: February 10, 2025

SOURCE LOCATION: 850 West Brush Wellman Road/Millard County

SOURCE CONTACT: Mike Ferrell – 435-864-6487

APPLICABLE
REGULATIONS: Title V Operating Permit 2700010006
DATE OF PERMIT: November 21, 2023
Date of Last Revision: November 21, 2023

SOURCE INSPECTION
EVALUATION: This review 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 IPP’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
Unit 1 2208 SO2 100% 10/07/24 10/07/24 07/16/24 Unit 1 Opacity 0.00 20 % - 6 min.
Unit 1 2208 CO2 100% 10/07/24 10/07/24 07/16/24 Unit 1 SO2 0.00 0.138 lb/mmbtu -
30 DRA
Unit 1 2208 Opacity 99% Unit 1 NOx 0.00 0.461 lb/mmbtu -
30 DRA
Unit 1 2208 SO2 100% 10/07/24 10/07/24 07/16/24 Unit 2 Opacity 0.00 20 % - 6 min.
Unit 1 2208 NOx 100% 10/07/24 10/07/24 07/13/24 Unit 2 SO2 0.00 0.138 lb/mmbtu -
30 DRA

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
Unit 1 2208 CO2 100% 10/07/24 10/07/24 07/16/24 Unit 2 NOx 0.00 0.461 lb/mmbtu -
30 DRA
Unit 2 2205 SO2 100% 10/07/24 10/07/24 07/15/24
Unit 2 2205 CO2 100% 10/07/24 10/07/24 07/15/24
Unit 2 2205 Opacity 99%
Unit 2 2205 SO2 100% 10/07/24 10/07/24 07/15/24
Unit 2 2205 NOx 100% 10/07/24 10/07/24 07/12/24
Unit 2 2205 CO2 100% 10/07/24 10/07/24 07/15/24
Summary of SO2 Emission Reduction
Percent Removal Required
% Reduction

Point
Source Channel Min Max Days in violation Status
Unit 1 SO2 93% 96% 90% 0 In compliance
Unit 2 SO2 93% 95% 90% 0 In compliance

Excess Emission Report - Hourly Summary
Point
Source Channel
Startup
&
Shutdown
Control
Equipment
Problems
Process
Problems
Other
Known
Causes
Unknown
Causes
Emission
Limit
Unit 1 Opacity 0 0 0 0 0 20 % - 6 min.
Unit 1 SO2 0 0 0 0 0 0.138 lb/mmbtu - 30 DRA
Unit 1 NOx 0 0 0 0 0 0.461 lb/mmbtu - 30 DRA
Unit 2 Opacity 0 0 0 0 0 20 % - 6 min.
Unit 2 SO2 0 0 0 0 0 0.138 lb/mmbtu - 30 DRA
Unit 2 NOx 0 0 0 0 0 0.461 lb/mmbtu - 30 DRA

CMS Performance Summary - Hourly Summary
Point
Source Channel Monitor
Malfunction
Non-monitor
Malfunction
QA
Calibrations
Other
Known
Causes
Unknown
Causes
Unit 1 SO2 0 0 0 0 0
Unit 1 CO2 0 0 0 0 0
Unit 1 Opacity 0 0 13 0 0
Unit 1 SO2 0 0 0 0 0
Unit 1 NOx 0 0 0 0 0
Unit 1 CO2 0 0 0 0 0
Unit 2 SO2 1 0 0 0 0
Unit 2 CO2 0 0 0 0 0

3
CMS Performance Summary - Hourly Summary
Point
Source Channel Monitor
Malfunction
Non-monitor
Malfunction
QA
Calibrations
Other
Known
Causes
Unknown
Causes
Unit 2 Opacity 0 0 13 0 0
Unit 2 SO2 0 0 0 0 0
Unit 2 NOx 0 0 0 0 0
Unit 2 CO2 0 0 0 0 0

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
Unit 1 - Scrubber Duct S10407 12/7/23 26.61 0.56 15.91 Low 1
Unit 1 - Scrubber Duct S10400 12/7/23 36.89 0.56 22.72 Mid 1
Unit 1 - Scrubber Duct S10426 12/7/23 59.62 0.56 39.82 High 1
Unit 2 - Scrubber Duct S10412 12/7/23 26.66 0.56 15.94 Low 1
Unit 2 - Scrubber Duct S10349 12/7/23 37.02 0.56 22.81 Mid 1
Unit 2 - Scrubber Duct S10425 12/7/23 58.40 0.56 38.81 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
Unit 1 Scrubber Duct 10/9/24 16 -0.050 -0.041
Unit 1 Scrubber Duct 10/9/24 23 -0.160 -0.140
Unit 1 Scrubber Duct 10/9/24 40 0.300 0.338
Unit 2 Scrubber Duct 10/8/24 16 -0.170 -0.150
Unit 2 Scrubber Duct 10/8/24 23 -0.220 -0.198
Unit 2 Scrubber Duct 10/8/24 39 0.230 0.253

