DAQ-2025-002235

fii\@,/.
October 30,2024
Bryce Bird, Director
Utah Division of Air Quality
195 North 1950 West
P.O. Box 144820
Salt Lake ciry, uT 84114-4820
Re: New Source Performance Standard (NSPS). Subpart Ja - April l. 2024 - Seotember 30. 2024
Dear Mr. Bird:
Attached is Tesoro Refining & Marketing Company, LLC's NSPS Subpart Ja semi-annual report as
required by 40 CFR 60.108a(d) and 40 CFR 60.7(c) for the Salt Lake City (SLC) Refinery.
This report addresses operations from April I ,2024 through September 30,2024 for the following
sources:
r All affected refinery flares, including the North Refinery Flare, South Refinery Flare and the
Sulfur Recovery Unit (SRU) Flare.
o The refinery fuel gas system and Cogeneration Turbine & Heat Recovery Steam Generation
(HRSG) Systems, in accordance with the Utah PMz s SIP Subsection IX.H.1, which has been
approved by UDAQ.o The Fluidized Cataly'tic Cracking Unit (FCU), CO Boiler, Electrostatic Precipitator (ESP), and
Wet Gas Scrubber (WGS) for SO:, NOx, CO and PM, in accordance with refinery's Approval
Order DAQE-AN103350075-18 issued by UDAQ.
Refinery Flares:
The North and South refinery flares are served by a common Flare Gas Recovery System (FGRS). These
two flares serve all process units in the refinery, except for the SRU and the Tailgas Treatment Unit; these
two process units are served by a dedicated SRU Flare. These three flares have been modified under
$60.100a(c)(l) and are therefore subject to NSPS Subpart Ja. This report addresses the following Work
Practice Standards at $60.103a(h), $60.103a(c)( I )(i), and $60.103a(c)( I Xii) as applicable for the
refinery's North, South, and SRU Flares during the reporting period.
Due to a shared FCRS, Tesoro is complying with the SOz work practice standard in $60.103a(c)( I )(i) at
the North and South Flares by comparing cumulative SOz emissions from both flares to the 500 lb SOz
Root Cause Analysis (RCA) and Corrective Action Analysis (CAA) applicability trigger. Similarly,
Tesoro is complying with the Work Practice Standard at $60.103a(cX I Xii) by comparing cumulative flare
gas sent to the two flares against the RCA/CAA applicability trigger of 500,000 scf/24-hour period in
excess of the baseline scenarios identified in the refinery's NSPS Subpart Ja Flare Management Plan.
Tesoro is complying with the Work Practice Standard at $60.103a(h) bV using a total sulfur analyzer in
lieu of a HzS analyzer at the SRU Flare, in accordance with $60.107a(a)(2)(v).
ENVIHONMEN]AL
Jdrr.rboqrdtr.ry
Tesoro Refining &
Marketing Company
DIPANTMENT OF
OUAUTY
LLC
OCT 30 2024 t
*qna cleit/era)
DIVISION OF AIR OUALTTY
HaNo DelrvpRso
B-2-10335
The refinery most recently submitted an update to its NSPS Subpart Ja Flare Management Plan to USEPA
on August 28,2022. In accordance with $60.103a(b)(2), Tesoro has operated in accordance with the
latest updated plan during the reporting period. Since the end of the reporting period, an additional Flare
Management Plan has been submitted and will be in effect during subsequent reporting periods.
During the reporting period, there were no exceedances of the 500 lb SOZl24-hour period Work Practice
Standard at $60. I 03a(c)( I )(i) or the 500,000 scfl24-hour period Work Practice Standard at
$60.103a(c)( I Xii), based on observed cumulative gas flared concurrently from the North and South flares
or SRU flare. Determination of flaring events that exceeded the 500,000 scf/24-hour period Work
Practice Standard at $60. l03a(cX I Xii) consider applicable alternative operating scenarios established
pursuant to $60. I 03a(a)(a)(ii).
