May 15, 2014 

Redline of 40 CFR part 63, subpart UUU, showing proposed amendments 

Insertions are shown in bold blue text 

Deletions are shown in red strikeout text 

Title 40: Protection of Environment 

PART 63—NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS 

FOR SOURCE CATEGORIES 

Subpart UUU—National Emission Standards for Hazardous Air Pollutants for Petroleum 

Refineries: Catalytic Cracking Units, Catalytic Reforming Units, and Sulfur Recovery 

Units 

What This Subpart Covers 

§63.1560 What is the purpose of this subpart? 

This subpart establishes national emission standards for hazardous air pollutants (HAP) emitted 

from petroleum refineries. This subpart also establishes requirements to demonstrate initial and 

continuous compliance with the emission limitations and work practice standards. 

§63.1561 Am I subject to this subpart? 

(a) You are subject to this subpart if you own or operate a petroleum refinery that is located at a 

major source of HAP emissions. 

(1) A petroleum refinery is an establishment engaged primarily in petroleum refining as defined 

in the Standard Industrial Classification (SIC) code 2911 and the North American Industry 

Classification (NAIC) code 32411, and used mainly for: 

(i) Producing transportation fuels (such as gasoline, diesel fuels, and jet fuels), heating fuels 

(such as kerosene, fuel gas distillate, and fuel oils), or lubricants; 

(ii) Separating petroleum; or 

(iii) Separating, cracking, reacting, or reforming an intermediate petroleum stream, or recovering 

a by-product(s) from the intermediate petroleum stream (e.g., sulfur recovery). 

(2) A major source of HAP is a plant site that emits or has the potential to emit any single HAP 

at a rate of 9.07 megagrams (10 tons) or more per year or any combination of HAP at a rate of 

22.68 megagrams (25 tons) or more per year. 
2 

(b) [Reserved] 

§63.1562 What parts of my plant are covered by this subpart? 

(a) This subpart applies to each new, reconstructed, or existing affected source at a petroleum 

refinery. 

(b) The affected sources are: 

(1) The process vent or group of process vents on fluidized catalytic cracking units that are 

associated with regeneration of the catalyst used in the unit (i.e., the catalyst regeneration flue 

gas vent). 

(2) The process vent or group of process vents on catalytic reforming units (including but not 

limited to semi-regenerative, cyclic, or continuous processes) that are associated with 

regeneration of the catalyst used in the unit. This affected source includes vents that are used 

during the unit depressurization, purging, coke burn, and catalyst rejuvenation. 

(3) The process vent or group of process vents on Claus or other types of sulfur recovery plant 

units or the tail gas treatment units serving sulfur recovery plants, that are associated with sulfur 

recovery. 

(4) Each bypass line serving a new, existing, or reconstructed catalytic cracking unit, catalytic 

reforming unit, or sulfur recovery unit. This means each vent system that contains a bypass line 

(e.g., ductwork) that could divert an affected vent stream away from a control device used to 

comply with the requirements of this subpart. 

(c) An affected source is a new affected source if you commence construction of the affected 

source after September 11, 1998, and you meet the applicability criteria in §63.1561 at the time 

you commenced construction. 

(d) Any affected source is reconstructed if you meet the criteria in §63.2. 

(e) An affected source is existing if it is not new or reconstructed. 

(f) This subpart does not apply to: 

(1) A thermal catalytic cracking unit. 

(2) A sulfur recovery unit that does not recover elemental sulfur or where the modified reaction 

is carried out in a water solution which contains a metal ion capable of oxidizing the sulfide ion 

to sulfur (e.g., the LO-CAT II process). 

(3) A redundant sulfur recovery unit not located at a petroleum refinery and used by the refinery 

only for emergency or maintenance backup. 
3 

(4) Equipment associated with bypass lines such as low leg drains, high point bleed, analyzer 

vents, open-ended valves or lines, or pressure relief valves needed for safety reasons. 

(5) Gaseous streams routed to a fuel gas system, provided that on and after [THE DATE 3 

YEARS AFTER THE DATE OF PUBLICATION OF THE FINAL RULE 

AMENDMENTS IN THE FEDERAL REGISTER], any flares receiving gas from the fuel 

gas system are in compliance with §63.670. 

§63.1563 When do I have to comply with this subpart? 

(a) If you have a new or reconstructed affected source, you must comply with this subpart 

according to the requirements in paragraphs (a)(1) and (2) of this section. 

(1) If you startup your affected source before April 11, 2002, then you must comply with the 

emission limitations and work practice standards for new and reconstructed sources in this 

subpart no later than April 11, 2002. 

(2) If you startup your affected source after April 11, 2002, you must comply with the emission 

limitations and work practice standards for new and reconstructed sources in this subpart upon 

startup of your affected source. 

(b) If you have an existing affected source, you must comply with the emission limitations and 

work practice standards for existing affected sources in this subpart by no later than April 11, 

2005 except as specified in paragraph (c) of this section. 

(c) We will grant an extension of compliance for an existing catalytic cracking unit allowing 

additional time to meet the emission limitations and work practice standards for catalytic 

cracking units in §§63.1564 and 63.1565 if you commit to hydrotreating the catalytic cracking 

unit feedstock and to meeting the emission limitations of this subpart on the same date that your 

facility meets the final Tier 2 gasoline sulfur control standard (40 CFR part 80, subpart J). To 

obtain an extension, you must submit a written notification to your permitting authority 

according to the requirements in §63.1574(e). Your notification must include the information in 

paragraphs (c)(1) and (2) of this section. 

(1) Identification of the affected source with a brief description of the controls to be installed (if 

needed) to comply with the emission limitations for catalytic cracking units in this subpart. 

(2) A compliance schedule, including the information in paragraphs (c)(2)(i) through (iv) of this 

section. 

(i) The date by which onsite construction or the process change is to be initiated. 

(ii) The date by which onsite construction or the process change is to be completed. 

(iii) The date by which your facility will achieve final compliance with both the final Tier 2 

gasoline sulfur control standard as specified in §80.195, and the emission limitations and work 
4 

practice standards for catalytic cracking units in this subpart. In no case will your permitting 

authority grant an extension beyond the date you are required to meet the Tier 2 gasoline sulfur 

control standard or December 31, 2009, whichever comes first. If you don't comply with the 

emission limitations and work practice standards for existing catalytic cracking units by the 

specified date, you will be out-of-compliance with the requirements for catalytic cracking units 

beginning April 11, 2005. 

(iv) A brief description of interim emission control measures that will be taken to ensure proper 

operation and maintenance of the process equipment during the period of the compliance 

extension. 

(d) If you have an area source that increases its emissions or its potential to emit such that it 

becomes a major source of HAP, the requirements in paragraphs (d)(1) and (2) of this section 

apply. 

(1) Any portion of the existing facility that is a new affected source or a new reconstructed 

source must be in compliance with the requirements of this subpart upon startup. 

(2) All other parts of the source must be in compliance with the requirements of this subpart by 

no later than 3 years after it becomes a major source or, if applicable, the extended compliance 

date granted according to the requirements in paragraph (c) of this section. 

(e) You must meet the notification requirements in §63.1574 according to the schedule in 

§63.1574 and in 40 CFR part 63, subpart A. Some of the notifications must be submitted before 

the date you are required to comply with the emission limitations and work practice standards in 

this subpart. 

Catalytic Cracking Units, Catalytic Reforming Units, Sulfur Recovery Units, and Bypass 

Lines 

§63.1564 What are my requirements for metal HAP emissions from catalytic cracking 

units? 

(a) What emission limitations and work practice standards must I meet? You must: 

(1) Meet each emission limitation in Table 1 of this subpart that applies to you. If your catalytic 

cracking unit is subject to the NSPS for PM in §60.102 or is subject to §60.102a(b)(1) of this 

chapter, you must meet the emission limitations for NSPS units. If your catalytic cracking unit 

isn'tis not subject to the NSPS for PM, you can choose from the four options in paragraphs 

(a)(1)(i) through (iv) of this section: 

(i) You can elect to comply with the NSPS requirementsPM per coke burn-off emission limit

(Option 1); 

(ii) You can elect to comply with the PM concentration emission limit (Option 2); 
5 

(iii) You can elect to comply with the Nickel (Ni) lb/hr emission limit (Option 3); or 

(iv) You can elect to comply with the Ni lb/1,000 lbs ofper coke burn-off emission limit (Option 

4). 

(2) Comply with each operating limit in Table 2 of this subpart that applies to you. 

(3) Prepare an operation, maintenance, and monitoring plan according to the requirements in 

§63.1574(f) and operate at all times according to the procedures in the plan. 

(4) The emission limitations and operating limits for metal HAP emissions from catalytic 

cracking units required in paragraphs (a)(1) and (2) of this section do not apply during periods of 

planned maintenance preapproved by the applicable permitting authority according to the 

requirements in §63.1575(j). 

(5) During periods of startup only, if your catalytic cracking unit is followed by an 

electrostatic precipitator, you can choose from the two options in paragraphs (a)(5)(i) and 

(ii) of this section: 

(i) You can elect to comply with the requirements paragraphs (a)(1) and (2) of this section; 

or 

(ii) You can elect to maintain the opacity in the exhaust gas from your catalyst regenerator 

at or below 30 percent opacity on a 6-minute average basis. 

(b) How do I demonstrate initial compliance with the emission limitations and work practice 

standard? You must: 

(1) Install, operate, and maintain a continuous monitoring system(s) according to the 

requirements in §63.1572 and Table 3 of this subpart. 

(2) Conduct a performance test for each catalytic cracking unit not subject to the NSPS for PM 

according to the requirements in §63.1571 and under the conditions specified in Table 4 of this 

subpart. 

(3) Establish each site-specific operating limit in Table 2 of this subpart that applies to you 

according to the procedures in Table 4 of this subpart. 

(4) Use the procedures in paragraphs (b)(4)(i) through (iv) of this section to determine initial 

compliance with the emission limitations. 

(i) If you elect Option 1 in paragraph (a)(1)(i) of this section, the NSPS requirements, compute 

the PM emission rate (lb/1,000 lbs of coke burn-off) for each run using Equations 1, 2, and 3 (if 

applicable) of this section and the site-specific opacity limit, if applicable, using Equation 4

of this section as follows: 

    c r a r %CO %O K Qoxy %Oxy

%CO R K1Q %CO2 %CO K2Q K3Q 2 2 3 2





 



    

 



     (Eq. 1) 
6 

Where: 

Rc = Coke burn-off rate, kg/hr (lb/hr); 

Qr = Volumetric flow rate of exhaust gas from catalyst regenerator before adding air or gas 

streams. Example: You may measure upstream or downstream of an electrostatic precipitator, 

but you must measure upstream of a carbon monoxide boiler, dscm/min (dscf/min). You may use 

the alternative in either §63.1573(a)(1) or (a)(2), as applicable, to calculate Qr; 

Qa = Volumetric flow rate of air to catalytic cracking unit catalyst regenerator, as determined 

from instruments in the catalytic cracking unit control room, dscm/min (dscf/min); 

%CO2 = Carbon dioxide concentration in regenerator exhaust, percent by volume (dry basis); 

%CO = Carbon monoxide concentration in regenerator exhaust, percent by volume (dry basis); 

%O2 = Oxygen concentration in regenerator exhaust, percent by volume (dry basis); 

K1 = Material balance and conversion factor, 0.2982 (kg-min)/(hr-dscm-%) (0.0186 (lb-min)/(hrdscf-%)); 

K2 = Material balance and conversion factor, 2.088 (kg-min)/(hr-dscm) (0.1303 (lb-min)/(hrdscf)); 

K3 = Material balance and conversion factor, 0.0994 (kg-min)/(hr-dscm-%) (0.0062 (lb-min)/(hrdscf-%)); 

Qoxy = Volumetric flow rate of oxygen-enriched air stream to regenerator, as determined from 

instruments in the catalytic cracking unit control room, dscm/min (dscf/min); and 

%Oxy = Oxygen concentration in oxygen-enriched air stream, percent by volume (dry basis). 

c

s sd

R

K C Q E   (Eq. 2) 

Where: 

E = Emission rate of PM, kg/1,000 kg (lb/1,000 lb) of coke burn-off; 

Cs = Concentration of PM, g/dscm (lb/dscf); 

Qsd = Volumetric flow rate of the catalytic cracking unit catalyst regenerator flue gas as 

measured by Method 2 in appendix A to part 60 of this chapter, dscm/hr (dscf/hr); 

Rc = Coke burn-off rate, kg coke/hr (1,000 lb coke/hr); and 

K = Conversion factor, 1.0 (kg2

 /g)/(1,000 kg) (1,000 lb/(1,000 lb)). 
7 

1.0 K' R

H E A

c

s 













   (Eq. 3) 

Where: 

Es = Emission rate of PM allowed, kg/1,000 kg (1b/1,000 lb) of coke burn-off in catalyst 

regenerator; 

1.0 = Emission limitation, kg coke/1,000 kg (lb coke/1,000 lb); 

A = Allowable incremental rate of PM emissions. Before [THE DATE 18 MONTHS AFTER 

THE DATE OF PUBLICATION OF THE FINAL RULE AMENDMENTS IN THE 

FEDERAL REGISTER], A=0.18 g/million cal (0.10 lb/million Btu). On or after [THE 

DATE 18 MONTHS AFTER THE DATE OF PUBLICATION OF THE FINAL RULE 

AMENDMENTS IN THE FEDERAL REGISTER], A=0 g/million cal (0 lb/million Btu);

and

H = Heat input rate from solid or liquid fossil fuel, million cal/hr (million Btu/hr). Make sure 

your permitting authority approves procedures for determining the heat input rate.;

Rc = Coke burn-off rate, kg coke/hr (1,000 lb coke/hr) determined using Equation 1 of this 

section; and 

K’ = Conversion factor to units to standard, 1.0 (kg2/g)/(1,000 kg) (103 lb/(1,000 lb)). 

(ii) If you elect Option 2 in paragraph (a)(1)(ii) of this section, the PM emission limit, compute 

your PM emission rate (lb/1,000 lbs of coke burn-off) using Equations 1 and 2 of this section and 

your site-specific opacity operating limit (if you use a continuous opacity monitoring system) 

using Equation 4 of this section as follows: 















  

st

st PMEmR Opacity Limit Opacity 1lb/klb coke burn















  

st

st PMEmR Opacity Limit Opacity 1lb / 1000 lb coke burn (Eq. 4) 

Where: 

Opacity lLimit = Maximum permissible hourly average opacity, percent, or 10 percent, 

whichever is greater; 

Opacityst = Hourly average opacity measured during the source test runs, percent; and 

PMEmRst = PM emission rate measured during the source test, lb/1,000 lbs coke burn. 
8 

(ii) If you elect Option 2 in paragraph (a)(1)(ii) of this section, the PM concentration 

emission limit, determine the average PM concentration from the initial performance test 

used to certify your PM CEMS. 

(iii) If you elect Option 3 in paragraph (a)(1)(iii) of this section, the Ni lb/hr emission limit, 

compute your Ni emission rate using Equation 5 of this section and your site-specific Ni 

operating limit (if you use a continuous opacity monitoring system) using Equations 6 and 7 of 

this section as follows: 

ENi1  CNi Qsd (Eq. 5) 

Where: 

ENi1 = Mass emission rate of Ni, mg/hr (lb/hr); and 

CNi = Ni concentration in the catalytic cracking unit catalyst regenerator flue gas as measured by 

Method 29 in appendix A to part 60 of this chapter, mg/dscm (lbs/dscf). 

st

st

1 Opacity NiEmR1 Opacity  

13g Ni/hr

 (Eq. 6) 

Where: 

Opacity1 = Opacity value for use in Equation 7 of this section, percent, or 10 percent, whichever 

is greater; and 

NiEmR1st = Average Ni emission rate calculated as the arithmetic average Ni emission rate using 

Equation 5 of this section for each of the performance test runs, g Ni/hr. 

Ni Operating Limit1  Opacity1 Qmon,st E-Catst (Eq. 7) 

Where: 

Ni Operating Limit1 = Maximum permissible hourly average Ni operating limit, percent-acfmppmw, i.e., your site-specific Ni operating limit; 

Qmon,st = Hourly average actual gas flow rate as measured by the continuous parameter 

monitoring system during the performance test or using the alternative procedure in §63.1573, 

acfm; and 

E-Catst = Ni concentration on equilibrium catalyst measured during source test, ppmw. 

(iv) If you elect Option 4 in paragraph (a)(1)(iv) of this section, the Ni lbs/1,000 lbs ofper coke 

burn-off emission limit, compute your Ni emission rate using Equations 1 and 8 of this section 

and your site-specific Ni operating limit (if you use a continuous opacity monitoring system) 

using Equations 9 and 10 of this section as follows: 
9 

c

Ni sd

Ni R

C Q E 2  (Eq. 8) 

Where: 

ENi2 = Normalized mass emission rate of Ni, mg/kg coke (lb/1,000 lbs coke). 

st

st

2 Opacity NiEmR2 Opacity  

1.0mg/kgcoke

 (Eq. 9) 

Where: 

Opacity2= Opacity value for use in Equation 10 of this section, percent, or 10 percent, whichever 

is greater; and 

NiEmR2st = Average Ni emission rate calculated as the arithmetic average Ni emission rate using 

Equation 8 of this section for each of the performance test runs, mg/kg coke. 

c st

mon st

2 2 st R

Q Ni Operating Limit Opacity E-Cat

,

,    (Eq. 10) 

Where: 

Ni Operating Limit2 = Maximum permissible hourly average Ni operating limit, percent-ppmwacfm-hr/kg coke, i.e., your site-specific Ni operating limit; and 

Rc,st = Coke burn rate from Equation 1 of this section, as measured during the initial performance 

test, kg coke/hr. 

(5) Demonstrate initial compliance with each emission limitation that applies to you according to 

Table 5 of this subpart. 

(6) Demonstrate initial compliance with the work practice standard in paragraph (a)(3) of this 

section by submitting your operation, maintenance, and monitoring plan to your permitting 

authority as part of your Notification of Compliance Status. 

(7) Submit the Notification of Compliance Status containing the results of the initial compliance 

demonstration according to the requirements in §63.1574. 

(c) How do I demonstrate continuous compliance with the emission limitations and work 

practice standards? You must: 

(1) Demonstrate continuous compliance with each emission limitation in Tables 1 and 2 of this 

subpart that applies to you according to the methods specified in Tables 6 and 7 of this subpart. 
10 

(2) Demonstrate continuous compliance with the work practice standard in paragraph (a)(3) of 

this section by maintaining records to document conformance with the procedures in your 

operation, maintenance, and monitoring plan. 

(3) If you use a continuous opacity monitoring system and elect to comply with Option 3 in 

paragraph (a)(1)(iii) of this section, determine continuous compliance with your site-specific Ni 

operating limit by using Equation 11 of this section as follows: 

Ni Operating Value Opacity Q E-Cat 1   mon  (Eq. 11) 

Where: 

Ni Operating Value1 = Maximum permissible hourly average Ni standard operating value, %-

acfm-ppmw; 

Opacity = Hourly average opacity, percent; 

Qmon = Hourly average actual gas flow rate as measured by continuous parameter monitoring 

system or calculated by alternative procedure in §63.1573, acfm; and 

E-Cat = Ni concentration on equilibrium catalyst from weekly or more recent measurement, 

ppmw. 

(4) If you use a continuous opacity monitoring system and elect to comply with Option 4 in 

paragraph (a)(1)(iv) of this section, determine continuous compliance with your site-specific Ni 

operating limit by using Equation 12 of this section as follows: 

c

mon

2 R

Opacity E-Cat Q Ni Operating Value    (Eq. 12) 

Where: 

Ni Operating Value2 = Maximum permissible hourly average Ni standard operating value, 

percent-acfm-ppmw-hr/kg coke. 

(5) During periods of startup only, if you elect to comply with the alternative limit in 

paragraph (a)(5)(ii) of this section, determine continuous compliance by: collecting opacity 

readings using either a continuous opacity monitoring system according to §63.1572 or 

manual opacity observations following EPA Method 9 in Appendix A-4 to part 60 of this 

chapter; and maintaining each 6-minute average opacity at or below 30 percent. 

§63.1565 What are my requirements for organic HAP emissions from catalytic cracking 

units? 

(a) What emission limitations and work practice standards must I meet? You must: 
11 

(1) Meet each emission limitation in Table 8 of this subpart that applies to you. If your catalytic 

cracking unit is subject to the NSPS for carbon monoxide (CO) in §60.103 of this chapter, you 

must meet the emission limitations for NSPS units. If your catalytic cracking unit isn't subject to 

the NSPS for CO, you can choose from the two options in paragraphs (a)(1)(i) through (ii) of this 

section: 

(i) You can elect to comply with the NSPS requirements (Option 1); or 

(ii) You can elect to comply with the CO emission limit (Option 2). 

(2) Comply with each site-specific operating limit in Table 9 of this subpart that applies to you. 

(3) Prepare an operation, maintenance, and monitoring plan according to the requirements in 

§63.1574(f) and operate at all times according to the procedures in the plan. 

(4) The emission limitations and operating limits for organic HAP emissions from catalytic 

cracking units required in paragraphs (a)(1) and (2) of this section do not apply during periods of 

planned maintenance preapproved by the applicable permitting authority according to the 

requirements in §63.1575(j). 

(5) During periods of startup only, if your catalytic cracking unit is not followed by a CO 

boiler, thermal oxidizer, incinerator, flare or similar combustion device, you can choose 

from the two options in paragraphs (a)(5)(i) and (ii) of this section: 

(i) You can elect to comply with the requirements in paragraphs (a)(1) and (2) of this 

section; or 

(ii) You can elect to maintain the oxygen (O2) concentration in the exhaust gas from your 

catalyst regenerator at or above 1 volume percent (dry basis). 

(b) How do I demonstrate initial compliance with the emission limitations and work practice 

standards? You must: 

(1) Install, operate, and maintain a continuous monitoring system according to the requirements 

in §63.1572 and Table 10 of this subpart. Except: 

(i) Whether or not your catalytic cracking unit is subject to the NSPS for CO in §60.103 of this 

chapter, you don't have to install and operate a continuous emission monitoring system if you 

show that CO emissions from your vent average less than 50 parts per million (ppm), dry basis. 

You must get an exemption from your permitting authority, based on your written request. To 

show that the emissions average is less than 50 ppm (dry basis), you must continuously monitor 

CO emissions for 30 days using a CO continuous emission monitoring system that meets the 

requirements in §63.1572. 

(ii) If your catalytic cracking unit isn't subject to the NSPS for CO, you don't have to install and 

operate a continuous emission monitoring system or a continuous parameter monitoring system 

if you vent emissions to a boiler (including a “CO boiler”) or process heater that has a design 

heat input capacity of at least 44 megawatts (MW). 
12 

(iii) If your catalytic cracking unit isn't subject to the NSPS for CO, you don't have to install and 

operate a continuous emission monitoring system or a continuous parameter monitoring system 

if you vent emissions to a boiler or process heater in which all vent streams are introduced into 

the flame zone. 

(iv) If you elect to comply with the alternative limit for periods of startup in paragraph 

(a)(5)(ii) of this section, you must also install, operate, and maintain a continuous 

parameter monitoring system to measure and record the oxygen content (percent, dry 

basis) in the catalyst regenerator vent. 

(2) Conduct each performance test for a catalytic cracking unit not subject to the NSPS for CO 

according to the requirements in §63.1571 and under the conditions specified in Table 11 of this 

subpart. 

(3) Establish each site-specific operating limit in Table 9 of this subpart that applies to you 

according to the procedures in Table 11 of this subpart. 

(4) Demonstrate initial compliance with each emission limitation that applies to you according to 

Table 12 of this subpart. 

(5) Demonstrate initial compliance with the work practice standard in paragraph (a)(3) of this 

section by submitting the operation, maintenance, and monitoring plan to your permitting 

authority as part of your Notification of Compliance Status according to §63.1574. 

(6) Submit the Notification of Compliance Status containing the results of the initial compliance 

demonstration according to the requirements in §63.1574. 

(c) How do I demonstrate continuous compliance with the emission limitations and work 

practice standards? You must: 

(1) Demonstrate continuous compliance with each emission limitation in Tables 8 and 9 of this 

subpart that applies to you according to the methods specified in Tables 13 and 14 of this 

subpart. 

(2) Demonstrate continuous compliance with the work practice standard in paragraph (a)(3) of 

this section by complying with the procedures in your operation, maintenance, and monitoring 

plan. 

(3) Demonstrate continuous compliance with the alternative limit in paragraph (a)(5)(ii) of 

this section by collecting the hourly average oxygen concentration monitoring data 

according to §63.1572 and maintaining the hourly average oxygen concentration at or 

above 1 volume percent (dry basis). 
13 

§63.1566 What are my requirements for organic HAP emissions from catalytic reforming 

units? 

(a) What emission limitations and work practice standards must I meet? You must: 

(1) Meet each emission limitation in Table 15 of this subpart that applies to you. You can choose 

from the two options in paragraphs (a)(1)(i) throughand (ii) of this section:.

(i) You can elect to vent emissions of total organic compounds (TOC) to a flare that 

meets(Option 1). On and after [THE DATE 3 YEARS AFTER THE DATE OF 

PUBLICATION OF THE FINAL RULE AMENDMENTS IN THE FEDERAL 

REGISTER], the flare must meet the requirements of §63.670. Prior to [THE DATE 3 

YEARS AFTER THE DATE OF PUBLICATION OF THE FINAL RULE 

AMENDMENTS IN THE FEDERAL REGISTER], the flare must meet the control device 

requirements in §63.11(b) (Option 1); or the requirements of §63.670.

(ii) You can elect to meet a TOC or nonmethane TOC percent reduction standard or 

concentration limit, whichever is less stringent (Option 2). 

(2) Comply with each site-specific operating limit in Table 16 of this subpart that applies to you. 

(3) Except as provided in paragraph (a)(4) of this section, the emission limitations in Tables 15 

and 16 of this subpart apply to emissions from catalytic reforming unit process vents associated 

with initial catalyst depressuring and catalyst purging operations that occur prior to the coke 

burn-off cycle. The emission limitations in Tables 15 and 16 of this subpart do not apply to the 

coke burn-off, catalyst rejuvenation, reduction or activation vents, or to the control systems used 

for these vents. 

(4) The emission limitations in Tables 15 and 16 of this subpart do not apply to emissions from 

process vents during passive depressuring and purging operations when the reactor vent pressure 

is 5 pounds per square inch gauge (psig) or less. The emission limitations in Tables 15 and 16 

of this subpart do apply to emissions from process vents during active purging operations 

(when nitrogen or other purge gas is actively introduced to the reactor vessel) or active 

depressuring (using a vacuum pump, ejector system, or similar device) regardless of the 

reactor vent pressure. 

(5) Prepare an operation, maintenance, and monitoring plan according to the requirements in 

§63.1574(f) and operate at all times according to the procedures in the plan. 

(b) How do I demonstrate initial compliance with the emission limitations and work practice 

standard? You must: 

(1) Install, operate, and maintain a continuous monitoring system(s) according to the 

requirements in §63.1572 and Table 17 of this subpart. 

(2) Conduct each performance test for a catalytic reforming unit according to the requirements in 

§63.1571 and under the conditions specified in Table 18 of this subpart. 
14 

(3) Establish each site-specific operating limit in Table 16 of this subpart that applies to you 

according to the procedures in Table 18 of this subpart. 

(4) Use the procedures in paragraph (b)(4)(i) or (ii) of this section to determine initial 

compliance with the emission limitations. 

(i) If you elect the percent reduction standard under Option 2, calculate the emission rate of 

nonmethane TOC using Equation 1 of this section (if you use Method 25) or Equation 2 of this 

section (if you use Method 25A or Methods 25A and 18), then calculate the mass emission 

reduction using Equation 3 of this section as follows: 

E  K4McQs (Eq. 1) 

Where: 

E = Emission rate of nonmethane TOC in the vent stream, kilograms-C per hour; 

K4 = Constant, 6.0 × 10−5

 (kilograms per milligram)(minutes per hour); 

Mc = Mass concentration of total gaseous nonmethane organic (as carbon) as measured and 

calculated using Method 25 in appendix A to part 60 of this chapter, mg/dscm; and 

Qs = Vent stream flow rate, dscm/min, at a temperature of 20 degrees Celsius (C). 

  E K5 CTOC Cmethane Qs 6   1 (Eq. 2) 

Where: 

K5 = Constant, 1.8×10−4 (parts per million)−1 (gram-mole per standard cubic meter) (gram-C per 

gram-mole-hexane) (kilogram per gram) (minutes per hour), where the standard temperature 

(standard cubic meter) is at 20 degrees C (uses 72g-C/g.mole hexane); 

CTOC = Concentration of TOC on a dry basis in ppmv as hexane as measured by Method 25A in 

appendix A to part 60 of this chapter; 

Cmethane = Concentration of methane on a dry basis in ppmv as measured by Method 18 in 

appendix A to part 60 of this chapter. If the concentration of methane is not determined, assume 

Cmethane equals zero; and 

Qs = Vent stream flow rate, dry standard cubic meters per minute, at a temperature of 20 degrees 

C. 

100%  

i

i o

E

E E %reduction (Eq. 3) 

Where: 
15 

Ei = Mass emission rate of TOC at control device inlet, kg/hr; and 

Eo = Mass emission rate of TOC at control device outlet, kg/hr. 

(ii) If you elect the 20 parts per million by volume (ppmv) concentration limit, correct the 

measured TOC concentration for oxygen (O2) content in the gas stream using Equation 4 of this 

section as follows: 

  















  

2

NMTOC, %O TOC methane %O

C C C

20.9%

17.9%

6

1

3 2 (Eq. 4) 

Where: 

CNMTOC, 3%O2 = Concentration of nonmethane TOC on a dry basis in ppmv as hexane corrected to 

3 percent oxygen. 

(5) You are not required to do a TOC performance test if: 

(i) You elect to vent emissions to a flare as provided in paragraph (a)(1)(i) of this section (Option 

1); or 

(ii) You elect the TOC percent reduction or concentration limit in paragraph (a)(1)(ii) of this 

section (Option 2), and you use a boiler or process heater with a design heat input capacity of 44 

MW or greater or a boiler or process heater in which all vent streams are introduced into the 

flame zone. 

(6) Demonstrate initial compliance with each emission limitation that applies to you according to 

Table 19 of this subpart. 

(7) Demonstrate initial compliance with the work practice standard in paragraph (a)(5) of this 

section by submitting the operation, maintenance, and monitoring plan to your permitting 

authority as part of your Notification of Compliance Status. 

(8) Submit the Notification of Compliance Status containing the results of the initial compliance 

demonstration according to the requirements in §63.1574. 

(c) How do I demonstrate continuous compliance with the emission limitations and work 

practice standards? You must: 

(1) Demonstrate continuous compliance with each emission limitation in Tables 15 and 16 of this 

subpart that applies to you according to the methods specified in Tables 20 and 21 of this 

subpart. 

(2) Demonstrate continuous compliance with the work practice standards in paragraph (a)(3) of 

this section by complying with the procedures in your operation, maintenance, and monitoring 

plan. 
16 

§63.1567 What are my requirements for inorganic HAP emissions from catalytic 

reforming units? 

(a) What emission limitations and work practice standards must I meet? You must: 

(1) Meet each emission limitation in Table 22 to this subpart that applies to you. If you operate a 

catalytic reforming unit in which different reactors in the catalytic reforming unit are regenerated 

in separate regeneration systems, then these emission limitations apply to each separate 

regeneration system. These emission limitations apply to emissions from catalytic reforming unit 

process vents associated with the coke burn-off and catalyst rejuvenation operations during coke 

burn-off and catalyst regeneration. You can choose from the two options in paragraphs (a)(1)(i) 

through (ii) of this section: 

(i) You can elect to meet a percent reduction standard for hydrogen chloride (HCl) emissions 

(Option 1); or 

(ii) You can elect to meet an HCl concentration limit (Option 2). 

(2) Meet each site-specific operating limit in Table 23 of this subpart that applies to you. These 

operating limits apply during coke burn-off and catalyst rejuvenation. 

(3) Prepare an operation, maintenance, and monitoring plan according to the requirements in 

§63.1574(f) and operate at all times according to the procedures in the plan. 

(b) How do I demonstrate initial compliance with the emission limitations and work practice 

standard? You must: 

(1) Install, operate, and maintain a continuous monitoring system(s) according to the 

requirements in §63.1572 and Table 24 of this subpart. 

(2) Conduct each performance test for a catalytic reforming unit according to the requirements in 

§63.1571 and the conditions specified in Table 25 of this subpart. 

(3) Establish each site-specific operating limit in Table 23 of this subpart that applies to you 

according to the procedures in Table 25 of this subpart. 

(4) Use the equations in paragraphs (b)(4)(i) through (iv) of this section to determine initial 

compliance with the emission limitations. 

(i) Correct the measured HCl concentration for oxygen (O2) content in the gas stream using 

Equation 1 of this section as follows: 

HCl

2

HCl, %O C

%O

C 















  20.9%

17.9%

3 2 (Eq. 1) 

Where: 
17 

CHCl,3%O2 = Concentration of HCl on a dry basis in ppmv corrected to 3 percent oxygen or 1 

ppmv, whichever is greater; 

CHCl = Concentration of HCl on a dry basis in ppmv, as measured by Method 26A in 40 CFR 

part 60, appendix A; and 

%O2 = Oxygen concentration in percent by volume (dry basis). 

(ii) If you elect the percent reduction standard, calculate the emission rate of HCl using Equation 

2 of this section; then calculate the mass emission reduction from the mass emission rates using 

Equation 3 of this section as follows: 

EHCl  K6CHClQs (Eq. 2) 

Where: 

EHCl = Emission rate of HCl in the vent stream, grams per hour; 

K6 = Constant, 0.091 (parts per million)−1 (grams HCl per standard cubic meter) (minutes per 

hour), where the standard temperature (standard cubic meter) is at 20 degrees Celsius (C); and 

Qs = Vent stream flow rate, dscm/min, at a temperature of 20 degrees C. 

100%

,

, ,   

HCl i

HCl i HCl o

E

E E

HCl%reduction (Eq. 3) 

Where: 

EHCl,i = Mass emission rate of HCl at control device inlet, g/hr; and 

EHCl,o = Mass emission rate of HCl at control device outlet, g/hr. 

(iii) If you are required to use a colormetric tube sampling system to demonstrate continuous 

compliance with the HCl concentration operating limit, calculate the HCl operating limit using 

Equation 4 of this section as follows: 















 

HCl,3%O2

HCl,RegLimit

HCl,ppmvLimit HCl,AveTube C

C

C 0.9C (Eq. 4) 

Where: 

CHCl,ppmvLimit = Maximum permissible HCl concentration for the HCl concentration operating 

limit, ppmv; 

CHCl,AveTube = Average HCl concentration from the colormetric tube sampling system, calculated 

as the arithmetic average of the average HCl concentration measured for each performance test 

run, ppmv or 1 ppmv, whichever is greater; and 
18 

CHCl,RegLimit = Maximum permissible outlet HCl concentration for the applicable catalytic 

reforming unit as listed in Table 22 of this subpart, either 10 or 30 ppmv. 

(iv) If you are required to use a colormetric tube sampling system to demonstrate continuous 

compliance with the percent reduction operating limit, calculate the HCl operating limit using 

Equation 5 of this section as follows: 



















 

Test

Limit

HCl,%Limit HCl,AveTube %HClReduction

%HClReduction C C

100

100 0.9 (Eq. 5) 

Where: 

CHCl,%Limit = Maximum permissible HCl concentration for the percent reduction operating limit, 

ppmv; 

%HCl ReductionLimit = Minimum permissible HCl reduction for the applicable catalytic 

reforming unit as listed in Table 22 of this subpart, either 97 or 92 percent; and 

%HCl ReductionTest = Average percent HCl reduction calculated as the arithmetic average HCl 

reduction calculated using Equation 3 of this section for each performance source test, percent. 

(5) Demonstrate initial compliance with each emission limitation that applies to you according to 

Table 26 of this subpart. 

(6) Demonstrate initial compliance with the work practice standard in paragraph (a)(3) of this 

section by submitting the operation, maintenance, and monitoring plan to your permitting 

authority as part of your Notification of Compliance Status. 

(7) Submit the Notification of Compliance Status containing the results of the initial compliance 

demonstration according to the requirements in §63.1574. 

(c) How do I demonstrate continuous compliance with the emission limitations and work 

practice standard? You must: 

(1) Demonstrate continuous compliance with each emission limitation in Tables 22 and 23 of this 

subpart that applies to you according to the methods specified in Tables 27 and 28 of this 

subpart. 

(2) Demonstrate continuous compliance with the work practice standard in paragraph (a)(3) of 

this section by maintaining records to document conformance with the procedures in your 

operation, maintenance and monitoring plan. 

§63.1568 What are my requirements for HAP emissions from sulfur recovery units? 

(a) What emission limitations and work practice standard must I meet? You must: 
19 

(1) Meet each emission limitation in Table 29 of this subpart that applies to you. If your sulfur 

recovery unit is subject to the NSPS for sulfur oxides in §60.104 or in §60.102a(f)(1) of this 

chapter, you must meet the emission limitations for NSPS units. If your sulfur recovery unit 

isn'tis not subject to theone of these NSPS for sulfur oxides, you can choose from the options in 

paragraphs (a)(1)(i) through (ii) of this section: 

(i) You can elect to meet the NSPS requirements in §60.104(a)(2) or in §60.102a(f)(1) of this 

chapter (Option 1); or 

(ii) You can elect to meet the total reduced sulfur (TRS) emission limitation (Option 2). 

(2) Meet each operating limit in Table 30 of this subpart that applies to you. 

(3) Prepare an operation, maintenance, and monitoring plan according to the requirements in 

§63.1574(f) and operate at all times according to the procedures in the plan. 

(4) During periods of shutdown only, you can choose from the three options in paragraphs 

(a)(4)(i) through (iii) of this section. 

(i) You can elect to comply with the requirements in paragraphs (a)(1) and (2) of this 

section. 

(ii) You can elect to send any shutdown purge gases to a flare. On and after [THE DATE 3 

YEARS AFTER THE DATE OF PUBLICATION OF THE FINAL RULE 

AMENDMENTS IN THE FEDERAL REGISTER], the flare must meet the requirements 

of §63.670. Prior to [THE DATE 3 YEARS AFTER THE DATE OF PUBLICATION OF 

THE FINAL RULE AMENDMENTS IN THE FEDERAL REGISTER], the flare must 

meet the design and operating requirements in §63.11(b) or the requirements of §63.670. 

(iii) You can elect to send any shutdown purge gases to a to a thermal oxidizer or 

incinerator operated at a minimum hourly average temperature of 1,200 degrees 

Fahrenheit and a minimum hourly average outlet oxygen (O2) concentration of 2 volume 

percent (dry basis). 