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)
Unit 1 Scrubber Duct 10/11/22 No 0.00 0 0 Yes
Unit 2 Scrubber Duct 7/2/24 No 0.00 0.0025 0 Yes

4
Summary of SO2 Emission Reduction
Percent Removal Required Percent
Reduction

Point
Source Channel Min Max Days in violation
Unit 1 SO2 93% 96% 90% 0
Unit 2 SO2 93% 95% 90% 0

Pollutant Concentration
Exceeded Span of CEM
Monitor Outage During
Point Source Operation
Alternate
Sampling CEM Modifications
0 Hours 28 Hours 0 Hours 0 Events

SOURCE INSPECTION
SUMMARY EVALUATION: IPP 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. 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.” IPP was in
compliance during this reporting period. No further enforcement
action is recommended. IPP’s NSPS monitoring system meets the
performance standards of 40 CFR 60, Appendix B, Performance
Specifications. IPP’s acid rain monitoring system meets the
performance standards of 40 CFR 75 Acid Rain Performance
Specifications.

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
lntermountain Power Service Corporation
January 29,2025
Mr. Bryce Bird, Director
Utah Division of Air Quality
195 North 1950 West
P.O. Box 744820
Salt Lake City, Utah 841L4-4820
Dear Director Bird:
Units 1 and 2 Fourth Quarter. 2024 Emissions Report
Operatine Permit #2700010005
As part of lntermountain Power Service Corporation's reporting requirements for the lntermountain
Generating Station, we are submitting Units 1 and 2 Fourth Quarter 2024 Emissions Report in ASCII
electronic format for your review. The report has been electronically transmitted to Mr. Rob Leishman
ofthe UDAQ.
lf you have any questions or comments, please contact Mr. Michael Ferrell, Lead Technical Analyst of
Technical Services, at [phone] or [e-mail].
Sincerely,
,fit ,l 0fu
Dahl Dalton
President and Chief Operations Officer and Responsible Official
MAF/HBl:ljs
cc:Kevin Peng
Tamer Ellyahky
Trevor Johnson
I]IVISION OF AIR OUALITY
850 West Brush Wellman Road, Delta, Utah, 84624 / Telephone: [phone] / FAX: (a35) 864-6670 / Fed. l.D. #87-0388573
lntermountain Power Service Corporation
u rATi DTFARIMENTEF
January 29,2025
Mr. Bryce Bird, Director
Utah Division of Air Quality
195 North L950 West
P.O. Box 744820
Salt Lake City, Utah 841L4-4820
Dear Director Bird:
Siened Statement. Deviation Report
Units 1 and 2 Fourth Quarter 2024
As required by R307-415-5d, this signed statement is being submitted for Units 1 and 2 for the Fourth
Quarter 2024, Quarterly Report.
1. For any periods for which opacity, sulfur dioxide, or nitrogen oxide emission data are
not available, changes were not made in the operation of the emission control system.
2. The required continuous monitoring system calibration, span and drift checks, and other
periodic audits have been performed as specified.
The data used to show compliance was obtained in accordance with approved methods
and procedures of Subpart Da and is representative of plant performance.
The minimum data requirements have been met.
Compliance with the standards has been achieved during the reporting period.
Under penalty of law, all information contained in the report is truthful, accurate, and is a complete
record of all monitoring related events which occurred during the reporting period.