Details of any exceedances of the H:S 3-hour rolling average limit are included in the quarterly State
Electronic Data Reports.
Refinery Fuel Cas System:
Tesoro is also subject to requirements within NSPS Subpart Ja for the V-917 refinery fuel gas balance
drum. In accordance with the UDAQ-approved Utah PMz s Moderate Non-Attainment State
Implementation Plan (SIP) Section IX.H.l l(g)(ii), which applies to petroleum refineries, Tesoro shall
comply with specified applicable requirements within NSPS Subpart Ja for HzS content within refinery
fuel gas. There were no exceedances of the 365-day rolling average limit during the reporling period.
Details of any exceedances of the HzS 3-hour rolling average limit are included in the quarterly State
Electronic Data Reports for the 2nd Quarter 2024 and 3rd Quarter 2024.
Cogeneration Turbine & HRSG Systems:
Tesoro has interpreted from the Utah PM: s Moderate Non-Attainment SIP that the East and West
Cogeneration Turbines are subject to the same aforementioned provisions as the V-917 fuel gas system.
Furthermore, SIP condition IX.H.l2(p)(iii)(c) applies specifically to the East and West Cogeneration
Turbines and allow use of a SOz/O: or HzS CEMS. Each turbine fires a mixture of utility natural gas and
sweet fuelgas, generated from amine treating of sour fuelgas in the SRU. This fuelgas differs in
composition from that in the V-917 refinery fuelgas balance drum. In addition, downstream of each
turbine, a HRSG system is installed for steam production using the turbine exhaust flue gas and additional
refinery fuelgas from V-917. Tesoro operates a H:S Continuous Emissions Monitoring System (CEMS)
to measure the mixture of natural gas and fuel gas fired at the Cogen turbine sections; both Cogen process
trains (i.e. East and West) fire the same mixture of fuel, therefore the monitoring is achieved with one
analyzer. As noted previously, the refinery fuel gas fired at the HRSGs is monitored with the H:S CEMS
installed on the V-917 fuelgas drum. Therefore, Tesoro is complying with the existing HzS standard in
SIP Section IX.H.I I (g)(ii) and condition IX.H.l2(p)(iii)(c) by complying with $60.102a(g)( I )(ii) for each
fuel gas mixture. This monitoring approach was conducted in accordance with the Custom Fuel
Monitoring Schedule Update to NSPS Subparts JlJaand GG, approved by EPA Region 8 on April 5,
2018.
There were no exceedances of the HzS 365-day rolling average limit within $60.102a(g)(lXii) from the
East and West Cogeneration trains during the reporting period. Details of any exceedances of the HzS 3-
hour rolling average limit within $60.102a(g)(lXii) have been included in the State Electronic Data
Reports for the 2nd Quarter 2024 and 3rd Quarter 2024.
FCU Regenerator/CO Boiler/ESP/WGS:
Tesoro is subject to requirements within NSPS Subpart Ja for the FCU affected facility, consisting of the
FCU Regenerator, CO Boiler, ESP, and WGS. Effective January l, 2018, this equipment is regulated by
Subpart Ja for PM, CO, and SO:. Stack testing was conducted to establish operating limits at the
Regenerator, ESP, and Wet Gas Scrubber for PM on May 1,2024; the most recent operating limits
became effective on April 1,2024.
Details of any exceedances of the applicable CO limit (corrected to 0% Oz) within $60.102a(b)(4) for the
FCU Regenerator/CO Boiler/ESP/WGS during the reporting period have been included in the State
Electronic Data Reports for the 2nd Quarter 2024 and 3'd Quarter 2024. During the aforementioned
reporting period, any deviations from allowable operating limits within $60.102a(c)(1)(i) and
$60. l02a(c)( I Xii) for the FCU Regenerator/CO Boiler/ESPiWGS are included in the summary report
tables and attachment tables (if applicable).