(b) How do I demonstrate initial compliance with the emission limitations and work practice 

standards? You must: 

(1) Install, operate, and maintain a continuous monitoring system according to the requirements 

in §63.1572 and Table 31 of this subpart. Except:

(i) If you elect to comply with the alternative limit for periods of shutdown in paragraph 

(a)(4)(ii) of this section, then on and after [THE DATE 3 YEARS AFTER THE DATE OF 

PUBLICATION OF THE FINAL RULE AMENDMENTS IN THE FEDERAL 

REGISTER], you must also install, operate, calibrate, and maintain monitoring systems as 

specified in §§63.670 and 63.671. Prior to [THE DATE 3 YEARS AFTER THE DATE OF 

PUBLICATION OF THE FINAL RULE AMENDMENTS IN THE FEDERAL 

REGISTER], you must either install, operate, and maintain continuous parameter 

monitoring systems following the requirements in §63.11 (to detect the presence of a flame; 
20 

to measure and record the net heating value of the gas being combusted; and to measure 

and record the volumetric flow of the gas being combusted) or install, operate, calibrate, 

and maintain monitoring systems as specified in §§63.670 and 63.671. 

(ii) If you elect to comply with the alternative limit for periods of shutdown in paragraph 

(a)(4)(iii) of this section, you must also install, operate, and maintain continuous parameter 

monitoring system to measure and record the temperature and oxygen content (percent, 

dry basis) in the vent from the thermal oxidizer or incinerator. 

(2) Conduct each performance test for a sulfur recovery unit not subject to the NSPS for sulfur 

oxides according to the requirements in §63.1571 and under the conditions specified in Table 32 

of this subpart. 

(3) Establish each site-specific operating limit in Table 30 of this subpart that applies to you 

according to the procedures in Table 32 of this subpart. 

(4) Correct the reduced sulfur samples to zero percent excess air using Equation 1 of this section 

as follows: 

















 

2

c

adj meas %O

C C

20.9

20.9

 (Eq. 1) 

Where: 

Cadj = pollutant concentration adjusted to zero percent oxygen, ppm or g/dscm; 

Cmeas = pollutant concentration measured on a dry basis, ppm or g/dscm; 

20.9c = 20.9 percent oxygen—0.0 percent oxygen (defined oxygen correction basis), percent; 

20.9 = oxygen concentration in air, percent; 

%O2 = oxygen concentration measured on a dry basis, percent. 

(5) Demonstrate initial compliance with each emission limitation that applies to you according to 

Table 33 of this subpart. 

(6) Demonstrate initial compliance with the work practice standard in paragraph (a)(3) of this 

section by submitting the operation, maintenance, and monitoring plan to your permitting 

authority as part of your notification of compliance status. 

(7) Submit the notification of compliance status containing the results of the initial compliance 

demonstration according to the requirements in §63.1574. 

(c) How do I demonstrate continuous compliance with the emission limitations and work 

practice standards? You must: 
21 

(1) Demonstrate continuous compliance with each emission limitation in Tables 29 and 30 of this 

subpart that applies to you according to the methods specified in Tables 34 and 35 of this 

subpart. 

(2) Demonstrate continuous compliance with the work practice standard in paragraph (a)(3) of 

this section by complying with the procedures in your operation, maintenance, and monitoring 

plan. 

(3) Demonstrate continuous compliance with the alternative limit in paragraph (a)(4)(ii) of 

this section by meeting the requirements of either paragraph (c)(3)(i) or (ii) of this section. 

(i) On and after [THE DATE 3 YEARS AFTER THE DATE OF PUBLICATION OF THE 

FINAL RULE AMENDMENTS IN THE FEDERAL REGISTER], you must meet the 

requirements of paragraphs (c)(3)(i)(A) through (C) of this section. 

(A) Collect the flare monitoring data according to §§63.670 and 63.671. 

(B) Keep the records specified in §63.655(i)(9). 

(C) Maintain the selected operating parameters as specified in §63.670. 

(ii) Prior to [THE DATE 3 YEARS AFTER THE DATE OF PUBLICATION OF THE 

FINAL RULE AMENDMENTS IN THE FEDERAL REGISTER], you must either meet 

the requirements of paragraph (c)(3)(i) of this section or meet the requirements of 

paragraphs (c)(3)(ii)(A) through (D) of this section. 

(A) Collect the flare monitoring data according to §63.1572. 

(B) Record for each 1-hour period whether the monitor was continuously operating and the 

pilot light was continuously present during each 1-hour period. 

(C) Maintain the net heating value of the gas being combusted at or above the applicable 

limits in §63.11. 

(D) Maintain the exit velocity at or below the applicable maximum exit velocity specified in 

§63.11. 

(4) Demonstrate continuous compliance with the alternative limit in paragraph (a)(4)(iii) of 

this section by collecting the hourly average temperature and oxygen concentration 

monitoring data according to §63.1572; maintaining the hourly average temperature at or 

above 1,200 degrees Fahrenheit; and maintaining the hourly average oxygen concentration 

at or above 2 volume percent (dry basis). 
22 

§63.1569 What are my requirements for HAP emissions from bypass lines? 

(a) What work practice standards must I meet? (1) You must meet each work practice standard 

in Table 36 of this subpart that applies to you. You can choose from the four options in 

paragraphs (a)(1)(i) through (iv) of this section: 

(i) You can elect to install an automated system (Option 1); 

(ii) You can elect to use a manual lock system (Option 2); 

(iii) You can elect to seal the line (Option 3); or 

(iv) You can elect to vent to a control device (Option 4). 

(2) As provided in §63.6(g), we, the EPA, may choose to grant you permission to use an 

alternative to the work practice standard in paragraph (a)(1) of this section. 

(3) You must prepare an operation, maintenance, and monitoring plan according to the 

requirements in §63.1574(f) and operate at all times according to the procedures in the plan. 

(b) How do I demonstrate initial compliance with the work practice standards? You must: 

(1) If you elect the option in paragraph (a)(1)(i) of this section, conduct each performance test for 

a bypass line according to the requirements in §63.1571 and under the conditions specified in 

Table 37 of this subpart. 

(2) Demonstrate initial compliance with each work practice standard in Table 36 of this subpart 

that applies to you according to Table 38 of this subpart. 

(3) Demonstrate initial compliance with the work practice standard in paragraph (a)(3) of this 

section by submitting the operation, maintenance, and monitoring plan to your permitting 

authority as part of your notification of compliance status. 

(4) Submit the notification of compliance status containing the results of the initial compliance 

demonstration according to the requirements in §63.1574. 

(c) How do I demonstrate continuous compliance with the work practice standards? You must: 

(1) Demonstrate continuous compliance with each work practice standard in Table 36 of this 

subpart that applies to you according to the requirements in Table 39 of this subpart. 

(2) Demonstrate continuous compliance with the work practice standard in paragraph (a)(2) of 

this section by complying with the procedures in your operation, maintenance, and monitoring 

plan. 
23 

General Compliance Requirements 

§63.1570 What are my general requirements for complying with this subpart? 

(a) You must be in compliance with all of the non-opacity standards in this subpart during theat 

all times specified in §63.6(f)(1). 

(b) You must be in compliance with the opacity and visible emission limits in this subpart during 

theat all times specified in §63.6(h)(1). 

(c) At all times, yYou must always operate and maintain any your affected source, including 

associated air pollution control equipment and monitoring equipment, in a manner consistent 

with safety and good air pollution control practices for minimizing emissionsaccording to 

the provisions in §63.6(e)(1)(i). The general duty to minimize emissions does not require you 

to make any further efforts to reduce emissions if levels required by the applicable 

standard have been achieved. Determination of whether a source is operating in 

compliance with operation and maintenance requirements will be based on information 

available to the Administrator which may include, but is not limited to, monitoring results, 

review of operation and maintenance procedures, review of operation and maintenance 

records, and inspection of the source. 

(d) During the period between the compliance date specified for your affected source and the 

date upon which continuous monitoring systems have been installed and validated and any 

applicable operating limits have been set, you must maintain a log detailing the operation and 

maintenance of the process and emissions control equipment. 

(d) You must develop a written startup, shutdown, and malfunction plan (SSMP) according to 

the provisions in §63.6(e)(3). 

(e) [Reserved] 

(f) You must report each instance in which you did not meet each emission limitation and each 

operating limit in this subpart that applies to you. This includes periods of startup, shutdown, and 

malfunction. You also must report each instance in which you did not meet the work practice 

standards in this subpart that apply to you. These instances are deviations from the emission 

limitations and work practice standards in this subpart. These deviations must be reported 

according to the requirements in §63.1575. 

(g) [Reserved]Consistent with §§63.6(e) and 63.7(e)(1), deviations that occur during a period of 

startup, shutdown, or malfunction are not violations if you demonstrate to the Administrator's 

satisfaction that you were operating in accordance with §63.6(e)(1). The SSMP must include 

elements designed to minimize the frequency of such periods (i.e., root cause analysis). The 

Administrator will determine whether deviations that occur during a period of startup, shutdown, 

or malfunction are violations, according to the provisions in §63.6(e).
24 

§63.1571 How and when do I conduct a performance test or other initial compliance 

demonstration? 

(a) When must I conduct a performance test? You must conduct performance tests and report the 

results by no later than 150 days after the compliance date specified for your source in §63.1563 

and according to the provisions in §63.7(a)(2). If you are required to do a performance 

evaluation or test for a semi-regenerative catalytic reforming unit catalyst regenerator vent, you 

may do them at the first regeneration cycle after your compliance date and report the results in a 

followup Notification of Compliance Status report due no later than 150 days after the test. 

(1) For each emission limitation or work practice standard where initial compliance is not 

demonstrated using a performance test, opacity observation, or visible emission observation, you 

must conduct the initial compliance demonstration within 30 calendar days after the compliance 

date that is specified for your source in §63.1563. 

(2) For each emission limitation where the averaging period is 30 days, the 30-day period for 

demonstrating initial compliance begins at 12:00 a.m. on the compliance date that is specified for 

your source in §63.1563 and ends at 11:59 p.m., 30 calendar days after the compliance date that 

is specified for your source in §63.1563. 

(3) If you commenced construction or reconstruction between September 11, 1998 and April 11, 

2002, you must demonstrate initial compliance with either the proposed emission limitation or 

the promulgated emission limitation no later than October 8, 2002 or within 180 calendar days 

after startup of the source, whichever is later, according to §63.7(a)(2)(ix). 

(4) If you commenced construction or reconstruction between September 11, 1998 and April 11, 

2002, and you chose to comply with the proposed emission limitation when demonstrating initial 

compliance, you must conduct a second compliance demonstration for the promulgated emission 

limitation by October 10, 2005, or after startup of the source, whichever is later, according to 

§63.7(a)(2)(ix). 

(5) Conduct a performance test for PM or Ni, as applicable, from catalytic cracking units 

at least once every 5 years for those units monitored with CPMS, BLD, or COMS. You 

must conduct the first periodic performance test no later than [THE DATE 18 MONTHS 

AFTER THE DATE OF PUBLICATION OF THE FINAL RULE AMENDMENTS IN 

THE FEDERAL REGISTER]. Those units monitoring PM concentration with a PM 

CEMS are not required to conduct a periodic PM performance test. 

(b) What are the general requirements for performance test and performance evaluations? You 

must: 

(1) Conduct each performance tests under such conditions as the Administrator specifies to 

you based on representative performance of the affected source for the period being tested. 

Representative conditions exclude periods of startup and shutdown unless specified by the 

Administrator or an applicable subpart. You may not conduct performance tests during 

periods of malfunction. You must record the process information that is necessary to 

document operating conditions during the test and include in such record an explanation to 

support that such conditions represent normal operation. Upon request, you must make 
25 

available to the Administrator such records as may be necessary to determine the 

conditions of performance tests according to the requirements in §63.7(e)(1). 

(2) Except for opacity and visible emission observations, conduct three separate test runs for 

each performance test as specified in §63.7(e)(3). Each test run must last at least 1 hour. 

(3) Conduct each performance evaluation according to the requirements in §63.8(e). 

(4) Not conduct performance tests during periods of startup, shutdown, or malfunction, as 

specified in §63.7(e)(1). 

(5) Calculate the average emission rate for the performance test by calculating the emission rate 

for each individual test run in the units of the applicable emission limitation using Equation 2, 5, 

or 8 of §63.1564, and determining the arithmetic average of the calculated emission rates. 

(c) What procedures must I use for an engineering assessment? You may choose to use an 

engineering assessment to calculate the process vent flow rate, net heating value, TOC emission 

rate, and total organic HAP emission rate expected to yield the highest daily emission rate when 

determining the emission reduction or outlet concentration for the organic HAP standard for 

catalytic reforming units. If you use an engineering assessment, you must document all data, 

assumptions, and procedures to the satisfaction of the applicable permitting authority. An 

engineering assessment may include the approaches listed in paragraphs (c)(1) through (c)(4) of 

this section. Other engineering assessments may be used but are subject to review and approval 

by the applicable permitting authority. 

(1) You may use previous test results provided the tests are representative of current operating 

practices at the process unit, and provided EPA methods or approved alternatives were used; 

(2) You may use bench-scale or pilot-scale test data representative of the process under 

representative operating conditions; 

(3) You may use maximum flow rate, TOC emission rate, organic HAP emission rate, or organic 

HAP or TOC concentration specified or implied within a permit limit applicable to the process 

vent; or 

(4) You may use design analysis based on engineering principles, measurable process 

parameters, or physical or chemical laws or properties. Examples of analytical methods include, 

but are not limited to: 

(i) Use of material balances based on process stoichiometry to estimate maximum TOC 

concentrations; 

(ii) Calculation of hourly average maximum flow rate based on physical equipment design such 

as pump or blower capacities; and 

(iii) Calculation of TOC concentrations based on saturation conditions. 
26 

(d) Can I adjust the process or control device measured values when establishing an operating 

limit? If you do a performance test to demonstrate compliance, you must base the process or 

control device operating limits for continuous parameter monitoring systems on the results 

measured during the performance test. You may adjust the values measured during the 

performance test according to the criteria in paragraphs (d)(1) through (3) of this section. 

(1) If you must meet the HAP metal emission limitations in §63.1564, you elect the option in 

paragraph (a)(1)(iii) in §63.1564 (Ni lb/hr), and you use continuous parameter monitoring 

systems, you must establish an operating limit for the equilibrium catalyst Ni concentration 

based on the laboratory analysis of the equilibrium catalyst Ni concentration from the initial 

performance test. Section 63.1564(b)(2) allows you to adjust the laboratory measurements of the 

equilibrium catalyst Ni concentration to the maximum level. You must make this adjustment 

using Equation 1 of this section as follows: 

st

st

Ecat

NiEmR1

Ecat-Limit 

13g Ni/hr

 (Eq. 1) 

Where: 

Ecat-Limit = Operating limit for equilibrium catalyst Ni concentration, mg/kg; 

NiEmR1st = Average Ni emission rate calculated as the arithmetic average Ni emission rate using 

Equation 5 of this section for each performance test run, g Ni/hr; and 

Ecatst = Average equilibrium Ni concentration from laboratory test results, mg/kg. 

(2) If you must meet the HAP metal emission limitations in §63.1564, you elect the option in 

paragraph (a)(1)(iv) in §63.1564 (Ni lb/1,000 lb ofper coke burn-off), and you use continuous 

parameter monitoring systems, you must establish an operating limit for the equilibrium catalyst 

Ni concentration based on the laboratory analysis of the equilibrium catalyst Ni concentration 

from the initial performance test. Section 63.1564(b)(2) allows you to adjust the laboratory 

measurements of the equilibrium catalyst Ni concentration to the maximum level. You must 

make this adjustment using Equation 2 of this section as follows: 

st

st

Ecat

NiEmR2

Ecat-Limit 

1.0mg/kgcokeburn- off

 (Eq. 2) 

Where: 

NiEmR2st = Average Ni emission rate calculated as the arithmetic average Ni emission rate using 

Equation 8 of §63.1564 for each performance test run, mg/kg coke burn-off. 

(3) If you choose to adjust the equilibrium catalyst Ni concentration to the maximum level, you 

can't adjust any other monitored operating parameter (i.e., gas flow rate, voltage, pressure drop, 

liquid-to-gas ratio). 
27 

(4) Except as specified in paragraph (d)(3) of this section, if you use continuous parameter 

monitoring systems, you may adjust one of your monitored operating parameters (flow rate, 

voltagetotal power and secondary current, pressure drop, liquid-to-gas ratio) from the average of 

measured values during the performance test to the maximum value (or minimum value, if 

applicable) representative of worst-case operating conditions, if necessary. This adjustment of 

measured values may be done using control device design specifications, manufacturer 

recommendations, or other applicable information. You must provide supporting documentation 

and rationale in your Notification of Compliance Status, demonstrating to the satisfaction of your 

permitting authority, that your affected source complies with the applicable emission limit at the 

operating limit based on adjusted values. 

(e) Can I change my operating limit? You may change the established operating limit by meeting 

the requirements in paragraphs (e)(1) through (3) of this section. 

(1) You may change your established operating limit for a continuous parameter monitoring 

system by doing an additional performance test, a performance test in conjunction with an 

engineering assessment, or an engineering assessment to verify that, at the new operating limit, 

you are in compliance with the applicable emission limitation. 

(2) You must establish a revised operating limit for your continuous parameter monitoring 

system if you make any change in process or operating conditions that could affect control 

system performance or you change designated conditions after the last performance or 

compliance tests were done. You can establish the revised operating limit as described in 

paragraph (e)(1) of this section. 

(3) You may change your site-specific opacity operating limit or Ni operating limit only by 

doing a new performance test. 

§63.1572 What are my monitoring installation, operation, and maintenance 

requirements? 

(a) You must install, operate, and maintain each continuous emission monitoring system 

according to the requirements in paragraphs (a)(1) through (4) of this section. 

(1) You must install, operate, and maintain each continuous emission monitoring system 

according to the requirements in Table 40 of this subpart. 

(2) If you use a continuous emission monitoring system to meet the NSPS CO or SO2 limit, you 

must conduct a performance evaluation of each continuous emission monitoring system 

according to the requirements in §63.8 and Table 40 of this subpart. This requirement does not 

apply to an affected source subject to the NSPS that has already demonstrated initial compliance 

with the applicable performance specification. 

(3) As specified in §63.8(c)(4)(ii), each continuous emission monitoring system must complete a 

minimum of one cycle of operation (sampling, analyzing, and data recording) for each 

successive 15-minute period. 
28 

(4) Data must be reduced as specified in §63.8(g)(2). 

(b) You must install, operate, and maintain each continuous opacity monitoring system according 

to the requirements in paragraphs (b)(1) through (3) of this section. 

(1) Each continuous opacity monitoring system must be installed, operated, and maintained 

according to the requirements in Table 40 of this subpart. 

(2) If you use a continuous opacity monitoring system to meet the NSPS opacity limit, you must 

conduct a performance evaluation of each continuous opacity monitoring system according to the 

requirements in §63.8 and Table 40 of this subpart. This requirement does not apply to an 

affected source subject to the NSPS that has already demonstrated initial compliance with the 

applicable performance specification. 

(3) As specified in §63.8(c)(4)(i), each continuous opacity monitoring system must complete a 

minimum of one cycle of sampling and analyzing for each successive 10-second period and one 

cycle of data recording for each successive 6-minute period. 

(c) Except for flare monitoring systems, yYou must install, operate, and maintain each 

continuous parameter monitoring system according to the requirements in paragraphs (c)(1) 

through (5) of this section. For flares, on and after [THE DATE 3 YEARS AFTER THE 

DATE OF PUBLICATION OF THE FINAL RULE AMENDMENTS IN THE FEDERAL 

REGISTER], you must install, operate, calibrate, and maintain monitoring systems as 

specified in §§63.670 and 63.671. Prior to [THE DATE 3 YEARS AFTER THE DATE OF 

PUBLICATION OF THE FINAL RULE AMENDMENTS IN THE FEDERAL 

REGISTER], you must either meet the monitoring system requirements in paragraphs 

(c)(1) through (5) of this section or meet the requirements in §§63.670 and 63.671.

(1) You mustThe owner or operator shall install, operate, and maintain each continuous 

parameter monitoring system according to the requirements in Table 41 of this subpartin a 

manner consistent with the manufacturer's specifications or other written procedures that provide 

adequate assurance that the equipment will monitor accurately. You mustThe owner or operator 

shall also meet the equipment specifications in Table 41 of this subpart if pH strips or 

colormetric tube sampling systems are used. You must meet the requirements in Table 41 of 

this subpart for BLD systems.

(2) The continuous parameter monitoring system must complete a minimum of one cycle of 

operation for each successive 15-minute period. You must have a minimum of four successive 

cycles of operation to have a valid hour of data (or at least two if a calibration check is 

performed during that hour or if the continuous parameter monitoring system is out-of-control). 

(3) Each continuous parameter monitoring system must have valid hourly average data from at 

least 75 percent of the hours during which the process operated, except for BLD systems. 

(4) Each continuous parameter monitoring system must determine and record the hourly average 

of all recorded readings and if applicable, the daily average of all recorded readings for each 

operating day, except for BLD systems. The daily average must cover a 24-hour period if 
29 

operation is continuous or the number of hours of operation per day if operation is not 

continuous, except for BLD systems. 

(5) Each continuous parameter monitoring system must record the results of each inspection, 

calibration, and validation check. 

(d) You must monitor and collect data according to the requirements in paragraphs (d)(1) and (2) 

of this section. 

(1) Except for monitoring malfunctions, associated repairs, and required quality assurance or 

control activities (including as applicable, calibration checks and required zero and span 

adjustments), youYou must conduct all monitoring in continuous operation (or collect data at all 

required intervals) at all times the affected source is operating. 

(2) You may not use data recorded during monitoring malfunctions, associated repairs, and 

required quality assurance or control activities (including, as applicable, calibration checks 

and required zero and span adjustments) for purposes of this regulation, including data 

averages and calculations, for fulfilling a minimum data availability requirement, if applicable. 

You must use all the data collected during all other periods in assessing the operation of the 

control device and associated control system. 

§63.1573 What are my monitoring alternatives? 

(a) What are the approved alternatives for measuring gas flow rate? (1) You may use this 

alternative to a continuous parameter monitoring system for the catalytic regenerator exhaust gas 

flow rate for your catalytic cracking unit if the unit does not introduce any other gas streams into 

the catalyst regeneration vent (i.e., complete combustion units with no additional combustion 

devices). You may also use this alternative to a continuous parameter monitoring system for the 

catalytic regenerator atmospheric exhaust gas flow rate for your catalytic reforming unit during 

the coke burn and rejuvenation cycles if the unit operates as a constant pressure system during 

these cycles. If you use this alternative, you shall use the same procedure for the performance 

test and for monitoring after the performance test. You shall: 

(i) Install and operate a continuous parameter monitoring system to measure and record the 

hourly average volumetric air flow rate to the catalytic cracking unit or catalytic reforming unit 

regenerator. Or, you may determine and record the hourly average volumetric air flow rate to the 

catalytic cracking unit or catalytic reforming unit regenerator using the appropriate control room 

instrumentation. 

(ii) Install and operate a continuous parameter monitoring system to measure and record the 

temperature of the gases entering the control device (or exiting the catalyst regenerator if you do 

not use an add-on control device). 

(iii) Calculate and record the hourly average actual exhaust gas flow rate using Equation 1 of this 

section as follows: 
30 

  































    

 



 

vent

gas

gas air other P

Temp Q Q Q 1atm

dscfm 293 K

scfm 1.12 (Eq. 1) 

Where 

Qgas = Hourly average actual gas flow rate, acfm; 

1.12 = Default correction factor to convert gas flow from dry standard cubic feet per minute 

(dscfm) to standard cubic feet per minute (scfm); 

Qair = Volumetric flow rate of air to regenerator, as determined from the control room 

instrumentations, dscfm; 

Qother = Volumetric flow rate of other gases entering the regenerator as determined from the 

control room instrumentations, dscfm. (Examples of “other” gases include an oxygen-enriched 

air stream to catalytic cracking unit regenerators and a nitrogen stream to catalytic reforming unit 

regenerators.); 

Tempgas = Temperature of gas stream in vent measured as near as practical to the control device 

or opacity monitor, °K. For wet scrubbers, temperature of gas prior to the wet scrubber; and 

Pvent = Absolute pressure in the vent measured as near as practical to the control device or 

opacity monitor, as applicable, atm. When used to assess the gas flow rate in the final 

atmospheric vent stack, you can assume Pvent = 1 atm. 

(2) You may use this alternative to calculating Qr, the volumetric flow rate of exhaust gas for the 

catalytic cracking regenerator as required in Equation 1 of §63.1564, if you have a gas analyzer 

installed in the catalytic cracking regenerator exhaust vent prior to the addition of air or other gas 

streams. You may measure upstream or downstream of an electrostatic precipitator, but you shall 

measure upstream of a carbon monoxide boiler. You shall: 

(i) Install and operate a continuous parameter monitoring system to measure and record the 

hourly average volumetric air flow rate to the catalytic cracking unit regenerator. Or, you can 

determine and record the hourly average volumetric air flow rate to the catalytic cracking unit 

regenerator using the catalytic cracking unit control room instrumentation. 

(ii) Install and operate a continuous gas analyzer to measure and record the concentration of 

carbon dioxide, carbon monoxide, and oxygen of the catalytic cracking regenerator exhaust. 

(iii) Calculate and record the hourly average flow rate using Equation 2 of this section as 

follows: 

 

2 2

air xy oxy

r %CO %CO %O

Q %O Q Q        100

79 100

 (Eq. 2) 

Where: 
31 

Qr = Volumetric flow rate of exhaust gas from the catalyst regenerator before adding air or gas 

streams, dscm/min (dscf/min); 

79 = Default concentration of nitrogen and argon in dry air, percent by volume (dry basis); 

%Oxy = Oxygen concentration in oxygen-enriched air stream, percent by volume (dry basis); 

Qoxy = Volumetric flow rate of oxygen-enriched air stream to regenerator as determined from the 

catalytic cracking unit control room instrumentations, dscm/min (dscf/min); 

%CO2 = Carbon dioxide concentration in regenerator exhaust, percent by volume (dry basis); 

CO = Carbon monoxide concentration in regenerator exhaust, percent by volume (dry basis); and 

%O2 = Oxygen concentration in regenerator exhaust, percent by volume (dry basis). 

(b) What is the approved alternative for monitoring pressure drop? You may use this 

alternative to a continuous parameter monitoring system for pressure drop if you operate a 

jet ejector type wet scrubber or other type of wet scrubber equipped with atomizing spray 

nozzles. You shall: 

(1) Conduct a daily check of the air or water pressure to the spray nozzles; 

(2) Maintain records of the results of each daily check; and 

(3) Repair or replace faulty (e.g., leaking or plugged) air or water lines within 12 hours of 

identification of an abnormal pressure reading. 

(cb) What is the approved alternative for monitoring pH or alkalinity levels? You may use the 

alternative in paragraph (bc)(1) or (2) of this section for a catalytic reforming unit. 

(1) You shall measure and record the pH of the water (or scrubbing liquid) exiting the wet 

scrubber or internal scrubbing system at least once an hour during coke burn-off and catalyst 

rejuvenation using pH strips as an alternative to a continuous parameter monitoring system. The 

pH strips must meet the requirements in Table 41 of this subpart. 

(2) You shall measure and record the alkalinity of the water (or scrubbing liquid) exiting the wet 

scrubber or internal scrubbing system at least once an hour during coke burn-off and catalyst 

rejuvenation using titration as an alternative to a continuous parameter monitoring system. 

(cd) Can I use another type of monitoring system? You may request approval from your 

permitting authority to use an automated data compression system. An automated data 

compression system does not record monitored operating parameter values at a set frequency 

(e.g., once every hour) but records all values that meet set criteria for variation from previously 

recorded values. Your request must contain a description of the monitoring system and data 

recording system, including the criteria used to determine which monitored values are recorded 

and retained, the method for calculating daily averages, and a demonstration that the system 

meets all of the criteria in paragraphs (cd)(1) through (5) of this section: 
32 

(1) The system measures the operating parameter value at least once every hour; 

(2) The system records at least 24 values each day during periods of operation; 

(3) The system records the date and time when monitors are turned off or on; 

(4) The system recognizes unchanging data that may indicate the monitor is not functioning 

properly, alerts the operator, and records the incident; and 

(5) The system computes daily average values of the monitored operating parameter based on 

recorded data. 

(de) Can I monitor other process or control device operating parameters? You may request 

approval to monitor parameters other than those required in this subpart. You must request 

approval if: 

(1) You use a control device other than a thermal incinerator, boiler, process heater, flare, 

electrostatic precipitator, or wet scrubber; 

(2) You use a combustion control device (e.g., incinerator, flare, boiler or process heater with a 

design heat capacity of at least 44 MW, boiler or process heater where the vent stream is 

introduced into the flame zone), electrostatic precipitator, or scrubber but want to monitor a 

parameter other than those specified; or 

(3) You wish to use another type of continuous emission monitoring system that provides direct 

measurement of a pollutant (i.e., a PM or multi-metals HAP continuous emission monitoring 

system, a carbonyl sulfide/carbon disulfide continuous emission monitoring system, a TOC 

continuous emission monitoring system, or HCl continuous emission monitoring system). 

(ef) How do I request to monitor alternative parameters? You must submit a request for review 

and approval or disapproval to the Administrator. The request must include the information in 

paragraphs (ef)(1) through (5) of this section. 

(1) A description of each affected source and the parameter(s) to be monitored to determine 

whether the affected source will continuously comply with the emission limitations and an 

explanation of the criteria used to select the parameter(s). 

(2) A description of the methods and procedures that will be used to demonstrate that the 

parameter can be used to determine whether the affected source will continuously comply with 

the emission limitations and the schedule for this demonstration. You must certify that you will 

establish an operating limit for the monitored parameter(s) that represents the conditions in 

existence when the control device is being properly operated and maintained to meet the 

emission limitation. 

(3) The frequency and content of monitoring, recording, and reporting, if monitoring and 

recording are not continuous. You also must include the rationale for the proposed monitoring, 

recording, and reporting requirements. 
33 

(4) Supporting calculations. 

(5) Averaging time for the alternative operating parameter. 

(fg) How do I apply for alternative monitoring requirements if my catalytic cracking unit is 

equipped with a wet scrubber and I have approved alternative monitoring requirements under 

the new source performance standards for petroleum refineries?

(1) You may request alternative monitoring requirements according to the procedures in this 

paragraph if you meet each of the conditions in paragraphs (gf)(1)(i) through (iii) of this section: 

(i) Your fluid catalytic cracking unit regenerator vent is subject to the PM limit in 40 CFR 

60.102(a)(1) and uses a wet scrubber for PM emissions control; 

(ii) You have alternative monitoring requirements for the continuous opacity monitoring system 

requirement in 40 CFR 60.105(a)(1) approved by the Administrator; and 

(iii) You are required by this subpart to install, operate, and maintain a continuous opacity 

monitoring system for the same catalytic cracking unit regenerator vent for which you have 

approved alternative monitoring requirements. 

(2) You can request approval to use an alternative monitoring method prior to submitting your 

notification of compliance status, in your notification of compliance status, or at any time. 

(3) You must submit a copy of the approved alternative monitoring requirements along with a 

monitoring plan that includes a description of the continuous monitoring system or method, 

including appropriate operating parameters that will be monitored, test results demonstrating 

compliance with the opacity limit used to establish an enforceable operating limit(s), and the 

frequency of measuring and recording to establish continuous compliance. If applicable, you 

must also include operation and maintenance requirements for the continuous monitoring system. 

(4) We will contact you within 30 days of receipt of your application to inform you of approval 

or of our intent to disapprove your request. 

Notifications, Reports, and Records 

§63.1574 What notifications must I submit and when? 

(a) Except as allowed in paragraphs (a)(1) through (3) of this section, you must submit all of the 

notifications in §§63.6(h), 63.7(b) and (c), 63.8(e), 63.8(f)(4), 63.8(f)(6), and 63.9(b) through (h) 

that apply to you by the dates specified. 

(1) You must submit the notification of your intention to construct or reconstruct according to 

§63.9(b)(5) unless construction or reconstruction had commenced and initial startup had not 

occurred before April 11, 2002. In this case, you must submit the notification as soon as 

practicable before startup but no later than July 10, 2002. This deadline also applies to the 
34 

application for approval of construction or reconstruction and approval of construction or 

reconstruction based on State preconstruction review required in §§63.5(d)(1)(i) and 63.5(f)(2). 

(2) You must submit the notification of intent to conduct a performance test required in §63.7(b) 

at least 30 calendar days before the performance test is scheduled to begin (instead of 60 days). 

(3) If you are required to conduct aan initial performance test, performance evaluation, design 

evaluation, opacity observation, visible emission observation, or other initial compliance 

demonstration, you must submit a notification of compliance status according to §63.9(h)(2)(ii). 

You can submit this information in an operating permit application, in an amendment to an 

operating permit application, in a separate submission, or in any combination. In a State with an 

approved operating permit program where delegation of authority under section 112(l) of the 

CAA has not been requested or approved, you must provide a duplicate notification to the 

applicable Regional Administrator. If the required information has been submitted previously, 

you do not have to provide a separate notification of compliance status. Just refer to the earlier 

submissions instead of duplicating and resubmitting the previously submitted information. 

(i) For each initial compliance demonstration that does not include a performance test, you must 

submit the Notification of Compliance Status no later than 30 calendar days following 

completion of the initial compliance demonstration. 

(ii) For each initial compliance demonstration that includes a performance test, you must submit 

the notification of compliance status, including the performance test results, no later than 150 

calendar days after the compliance date specified for your affected source in §63.1563. 

(b) As specified in §63.9(b)(2), if you startup your new affected source before April 11, 2002, 

you must submit the initial notification no later than August 9, 2002. 

(c) If you startup your new or reconstructed affected source on or after April 11, 2002, you must 

submit the initial notification no later than 120 days after you become subject to this subpart. 

(d) You also must include the information in Table 42 of this subpart in your notification of 

compliance status. 

(e) If you request an extension of compliance for an existing catalytic cracking unit as allowed in 

§63.1563(c), you must submit a notification to your permitting authority containing the required 

information by October 13, 2003. 

(f) As required by this subpart, you must prepare and implement an operation, maintenance, and 

monitoring plan for each control system and continuous monitoring system for each affected 

source. The purpose of this plan is to detail the operation, maintenance, and monitoring 

procedures you will follow. 

(1) You must submit the plan to your permitting authority for review and approval along with 

your notification of compliance status. While you do not have to include the entire plan in your 

part 70 or 71 permit, you must include the duty to prepare and implement the plan as an 

applicable requirement in your part 70 or 71 operating permit. You must submit any changes to 
35 

your permitting authority for review and approval and comply with the plan until the change is 

approved. 

(2) Each plan must include, at a minimum, the information specified in paragraphs (f)(2)(i) 

through (xii) of this section. 

(i) Process and control device parameters to be monitored for each affected source, along with 

established operating limits. 

(ii) Procedures for monitoring emissions and process and control device operating parameters for 

each affected source. 

(iii) Procedures that you will use to determine the coke burn-rate, the volumetric flow rate (if you 

use process data rather than direct measurement), and the rate of combustion of liquid or solid 

fossil fuels if you use an incinerator-waste heat boiler to burn the exhaust gases from a catalyst 

regenerator. 

(iv) Procedures and analytical methods you will use to determine the equilibrium catalyst Ni 

concentration, the equilibrium catalyst Ni concentration monthly rolling average, and the hourly 

or hourly average Ni operating value. 

(v) Procedures you will use to determine the pH of the water (or scrubbing liquid) exiting a wet 

scrubber if you use pH strips. 

(vi) Procedures you will use to determine the HCl concentration of gases from a catalytic 

reforming unit when you use a colormetric tube sampling system, including procedures for 

correcting for pressure (if applicable to the sampling equipment) and the sampling locations that 

will be used for compliance monitoring purposes. 

(vii) Procedures you will use to determine the gas flow rate for a catalytic cracking unit if you 

use the alternative procedure based on air flow rate and temperature. 

(viii) Monitoring schedule, including when you will monitor and when you will not monitor an 

affected source (e.g., during the coke burn-off, regeneration process). 

(ix) Quality control plan for each continuous opacity monitoring system and continuous emission 

monitoring system you use to meet an emission limit in this subpart. This plan must include 

procedures you will use for calibrations, accuracy audits, and adjustments to the system needed 

to meet applicable requirements for the system. 

(x) Maintenance schedule for each monitoring system and control device for each affected 

source that is generally consistent with the manufacturer's instructions for routine and long-term 

maintenance. 

(xi) If you use a fixed-bed gas-solid adsorption system to control emissions from a catalytic 

reforming unit, you must implement corrective action procedures if the HCl concentration 

measured at the selected compliance monitoring sampling location within the bed exceeds the 

operating limit. These procedures must require, at minimum, repeat measurement and recording 
36 

of the HCl concentration in the adsorption system exhaust gases and at the selected compliance 

monitoring sampling location within the bed. If the HCl concentration at the selected compliance 

monitoring location within the bed is above the operating limit during the repeat measurement 

while the HCl concentration in the adsorption system exhaust gases remains below the operating 

limit, the adsorption bed must be replaced as soon as practicable. Your procedures must specify 

the sampling frequency that will be used to monitor the HCl concentration in the adsorption 

system exhaust gases subsequent to the repeat measurement and prior to replacement of the 

sorbent material (but not less frequent than once every 4 hours during coke burn-off). If the HCl 

concentration of the adsorption system exhaust gases is above the operating limit when measured 

at any time, the adsorption bed must be replaced within 24 hours or before the next regeneration 

cycle, whichever is longer. 

(xii) Procedures that will be used for purging the catalyst if you do not use a control device to 

comply with the organic HAP emission limits for catalytic reforming units. These procedures 

will include, but are not limited to, specification of the minimum catalyst temperature and the 

minimum cumulative volume of gas per mass of catalyst used for purging prior to uncontrolled 

releases (i.e., during controlled purging events); the maximum purge gas temperature for 

uncontrolled purge events; and specification of the monitoring systems that will be used to 

monitor and record data during each purge event. 

§63.1575 What reports must I submit and when? 

(a) You must submit each report in Table 43 of this subpart that applies to you. 

(b) Unless the Administrator has approved a different schedule, you must submit each report by 

the date in Table 43 of this subpart and according to the requirements in paragraphs (b)(1) 

through (5) of this section. 

(1) The first compliance report must cover the period beginning on the compliance date that is 

specified for your affected source in §63.1563 and ending on June 30 or December 31, 

whichever date is the first date following the end of the first calendar half after the compliance 

date that is specified for your affected source in §63.1563. 

(2) The first compliance report must be postmarked or delivered no later than July 31 or January 

31, whichever date follows the end of the first calendar half after the compliance date that is 

specified for your affected source in §63.1563. 

(3) Each subsequent compliance report must cover the semiannual reporting period from January 

1 through June 30 or the semiannual reporting period from July 1 through December 31. 

(4) Each subsequent compliance report must be postmarked or delivered no later than July 31 or 

January 31, whichever date is the first date following the end of the semiannual reporting period. 

(5) For each affected source that is subject to permitting regulations pursuant to part 70 or 71 of 

this chapter, and if the permitting authority has established dates for submitting semiannual 

reports pursuant to §70.6(a)(3)(iii)(A) or §71.6(a)(3)(iii)(A) of this chapter, you may submit the 
37 

first and subsequent compliance reports according to the dates the permitting authority has 

established instead of according to the dates in paragraphs (b)(1) through (4) of this section. 

(c) The compliance report must contain the information required in paragraphs (c)(1) through (4) 

of this section. 

(1) Company name and address. 

(2) Statement by a responsible official, with that official's name, title, and signature, certifying 

the accuracy of the content of the report. 

(3) Date of report and beginning and ending dates of the reporting period. 