This letter provides notice that this report constitutes a deviation report as required under Section
l.S.2.c and Section 11.B.2.e.3 of our Title V Operating Permit #2700010006. This report is considered
prompt notification as stated in Section ll.B.2.e.3.d of our Operating Permit.
F N\i IROI.IMENTAL Q UAL ITYf-
I| 't'' -l r^' it:
trIV'SION OF AIR OUAI ITY
3.
4.
5.
850 West Brush Wellman Road, Delta, Utah, 84624 / Telephone: [phone] I FAX: [phone] / Fed. l.D. f87-0388573
Mr. Bryce Bird
January 29,2025
Page 2
I certify, based on information and belief formed after reasonable inquiry, the statements and
information in the document is true, accurate, and complete.
Sincerely,
,fit ),affi
Dahl Dalton
President and Chief Operations Officer and Responsible Official
MAF/HBI
cc: Kevin Peng
Tamer Ellyahky
Trevor Johnson
Intermountain Power 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 Dahl Dalton 02700010 435-864-4414 Michael Ferrell
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 2208
1 110 4 2024 2205
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 CO2 TECO 410i 834333319 20 0 4/15/2009 Stack
1 200 CO2 TECO 410i 834333318 20 0 4/8/2009 Scrubber Inlet
1 200 SO2 TECO 43i 534613720 500 1000 11/27/2005 Scrubber Inlet
1 200 NOx TECO 42i 534613722 500 1000 11/28/2005 Stack
1 200 Opacity Teledyne Monitor Labs Lighthawk 560 5602579 100 0 3/24/2014 Scrubber Inlet
1 200 SO2 TECO 43i 534613714 50 1000 11/28/2005 Stack
1 200 CO2 TECO 410i 834333320 20 0 4/15/2009 Stack
1 200 CO2 TECO 410i 834333317 20 0 4/15/2009 Scrubber Inlet
1 200 SO2 TECO 43i 534613725 500 1000 11/27/2005 Scrubber Inlet
1 200 NOx TECO 42i 534613723 500 1000 11/28/2005 Stack
1 200 Opacity Teledyne Monitor Labs Lighthawk 560 5602580 100 0 4/1/2014 Scrubber Inlet
1 200 SO2 TECO 43i 534613718 50 1000 11/28/2005 Stack
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
Period1 TRUE 310 Opacity 0 0.00% 0 0 0 0 0 20 % 6 min.
1 TRUE 310 SO2 0 0.00% 0 0 0 0 0 0.138 lb/mmbtu 30 DRA
1 TRUE 310 NOx 0 0.00% 0 0 0 0 0 0.461 lb/mmbtu 30 DRA
1 TRUE 310 Opacity 0 0.00% 0 0 0 0 0 20 % 6 min.
1 TRUE 310 SO2 0 0.00% 0 0 0 0 0 0.138 lb/mmbtu 30 DRA
1 TRUE 310 NOx 0 0.00% 0 0 0 0 0 0.461 lb/mmbtu 30 DRA
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 SO2 2208 0.00% 0 0 0 0 0 0
1 TRUE 300 CO2 2208 0.00% 0 0 0 0 0 0
1 TRUE 300 Opacity 2208 0.60% 13.2 0 0 13.2 0 0
1 TRUE 300 SO2 2208 0.00% 0 0 0 0 0 0
1 TRUE 300 NOx 2208 0.00% 0 0 0 0 0 0
1 TRUE 300 CO2 2208 0.00% 0 0 0 0 0 0
1 TRUE 300 SO2 2205 0.05% 1 1 0 0 0 0
1 TRUE 300 CO2 2205 0.00% 0 0 0 0 0 0
1 TRUE 300 Opacity 2205 0.60% 13.3 0 0 13.3 0 0
1 TRUE 300 SO2 2205 0.00% 0 0 0 0 0 0
1 TRUE 300 NOx 2205 0.00% 0 0 0 0 0 0
1 TRUE 300 CO2 2205 0.00% 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
1 370 Days 250 SO2 07/16/24 07/12/23 12 lbs/mmbtu 1.133 1.165 5.63% Pass
1 370 Days 250 CO2 07/16/24 07/12/23 12 CO2 11.608 11.1 5.88% Pass
1 3 Days 250 SO2 07/13/24 07/10/24 12 lbs/mmbtu 0.048 0.043 13.04% Pass
1 369 Days 250 NOx 07/13/24 07/10/23 12 lbs/mmbtu 0.207 0.197 6.62% Pass
1 369 Days 250 CO2 07/13/24 07/10/23 12 CO2 11.233 11.311 1.43% Pass
1 368 Days 250 SO2 07/15/24 07/13/23 12 lbs/mmbtu 1.193 1.126 10.40% Pass