Alignment with State Ouarterly Reports:
Monitoring system performance for all regulated CEMS and Continuous Parametric Monitoring Systems
(CPMS) at the North Flare (HuS, Flow and Total Sulfur), South Flare (HzS, Flow and Total Sulfur), SRU
Flare (Flow and Total Sulfur), FCU WGS (SOz, NOx, CO and Oz), FCU CO Boiler Bypass Stack (SOz,
NOx, CO, and Oz) V-917 Fuel Gas Balance Drum (HzS), East and West Cogeneration Turbine and HRSG
trains (shared HzS) required by NSPS Subpart Ja are reported per $60.7(c) with the State Electronic Data
Reports. These reports also address all CEMS QA/QC practices, including initial certification testing (i.e.
7-day drift test and initial Relative Accuracy Test Audits) and on-going Cylinder Gas Audits (CGAs) and
RATAs. Tesoro submitted reports for 2nd Quarter 2024 and 3rd Quarter 2024. QNQC downtime for the
CPMS for purposes of NSPS Subpart Ja at the FCU Regenerator/CO Boiler/ESP/WGS, including Total
Power, Secondary Current, WGS Differential Pressure, WGS L/G Ratio and Total Coke-Burn are
included in this report.
Certifi cation Statement:
I certifu that this information was prepared under my direction or supervision in accordance with a system
designed to assure that qualified personnel properly gather and evaluate the information submitted. Based
on my directions and my inquiry of the person(s) who manage the system, or the person(s) directly
responsible for gathering the information, the information submitted is, to the best of my knowledge and
belief, true, accurate, and complete.
Please call Chris Kaiser at [phone] if you have any questions.
Sincerely. t()*o,r/
Dean P. Anderson
Vice President
Tesoro Refining & Marketing Company LLC
Attachments
cc: USEPA Region VIII
SUBMITTED VIe CouRIeR
Subpart Ja Summary Report ((10 CFR 60.7(c), 10 CFR 60.108a(d)(1-7))
tll Signed statement, if applicable, is included on the verification sheet.
Unit: North Refinery Flare
(Served by Shared
Flare Gas Recovery
with South Flare)
Parameter: Hydrogen Sulfide
(HrS)
Reporting Period: April l, 2024 -
September 30,2024
Work Practice 162 ppmvd H:S,3-hour
Standard: rolling average
Periods of Deviation from Work Practice
Standardlrl:
See submitted State Electronic Data2nd
Quarter 2024 and 3rd Quarter 2024
Periods for which HzS monitoring data are not
availabletrl:
See submitted State Electronic Data Reports
2nd Quarter 2024 and 3rd Quarter 2024
Subpart Ja Summary Report ((40 CFR 60.7(c), 40 CFR 60.108a(d)(1-7))
tll Signed statement, if applicable, is included on the verification sheet.
Unit: South Refinery Flare
(Served by Shared
Flare Gas Recovery
with North Flare)
Parameter: HzS
Reporting Period trl: April l, 2024 -
September 30,2024
Work Practice 162 ppmvd HzS,3-hourStandard: rolling average
Periods of Deviation from Work Practice
Standardtrl:
See submitted State Electronic Data Reports
2nd Quarter 2024 and 3rd Quarter 2024
Periods for which HzS monitoring data are not
availabletrl:
See submitted State Electronic Data Reports
2nd Quarter 2024 and 3rd Quarter 2024
Subpart Ja Summary Report ((40 CFR 60.7(c), 10 CFR 60.108a(d)(l-7))
Unit: North and South
Refinery Flares (Served
by Shared Flare Gas
Recoverv)
Parameter: Sulfur Dioxide (SOz)
Reporting Period: April 1, 2024 -
September 30,2024
Work Practice 500 lb SOz/24-hour
Standards: period, or 500,000 scf
flared above baseline
flare flow ttll24-hour
period.
Each standard applies
as sum from both
flares.
Periods of Deviation from Work Practice
Standards tl'21:
Events identified below (SO2 and/or flare
flow)[3]:
None during reporting period.