(4) If there are no deviations from any emission limitation that applies to you and there are no 

deviations from the requirements for work practice standards, a statement that there were no 

deviations from the emission limitations or work practice standards during the reporting period 

and that no continuous emission monitoring system or continuous opacity monitoring system 

was inoperative, inactive, malfunctioning, out-of-control, repaired, or adjusted. 

(d) For each deviation from an emission limitation and for each deviation from the requirements 

for work practice standards that occurs at an affected source where you are not using a 

continuous opacity monitoring system or a continuous emission monitoring system to comply 

with the emission limitation or work practice standard in this subpart, the semiannual 

compliance report must contain the information in paragraphs (c)(1) through (3) of this section 

and the information in paragraphs (d)(1) through (34) of this section. 

(1) The total operating time of each affected source during the reporting period and 

identification of the sources for which there was a deviation. 

(2) Information on the number, date, time, duration, and cause of deviations (including unknown 

cause, if applicable), as applicable, and the corrective action taken. 

(3) Information on the number, duration, and cause for monitor downtime incidents (including 

unknown cause, if applicable, other than downtime associated with zero and span and other daily 

calibration checks). 

(4) The applicable operating limit or work practice standard from which you deviated and 

either the parameter monitor reading during the deviation or a description of how you 

deviated from the work practice standard. 

(e) For each deviation from an emission limitation occurring at an affected source where you are 

using a continuous opacity monitoring system or a continuous emission monitoring system to 

comply with the emission limitation, you must include the information in paragraphs (c)(1) 

through (3) of this section, in paragraphs (d)(1) through (3) of this section, and the 

information in paragraphs (e)(1) through (13) of this section. 

(1) [Reserved]The date and time that each malfunction started and stopped.
38 

(2) The date and time that each continuous opacity monitoring system or continuous emission 

monitoring system was inoperative, except for zero (low-level) and high-level checks. 

(3) The date and time that each continuous opacity monitoring system or continuous emission 

monitoring system was out-of-control, including the information in §63.8(c)(8). 

(4) An estimate of the quantity of each regulated pollutant emitted over the emission limit 

during the deviation, and a description of the method used to estimate the emissions.The 

date and time that each deviation started and stopped, and whether each deviation occurred 

during a period of startup, shutdown, or malfunction or during another period.

(5) A summary of the total duration of the deviation during the reporting period (recorded in 

minutes for opacity and hours for gases and in the averaging period specified in the regulation 

for other types of emission limitations), and the total duration as a percent of the total source 

operating time during that reporting period. 

(6) A breakdown of the total duration of the deviations during the reporting period and into those 

that are due to startup, shutdown, control equipment problems, process problems, other known 

causes, and other unknown causes. 

(7) A summary of the total duration of downtime for the continuous opacity monitoring system 

or continuous emission monitoring system during the reporting period (recorded in minutes for 

opacity and hours for gases and in the averaging time specified in the regulation for other types 

of standards), and the total duration of downtime for the continuous opacity monitoring system 

or continuous emission monitoring system as a percent of the total source operating time during 

that reporting period. 

(8) A breakdown of the total duration of downtime for the continuous opacity monitoring system 

or continuous emission monitoring system during the reporting period into periods that are due to 

monitoring equipment malfunctions, non-monitoring equipment malfunctions, quality 

assurance/quality control calibrations, other known causes, and other unknown causes. 

(9) An identification of each HAP that was monitored at the affected source. 

(10) A brief description of the process units. 

(11) The monitoring equipment manufacturer(s) and model number(s). 

(12) The date of the latest certification or audit for the continuous opacity monitoring system or 

continuous emission monitoring system. 

(13) A description of any change in the continuous emission monitoring system or continuous 

opacity monitoring system, processes, or controls since the last reporting period. 

(f) You also must include the information required in paragraphs (f)(1) through (2) of this section 

in each compliance report, if applicable. 
39 

(1) You must include the information in paragraph (c)(1)(i) or (c)(1)(ii) of this section, if 

applicable. 

(i) If you are complying with paragraph (k)(1) of this section, a summary of the results of 

any performance test done during the reporting period on any affected unit. Results of the 

performance test include the identification of the source tested, the date of the test, the 

percentage of emissions reduction or outlet pollutant concentration reduction (whichever is 

needed to determine compliance) for each run and for the average of all runs, and the 

values of the monitored operating parameters. 

(ii) If you are not complying with paragraph (k)(1) of this section, aA copy of any 

performance test done during the reporting period on any affected unit. The report may be 

included in the next semiannual compliance report. The copy must include a complete report for 

each test method used for a particular kind of emission point tested. For additional tests 

performed for a similar emission point using the same method, you must submit the results and 

any other information required, but a complete test report is not required. A complete test report 

contains a brief process description; a simplified flow diagram showing affected processes, 

control equipment, and sampling point locations; sampling site data; description of sampling and 

analysis procedures and any modifications to standard procedures; quality assurance procedures; 

record of operating conditions during the test; record of preparation of standards; record of 

calibrations; raw data sheets for field sampling; raw data sheets for field and laboratory analyses; 

documentation of calculations; and any other information required by the test method. 

(2) Any requested change in the applicability of an emission standard (e.g., you want to change 

from the PM standard to the Ni standard for catalytic cracking units or from the HCl 

concentration standard to percent reduction for catalytic reforming units) in your 

periodiccompliance report. You must include all information and data necessary to demonstrate 

compliance with the new emission standard selected and any other associated requirements. 

(g) You may submit reports required by other regulations in place of or as part of the compliance 

report if they contain the required information. 

(h) [Reserved]The reporting requirements in paragraphs (h)(1) and (2) of this section apply to 

startups, shutdowns, and malfunctions: 

(1) When actions taken to respond are consistent with the plan, you are not required to report 

these events in the semiannual compliance report and the reporting requirements in 

§§63.6(e)(3)(iii) and 63.10(d)(5) do not apply. 

(2) When actions taken to respond are not consistent with the plan, you must report these events 

and the response taken in the semiannual compliance report. In this case, the reporting 

requirements in §§63.6(e)(3)(iv) and 63.10(d)(5) do not apply.

(i) If the applicable permitting authority has approved a period of planned maintenance for your 

catalytic cracking unit according to the requirements in paragraph (j) of this section, you must 

include the following information in your compliance report. 
40 

(1) In the compliance report due for the 6-month period before the routine planned maintenance 

is to begin, you must include a full copy of your written request to the applicable permitting 

authority and written approval received from the applicable permitting authority. 

(2) In the compliance report due after the routine planned maintenance is complete, you must 

include a description of the planned routine maintenance that was performed for the control 

device during the previous 6-month period, and the total number of hours during those 6 months 

that the control device did not meet the emission limitations and monitoring requirements as a 

result of the approved routine planned maintenance. 

(j) If you own or operate multiple catalytic cracking units that are served by a single wet 

scrubber emission control device (e.g., a Venturi scrubber), you may request the applicable 

permitting authority to approve a period of planned routine maintenance for the control device 

needed to meet requirements in your operation, maintenance, and monitoring plan. You must 

present data to the applicable permitting authority demonstrating that the period of planned 

maintenance results in overall emissions reductions. During this pre-approved time period, the 

emission control device may be taken out of service while maintenance is performed on the 

control device and/or one of the process units while the remaining process unit(s) continue to 

operate. During the period the emission control device is unable to operate, the emission limits, 

operating limits, and monitoring requirements applicable to the unit that is operating and the wet 

scrubber emission control device do not apply. The applicable permitting authority may require 

that you take specified actions to minimize emissions during the period of planned maintenance. 

(1) You must submit a written request to the applicable permitting authority at least 6 months 

before the planned maintenance is scheduled to begin with a copy to the EPA Regional 

Administrator. 

(2) Your written request must contain the information in paragraphs (j)(2)(i) through (v) of this 

section. 

(i) A description of the planned routine maintenance to be performed during the next 6 months 

and why it is necessary. 

(ii) The date the planned maintenance will begin and end. 

(iii) A quantified estimate of the HAP and criteria pollutant emissions that will be emitted during 

the period of planned maintenance. 

(iv) An analysis showing the emissions reductions resulting from the planned maintenance as 

opposed to delaying the maintenance until the next unit turnaround. 

(v) Actions you will take to minimize emissions during the period of planned maintenance. 

(k) Electronic submittal of performance test and CEMS performance evaluation data. On and 

after [THE DATE 3 YEARS AFTER DATE OF PUBLICATION OF THE FINAL RULE 

AMENDMENTS IN THE FEDERAL REGISTER] , if required to submit the results of a 

performance test or CEMS performance evaluation, you must submit the results using 
41 

EPA’s Electronic Reporting Tool (ERT) according to the procedures in paragraphs (k)(1) 

and (2) of this section. 

(1) Within 60 days after the date of completing each performance test as required by this 

subpart, you must submit the results of the performance tests according to the method 

specified by either paragraph (k)(1)(i) or (k)(1)(ii) of this section. 

(i) For data collected using test methods supported by the EPA’s ERT as listed on the 

EPA’s ERT website (http://www.epa.gov/ttn/chief/ert/index.html), you must submit the 

results of the performance test to the Compliance and Emissions Data Reporting Interface 

(CEDRI) accessed through the EPA’s Central Data Exchange (CDX) 

(http://cdx.epa.gov/epa_home.asp), unless the Administrator approves another approach. 

Performance test data must be submitted in a file format generated through use of the 

EPA’s ERT. If you claim that some of the performance test information being submitted is 

confidential business information (CBI), you must submit a complete file generated 

through the use of the EPA’s ERT, including information claimed to be CBI, on a compact 

disc or other commonly used electronic storage media (including, but not limited to, flash 

drives) by registered letter to the EPA. The electronic media must be clearly marked as 

CBI and mailed to U.S. EPA/OAQPS/CORE CBI Office, Attention: WebFIRE 

Administrator, MD C404-02, 4930 Old Page Rd., Durham, NC 27703. The same ERT file 

with the CBI omitted must be submitted to the EPA via CDX as described earlier in this 

paragraph. 

(ii) For data collected using test methods that are not supported by the EPA’s ERT as listed 

on the EPA’s ERT website, you must submit the results of the performance test to the 

Administrator at the appropriate address listed in §63.13. 

(2) Within 60 days after the date of completing each CEMS performance evaluation test 

required by §63.1571(a) and (b), you must submit the results of the performance evaluation 

according to the method specified by either paragraph (k)(2)(i) or (k)(2)(ii) of this section. 

(i) For data collection of relative accuracy test audit (RATA) pollutants that are supported 

by the EPA’s ERT as listed on the ERT website, the owner or operator must submit the 

results of the performance evaluation to the CEDRI that is accessed through the EPA’s 

CDX, unless the Administrator approves another approach. Performance evaluation data 

must be submitted in a file format generated through the use of the EPA’s ERT. If an 

owner or operator claims that some of the performance evaluation information being 

submitted is CBI, the owner or operator must submit a complete file generated through the 

use of the EPA’s ERT, including information claimed to be CBI, on a compact disc or other 

commonly used electronic storage media (including, but not limited to, flash drives) by 

registered letter to the EPA. The electronic media must be clearly marked as CBI and 

mailed to U.S. EPA/OAQPS/CORE CBI Office, Attention: WebFIRE Administrator, MD 

C404-02, 4930 Old Page Rd., Durham, NC 27703. The same ERT file with the CBI 

omitted must be submitted to the EPA via CDX as described earlier in this paragraph. 
42 

(ii) For any performance evaluation data with RATA pollutants that are not supported by 

the EPA’s ERT as listed on the EPA’s ERT website, you must submit the results of the 

performance evaluation to the Administrator at the appropriate address listed in §63.13. 

§63.1576 What records must I keep, in what form, and for how long? 

(a) You must keep the records specified in paragraphs (a)(1) through (3) of this section. 

(1) A copy of each notification and report that you submitted to comply with this subpart, 

including all documentation supporting any initial notification or Notification of Compliance 

Status that you submitted, according to the requirements in §63.10(b)(2)(xiv). 

(2) The records specified in §63.6(e)(3)(iii) paragraphs (a)(2)(i) through (v) related to iv) of 

this section. 

(i) Record the date, time, and duration of each startup, and/or shutdown, and malfunction

period, recording the periods when the affected source was subject to the standard 

applicable to startup and shutdown. 

(ii) In the event that an affected unit fails to meet an applicable standard, record the 

number of failures. For each failure record the date, time and duration of each failure. 

(iii) For each failure to meet an applicable standard, record and retain a list of the affected 

sources or equipment, an estimate of the volume of each regulated pollutant emitted over 

any emission limit and a description of the method used to estimate the emissions. 

(iv) Record actions taken to minimize emissions in accordance with §63.1570(c) and any 

corrective actions taken to return the affected unit to its normal or usual manner of 

operation. 

(3) Records of performance tests, performance evaluations, and opacity and visible emission 

observations as required in §63.10(b)(2)(viii). 

(b) For each continuous emission monitoring system and continuous opacity monitoring system, 

you must keep the records required in paragraphs (b)(1) through (5) of this section. 

(1) Records described in §63.10(b)(2)(vi) through (xi). 

(2) Monitoring data for continuous opacity monitoring systems during a performance evaluation 

as required in §63.6(h)(7)(i) and (ii). 

(3) The performance evaluation plan as described in §63.8(d)(2) for the life of the affected 

source or until the affected source is no longer subject to the provisions of this part, to be 

made available for inspection, upon request, by the Administrator. If the performance 

evaluation plan is revised, you must keep previous (i.e., superseded) versions of the 

performance evaluation plan on record to be made available for inspection, upon request, 
43 

by the Administrator, for a period of 5 years after each revision to the plan. The program 

of corrective action should be included in the plan required under §63.8(d)(2)Previous (i.e., 

superceded) versions of the performance evaluation plan as required in §63.8(d)(3). 

(4) Requests for alternatives to the relative accuracy test for continuous emission monitoring 

systems as required in §63.8(f)(6)(i). 

(5) Records of the date and time that each deviation started and stopped, and whether the 

deviation occurred during a period of startup, shutdown, or malfunction or during another period. 

(c) You must keep the records in §63.6(h) for visible emission observations. 

(d) You must keep records required by Tables 6, 7, 13, and 14 of this subpart (for catalytic 

cracking units); Tables 20, 21, 27 and 28 of this subpart (for catalytic reforming units); Tables 34 

and 35 of this subpart (for sulfur recovery units); and Table 39 of this subpart (for bypass lines) 

to show continuous compliance with each emission limitation that applies to you. 

(e) You must keep a current copy of your operation, maintenance, and monitoring plan onsite 

and available for inspection. You also must keep records to show continuous compliance with 

the procedures in your operation, maintenance, and monitoring plan. 

(f) You also must keep the records of any changes that affect emission control system 

performance including, but not limited to, the location at which the vent stream is introduced into 

the flame zone for a boiler or process heater. 

(g) Your records must be in a form suitable and readily available for expeditious review 

according to §63.10(b)(1). 

(h) As specified in §63.10(b)(1), you must keep each record for 5 years following the date of 

each occurrence, measurement, maintenance, corrective action, report, or record. 

(i) You must keep each record on site for at least 2 years after the date of each occurrence, 

measurement, maintenance, corrective action, report, or record, according to §63.10(b)(1). You 

can keep the records offsite for the remaining 3 years. 

Other Requirements and Information 

§63.1577 What parts of the General Provisions apply to me? 

Table 44 of this subpart shows which parts of the General Provisions in §§63.1 through 63.15 

apply to you. 
44 

§63.1578 Who implements and enforces this subpart? 

(a) This subpart can be implemented and enforced by us, the U.S. EPA, or a delegated authority 

such as your State, local, or tribal agency. If the U.S. EPA Administrator has delegated authority 

to your State, local, or tribal agency, then that Agency has the authority to implement and 

enforce this subpart. You should contact your U.S. EPA Regional Office to find out if this 

subpart is delegated to your State, local, or tribal agency. 

(b) In delegating implementation and enforcement authority of this subpart to a State, local, or 

tribal agency under 40 CFR part 63, subpart E, the authorities contained in paragraph (c) of this 

section are retained by the Administrator of the U.S. EPA and are not transferred to the State, 

local, or tribal agency. 

(c) The authorities that will not be delegated to State, local, or tribal agencies are listed in 

paragraphs (c)(1) through (5) of this section. 

(1) Approval of alternatives to the non-opacity emission limitations and work practice standards 

in §§63.1564 through 63.1569 under §63.6(g). 

(2) Approval of alternative opacity emission limitations in §§63.1564 through 63.1569 under 

§63.6(h)(9). 

(3) Approval of major alternatives to test methods under §63.7(e)(2)(ii) and (f) and as defined in 

§63.90. 

(4) Approval of major alternatives to monitoring under §63.8(f) and as defined in §63.90. 

(5) Approval of major alternatives to recordkeeping and reporting under §63.10(f) and as defined 

in §63.90. 

§63.1579 What definitions apply to this subpart? 

Terms used in this subpart are defined in the Clean Air Act (CAA), in 40 CFR 63.2, the General 

Provisions of this part (§§63.1 through 63.15), and in this section as listed. If the same term is 

defined in subpart A and in this section, it shall have the meaning given in this section for 

purposes of this subpart. 

Boiler means any enclosed combustion device that extracts useful energy in the form of steam 

and is not an incinerator. 

Catalytic cracking unit means a refinery process unit in which petroleum derivatives are 

continuously charged; hydrocarbon molecules in the presence of a catalyst suspended in a 

fluidized bed are fractured into smaller molecules, or react with a contact material suspended in a 

fluidized bed to improve feedstock quality for additional processing; and the catalyst or contact 

material is continuously regenerated by burning off coke and other deposits. The unit includes, 

but is not limited to, the riser, reactor, regenerator, air blowers, spent catalyst or contact material 
45 

stripper, catalyst or contact material recovery equipment, and regenerator equipment for 

controlling air pollutant emissions and equipment used for heat recovery. 

Catalytic cracking unit catalyst regenerator means one or more regenerators (multiple 

regenerators) which comprise that portion of the catalytic cracking unit in which coke burn-off 

and catalyst or contact material regeneration occurs and includes the regenerator combustion air 

blower(s). 

Catalytic reforming unit means a refinery process unit that reforms or changes the chemical 

structure of naphtha into higher octane aromatics through the use of a metal catalyst and 

chemical reactions that include dehydrogenation, isomerization, and hydrogenolysis. The 

catalytic reforming unit includes the reactor, regenerator (if separate), separators, catalyst 

isolation and transport vessels (e.g., lock and lift hoppers), recirculation equipment, scrubbers, 

and other ancillary equipment. 

Catalytic reforming unit regenerator means one or more regenerators which comprise that 

portion of the catalytic reforming unit and ancillary equipment in which the following 

regeneration steps typically are performed: depressurization, purge, coke burn-off, catalyst 

rejuvenation with a chloride (or other halogenated) compound(s), and a final purge. The catalytic 

reforming unit catalyst regeneration process can be done either as a semi-regenerative, cyclic, or 

continuous regeneration process. 

Coke burn-off means the coke removed from the surface of the catalytic cracking unit catalyst or 

the catalytic reforming unit catalyst by combustion in the catalyst regenerator. The rate of coke 

burn-off is calculated using Equation 2 in §63.1564. 

Combustion device means an individual unit of equipment such as a flare, incinerator, process 

heater, or boiler used for the destruction of organic HAP or VOC. 

Combustion zone means the space in an enclosed combustion device (e.g., vapor incinerator, 

boiler, furnace, or process heater) occupied by the organic HAP and any supplemental fuel while 

burning. The combustion zone includes any flame that is visible or luminous as well as that 

space outside the flame envelope in which the organic HAP continues to be oxidized to form the 

combustion products. 

Contact material means any substance formulated to remove metals, sulfur, nitrogen, or any 

other contaminants from petroleum derivatives. 

Continuous regeneration reforming means a catalytic reforming process characterized by 

continuous flow of catalyst material through a reactor where it mixes with feedstock, and a 

portion of the catalyst is continuously removed and sent to a special regenerator where it is 

regenerated and continuously recycled back to the reactor. 

Control device means any equipment used for recovering, removing, or oxidizing HAP in either 

gaseous or solid form. Such equipment includes, but is not limited to, condensers, scrubbers, 

electrostatic precipitators, incinerators, flares, boilers, and process heaters. 
46 

Cyclic regeneration reforming means a catalytic reforming process characterized by continual 

batch regeneration of catalyst in situ in any one of several reactors (e.g., 4 or 5 separate reactors) 

that can be isolated from and returned to the reforming operation while maintaining continuous 

reforming process operations (i.e., feedstock continues flowing through the remaining reactors 

without change in feed rate or product octane). 

Deviation means any instance in which an affected source subject to this subpart, or an owner or 

operator of such a source: 

(1) Fails to meet any requirement or obligation established by this subpart, including but not 

limited to any emission limit, operating limit, or work practice standard; or

(2) Fails to meet any term or condition that is adopted to implement an applicable requirement in 

this subpart and that is included in the operating permit for any affected source required to obtain 

such a permit.; or 

(3) Fails to meet any emission limit, operating limit, or work practice standard in this subpart 

during startup, shutdown, or malfunction, regardless of whether or not such failure is permitted 

by this subpart.

Emission limitation means any emission limit, opacity limit, operating limit, or visible emission 

limit. 

Flame zone means the portion of a combustion chamber of a boiler or process heater occupied by 

the flame envelope created by the primary fuel. 

Flow indicator means a device that indicates whether gas is flowing, or whether the valve 

position would allow gas to flow, in or through a line. 

Fuel gas system means the offsite and onsite piping and control system that gathers gaseous 

streams generated by the source, may blend them with sources of gas, if available, and transports 

the blended gaseous fuel at suitable pressures for use as fuel in heaters, furnaces, boilers, 

incinerators, gas turbines, and other combustion devices located within or outside of the refinery. 

The fuel is piped directly to each individual combustion device, and the system typically 

operates at pressures over atmospheric. The gaseous streams can contain a mixture of methane, 

light hydrocarbons, hydrogen, and other miscellaneous species. 

HCl means for the purposes of this subpart, gaseous emissions of hydrogen chloride that serve as 

a surrogate measure for total emissions of hydrogen chloride and chlorine as measured by 

Method 26 or 26A in appendix A to part 60 of this chapter or an approved alternative method. 

Incinerator means an enclosed combustion device that is used for destroying organic 

compounds, with or without heat recovery. Auxiliary fuel may be used to heat waste gas to 

combustion temperatures. An incinerator may use a catalytic combustion process where a 

substance is introduced into an exhaust stream to burn or oxidize contaminants while the 

substances itself remains intact, or a thermal process which uses elevated temperatures as a 

primary means to burn or oxidize contaminants. 
47 

Internal scrubbing system means a wet scrubbing, wet injection, or caustic injection control 

device that treats (in-situ) the catalytic reforming unit recirculating coke burn exhaust gases for 

acid (HCl) control during reforming catalyst regeneration upstream of the atmospheric coke burn 

vent. 

Ni means, for the purposes of this subpart, particulate emissions of nickel that serve as a 

surrogate measure for total emissions of metal HAP, including but not limited to: antimony, 

arsenic, beryllium, cadmium, chromium, cobalt, lead, manganese, nickel, and selenium as 

measured by Method 29 in appendix A to part 60 of this chapter or by an approved alternative 

method. 

Nonmethane TOC means, for the purposes of this subpart, emissions of total organic compounds, 

excluding methane, that serve as a surrogate measure of the total emissions of organic HAP 

compounds including, but not limited to, acetaldehyde, benzene, hexane, phenol, toluene, and 

xylenes and nonHAP VOC as measured by Method 25 in appendix A to part 60 of this chapter, 

by the combination of Methods 18 and 25A in appendix A to part 60 of this chapter, or by an 

approved alternative method. 

Oxidation control system means an emission control system which reduces emissions from sulfur 

recovery units by converting these emissions to sulfur dioxide. 

PM means, for the purposes of this subpart, emissions of particulate matter that serve as a 

surrogate measure of the total emissions of particulate matter and metal HAP contained in the 

particulate matter, including but not limited to: antimony, arsenic, beryllium, cadmium, 

chromium, cobalt, lead, manganese, nickel, and selenium as measured by Methods 5, 5B or 5F in 

aAppendix A-3 to part 60 of this chapter or by an approved alternative method. 

Process heater means an enclosed combustion device that primarily transfers heat liberated by 

burning fuel directly to process streams or to heat transfer liquids other than water. 

Process vent means, for the purposes of this subpart, a gas stream that is continuously or 

periodically discharged during normal operation of a catalytic cracking unit, catalytic reforming 

unit, or sulfur recovery unit, including gas streams that are discharged directly to the atmosphere, 

gas streams that are routed to a control device prior to discharge to the atmosphere, or gas 

streams that are diverted through a product recovery device line prior to control or discharge to 

the atmosphere. 

Reduced sulfur compounds means hydrogen sulfide, carbonyl sulfide, and carbon disulfide. 

Reduction control system means an emission control system which reduces emissions from sulfur 

recovery units by converting these emissions to hydrogen sulfide. 

Responsible official means responsible official as defined in 40 CFR 70.2. 

Semi-regenerative reforming means a catalytic reforming process characterized by shutdown of 

the entire reforming unit (e.g., which may employ three to four separate reactors) at specified 

intervals or at the owner's or operator's convenience for in situ catalyst regeneration. 
48 

Sulfur recovery unit means a process unit that recovers elemental sulfur from gases that contain 

reduced sulfur compounds and other pollutants, usually by a vapor-phase catalytic reaction of 

sulfur dioxide and hydrogen sulfide. This definition does not include a unit where the modified 

reaction is carried out in a water solution which contains a metal ion capable of oxidizing the 

sulfide ion to sulfur, e.g., the LO-CAT II process. 

TOC means, for the purposes of this subpart, emissions of total organic compounds that serve as 

a surrogate measure of the total emissions of organic HAP compounds including, but not limited 

to, acetaldehyde, benzene, hexane, phenol, toluene, and xylenes and nonHAP VOC as measured 

by Method 25A in appendix A to part 60 of this chapter or by an approved alternative method. 

TRS means, for the purposes of this subpart, emissions of total reduced sulfur compounds, 

expressed as an equivalent sulfur dioxide concentration, that serve as a surrogate measure of the 

total emissions of sulfide HAP carbonyl sulfide and carbon disulfide as measured by Method 15 

in appendix A to part 60 of this chapter or by an approved alternative method. 

Work practice standard means any design, equipment, work practice, or operational standard, or 

combination thereof, that is promulgated pursuant to section 112(h) of the CAA. 

Table 1 to Subpart UUU of Part 63—Metal HAP Emission Limits for Catalytic Cracking 

Units 

As stated in §63.1564(a)(1), you shall meet each emission limitation in the following table that 

applies to you. 

For each new or existing 

catalytic cracking unit . . . 

You shall meet the following emission limits for each 

catalyst regenerator vent . . . 

1. Subject to new source 

performance standard (NSPS) 

for PM in 40 CFR 60.102 

PM emissions must not the exceed 1.0 gram per kilogram 

(g/kg) per 1,000 kg (1.0 lb/1,000 lb) of coke burn-off in the 

catalyst regenerator;. Before [THE DATE 18 MONTHS 

AFTER THE DATE OF PUBLICATION OF THE FINAL 

RULE AMENDMENTS IN THE FEDERAL REGISTER],

if the discharged gases pass through an incinerator or waste 

heat boiler in which you burn auxiliary or in supplemental 

liquid or solid fossil fuel, the incremental rate of PM emissions 

must not exceed 43.0 grams per Gigajoule (g/GJ) or 0.10 

pounds per million British thermal units (lb/million Btu) of 

heat input attributable to the liquid or solid fossil fuel; and the 

opacity of emissions must not exceed 30 percent, except for 

one 6-minute average opacity reading in any 1-hour period. 

2. Subject to NSPS for PM in 

40 CFR 60.102a(b)(1)(i) 

PM emissions must not exceed 1.0 g/kg (1.0 lb PM/1,000 lb) 

of coke burn-off or, if a PM CEMS is used, 0.040 grain per 

dry standard cubic feet (gr/dscf) corrected to 0 percent 

excess air. 
49 

For each new or existing 

catalytic cracking unit . . . 

You shall meet the following emission limits for each 

catalyst regenerator vent . . . 

3. Subject to NSPS for PM in 

40 CFR 60.102a(b)(1)(ii) 

PM emissions must not exceed 0.5 g/kg coke burn-off (0.5 

lb/1000 lb coke burn-off) or, if a PM CEMS is used, 0.020 

gr/dscf corrected to 0 percent excess air. 

24. Option 1: NSPS 

requirementsPM per coke 

burn-off limit, not subject to the 

NSPS for PM in 40 CFR 60.102

or in 40 CFR 60.102a(b)(1)

PM emissions must not exceed 1.0 kg/1,000 kg (1.0 lb/1,000 

lb) of coke burn-off in the catalyst regenerator; if the 

discharged gases pass through an incinerator or waste heat 

boiler in which you burn auxiliary or supplemental liquid or 

solid fossil fuel, the incremental rate of PM must not exceed 

43.0 g/GJ (0.10 lb/million Btu) of heat input attributable to the 

liquid or solid fossil fuel; and the opacity of emissions must 

not exceed 30 percent, except for one 6-minute average 

opacity reading in any 1-hour period.PM emissions must not 

exceed the limits specified in Item 1 of this table.

35. Option 2: PM concentration 

limit, not subject to the NSPS 

for PM in 40 CFR 60.102 or in 

40 CFR 60.102a(b)(1)

PM emissions must not exceed 0.040 gr/dscf corrected to 0 

percent excess air1.0 kg/1,000 kg (1.0 lb/1,000 lbs) of coke 

burn-off in the catalyst regenerator. 

46. Option 3: Ni lb/hr limit, not 

subject to the NSPS for PM in 

40 CFR 60.102 or in 40 CFR 

60.102a(b)(1)

Nickel (Ni) emissions must not exceed 13,000 milligrams per 

hour (mg/hr) (0.029 lb/hr). 

57. Option 4: Ni Lb/1,000 lbs 

ofper coke burn-off limit, not 

subject to the NSPS for PM in 

40 CFR 60.102 or in 40 CFR 

60.102a(b)(1)

Ni emissions must not exceed 1.0 mg/kg (0.001 lb/1,000 lbs) 

of coke burn-off in the catalyst regenerator. 

Table 2 to Subpart UUU of Part 63—Operating Limits for Metal HAP Emissions From 

Catalytic Cracking Units 

As stated in §63.1564(a)(2), you shall meet each operating limit in the following table that 

applies to you. 
50 

For each new or 

existing catalytic 

cracking unit . . . 

For this type of 

continuous 

monitoring system 

. . . 

For this type of 

control device . . . 

You shall meet this 

operating limit . . . 

1. Subject to the 

NSPS for PM in 

40 CFR 60.102.

a. Continuous opacity 

monitoring system.

used to comply with 

the 30 percent 

opacity limit in 

40 CFR 60.102 

before [THE DATE 

18 MONTHS 

AFTER THE DATE 

OF PUBLICATION 

OF THE FINAL 

RULE 

AMENDMENTS IN 

THE FEDERAL 

REGISTER].

Not applicable Not applicable. 

2. Option 1: NSPS 

requirements not 

subject to the 

NSPS for PM in 

40 CFR 60.102. 

Continuous opacity 

monitoring system. 

Not applicable Not applicable.

3. Option 2: PM 

limit not subject to 

the NSPS for PM 

in 40 CFR 60.102.

ab. Continuous 

opacity monitoring 

system. used to 

comply with a sitespecific opacity limit

ElectrostaticCyclone, 

fabric filter, or 

electrostatic

precipitator 

Maintain the hourly3-hour 

rolling average opacity of 

emissions from your catalyst 

regenerator vent no higher 

than the site-specific opacity 

limit established during the 

performance test. 

bc. Continuous 

parameter monitoring 

systems. 

Electrostatic 

precipitator 

Maintain the daily average 

gas coke burn-off rate or 

daily average flow rate no 

higher than the limit 

established in the 

performance test; and 

maintain the daily3-hour 

rolling average voltagetotal 

power and secondary current 

(or total power input) above 

the limit established in the 

performance test. 
51 

For each new or 

existing catalytic 

cracking unit . . . 

For this type of 

continuous 

monitoring system 

. . . 

For this type of 

control device . . . 

You shall meet this 

operating limit . . . 

cd. Continuous 

parameter monitoring 

systems. 

Wet scrubber Maintain the daily3-hour 

rolling average pressure drop 

above the limit established in 

the performance test (not 

applicable to a wet scrubber 

of the non-venturi jet-ejector 

design);; and maintain the 

daily3-hour rolling average 

liquid-to-gas ratio above the 

limit established in the 

performance test. 

e. Bag leak detection 

(BLD) system 

Fabric filter Maintain particulate 

loading below the BLD 

alarm set point established 

in the initial adjustment of 

the BLD system or 

allowable seasonal 

adjustments. 

2. Subject to 

NSPS for PM in 

40 CFR 

60.102a(b)(1)(i) 

a. PM CEMS Not applicable Not applicable. 

b. Continuous 

opacity monitoring 

system used to 

comply with a sitespecific opacity limit 

Cyclone or 

electrostatic 

precipitator 

Maintain the 3-hour rolling 

average opacity of 

emissions from your 

catalyst regenerator vent 

no higher than the sitespecific opacity limit 

established during the 

performance test. 

c. Continuous 

parameter 

monitoring systems 

Electrostatic 

precipitator

Maintain the daily average 

coke burn-off rate or daily 

average flow rate no higher 

than the limit established in 

the performance test; and 

maintain the 3-hour rolling 

average total power and 

secondary current above 

the limit established in the 

performance test. 
52 

For each new or 

existing catalytic 

cracking unit . . . 

For this type of 

continuous 

monitoring system 

. . . 

For this type of 

control device . . . 

You shall meet this 

operating limit . . . 

d. Continuous 

parameter 

monitoring systems 

Wet scrubber Maintain the 3-hour rolling 

average pressure drop 

above the limit established 

in the performance test; 

and maintain the 3-hour 

rolling average liquid-togas ratio above the limit 

established in the 

performance test. 

e. Bag leak detection 

(BLD) system 

Fabric filter Maintain particulate 

loading below the BLD 

alarm set point established 

in the initial adjustment of 

the BLD system or 

allowable seasonal 

adjustments. 

3. Subject to 

NSPS for PM in 

40 CFR 

60.102a(b)(1)(ii) 

Any Any The applicable operating 

limits in Item 2 of this 

table. 

4. Option 3: Ni 

lb/hr1: PM per 

coke burn-off 

limit not subject to 

the NSPS for PM 

in 40 CFR 60.102.

or 40 CFR 

60.102a(b)(1)

a. Continuous opacity 

monitoring system.

used to comply with 

a site-specific opacity 

limit

ElectrostaticCyclone, 

fabric filter, or 

electrostatic

precipitator 

Maintain the daily3-hour 

rolling average Ni operating 

valueopacity of emissions 

from your catalyst 

regenerator vent no higher 

than the site-specific opacity 

limit established during the 

performance test.

Alternatively, before [THE 

DATE 18 MONTHS 

AFTER THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

you may maintain the 

hourly average opacity of 

emissions from your 

catalyst generator vent no 

higher than the site-specific 

opacity limit established 
53 

For each new or 

existing catalytic 

cracking unit . . . 

For this type of 

continuous 

monitoring system 

. . . 

For this type of 

control device . . . 

You shall meet this 

operating limit . . . 

during the performance 

test.

b. Continuous 

parameter 

monitoring systems 

i. Electrostatic 

precipitator 

(1) Maintain the daily 

average gas flow rate or 

daily average coke burn-off 

rate no higher than the 

limit established in the 

performance test. 

(2) Maintain the 3-hour 

rolling average total power 

and secondary current 

above the limit established 

in the performance test. 

Alternatively, before [THE 

DATE 18 MONTHS 

AFTER THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

you may maintain the daily 

average voltage and 

secondary current (or total 

power input) above the 

limit established in the 

performance test. 

ii. Wet scrubber (1) Maintain the 3-hour 

rolling average pressure 

drop above the limit 

established in the 

performance test. 

Alternatively, before [THE 

DATE 18 MONTHS 

AFTER THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

you may maintain the daily 

average pressure drop 

above the limit established 
54 

For each new or 

existing catalytic 

cracking unit . . . 

For this type of 

continuous 

monitoring system 

. . . 

For this type of 

control device . . . 

You shall meet this 

operating limit . . . 

in the performance test (not 

applicable to a wet 

scrubber of the non-venturi 

jet-ejector design). 

(2) Maintain the 3-hour 

rolling average liquid-togas ratio above the limit 

established in the 

performance test. 

Alternatively, before [THE 

DATE 18 MONTHS 

AFTER THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

you may maintain the daily 

average liquid-to-gas ratio 

above the limit established 

in the performance test. 

c. Bag leak detection 

(BLD) system 

Fabric filter Maintain particulate 

loading below the BLD 

alarm set point established 

in the initial adjustment of 

the BLD system or 

allowable seasonal 

adjustments. 

5. Option 2: PM 

concentration 

limit not subject 

to the NSPS for 

PM in 40 CFR 

60.102 or 40 CFR 

60.102a(b)(1) 

PM CEMS Any Not applicable.

6. Option 3: Ni 

lb/hr limit not 

subject to the 

NSPS for PM in 

40 CFR 60.102

ba. Continuous 

parameteropacity

monitoring systems.

Cyclone, fabric 

filter, or 

electrostatici. 

Electrostatic

precipitator 

Maintain the daily3-hour 

rolling average gas flow 

rateNi operating value no 

higher than the limit 

established during the 

performance test;. 

Alternatively, before [THE 
55 

For each new or 

existing catalytic 

cracking unit . . . 

For this type of 

continuous 

monitoring system 

. . . 

For this type of 

control device . . . 

You shall meet this 

operating limit . . . 

DATE 18 MONTHS 

AFTER THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

you may maintain the 

monthly rollingdaily average 

of the equilibrium catalyst Ni 

concentrationoperating 

value no higher than the limit 

established during the 

performance test; and 

maintain the daily average 

voltage and secondary 

current (or total power input) 

above the established during 

the performance test. 

b. Continuous 

parameter 

monitoring systems 

i. Electrostatic

precipitator 

(1) Maintain the daily 

average gas flow rate or 

daily average coke burn-off 

rate no higher than the 

limit established during the 

performance test. 

(2) Maintain the monthly 

rolling average of the 

equilibrium catalyst Ni 

concentration no higher 

than the limit established 

during the performance 

test. 

(3) Maintain the 3-hour 

rolling average total power 

and secondary current 

above the limit established 

in the performance test. 

Alternatively, before [THE 

DATE 18 MONTHS 

AFTER THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 
56 

For each new or 

existing catalytic 

cracking unit . . . 

For this type of 

continuous 

monitoring system 

. . . 

For this type of 

control device . . . 

You shall meet this 

operating limit . . . 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

you may maintain the daily 

average voltage and 

secondary current (or total 

power input) above the 

established during the 

performance test. 

ii. Wet scrubber (1) Maintain the monthly 

rolling average of the 

equilibrium catalyst Ni 

concentration no higher 

than the limit established 

during the performance 

test. 

 ii. Wet scrubber (2) Maintain the monthly3-

hour rolling average of the 

equilibrium catalyst Ni 

concentration no higher 

thanpressure drop above the 

limit established during the 

performance test;. 