1 368 Days 250 CO2 07/15/24 07/13/23 12 CO2 12.402 12.489 2.12% Pass
1 367 Days 250 SO2 07/12/24 07/11/23 12 lbs/mmbtu 0.043 0.041 14.71% Pass
1 367 Days 250 NOx 07/12/24 07/11/23 12 lbs/mmbtu 0.207 0.196 6.40% Pass
1 367 Days 250 CO2 07/12/24 07/11/23 12 CO2 11.333 11.233 2.67% Pass
1 0 Days 250 0 01/00/00 01/00/00 0 0 0 0 0.00% 0
Point Source
Point Source
Point Source
Unit 1
Unit 2
0
Unit 2
Unit 2
Unit 2
Unit 2
0
Unit 1
Unit 2
Unit 2
Unit 1
Unit 1
Unit 1
Unit 2
Unit 2
Unit 1
Unit 1
Unit 1
Unit 2
0
IPP
0
Unit 1
Unit 1
Unit 1
Unit 1
Unit 1
Unit 1
Unit 2
Unit 2
Unit 2
Unit 2
Unit 2
Unit 2
0
Unit 1
Unit 1
0
Unit 2
Unit 2
Unit 2
Unit 2
Unit 1
Unit 1
Unit 1
Unit 1
Unit 2
Unit 1
Intermountain Power EER 4Q2024
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
Low1 Valid Cal. Gas 260 CO2 10/07/24 1 CC309064 02/19/28 P1 PERCENT 5.08 5.1 -0.41% P LOW
1 Valid Cal. Gas 260 CO2 10/07/24 2 DT0022825 03/11/25 P1 PERCENT 11.21 11.12 0.82% P LOW
1 Valid Cal. Gas 260 CO2 10/07/24 1 SA14046 03/26/29 P1 PERCENT 5.11 5.09 0.29% P LOW
1 Valid Cal. Gas 260 CO2 10/07/24 2 DT0036279 01/28/25 P1 PERCENT 11.02 11.06 -0.40% P LOW
1 Valid Cal. Gas 260 SO2 10/07/24 1 SA14046 03/26/29 P1 PPM 123.65 121.3 1.93% P LOW
1 Valid Cal. Gas 260 SO2 10/07/24 1 CC506716 01/31/26 P1 PPM 278.16 278 0.06% P HIGH
1 Valid Cal. Gas 260 SO2 10/07/24 2 CC506716 01/31/26 P1 PPM 273.02 278 -1.79% P LOW
1 Valid Cal. Gas 260 SO2 10/07/24 2 EB0058219 07/17/27 P1 PPM 549.04 551 -0.36% P HIGH
1 Valid Cal. Gas 260 NOx 10/07/24 1 CC309064 02/19/28 P1 PPM 129.58 128.6 0.76% P LOW
1 Valid Cal. Gas 260 NOx 10/07/24 1 CC317320 03/03/28 P1 PPM 273.8 273 0.29% P HIGH
1 Valid Cal. Gas 260 NOx 10/07/24 2 DT0022825 03/11/25 P1 PPM 284.35 281 1.19% P LOW
1 Valid Cal. Gas 260 NOx 10/07/24 2 CC244820 12/06/30 P1 PPM 526.95 531 -0.76% P HIGH
1 Valid Cal. Gas 260 SO2 10/07/24 1 CC309064 02/19/28 P1 PPM 12.06 12.3 -1.95% P LOW
1 Valid Cal. Gas 260 SO2 10/07/24 2 DT0022825 03/11/25 P1 PPM 26.59 27.1 -1.87% P LOW
1 Valid Cal. Gas 260 SO2 10/07/24 1 CC317320 03/03/28 P1 PPM 274.73 274 0.27% P HIGH
1 Valid Cal. Gas 260 SO2 10/7/24 2 CC244820 12/6/30 P1 PPM 554 554 0 P HIGH
1 Valid Cal. Gas 260 CO2 10/7/24 1 CC309064 2/19/28 P1 PERCENT 5 5 0 P LOW
1 Valid Cal. Gas 260 CO2 10/7/24 2 DT0022825 3/11/25 P1 PERCENT 11 11 0 P LOW
1 Valid Cal. Gas 260 CO2 10/7/24 1 SA14046 3/26/29 P1 PERCENT 5 5 0 P LOW
1 Valid Cal. Gas 260 CO2 10/7/24 2 DT0036279 1/28/25 P1 PERCENT 11 11 0 P LOW
1 Valid Cal. Gas 260 SO2 10/7/24 1 SA14046 3/26/29 P1 PPM 121 121 0 P LOW
1 Valid Cal. Gas 260 SO2 10/7/24 1 CC506716 1/31/26 P1 PPM 274 278 0 P HIGH
1 Valid Cal. Gas 260 SO2 10/7/24 2 CC506716 1/31/26 P1 PPM 278 278 0 P LOW
1 Valid Cal. Gas 260 SO2 10/7/24 2 EB0058219 7/17/27 P1 PPM 548 551 0 P HIGH
1 Valid Cal. Gas 260 NOx 10/7/24 1 CC309064 2/19/28 P1 PPM 128 129 0 P LOW
1 Valid Cal. Gas 260 NOx 10/7/24 1 CC317320 3/3/28 P1 PPM 275 273 0 P HIGH
1 Valid Cal. Gas 260 NOx 10/7/24 2 DT0022825 3/11/25 P1 PPM 283 281 0 P LOW
1 Valid Cal. Gas 260 NOx 10/7/24 2 CC244820 12/6/30 P1 PPM 529 531 0 P HIGH
1 Valid Cal. Gas 260 SO2 10/7/24 1 CC309064 2/19/28 P1 PPM 12 12 0 P LOW
1 Valid Cal. Gas 260 SO2 10/7/24 2 DT0022825 3/11/25 P1 PPM 27 27 0 P LOW
1 Valid Cal. Gas 260 SO2 10/7/24 1 CC317320 3/3/28 P1 PPM 272 274 0 P HIGH