Periods for which Total Sulfur (TS) and flare
flow monitoring data are not available t2l:
See submitted State Electronic Data Reports
2nd Quarter 2024 and 3rd Quarter 2024
tll ln accordance with 40 CFR 60.103a(c)( 1)(ii), the work practice standard is set at 500,000 scf
in excess of the baseline flow reported in the NSPS Ja Flare Management Plan. The baseline
flow to the north and south flares is 0 scf/hr during normal operations. Therefore, the work
practice standard is set at 500,000 scf per 24-hour period during normal operations. Four
alternative baseline scenarios are identified in the NSPS Ja Flare Management Plan and the
work practice standard is set at 500,000 scf above the applicable alternative baseline per 24-
hour period only during the applicable scenario.
Signed statement, if applicable, is included on the verification sheet.
Time period indicate entire period 24-hour average remained over threshold.
t2l
t3l
lll:
12)
Subpart Ja Summary Report ((40 CFR 60.7(c), 40 CFR 60.108a(d)(1-7))
In accordance with 40 CFR 60.107a(a)(2Xv), a total sulfur monitor is used in lieu of a
hydrogen sulfide monitor.
Signed statement, if applicable, is included on the verification sheet.
Unit: SRU Flare (no Flare
Cas Recovery)
Parameter: HzS
Reporting Period: April l, 2024 -
September 30,2024
Work Practice 162 ppmvd TS as HzS,Standardtrl: 3-hour rolling average
Periods of Deviation from Work Practice
Standardttl:
See submitted State Electronic Data Reports
2nd Quarter 2024 and 3rd Quarter 2024
Periods for which TStrl monitoring data are not
availablet2l:
See submitted State Electronic Data Reports
2nd Quarter 2024 and 3rd Quarter 2024
lll:
[2]:
Subpart Ja Summary Report ((10 CFR 60.7(c), 40 CFR 60.108a(d)(l-7))
In accordance with 40 CFR 60.103a(c)( I )(ii), the work practice standard is set at 500,000 scf
in excess of the baseline flow reported in the NSPS Ja Flare Management Plan. The baseline
flow to the SRU Flare is 28,800 scf/hr. Therefore, the work practice standard is set at
528,800 scfper 24-hour period.
Signed statement, if applicable, is included on the verification sheet.
Unit: SRU Flare (no Flare
Gas Recovery)
Parameter: SOz
Reporting Period: April l, 2024 -
September 30,2024
Work Practice 500 lb SOz/24-hour
Standard: period, or 500,000 scf
flared above baseline
flare flowtr1/24-hour
period.
Periods of Deviation from Work Practice
Standardst2l:
Event identified below (SO2 and/or flare flow):
None during reporting period.
Periods for which TS and flare flow monitoring
data are not availablet2l:
See submitted State Electronic Data Repofts
2nd Quarter 2024 and 3rd Quarter 2024
Unit: Y-917 Refinery Fuel
Gas Balance Drum
Parameter: HrS
Reporting Period: April l, 2024 -
September 30,2024
Emissions Limit: 162 ppmvd HzS,
3-hour Rolling Average
Periods of Excess Emissions[1 See submitted State Electronic Data Reports
2nd Quarter 2024 and 3rd Quarter 2024
Periods for which HzS monitoring data are not
availabletri:
See submitted State Electronic Data Reports
2nd Quarter 2024 and 3rd Quarter 2024
Reporting Period: April l, 2024 -
September 30,2024
Emissions Limit: 60 ppmvd HzS,
365-day Rolling
Average
Periods of Excess Emissionstrl No excess emissions during the reporting period
For each Excess Emissions event:
Explanation of the Exceedance:
No excess emissions during the reporting period
Whether the exceedance was concurrent
with a startup, shutdown, or malfunction of
an affected facility or control system:
No excess emissions during the reporting period
A description of the action taken, if any:No excess emissions during the reporting period
Periods for which H:S monitoring data are not
rvailabletrl:
See submitted State Electronic Data Reports
2nd Quarter 2024 and 3rd Quarter 2024
[]: Signed statement, if applicable, is included on the verification sheet.