Alternatively, before [THE 

DATE 18 MONTHS 

AFTER THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

you may maintain the daily 

average pressure drop above 

the limit established during 

the performance test (not 

applicable to a non-venturi 

wet scrubber of the jetejector design); and maintain 

the daily average liquid-togas ratio above the limit 

established during the 

performance test.).
57 

For each new or 

existing catalytic 

cracking unit . . . 

For this type of 

continuous 

monitoring system 

. . . 

For this type of 

control device . . . 

You shall meet this 

operating limit . . . 

(3) Maintain the 3-hour 

rolling average liquid-togas ratio above the limit 

established in the 

performance test. 

Alternatively, before [THE 

DATE 18 MONTHS 

AFTER THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

you may maintain the daily 

average liquid-to-gas ratio 

above the limit established 

during the performance 

test. 

57. Option 4: Ni 

lb/1,000 lbs ofper

coke burn-off limit 

not subject to the 

NSPS for PM in 

40 CFR 60.102 

a. Continuous opacity 

monitoring system 

ElectrostaticCyclone, 

baghouse, or 

electrostatic

precipitator 

MaintainMaintain the 3-

hour rolling average Ni 

operating value no higher 

than Ni operating limit 

established during the 

performance test. 

Alternatively, before [THE 

DATE 18 MONTHS 

AFTER THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

you may elect to maintain

the daily average Ni 

operating value no higher 

than the Ni operating limit 

established during the 

performance test. 

b. Continuous 

parameter 

monitoring systems 

i. Electrostatic 

precipitator 

(1) Maintain the monthly 

rolling average of the 

equilibrium catalyst Ni 

concentration no higher 

than the limit established 
58 

For each new or 

existing catalytic 

cracking unit . . . 

For this type of 

continuous 

monitoring system 

. . . 

For this type of 

control device . . . 

You shall meet this 

operating limit . . . 

during the performance 

test. 

b. Continuous 

parameter monitoring 

systems.

i. Electrostatic 

precipitator

(2) Maintain the monthly3-

hour rolling average of the 

equilibrium catalyst Ni 

concentration no higher 

thantotal power and 

secondary current above

the limit established during

the performance test; and. 

Alternatively, before [THE 

DATE 18 MONTHS 

AFTER THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

you may maintain the daily 

average voltage and 

secondary current f(or total 

power input) above the limit 

established during the 

performance test. 

ii. Wet scrubber (1) Maintain the monthly 

rolling average of the 

equilibrium catalyst Ni 

concentration no higher 

than the limit established 

during the performance 

test. 

 ii. Wet scrubber (2) Maintain the monthly3-

hour rolling average of the 

equilibrium catalyst Ni 

concentration no higher 

thanpressure drop above the 

limit established during the 

performance test;. 

Alternatively, before [THE 

DATE 18 MONTHS 

AFTER THE DATE OF 

PUBLICATION OF THE 
59 

For each new or 

existing catalytic 

cracking unit . . . 

For this type of 

continuous 

monitoring system 

. . . 

For this type of 

control device . . . 

You shall meet this 

operating limit . . . 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

you may maintain the daily 

average pressure drop above 

the limit established during 

the performance test (not 

applicable to a non-venturi 

wet scrubber of the jetejector design); and maintain 

the daily average liquid-togas ratio above the limit 

established during the 

performance test.).

(3) Maintain the 3-hour 

rolling average liquid-togas ratio above the limit 

established in the 

performance test. 

Alternatively, before [THE 

DATE 18 MONTHS 

AFTER THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

you may maintain the daily 

average liquid-to-gas ratio 

above the limit established 

during the performance 

test. 

Table 3 to Subpart UUU of Part 63—ContinousContinuous Monitoring Systems for Metal 

HAP Emissions From Catalytic Cracking Units 

As stated in §63.1564(b)(1), you shall meet each requirement in the following table that applies 

to you. 
60 

For each new or existing 

catalytic cracking unit 

. . . 

If your 

catalytic 

cracking 

unit is 

. . .

AndIf you use 

this type of 

control device 

for your vent 

. . . 

You shall install, operate, and 

maintain a . . . 

1. Subject to the NSPS 

for PM in 40 CFR 

60.102 

a. Cyclone Continuous opacity monitoring 

system to measure and record the 

opacity of emissions from each 

catalyst regenerator vent. 

1. Subject to the NSPS for 

PM in 40 CFR 60.102

Any size b. Electrostatic 

precipitator or 

wet scrubber or 

no control 

device

Continuous opacity monitoring system 

to measure and record the opacity of 

emissions from each catalyst 

regenerator vent.; or continuous 

parameter monitoring systems to 

measure and record the coke burnoff rate or the gas flow rate entering 

or exiting the control device1 and the 

total power and secondary current 

to the control device.

2. Option 1: NSPS limits 

not subject to the NSPS 

for PM in 40 CFR 60.102

Any size Electrostatic 

precipitator or 

wetc. Wet

scrubber or no 

control device

ContinuousContinuous parameter 

monitoring system to measure and 

record the pressure drop across the 

scrubber2, coke burn-off rate or the 

gas flow rate entering or exiting the 

control device1, and total liquid (or 

scrubbing liquor) flow rate to the 

control device. Alternatively, before 

[THE DATE 3 YEARS AFTER 

THE DATE OF PUBLICATION OF 

THE FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], continuous

opacity monitoring system to measure 

and record the opacity of emissions 

from each catalyst regenerator vent. 

d. Fabric 

Filter 

Continuous bag leak detection 

system to measure and record 

increases in relative particulate 

loading from each catalyst 

regenerator vent or a continuous 

opacity monitoring system to 

measure and record the opacity of 

emissions from each catalyst 

regenerator vent. 
61 

For each new or existing 

catalytic cracking unit 

. . . 

If your 

catalytic 

cracking 

unit is 

. . .

AndIf you use 

this type of 

control device 

for your vent 

. . . 

You shall install, operate, and 

maintain a . . . 

3. Option 2: PM limit not 

subject. Subject to the 

NSPS for PM in 40 CFR 

60.102102a(b)(1)(i) 

electing to meet the PM 

per coke burn-off limit.

a. Over 

20,000 

barrels per 

day fresh 

feed 

capacity

a. Cyclone 

Electrostatic 

precipitator

Continuous opacity monitoring system 

to measure and record the opacity of 

emissions from each catalyst 

regenerator vent. 

b. Up to 

20,000 

barrels per 

day fresh 

feed 

capacity

b. Electrostatic 

precipitator 

Continuous opacity monitoring system 

to measure and record the opacity of 

emissions from each catalyst 

regenerator vent; or continuous 

parameter monitoring systems to 

measure and record the coke burn-off 

rate or the gas flow rate entering or 

exiting the control device1 anddevice1,

the voltage, current, and secondary 

current (or total power input) to the 

control device. 

c. Any size ic. Wet 

scrubber 

(1) Continuous parameter monitoring 

system to measure and record the 

pressure drop across the 

scrubber,scrubber2, the coke burn-off 

rate or the gas flow rate entering or 

exiting the control device1, and total 

liquid (or scrubbing liquor) flow rate to 

the control device. 

 d. Fabric 

Filter

(2) If you use a wet scrubber of the 

non-venturi jet-ejector design, you're 

not required to install and operate a 

continuous parameter monitoring 

system for pressure drop.Continuous 

bag leak detection system to measure 

and record increases in relative 

particulate loading from each 

catalyst regenerator vent.

3. Subject to NSPS for 

PM in 40 CFR 

60.102a(b)(1)(i) electing 

to meet the PM 

concentration limit.

d. Any size No electrostatic 

precipitator or 

wet 

scrubberAny

Continuous opacityemission

monitoring system to measure and 

record the opacityconcentration of 

emissionsPM and oxygen from each 

catalyst regenerator vent. 
62 

For each new or existing 

catalytic cracking unit 

. . . 

If your 

catalytic 

cracking 

unit is 

. . .

AndIf you use 

this type of 

control device 

for your vent 

. . . 

You shall install, operate, and 

maintain a . . . 

4. Subject to NSPS for 

PM in 40 CFR 

60.102a(b)(1)(ii) electing 

to meet the PM per coke 

burn-off limit. 

Any See item 2 of this table. 

5. Subject to NSPS for 

PM in 40 CFR 

60.102a(b)(1)(ii) electing 

to meet the PM 

concentration limit. 

Any See item 3 of this table. 

6. Option 1: PM per 

coke burn-off limit not 

subject to the NSPS for 

PM in 40 CFR 60.102 or 

40 CFR 60.120a(b)(1). 

Any See item 1 of this table. 

7. Option 2: PM 

concentration limit not 

subject to the NSPS for 

PM in 40 CFR 60.102 or 

40 CFR 60.120a(b)(1) 

Any See item 3 of this table. 

48. Option 3: Ni lb/hr 

limit not subject to the 

NSPS for PM in 40 CFR 

60.102 or in 40 CFR 

60.102a(b)(1)

a. Over 

20,000 

barrels per 

day fresh 

feed 

capacity

Electrostatic 

precipitatora. 

Cyclone

Continuous opacity monitoring system 

to measure and record the opacity of 

emissions from each catalyst 

regenerator vent and continuous 

parameter monitoring system to 

measure and record the coke burn-off 

rate or the gas flow rate entering or 

exiting the control device1. 

b. Up to 

20,000 

barrels per 

day fresh 

feed 

capacity

b. Electrostatic 

precipitator 

Continuous opacity monitoring system 

to measure and record the opacity of 

emissions from each catalyst 

regenerator vent and continuous 

parameter monitoring system to 

measure and record the coke burn-off 

rate or the gas flow rate entering or 

exiting the control device1; or 

continuous parameter monitoring 

systems to measure and record the 

coke burn-off rate or the gas flow 
63 

For each new or existing 

catalytic cracking unit 

. . . 

If your 

catalytic 

cracking 

unit is 

. . .

AndIf you use 

this type of 

control device 

for your vent 

. . . 

You shall install, operate, and 

maintain a . . . 

rate entering or exiting the control 

device1

 and the voltage and current 

[to measure the total power to the 

system] and secondary current (or 

total power input) to the control 

device. 

c. Any size c. Wet scrubber (1) Continuous parameter monitoring 

system to measure and record the 

pressure drop across the scrubber2, gas 

flow rate entering or exiting the control 

device1, and total liquid (or scrubbing 

liquor) flow rate to the control device. 

(2) If you use a wet scrubber of the 

non-venturi jet-ejector design, you're 

not required to install and operate a 

continuous parameter monitoring 

system for pressure drop. 

d. Any size No electrostatic 

precipitator or 

wet scrubberd. 

Fabric Filter

Continuous opacity monitoring bag 

leak detection system to measure and 

record the opacity of 

emissionsincreases in relative 

particulate loading from each catalyst 

regenerator vent and continuous 

parameter monitoring system to 

measure and record the gas flow 

rate1or the monitoring systems 

specified in item 8.a of this table. 

59. Option 4: Ni lb/1,000 

lbs of coke burn-off limit 

not subject to the NSPS 

for PM in 40 CFR 60.102

or in 40 CFR 

60.102a(b)(1)

a. Over 

20,000 

barrels per 

day fresh 

feed 

capacity

Electrostatic 

precipitatora. 

Cyclone

Continuous opacity monitoring system 

to measure and record the opacity of 

emissions from each catalyst 

regenerator vent and continuous 

parameter monitoring system to 

measure and record the gas flow rate 

entering or exiting the control device1. 

b. Up to 

20,000 

barrels per 

day fresh 

feed 

b. Electrostatic 

precipitator 

Continuous opacity monitoring system 

to measure and record the opacity of 

emissions from each catalyst 

regenerator vent and continuous 

parameter monitoring system to 
64 

For each new or existing 

catalytic cracking unit 

. . . 

If your 

catalytic 

cracking 

unit is 

. . .

AndIf you use 

this type of 

control device 

for your vent 

. . . 

You shall install, operate, and 

maintain a . . . 

capacity measure and record the coke burn-off 

rate or the gas flow rate entering or 

exiting the control device1; or 

continuous parameter monitoring 

systems to measure and record the 

coke burn-off rate or the gas flow 

rate entering or exiting the control 

device1 and the voltage and current 

[to measure the total power to the 

system] and secondary current (or 

total power input) to the control 

device. 

c. Any size c. Wet scrubber Continuous parameter monitoring 

system to measure and record the 

pressure drop across the scrubber2, gas 

flow rate entering or exiting the control 

device1

, and total liquid (or scrubbing 

liquor) flow rate to the control device. 

d. Any size No electrostatic 

precipitator or 

wet scrubberd. 

Fabric Filter

Continuous opacity monitoring bag 

leak detection system to measure and 

record the opacity of 

emissionsincreases in relative 

particulate loading from each catalyst 

regenerator vent and continuous 

parameter monitoring system to 

measure and record the gas flow 

rate1or the monitoring systems 

specified in item 9.a of this table. 

1

If applicable, you can use the alternative in §63.1573(a)(1) instead of a continuous parameter monitoring system for 

gas flow rate. 

2

If you use a jet ejector type wet scrubber or other type of wet scrubber equipped with atomizing spray 

nozzles, you can use the alternative in §63.1573(b) instead of a continuous parameter monitoring system for 

pressure drop across the scrubber. 

Table 4 to Subpart UUU of Part 63—Requirements for Performance Tests for Metal HAP 

Emissions From Catalytic Cracking Units Not Subject to the New Source Performance 

Standard (NSPS) for Particulate Matter (PM) 
65 

As stated in §63.1564(b)(2), you shall meet each requirement in the following table that applies 

to you. 

For each new or 

existing catalytic 

cracking unit 

catalyst regenerator 

vent . . . You must . . . Using . . . 

According to these 

requirements . . . 

1. If you elect Option 

1 in item 2 of Table 

1, Option 2 in item 3 

of Table 1, Option 3 

in item 4 of Table 1, 

or Option 4 in item 5 

of Table 1 of this 

subpart.1. Any.

a. Select sampling 

port's location and the 

number of traverse 

ports. 

Method 1 or 1A in 

aAppendix A-1 to 

part 60 of this 

chapter. 

Sampling sites must be 

located at the outlet of the 

control device or the 

outlet of the regenerator, 

as applicable, and prior to 

any releases to the 

atmosphere. 

 b. Determine velocity 

and volumetric flow 

rate. 

Method 2, 2A, 2C, 

2D, 2F, in 

Appendix A-1 to 

part 60 of this 

chapter, or 2G in 

aAppendix A-2 to 

part 60 of this 

chapter, as 

applicable. 

 c. Conduct gas 

molecular weight 

analysis. 

Method 3, 3A, or 3B 

in aAppendix A-2 to 

part 60 of this 

chapter, as 

applicable. 

 d. Measure moisture 

content of the stack gas.

Method 4 in 

aAppendix A-3 to 

part 60 of this 

chapter. 

 e. If you use an electrostaticelectrostatic

precipitator, record the 

total number of fields 

in the control system 

and how many operated 

during the applicable 

performance test. 

 
66 

For each new or 

existing catalytic 

cracking unit 

catalyst regenerator 

vent . . . You must . . . Using . . . 

According to these 

requirements . . . 

 f. If you use a wet 

scrubber, record the 

total amount (rate) of 

water (or scrubbing 

liquid) and the amount 

(rate) of make-up liquid 

to the scrubber during 

each test run. 

 

2. Option 1: ElectPM 

per coke burn-off 

limit, not subject to 

the NSPS for PM in 

40 CFR 60.102 or in 

40 CFR 

60.102a(b)(1)

a. Measure PM 

emissions. 

Method 5, 5B, or 5F 

(40 CFR part 60, 

aAppendix A-3) to 

determine PM 

emissions and 

associated moisture 

content for units 

without wet 

scrubbers. Method 5 

or 5B (40 CFR part 

60, aAppendix A-3) 

to determine PM 

emissions and 

associated moisture 

content for unit with 

wet scrubber. 

You must maintain a 

sampling rate of at least 

0.15 dry standard cubic 

meters per minute 

(dscm/min) (0.53 dry 

standard cubic feet per 

minute (dscf/min). 

 b. Compute coke burnoff rate and PM 

emission rate (lbs/1,000 

lbs) of coke burn-off.).

Equations 1, 2, and 3 

of §63.1564 (if 

applicable). 

c. Measure opacity of 

emissions.

Continuous opacity 

monitoring system. 

You must collect opacity 

monitoring data every 10 

seconds during the entire 

period of the Method 5B 

or 5F performance test 

and reduce the data to 6-

minute averages. 

3. Option 2: PM limit a. Measure PM 

emissions. 

See item 2. of this 

table. 

See item 2. of this table. 
67 

For each new or 

existing catalytic 

cracking unit 

catalyst regenerator 

vent . . . You must . . . Using . . . 

According to these 

requirements . . . 

b. Compute coke burnoff rate and PM 

emission rate. 

Equations 1 and 2 of 

§63.1564. 

c. Measure opacity of 

emissions.c. Establish 

your site-specific 

opacity operating limit 

if you use a continuous 

opacity monitoring 

system.

Data from the 

cContinuous opacity 

monitoring system. 

You must collect opacity 

monitoring data every 10 

seconds during the entire 

period of the Method 5, 

5B, or 5F performance 

test and reduce the data to 

6-minute averages; 

determine and record the 

hourly average opacity 

from all the 6-minute 

averages; and compute 

the site-specific limit 

using Equation 4 of 

§63.1564. 

4. Option 3: Ni 

lb/hr3. Option 2: 

PM concentration 

limit, not subject to 

the NSPS for PM in 

40 CFR 60.102 or in 

40 CFR 

60.102a(b)(1)

a. Measure PM 

concentration of Ni and 

total metal HAP. 

Method 29 (40 CFR 

part 60, appendix 

A).Method 5, 5B, or 

5F (40 CFR part 

60, Appendix A-3) 

to determine PM 

concentration and 

associated moisture 

content for units 

without wet 

scrubbers. Method 

5 or 5B (40 CFR 

part 60, Appendix 

A-3) to determine 

PM concentration 

and associated 

moisture content 

for unit with wet 

scrubber.

You must maintain a 

sampling rate of at least 

0.15 dry standard cubic 

meters per minute 

(dscm/min) (0.53 dry 

standard cubic feet per 

minute (dscf/min).
68 

For each new or 

existing catalytic 

cracking unit 

catalyst regenerator 

vent . . . You must . . . Using . . . 

According to these 

requirements . . . 

4. Option 3: Ni lb/hr 

limit, not subject to 

the NSPS for PM in 

40 CFR 60.102 or in 

40 CFR 

60.102a(b)(1) 

a. Measure 

concentration of Ni. 

Method 29 (40 CFR 

part 60, Appendix 

A-8). 

 b. Compute Ni 

emission rate (lb/hr). 

Equation 5 of 

§63.1564. 

 c. Determine the 

equilibrium catalyst Ni 

concentration. 

XRF procedure in 

aAppendix A to this 

subpart1; or EPA 

Method 6010B or 

6020 or EPA 

Method 7520 or 

7521 in SW-–8462

; 

or an alternative to 

the SW-846 method 

satisfactory to the 

Administrator. 

You must obtain 1 sample 

for each of the 3 runs; 

determine and record the 

equilibrium catalyst Ni 

concentration for each of 

the 3 samples; and you 

may adjust the laboratory 

results to the maximum 

value using Equation 2 of 

§63.1571. 

 d. If you use a 

continuous opacity 

monitoring system, 

establish your sitespecific Ni operating 

limit. 

i. Equations 6 and 7 

of §63.1564 using 

data from continuous 

opacity monitoring 

system, gas flow 

rate, results of 

equilibrium catalyst 

Ni concentration 

analysis, and Ni 

emission rate from 

Method 29 test. 

(1) You must collect 

opacity monitoring data 

every 10 seconds during 

the entire period of the 

initial Ni performance 

test; reduce the data to 6-

minute averages; and 

determine and record the 

hourly average opacity 

from all the 6-minute 

averages. 

 (2) You must collect gas 

flow rate monitoring data 

every 15 minutes during 

the entire period of the 

initial Ni performance 

test; measure the gas flow 

as near as practical to the 

continuous opacity 

monitoring system; and 
69 

For each new or 

existing catalytic 

cracking unit 

catalyst regenerator 

vent . . . You must . . . Using . . . 

According to these 

requirements . . . 

determine and record the 

hourly average actual gas 

flow rate from all the 

readings. 

5. Option 4: Ni 

lbs/1,000 lbs ofper

coke burn-off limit, 

not subject to the 

NSPS for PM in 40 

CFR 60.102 or in 40 

CFR 60.102a(b)(1)

a. Measure 

concentration of Ni and 

total HAP. 

Method 29 (40 CFR 

part 60, aAppendix 

A-8). 

 b. Compute Ni 

emission rate (lb/1,000 

lbs of coke burn-off). 

Equations 1 and 8 of 

§63.1564. 

 c. Determine the 

equilibrium catalyst Ni 

concentration. 

See item 4.c. of this 

table. 

You must obtain 1 sample 

for each of the 3 runs; 

determine and record the 

equilibrium catalyst Ni 

concentration for each of 

the 3 samples; and you 

may adjust the laboratory 

results to the maximum 

value using Equation 2 of 

§63.1571. 

 d. If you use a 

continuous opacity 

monitoring system, 

establish your sitespecific Ni operating 

limit. 

i. Equations 9 and 10 

of §63.1564 with 

data from continuous 

opacity monitoring 

system, coke burnoff rate, results of 

equilibrium catalyst 

Ni concentration 

analysis, and Ni 

emission rate from 

Method 29 test. 

(1) You must collect 

opacity monitoring data 

every 10 seconds during 

the entire period of the 

initial Ni performance 

test; reduce the data to 6-

minute averages; and 

determine and record the 

hourly average opacity 

from all the 6-minute 

averages. 

 (2) You must collect gas 

flow rate monitoring data 

every 15 minutes during 

the entire period of the 
70 

For each new or 

existing catalytic 

cracking unit 

catalyst regenerator 

vent . . . You must . . . Using . . . 

According to these 

requirements . . . 

initial Ni performance 

test; measure the gas flow 

rate as near as practical to 

the continuous opacity 

monitoring system; and 

determine and record the 

hourly average actual gas 

flow rate from all the 

readings. 

 e. Record the catalyst 

addition rate for each 

test and schedule for 

the 10- day period prior 

to the test. 

 

6. If you elect Option 

21 in Entry 3 in 

Table 1, Option 3 in 

Entryitem 4 in Table 

1, Option 3 in item 6 

in Table 1, or Option 

4 in Entry 5item 7 in 

Table 1 of this 

subpart and you use 

continuous parameter 

monitoring systems. 

a. Establish each 

operating limit in Table 

2 of this subpart that 

applies to you. 

Data from the 

continuous 

parameter 

monitoring systems 

and applicable 

performance test 

methods. 

 b. Electrostatic 

precipitator or wet 

scrubber: gas flow rate.

i. Data from the 

continuous 

parameter 

monitoring systems 

and applicable 

performance test 

methods. 

(1) You must collect gas 

flow rate monitoring data 

every 15 minutes during 

the entire period of the 

initial performance test; 

and determine and record 

the maximum hourly 

average gas flow rate 

from all the readings. 

(2) You must determine 

and record the 3-hr 

average gas flow rate 

from all the readings. 

Alternatively, before 

[THE DATE 18 
71 

For each new or 

existing catalytic 

cracking unit 

catalyst regenerator 

vent . . . You must . . . Using . . . 

According to these 

requirements . . . 

MONTHS AFTER THE 

DATE OF 

PUBLICATION OF 

THE FINAL RULE 

AMENDMENTS IN 

THE FEDERAL 

REGISTER], you may 

determine and record 

the maximum hourly 

average gas flow rate 

from all the readings. 

 c. Electrostatic 

precipitator: voltage 

and secondary current 

(or total power input). 

i. Data from the 

continuous 

parameter 

monitoring systems 

and applicable 

performance test 

methods. 

(1) You must collect 

voltage, current, and 

secondary current 

monitoring data every 

15 minutes during the 

entire period of the 

performance test. 

Alternatively, before 

[THE DATE 18 

MONTHS AFTER THE 

DATE OF 

PUBLICATION OF 

THE FINAL RULE 

AMENDMENTS IN 

THE FEDERAL 

REGISTER], you may

collect voltage and 

secondary current (or total 

power input) monitoring 

data every 15 minutes 

during the entire period of 

the initial performance 

test; and determine and 

record the minimum 

hourly average voltage 

and secondary current (or 

total power input) from all 

the readings. 
72 

For each new or 

existing catalytic 

cracking unit 

catalyst regenerator 

vent . . . You must . . . Using . . . 

According to these 

requirements . . . 

(2) You must determine 

and record the 3-hr 

average total power to 

the system and the 3-hr 

average secondary 

current. Alternatively, 

before [THE DATE 18 

MONTHS AFTER THE 

DATE OF 

PUBLICATION OF 

THE FINAL RULE 

AMENDMENTS IN 

THE FEDERAL 

REGISTER], you may 

determine and record 

the minimum hourly 

average voltage and 

secondary current (or 

total power input) from 

all the readings. 

 d. Electrostatic 

precipitator or wet 

scrubber: equilibrium 

catalyst Ni 

concentration. 

Results of analysis 

for equilibrium 

catalyst Ni 

concentration. 

You must determine and 

record the average 

equilibrium catalyst Ni 

concentration for the 3 

runs based on the 

laboratory results. You 

may adjust the value 

using Equation 1 or 2 of 

§63.1571 as applicable. 

 e. Wet scrubber: 

pressure drop (not 

applicable to nonventuri scrubber of jet 

ejector design). 

i. Data from the 

continuous 

parameter 

monitoring systems 

and applicable 

performance test 

methods. 

(1) You must collect 

pressure drop monitoring 

data every 15 minutes 

during the entire period of 

the initial performance 

test; and determine and 

record the minimum 

hourly average pressure 

drop from all the 

readings. 
73 

For each new or 

existing catalytic 

cracking unit 

catalyst regenerator 

vent . . . You must . . . Using . . . 

According to these 

requirements . . . 

(2) You must determine 

and record the 3-hr 

average pressure drop 

from all the readings. 

Alternatively, before 

[THE DATE 18 

MONTHS AFTER THE 

DATE OF 

PUBLICATION OF 

THE FINAL RULE 

AMENDMENTS IN 

THE FEDERAL 

REGISTER], you may 

determine and record 

the minimum hourly 

average pressure drop 

from all the readings. 

 f. Wet scrubber: liquidto-gas ratio i. Data from the 

continuous 

parameter 

monitoring systems 

and applicable 

performance test 

methods. 

(1) You must collect gas 

flow rate and total water 

(or scrubbing liquid) flow 

rate monitoring data every 

15 minutes during the 

entire period of the initial 

performance test; 

determine and record the 

hourly average gas flow 

rate and total water (or 

scrubbing liquid) flow 

rate from all the readings; 

and determine and record 

the minimum liquid-togas ratio. 

(2) You must determine 

and record the hourly 

average liquid-to-gas 

ratio from all the 

readings. Alternatively, 

before [THE DATE 18 

MONTHS AFTER THE 

DATE OF 
74 

For each new or 

existing catalytic 

cracking unit 

catalyst regenerator 

vent . . . You must . . . Using . . . 

According to these 

requirements . . . 

PUBLICATION OF 

THE FINAL RULE 

AMENDMENTS IN 

THE FEDERAL 

REGISTER], you may 

determine and record 

the hourly average gas 

flow rate and total water 

(or scrubbing liquid) 

flow rate from all the 

readings. 

(3) You must determine 

and record the 3-hr 

average liquid-to-gas 

ratio. Alternatively, 

before [THE DATE 18 

MONTHS AFTER THE 

DATE OF 

PUBLICATION OF 

THE FINAL RULE 

AMENDMENTS IN 

THE FEDERAL 

REGISTER], you may 

determine and record 

the minimum liquid-togas ratio. 

 g. Alternative 

procedure for gas flow 

rate. 

i. Data from the 

continuous 

parameter 

monitoring systems 

and applicable 

performance test 

methods. 

(1) You must collect air 

flow rate monitoring data 

or determine the air flow 

rate using control room 

instrumentation every 15 

minutes during the entire 

period of the initial 

performance test; 

determine and record the 

hourly average rate of all 

the readings; and 

determine and record the 

maximum gas flow rate 

using Equation 1 of 
75 

For each new or 

existing catalytic 

cracking unit 

catalyst regenerator 

vent . . . You must . . . Using . . . 

According to these 

requirements . . . 

§63.1573. 

(2) You must determine 

and record the 3-hr 

average rate of all the 

readings. Alternatively, 

before [THE DATE 18 

MONTHS AFTER THE 

DATE OF 

PUBLICATION OF 

THE FINAL RULE 

AMENDMENTS IN 

THE FEDERAL 

REGISTER], you may 

determine and record 

the hourly average rate 

of all the readings. 

(3) You must determine 

and record the 

maximum gas flow rate 

using Equation 1 of 

§63.1573. 

1

Determination of Metal Concentration on Catalyst Particles (Instrumental Analyzer Procedure). 

2

EPA Method 6010B, Inductively Coupled Plasma-Atomic Emission Spectrometry, EPA Method 6020, Inductively 

Coupled Plasma-Mass Spectrometry, EPA Method 7520, Nickel Atomic Absorption, Direct Aspiration, and EPA 

Method 7521, Nickel Atomic Absorption, Direct Aspiration are included in “Test Methods for Evaluating Solid 

Waste, Physical/Chemical Methods,” EPA Publication SW-846, Revision 5 (April 1998). The SW-846 and Updates 

(document number 955-001-00000-1) are available for purchase from the Superintendent of Documents, U.S. 

Government Printing Office, Washington, DC 20402, (202) 512-1800; and from the National Technical Information 

Services (NTIS), 5285 Port Royal Road, Springfield, VA 22161, (703) 487-4650. Copies may be inspected at the 

EPA Docket Center (Air Docket), William Jefferson Clinton (WJC)EPA West Building, (Air Docket), Room 

3334B-108, 1301 Constitution Ave., NW., Washington, DC; or at the Office of the Federal Register, 800 North 

Capitol Street, NW., Suite 700, Washington, DC. 

Table 5 to Subpart UUU of Part 63—Initial Compliance With Metal HAP Emission Limits 

for Catalytic Cracking Units 

As stated in §63.1564(b)(5), you shall meet each requirement in the following table that applies 

to you. 
76 

For each new and 

existing catalytic 

cracking unit catalyst 

regenerator vent . . .

For the following emission limit . 

. . 

You have demonstrated initial 

compliance if . . . 

1. Subject to the 

NSPS for PM in 40 

CFR 60.102

PM emissions must not exceed 1.0 

gram per kilogram (g/kg/1,000 

kg) (1.0 lb/1,000 lb) of coke burnoff in the catalyst regenerator;. 

Before [THE DATE 18 

MONTHS AFTER THE DATE 

OF PUBLICATION OF THE 

FINAL RULE AMENDMENTS 

IN THE FEDERAL 

REGISTER], if the discharged 

gases pass through an incinerator or 

waste heat boiler in which you burn 

auxiliary or supplemental liquid or 

solid fossil fuel, the incremental 

rate of PM must not exceed 43.0 

grams per Gigajoule (g/GJ) or 0.10 

pounds per million British thermal 

units (lb/million Btu) of heat input 

attributable to the liquid or solid 

fossil fuel; and the opacity of 

emissions must not exceed 30 

percent, except for one 6-minute 

average opacity reading in any 1-

hour period 

You have already conducted a 

performance test to demonstrate 

initial compliance with the NSPS 

and the measured PM emission 

rate is less than or equal to 1.0 

kg/1,000 g/kg (1.0 lb/1,000 lb) of 

coke burn-off in the catalyst 

regenerator. As part of the 

Notification of Compliance Status, 

you must certify that your vent 

meets the PM limit. You are not 

required to do another 

performance test to demonstrate 

initial compliance. If applicable, 

you have already conducted a 

performance test to demonstrate 

initial compliance with the NSPS 

and the measured PM rate is less 

than or equal to 43.0 g/GJ (0.10 

lb/million Btu) of heat input 

attributable to the liquid or solid 

fossil fuel. As part of the 

Notification of Compliance Status, 

you must certify that your vent 

meets the PM emission limit.As 

part of your Notification of 

Compliance Status, you certify 

that your BLD; CO2, O2, or CO 

monitor; or continuous opacity 

monitoring system meets the 

requirements in §63.1572. You 

are not required to do another 

performance test to demonstrate 

initial compliance. You have 

already conducted a performance 

test to demonstrate initial 

compliance with the NSPS and the 

average hourly opacity is no more 

than 30 percent. Except: One 6-

minute average in any 1-hour 

period can exceed 30 percent. As 

part of the Notification of 
77 

For each new and 

existing catalytic 

cracking unit catalyst 

regenerator vent . . .

For the following emission limit . 

. . 

You have demonstrated initial 

compliance if . . . 

Compliance Status, you must 

certify that your vent meets the 

opacity limit. You are not required 

to do another performance test to 

demonstrate initial compliance. 

You have already conducted a 

performance evaluation to 

demonstrate initial compliance 

with the applicable performance 

specification. As part of your 

Notification of Compliance Status, 

you certify that your continuous 

opacity monitoring system meets 

the requirements in §63.1572. You 

are not required to do a 

performance evaluation to 

demonstrate initial compliance.

2. Subject to NSPS 

for PM in 40 CFR 

60.102a(b)(1)(i), 

electing to meet the 

PM per coke burn-off 

limit. 

PM emissions must not exceed 

0.5 g/kg (0.5 lb PM/1,000 lb) of 

coke burn-off or, 

You have already conducted a 

performance test to demonstrate 

initial compliance with the NSPS 

and the measured PM emission 

rate is less than or equal to 1.0 g/ 

kg (1.0 lb/1,000 lb) of coke burnoff in the catalyst regenerator. 

As part of the Notification of 

Compliance Status, you must 

certify that your vent meets the 

PM limit. You are not required to 

do another performance test to 

demonstrate initial compliance. As 

part of your Notification of 

Compliance Status, you certify 

that your BLD; CO2, O2, or CO 

monitor; or continuous opacity 

monitoring system meets the 

requirements in §63.1572. 

3. Subject to NSPS 

for PM in 40 CFR 

60.102a(b)(1)(ii), 

electing to meet the 

PM per coke burn-off 

PM emissions must not exceed 

1.0 g/kg coke burn-off (1 lb/1000 

lb coke burn-off). 

You have already conducted a 

performance test to demonstrate 

initial compliance with the NSPS 

and the measured PM emission 

rate is less than or equal to 0.5 
78 

For each new and 

existing catalytic 

cracking unit catalyst 

regenerator vent . . .

For the following emission limit . 

. . 

You have demonstrated initial 

compliance if . . . 

limit. kg/1,000 kg (0.5 lb/1,000 lb) of 

coke burn-off in the catalyst 

regenerator. As part of the 

Notification of Compliance 

Status, you must certify that 

your vent meets the PM limit. 

You are not required to do 

another performance test to 

demonstrate initial compliance. 

As part of your Notification of 

Compliance Status, you certify 

that your BLD; CO2, O2, or CO 

monitor; or continuous opacity 

monitoring system meets the 

requirements in §63.1572. 

4. Subject to NSPS 

for PM in 40 CFR 

60.102a(b)(1)(i), 

electing to meet the 

PM concentration 

limit. 

If a PM CEMS is used, 0.020 

grain per dry standard cubic feet 

(gr/dscf) corrected to 0 percent 

excess air. 

You have already conducted a 

performance test to demonstrate 

initial compliance with the NSPS 

and the measured PM 

concentration is less than or 

equal to 0.020 grain per dry 

standard cubic feet (gr/dscf) 

corrected to 0 percent excess air. 

As part of the Notification of 

Compliance Status, you must 

certify that your vent meets the 

PM limit. You are not required to 

do another performance test to 

demonstrate initial compliance. As 

part of your Notification of 

Compliance Status, you certify 

that your PM CEMS meets the 

requirements in §63.1572. 

5. Subject to NSPS 

for PM in 40 CFR 

60.102a(b)(1)(ii), 

electing to meet the 

PM concentration 

limit. 

If a PM CEMS is used, 0.040 

gr/dscf corrected to 0 percent 

excess air. 

You have already conducted a 

performance test to demonstrate 

initial compliance with the NSPS 

and the measured PM 

concentration is less than or 

equal to 0.040 gr/dscf corrected 

to 0 percent excess air. As part 

of the Notification of 
79 

For each new and 

existing catalytic 

cracking unit catalyst 

regenerator vent . . .

For the following emission limit . 

. . 

You have demonstrated initial 

compliance if . . . 

Compliance Status, you must 

certify that your vent meets the 

PM limit. You are not required 

to do another performance test 

to demonstrate initial 

compliance. As part of your 

Notification of Compliance 

Status, you certify that your PM 

CEMS meets the requirements 

in §63.1572. 

26. Option 1: Elect 

NSPSPM per coke 

burn-off limit not 

subject to the NSPS for 

PM in 40 CFR 60.102 

or 40 CFR 

60.120a(b)(1)

PM emission must not exceed 1.0 

kg/1,000 PM emissions must not 

exceed 1.0 gram per kilogram 

(g/kg) (1.0 lb/1,000 lb) of coke 

burn-off. Before [THE DATE 3 

YEARS AFTER THE DATE OF 

PUBLICATION OF THE 

FINAL RULE AMENDMENTS 

IN THE FEDERAL 

REGISTER], PM emission must 

not exceed 1.0 g/kg (1.0 lb/1,000 

lb) of coke burn-off in the catalyst 

regenerator; if the discharged gases 

pass through an incinerator or 

waste heat boiler in which you burn 

auxiliary or supplemental liquid or 

solid fossil fuel, the incremental 

rate of PM must not exceed 43.0 

g/GJ (0.10 lb/million Btu) of heat 

input attributable to the liquid or 

solid fossil fuel; and the opacity of 

emissions must not exceed 30 

percent, except for one 6-minute 

average opacity reading in any 1-

hour period 

The average PM emission rate, 

measured using EPA Method 5, 

5B, or 5F (for a unit without a wet 

scrubber) or 5 or 5B (for a unit 

with a wet scrubber), over the 

period of the initial performance 

test, is no higher than 1.0 

g/kg/1,000 kg coke burn-off (1.0 

lb/1,000 lb of coke burn-off ) in 

the catalyst regenerator. The PM 

emission rate is calculated using 

Equations 1, 2, and 2 of §63.1564. 

If applicable, the average PM 

emission rate, measured using 

EPA Method 5B emission rate, 

measured using EPA Method 5B 

or 5F (for a unit without a wet 

scrubber) or Method 5B (for a unit 

with a wet scrubber) over the 

period of the initial performance 

test, is no higher than 43.0 g/GJ 

(0.10 lb/million Btu) of heat input 

attributable to the liquid or solid 

fossil fuel. The PM emission rate 

is calculated using Equation 3 of 

§63.1564; no more than one 6-

minute average measured by the . 

If you use a BLD; CO2, O2, CO 

monitor; or continuous opacity 

monitoring system exceeds 30 

percent opacity in any 1-hour 

period over the period of the 
80 

For each new and 

existing catalytic 

cracking unit catalyst 

regenerator vent . . .

For the following emission limit . 

. . 