1 Valid Cal. Gas 260 SO2 10/7/24 2 CC244820 12/6/30 P1 PPM 551 554 0 P HIGH
1 260 0 1/0/00 0 0 1/0/00 0 0 0 0 0 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 Valid Cal. Gas 270 CO2 10/07/24 Low CC309064 02/19/28 P1 PERCENT 5.08 5.1 41.00% P LOW
1 Valid Cal. Gas 270 CO2 10/07/24 Mid DT0022825 03/11/25 P1 PERCENT 11.21 11.12 82.00% P LOW
1 Valid Cal. Gas 270 CO2 10/07/24 High CC272099 06/12/28 P1 PERCENT 18.6 18.84 127.00% P LOW
1 Valid Cal. Gas 270 NOx 10/07/24 Low CC309064 02/19/28 P1 PPM 129.58 128.6 76% P LOW
1 Valid Cal. Gas 270 NOx 10/07/24 Low CC317320 03/03/28 P1 PPM 273.8 273 29% P HIGH
1 Valid Cal. Gas 270 NOx 10/07/24 Mid DT0022825 03/11/25 P1 PPM 284.35 281 119% P LOW
1 Valid Cal. Gas 270 NOx 10/07/24 High CC272099 06/12/28 P1 PPM 445 443 45.00% P LOW
1 Valid Cal. Gas 270 NOx 10/07/24 Mid CC244820 12/06/30 P1 PPM 526.95 531 76.00% P HIGH
1 Valid Cal. Gas 270 NOx 10/07/24 High DT0008522 04/22/29 P1 PPM 874.85 892 192.00% P HIGH
1 Valid Cal. Gas 270 SO2 10/07/24 Low CC309064 02/19/28 P1 PPM 12.06 12.3 195.00% P LOW
1 Valid Cal. Gas 270 SO2 10/07/24 Mid DT0022825 03/11/25 P1 PPM 26.59 27.1 187.00% P LOW
1 Valid Cal. Gas 270 SO2 10/07/24 High CC272099 06/12/28 P1 PPM 39.59 40 102.00% P LOW
1 Valid Cal. Gas 270 SO2 10/07/24 Low CC317320 03/03/28 P1 PPM 274.73 274 27.00% P HIGH
1 Valid Cal. Gas 270 SO2 10/07/24 Mid CC244820 12/06/30 P1 PPM 554.02 554 0.00% P HIGH
1 Valid Cal. Gas 270 SO2 10/07/24 High DT0008522 04/22/29 P1 PPM 882.98 883 0.00% P HIGH
1 Valid Cal. Gas 270 CO2 10/07/24 Low CC309064 02/19/28 P1 PERCENT 5.11 5.1 22% P LOW
1 Valid Cal. Gas 270 CO2 10/07/24 Mid DT0022825 03/11/25 P1 PERCENT 11.17 11.12 44% P LOW
1 Valid Cal. Gas 270 CO2 10/07/24 High CC272099 06/12/28 P1 PERCENT 19.09 18.84 134% P LOW
1 Valid Cal. Gas 270 NOx 10/07/24 Low CC309064 02/19/28 P1 PPM 128.46 128.6 11.00% P LOW
1 Valid Cal. Gas 270 NOx 10/07/24 Low CC317320 03/03/28 P1 PPM 274.82 273 67.00% P HIGH
1 Valid Cal. Gas 270 NOx 10/07/24 Mid DT0022825 03/11/25 P1 PPM 282.99 281 71.00% P LOW
1 Valid Cal. Gas 270 NOx 10/07/24 High CC272099 06/12/28 P1 PPM 444.65 443 37.00% P LOW
1 Valid Cal. Gas 270 NOx 10/07/24 Mid CC244820 12/06/30 P1 PPM 528.64 531 44.00% P HIGH
1 Valid Cal. Gas 270 NOx 10/07/24 High DT0008522 04/22/29 P1 PPM 877.3 892 165.00% P HIGH
1 Valid Cal. Gas 270 SO2 10/07/24 Low CC309064 02/19/28 P1 PPM 12.13 12.3 138.00% P LOW
1 Valid Cal. Gas 270 SO2 10/07/24 Mid DT0022825 03/11/25 P1 PPM 26.56 27.1 200.00% P LOW
1 Valid Cal. Gas 270 SO2 10/07/24 High CC272099 06/12/28 P1 PPM 39.55 40 113.00% P LOW
1 Valid Cal. Gas 270 SO2 10/07/24 Low CC317320 03/03/28 P1 PPM 272.45 274 57.00% P HIGH
1 Valid Cal. Gas 270 SO2 10/07/24 Mid CC244820 12/06/30 P1 PPM 550.72 554 59.00% P HIGH
1 Valid Cal. Gas 270 SO2 10/07/24 High DT0008522 04/22/29 P1 PPM 883.6 883 7.00% P HIGH
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 0 0 1/0/00 0:00 1/0/00 0:00
1
1 None Reported
1 0 TC 220 Hours 27.50 TC 220 Hours 0.00 TC 230 Hours 0.00 Events 0.00 Hours 0.00 Events 0.00 0.00
1 27.50 TC 300 Hours 0.00 TRUE
None Reported None Reported Yes None Reported None Reported None Reported
Unit 1
Unit 1
Unit 1
Unit 2
Unit 2
Unit 2
Unit 2
Unit 2
Unit 2
Unit 2
Unit 2
Unit 2