Unit: East Cogen & West
Cogen Turbines
Parameter: HrS
Reporting Period: April 1, 2024 -
September 30,2024
Emissions Limit: 162 ppmvd H:S,
3-hour Rolling
Average
Periods of Excess Emissionstrl See submitted State Electronic Data Reports
2nd Quarter 2024 and 3rd Quarter 2024
Periods for which H:S monitoring data are nol
availabletrl:
See submitted State Electronic Data Reports
2nd Quarter 2024 and 3rd Quarter 2024
Reporting Period: April l, 2024 -
September 30,2024
EmissionsLimit: t:fil"fi5iilgou.,u*.
Periods of Excess Em issionsl I 1 No excess emissions during the reporting period
For each Excess Emissions event:
Explanation of the Exceedance:
No excess emissions during the reporting period
Whether the exceedance was concurrent
with a startup, shutdown, or malfunction of
an affected facility or control system:
No excess emissions during the reporting period
A description of the action taken, if any:No excess emissions during the reporting period
Signed statement, if applicable, is included on the verification sheet.
UNit: FCU _ WGS Parameter: CO
Reporting Period: April l, 2024 -
September 30,2024
Emissions Limit: 500 ppmvd CO,
corrected to |Yo Oz,
l-hr Block Aueraee
Periods of Deviation from Emissions Limit See submitted State Electronic Data Reports
Znd Quarter 2024 and 3rd Quarter 2024
Periods for which CO monitoring data are not
availabletrl:
See submitted State Electronic Data Reports
Znd Quarter 2024 and 3rd Quarter 2024
[]: Signed statement, if applicable, is included on the verification sheet.
Unit: FCU - ESP Parameter: Total Power
Reponing Period: April l, 2024 -
September 30,2024
Operating Limitslrl: 0 kW
All limits as 3-hour
rollins cNerase
I ) Duration of Excess Emissions in reporting period
lue to:
l) CMS downtime in reporting period due to:
a) Startup/ 0 hr
shutdown
a) Monitor equipment 0.0 hr
malfunctions
b) Controlequipment
oroblems
hr0 b) Non-Monitor equipment 0.0 hr
malfunctions
hrc)Process Problems hr0.0c) Qualiry assurance
calibration
d) Other known causes 0 hr d) Other known causes 0.0 hr
e) Unknown causes 0 hr e) Unknown causes 0.0 hr
2) Total duration ofexcess 0 hr
emissions:
2) TotalCPMS downtime: 0.0 hr
3) Total Operatins Hoursl rl 4392 hr 3 ) Total Operatine Hourslrl 4.392 hr
1) Excess Emissions, as 0.0 %
lercentage of operating time
,o/o\
4) CPMS downtime, as 0.00 %
percentage of operating time (%)
For each Excess Emissions event:
Date ofthe Exceedance:No exceedances during reporting period
Explanation of the Exceedance:
Whether the exceedance was concurrent with a
startup, shutdown, or malfunction of an affected
facility or control system:
A description of the action taken, if any:
For any periods for which monitoring data are not
available, any changes made in operation of the
emission control system during the period of data
unavailability which could affect the abiliry of the
system to meet the applicable emission limit.
Minimum allowable Total Power was zero so no
concern with meeting emission limit.
[1]:$60.102a(c)( I )(i) requires for FCUs controlled by an
average total power and secondary current above the
performance test.