You have demonstrated initial 

compliance if . . . 

performance test; and, your 

performance evaluation shows the 

continuous opacity monitoring 

system meets the applicable 

requirements in §63.1572. 

37. Option 2: NotPM 

concentration limit, 

not subject to the 

NSPS for PM in 40 

CFR 60.102 or in 40 

CFR 60.102a(b)(1)

PM emissions must not exceed 1.0

kg/1,000 kg (1..040 gr/dscf 

corrected to 0 lb/1,000 lb) of coke 

burn-off in the catalyst 

regeneratorpercent excess air.

The average PM emission 

rateconcentration, measured 

using EPA Method 5, 5B, or 5F 

(for a unit without a wet scrubber) 

or Method 5 or 5B (for a unit with 

a wet scrubber), over the period of 

the initial performance test, is less 

than or equal to 1.0 kg/1,000 kg 

(1..040 gr/dscf corrected to 0 

lb/1,000 lb) of coke burn-off in the 

catalyst regenerator. The PM 

emission rate is calculated using 

Equations 1 and 2 of §63.1564; 

and if you use a continuous 

opacity monitoring system, your 

percent excess air. Your 

performance evaluation shows the 

systemyour PM CEMS meets the 

applicable requirements in 

§63.1572. 

48. Option 3: not 

subject to the NSPS for 

PM 

Nickel (Ni) emissions from your 

catalyst regenerator vent must not 

exceed 13,000 mg/hr (0.029 lb/hr). 

The average Ni emission rate, 

measured using Method 29 over 

the period of the initial 

performance test, is not more than 

13,000 mg/hr (0.029 lb/hr). The Ni 

emission rate is calculated using 

Equation 5 of §63.1564; and if you 

use a BLD; CO2, O2, or CO 

monitor; or continuous opacity 

monitoring system, your 

performance evaluation shows the 

system meets the applicable 

requirements in §63.1572. 

59. Option 4: Ni 

lb/1,000 lbs ofper coke 

burn-off limit not 

Ni emissions from your catalyst 

regenerator vent must not exceed 

1.0 mg/kg (0.001 lb/1,000 lbs) of 

The average Ni emission rate, 

measured using Method 29 over 

the period of the initial 
81 

For each new and 

existing catalytic 

cracking unit catalyst 

regenerator vent . . .

For the following emission limit . 

. . 

You have demonstrated initial 

compliance if . . . 

subject to the NSPS for 

PM. 

coke burn-off in the catalyst 

regenerator. 

performance test, is not more than 

1.0 mg/kg (0.001 lb/1,000 lbs) of 

coke burn-off in the catalyst 

regenerator. The Ni emission rate 

is calculated using Equation 8 of 

§63.1564; and if you use a BLD; 

CO2, O2, or CO monitor; or 

continuous opacity monitoring 

system, your performance 

evaluation shows the system meets 

the applicable requirements in 

§63.1572.

Table 6 to Subpart UUU of Part 63—Continuous Compliance With Metal HAP Emission 

Limits for Catalytic Cracking Units 

As stated in §63.1564(c)(1), you shall meet each requirement in the following table that applies 

to you. 

For each new and 

existing catalytic 

cracking unit . . . 

Subject to this emission limit 

for your catalyst regenerator 

vent . . . 

You shall demonstrate 

continuous compliance by . . . 

1. Subject to the NSPS for 

PM in 40 CFR 60.102 

a. PM emissions must not exceed 

1.0 gram per kilogram 

(g/kg/1,000 kg) (1.0 lb/1,000 lb) 

of coke burn-off in the catalyst 

regenerator;. Before [THE 

DATE 18 MONTHS AFTER 

THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], if the 

discharged gases pass through an 

incinerator or waste heat boiler in 

which you burn auxiliary or 

supplemental liquid or solid 

fossil fuel, the incremental rate of 

PM must not exceed 43.0 g/GJ 

(0.10 lb/million Btu) of heat 

input attributable to the liquid or 

i. Determining and recording each 

day the average coke burn-off 

rate (thousands of kilograms per 

hour) using Equation 1 in 

§63.1564 and the hours of 

operation for each catalyst 

regenerator; maintaining PM 

emission rate below 1.0 kg/1,000 

kg (1.0 lb/1,000 lbs) of coke 

burn-off; if applicable, 

determining and recording each 

day the rate of combustion of 

liquid or solid fossil fuels 

(liters/hour or kilograms/hour) 

and the hours of operation during 

which liquid or solid fossil-fuels 

are combusted in the incineratorwaste heat boiler; if applicable, 

maintaining the PM rate 
82 

For each new and 

existing catalytic 

cracking unit . . . 

Subject to this emission limit 

for your catalyst regenerator 

vent . . . 

You shall demonstrate 

continuous compliance by . . . 

solid fossil fuel; and the opacity 

of emissions must not exceed 30 

percent, except for one 6-minute 

average opacity reading in any 1-

hour period 

incinerator below 43 g/GJ (0.10 

lb/million Btu) of heat input 

attributable to the solid or liquid 

fossil fuel; collecting the 

continuous opacity monitoring 

data for each catalyst regenerator 

vent according to §63.1572; and 

maintaining each 6-minute 

average at or below 30 percent 

except that one 6-minute average 

during a 1-hour period can exceed 

30 percent..

ii. Maintaining PM emission 

rate below 1.0 g/kg (1.0 lb/1,000 

lb) of coke burn-off. 

iii. Conducting a performance 

test before [THE DATE 18 

MONTHS AFTER THE DATE 

OF PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER] and 

once every five years thereafter.

iv. Collecting the applicable 

continuous parametric 

monitoring system data 

according to §63.1572 and 

maintaining each rolling 3-hr 

average above or below (as 

applicable) the average 

determined during the 

performance test. 

v. Collecting the continuous 

opacity monitoring data for 

each catalyst regenerator vent 

according to §63.1572 and 

maintaining each 6-minute 

average at or below the sitespecific opacity determined 

during the performance test. 

Alternatively, before [THE 

DATE 18 MONTHS AFTER 
83 

For each new and 

existing catalytic 

cracking unit . . . 

Subject to this emission limit 

for your catalyst regenerator 

vent . . . 

You shall demonstrate 

continuous compliance by . . . 

THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

collecting the continuous 

opacity monitoring data for 

each catalyst regenerator vent 

according to §63.1572 and 

maintaining each 6-minute 

average at or below 30 percent, 

except that one 6-minute 

average during a 1-hour period 

can exceed 30 percent. 

vi. Before [THE DATE 18 

MONTHS AFTER THE DATE 

OF PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], if 

applicable, determining and 

recording each day the rate of 

combustion of liquid or solid 

fossil fuels (liters/hour or 

kilograms/hour) and the hours 

of operation during which 

liquid or solid fossil-fuels are 

combusted in the incineratorwaste heat boiler; if applicable, 

maintaining the incremental 

rate of PM at or below 43 g/GJ 

(0.10 lb/million Btu) of heat 

input attributable to the solid 

or liquid fossil fuel. 

2. Option 1: Elect NSPS 

not subjectSubject to the 

NSPS for PM in 40 CFR 

60.102102a(b)(1)(i), 

electing to meet the PM 

per coke burn-off limit.

See item 1.a. of this tablePM 

emissions must not exceed 0.5 

g/kg (0.5 lb PM/1,000 lb) of 

coke burn-off 

See item 1.a.i. of this 

table.Determining and 

recording each day the average 

coke burn-off rate (thousands 

of kilograms per hour) using 

Equation 1 in §63.1564 and the 

hours of operation for each 

catalyst regenerator; 
84 

For each new and 

existing catalytic 

cracking unit . . . 

Subject to this emission limit 

for your catalyst regenerator 

vent . . . 

You shall demonstrate 

continuous compliance by . . . 

maintaining PM emission rate 

below 0.5 g/kg (0.5 lb PM/1,000 

lb) of coke burn-off; conducting 

a performance test once every 

year; collecting the applicable 

continuous parametric 

monitoring system data 

according to §63.1572 and 

maintaining each rolling 3-hr 

average above or below (as 

applicable) the average 

determined during the 

performance test; collecting the 

continuous opacity monitoring 

data for each regenerator vent 

according to §63.1572 and 

maintaining each 6-minute 

average at or below the sitespecific opacity determined 

during the performance test.

3. Option 2: PM limit not 

subjectSubject to the 

NSPS for PM in 40 CFR 

60.102a(b)(1)(ii), electing 

to meet the PM per coke 

burn-off limit.

PM emissions must not exceed 

1.0 g/kg/1,000 kg (1.0 lb/1,000 

lb) of coke burn-off in the 

catalyst regenerator(1 lb/1000 lb 

coke burn-off).

Determining and recording each 

day the average coke burn-off 

rate (thousands of kilograms per 

hour) using Equation 1 in 

§63.1564 and the hours of 

operation for each catalyst 

regenerator by Equation 1 of 

§63.1564 (you can use process 

data to determine the volumetric 

flow rate); and maintaining the ; 

maintaining PM emission rate 

below 1.0 kg/1,000 g/kg (1.0 

lb/1,000 lb) of coke burn-off; 

conducting a performance test 

once every year; collecting the 

applicable continuous 

parametric monitoring system 

data according to §63.1572 and 

maintaining each rolling 3-hr 

average above or below (as 

applicable) the average 

determined during the 

performance test; collecting the 
85 

For each new and 

existing catalytic 

cracking unit . . . 

Subject to this emission limit 

for your catalyst regenerator 

vent . . . 

You shall demonstrate 

continuous compliance by . . . 

continuous opacity monitoring 

data for each regenerator vent 

according to §63.1572 and 

maintaining each 6-minute 

average at or below the sitespecific opacity determined 

during the performance test. 

4. Subject to NSPS for 

PM in 40 CFR 

60.102a(b)(1)(i), electing 

to meet the PM 

concentration limit. 

If a PM CEMS is used, 0.020 

grain per dry standard cubic 

feet (gr/dscf) corrected to 0 

percent excess air. 

Maintaining PM concentration 

below 0.020 gr/dscf corrected to 

0 percent excess air. 

5. Subject to NSPS for 

PM in 40 CFR 

60.102a(b)(1)(ii), electing 

to meet the PM 

concentration limit. 

If a PM CEMS is used, 0.040 

gr/dscf corrected to 0 percent 

excess air. 

Maintaining PM concentration 

below 0.040 gr/dscf corrected to 

0 percent excess air. 

6. Option 1: PM per coke 

burn-off limit, not 

subject to the NSPS for 

PM in 40 CFR 60.102 or 

in 40 CFR 60.102a(b)(1) 

See item 1 of this table See item 1 of this table. 

7. Option 2: PM 

concentration limit, not 

subject to the NSPS for 

PM in 40 CFR 60.102 or 

in 40 CFR 60.102a(b)(1) 

PM emissions must not exceed 

0.040 gr/dscf corrected to 0 

percent excess air. 

See item 5 of this table. 

48. Option 3: Ni lb/hr 

limit, not subject to the 

NSPS for PM. in 40 CFR 

60.102 or in 40 CFR 

60.102a(b)(1)

Ni emissions must not exceed 

13,000 mg/hr (0.029 lb/hr). 

Maintaining Ni emission rate 

below 13,000 mg/hr (0.029 

lb/hr); conducting a 

performance test before [THE 

DATE 18 MONTHS AFTER 

THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER] and 

once every five years 

thereafter; and collecting the 

applicable continuous 

parametric monitoring system 
86 

For each new and 

existing catalytic 

cracking unit . . . 

Subject to this emission limit 

for your catalyst regenerator 

vent . . . 

You shall demonstrate 

continuous compliance by . . . 

data according to §63.1572 and 

maintaining each rolling 3-hr 

average above or below (as 

applicable) the average 

determined during the 

performance test. 

59. Option 4: Ni lb/1,000 

lbs ofper coke burn-off 

limit, not subject to the 

NSPS for PM in 40 CFR 

60.102 or in 40 CFR 

60.102a(b)(1)

Ni emissions must not exceed 1.0 

mg/kg (0.001 lb/1,000 lbs) of 

coke burn-off in the catalyst 

regenerator 

Determining and recording each 

day the average coke burn-off 

rate (thousands of kilograms per 

hour) and the hours of operation 

for each catalyst regenerator by 

Equation 1 of §63.1564 (you can 

use process data to determine the 

volumetric flow rate); and 

maintaining Ni emission rate 

below 1.0 mg/kg (0.001 lb/1,000 

lbs) of coke burn-off in the 

catalyst regenerator; conducting 

a performance test before [THE 

DATE 18 MONTHS AFTER 

THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER] and 

once every five years 

thereafter; and collecting the 

applicable continuous 

parametric monitoring system 

data according to §63.1572 and 

maintaining each rolling 3-hr 

average above or below (as 

applicable) the average 

determined during the 

performance test. 

Table 7 to Subpart UUU of Part 63—Continuous Compliance With Operating Limits for 

Metal HAP Emissions From Catalytic Cracking Units 

As stated in §63.1564(c)(1), you shall meet each requirement in the following table that applies 

to you. 
87 

For each new or 

existing catalytic 

cracking unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance by . . .

1. Subject to NSPS 

for PM in 40 CFR 

60.102.

a. Continuous 

opacity monitoring 

system used to 

comply with 30 

percent opacity 

limit. 

Not applicable. Complying with Table 6 of this 

subpart. 

b. Continuous 

parametric 

monitoring 

systems – 

electrostatic 

precipitator 

The average gas 

flow rate entering 

or exiting the 

control device 

must not exceed 

the operating 

limit established 

during the 

performance test. 

Collecting the hourly and 3-hr 

rolling average gas flow rate 

monitoring data according to 

§63.1572; and maintaining the 

3-hr rolling average gas flow 

rate at or below the limit 

established during the 

performance test. 

The average total 

power and 

secondary current 

to the control 

device must not 

fall below the 

operating limit 

established during 

the performance 

test. 

Collecting the hourly and 3-hr 

rolling average total power 

and secondary current 

monitoring data according to 

§63.1572; and maintaining the 

3-hr rolling average total 

power and secondary current 

at or above the limit 

established during the 

performance test. 

c. Continuous 

parametric 

monitoring 

systems – wet 

scrubber 

The average 

pressure drop 

across the 

scrubber must not 

fall below the 

operating limit 

established during 

the performance 

test. 

Collecting the hourly and 3-hr 

rolling average pressure drop 

monitoring data according to 

§63.1572; and maintaining the 

3-hr rolling average pressure 

drop at or above the limit 

established during the 

performance test. 

The average 

liquid-to-gas ratio 

must not fall 

below the 

operating limit 

established during 

the performance 

Collecting the hourly and 3-hr 

rolling average gas flow rate 

and scrubber liquid flow rate 

monitoring data according to 

§63.1572; determining and 

recording the 3-hr liquid-togas ratio; and maintaining the 
88 

For each new or 

existing catalytic 

cracking unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance by . . .

test. 3-hr rolling average liquid-togas ratio at or above the limit 

established during the 

performance test. 

d. BLD – fabric 

filter 

Increases in 

relative 

particulate. 

Collecting and maintaining 

records of BLD system 

output; determining the cause 

of the alarm within 1 hour of 

the alarm; and alleviating the 

cause of the alarm within 3 

hours by corrective action. 

2. Option 1: Elect 

NSPS not subject to 

the NSPS for PM in 

40 CFR 60.102.

e. Continuous 

opacity monitoring 

system., used for 

site-specific 

opacity limit - 

Cyclone or 

electrostatic 

precipitator

The average 

opacity must not 

exceed the opacity 

established during 

the performance 

test.Not applicable.

Collecting the hourly and 3-hr 

rolling average opacity 

monitoring data according to 

§63.1572; maintaining the 3-

hr rolling average opacity at 

or above the limit established 

during the performance 

test.Complying with Table 6 of 

this subpart.

2. Subject to NSPS 

for PM in 40 CFR 

60.102a(b)(1)(ii), 

electing to meet the 

PM per coke burnoff limit. 

Any Any See items 1.b, 1.c, 1.d, and 1.e 

of this table. 

3. Subject to NSPS 

for PM in 40 CFR 

60.102a(b)(1), 

electing to meet the 

PM concentration 

limit. 

PM CEMS Not applicable. Complying with Table 6 of this 

subpart.

34. Option 21: PM 

per coke burn-off 

limit, not subject to 

the NSPS for PM in 

40 CFR 60.102. or 

in 40 CFR 

60.102a(b)(1).

a. Continuous 

opacity monitoring 

system. 

The opacity of 

emissions from 

your catalyst 

regenerator vent 

must not exceed 

the site-specific 

opacity operating 

limit established 

during the 

CollectingCollecting the 3-hr 

rolling average continuous 

opacity monitoring system 

data according to §63.1572; 

and maintaining the 3-hr 

rolling average opacity at or 

below the site-specific limit. 

Alternatively, before [THE 

DATE 18 MONTHS AFTER 
89 

For each new or 

existing catalytic 

cracking unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance by . . .

performance test. THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

collecting the hourly average 

continuous opacity monitoring 

system data according to 

§63.1572; and maintaining the 

hourly average opacity at or 

below the site-specific limit. 

 b. Continuous 

parameter 

monitoring 

systems—

electrostatic 

precipitator. 

i. The daily

average gas flow 

rate entering or 

exiting the control 

device must not 

exceed the 

operating limit 

established during 

the performance 

test. 

CollectingCollecting the 

hourly and 3-hr rolling 

average gas flow rate 

monitoring data according to 

§63.1572; and maintaining the 

3-hr rolling average gas flow 

rate at or below the limit 

established during the 

performance test. 

Alternatively, before [THE 

DATE 18 MONTHS AFTER 

THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

collecting the hourly and daily 

average gas flow rate 

monitoring data according to 

§63.15721

; and maintaining the 

daily average gas flow rate at or 

below the limit established 

during the performance test. 

 ii. The daily

average voltage 

and secondary 

current (or total 

power input) to the 

control device must 

not fall below the 

operating limit 

CollectingCollecting the 

hourly and 3-hr rolling 

average total power and 

secondary current monitoring 

data according to §63.1572; 

and maintaining the 3-hr 

rolling average total power 

and secondary current at or 
90 

For each new or 

existing catalytic 

cracking unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance by . . .

established during 

the performance 

test. 

above the limit established 

during the performance test. 

Alternatively, before [THE 

DATE 18 MONTHS AFTER 

THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

collecting the hourly and daily 

average voltage and secondary 

current (or total power input) 

monitoring data according to 

§63.1572; and maintaining the 

daily average voltage and 

secondary current (or total 

power input) at or above the 

limit established during the 

performance test. 

 c. Continuous 

parameter 

monitoring 

systems—wet 

scrubber. 

i. The daily

average pressure 

drop across the 

scrubber must not 

fall below the 

operating limit 

established during 

the performance 

test. 

CollectingCollecting the 

hourly and 3-hr rolling 

average pressure drop 

monitoring data according to 

§63.1572; and maintaining the 

3-hr rolling average pressure 

drop at or above the limit 

established during the 

performance test. 

Alternatively, before [THE 

DATE 18 MONTHS AFTER 

THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

collecting the hourly and daily 

average pressure drop 

monitoring data according to 

§63.1572; and maintaining the 

daily average pressure drop 

above the limit established 

during the performance test. 
91 

For each new or 

existing catalytic 

cracking unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance by . . .

 ii. The daily

average liquid-togas ratio must not 

fall below the 

operating limit 

established during 

the performance 

test. 

CollectingCollecting the 

hourly and 3-hr rolling 

average gas flow rate and 

scrubber liquid flow rate 

monitoring data according to 

§63.1572; determining and 

recording the 3-hr liquid-togas ratio; and maintaining the 

3-hr rolling average liquid-togas ratio at or above the limit 

established during the 

performance test. 

Alternatively, before [THE 

DATE 18 MONTHS AFTER 

THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

collecting the hourly average 

gas flow rate and water (or 

scrubbing liquid) flow rate 

monitoring data according to 

§63.15721; determining and 

recording the hourly average 

liquid-to-gas ratio; determining 

and recording the daily average 

liquid-to-gas ratio; and 

maintaining the daily average 

liquid-to-gas ratio above the 

limit established during the 

performance test. 

d. BLD – fabric 

filter 

Increases in 

relative 

particulate. 

Collecting and maintaining 

records of BLD system 

output; determining the cause 

of the alarm within 1 hour of 

the alarm; and alleviating the 

cause of the alarm within 3 

hours by corrective action. 

e. Continuous 

opacity 

monitoring 

The average 

opacity must not 

exceed the opacity 

Collecting the hourly and 3-hr 

rolling average opacity 

monitoring data according to 
92 

For each new or 

existing catalytic 

cracking unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance by . . .

system, used for 

site-specific 

opacity limit - 

Cyclone or 

electrostatic 

precipitator 

established during 

the performance 

test. 

§63.1572; maintaining the 3-

hr rolling average opacity at 

or above the limit established 

during the performance test. 

5. Option 2: PM 

concentration limit, 

not subject to the 

NSPS for PM in 40 

CFR 60.102 or in 40 

CFR 60.102a(b)(1). 

PM CEMS Not applicable. Complying with Table 6 of 

this subpart. 

46. Option 3: Ni 

lb/hr limit not 

subject to the NSPS 

for PM in 40 CFR 

60.102. 

a. Continuous 

opacity monitoring 

system. 

i. The daily 

average Ni 

operating value 

must not exceed 

the site-specific Ni 

operating limit 

established during 

the performance 

test. 

(1) Collecting the hourly 

average continuous opacity 

monitoring system data 

according to §63.1572; 

determining and recording 

equilibrium catalyst Ni 

concentration at least once a 

week2; collecting the hourly 

average gas flow rate 

monitoring data according to 

§63.15721; and determining and 

recording the hourly average Ni 

operating value using Equation 

11 of §63.1564; determining 

and recording the daily average 

Ni operating value; and 

maintaining the daily average Ni

operating value below the sitespecific Ni operating limit 

established during the 

performance test. 

(2) Determining and recording

the 3-hour rolling average Ni 

operating value and 

maintaining the 3-hour rolling 

average Ni operating value 

below the site-specific Ni 

operating limit established 

during the performance test. 

Alternatively, before [THE 
93 

For each new or 

existing catalytic 

cracking unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance by . . .

DATE 18 MONTHS AFTER 

THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

determining and recording the 

daily average Ni operating 

value and maintaining the 

daily average Ni operating 

value below the site-specific Ni 

operating limit established 

during the performance test. 

 b. Continuous 

parameter 

monitoring 

systems—

electrostatic 

precipitator. 

i. The daily

average gas flow 

rate entering or 

exiting the control 

device must not 

exceed the 

operating limit 

established during 

the performance 

test. 

See item 34.b.i. of this table. 

 ii. The daily

average voltage 

and secondary 

current (or total 

power input) must 

not fall below the 

level established in 

the performance 

test. 

See item 34.b.ii. of this table. 

 iii. The monthly 

rolling average of 

the equilibrium 

catalyst Ni 

concentration must 

not exceed the 

level established 

during the 

performance test. 

Determining and recording the 

equilibrium catalyst Ni 

concentration at least once a 

week2

; determining and 

recording the monthly rolling 

average of the equilibrium 

catalyst Ni concentration once 

each week using the weekly or 

most recent value; and 

maintaining the monthly rolling 
94 

For each new or 

existing catalytic 

cracking unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance by . . .

average below the limit 

established in the performance 

test. 

 c. Continuous 

parameter 

monitoring 

systems—

wetscrubberwet 

scrubber. 

i. The daily

average pressure 

drop must not fall 

below the 

operating limit 

established in the 

performance test. 

See item 34.c.i. of this table. 

 ii. The daily

average liquid-togas ratio must not 

fall below the 

operating limit 

established during 

the performance 

test. 

See item 34.c.ii. of this table. 

 iii. The monthly 

rolling average 

equilibrium 

catalyst Ni 

concentration must 

not exceed the 

level established 

during the 

performance test. 

Determining and recording the 

equilibrium catalyst Ni 

concentration at least once a 

week2; determining and 

recording the monthly rolling 

average of equilibrium catalyst 

Ni concentration once each 

week using the weekly or most 

recent value; and maintaining 

the monthly rolling average 

below the limit established in 

the performance test. 

d. BLD – fabric 

filter 

Increases in 

relative 

particulate. 

See item 4.d of this table. 

e. Continuous 

opacity 

monitoring 

system, used for 

site-specific 

opacity limit - 

Cyclone or 

electrostatic 

The average 

opacity must not 

exceed the opacity 

established during 

the performance 

test. 

See item 4.e of this table. 
95 

For each new or 

existing catalytic 

cracking unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance by . . .

precipitator 

57. Option 4: Ni 

lb/ton ofper coke 

burn-off limit not 

subject to the NSPS 

for PM in 40 CFR 

60.102. 

a. Continuous 

opacity monitoring 

system. 

i. The daily 

average Ni 

operating value 

must not exceed 

the site-specific Ni 

operating limit 

established during 

the performance 

test. 

(1) Collecting the hourly 

average continuous opacity 

monitoring system data 

according to §63.1572; 

collecting the hourly average 

gas flow rate monitoring data 

according to §63.15721; 

determining and recording 

equilibrium catalyst Ni 

concentration at least once a 

week2; and determining and 

recording the hourly average Ni 

operating value using Equation 

12 of §63.1564; determining 

and recording the daily average 

Ni operating value; and 

maintaining the daily average Ni 

operating value below the sitespecific Ni operating limit 

established during the 

performance test. 

(2) Determining and recording

the 3-hour rolling average Ni 

operating value and 

maintaining the 3-hour rolling 

average Ni operating value 

below the site-specific Ni 

operating limit established 

during the performance test. 

Alternatively, before [THE 

DATE 18 MONTHS AFTER 

THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

determining and recording the 

daily average Ni operating 

value and maintaining the 

daily average Ni operating 

value below the site-specific Ni 
96 

For each new or 

existing catalytic 

cracking unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance by . . .

operating limit established 

during the performance test. 

 b. Continuous 

parameter 

monitoring 

systems—

electrostatic 

precipitator. 

i. The daily 

average gas flow 

rate to the control 

device must not 

exceed the level 

established in the 

performance test. 

See item 34.b.i. of this table. 

 ii. The daily 

average voltage 

and secondary 

current (or total 

power input) must 

not fall below the 

level established in 

the performance 

test. 

See item 34.b.ii. of this table. 

 iii. The monthly 

rolling average 

equilibrium 

catalyst Ni 

concentration must 

not exceed the 

level established 

during the 

performance test. 

See item 46.b.iii. of this table. 

 c. Continuous 

parameter 

monitoring 

systems—wet 

scrubber. 

i. The daily 

average pressure 

drop must not fall 

below the 

operating limit 

established in the 

performance test. 

See item 34.c.i. of this table. 

 ii. The daily 

average liquid-togas ratio must not 

fall below the 

operating limit 

established during 

the performance 

See item 34.c.ii. of this table. 
97 

For each new or 

existing catalytic 

cracking unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance by . . .

test. 

 iii. The monthly 

rolling average 

equilibrium 

catalyst Ni 

concentration must 

not exceed the 

level established 

during the 

performance test. 

See item 46.c.iii. of this table. 

d. BLD – fabric 

filter 

Increases in 

relative 

particulate. 

See item 4.d of this table. 

e. Continuous 

opacity 

monitoring 

system, used for 

site-specific 

opacity limit - 

Cyclone or 

electrostatic 

precipitator 

The average 

opacity must not 

exceed the opacity 

established during 

the performance 

test. 

See item 4.e of this table. 

1

If applicable, you can use the alternative in §63.1573(a)(1) for gas flow rate instead of a continuous parameter 

monitoring system if you used the alternative method in the initial performance test. 

2

The equilibrium catalyst Ni concentration must be measured by the procedure, Determination of Metal 

Concentration on Catalyst Particles (Instrumental Analyzer Procedure) in aAppendix A to this subpart; or by EPA 

Method 6010B, Inductively Coupled Plasma-Atomic Emission Spectrometry, EPA Method 6020, Inductively 

Coupled Plasma-Mass Spectrometry, EPA Method 7520, Nickel Atomic Absorption, Direct Aspiration, or EPA 

Method 7521, Nickel Atomic Absorption, Direct Aspiration; or by an alternative to EPA Method 6010B, 6020, 

7520, or 7521 satisfactory to the Administrator. The EPA Methods 6010B, 6020, 7520, and 7521 are included in 

“Test Methods for Evaluating Solid Waste, Physical/Chemical Methods,” EPA Publication SW-846, Revision 5 

(April 1998). The SW-846 and Updates (document number 955-001-00000-1) are available for purchase from the 

Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402, (202) 512-1800; and from 

the National Technical Information Services (NTIS), 5285 Port Royal Road, Springfield, VA 22161, (703) 487-

4650. Copies may be inspected at the EPA Docket Center (Air Docket), William Jefferson Clinton (WJC) EPA

West Building (Air Docket), Room 3334B-108, 1301 Constitution Ave., NW., Washington, DC; or at the Office of 

the Federal Register, 800 North Capitol Street, NW., Suite 700, Washington, DC. These methods are also available 

at http://www.epa.gov/epaoswer/hazwaste/test/main.htm. 

Table 8 to Subpart UUU of Part 63—Organic HAP Emission Limits for Catalytic Cracking 

Units 
98 

As stated in §63.1565(a)(1), you shall meet each emission limitation in the following table that 

applies to you. 

For each new and 

existing catalytic 

cracking unit . . . 

You shall meet the following emission limit for each catalyst 

regenerator vent . . . 

1. Subject to the NSPS for 

carbon monoxide (CO) in 

40 CFR 60.103 

CO emissions from the catalyst regenerator vent or CO boiler 

serving the catalytic cracking unit must not exceed 500 parts per 

million volume (ppmv) (dry basis). 

2. Not subject to the 

NSPS for CO in 40 CFR 

60.103 

a. CO emissions from the catalyst regenerator vent or CO boiler 

serving the catalytic cracking unit must not exceed 500 ppmv (dry 

basis). 

b. If you use a flare to meet the CO limit, then on and after [THE 

DATE 3 YEARS AFTER THE DATE OF PUBLICATION OF 

THE FINAL RULE AMENDMENTS IN THE FEDERAL 

REGISTER], the flare must meet the requirements of §63.670. 

Prior to [THE DATE 3 YEARS AFTER THE DATE OF 

PUBLICATION OF THE FINAL RULE AMENDMENTS IN 

THE FEDERAL REGISTER], the flare must meet the 

requirements for control devices in §63.11(b): and visible emissions 

must not exceed a total of 5 minutes during any 2 consecutive hours, 

or the flare must meet the requirements of §63.670. 

Table 9 to Subpart UUU of Part 63—Operating Limits for Organic HAP Emissions From 

Catalytic Cracking Units 

As stated in §63.1565(a)(2), you shall meet each operating limit in the following table that 

applies to you. 

For each new 

or existing 

catalytic 

cracking unit 

. . . 

For this type 

of continuous 

monitoring 

system . . . 

For this type of 

control device . . . 

You shall meet this operating limit . . 

. 

1. Subject to 

the NSPS for 

carbon 

monoxide 

(CO) in 40 

CFR 60.103 

Continuous 

emission 

monitoring 

system. 

Not applicable Not applicable. 

2. Not subject 

to the NSPS 

for CO in 40 

CFR 60.103 

a. Continuous 

emission 

monitoring 

system. 

Not applicable Not applicable. 
99 

For each new 

or existing 

catalytic 

cracking unit 

. . . 

For this type 

of continuous 

monitoring 

system . . . 

For this type of 

control device . . . 

You shall meet this operating limit . . 

. 

 b. Continuous 

parameter 

monitoring 

systems. 

i. Thermal incinerator Maintain the daily average combustion 

zone temperature above the limit 

established during the performance test; 

and maintain the daily average oxygen 

concentration in the vent stream 

(percent, dry basis) above the limit 

established during the performance test. 

 ii. Boiler or process 

heater with a design 

heat input capacity 

under 44 MW or a 

boiler or process 

heater in which all 

vent streams are not 

introduced into the 

flame zone. 

Maintain the daily average combustion 

zone temperature above the limit 

established in the performance test. 

 iii. Flare TheOn and after [THE DATE 3 

YEARS AFTER THE DATE OF 

PUBLICATION OF THE FINAL 

RULE AMENDMENTS IN THE 

FEDERAL REGISTER], the flare 

must meet the requirements of 

§63.670. Prior to [THE DATE 3 

YEARS AFTER THE DATE OF 

PUBLICATION OF THE FINAL 

RULE AMENDMENTS IN THE 

FEDERAL REGISTER], the flare pilot 

light must be present at all times and the 

flare must be operating at all times that 

emissions may be vented to it, or the 

flare must meet the requirements of 

§63.670. 

Table 10 to Subpart UUU of Part 63—Continuous Monitoring Systems for Organic HAP 

Emissions From Catalytic Cracking Units 

As stated in §63.1565(b)(1), you shall meet each requirement in the following table that applies 

to you. 
100 

For each new 

or existing 

catalytic 

cracking unit . 

. . 

And you use this type of 

control device for your 

vent . . . 

You shall install, operate, and maintain this 

type of continuous monitoring system . . . 

1. Subject to the 

NSPS for 

carbon 

monoxide (CO) 

in 40 CFR 

60.103. 

Not applicable Continuous emission monitoring system to 

measure and record the concentration by volume 

(dry basis) of CO emissions from each catalyst 

regenerator vent. 

2. Not subject 

to the NSPS for 

CO in 40 CFR 

60.103 

a. Thermal incinerator Continuous emission monitoring system to 

measure and record the concentration by volume 

(dry basis) of CO emissions from each catalyst 

regenerator vent; or continuous parameter 

monitoring systems to measure and record the 

combustion zone temperature and oxygen content 

(percent, dry basis) in the incinerator vent stream. 

 b. Process heater or boiler 

with a design heat input 

capacity under 44 MW or 

process heater or boiler in 

which all vent streams are 

not introduced into the 

flame zone. 

Continuous emission monitoring system to 

measure and record the concentration by volume 

(dry basis) of CO emissions from each catalyst 

regenerator vent; or continuous parameter 

monitoring systems to measure and record the 

combustion zone temperature. 

 c. Flare MonitoringOn and after [THE DATE 3 YEARS 

AFTER THE DATE OF PUBLICATION OF 

THE FINAL RULE AMENDMENTS IN THE 

FEDERAL REGISTER], the monitoring 

systems required in §§63.670 and 63.671. Prior 

to [THE DATE 3 YEARS AFTER THE DATE 

OF PUBLICATION OF THE FINAL RULE 

AMENDMENTS IN THE FEDERAL 

REGISTER], monitoring device such as a 

thermocouple, an ultraviolet beam sensor, or 

infrared sensor to continuously detect the presence 

of a pilot flame, or the monitoring systems 

required in §§63.670 and 63.671. 

 d. No control device Continuous emission monitoring system to 

measure and record the concentration by volume 

(dry basis) of CO emissions from each catalyst 

regenerator vent. 
101 

Table 11 to Subpart UUU of Part 63—Requirements for Performance Tests for Organic 

HAP Emissions From Catalytic Cracking Units Not Subject to New Source Performance 

Standard (NSPS) for Carbon Monoxide (CO) 

As stated in §63.1565(b)(2) and (3), you shall meet each requirement in the following table that 

applies to you. 

For . . . You must . . . Using . . . 

According to these 

requirements . . . 

1. Each new or 

existing catalytic 

cracking unit 

catalyst regenerator 

vent. 

a. Select sampling port's 

location and the number 

of traverse ports. 

Method 1 or 1A in 

appendix A to part 60 of 

this chapter. 

Sampling sites must be 

located at the outlet of the 

control device or the outlet 

of the regenerator, as 

applicable, and prior to any 

releases to the atmosphere. 

 b. Determine velocity 

and volumetric flow 

rate. 

Method 2, 2A, 2D, 2F, 

or 2G in appendix A to 

part 60 of this chapter, 

as applicable. 

 c. Conduct gas 

molecular weight 

analysis. 

Method 3, 3A, or 3B in 

appendix A to part 60 of 

this chapter, as 

applicable. 

 d. Measure moisture 

content of the stack gas. 

Method 4 in appendix A 

to part 60 of this 

chapter. 

2. For each new or 

existing catalytic 

cracking unit 

catalyst regenerator 

vent if you use a 

continuous 

emission 

monitoring system. 

Measure CO emissions Data from your 

continuous emission 

monitoring system. 

Collect CO monitoring data 

for each vent for 24 

consecutive operating 

hours; and reduce the 

continuous emission 

monitoring data to 1-hour 

averages computed from 

four or more data points 

equally spaced over each 1-

hour period. 

3. Each catalytic 

cracking unit 

catalyst regenerator 

vent if you use 

continuous 

parameter 

monitoring 

systems. 

a. Measure the CO 

concentration (dry 

basis) of emissions 

exiting the control 

device. 

Method 10, 10A, or 10B 

in appendix A to part 60 

of this chapter, as 

applicable. 
102 

For . . . You must . . . Using . . . 

According to these 

requirements . . . 

 b. Establish each 

operating limit in Table 

9 of this subpart that 

applies to you. 

Data from the 

continuous parameter 

monitoring systems. 

 c. Thermal incinerator 

combustion zone 

temperature. 

Data from the 

continuous parameter 

monitoring systems. 

Collect temperature 

monitoring data every 15 

minutes during the entire 

period of the CO initial 

performance test; and 

determine and record the 

minimum hourly average 

combustion zone 

temperature from all the 

readings. 

 d. Thermal incinerator: 

oxygen, content 

(percent, dry basis) in 

the incinerator vent 

stream. 

Data from the 

continuous parameter 

monitoring systems. 

Collect oxygen 

concentration (percent, dry 

basis) monitoring data 

every 15 minutes during 

the entire period of the CO 

initial performance test; 

and determine and record 

the minimum hourly 

average percent excess 

oxygen concentration from 

all the readings. 

 e. If you use a process 

heater or boiler with a 

design heat input 

capacity under 44 MW 

or process heater or 

boiler in which all vent 

streams are not 

introduced into the 

flame zone, establish 

operating limit for 

combustion zone 

temperature. 

Data from the 

continuous parameter 

monitoring systems. 

Collect the temperature 

monitoring data every 15 

minutes during the entire 

period of the CO initial 

performance test; and 

determine and record the 

minimum hourly average 

combustion zone 

temperature from all the 

readings. 

 f. If you use a flare, 

conduct visible emission 

observations. 

Method 22 (40 CFR 

part 60, appendix A). 

MaintainOn and after 

[THE DATE 3 YEARS 

AFTER THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 
103 

For . . . You must . . . Using . . . 

According to these 

requirements . . . 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

meet the requirements of 

§63.670. Prior to [THE 

DATE 3 YEARS AFTER 

THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

maintain a 2-hour 

observation period; and 

record the presence of a 

flame at the pilot light over 

the full period of the test or 

meet the requirements of 

§63.670. 

 g. If you use a flare, 

determine that the flare 

meets the requirements 

for net heating value of 

the gas being combusted 

and exit velocity. 

40 CFR 6063.11(b)(6)

through (8). 

On and after [THE 

DATE 3 YEARS AFTER 

THE DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

the flare must meet the 

requirements of §63.670. 

Prior to [THE DATE 3 

YEARS AFTER THE 

DATE OF 

PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

the flare must meet the 

control device 

requirements in §63.11(b) 

or the requirements of 

§63.670.