Unit 2
0
Point Source
Point Source
Point Source
Yes
Unit 1
Unit 1
Unit 1
Unit 1
Unit 1
Unit 2
Unit 2
Unit 2
Unit 1
Unit 1
Type Code 550(Changes in Operation in Control Equipment When
CEM Data Not Available)
Type Code 500
(Boiler Operating Daysw/o 18 Hours of Data)
Type Code 450(Data Excluded)
Type Code 210
(Pollutant ConcentrationExceeded Span of CEM)
Type Code 220
(Monitor OutageDuring 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)
Unit 2
0
Unit 2
Unit 2
Unit 2
Unit 2
Unit 2
Unit 2
Unit 2
Unit 1
Unit 1
Unit 2
Unit 2
Unit 1
Unit 1
Unit 1
Unit 1
Unit 1
Unit 1
Unit 2
Unit 2
Unit 2
Unit 1
Unit 2
Unit 2
Unit 2
Unit 1
Unit 1
Unit 1
Unit 1
Unit 1
Unit 1
Unit 1
Unit 1
Unit 1
Unit 1
Unit 2
Unit 2
Unit 1
Unit 1
0
Intermountain Power 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 2024
Unit 1 SO2 07/16/24 07/12/23 12 lbs/mmbtu 1.133 1.17 5.63% Pass
Unit 1 CO2 07/16/24 07/12/23 12 CO2 11.608 11.10 5.88% Pass
Unit 1 SO2 07/13/24 07/10/24 12 lbs/mmbtu 0.048 0.04 13.04% Pass
Unit 1 NOx 07/13/24 07/10/23 12 lbs/mmbtu 0.207 0.20 6.62% Pass
Unit 1 CO2 07/13/24 07/10/23 12 CO2 11.233 11.31 1.43% Pass
Unit 2 SO2 07/15/24 07/13/23 12 lbs/mmbtu 1.193 1.13 10.40% Pass
Unit 2 CO2 07/15/24 07/13/23 12 CO2 12.402 12.49 2.12% Pass
Unit 2 SO2 07/12/24 07/11/23 12 lbs/mmbtu 0.043 0.04 14.71% Pass
Unit 2 NOx 07/12/24 07/11/23 12 lbs/mmbtu 0.207 0.20 6.40% Pass
Unit 2 CO2 07/12/24 07/11/23 12 CO2 11.333 11.23 2.67% Pass
*
NSPS CGA Fourth 2024
Audit Gas Ranges Audit Gas Ranges
AP1 Low AP2 Low AP1 High AP2 High
Unit 1 CO2 10/7/24 20 5.1 5 to 8
Unit 1 CO2 10/7/24 20 11.12 10 to 14
Unit 1 CO2 10/7/24 20 5.09 5 to 8
Unit 1 CO2 10/7/24 20 11.06 10 to 14
Unit 1 SO2 10/7/24 500 121.3 100 to 150
Unit 1 SO2 10/7/24 500 278 100 to 150
Unit 1 SO2 10/7/24 1000 278 200 to 300
Unit 1 SO2 10/7/24 1000 551 500 to 600
Unit 1 NOx 10/7/24 500 128.6 100 to 150
Unit 1 NOx 10/7/24 500 273 100 to 150
Unit 1 NOx 10/7/24 1000 281 500 to 600
Unit 1 NOx 10/7/24 1000 531 500 to 600
Unit 1 SO2 10/7/24 50 12.3 10 to 15
Unit 1 SO2 10/7/24 50 27.1 25 to 30
Unit 1 SO2 10/7/24 1000 274 200 to 300
Unit 1 SO2 10/7/24 1000 554 500 to 600
Unit 2 CO2 10/7/24 20 5.1 5 to 8
Unit 2 CO2 10/7/24 20 11.12 10 to 14
Unit 2 CO2 10/7/24 20 5.09 5 to 8
Unit 2 CO2 10/7/24 20 11.06 10 to 14
Unit 2 SO2 10/7/24 500 121.3 100 to 150
Unit 2 SO2 10/7/24 500 278 100 to 150
Unit 2 SO2 10/7/24 1000 278 200 to 300
Unit 2 SO2 10/7/24 1000 551 500 to 600
Unit 2 NOx 10/7/24 500 128.6 100 to 150
Unit 2 NOx 10/7/24 500 273 100 to 150
Unit 2 NOx 10/7/24 1000 281 500 to 600
Unit 2 NOx 10/7/24 1000 531 500 to 600
Unit 2 SO2 10/7/24 50 12.3 10 to 15
Unit 2 SO2 10/7/24 50 27.1 25 to 30
Unit 2 SO2 10/7/24 1000 274 200 to 300
Unit 2 SO2 10/7/24 1000 554 500 to 600
*
Acid Rain Audit Linearity Fourth 2024
Low Span Gas Ranges High Span Gas Ranges
Low Mid High Low Mid High
Unit 1 CO2 10/7/24 20 5.1 4 to 6
Unit 1 CO2 10/7/24 20 11.12 10 to 12
Unit 1 CO2 10/7/24 20 18.84 16 to 20
Unit 1 NOx 10/7/24 500 128.6 100 to 150
Unit 1 NOx 10/7/24 500 273 1000 273 200 to 300
Unit 1 NOx 10/7/24 500 281 250 to 300
Unit 1 NOx 10/7/24 500 443 400 to 500
Unit 1 NOx 10/7/24 1000 531 500 to 600
Unit 1 NOx 10/7/24 1000 892 800 to 1000
Unit 1 SO2 10/7/24 50 12.3 10 to 15