ESP to maintain the 3-hour rolling
level established during the most recent
Unit: FCU _ ESP Parameter: Secondarv Current
Reporting Period: April l, 2024 -
September 30,2024
Cperating Limitstr): 0 Amps
4ll limits as 3-hour
,ollino averase
I ) Duration of Excess Emissions in reporting period
lue to:
l) CMS downtime in reporting period due to:
a) Startup/shutdown 0 hr a) Monitor equipment 0.0 hr
malfunctions
b) Controlequipment 0 hr
problems:
b) Non-Monitorequipment
malfunctions
0.0 hr
c) Process Problems 0 hr c) Quality assurance 0.0 hr
calibration
d) Other known causes 0 hr d) Other known causes 0.0 hr
e) Unknown causes 0 hr e) Unknown causes 0.0 hr
2) Total duration ofexcess 0 hr
emissions:
2) Total CPMS downtime: 0.0 hr
3) Total Ooeratine Hoursl rl 4.392 hr 3) Total Ooeratins Hourslrl 4392 hr
{) Excess Emissions, as 0.0 %
rercentage of operating time (%)
1) CPMS downtime, as 0.00 %
lercentage of operating time
'vo\
For each Excess Emissions event:
Date ofthe Exceedance:No exceedances during reporting period
Explanation of the Exceedance:
Whether the exceedance was concurrent with a
startup, shutdown, or malfunction of an affected
faciliW or control system:
A description of the action taken, if any:
For any periods for which monitoring data are not
available, any changes made in operation of the
emission control system during the period of data
unavailability which could affect the ability of the
svstem to meet the aoplicable emission limit.
Minimum allowable Secondary Current was zero so no
concern with meeting emission limit.
[]: $60.102a(c)(l)(i) requires for FCUs controlled by an ESP to maintain the 3-hour rolling
average total power and secondary current above the level established during the most recent
performance test.
Unit: FCU Regenerator Parameter: Coke-Burn
Reporting Period: April l, 2024 -
September 30,2024
operating Limitstrl: 20,671 lblhr
4ll limits as daily
lVerage
l) Duration of Excess Emissions in reporting
oeriod due to:
1) CMS downtime in reporting period due to:
a) Startup/ 0 hr
shutdown
a) Monitor
equipment
malfunctions
hr0.0
b) Control equipment 0 hr
problems:
b) Non-Monitor
equipment
malfunctions
hr0.0
c) Process Problems 0 hr c) Quality assurance 0.0 hr
calibration
d) Other known 0 hr
causes
d) Other known
causes
hr0.0
e) Unknown causes 0 hr e) Unknown causes 0.0 hr
2) Total duration of 0 hr
excess emissions:
2) TotalCPMS 0.0 hr
downtime:
3) Total Operating 4,392 hr
Hourstll
3) Total Operating 4,392 hr
Hourstll
4) Excess Emissions, as 0.0 %
percentage of operating
time (%)
4) CMS downtime, as 0.00 %
percentage of operating
time (%)
For each Excess Emissions event:
Date of the Exceedance:No exceedances during reporting period
Explanation of the Exceedance:
Whether the exceedance was concurrent
with a startup, shutdown, or malfunction of
an affected faciliw or control svstem:
A description of the action taken, if any:
For any periods for which monitoring data are
not available, any changes made in operation of
the emission control system during the period of
data unavailability which could affect the ability
of the system to meet the applicable emission
limit.
No downtime during reporting period
[]: $60.102a(c)(lXii) requires the daily average exhaust coke burn-off rate not exceed the level
established during the most recent performance test.
Jnit: wGS Parameter: Differential Pressure
Reporting Period: April I ,2024 -
September 30,2024
Operating Limitstrl 4.4 in HzO
4ll limits as 3-hour
,ollins averaae
l) Duration of Excess Emissions in reporting
reriod due to:
I ) CMS downtime in reporting period due to:
a) Startup/
shutdown
hr0 a) Monitor equipment 0.0 hr
malfunctions
b) Control equipment 0 hr
oroblems
b) Non-Monitor equipment 0.0 hr
malfunctions
c) Process Problems 0 hr c) Quality assurance 0.0 hr
calibration
d) Other known causes 7 hr d) Other known causes 0.0 hr
e) Unknown causes 0 hr e) Unknown causes 0.0 hr
2) Totalduration of excess 7 hr
:missions:
2) Total CPMS downtime: 0.0 hr
l) Total Operatins Hourstrl 4,392hr 3) Total Operatins Hourstrl 4,392hr
1) Excess Emissions, as 0.2 %
lercentage of operating time,%\
4) CPMS downtime, as 0.00 %
percentage of operating time
(%\
lor each Excess Emissions event:
Date ofthe Exceedance:Date: 4130-5 I I 12024 (interm ittent blocks)
On multiple days including 4130-51112024,
Tesoro conducted its annual source test to
establish new operating parameters. The Wet
Gas Scrubber was operated at multiple operating
conditions to demonstrate compliance.