Table 12 to Subpart UUU of Part 63—Initial Compliance With Organic HAP Emission 

Limits for Catalytic Cracking Units 
104 

As stated in §63.1565(b)(4), you shall meet each requirement in the following table that applies 

to you. 

For each new 

and existing 

catalytic 

cracking unit . 

. . 

For the following 

emission limit . . . You have demonstrated initial compliance if . . .

1. Subject to the 

NSPS for 

carbon 

monoxide (CO) 

in 40 CFR 

60.103 

CO emissions from your 

catalyst regenerator vent 

or CO boiler serving the 

catalytic cracking unit 

must not exceed 500 

ppmv (dry basis). 

You have already conducted a performance test to 

demonstrate initial compliance with the NSPS and 

the measured CO emissions are less than or equal to 

500 ppm (dry basis). As part of the Notification of 

Compliance Status, you must certify that your vent 

meets the CO limit. You are not required to conduct 

another performance test to demonstrate initial 

compliance. You have already conducted a 

performance evaluation to demonstrate initial 

compliance with the applicable performance 

specification. As part of your Notification of 

Compliance Status, you must certify that your 

continuous emission monitoring system meets the 

applicable requirements in §63.1572. You are not 

required to conduct another performance evaluation 

to demonstrate initial compliance. 

2. Not subject to 

the NSPS for 

CO in 40 CFR 

60.103 

a. CO emissions from 

your catalyst regenerator 

vent or CO boiler serving 

the catalytic cracking 

unit must not exceed 500 

ppmv (dry basis). 

i. If you use a continuous parameter monitoring 

system, the average CO emissions measured by 

Method 10 over the period of the initial 

performance test are less than or equal to 500 ppmv 

(dry basis). 

 ii. If you use a continuous emission monitoring 

system, the hourly average CO emissions over the 

24-hour period for the initial performance test are 

not more than 500 ppmv (dry basis); and your 

performance evaluation shows your continuous 

emission monitoring system meets the applicable 

requirements in §63.1572. 

 b. If you use a flare, 

visible emissions must 

not exceed a total of 5 

minutes during any 2 

operating hours. 

VisibleOn and after [THE DATE 3 YEARS 

AFTER THE DATE OF PUBLICATION OF 

THE FINAL RULE AMENDMENTS IN THE 

FEDERAL REGISTER], the flare meets the 

requirements of §63.670. Prior to [THE DATE 3 

YEARS AFTER THE DATE OF 

PUBLICATION OF THE FINAL RULE 

AMENDMENTS IN THE FEDERAL 
105 

For each new 

and existing 

catalytic 

cracking unit . 

. . 

For the following 

emission limit . . . You have demonstrated initial compliance if . . .

REGISTER], visible emissions, measured by 

Method 22 during the 2-hour observation period 

during the initial performance test, are no higher 

than 5 minutes, or the flare meets the 

requirements of §63.670.

Table 13 to Subpart UUU of Part 63—Continuous Compliance With Organic HAP 

Emission Limits for Catalytic Cracking Units 

As stated in §63.1565(c)(1), you shall meet each requirement in the following table that applies 

to you. 

For each new 

and existing 

catalytic 

cracking unit 

. . . 

Subject to this 

emission limit for your 

catalyst regenerator 

vent . . . 

If you must 

. . . 

You shall demonstrate continuous 

compliance by . . . 

1. Subject to 

the NSPS for 

carbon 

monoxide 

(CO) in 40 

CFR 60.103 

CO emissions from your 

catalyst regenerator vent 

or CO boiler serving the 

catalytic cracking unit 

must not exceed 500 

ppmv (dry basis). 

Continuous 

emission 

monitoring 

system 

Collecting the hourly average CO 

monitoring data according to §63.1572; 

and maintaining the hourly average CO 

concentration at or below 500 ppmv (dry 

basis). 

2. Not subject 

to the NSPS 

for CO in 40 

CFR 60.103 

i. CO emissions from 

your catalyst 

regenerator vent or CO 

boiler serving the 

catalytic cracking unit 

must not exceed 500 

ppmv (dry basis). 

Continuous 

emission 

monitoring 

system. 

Same as above. 

 ii. CO emissisons from 

your catalyst 

regenerator vent or CO 

boiler serving the 

catalytic cracking unit 

must not exceed 500 

ppmv (dry basis). 

Continuous 

parameter 

monitoring 

system. 

Maintaining the hourly average CO 

concentration below 500 ppmv (dry 

basis). 
106 

For each new 

and existing 

catalytic 

cracking unit 

. . . 

Subject to this 

emission limit for your 

catalyst regenerator 

vent . . . 

If you must 

. . . 

You shall demonstrate continuous 

compliance by . . . 

 iii. Visible emissions 

from a flare must not 

exceed a total of 5 

minutes during any 2-

hour period. 

Control 

device-flare 

MaintainingOn and after [THE DATE 

3 YEARS AFTER THE DATE OF 

PUBLICATION OF THE FINAL 

RULE AMENDMENTS IN THE 

FEDERAL REGISTER], meeting the 

requirements of §63.670. Prior to 

[THE DATE 3 YEARS AFTER THE 

DATE OF PUBLICATION OF THE 

FINAL RULE AMENDMENTS IN 

THE FEDERAL REGISTER], 

maintaining visible emissions below a 

total of 5 minutes during any 2-hour 

operating period, or meeting the 

requirements of §63.670. 

Table 14 to Subpart UUU of Part 63—Continuous Compliance With Operating Limits for 

Organic HAP Emissions From Catalytic Cracking Units 

As stated in §63.1565(c)(1), you shall meet each requirement in the following table that applies 

to you. 

For each 

new existing

catalytic 

cracking 

unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance by . . . 

1. Subject to 

NSPS for 

carbon 

monoxide 

(CO) in 40 

CFR 60.103 

Continuous emission 

monitoring system. 

Not applicable Complying with Table 13 of this 

subpart. 

2. Not 

subject to 

the NSPS for 

CO in 40 

CFR 60.103 

a. Continuous 

emission monitoring 

system 

Not applicable Complying with Table 13 of this 

subpart. 
107 

For each 

new existing

catalytic 

cracking 

unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance by . . . 

 b. Continuous 

parameter monitoring 

systems—thermal 

incinerator. 

i. The daily average 

combustion zone 

temperature must not 

fall below the level 

established during 

the performance test.

Collecting the hourly and daily 

average temperature monitoring 

data according to §63.1572; and 

maintaining the daily average 

combustion zone temperature 

above the limit established during 

the performance test. 

 ii. The daily average 

oxygen concentration 

in the vent stream 

(percent, dry basis) 

must not fall below 

the level established 

during the 

performance test. 

Collecting the hourly and daily 

average oxygen concentration 

monitoring data according to 

§63.1572; and maintaining the 

daily average oxygen concentration 

above the limit established during 

the performance test. 

 c. Continuous 

parameter monitoring 

systems—boiler or 

process heater with a 

design heat input 

capacity under 44 MW 

or boiler or process 

heater in which all 

vent streams are not 

introduced into the 

flame zone. 

The daily 

combustion zone 

temperature must not 

fall below the level 

established in the 

performance test. 

Collecting the average hourly and 

daily temperature monitoring data 

according to §63.1572; and 

maintaining the daily average 

combustion zone temperature 

above the limit established during 

the performance test. 

 d. Continuous 

parameter monitoring 

system—flare. 

The flare pilot light 

must be present at all 

times and the flare 

must be operating at 

all times that 

emissions may be 

vented to it. 

CollectingOn and after [THE 

DATE 3 YEARS AFTER THE 

DATE OF PUBLICATION OF 

THE FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

meeting the requirements of 

§63.670. Prior to [THE DATE 3 

YEARS AFTER THE DATE OF 

PUBLICATION OF THE 

FINAL RULE AMENDMENTS 

IN THE FEDERAL 

REGISTER], collecting the flare 

monitoring data according to 
108 

For each 

new existing

catalytic 

cracking 

unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance by . . . 

§63.1572; and recording for each 

1-hour period whether the monitor 

was continuously operating and the 

pilot light was continuously present 

during each 1-hour period, or 

meeting the requirements of 

§63.670. 

Table 15 to Subpart UUU of Part 63—Organic HAP Emission Limits for Catalytic 

Reforming Units 

As stated in §63.1566(a)(1), you shall meet each emission limitation in the following table that 

applies to you. 

For each applicable 

process vent for a new 

or existing catalytic 

reforming unit . . . 

You shall meet this emission limit during initial catalyst 

depressuring and catalyst purging operations . . . 

1. Option 1 VentOn and after [THE DATE 3 YEARS AFTER THE DATE OF 

PUBLICATION OF THE FINAL RULE AMENDMENTS IN 

THE FEDERAL REGISTER], vent emissions to a flare that meets 

the requirements of §63.670. Prior to [THE DATE 3 YEARS 

AFTER THE DATE OF PUBLICATION OF THE FINAL RULE 

AMENDMENTS IN THE FEDERAL REGISTER], vent emissions 

to a flare that meets the requirements for control devices in §63.11(b). 

Visible and visible emissions from a flare must not exceed a total of 5 

minutes during any 2-hour operating period, or vent emissions to a 

flare that meets the requirements of §63.670. 

2. Option 2 Reduce uncontrolled emissions of total organic compounds (TOC) or 

nonmethane TOC from your process vent by 98 percent by weight 

using a control device or to a concentration of 20 ppmv (dry basis as 

hexane), corrected to 3 percent oxygen, whichever is less stringent. If 

you vent emissions to a boiler or process heater to comply with the 

percent reduction or concentration emission limitation, the vent stream 

must be introduced into the flame zone, or any other location that will 

achieve the percent reduction or concentration standard. 
109 

Table 16 to Subpart UUU of Part 63—Operating Limits for Organic HAP Emissions From 

Catalytic Reforming Units 

As stated in §63.1566(a)(2), you shall meet each operating limit in the following table that 

applies to you. 

For each new or 

existing 

catalytic 

reforming unit . 

. . 

For this type of control 

device . . . 

You shall meet this operating limit during 

initial catalyst depressuring and purging 

operations. . . 

1. Option 1: vent 

to flare 

Flare that meets the 

requirements for control 

devices in §63.11(b)

TheOn and after [THE DATE 3 YEARS 

AFTER THE DATE OF PUBLICATION 

OF THE FINAL RULE AMENDMENTS 

IN THE FEDERAL REGISTER], the flare 

must meet the requirements of §63.670. 

Prior to [THE DATE 3 YEARS AFTER 

THE DATE OF PUBLICATION OF THE 

FINAL RULE AMENDMENTS IN THE 

FEDERAL REGISTER], the flare pilot light 

must be present at all times and the flare must 

be operating at all times that emissions may be 

vented to it, or the flare must meet the 

requirements of §63.670. 

2. Option 2: 

Percent reduction 

or concentration 

limit 

a. Thermal incinerator, boiler 

or process heater with a 

design heat input capacity 

under 44 MW, or boiler or 

process heater in which all 

vent streams are not 

introduced into the flame 

zone 

The daily average combustion zone 

temperature must not fall below the limit 

established during the performance test. 

 b. No control device Operate at all times according to your 

operation, maintenance, and monitoring plan 

regarding minimum catalyst purging 

conditions that must be met prior to allowing 

uncontrolled purge releases. 

Table 17 to Subpart UUU of Part 63—Continuous Monitoring Systems for Organic HAP 

Emissions From Catalytic Reforming Units 

As stated in §63.1566(b)(1), you shall meet each requirement in the following table that applies 

to you. 
110 

For each 

applicable process 

vent for a new or 

existing catalytic 

reforming unit . . 

. 

If you use this type of 

control device . . . 

You shall install and operate this type of 

continuous monitoring system . . . 

1. Option 1: vent to 

a flare 

Flare that meets the 

requirements for control 

devices in §63.11(b)

MonitoringOn and after [THE DATE 3 

YEARS AFTER THE DATE OF 

PUBLICATION OF THE FINAL RULE 

AMENDMENTS IN THE FEDERAL 

REGISTER], the monitoring systems 

required in §§63.670 and 63.671. Prior to 

[THE DATE 3 YEARS AFTER THE 

DATE OF PUBLICATION OF THE 

FINAL RULE AMENDMENTS IN THE 

FEDERAL REGISTER], monitoring

device such as a thermocouple, an ultraviolet 

beam sensor, or infrared sensor to 

continuously detect the presence of a pilot 

flame, or the monitoring systems required 

in §§63.670 and 63.671. 

2. Option 2: percent 

reduction or 

concentration limit. 

Thermal incinerator, 

process heater or boiler with 

a design heat input capacity 

under 44 MW, or process 

heater or boiler in which all 

vent streams are not 

introduced into the flame 

zone 

Continuous parameter monitoring systems to 

measure and record the combustion zone 

temperature. 

Table 18 to Subpart UUU of Part 63—Requirements for Performance Tests for Organic 

HAP Emissions From Catalytic Reforming Units 

As stated in §63.1566(b)(2) and (3), you shall meet each requirement in the following table that 

applies to you. 
111 

For each new 

or existing 

catalytic 

reforming 

unit . . . You must . . . Using . . . 

According to these 

requirements . . . 

1. Option 1: 

Vent to a flare 

a. Conduct visible 

emission observations 

Method 22 (40 CFR 

part 60, appendix A) 

On and after [THE DATE 3 

YEARS AFTER THE 

DATE OF PUBLICATION 

OF THE FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

the flare must meet the 

requirements of §63.670. 

Prior to [THE DATE 3 

YEARS AFTER THE 

DATE OF PUBLICATION 

OF THE FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER],2-

hour observation period. 

Record the presence of a 

flame at the pilot light over 

the full period of the test, or 

the requirements of §63.670.

 b. Determine that the 

flare meets the 

requirements for net 

heating value of the gas 

being combusted and 

exit velocity 

40 CFR 63.11(b)(6) 

through (8).Not 

applicable.

On and after [THE DATE 3 

YEARS AFTER THE 

DATE OF PUBLICATION 

OF THE FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

the flare must meet the 

requirements of §63.670. 

Prior to [THE DATE 3 

YEARS AFTER THE 

DATE OF PUBLICATION 

OF THE FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

the flare must meet the 

control device requirements 

in §63.11(b) or the 

requirements of §63.670. 40 

CFR 63.11(b)(6) through (8).
112 

For each new 

or existing 

catalytic 

reforming 

unit . . . You must . . . Using . . . 

According to these 

requirements . . . 

2. Option 2: 

Percent 

reduction or 

concentration 

limit 

a. Select sampling site Method 1 or 1A (40 

CFR part 60, appendix 

A). No traverse site 

selection method is 

needed for vents 

smaller than 0.10 meter 

in diameter. 

Sampling sites must be 

located at the inlet (if you 

elect the emission reduction 

standard) and outlet of the 

control device and prior to 

any releases to the 

atmosphere. 

 b. Measure gas 

volumetric flow rate 

Method 2, 2A, 2C, 2D, 

2F, or 2G (40 CFR part 

60, appendix A), as 

applicable 

 c. Measure TOC 

concentration (for 

percent reduction 

standard) 

Method 25 (40 part 60, 

appendix A) to measure 

nonmethane TOC 

concentration (in 

carbon equivalents) at 

inlet and outlet of the 

control device. If the 

nonmethane TOC 

outlet concentration is 

expected to be less than 

50 ppm (as carbon), 

you can use Method 

25A to measure TOC 

concentration (as 

hexane) at the inlet and 

the outlet of the control 

device. If you use 

Method 25A, you may 

use Method 18 (40 

CFR part 60, appendix 

A) to measure the 

methane concentration 

to determine the 

nonmethane TOC 

concentration 

Take either an integrated 

sample or four grab samples 

during each run. If you use a 

grab sampling technique, take 

the samples at approximately 

equal intervals in time, such 

as 15-minute intervals during 

the run. 

 d. Calculate TOC or 

nonmethane TOC 

emission rate and mass 

emission reduction 

 Calculate emission rate by 

Equation 1 of §63.1566 (if 

you use Method 25) or 

Equation 2 of §63.1566 (if 
113 

For each new 

or existing 

catalytic 

reforming 

unit . . . You must . . . Using . . . 

According to these 

requirements . . . 

you use Method 25A). 

Calculate mass emission 

reduction by Equation 3 of 

§63.1566. 

 e. For concentration 

standard, measure TOC 

concentration. 

(Optional: Measure 

methane concentration.)

Method 25A (40 CFR 

part 60, appendix A) to 

measure TOC 

concentration (as 

hexane) at the outlet of 

the control device. You 

may elect to use 

Method 18 (40 CFR 

part 60, appendix A) to 

measure the methane 

concentration 

 f. Determine oxygen 

content in the gas 

stream at the outlet of 

the control device 

Method 3A or 3B (40 

CFR part 60, appendix 

A), as applicable 

 g. Calculate the TOC or 

nonmethane TOC 

concentration corrected 

for oxygen content (for 

concentration standard) 

Equation 4 of §63.1566 

 h. Establish each 

operating limit in Table 

16 of this subpart that 

applies to you for a 

thermal incinerator, or 

process heater or boiler 

with a design heat input 

capacity under 44 MW, 

or process heater or 

boiler in which all vent 

streams are not 

introduced into flame 

zone 

Data from the 

continuous parameter 

monitoring systems 

Collect the temperature 

monitoring data every 15 

minutes during the entire 

period of the initial TOC 

performance test. Determine 

and record the minimum 

hourly average combustion 

zone temperature. 
114 

For each new 

or existing 

catalytic 

reforming 

unit . . . You must . . . Using . . . 

According to these 

requirements . . . 

 i. If you do not use a 

control device, 

document the purging 

conditions used prior to 

testing following the 

minimum requirements 

in the operation, 

maintenance, and 

monitoring plan. 

Data from monitoring 

systems as identified in 

the operation, 

maintenance, and 

monitoring plan 

Procedures in the operation, 

maintenance, and monitoring 

plan. 

Table 19 to Subpart UUU of Part 63—Initial Compliance With Organic HAP Emission 

Limits for Catalytic Reforming Units 

As stated in §63.1566(b)(7), you shall meet each requirement in the following table that applies 

to you. 

For each 

applicable 

process vent for a 

new or existing 

catalytic 

reforming unit 

. . . 

For the following emission 

limit . . . 

You have demonstrated initial 

compliance if . . . 

Option 1 Visible emissions from a flare 

must not exceed a total of 5 

minutes during any 2 

consecutive hours 

VisibleOn and after [THE DATE 3 

YEARS AFTER THE DATE OF 

PUBLICATION OF THE FINAL 

RULE AMENDMENTS IN THE 

FEDERAL REGISTER], the flare meets 

the requirements of §63.670. Prior to 

[THE DATE 3 YEARS AFTER THE 

DATE OF PUBLICATION OF THE 

FINAL RULE AMENDMENTS IN 

THE FEDERAL REGISTER], visible

emissions, measured using Method 22 over 

the 2-hour observation period of the 

performance test, do not exceed a total of 5 

minutes, or the flare meets the 

requirements of §63.670. 
115 

For each 

applicable 

process vent for a 

new or existing 

catalytic 

reforming unit 

. . . 

For the following emission 

limit . . . 

You have demonstrated initial 

compliance if . . . 

Option 2 Reduce uncontrolled emissions 

of total organic compounds 

(TOC) or nonmethane TOC 

from your process vent by 98 

percent by weight using a 

control device or to a 

concentration of 20 ppmv (dry 

basis as hexane), corrected to 3 

percent oxygen, whichever is 

less stringent 

The mass emission reduction of 

nonmethane TOC measured by Method 25 

over the period of the performance test is 

at least 98 percent by weight as calculated 

using Equations 1 and 3 of §63.1566; or 

the mass emission reduction of TOC 

measured by Method 25A (or nonmethane 

TOC measured by Methods 25A and 18) 

over the period of the performance test is 

at least 98 percent by weight as calculated 

using Equations 2 and 3 of §63.1566; or 

the TOC concentration measured by 

Method 25A (or the nonmethane TOC 

concentration measured by Methods 25A 

and 18) over the period of the performance 

test does not exceed 20 ppmv (dry basis as 

hexane) corrected to 3 percent oxygen as 

calculated using Equation 4 of §63.1566. 

Table 20 to Subpart UUU of Part 63—Continuous Compliance With Organic HAP 

Emission Limits for Catalytic Reforming Units 

As stated in §63.1566(c)(1), you shall meet each requirement in the following table that applies 

to you. 

For each 

applicable 

process vent for 

a new or 

existing 

catalytic 

reforming unit . 

. . For this emission limit . . . 

You shall demonstrate continuous 

compliance during initial catalyst 

depressuring and catalyst purging 

operations by . . . 

1. Option 1 Vent emissions from your process 

vent to a flare that meets the 

requirements in §63.11(b)..

MaintainingOn and after [THE DATE 3 

YEARS AFTER THE DATE OF 

PUBLICATION OF THE FINAL 

RULE AMENDMENTS IN THE 

FEDERAL REGISTER], meeting the 
116 

For each 

applicable 

process vent for 

a new or 

existing 

catalytic 

reforming unit . 

. . For this emission limit . . . 

You shall demonstrate continuous 

compliance during initial catalyst 

depressuring and catalyst purging 

operations by . . . 

requirements of §63.670. Prior to [THE 

DATE 3 YEARS AFTER THE DATE 

OF PUBLICATION OF THE FINAL 

RULE AMENDMENTS IN THE 

FEDERAL REGISTER], maintaining

visible emissions from a flare below a 

total of 5 minutes during any 2 

consecutive hours, or meeting the 

requirements of §63.670. 

2. Option 2 Reduce uncontrolled emissions of 

total organic compounds (TOC) or 

nonmethane TOC from your 

process vent by 98 percent by 

weight using a control device or to 

a concentration of 20 ppmv (dry 

basis as hexane), corrected to 3 

percent oxygen, whichever is less 

stringent. 

Maintaining a 98 percent by weight 

emission reduction of TOC or nonmethane 

TOC; or maintaining a TOC or 

nonmethane TOC concentration of not 

more than 20 ppmv (dry basis as hexane), 

corrected to 3 percent oxygen, whichever 

is less stringent. 

Table 21 to Subpart UUU of Part 63—Continuous Compliance With Operating Limits for 

Organic HAP Emissions From Catalytic Reforming Units 

As stated in §63.1566(c)(1), you shall meet each requirement in the following table that applies 

to you. 

For each 

applicable 

process vent 

for a new or 

existing 

catalytic 

reforming 

unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance during 

initial catalyst depressuring 

and purging operations by . . .

1. Option 1 Flare that meets the 

requirements in 

§63.11(b)

The flare pilot light 

must be present at all 

times and the flare 

On and after [THE DATE 3 

YEARS AFTER THE DATE 

OF PUBLICATION OF THE 
117 

For each 

applicable 

process vent 

for a new or 

existing 

catalytic 

reforming 

unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance during 

initial catalyst depressuring 

and purging operations by . . .

must be operating at 

all times that 

emissions may be 

vented to it 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

meeting the requirements of 

§63.670. Prior to [THE DATE 3 

YEARS AFTER THE DATE 

OF PUBLICATION OF THE 

FINAL RULE 

AMENDMENTS IN THE 

FEDERAL REGISTER], 

cCollecting flare monitoring data 

according to §63.1572; and 

recording for each 1-hour period 

whether the monitor was 

continuously operating and the 

pilot light was continuously 

present during each 1-hour 

period, or meeting the 

requirements of §63.670. 

2. Option 2 a. Thermal 

incinerator boiler or 

process heater with a 

design input capacity 

under 44 MW or 

boiler or process 

heater in which not 

all vent streams are 

not introduced into 

the flame zone 

Maintain the daily 

average combustion 

zone temperature 

above the limit 

established during the 

performance test 

Collecting, the hourly and daily 

temperature monitoring data 

according to §63.1572; and 

maintaining the daily average 

combustion zone temperature 

above the limit established during 

the performance test. 

 b. No control device Operate at all times 

according to your 

operation, 

maintenance, and 

monitoring plan 

regarding minimum 

purging conditions 

that must be met prior 

Recording information to 

document compliance with the 

procedures in your operation, 

maintenance, and monitoring 

plan. 
118 

For each 

applicable 

process vent 

for a new or 

existing 

catalytic 

reforming 

unit . . . If you use . . . 

For this operating 

limit . . . 

You shall demonstrate 

continuous compliance during 

initial catalyst depressuring 

and purging operations by . . .

to allowing 

uncontrolled purge 

releases 

Table 22 to Subpart UUU of Part 63—Inorganic HAP Emission Limits for Catalytic 

Reforming Units 

As stated in §63.1567(a)(1), you shall meet each emission limitation in the following table that 

applies to you. 

For . . . 

You shall meet this emission limit for each applicable 

catalytic reforming unit process vent during coke burnoff and catalyst rejuvenation . . . 

1. Each existing semiregenerative catalytic reforming 

unit 

Reduce uncontrolled emissions of hydrogen chloride (HCl) 

by 92 percent by weight or to a concentration of 30 ppmv 

(dry basis), corrected to 3 percent oxygen. 

2. Each existing cyclic or 

continuous catalytic reforming 

unit 

Reduce uncontrolled emissions of HCl by 97 percent by 

weight or to a concentration of 10 ppmv (dry basis), corrected 

to 3 percent oxygen. 

3. Each new semi-regenerative, 

cyclic, or continuous catalytic 

reforming unit 

Reduce uncontrolled emissions of HCl by 97 percent by 

weight or to a concentration of 10 ppmv (dry basis), corrected 

to 3 percent oxygen. 

Table 23 to Subpart UUU of Part 63—Operating Limits for Inorganic HAP Emission 

Limitations for Catalytic Reforming Units 

As stated in §63.1567(a)(2), you shall meet each operating limit in the following table that 

applies to you. 
119 

For each applicable process 

vent for a new or existing 

catalytic reforming unit with 

this type of control device . . 

. 

You shall meet this operating limit during coke burn-off and 

catalyst rejuvenation . . . 

1. Wet scrubber The daily average pH or alkalinity of the water (or scrubbing 

liquid) exiting the scrubber must not fall below the limit 

established during the performance test; and the daily average 

liquid-to-gas ratio must not fall below the limit established 

during the performance test. 

2. Internal scrubbing system 

or no control device (e.g., hot 

regen system) meeting outlet 

HCl concentration limit. 

The daily average HCl concentration in the catalyst regenerator 

exhaust gas must not exceed the limit established during the 

performance test. 

3. Internal scrubbing system 

meeting HCl percent reduction 

standard. 

The daily average pH or alkalinity of the water (or scrubbing 

liquid) exiting the internal scrubbing system must not fall below 

the limit established during the performance test; and the daily 

average liquid-to-gas ratio must not fall below the limit 

established during the performance test. 

4. Fixed-bed gas-solid 

adsorption system 

The daily average temperature of the gas entering or exiting the 

adsorption system must not exceed the limit established during 

the performance test; and the HCl concentration in the 

adsorption system exhaust gas must not exceed the limit 

established during the performance test. 

5. Moving-bed gas-solid 

adsorption system (e.g., 

ChlorsorbTM System). 

The daily average temperature of the gas entering or exiting the 

adsorption system must not exceed the limit established during 

the performance test; and the weekly average chloride level on 

the sorbent entering the adsorption system must not exceed the 

design or manufacturer's recommended limit (1.35 weight 

percent for the ChlorsorbTM System); and the weekly average 

chloride level on the sorbent leaving the adsorption system must 

not exceed the design or manufacturer's recommended limit (1.8 

weight percent for the ChlorsorbTM System). 

Table 24 to Subpart UUU of Part 63—Continuous Monitoring Systems for Inorganic HAP 

Emissions From Catalytic Reforming Units 

As stated in §63.1567(b)(1), you shall meet each requirement in the following table that applies 

to you. 
120 

If you use this type of 

control device for your vent 

. . . 

You shall install and operate this type of continuous 

monitoring system . . . 

1. Wet scrubber Continuous parameter monitoring system to measure and record 

the total water (or scrubbing liquid) flow rate entering the 

scrubber during coke burn-off and catalyst rejuvenation; and 

continuous parameter monitoring system to measure and record 

gas flow rate entering or exiting the scrubber during coke burnoff and catalyst rejuvenation1

; and continuous parameter 

monitoring system to measure and record the pH or alkalinity of 

the water (or scrubbing liquid) exiting the scrubber during coke 

burn-off and catalyst rejuvenation.2

2. Internal scrubbing system 

or no control device (e.g., hot 

regen system) to meet HC1l

outlet concentration limit. 

Colormetric tube sampling system to measure the HC1l

concentration in the catalyst regenerator exhaust gas during coke 

burn-off and catalyst rejuvenation. The colormetric tube sampling 

system must meet the requirements in Table 41 of this subpart. 

3. Internal scrubbing system 

to meet HC1l percent 

reduction standard 

Continuous parameter monitoring system to measure and record 

the gas flow rate entering or exiting the internal scrubbing system 

during coke burn-off and catalyst rejuvenation; and continuous 

parameter monitoring system to measure and record the total 

water (or scrubbing liquid) flow rate entering the internal 

scrubbing system during coke burn-off and catalyst rejuvenation; 

and continuous parameter monitoring system to measure and 

record the pH or alkalinity of the water (or scrubbing liquid) 

exiting the internal scrubbing system during coke burn-off and 

catalyst rejuvenation.2

4. Fixed-bed gas-solid 

adsorption system 

Continuous parameter monitoring system to measure and record 

the temperature of the gas entering or exiting the adsorption 

system during coke burn-off and catalyst rejuvenation; and 

colormetric tube sampling system to measure the gaseous HC1l

concentration in the adsorption system exhaust and at a point 

within the absorbent bed not to exceed 90 percent of the total 

length of the absorbent bed during coke burn-off and catalyst 

rejuvenation. The colormetric tube sampling system must meet 

the requirements in Table 41 of this subpart. 

5. Moving-bed gas-solid 

adsorption system (e.g., 

ChlorsorbTM System). 

Continuous parameter monitoring system to measure and record 

the temperature of the gas entering or exiting the adsorption 

system during coke burn-off and catalyst rejuvenation. 

1

If applicable, you can use the alternative in §63.1573 (a)(1) instead of a continuous parameter monitoring system 

for gas flow rate or instead of a continuous parameter monitoring system for the cumulative volume of gas. 

2

If applicable, you can use the alternative in §63.1573(bc)(1) instead of a continuous parameter monitoring system 

for pH of the water (or scrubbing liquid) or the alternative in §63.1573(bc)(2) instead of a continuous parameter 

monitoring system for alkalinity of the water (or scrubbing liquid). 
121 

Table 25 to Subpart UUU of Part 63—Requirements for Performance Tests for Inorganic 

HAP Emissions From Catalytic Reforming Units 

As stated in §63.1567(b)(2) and (3), you shall meet each requirement in the following table that 

applies to you. 

For each new 

and existing 

catalytic 

reforming unit 

using . . . You shall . . . Using . . . 

According to these 

requirements . . . 

1. Any or no 

control system 

a. Select 

sampling port 

location(s) and 

the number of 

traverse points 

Method 1 or 1A (40 CFR 

part 60, appendix A), as 

applicable. 

(1) If you operate a control 

device and you elect to meet 

an applicable HCl percent 

reduction standard, 

sampling sites must be 

located at the inlet of the 

control device or internal 

scrubbing system and at the 

outlet of the control device 

or internal scrubber system 

prior to any release to the 

atmosphere. For a series of 

fixed-bed systems, the 

outlet sampling site should 

be located at the outlet of 

the first fixed-bed, prior to 

entering the second fixedbed in the series. 

 (2) If you elect to meet an 

applicable HCl outlet 

concentration limit, locate 

sampling sites at the outlet 

of the control device or 

internal scrubber system 

prior to any release to the 

atmosphere. For a series of 

fixed-bed systems, the 

outlet sampling site should 

be located at the outlet of 

the first fixed-bed, prior to 

entering the second fixedbed in the series. If there is 

no control device, locate 
122 

For each new 

and existing 

catalytic 

reforming unit 

using . . . You shall . . . Using . . . 

According to these 

requirements . . . 

sampling sites at the outlet 

of the catalyst regenerator 

prior to any release to the 

atmosphere. 

 b. Determine 

velocity and 

volumetric flow 

rate. 

Method 2, 2A, 2C, 2D, 2F, 

or 2G (40 CFR part 60, 

appendix A), as applicable. 

 c. Conduct gas 

molecular weight 

analysis. 

Method 3, 3A, or 3B (40 

CFR part 60, appendix A), as 

applicable 

 d. Measure 

moisture content 

of the stack gas 

Method 4 (40 CFR part 60, 

appendix A) 

 e. Measure the 

HCl 

concentration at 

the selected 

sampling 

locations 

Method 26 or 26A (40 CFR 

part 60, appendix A). If your 

control device is a wet 

scrubber or internal 

scrubbing system, you must 

use Method 26A 

(1) For semi-regenerative 

and cyclic regeneration 

units, conduct the test 

during the coke burn-off 

and catalyst rejuvenation 

cycle, but collect no 

samples during the first 

hour or the last 6 hours of 

the cycle (for semiregenerative units) or during 

the first hour or the last 2 

hours of the cycle (for 

cyclic regeneration units). 

For continuous regeneration 

units, the test should be 

conducted no sooner than 3 

days after process unit or 

control system start up. 

 (2) Determine and record 

the HCl concentration 

corrected to 3 percent 

oxygen (using Equation 1 of 

§63.1567) for each 

sampling location for each 

test run. 
123 

For each new 

and existing 

catalytic 

reforming unit 

using . . . You shall . . . Using . . . 

According to these 

requirements . . . 

 (3) Determine and record 

the percent emission 

reduction, if applicable, 

using Equation 3 of 

§63.1567 for each test run. 

 (4) Determine and record 

the average HCl 

concentration (corrected to 

3 percent oxygen) and the 

average percent emission 

reduction, if applicable, for 

the overall source test from 

the recorded test run values.

2. Wet scrubber a. Establish 

operating limit 

for pH level or 

alkalinity 

i. Data from continuous 

parameter monitoring 

systems 

Measure and record the pH 

or alkalinity of the water (or 

scrubbing liquid) exiting 

scrubber every 15 minutes 

during the entire period of 

the performance test. 

Determine and record the 

minimum hourly average 

pH or alkalinity level from 

the recorded values. 

 ii. Alternative pH procedure 

in §63.1573 (b)(1). 

Measure and record the pH 

of the water (or scrubbing 

liquid) exiting the scrubber 

during coke burn-off and 

catalyst rejuvenation using 

pH strips at least three times 

during each test run. 

Determine and record the 

average pH level for each 

test run. Determine and 

record the minimum test run 

average pH level. 
124 

For each new 

and existing 

catalytic 

reforming unit 

using . . . You shall . . . Using . . . 

According to these 

requirements . . . 

 iii. Alternative alkalinity 

method in §63.1573(bc)(2) 

Measure and record the 

alkalinity of the water (or 

scrubbing liquid) exiting the 

scrubber during coke burnoff and catalyst rejuvenation 

using discrete titration at 

least three times during each 

test run. Determine and 

record the average alkalinity 

level for each test run. 

Determine and record the 

minimum test run average 

alkalinity level. 

 b. Establish 

operating limit 

for liquid-to-gas 

ratio. 

i. Data from continuous 

parameter monitoring 

systems 

Measure and record the gas 

flow rate entering or exiting 

the scrubber and the total 

water (or scrubbing liquid) 

flow rate entering the 

scrubber every 15 minutes 

during the entire period of 

the performance test. 

Determine and record the 

hourly average gas flow rate 

and total water (or 

scrubbing liquid) flow rate. 

Determine and record the 

minimum liquid-to-gas ratio 

from the recorded, paired 

values. 

 ii. Alternative procedure for 

gas flow rate in 

§63.1573(a)(1) 

Collect air flow rate 

monitoring data or 

determine the air flow rate 

using control room 

instruments every 15 

minutes during the entire 

period of the initial 

performance test. Determine 

and record the hourly 

average rate of all the 

readings. Determine and 
125 

For each new 

and existing 

catalytic 

reforming unit 

using . . . You shall . . . Using . . . 

According to these 

requirements . . . 

record the maximum gas 

flow rate using Equation 1 

of §63.1573. 

3. Internal 

scrubbing system 

or no control 

device (e.g., hot 

regen system) 

meeting HCl 

outlet 

concentration 

limit. 

Establish 

operating limit 

for HCl 

concentration. 

Data from continuous 

parameter monitoring 

system. 

Measure and record the HCl 

concentration in the catalyst 

regenerator exhaust gas 

using the colormetric tube 

sampling system at least 

three times during each test 

run. Determine and record 

the average HCl 

concentration for each test 

run. Determine and record 

the average HCl 

concentration for the overall 

source test from the 

recorded test run averages. 

Determine and record the 

operating limit for HCl 

concentration using 

Equation 4 of §63.1567. 

4. Internal 

scrubbing system 

meeting HCl 

percent reduction 

standard 

a. Establish 

operating limit 

for pH level or 

alkalinity 

i. Data from continuous 

parameter monitoring system

Measure and record the pH 

alkalinity of the water (or 

scrubbing liquid) exiting the 

internal scrubbing system 

every 15 minutes during the 

entire period of the 

performance test. Determine 

and record the minimum 

hourly average pH or 

alkalinity level from the 

recorded values. 

 ii. Alternative pH method in 

§63.1573(bc)(1) 

Measure and in record pH 

of the water (or scrubbing 

liquid) exiting the internal 

scrubbing system during 

coke burn-off and catalyst 

rejuvenation using pH strips 

at least three times during 

each test run. Determine and 
126 

For each new 

and existing 

catalytic 

reforming unit 

using . . . You shall . . . Using . . . 

According to these 

requirements . . . 

record the average pH level 

for each test run. Determine 

and record the minimum 

test run average pH level. 

 iii. Alternative alkalinity 

method in §63.1573(bc)(2) 

Measure and record the 

alkalinity water (or 

scrubbing liquid) exiting the 

internal scrubbing system 

during coke burn-off and 

catalyst rejuvenation using 

discrete titration at least 

three times during each test 

run. Determine and record 

the average alkalinity level 

for each test run. Determine 

and record the minimum 

test run average alkalinity 

level. 

 b. Establish 

operating limit 

for liquid-to-gas 

ratio 

Data from continuous 

parameter monitoring 

systems 

Measure and record the gas 

entering or exiting the 

internal scrubbing system 

and the total water (or 

scrubbing liquid) flow rate 

entering the internal 

scrubbing system every 15 

minutes during the entire 

period of the performance 

test. Determine and record 

the hourly average gas flow 

rate and total water (or 

scrubbing liquid) flow rate. 

Determine and record the 

minimum liquid-to-gas ratio 

from the recorded, paired 

values. 
127 

For each new 

and existing 

catalytic 

reforming unit 

using . . . You shall . . . Using . . . 

According to these 

requirements . . . 

5. Fixed-bed gassolid adsorption 

system. Gas-solid 

a. Establish 

operating limit 

for temperature 

Data from continuous 

parameter monitoring system

Measure and record the 

temperature of gas entering 

or exiting the adsorption 

system every 15 minutes. 