Unit 1 SO2 10/7/24 50 27.1 25 to 30
Unit 1 SO2 10/7/24 50 40 40 to 50
Unit 1 SO2 10/7/24 1000 274 200 to 300
Unit 1 SO2 10/7/24 1000 554 500 to 600
Unit 1 SO2 10/7/24 1000 883 800 to 1000
Unit 2 CO2 10/7/24 20 5.1 4 to 6
Unit 2 CO2 10/7/24 20 11.12 10 to 12
Unit 2 CO2 10/7/24 20 18.84 16 to 20
Unit 2 NOx 10/7/24 500 128.6 100 to 150
Unit 2 NOx 10/7/24 1000 273 200 to 300
Unit 2 NOx 10/7/24 500 281 250 to 300
Unit 2 NOx 10/7/24 500 443 400 to 500
Unit 2 NOx 10/7/24 1000 531 500 to 600
Unit 2 NOx 10/7/24 1000 892 800 to 1000
Unit 2 SO2 10/7/24 50 12.3 10 to 15
Unit 2 SO2 10/7/24 50 27.1 25 to 30
Unit 2 SO2 10/7/24 50 40 40 to 50
Unit 2 SO2 10/7/24 1000 274 200 to 300
Unit 2 SO2 10/7/24 1000 554 500 to 600
Unit 2 SO2 10/7/24 1000 883 800 to 1000
*
Audit Gas Used
Point Source Channel Audit Date Low Span
Point Source Channel Audit Date Low Span
Audit Gas Used High Span Audit Gas Used
High SpanAudit Gas Used
Intermountain Power EER 4Q2024
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
Unit 1 Scrubber
Duct S10407 12/7/23 27 0.56 15.91
Low 1
Unit 1 Scrubber
Duct S10400 12/7/23 37 0.56 22.72
Mid 1
Unit 1 Scrubber
Duct S10426 12/7/23 60 0.56 39.82 High 1
Unit 2 Scrubber
Duct S10412 12/7/23 26.66 0.56 15.94
Low 1
Unit 2 Scrubber
Duct S10349 12/7/23 37.02 0.56 22.81
Mid 1
Unit 2 Scrubber
Duct S10425 12/7/23 58.4 0.56 38.81
High 1
*
Opacity Monitor Response (Average of 5)
Low Range Mid Range High Range
Unit 1 Scrubber
Duct 10/9/24 16 -0.050 0.026 0.012 -0.041
Unit 1 Scrubber
Duct 10/9/24 23 -0.160 0.050 0.022 -0.140
Unit 1 Scrubber
Duct 10/9/24 40 0.300 0.082 0.036 0.338
Unit 2 Scrubber
Duct 10/8/24 16 -0.170 0.056 0.024 -0.150
Unit 2 Scrubber
Duct 10/8/24 23 -0.220 0.053 0.023 -0.198
Unit 2 Scrubber
Duct 10/8/24 39 0.230 0.052 0.023 0.253
*
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)
Unit 1 Scrubber
Duct 10/11/22 No 0.000 0.000 0.000 Yes
Unit 2 Scrubber
Duct 7/2/24 No 0.003 0.003 0.001 Yes
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)
Intermountain Power 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
Intermountain Power EER 4Q2024
Type Code 220
(Monitor Outage During Point Source Operation) - 600 (All)
*
Sum of Hours Column Labels
Row Labels 723 721 Grand Total
Unit 1
Opacity
Daily Opacity Calibration Check.9.20 9.20
Opacity Monitor Quarterly Procedure 3 Audit.3.90 3.90
System calibration.0.10 0.10
Unit 2
Opacity
Daily Opacity Calibration Check.9.20 9.20
Opacity Monitor Quarterly Procedure 3 Audit.4.00 4.00
System calibration.0.10 0.10
InletSO2
S1 Inlet CEM SO2 analyzer high range calibration out of control. Dilution
eductor blockage, cleaned eductor. System calibrated and return to
service.
1.00 1.00
Grand Total 26.50 1.00 27.50
Intermountain Power EER 4Q2024
Opy *
Opy Count of Magnitude of Emissions Column Labels
Opy Row Labels Grand Total
Opy Grand Total
SO2 *
SO2 Type Code 410 (SO2) - 6000 (All)
SO2 *
SO2 Count of Magnitude of Emissions Column Labels
SO2 Row Labels Grand Total
SO2 Grand Total
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
Dat Ex *
Dat Ex Type Code 450
(Data Excluded) - 6000 (All)
Dat Ex *
Dat Ex Count of Channel Column Labels
Dat Ex Row Labels 724 Grand Total
Dat Ex Unit 2
Dat Ex InletSO2 6 6
Dat Ex
Emissions data excluded from the calculation of averaged
