DAQ-2024-007017

RioTinto
March18,2024
Rio Tinto Kennecott Utah Coppei LLC
4700 Daybreak Parkway
South Jordan, Utah 84009
Mr. Bryce Bird - Director
Department of Environmental Quality
Division of Air Quality
P.O. Box 144820
Salt Lake City, Utah 8/.114-4820
TTTAH DEPARTMENT OF
ENVIRONMENTAL OUALITY
l,illi /'ti
$an /
DiVISION
Dalt /Lr<4
OF AIR QUALIN,,
Attn: Joe Randolph
Dear Mr. Bird
RE: Smelter Monthlv Report - Februarv 2024
Rio Tinto Kennecott Utah Copper LLC (KUC) is submitting this letter in
compliance with Approval Order (AO) number DAQE-ANO103460062-23
and Title V Operating Permit (Title V) Number 3500030004. lncluded
herein is the monthly KUC Smelter monthly report for February 2024.
The following sections present data related to the Holman Boiler, Main
Stack particulate and lead emissions, and Main Stack gas flow.
Holman Boiler
The Holman Boiler 30-day average NOx emissions are measured as
outlined in the most recently approved monitoring plan in accordance with
AO condition ll.B.2.b and Title V condition 11.8.23.b.1. The information
provided in Table 1 is required to be reported monthly.
Table 1: Holman Boiler Data
Were the 30-day average NOx emissions greater than 9.34
lbs/hr durino the oeriod?N/A
Were the 30-day average 02 levels greater than 3.3% during
the period?N/A**
Were the Holman Boiler data recovery requirements met during
the period? -N/A*
Rio Tinto Kentrmtt Uiah Copptr, LLC. 4700 Oaybr€ak Parkway, South Jordan, Utah 84009.
REVIEWED
Initials JBR Date 3/25/24
Comp Status Meets
File # 10346 Blue 2
no exceedances
RioTinto Rio Tinto Kennecoft Utah Copper, LLC
4700 Daybreak Parkway
South Jordan. Utah 84009
Main Stack Particulate Matter (PMl0) and Lead (Pb) Emissions
Notes:
* For compliance with data recovery requirements, a minimum of 75% of the
operating hours in each operating day must be achieved in at least 22 of 30
successive operating days.
** The Holman burner replacement is complete. KUC has completed stack
testing but is still reviewing the report to determine a new orygen limit for the
new burner svstem.
able 2: Main StacK Particulate ancl Lead Emissions
Date Main Stack Particulate
(lbs/h0
Main Stack Lead
(lbs/hr)
2t1t2024 t7,1 o.4
2t2t2024 zz.8 o.5
2t3t2024 27.2 o.7
214t2024 55.O o,7
2t5t2024 2q.5 1.O
2t6t2024 22.d o.8
2nt2024 t8.z o.8
2t8t2024 15.O o.g
2t9t2024 *o.7*
2t10t2024 o.f
2t11t2024 29.o o.6
2t12t2024 11.q o.7
2t13t2024 13.3 o.3
2t14t2024 15.q o.6
2t15t2024 L2.7 1.1
2t16t2024 rr.8 o.q
2t17t2024 z6.z o.6
2t18t2024 r8..s 1.1
2t19t2024 *o.z*
2t20t2024 *o.f
2t21t2024 *o.z*
2t22t2024 *o.zx
2t23t2024 27.1 o.5
2124t2024 gz.6 1.O
2t25t2024 21.7 o.5
2t2612024 42.2 o.g
212712024 21.?o.3
Rio Tinto K€nnecott Utah Copper, LLC. 4700 Daybreak Parloay, South Jordan, Utah 84009
RioTinto Rio Tinto Kennecott Utah Copper, LLC
4700 Oaybreak Parkway
South Jordan, Utah &4009
Particulate and lead emissions are measured and calculated in
accordance with the most recently approved monitoring plan. Table 2
summarizes the daily particulate and lead emissions data. The daily main
stack particulate emissions are to be compared with the permit limit of
89.5 lbs/hr as set forth in AO condition ll.B.1.a (H) and Title V condition
ll.B.24.a (i).
Table 3 summarizes the Main Stack particulate and lead emissions
annual data calculations. This includes recovery percentages for
particulate and lead emissions samples and the annualaverage lead
emissions. The lead annual average emissions are to be compared with
the permit limit of 1.3 lbs/hr as set forth in AO condition ll.B.1.a (H) and
Title V condition 11.8.24.d.
Main Stack Gas Flow
ln accordance with AO condition 11.B.3.a.6, main stack gas flow may be
estimated in the event that temperature and velocity measurements
malfunction. Table 4 summarizes the instances when main stack gas flow
was estimated.
Table 4: Main Stack Gas Flow Estimates
Number of instances when main stack gas
flow was estimated during the period:Zero (0)
2t28t2024 35.1 o.6
2t29t2024 *o.z*
\otes: Seven samples were invalidated for particulate and lead emissions for the
nonth: February 9t, 10t, and 29h were invalidated due to procedural enors (per
rcction 6.6.3 of the Monitoring Plan). February 19h, 20rh, 21.t, and 22nd were
nvalidated due to maintenance work on the stack elevator. The monthly average
ralue for lead is substituted on these days for calculating the annual averErge per
:he plan.
able 3: Main Stack Annual
Particulate Emissions Data Recovery*85.4o/o
Lead Emissions (Annual Average)0.3 lbs/hr
Lead Emissions Data Recovery*84.8o/o
Notes:
+ - Data recovery percentages are to be compared with the 80% data recovery
reouirement outlined in the most recentlv aooroved monitorino olan.
Rio Tinto Ksnnecott Utah Coppsr, LLC. 4700 Daybrsak Parhxay, South Jtrda, Utah 84009.
RlOTlntO RiorintoKenneconur.hcoppor,LLc
4700 Daybreak Pad<way
South Jodan, t tah E4009
Based on information and belief formed after reasonable inquiry, the
statements and information in this document are true, accurate, and
complete (R30741Ssd).
lf you have any questions regarding this report, please contact me or Sean
Daly at 801-20+2563.
Yours sincerely,
Jerome Dozol
General Manager - Metals
RbTinto Kqnrrcd Ut h @pper, LLC..m0 DafDGak Parlo,ey, South.ffii, t teh 84009.