Determine and record the 

maximum hourly average 

temperature. 

 b. Establish 

operating limit 

for HCl 

concentration 

i. Data from continuous 

parameter monitoring 

systems 

(1) Measure and record the 

HCl concentration in the 

exhaust gas from the fixedbed adsorption system using 

the colormetric tube 

sampling system at least 

three times during each test 

run. Determine and record 

the average HCl 

concentration for each test 

run. Determine and record 

the average HCl 

concentration for the overall 

source test from the 

recorded test run averages. 

 (2) If you elect to comply 

with the HCl outlet 

concentration limit (Option 

2), determine and record the 

operating limit for HCl 

concentration using 

Equation 4 of §63.1567. If 

you elect to comply with the 

HCl percent reduction 

standard (Option 1), 

determine and record the 

operating limit for HCl 

concentration using 

Equation 5 of §63.1567. 

6. Moving-bed 

gas-solid 

adsorption system 

(e.g., 

a. Establish 

operating limit 

for temperature 

Data from continuous 

parameter monitoring 

systems. 

Measure and record the 

temperature of gas entering 

or exiting the adsorption 

system every 15 minutes. 
128 

For each new 

and existing 

catalytic 

reforming unit 

using . . . You shall . . . Using . . . 

According to these 

requirements . . . 

ChlorsorbTM

System) 

Determine and record the 

maximum hourly average 

temperature. 

 b. Measure the 

chloride level on 

the sorbent 

entering and 

exiting the 

adsorption 

system. 

Determination of Metal 

Concentration on Catalyst 

Particles (Instrumental 

Analyzer Procedure) in 

appendix A to subpart UUU; 

or EPA Method 5050 

combined either with EPA 

Method 9056, or with EPA 

Method 9253; or EPA 

Method 9212 with the soil 

extraction procedures listed 

within the method.1

Measure and record the 

chloride concentration of 

the sorbent material entering 

and exiting the adsorption 

system at least three times 

during each test run. 

Determine and record the 

average weight percent 

chloride concentration of 

the sorbent entering the 

adsorption system for each 

test run. Determine and 

record the average weight 

percent chloride 

concentration of the sorbent 

exiting the adsorption 

system for each test run. 

1

The EPA Methods 5050, 9056, 9212 and 9253 are included in “Test Methods for Evaluating Solid Waste, 

Physical/Chemical Methods,” EPA Publication SW-846, Revision 5 (April 1998). The SW-846 and Updates 

(document number 955-001-00000-1) are available for purchase from the Superintendent of Documents, U.S. 

Government Printing Office, Washington, DC 20402, (202) 512-1800; and from the National Technical Information 

Services (NTIS), 5285 Port Royal Road, Springfield, VA 22161, (703) 487-4650. Copies may be inspected at the 

EPA Docket Center (Air Docket), EPA West, Room B-108, 1301 Constitution Ave., NW., Washington, DC; or at 

the Office of the Federal Register, 800 North Capitol Street, NW., Suite 700, Washington, DC. These methods are 

also available at http://www.epa.gov/epaoswer/hazwaste/test/main.htm. 

Table 26 to Subpart UUU of Part 63—Initial Compliance With Inorganic HAP Emission 

Limits for Catalytic Reforming Units 

As stated in §63.1567(b)(4), you shall meet each requirement in the following table that applies 

to you. 
129 

For . . . 

For the following 

emission limit . . . 

You have demonstrated initial 

compliance if . . . 

1. Each existing semiregenerative catalytic 

reforming unit 

Reduce uncontrolled 

emissions of HCl by 92 

percent by weight or to a 

concentration of 30 ppmv, 

(dry basis), corrected to 3 

percent oxygen. 

Average emissions HCl measured 

using Method 26 or 26A, as applicable, 

over the period of the performance test, 

are reduced by 92 percent or to a 

concentration less than or equal to 30 

ppmv (dry basis) corrected to 3 percent 

oxygen. 

2. Each existing cyclic or 

continuous catalytic 

reforming unit and each 

new semi-regenerative, 

cyclic, or continuous 

catalytic reforming unit. 

Reduce uncontrolled 

emissions of HCl by 97 

percent by weight or to a 

concentration of 10 ppmv 

(dry basis), corrected to 3 

percent oxygen 

Average emissions of HCl measured 

using Method 26 or 26A, as applicable, 

over the period of the performance test, 

are reduced by 97 percent or to a 

concentration less than or equal to 10 

ppmv (dry basis) corrected to 3 percent 

oxygen. 

Table 27 to Subpart UUU of Part 63—Continuous Compliance With Inorganic HAP 

Emission Limits for Catalytic Reforming Units 

As stated in §63.1567(c)(1), you shall meet each requirement in the following table that applies 

to you. 

For . . . For this emission limit . . . 

You shall demonstrate 

continuous compliance during 

coke burn-off and catalyst 

rejuvenation by . . . 

1. Each existing semiregenerative catalytic 

reforming unit 

Reduce uncontrolled emissions of 

HCl by 92 percent by weight or to 

a concentration of 30 ppmv (dry 

basis), corrected to 3 percent 

oxygen. 

Maintaining a 92 percent HCl 

emission reduction or an HCl 

concentration no more than 30 

ppmv (dry basis), corrected to 3 

percent oxygen. 

2. Each existing cyclic 

or continuous catalytic 

reforming unit 

Reduce uncontrolled emissions of 

HCl by 97 percent by weight or to 

a concentration of 10 ppmv (dry 

basis), corrected to 3 percent 

oxygen 

Maintaining a 97 percent HCl 

control efficiency or an HCl 

concentration no more than 10 

ppmv (dry basis), corrected to 3 

percent oxygen. 

3. Each new semiregenerative, cyclic, or 

continuous catalytic 

reforming unit 

Reduce uncontrolled emissions of 

HCl by 97 percent by weight or to 

a concentration of 10 ppmv (dry 

basis), corrected to 3 percent 

oxygen 

Maintaining a 97 percent HCl 

control efficiency or an HCl 

concentration no more than 10 

ppmv (dry basis), corrected to 3 

percent oxygen. 
130 

Table 28 to Subpart UUU of Part 63—Continuous Compliance With Operating Limits for 

Inorganic HAP Emissions From Catalytic Reforming Units 

As stated in §63.1567(c)(1), you shall meet each requirement in the following table that applies 

to you. 

For each new and 

existing catalytic 

reforming unit 

using this type of 

control device or 

system . . . For this operating limit . . . 

You shall demonstrate continuous 

compliance during coke burn-off 

and catalyst rejuvenation by . . . 

1. Wet scrubber a. The daily average pH or alkalinity 

of the water (or scrubbing liquid) 

exiting the scrubber must not fall 

below the level established during 

the performance test 

Collecting the hourly and daily 

average pH or alkalinity monitoring 

data according to §63.15721

; and 

maintaining the daily average pH or 

alkalinity above the operating limit 

established during the performance 

test. 

 b. The daily average liquid-to-gas 

ratio must not fall below the level 

established during the performance 

test 

Collecting the hourly average gas 

flow rate2

 and total water (or 

scrubbing liquid) flow rate 

monitoring data according to 

§63.1572; and determining and 

recording the hourly average liquidto-gas ratio; and determining and 

recording the daily average liquid-togas ratio; and maintaining the daily 

average liquid-to-gas ratio above the 

limit established during the 

performance test. 

2. Internal 

scrubbing system or 

no control device 

(e.g., hot regen 

system) meeting 

HCl concentration 

limit 

The daily average HCl concentration 

in the catalyst regenerator exhaust 

gas must not exceed the limit 

established during the performance 

test 

Measuring and recording the HCl 

concentration at least 4 times during 

a regeneration cycle (equally spaced 

in time) or every 4 hours, whichever 

is more frequent, using a colormetric 

tube sampling system; calculating 

the daily average HCl concentration 

as an arithmetic average of all 

samples collected in each 24-hour 

period from the start of the coke 

burn-off cycle or for the entire 

duration of the coke burn-off cycle if 

the coke burn-off cycle is less than 

24 hours; and maintaining the daily 
131 

For each new and 

existing catalytic 

reforming unit 

using this type of 

control device or 

system . . . For this operating limit . . . 

You shall demonstrate continuous 

compliance during coke burn-off 

and catalyst rejuvenation by . . . 

average HCl concentration below the 

applicable operating limit. 

3. Internal 

scrubbing system 

meeting percent 

HCl reduction 

standard 

a. The daily average pH or alkalinity 

of the water (or scrubbing liquid) 

exiting the internal scrubbing system 

must not fall below the limit 

established during the performance 

test 

Collecting the hourly and daily 

average pH or alkalinity monitoring 

data according to §63.15721 and 

maintaining the daily average pH or 

alkalinity above the operating limit 

established during the performance 

test. 

 b. The daily average liquid-to-gas 

ratio must not fall below the level 

established during the performance 

test 

Collecting the hourly average gas 

flow rate2 and total water (or 

scrubbing liquid) flow rate 

monitoring data according to 

§63.1572; and determining and 

recording the hourly average liquidto-gas ratio; and determining and 

recording the daily average liquid-togas ratio; and maintaining the daily 

average liquid-to-gas ratio above the 

limit established during the 

performance test. 

4. Fixed-bed gassolid adsorption 

systems 

a. The daily average temperature of 

the gas entering or exiting the 

adsorption system must not exceed 

the limit established during the 

performance test 

Collecting the hourly and daily 

average temperature monitoring data 

according to §63.1572; and 

maintaining the daily average 

temperature below the operating 

limit established during the 

performance test. 

 b. The HCl concentration in the 

exhaust gas from the fixed-bed gassolid adsorption system must not 

exceed the limit established during 

the performance test 

Measuring and recording the 

concentration of HCl weekly or 

during each regeneration cycle, 

whichever is less frequent, using a 

colormetric tube sampling system at 

a point within the adsorbent bed not 

to exceed 90 percent of the total 

length of the adsorption bed during 

coke-burn-off and catalyst 

rejuvenation; implementing 

procedures in the operating and 
132 

For each new and 

existing catalytic 

reforming unit 

using this type of 

control device or 

system . . . For this operating limit . . . 

You shall demonstrate continuous 

compliance during coke burn-off 

and catalyst rejuvenation by . . . 

maintenance plan if the HCl 

concentration at the sampling 

location within the adsorption bed 

exceeds the operating limit; and 

maintaining the HCl concentration in 

the gas from the adsorption system 

below the applicable operating limit. 

5. Moving-bed gassolid adsorption 

system (e.g., 

ChlorsorbTM

System 

a. The daily average temperature of 

the gas entering or exiting the 

adsorption system must not exceed 

the limit established during the 

performance test 

Collecting the hourly and daily 

average temperature monitoring data 

according to §63.1572; and 

maintaining the daily average 

temperature below the operating 

limit established during the 

performance test. 

 b. The weekly average chloride level 

on the sorbent entering the 

adsorption system must not exceed 

the design or manufacturer's 

recommended limit (1.35 weight 

percent for the 

ClorsorbTMChlorsorbTM System)

Collecting samples of the sorbent 

exiting the adsorption system three 

times per week (on non-consecutive 

days); and analyzing the samples for 

total chloride3; and determining and 

recording the weekly average 

chloride concentration; and 

maintaining the chloride 

concentration below the design or 

manufacturer's recommended limit 

(1.35 weight percent for the 

ChlorsorbTM System). 

 c. The weekly average chloride level 

on the sorbent exiting the adsorption 

system must not exceed the design 

or manufacturer's recommended 

limit (1.8 weight percent for the 

ChlorsorbTM System) 

Collecting samples of the sorbent 

exiting the adsorption system three 

times per week (on non-consecutive 

days); and analyzing the samples for 

total chloride concentration; and 

determining and recording the 

weekly average chloride 

concentration; and maintaining the 

chloride concentration below the 

design or manufacturer's 

recommended limit (1.8 weight 

percent ChlorsorbTM System). 
133 

1

If applicable, you can use either alternative in §63.1573(bc) instead of a continuous parameter monitoring system 

for pH or alkalinity if you used the alternative method in the initial performance test. 

2

If applicable, you can use the alternative in §63.1573(a)(1) instead of a continuous parameter monitoring system for 

the gas flow rate or cumulative volume of gas entering or exiting the system if you used the alternative method in 

the initial performance test. 

3

The total chloride concentration of the sorbent material must be measured by the procedure, “Determination of 

Metal Concentration on Catalyst Particles (Instrumental Analyzer Procedure)” in appendix A to this subpart; or by 

using EPA Method 5050, Bomb Preparation Method for Solid Waste, combined either with EPA Method 9056, 

Determination of Inorganic Anions by Ion Chromatography, or with EPA Method 9253, Chloride (Titrimetric, 

Silver Nitrate); or by using EPA Method 9212, Potentiometric Determination of Chloride in Aqueous Samples with 

Ion-Selective Electrode, and using the soil extraction procedures listed within the method. The EPA Methods 5050, 

9056, 9212 and 9253 are included in “Test Methods for Evaluating Solid Waste, Physical/Chemical Methods,” EPA 

Publication SW-846, Revision 5 (April 1998). The SW-846 and Updates (document number 955-001-00000-1) are 

available for purchase from the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 

20402, (202) 512-1800; and from the National Technical Information Services (NTIS), 5285 Port Royal Road, 

Springfield, VA 22161, (703) 487-4650. Copies may be inspected at the EPA Docket Center (Air Docket), EPA 

West, Room B-108, 1301 Constitution Ave., NW., Washington, DC; or at the Office of the Federal Register, 800 

North Capitol Street, NW., Suite 700, Washington, DC. These methods are also available at 

http://www.epa.gov/epaoswer/hazwaste/test/main.htm. 

Table 29 to Subpart UUU of Part 63—HAP Emission Limits for Sulfur Recovery Units 

As stated in §63.1568(a)(1), you shall meet each emission limitation in the following table that 

applies to you. 

For . . . 

You shall meet this emission limit for each 

process vent . . . 

1. Each new or existing Claus sulfur recovery 

unit part of a sulfur recovery plant ofwith 

design capacity greater than 20 long tons 

per day or more and subject to the NSPS for 

sulfur oxides in 40 CFR 60.104(a)(2) or in 40 

CFR 60.102a(f)(1). 

a. 250 ppmv (dry basis) of sulfur dioxide (SO2) at 

zero percent excess air, or concentration 

determined using Equation 1 of 40 CFR 

60.102a(f)(1)(i), if you use an oxidation 

orcontrol system or if you use a reduction 

control system followed by incineration. 

 b. 300 ppmv of reduced sulfur compounds 

calculated as ppmv SO2 (dry basis) at zero 

percent excess air, or concentration determined 

using Equation 1 of 40 CFR 60.102a(f)(1)(i), if 

you use a reduction control system without 

incineration. 

2. Each new or existing sulfur recovery unit 

(Claus or other type, regardless of size) not 

subject to the NSPS for sulfur oxides in 40 

CFR 60.104(a)(2) or in 40 CFR 

60.102a(f)(1): Option 1 (Elect NSPS). 

a. 250 ppmv (dry basis) of SO2 at zero percent 

excess air, or concentration determined using 

Equation 1 of 40 CFR 60.102a(f)(1)(i), if you 

use an oxidation orcontrol system or if you use 

a reduction control system followed by 

incineration. 
134 

For . . . 

You shall meet this emission limit for each 

process vent . . . 

 b. 300 ppmv of reduced sulfur compounds 

calculated as ppmv SO2 (dry basis) at zero 

percent excess air, or concentration determined 

using Equation 1 of 40 CFR 60.102a(f)(1)(i), if 

you use a reduction control system without 

incineration. 

3. Each new or existing sulfur recovery unit 

(Claus or other type, regardless of size) not 

subject to the NSPS for sulfur oxides in 

paragraph (a)(2) of 40 CFR 60.104:(a)(2) or 

in 40 CFR 60.102a(f)(1): Option 2 (TRS 

limit). 

300 ppmv of total reduced sulfur (TRS) 

compounds, expressed as an equivalent SO2

concentration (dry basis) at zero percent oxygen. 

Table 30 to Subpart UUU of Part 63—Operating Limits for HAP Emissions From Sulfur 

Recovery Units 

As stated in §63.1568(a)(2), you shall meet each operating limit in the following table that 

applies to you. 

For . . . 

If use this 

type of 

control 

device 

You shall meet this operating limit. . 

. 

1. Each new or existing Claus sulfur 

recovery unit part of a sulfur recovery 

plant ofwith design capacity greater 

than 20 long tons per day or more and 

subject to the NSPS for sulfur oxides in 

40 CFR 60.104(a)(2) or in 40 CFR 

60.102a(f)(1). 

Not 

applicable 

Not applicable. 

2. Each new or existing sulfur recovery 

unit (Claus or other type, regardless of 

size) not subject to the NSPS for sulfur 

oxides in 40 CFR 60.104(a)(2) or in 40 

CFR 60.102a(f)(1): Option 1 (Elect 

NSPS). 

Not 

applicable 

Not applicable. 

3. Each new or existing sulfur 

recovery unit (Claus or other type, 

regardless of size) not subject to the 

NSPS for sulfur oxides in 40 CFR 

60.104(a)(2) or in 40 CFR 

Not 

applicable

Not applicable. 
135 

For . . . 

If use this 

type of 

control 

device 

You shall meet this operating limit. . 

. 

60.102a(f)(1): Option 2 (TRS limit), if 

using continuous emissions 

monitoring systems. 

34. Each new or existing sulfur 

recovery unit (Claus or other type, 

regardless of size) not subject to the 

NSPS for sulfur oxides in 40 CFR 

60.104(a)(2) or in 40 CFR 

60.102a(f)(1): Option 2 (TRS limit), if 

using continuous parameter 

monitoring systems. 

Thermal 

incinerator 

Maintain the daily average combustion 

zone temperature above the limit 

established during the performance test; 

and maintain the daily average oxygen 

concentration in the vent stream 

(percent, dry basis) above the limit 

established during the performance test. 

Table 31 to Subpart UUU of Part 63—Continuous Monitoring Systems for HAP Emissions 

From Sulfur Recovery Units 

As stated in §63.1568(b)(1), you shall meet each requirement in the following table that applies 

to you. 

For . . . For this limit . . . 

You shall install and operate this 

continuous monitoring system . . .

1. Each new or existing Claus 

sulfur recovery unit part of a 

sulfur recovery plant ofwith 

design capacity greater than

20 long tons per day or more 

and subject to the NSPS for 

sulfur oxides in 40 CFR 

60.104(a)(2) or in 40 CFR 

60.102a(f)(1).

a. 250 ppmv (dry basis) of 

SO2 at zero percent excess 

air if you use an oxidation 

or reduction control 

system followed by 

incineration 

Continuous emission monitoring 

system to measure and record the 

hourly average concentration of SO2

(dry basis) at zero percent excess air 

for each exhaust stack. This system 

must include an oxygen monitor for 

correcting the data for excess air. 

 b. 300 ppmv of reduced 

sulfur compounds 

calculated as ppmv SO2

(dry basis) at zero percent 

excess air if you use a 

reduction control system 

without incineration 

Continuous emission monitoring 

system to measure and record the 

hourly average concentration of 

reduced sulfur and oxygen (O2) 

emissions. Calculate the reduced 

sulfur emissions as SO2 (dry basis) 

at zero percent excess air. Exception:

You can use an instrument having an 

air or SO2 dilution and oxidation 

system to convert the reduced sulfur 

to SO2 for continuously monitoring 
136 

For . . . For this limit . . . 

You shall install and operate this 

continuous monitoring system . . .

and recording the concentration (dry 

basis) at zero percent excess air of 

the resultant SO2 instead of the 

reduced sulfur monitor. The monitor 

must include an oxygen monitor for 

correcting the data for excess 

oxygen. 

c. If you use Equation 1 

of 40 CFR 

60.102a(f)(1)(i) to set 

your emission limit 

Complete either item 1.a or item 

1.b; and you must also install and 

operate a continuous emission 

monitoring system to measure and 

record the O2 concentration for 

the inlet air/oxygen supplied to the 

system. 

2. Option 1: Elect NSPS. Each 

new or existing sulfur 

recovery unit (Claus or other 

type, regardless of size) not 

subject to the NSPS for sulfur 

oxides in paragraph (a) (2) of 

40 CFR 60.104 or in 40 CFR 

60.102a(f)(1).

a. 250 ppmv (dry basis) of 

SO2 at zero percent excess 

air if you use an oxidation 

or reduction control 

system followed by 

incineration 

Continuous emission monitoring 

system to measure and record the 

hourly average concentration of SO2

(dry basis), at zero percent excess air 

for each exhaust stack. This system 

must include an oxygen monitor for 

correcting the data for excess air. 

 b. 300 ppmv of reduced 

sulfur compounds 

calculated as ppmv SO2

(dry basis) at zero percent 

excess air if you use a 

reduction control system 

without incineration. 

Continuous emission monitoring 

system to measure and record the 

hourly average concentration of 

reduced sulfur and O2 emissions for 

each exhaust stack. Calculate the 

reduced sulfur emissions as SO2 (dry 

basis), at zero percent excess air. 

Exception: You can use an 

instrument having an air or O2

dilution and oxidation system to 

convert the reduced sulfur to SO2 for 

continuously monitoring and 

recording the concentration (dry 

basis) at zero percent excess air of 

the resultant SO2 instead of the 

reduced sulfur monitor. The monitor 

must include an oxygen monitor for 

correcting the data for excess 

oxygen. 
137 

For . . . For this limit . . . 

You shall install and operate this 

continuous monitoring system . . .

c. If you use Equation 1 

of 40 CFR 

60.102a(f)(1)(i) to set 

your emission limit 

Complete either item 2.a or item 

2.b; and you must also install and 

operate a continuous emission 

monitoring system to measure and 

record the O2 concentration for 

the inlet air/oxygen supplied to the 

system. 

3. Option 2: TRS limit. Each 

new or existing sulfur 

recovery unit (Claus or other 

type, regardless of size) not 

subject to the NSPS for sulfur 

oxides in 40 CFR 60.104(a)(2)

or in 40 CFR 60.102a(f)(1).

300 ppmv of total reduced 

sulfur (TRS) compounds, 

expressed as an equivalent 

SO2 concentration (dry 

basis) at zero percent 

oxygen 

i. Continuous emission monitoring 

system to measure and record the 

hourly average concentration of TRS 

for each exhaust stack; this monitor 

must include an oxygen monitor for 

correcting the data for excess 

oxygen; or 

 ii. Continuous parameter monitoring 

systems to measure and record the 

combustion zone temperature of 

each thermal incinerator and the 

oxygen content (percent, dry basis) 

in the vent stream of the incinerator. 

Table 32 to Subpart UUU of Part 63—Requirements for Performance Tests for HAP 

Emissions From Sulfur Recovery Units Not Subject to the New Source Performance 

Standards for Sulfur Oxides 

As stated in §63.1568(b)(2) and (3), you shall meet each requirement in the following table that 

applies to you. 

For . . . You must . . . Using . . . 

According to these 

requirements . . . 

1. Each new and 

existing sulfur 

recovery unit: Option 

1 (Elect NSPS). 

Measure SO2 concentration 

(for an oxidation or 

reduction system followed 

by incineration) or

measure the concentration 

of reduced sulfur (or SO2 if 

you use an instrument to 

convert the reduced sulfur 

to SO2) for a reduction 

control system without 

incineration. 

Data from 

continuous 

emission 

monitoring system. 

Collect SO2 monitoring 

data every 15 minutes for 

24 consecutive operating 

hours. Reduce the data to 

1-hour averages 

computed from four or 

more data points equally 

spaced over each 1-hour 

period. 
138 

For . . . You must . . . Using . . . 

According to these 

requirements . . . 

Measure O2

concentration for the inlet 

air/oxygen supplied to the 

system, if using Equation 

1 of 40 CFR 

60.102a(f)1)(i) to set your 

emission limit. 

Data from 

continuous 

emission 

monitoring 

system. 

Collect O2 monitoring 

data every 15 minutes 

for 24 consecutive 

operating hours. 

Reduce the data to 1-

hour averages 

computed from four or 

more data points 

equally spaced over 

each 1-hour period; and 

average over the 24-

hour period for input to 

Equation 1 of 40 CFR 

60.102a(f)(1)(i). 

2. Each new and 

existing sulfur 

recovery unit: 

Option 2 (TRS limit), 

using CEMS 

Measure the 

concentration of reduced 

sulfur (or SO2 if you use 

an instrument to convert 

the reduced sulfur to 

SO2). 

Data from 

continuous 

emission 

monitoring 

system. 

Collect TRS data every 

15 minutes for 24 

consecutive operating 

hours. Reduce the data 

to 1-hour averages 

computed from four or 

more data points 

equally spaced over 

each 1-hour period. 

23. Each new and 

existing sulfur 

recovery unit: Option 

2 (TRS limit)., if 

using continuous 

parameter 

monitoring systems

a. Select sampling port's 

location and the number of 

traverse ports. 

Method 1 or 1A 

appendixin 

Appendix A-1 to 

part 60 of this 

chapter. 

Sampling sites must be 

located at the outlet of the 

control device and prior 

to any releases to the 

atmosphere. 

 b. Determine velocity and 

volumetric flow rate. 

Method 2, 2A, 2C, 

2D, 2F, or 2G in 

appendix A to part 

60 of this chapter, 

as applicable. 

 c. Conduct gas molecular 

weight analysis; obtain the 

oxygen concentration 

needed to correct the 

emission rate for excess air.

Method 3, 3A, or 

3B in appendix A to 

part 60 of this 

chapter, as 

applicable. 

Take the samples 

simultaneously with 

reduced sulfur or 

moisture samples. 
139 

For . . . You must . . . Using . . . 

According to these 

requirements . . . 

 d. Measure moisture 

content of the stack gas. 

Method 4 in 

appendix A to part 

60 of this chapter. 

Make your sampling time 

for each Method 4 

sample equal to that for 4 

Method 15 samples. 

 e. Measure the 

concentration of TRS. 

Method 15 or 15A 

in appendix A to 

part 60 of this 

chapter, as 

applicable. 

If the cross-sectional area 

of the duct is less than 5 

square meters (m2) or 54 

square feet, you must use 

the centroid of the cross 

section as the sampling 

point. If the crosssectional area is 5 m2

 or 

more and the centroid is 

more than 1 meter (m) 

from the wall, your 

sampling point may be at 

a point no closer to the 

walls than 1 m or 39 

inches. Your sampling 

rate must be at least 3 

liters per minute or 0.10 

cubic feet per minute to 

ensure minimum 

residence time for the 

sample inside the sample 

lines. 

 f. Calculate the SO2

equivalent for each run 

after correcting for 

moisture and oxygen. 

The arithmetic 

average of the SO2

equivalent for each 

sample during the 

run. 

 g. Correct the reduced 

sulfur samples to zero 

percent excess air.sa

Equation 1 of 

§63.1568. 

 h. Establish each operating 

limit in Table 30 of this 

subpart that applies to you. 

Data from the 

continuous 

parameter 

monitoring system. 

 i. Measure thermal 

incinerator: combustion 

zone temperature. 

Data from the 

continuous 

parameter 

monitoring system. 

Collect temperature 

monitoring data every 15 

minutes during the entire 

period of the performance 
140 

For . . . You must . . . Using . . . 

According to these 

requirements . . . 

test; and determine and 

record the minimum 

hourly average 

temperature from all the 

readings. 

 j. Measure thermal 

incinerator: oxygen 

concentration (percent, dry 

basis) in the vent stream. 

Data from the 

continuous 

parameter 

monitoring system. 

Collect oxygen 

concentration (percent, 

dry basis) data every 15 

minutes during the entire 

period of the performance 

test; and determine and 

record the minimum 

hourly average percent 

excess oxygen 

concentration. 

k. If you use a continuous 

emission monitoring 

system, measure TRS 

concentration. 

Data from 

continuous 

emission 

monitoring system. 

Collect TRS data every 

15 minutes for 24 

consecutive operating 

hours. Reduce the data to 

1-hour averages 

computed from four or 

more data points equally 

spaced over each 1-hour 

period. 

Table 33 to Subpart UUU of Part 63—Initial Compliance With HAP Emission Limits for 

Sulfur Recovery Units 

As stated in §63.1568(b)(5), you shall meet each requirement in the following table that applies 

to you. 

For . . . 

For the following 

emission limit . . . 

You have demonstrated initial 

compliance if . . . 

1. Each new or existing 

Claus sulfur recovery unit 

part of a sulfur recovery 

plant ofwith design capacity

greater than 20 long tons 

per day or more and subject 

to the NSPS for sulfur oxides 

in 40 CFR 60.104(a)(2) or in 

40 CFR 60.102a(f)(1). 

a. 250 ppmv (dry basis) 

SO2 at zero percent excess 

air, or concentration 

determined using 

Equation 1 of 40 CFR 

60.102a(f)(1)(i), if you use 

an oxidation or reduction 

control system followed by 

incineration 

You have already conducted a 

performance test to demonstrate 

initial compliance with the NSPS and 

each 12-hour rolling average 

concentration of SO2 emissions 

measured by the continuous emission 

monitoring system is less than or 

equal to 250 ppmv (dry basis) at zero 

percent excess air, or the 
141 

For . . . 

For the following 

emission limit . . . 

You have demonstrated initial 

compliance if . . . 

concentration determined using 

Equation 1 of 40 CFR 

60.102a(f)(1)(i). As part of the 

Notification of Compliance Status, 

you must certify that your vent meets 

the SO2 limit. You are not required to 

do another performance test to 

demonstrate initial compliance. 

You have already conducted a 

performance evaluation to 

demonstrate initial compliance with 

the applicable performance 

specification. As part of your 

Notification of Compliance Status, 

you must certify that your continuous 

emission monitoring system meets 

the applicable requirements in 

§63.1572. You are not required to do 

another performance evaluation to 

demonstrate initial compliance. 

 b. 300 ppmv of reduced 

sulfur compounds 

calculated as ppmv SO2

(dry basis) at zero percent 

excess air, or 

concentration determined 

using Equation 1 of 40 

CFR 60.102a(f)(1)(i), if 

you use a reduction control 

system without incineration

You have already conducted a 

performance test to demonstrate 

initial compliance with the NSPS and 

each 12-hour rolling average 

concentration of reduced sulfur 

compounds measured by your 

continuous emission monitoring 

system is less than or equal to 300 

ppmv, calculated as ppmv SO2 (dry 

basis) at zero percent excess air, or 

the concentration determined 

using Equation 1 of 40 CFR 

60.102a(f)(1)(i). As part of the 

Notification of Compliance Status, 

you must certify that your vent meets 

the SO2 limit. You are not required to 

do another performance test to 

demonstrate initial compliance. 

You have already conducted a 

performance evaluation to 

demonstrate initial compliance with 

the applicable performance 

specification. As part of your 
142 

For . . . 

For the following 

emission limit . . . 

You have demonstrated initial 

compliance if . . . 

Notification of Compliance Status, 

you must certify that your continuous 

emission monitoring system meets 

the applicable requirements in 

§63.1572. You are not required to do 

another performance evaluation to 

demonstrate initial compliance. 

2. Option 1: Elect NSPS. 

Each new or existing sulfur 

recovery unit (Claus or other 

type, regardless of size) not 

subject to the NSPS for 

sulfur oxides in 40 CFR 

60.104(a)(2) or in 40 CFR 

60.102a(f)(1).

a. 250 ppmv (dry basis) of 

SO2 at zero percent excess 

air, or concentration 

determined using 

Equation 1 of 40 CFR 

60.102a(f)(1)(i), if you use 

an oxidation or reduction 

control system followed by 

incineration 

Each 12-hour rolling average 

concentration of SO2 emissions 

measured by the continuous emission 

monitoring system during the initial 

performance test is less than or equal 

to 250 ppmv (dry basis) at zero 

percent excess air, or the 

concentration determined using 

Equation 1 of 40 CFR 

60.102a(f)(1)(i); and your 

performance evaluation shows the 

monitoring system meets the 

applicable requirements in §63.1572.

 b. 300 ppmv of reduced 

sulfur compounds 

calculated as ppmv SO2

(dry basis) at zero percent 

excess air, or 

concentration determined 

using Equation 1 of 40 

CFR 60.102a(f)(1)(i), if 

you use a reduction control 

system without incineration

Each 12-hour rolling average 

concentration of reduced sulfur 

compounds measured by the 

continuous emission monitoring 

system during the initial performance 

test is less than or equal to 300 ppmv, 

calculated as ppmv SO2 (dry basis) at 

zero percent excess air, or the 

concentration determined using 

Equation 1 of 40 CFR 

60.102a(f)(1)(i); and your 

performance evaluation shows the 

continuous emission monitoring 

system meets the applicable 

requirements in §63.1572. 

3. Option 2: TRS limit. Each 

new or existing sulfur 

recovery unit (Claus or other 

type, regardless of size) not 

subject to the NSPS for 

sulfur oxides in 40 CFR 

60.104(a)(2) or in 40 CFR 

60.102a(f)(1).

300 ppmv of TRS 

compounds expressed as an 

equivalent SO2

concentration (dry basis) at 

zero percent oxygen 

If you use continuous parameter 

monitoring systems, the average 

concentration of TRS emissions 

measured using Method 15 during 

the initial performance test is less 

than or equal to 300 ppmv expressed 

as equivalent SO2 concentration (dry 

basis) at zero percent oxygen. If you 
143 

For . . . 

For the following 

emission limit . . . 

You have demonstrated initial 

compliance if . . . 

use a continuous emission 

monitoring system, each 12-hour 

rolling average concentration of TRS 

emissions measured by the 

continuous emission monitoring 

system during the initial performance 

test is less than or equal to 300 ppmv 

expressed as an equivalent SO2 (dry 

basis) at zero percent oxygen; and 

your performance evaluation shows 

the continuous emission monitoring 

system meets the applicable 

requirements in §63.1572. 

Table 34 to Subpart UUU of Part 63—Continuous Compliance With HAP Emission Limits 

for Sulfur Recovery Units 

As stated in §63.1568(c)(1), you shall meet each requirement in the following table that applies 

to you. 

For . . . For this emission limit . . .

You shall demonstrate 

continuous compliance by . . . 

1. Each new or existing 

Claus sulfur recovery unit 

part of a sulfur recovery 

plant ofwith design 

capacity greater than 20 

long tons per day or more 

and subject to the NSPS for 

sulfur oxides in 40 CFR 

60.104(a)(2) or in 40 CFR 

60.102a(f)(1). 

a. 250 ppmv (dry basis) of 

SO2 at zero percent excess 

air, or concentration 

determined using Equation 

1 of 40 CFR 

60.102a(f)(1)(i), if you use 

an oxidation or reduction 

control system followed by 

incineration. 

Collecting the hourly average SO2

monitoring data (dry basis, percent 

excess air) according to §63.1572; 

determining and recording each 12-

hour rolling average concentration 

of SO2; maintaining each 12-hour 

rolling average concentration of 

SO2 at or below the applicable 

emission limitation; and reporting 

any 12-hour rolling average 

concentration of SO2 greater than 

the applicable emission limitation 

in the semiannual compliance 

report required by §63.1575. 

 b. 300 ppmv of reduced 

sulfur compounds calculated 

as ppmv SO2 (dry basis) at 

zero percent excess air, or 

concentration determined 

using Equation 1 of 40 CFR 

Collecting the hourly average 

reduced sulfur (and air or O2

dilution and oxidation) monitoring 

data according to §63.1572; 

determining and recording each 12-

hour rolling average concentration 
144 

For . . . For this emission limit . . .

You shall demonstrate 

continuous compliance by . . . 

60.102a(f)(1)(i), if you use a 

reduction control system 

without incineration. 

of reduced sulfur; maintaining each 

12-hour rolling average 

concentration of reduced sulfur at 

or below the applicable emission 

limitation; and reporting any 12-

hour rolling average concentration 

of reduced sulfur greater than the 

applicable emission limitation in 

the semiannual compliance report 

required by §63.1575. 

2. Option 1: Elect NSPS. 

Each new or existing sulfur 

recovery unit (Claus or other 

type, regardless of size) not 

subject to the NSPS for 

sulfur oxides in 40 CFR 

60.104(a)(2) or in 40 CFR 

60.102a(f)(1). 

a. 250 ppmv (dry basis) of 

SO2 at zero percent excess 

air, or concentration 

determined using Equation 

1 of 40 CFR 

60.102a(f)(1)(i), if you use 

an oxidation or reduction 

control system followed by 

incineration. 

Collecting the hourly average SO2

data (dry basis, percent excess air) 

according to §63.1572; determining 

and recording each 12-hour rolling 

average concentration of SO2; 

maintaining each 12-hour rolling 

average concentration of SO2 at or 

below the applicable emission 

limitation; and reporting any 12-

hour rolling average concentration 

of SO2 greater than the applicable 

emission limitation in the 

semiannual compliance report 

required by §63.1575. 

 b. 300 ppmv of reduced 

sulfur compounds calculated 

as ppmv SO2 (dry basis) at 

zero percent excess air, or 

concentration determined 

using Equation 1 of 40 CFR 

60.102a(f)(1)(i), if you use a 

reduction control system 

without incineration. 

Collecting the hourly average 

reduced sulfur (and air or O2

dilution and oxidation) monitoring 

data according to §63.1572; 

determining and recording each 12-

hour rolling average concentration 

of reduced sulfur; maintaining each 

12-hour rolling average 

concentration of reduced sulfur at 

or below the applicable emission 

limitation; and reporting any 12-

hour rolling average concentration 

of reduced sulfur greater than the 

applicable emission limitation in 

the semiannual compliance report 

required by §63.1575. 
145 

For . . . For this emission limit . . .

You shall demonstrate 

continuous compliance by . . . 

3. Option 2: TRS limit. Each 

new or existing sulfur 

recovery unit (Claus or other 

type, regardless of size) not 

subject to the NSPS for 

sulfur oxides in 40 CFR 

60.104(a)(2) or in 40 CFR 

60.102a(f)(1). 

300 ppmv of TRS 

compounds, expressed as an 

SO2 concentration (dry basis) 

at zero percent oxygen or 

reduced sulfur compounds 

calculated as ppmv SO2 (dry 

basis) at zero percent excess 

air. 

i. If you use continuous parameter 

monitoring systems, collecting the 

hourly average TRS monitoring 

data according to §63.1572 and 

maintaining each 12-hour average 

concentration of TRS at or below 

the applicable emission limitation; 

or 

 ii. If you use a continuous emission 

monitoring system, collecting the 

hourly average TRS monitoring 

data according to §63.1572, 

determining and recording each 12-

hour rolling average concentration 

of TRS; maintaining each 12-hour 

rolling average concentration of 

TRS at or below the applicable 

emission limitation; and reporting 

any 12-hour rolling average TRS 

concentration greater than the 

applicable emission limitation in 

the semiannual compliance report 

required by §63.1575. 

Table 35 to Subpart UUU of Part 63—Continuous Compliance With Operating Limits for 

HAP Emissions From Sulfur Recovery Units 

As stated in §63.1568(c)(1), you shall meet each requirement in the following table that applies 

to you. 

For . . . 

For this operating limit . 

. . 

You shall demonstrate 

continuous compliance by . . .

1. Each new or existing Claus 

sulfur recovery unit part of a sulfur 

recovery plant ofwith design 

capacity greater than 20 long tons 

per day or more and subject to the 

NSPS for sulfur oxides in 

paragraph 40 CFR 60.104(a)(2) or 

in 40 CFR 60.102a(f)(1). 

Not applicable Meeting the requirements of 

Table 34 of this subpart. 
146 

For . . . 

For this operating limit . 

. . 