emissions due to a NBOD. Unit 2 Unit tripped off-line on November
16th and November 23 due to activation of the thrust bearing wear
detection test. A pressure switch was replaced on the 16th and a
solenoid was replaced on the 23rd. Unit 2 tripped off-line
December 6th due to afire detection alarm in the Primary air Fan
Variable Frequency Drive enclosure. Fire dection system was
repaired. No excess emission ouccured during the trip and restart
events. The bag house remained in service during these events.
6 6
Dat Ex InletCO2 6 6
Dat Ex
Emissions data excluded from the calculation of averaged
emissions due to a NBOD. Unit 2 Unit tripped off-line on November
16th and November 23 due to activation of the thrust bearing wear
detection test. A pressure switch was replaced on the 16th and a
solenoid was replaced on the 23rd. Unit 2 tripped off-line
December 6th due to afire detection alarm in the Primary air Fan
Variable Frequency Drive enclosure. Fire dection system was
repaired. No excess emission ouccured during the trip and restart
events. The bag house remained in service during these events.
6 6
Dat Ex SO2 6 6
Intermountain Power EER 4Q2024
Dat Ex
Emissions data excluded from the calculation of averaged
emissions due to a NBOD. Unit 2 Unit tripped off-line on November
16th and November 23 due to activation of the thrust bearing wear
detection test. A pressure switch was replaced on the 16th and a
solenoid was replaced on the 23rd. Unit 2 tripped off-line
December 6th due to afire detection alarm in the Primary air Fan
Variable Frequency Drive enclosure. Fire dection system was
repaired. No excess emission ouccured during the trip and restart
events. The bag house remained in service during these events.
6 6
Dat Ex NOx 6 6
Dat Ex
Emissions data excluded from the calculation of averaged
emissions due to a NBOD. Unit 2 Unit tripped off-line on November
16th and November 23 due to activation of the thrust bearing wear
detection test. A pressure switch was replaced on the 16th and a
solenoid was replaced on the 23rd. Unit 2 tripped off-line
December 6th due to afire detection alarm in the Primary air Fan
Variable Frequency Drive enclosure. Fire dection system was
repaired. No excess emission ouccured during the trip and restart
events. The bag house remained in service during these events.
6 6
Dat Ex CO2 6 6
Dat Ex
Emissions data excluded from the calculation of averaged
emissions due to a NBOD. Unit 2 Unit tripped off-line on November
16th and November 23 due to activation of the thrust bearing wear
detection test. A pressure switch was replaced on the 16th and a
solenoid was replaced on the 23rd. Unit 2 tripped off-line
December 6th due to afire detection alarm in the Primary air Fan
Variable Frequency Drive enclosure. Fire dection system was
repaired. No excess emission ouccured during the trip and restart
events. The bag house remained in service during these events.
6 6
Dat Ex Grand Total 30 30
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
Intermountain Power 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 SO2 NOx Grand Total
Unit 1
1800 3 1 4
Unit 2
1800 3 1 4
Grand Total 6 2 8
*
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