Reference Method particulate testing conducted
on these dates demonstrate the unit's particulate
emissions were less than the 1.0 lb. PM/1,000 lb.
of coke burn emission limit.
The exceedance did not occur during a startup,
shutdown, or malfunction.
After the annual source test was completed, Wet
Gas Scrubber parameters were returned to the
nreviouslv establ ished setno ints.
Explanation of the Exceedance:
Whether the exceedance was concurrent with
a startup, shutdown, or malfunction of an
affected facility or control system:
A description of the action taken, if any:
For any periods for which monitoring data are
not available, any changes made in operation of
the emission control system during the period of
Cata unavailability which could affect the ability
cf the system to meet the applicable emission
limit.
No downtime during reporting period
[ ]: Operating limits for DP were established during performance testing. Operating limits determined by
this testing are included in this Semiannual Report, and these limits are effective upon submittal of the
report to UDAQ.
Unit: wGS Parameter: L/G Ratio
Reporting Period: April l, 2024 -
September 30,2024
CperatingLimitstrl 65.3 galll\4scf
4ll limits as 3-hour
nollins overase
l) Duration of Excess Emissions in reporting
period due to:
l) CMS downtime in reporting period due to:
a) Startup/ 0 hr
shutdown
l) Monitor equipment 0.0 hr
malfunctions
b) Controlequipment 0 hr
nrohlems
b) Non-Monitor equipment 0.0 hr
malfunctions
c) Process Problems 0 hr :) Quality assurance 0.0 hr
:alibration
d) Other known causes 0 hr 1) Other known causes 0.0 hr
e) Unknown causes t hr :) Unknown causes 0.0 hr
2) Total duration ofexcess 0 hr
emissions:
2) TotalCPMS downtime: 0.0 hr
3)TotalOperatineHourstrl 4.392hr 3) Total Operating Hourstll 4.392 hr
4) Excess Emissions, as 0.2 %
percentage of operating time
(%\
4) CPMS downtime, as 0.00 %
percentage of operating time
(%\
For each Excess Emissions event:
Date ofthe Exceedance:Date: 4 130 -5 I I 12024 (interm ittent blocks)
On multiple days including 4130-51112024,
Tesoro conducted its annual source test to
establish new operating parameters. The Wet
Gas Scrubber was operated at multiple operating
conditions to demonstrate compliance.
Reference Method particulate testing conducted
on these dates demonstrate the unit's particutate
emissions were less than the 1.0 lb. PM/1,000 lb.
of coke burn emission limit.
The exceedance did not occur during a startup,
shutdown, or malfunction.
After the annual source test was completed, Wet
Gas Scrubber parameters were returned to the
previouslv established setpoints.
Explanation of the Exceedance:
Whether the exceedance was concurrent with
a startup, shutdown, or malfunction of an
affected facility or control system:
A description of the action taken, if any:
For any periods for which monitoring data are
rot available, any changes made in operation of
:he emission control system during the period of
lata unavailability which could affect the ability
rf the system to meet the applicable emission
Limit.
No downtime during reporting period
[]: Operating limits for DP were established during performance testing. Operating limits determined by
this testing are included in this Semiannual Report, and these limits are effective upon submittal of the
UTAH DFPAR]MENT
EI.JVI RONMENTAL QUALITY
DIVISION OF AIR OUALITY
report to UDAQ.