You shall demonstrate 

continuous compliance by . . .

2. Option 1: Elect NSPS Each new 

or existing sulfur recovery unit 

(Claus or other type, regardless of 

size) not subject to the NSPS for 

sulfur oxides in 40 CFR 

60.104(a)(2) or in 40 CFR 

60.102a(f)(1).

Not applicable Meeting the requirements of 

Table 34 of this subpart. 

3. Option 2: TRS limit Each new or 

existing sulfur recovery unit (Claus 

or other type, regardless of size) not 

subject to the NSPS for sulfur 

oxides in 40 CFR 60.104(a)(2) or 

in 40 CFR 60.102a(f)(1).

a. Maintain the daily 

average combustion zone 

temperature above the 

level established during 

the performance test. 

Collecting the hourly and daily 

average temperature monitoring 

data according to §63.1572; and 

maintaining the daily average 

combustion zone temperature at 

or above the limit established 

during the performance test. 

 b. The daily average 

oxygen concentration in 

the vent stream (percent, 

dry basis) must not fall 

below the level 

established during the 

performance test. 

Collecting the hourly and daily 

average O2 monitoring data 

according to §63.1572; and 

maintaining the average O2

concentration above the level 

established during the 

performance test. 

Table 36 to Subpart UUU of Part 63—Work Practice Standards for HAP Emissions From 

Bypass Lines 

As stated in §63.1569(a)(1), you shall meet each work practice standard in the following table 

that applies to you. 

Option You shall meet one of these equipment standards . . . 

1. Option 1 Install and operate a device (including a flow indicator, level recorder, or electronic 

valve position monitor) to demonstrate, either continuously or at least every hour, 

whether flow is present in the by bypass line. Install the device at or as near as 

practical to the entrance to any bypass line that could divert the vent stream away 

from the control device to the atmosphere. 

2. Option 2 Install a car-seal or lock-and-key device placed on the mechanism by which the 

bypass device flow position is controlled (e.g., valve handle, damper level) when the 

bypass device is in the closed position such that the bypass line valve cannot be 

opened without breaking the seal or removing the device. 

3. Option 3 Seal the bypass line by installing a solid blind between piping flanges. 

4. Option 4 Vent the bypass line to a control device that meets the appropriate requirements in 

this subpart. 
147 

Table 37 to Subpart UUU of Part 63—Requirements for Performance Tests for Bypass 

Lines 

As stated in §63.1569(b)(1), you shall meet each requirement in the following table that applies 

to you. 

For this standard . . . You shall . . . 

1. Option 1: Install and 

operate a flow indicator, 

level recorder, or electronic 

valve position monitor. 

Record during the performance test for each type of control device 

whether the flow indicator, level recorder, or electronic valve 

position monitor was operating and whether flow was detected at 

any time during each hour of level the three runs comprising the 

performance test. 

Table 38 to Subpart UUU of Part 63—Initial Compliance With Work Practice Standards 

for HAP Emissions From Bypass Lines 

As stated in §63.1569(b)(2), you shall meet each requirement in the following table that applies 

to you. 

Option . . . For this work practice standard . . . 

You have demonstrated 

initial compliance if . . . 

1. Each new or 

existing bypass line 

associated with a 

catalytic cracking 

unit, catalytic 

reforming unit, or 

sulfur recovery unit 

a. Option 1: Install and operate a device 

(including a flow indicator, level recorder, 

or electronic valve position monitor) to 

demonstrate, either continuously or at 

least every hour, whether flow is present 

in bypass line. Install the device at or as 

near as practical to the entrance to any 

bypass line that could divert the vent 

stream away from the control device to 

the atmosphere 

The installed equipment 

operates properly during each 

run of the performance test and 

no flow is present in the line 

during the test. 

 b. Option 2: Install a car-seal or lock-andkey device placed on the mechanism by 

which the bypass device flow position is 

controlled (e.g., valve handle, damper 

level) when the bypass device is in the 

closed position such that the bypass line 

valve cannot be opened without breaking 

the seal or removing the device 

As part of the notification of 

compliance status, you certify 

that you installed the 

equipment, the equipment was 

operational by your compliance 

date, and you identify what 

equipment was installed. 

 c. Option 3: Seal the bypass line by 

installing a solid blind between piping 

flanges 

See item 1.b of this table. 
148 

Option . . . For this work practice standard . . . 

You have demonstrated 

initial compliance if . . . 

 d. Option 4: Vent the bypass line to a 

control device that meets the appropriate 

requirements in this subpart 

See item 1.b of this table. 

Table 39 to Subpart UUU of Part 63—Continuous Compliance With Work Practice 

Standards for HAP Emissions From Bypass Lines 

As stated in §63.1569(c)(1), you shall meet each requirement in the following table that applies 

to you. 

If you elect this 

standard . . . You shall demonstrate continuous compliance by . . . 

1. Option 1: Flow 

indicator, level 

recorder, or electronic 

valve position 

monitor. 

Monitoring and recording on a continuous basis or at least every hour 

whether flow is present in the bypass line; visually inspecting the device 

at least once every hour if the device is not equipped with a recording 

system that provides a continuous record; and recording whether the 

device is operating properly and whether flow is present in the bypass 

line. 

2. Option 2: Car-seal 

or lock-and-key device 

Visually inspecting the seal or closure mechanism at least once every 

month; and recording whether the bypass line valve is maintained in the 

closed position and whether flow is present in the line. 

3. Option 3: Solid 

blind flange 

Visually inspecting the blind at least once a month; and recording 

whether the blind is maintained in the correct position such that the vent 

stream cannot be diverted through the bypass line. 

4. Option 4: Vent to 

control device 

Monitoring the control device according to appropriate subpart 

requirements. 

5. Option 1, 2, 3, or 4 Recording and reporting the time and duration of any bypass. 

Table 40 to Subpart UUU of Part 63—Requirements for Installation, Operation, and 

Maintenance of Continuous Opacity Monitoring Systems and Continuous Emission 

Monitoring Systems 

As stated in §63.1572(a)(1) and (b)(1), you shall meet each requirement in the following table 

that applies to you. 

This type of continuous opacity or 

emission monitoring system . . . Must meet these requirements . . . 

1. Continuous opacity monitoring system Performance specification 1 (40 CFR part 60, 

Aappendix B). 
149 

This type of continuous opacity or 

emission monitoring system . . . Must meet these requirements . . . 

2. PM CEMS; this monitor must 

include an O2 monitor for correcting 

the data for excess air. 

The requirements in 40 CFR 60.105a(d). 

3. CO2, O2, and CO monitors for coke 

burn-off rate 

The requirements in 40 CFR 60.105a(b)(2). 

24. CO continuous emission monitoring 

system 

Performance specification 4 (40 CFR part 60, 

Aappendix B); span value of 1,000 ppm; and 

procedure 1 (40 CFR part 60, Aappendix F) except 

relative accuracy test audits are required annually 

instead of quarterly. 

35. CO continuous emission monitoring 

system used to demonstrate emissions 

average under 50 ppm (dry basis). 

Performance specification 4 (40 CFR part 60, 

Aappendix B); and span value of 100 ppm. 

46. SO2 continuous emission monitoring 

system for sulfur recovery unit with 

oxidation control system or reduction 

control system; this monitor must include 

an O2 monitor for correcting the data for 

excess air. 

Performance specification 2 (40 CFR part 60, 

aAppendix B); span value of 500 ppm SO2, or if 

using Equation 1 of 40 CFR 60.102a(f)(1)(i), span 

value of two times the limit at the highest O2

concentration; use Methods 6 or 6C (40 CFR part 

60, Appendix A-4) for certifying the SO2 monitor 

and Methods 3A or 3B (40 CFR part 60, aAppendix 

A-2) for certifying the O2 monitor; and procedure 1 

(40 CFR part 60, aAppendix F) except relative 

accuracy test audits are required annually instead of 

quarterly. 

57. Reduced sulfur and O2 continuous 

emission monitoring system for sulfur 

recovery unit with reduction control 

system not followed by incineration; this 

monitor must include an O2 monitor for 

correcting the data for excess air unless 

exempted. 

Performance specification 5 (40 CFR part 60, 

aAppendix B), except calibration drift specification is 

2.5 percent of the span value instead of 5 percent; 

span value is 450 ppm reduced sulfur, or if using 

Equation 1 of 40 CFR 60.102a(f)(1)(i), span value 

of two times the limit at the highest O2

concentration; use Methods 15 or 15A (40 CFR 

part 60, Appendix A-5) for certifying the reduced 

sulfur monitor and Methods 3A or 3B (40 CFR part 

60, aAppendix A-2) for certifying O2monitorthe O2

monitor; if Method 3A or 3B yields O2

concentrations below 0.25 percent during the 

performance evaluation, the O2 concentration can be 

assumed to be zero and the O2 monitor is not 

required; and procedure 1 (40 CFR part 60, 

aAppendix F), except relative accuracy test audits, 

are required annually instead of quarterly. 
150 

This type of continuous opacity or 

emission monitoring system . . . Must meet these requirements . . . 

68. Instrument with an air or O2 dilution 

and oxidation system to convert reduced 

sulfur to SO2 for continuously monitoring 

the concentration of SO2 instead of 

reduced sulfur monitor and O2 monitor. 

Performance specification 5 (40 CFR part 60, 

aAppendix B); span value of 375 ppm SO2 or if 

using Equation 1 of 40 CFR 60.102a(f)(1)(i), span 

value of two times the limit at the highest O2

concentration; use Methods 15 or 15A for 

certifying the reduced sulfur monitor and 3A or 3B 

for certifying the O2 monitor; and procedure 1 (40 

CFR part 60, aAppendix F), except relative accuracy 

test audits, are required annually instead of quarterly. 

79. TRS continuous emission monitoring 

system for sulfur recovery unit; this 

monitor must include an O2 monitor for 

correcting the data for excess air. 

Performance specification 5 (40 CFR part 60, 

Aappendix B). 

810. O2 monitor for oxygen 

concentration. 

If necessary due to interferences, locate the oxygen 

sensor prior to the introduction of any outside gas 

stream; performance specification 3 (40 CFR part 60, 

Aappendix B; and procedure 1 (40 CFR part 60, 

Aappendix F), except relative accuracy test audits, 

are required annually instead of quarterly. 

11. O2 monitor for oxygen 

concentration in inlet or supply. 

Install, operate, and maintain each O2 monitor 

according to Performance Specification 3 of 

Appendix B to part 60; the span value for the O2

monitor must be selected between 20 and 100 

percent; conduct performance evaluations for O2

monitor according to Performance Specification 3 

of Appendix B to part 60, and must use Method 

3A or 3B of Appendix A-2 to part 60 for 

conducting relative accuracy evaluations; comply 

with applicable quality assurance procedures of 

Appendix F to part 60 for each monitor, including 

annual accuracy determinations for each O2

monitor and daily calibration drift 

determinations. 

Table 41 to Subpart UUU of Part 63—Requirements for Installation, Operation, and 

Maintenance of Continuous Parameter Monitoring Systems 

As stated in §63.1572(c)(1), you shall meet each requirement in the following table that applies 

to you. 
151 

If you use . . . You shall . . . 

1. pH strips Use pH strips with an accuracy of ±10 percent. 

2. pH meter Locate the pH sensor in a position that provides a representative 

measurement of pH; ensure the sample is properly mixed and 

representative of the fluid to be measured. 

Use a pH sensor with an accuracy of at least ±0.2 pH units. 

Check the pH meter’s calibration on at least one point at least 

once daily; check the pH meter’s calibration on at least two 

points at least once quarterly; at least monthly, inspect all 

components for integrity and all electrical components for 

continuity; record the results of each calibration check and 

inspection. 

23. Colormetric tube 

sampling system 

Use a colormetric tube sampling system with a printed numerical scale 

in ppmv, a standard measurement range of 1 to 10 ppmv (or 1 to 30 

ppmv if applicable), and a standard deviation for measured values of 

no more than ±15 percent. System must include a gas detection pump 

and hot air probe if needed for the measurement range. 

4. BLD Follow the requirements in 40 CFR 60.105a(c). 

5. Voltage, secondary 

current, or total power 

input sensors 

Use meters with an accuracy of at least ± 5 percent over the 

operating range. 

Each time that the unit is not operating, confirm that the meters 

read zero. Conduct a calibration check at least annually; 

conduct calibration checks following any period of more than 

24 hours throughout which the meter exceeds the 

manufacturer’s specified maximum operating range; at least 

monthly, inspect all components of the continuous parameter 

monitoring system for integrity and all electrical connections 

for continuity; and record the results of each calibration check 

and inspection. 

6. Pressure/Pressure 

drop 1 sensors 

Locate the pressure sensor(s) in a position that provides a 

representative measurement of the pressure; minimizes or 

eliminates pulsating pressure, vibration, and internal and 

external corrosion. 

Use a gauge with an accuracy of at least ± 5 percent over the 

operating range or 0.5 inches of water column, whichever is 

greater. 

Check pressure tap for plugs at least once a week; using a 

manometer, check gauge calibration quarterly and transducer 

calibration monthly; conduct calibration checks following any 

period of more than 24 hours throughout which the sensor 

exceeds the manufacturer’s specified maximum operating 

pressure range or install a new pressure sensor; at least 

monthly, inspect all components for integrity, all electrical 
152 

If you use . . . You shall . . . 

connections for continuity, and all mechanical connections for 

leakage; record the results of each calibration check and 

inspection. 

7. Air flow rate, gas 

flow rate, or total water 

(or scrubbing liquid) 

flow rate sensors 

Locate the flow sensor(s) and other necessary equipment (such as 

straightening vanes) in a position that provides representative 

flow; reduce swirling flow or abnormal velocity distributions 

due to upstream and downstream disturbances. If you elect to 

comply with Option 3 (Ni lb/hr) or Option 4 (Ni lb/1,000 lb of 

coke burn-off) for the HAP metal emission limitations in § 

63.1564, install the continuous parameter monitoring system 

for gas flow rate as close as practical to the continuous opacity 

monitoring system; and if you don’t use a continuous opacity 

monitoring system, install the continuous parameter 

monitoring system for gas flow rate as close as practical to the 

control device. 

Use a flow rate sensor with an accuracy of at least ±5 percent, or 

0.5 gallons per minute for liquid flow, or 10 cubic feet per 

minute for gas flow, whichever is greater. 

Conduct a flow sensor calibration check at least semiannually; 

conduct calibration checks following any period of more than 

24 hours throughout which the sensor exceeds the 

manufacturer’s specified maximum operating range or install 

a new flow sensor; at least monthly, inspect all components for 

leakage; record the results of each calibration check and 

inspection. 

8. Temperature sensors Locate the temperature sensor in the combustion zone, or in the 

ductwork immediately downstream of the combustion zone 

before any substantial heat exchange occurs or in the 

ductwork immediately downstream of the regenerator; locate 

the temperature sensor in a position that provides a 

representative temperature; shield the temperature sensor 

system from electromagnetic interference and chemical 

contaminants. 

Use a temperature sensor with an accuracy of at least ±1 percent 

of the temperature being measured, expressed in degrees 

Celsius (C) or 2.8 degrees C, whichever is greater. 

Conduct calibration checks at least annually; conduct calibration 

checks following any period of more than 24 hours throughout 

which the sensor exceeds the manufacturer’s specified 

maximum operating temperature range, or install a new 

temperature sensor; at least monthly, inspect all components 

for integrity and all electrical connections for continuity, 

oxidation, and galvanic corrosion; record the results of each 

calibration check and inspection. 
153 

If you use . . . You shall . . . 

9. Oxygen content 

sensors2

Locate the oxygen sensor so that it provides a representative 

measurement of the oxygen content of the exit gas stream; 

ensure the sample is properly mixed and representative of the 

gas to be measured. 

Use an oxygen sensor with an accuracy of at least ±1 percent of 

the range of the sensor. 

Conduct calibration checks at least quarterly; conduct calibration 

checks following any period of more than 24 hours throughout 

which the sensor exceeds the manufacturer’s specified 

maximum operating range, or install a new oxygen sensor; at 

least monthly, inspect all components for integrity and all 

electrical connections for continuity; record the results of each 

calibration and inspection. 

1

Not applicable to non-venturi wet scrubbers of the jet-ejector design. 

2

This does not replace the requirements for oxygen monitors that are required to use continuous emissions 

monitoring systems. These requirements apply to oxygen sensors that are continuous parameter monitors, 

such as those that monitor combustion zone oxygen concentration and regenerator exit oxygen concentration. 

Table 42 to Subpart UUU of Part 63—Additional Information for Initial Notification of 

Compliance Status 

As stated in §63.1574(d), you shall meet each requirement in the following table that applies to 

you. 

For . . . You shall provide this additional information . . . 

1. Identification of 

affected sources and 

emission points. 

Nature, size, design, method of operation, operating design capacity of 

each affected source; identify each emission point for each HAP; identify 

any affected source or vent associated with an affected source not subject 

to the requirements of subpart UUU. 

2. Initial compliance Identification of each emission limitation you will meet for each affected 

source, including any option you select (i.e., NSPS, PM or Ni, flare, 

percent reduction, concentration, options for bypass lines); if applicable, 

certification that you have already conducted a performance test to 

demonstrate initial compliance with the NSPS for an affected source; 

certification that the vents meet the applicable emission limit and the 

continuous opacity or that the emission monitoring system meets the 

applicable performance specification; if applicable, certification that you 

have installed and verified the operational status of equipment by your 

compliance date for each bypass line that meets the requirements of 

Option 2, 3, or 4 in §63.1569 and what equipment you installed; 

identification of the operating limit for each affected source, including 

supporting documentation; if your affected source is subject to the NSPS, 
154 

For . . . You shall provide this additional information . . . 

certification of compliance with NSPS emission limitations and 

performance specifications; a brief description of performance test 

conditions (capacity, feed quality, catalyst, etc.); an engineering 

assessment (if applicable); and if applicable, the flare design (e.g., steamassisted, air-assisted, or non-assisted), all visible emission readings, heat 

content determinations, flow rate measurements, and exit velocity 

determinations made during the Method 22 test. 

3. Continuous 

compliance 

Each monitoring option you elect; and identification of any unit or vent 

for which monitoring is not required; and the definition of “operating 

day.” (This definition, subject to approval by the applicable permitting 

authority, must specify the times at which a 24-hr operating day begins 

and ends.) 

Table 43 to Subpart UUU of Part 63—Requirements for Reports 

As stated in §63.1575(a), you shall meet each requirement in the following table that applies to 

you. 

You must 

submit a(n) 

. . . . . The report must contain . . . 

You shall submit the 

report . . . 

1. 

ComplianceA 

compliance

report 

If there are not deviations from any emission limitation 

or work practice standard that applies to you, a 

statement that there were no deviations from the 

standards during the reporting period and that no 

continuous opacity monitoring system or continuous 

emission monitoring system was inoperative, inactive, 

out-of-control, repaired, or adjusted; if you have a 

deviation from any emission limitation or work 

practice standard during the reporting period, the 

report must contain the information in §63.1575(c) 

through (e).

Semiannually according 

to the requirements in 

§63.1575(b). 

2. 

Performance 

test and 

CEMS 

performance 

evaluation 

data

On and if you have a deviation from any emission 

limitation or work practice standard during the 

reporting period, the report must containafter [THE 

DATE 3 YEARS AFTER THE DATE OF 

PUBLICATION OF THE FINAL RULE 

AMENDMENTS IN THE FEDERAL REGISTER],

the information specified in §63.1575(d) or (e)k)(1).

Within 60 days after 

the date of completing 

each test according to 

the requirements in 

§63.1575(k).
155 

Table 44 to Subpart UUU of Part 63—Applicability of NESHAP General Provisions to 

Subpart UUU 

As stated in §63.1577, you shall meet each requirement in the following table that applies to you. 

Citation Subject 

Applies to 

subpart 

UUU Explanation 

§63.1(a)(1)–(4) General Applicability Yes 

§63.1(a)(5) [Reserved] Not 

applicable 

§63.1(a)(6) Yes Except the correct mail drop 

(MD) number is C404–04. 

§63.1(a)(7)–(9) [Reserved] Not 

applicable 

§63.1(a)(10)–(12) Applicability Yes Except that subpart UUU 

specifies calendar or operating 

day. 

§63.1(b)(1) Initial Applicability 

Determination for this part

Yes 

§63.1(b)(2) [Reserved] Not 

applicable 

§63.1(b)(3) Yes 

§63.1(c)(1) Applicability of this part 

after a Relevant Standard 

has been set under this part

Yes 

§63.1(c)(2) No Area sources are not subject 

to subpart UUU. 

§63.1(c)(3)–(4) [Reserved] Not 

applicable 

§63.1(c)(5) Yes 

§63.1(d) [Reserved] Not 

applicable 

§63.1(e) Applicability of Permit 

Program 

Yes 

§63.2 Definitions Yes §63.1579 of subpart UUU 

specifies that if the same term 

is defined in subparts A and 

UUU, it shall have the 

meaning given in subpart 

UUU.
156 

Citation Subject 

Applies to 

subpart 

UUU Explanation 

§63.3 Units and Abbreviations Yes 

§63.4(a)(1)–(2) Prohibited Activities Yes 

§63.4(a)(3)–(5) [Reserved] Not 

applicable 

§63.4(b)–(c) Circumvention and 

Fragmentation 

Yes 

§63.5(a) Construction and 

Reconstruction

Yes 

§63.5(b)(1) Yes 

§63.5(b)(2) [Reserved] Not 

applicable 

§63.5(A)–(Cb)(3)–

(4) 

Construction and 

Reconstruction

Yes In §63.5(b)(4), replace the 

reference to §63.9(b) with 

§63.9(b)(4) and (5). 

§63.5(b)(5) [Reserved] Not 

applicable 

§63.5(b)(6) Yes 

§63.5(c) [Reserved] Not 

applicable 

§63.5(d)(1)(i) Application for Approval of 

Construction or 

Reconstruction—General 

Application Requirements 

Yes Except, subpart UUU specifies 

the application is submitted as 

soon as practicable before 

startup but not later than 90 

days (rather then 60) after the 

promulgation date whereif

construction or reconstruction 

had commenced and initial 

startup had not occurred before 

promulgation. 

§63.5(d)(1)(ii) Yes Except that emission estimates 

specified in §63.5(d)(1)(ii)(H) 

are not required, and 

§63.5(d)(1)(ii)(G) and (I) are 

Reserved and do not apply. 

§63.5(d)(1)(iii) No Subpart UUU specifies 

submission of notification of 

compliance status. 

§63.5(d)(2) NoYes
157 

Citation Subject 

Applies to 

subpart 

UUU Explanation 

§63.5(d)(3) Yes Except that §63.5(d)(3)(ii) does 

not apply.

§63.5(d0)(4) Yes 

§63.5(e) Approval of Construction or 

Reconstruction 

Yes 

§63.5(f)(1) Approval of Construction or 

Reconstruction Based on 

State Review 

Yes

§63.5(f)(2) Yes Except that 60 days is changed 

to 90 days andthe crossreference to 53§63.9(Bb)(2) 

does not apply. 

§63.6(a) Compliance with Standards 

and Maintenance—

Applicability 

Yes 

§63.6(b)(1)–(4) Compliance Dates for New 

and Reconstructed Sources 

Yes 

§63.6(b)(5) Yes Except that subpart UUU 

specifies different compliance 

dates for sources. 

§63.6(b)(6) [Reserved] Not 

applicable 

§63.6(b)(7) Compliance Dates for New 

and Reconstructed Area 

Sources That Become Major 

Yes 

§63.6(c)(1)–(2) Compliance Dates for 

Existing Sources 

Yes Except that subpart UUU 

specifies different compliance 

dates for sources subject to Tier 

II gasoline sulfur control 

requirements. 

§63.6(c)(3)–(4) [Reserved] Not 

applicable 

§63.6(c)(5) Compliance Dates for 

Existing Area Sources That 

Become Major 

Yes 

§63.6(d) [Reserved] Not 

applicable 
158 

Citation Subject 

Applies to 

subpart 

UUU Explanation 

§63.6(e)(1)(i) General Duty to Minimize 

Emissions 

No See §63.1570(c) for general 

duty requirement. 

§63.6(e)(1)(ii) Requirement to Correct 

Malfunctions as Soon as 

Possible 

No 

§63.6(e)(1)–(2)(iii) OperationCompliance with 

Standards and Maintenance 

Requirements 

Yes 

§63.6(e)(2) [Reserved] Not 

Applicable

§63.6(e)(3)(i)–(iii) Startup, Shutdown, and 

Malfunction Plan

Requirements

YesNo

§63.6(e)(3)(ivii) [Reserved] YesNot 

applicable

Except that reports of actions 

not consistent with plan are not 

required within 2 and 7 days of 

action but rather must be 

included in next periodic report.

§63.6(e)(3)(v)–

(viiiiii)-(ix) 

YesNo The owner or operator is only 

required to keep the latest 

version of the plan.

§63.6(e)(3)(ixf)(1) SSM Exemption YesNo

§63.6(f)(1)–(2)(i)–

(iii)(C) 

Compliance with Emission 

Standards and Maintenance 

Requirements

Yes 

§63.6(f)(2)(iii)(D) NoYes

§63.6(f)(2)(iv)–(v) Yes 

§63.6(f)(3) Yes Except the cross-references to 

§63.6(f)(1) and §63.6(e)(1)(i) 

are changed to §63.1570(c).

§63.6(g) Alternative Standard Yes 

§63.6(h)(1) SSM Exemption for 

Opacity/VE Standards 

YesNo

§63.6(h)(2)(i) Determining Compliance 

with Opacity/VE Standards 

No Subpart UUU specifies 

methods. 

§63.6(h)(2)(ii) [Reserved] Not 

applicable 
159 

Citation Subject 

Applies to 

subpart 

UUU Explanation 

§63.6(h)(2)(iii) Yes 

§63.6(h)(3) [Reserved] Not 

applicable 

§63.6(h)(4) Notification of Opacity/VE 

Observation Date 

Yes Applies to Method 22 tests. 

§63.6(h)(5) Conducting Opacity/VE 

Observations 

No 

§63.6(h)(6) Records of Conditions 

During Opacity/VE 

Observations 

Yes Applies to Method 22 

observations. 

§63.6(h)(7)(i) Report COM Monitoring 

Data from Performance Test 

Yes 

§63.6(h)(7)(ii) Using COM Instead of 

Method 9 

No 

§63.6(h)(7)(iii) Averaging Time for COM 

during Performance Test 

Yes 

§63.6(h)(7)(iv) COM Requirements Yes 

§63.6(h)(7)(v) COMS Results and Visual 

Observations 

Yes 

§63.6(h)(8) Determining Compliance 

with Opacity/VE Standards 

Yes 

§63.6(h)(9) Adjusted Opacity Standard Yes 

§63.6(i)(1)–(14) Extension of Compliance Yes Extension of compliance under 

§63.6(i)(4) not applicable to a 

facility that installs catalytic 

cracking feed hydrotreating and 

receives an extended 

compliance date under 

§63.1563(c). 

§63.6(i)(15) [Reserved] Not 

applicable 

§63.6(i)(16) Yes 

§63.6(j) Presidential Compliance 

Exemption 

Yes 

§63.7(a)(1) Performance Test 

Requirements Applicability 

Yes Except that subpart UUU 

specifies the applicable test and 

demonstration procedures. 
160 

Citation Subject 

Applies to 

subpart 

UUU Explanation 

§63.7(a)(2) Performance Test Dates NoYes TestExcept test results must be 

submitted in the Notification of 

Compliance Status report due 

150 days after the compliance 

date. 

§63.7(a)(3) Section 114 Authority Yes 

§63.7(a)(4) Force Majeure Yes 

§63.7(b) Notifications Yes Except that subpart UUU 

specifies notification at least 30 

days prior to the scheduled test 

date rather than 60 days. 

§63.7(c) Quality Assurance 

Program/Site-Specific Test 

Plan 

Yes 

§63.7(d) Performance Test Facilities Yes 

§63.7(e)(1) Performance Testing No See §63.1571(b)(1). 

§63.7(e)(2)–(4) Conduct of Tests Yes 

§63.7(f) Alternative Test Method Yes 

§63.7(g) Data Analysis, 

Recordkeeping, Reporting 

Yes Except performance test reports 

must be submitted with 

notification of compliance 

status due 150 days after the 

compliance date, and 

§63.7(g)(2) is Reserved and 

does not apply. 

§63.7(h) Waiver of Tests Yes 

§63.8(a)(1) Monitoring RequirementsApplicability Yes 

§63.8(a)(2) Performance Specifications Yes 

§63.8(a)(3) [Reserved] Not 

applicable 

§63.8(a)(4) Monitoring with Flares Yes Except that for a flare 

complying with §63.670, the 

cross-reference to §63.11 in 

this paragraph does not 

include §63.11(b).

§63.8(b)(1) Conduct of Monitoring Yes 
161 

Citation Subject 

Applies to 

subpart 

UUU Explanation 

§63.8(b)(2)–(3) Multiple Effluents and 

Multiple Monitoring Systems

Yes Subpart UUU specifies the 

required monitoring locations. 

§63.8(c)(1) Monitoring System 

Operation and Maintenance 

Yes 

§63.8(c)(1)(i)–(ii) Startup, Shutdown, and 

MalfunctionsGeneral Duty 

to Minimize Emissions and 

CMS Operation

YesNo Except that subpart UUU 

specifies that reports are not 

required if actions are 

consistent with the SSM plan, 

unless requested by the 

permitting authority. If actions 

are not consistent, actions must 

be described in next compliance 

report.See §63.1570(c).

§63.8(c)(1)(ii) Keep Necessary Parts for 

CMS 

Yes 

§63.8(c)(1)(iii) Compliance with Operation 

and Maintenance 

RequirementsRequirement 

to Develop SSM Plan for 

CMS 

YesNo

§63.8(c)(2)–(3) Monitoring System 

Installation 

Yes Except that subpart UUU 

specifies that for continuous 

parameter monitoring systems, 

operational status verification 

includes completion of 

manufacturer written 

specifications or installation, 

operation, and calibration of the 

system or other written 

procedures that provide 

adequate assurance that the 

equipment will monitor 

accurately. 

§63.8(c)(4) Continuous Monitoring 

System Requirements 

NoYes Subpart UUU specifies 

operational requirements.

§63.8(c)(4)(i)–(ii) Continuous Monitoring 

System Requirements

Yes Except that these requirements 

apply only to a continuous 

opacity monitoring system or a 

continuous emission 

monitoring system if you are 
162 

Citation Subject 

Applies to 

subpart 

UUU Explanation 

subject to the NSPS or elect to 

comply with the NSPS opacity, 

CO, or SO2 limits.

§63.8(c)(5) COMS Minimum Procedures Yes 

§63.8(c)(6) CMS Requirements NoYes Except that these requirements 

apply only to a continuous 

opacity monitoring system or 

continuous emission 

monitoring system if you are 

subject to the NSPS or elect to 

comply with the NSPS opacity, 

CO, or SO2 limits.

§63.8(c)(7)–(8) CMS Requirements Yes 

§63.8(d)(1)–(2) Quality Control Program for 

CMS

Yes Except that these requirements 

apply only to a continuous 

opacity monitoring system or 

continuous emission 

monitoring system if you are 

subject to the NSPS or elect to 

comply with the NSPS opacity, 

CO, or SO2 limits.

§63.8(d)(3) Written Procedures for 

CMS 

No 

§63.8(e) CMS Performance 

Evaluation 

Yes Except that these requirements 

apply only to a continuous 

opacity monitoring system or 

continuous emission 

monitoring system if you are 

subject to the NSPS or elect to 

comply with the NSPS opacity, 

CO, or SO2 limits. 

ResultsExcept that results are 

to be submitted as part of the 

Notification Compliance Status 

due 150 days after the 

compliance date. 

§63.8(f)(1)–(5) Alternative Monitoring 

Methods 

Yes Except that subpart UUU 

specifies procedures for 

requesting alternative 

monitoring systems and 
163 

Citation Subject 

Applies to 

subpart 

UUU Explanation 

alternative parameters. 

§63.8(f)(6) Alternative to Relative 

Accuracy Test 

Yes Applicable to continuous 

emission monitoring systems if 

performance specification 

requires a relative accuracy test 

audit. 

§63.8(g)(1)–(4) Reduction of Monitoring 

Data 

Yes Applies to continuous opacity 

monitoring system or 

continuous emission 

monitoring system. 

§63.8(g)(5) Data Reduction No Subpart UUU specifies 

requirements. 

§63.9(a) Notification Requirements—

Applicability 

Yes Duplicate Notification of 

Compliance Status report to the 

Regional Administrator may be 

required. 

§63.9(b)(1)–(2), 

(4)–(5) 

Initial Notifications Yes Except that notification of 

construction or reconstruction 

is to be submitted as soon as 

practicable before startup but 

no later than 30 days (rather 

than 60 days) after the effective 

date if construction or 

reconstruction had commenced 

but startup had not occurred 

before the effective date. 

§63.9(b)(3) [Reserved] Not 

applicable

§63.9(b)(4)–(5) Initial Notification 

Information 

Yes Except §63.9(b)(4)(ii)-(iv), 

which are Reserved and do 

not apply. 

§63.9(c) Request for Extension of 

Compliance 

Yes 

§63.9(d) New Source Notification for 

Special Compliance 

Requirements 

Yes 

§63.9(e) Notification of Performance 

Test 

Yes Except that notification is 

required at least 30 days before 

test. 
164 

Citation Subject 

Applies to 

subpart 

UUU Explanation 

§63.9(f) Notification of VE/Opacity 

Test 

Yes 

§63.9(g) Additional Notification 

Requirements for Sources 

with Continuous Monitoring 

Systems 

Yes Except that these requirements 

apply only to a continuous 

opacity monitoring system or 

continuous emission 

monitoring system if you are 

subject to the NSPS or elect to 

comply with the NSPS opacity, 

CO, or SO2 limits.

§63.9(h) Notification of Compliance 

Status 

Yes Except that subpart UUU 

specifies the notification is due 

no later than 150 days after 

compliance date, and except 

that the reference to 

§63.5(d)(1)(ii)(H) in 

§63.9(h)(5) does not apply. 

§63.9(i) Adjustment of Deadlines Yes 

§63.9(j) Change in Previous 

Information 

Yes 

63.10(a) Recordkeeping and 

Reporting Applicability 

Yes 

§63.10(b)(1) General Recordkeeping 

Requirements 

Yes 

§63.10(b)(2)(i) Recordkeeping of 

Occurrence and Duration 

of Startups and Shutdowns 

No 

§63.10(b)(2)(ii) RecordsRecordkeeping of 

Malfunctions

YesNo Except that §63.10(b)(2)(xiii) 

applies if you use a continuous 

emission monitoring system to 

meet the NSPS or you select to 

meet the NSPS, CO, or SO2

reduced sulfur limit and the 

performance evaluation 

requires a relative accuracy test 

audit.See §63.1576(a)(2) for 

recordkeeping of (1) date, 

time and duration; (2) listing 

of affected source or 

equipment, and an estimate of 
165 

Citation Subject 

Applies to 

subpart 

UUU Explanation 

the volume of each regulated 

pollutant emitted over the 

standard; and (3) actions 

taken to minimize emissions 

and correct the failure.

§63.10(b)(2)(iii) Maintenance Records Yes 

§63.10(b)(2)(iv)–

(v) 

Actions Taken to Minimize 

Emissions During SSM 

No 

§63.10(b)(2)(vi) Recordkeeping for CMS 

Malfunctions 

Yes 

§63.10(b)(2)(vii)–

(xiv) 

Other CMS Requirements Yes 

§63.10(b)(3) Recordkeeping for 

Applicability 

Determinations. 

Yes 

§63.10(c)(1)–(6), 

(9)–(15) 

Additional Records for 

Continuous Monitoring 

Systems 

Yes Except that these requirements 

apply if you use a continuous 

opacity monitoring system or a 

continuous emission 

monitoring system to meet the 

NSPS or elect to meet the 

NSPS opacity, CO, or SO2

limits.Except §63.10(c)(2)-(4), 

which are Reserved and do 

not apply.

§63.10(c)(7)–(8) Records of Additional 

Recordkeeping 

Requirements for CMS – 

Identifying Exceedances 

and Excess Emissions and 

Exceedances

NoYes Subpart UUU specifies 

requirements.

§63.10(c)(9) [Reserved] Not 

applicable 

 §63.10(c)(10) Recording Nature and 

Cause of Malfunctions 

No See §63.1576(a)(2) for 

malfunctions recordkeeping 

requirements. 

§63.10(c)(11) Recording Corrective 

Actions 

No See §63.1576(a)(2) for 

malfunctions recordkeeping 

requirements. 
166 

Citation Subject 

Applies to 

subpart 

UUU Explanation 

§63.10(c)(12)–(14) Additional CMS 

Recordkeeping 

Requirements 

Yes 

§63.10(c)(15) Use of SSM Plan No 

§63.10(d)(1) General Reporting 

Requirements 

Yes 

§63.10(d)(2) Performance Test Results No Subpart UUU requires 

performance test results to be 

reported as part of the 

Notification of Compliance 

Status due 150 days after the 

compliance date. 

§63.10(d)(3) Opacity or VE Observations Yes 

§63.10(d)(4) Progress Reports Yes 

§63.10(d)(5)(i) Startup, Shutdown, and 

Malfunction Reports

Yes Except that reports are not 

required if actions are 

consistent with the SSM plan, 

unless requested by permitting 

authority.

§63.10(d)(5)(ii) SSM Reports YesNo Except that actions taken during 

a startup, shutdown, or 

malfunction that are not 

consistent with the plan do not 

need to be reported within 2 

and 7 days of commencing and 

completing the action, 

respectively, but must be 

included in the next periodic 

report.See §63.1575(d) for 

CPMS malfunction reporting 

and §63.1575(e) for COMS 

and CEMS malfunction 

reporting.

§63.10(e)(1)–(2) Additional CMS Reports Yes Except that these requirements 

apply only to a continuous 

opacity monitoring system or 

continuous emission 

monitoring system if you are 

subject to the NSPS or elect to 

comply with the NSPS opacity, 
167 

Citation Subject 

Applies to 

subpart 

UUU Explanation 

CO, or SO2 limits. 

Reportsreports of performance 

evaluations must be submitted 

in Notification of Compliance 

Status. 

§63.10(e)(3) Excess Emissions/CMS 

Performance Reports 

No Subpart UUU specifies the 

applicable requirements. 

§63.10(e)(4) COMS Data Reports Yes 

§63.10(f) Recordkeeping/Reporting 

Waiver 

Yes 

§63.11(a) Control Device and Work 

Practice Requirements

Applicability

Yes Applicable to flares.

§63.11(b) Flares Yes Except that flares complying 

with §63.670 are not subject 

to the requirements of 

§63.11(b). 

§63.11(c)-(e) Alternative Work Practice 

for Monitoring Equipment 

for Leaks 

Yes 

§63.12 State Authority and 

Delegations 

Yes 

§63.13 Addresses Yes 

§63.14 Incorporation by Reference Yes 

§63.15 Availabileity of Information

and Confidentiality

Yes 

§63.16 Performance Track 

Provisions 

Yes 

Appendix A to Subpart UUU of Part 63—Determination of Metal Concentration on 

Catalyst Particles (Instrumental Analyzer Procedure) 

1.0 Scope and Application. 

1.1 Analytes. The analytes for which this method is applicable include any elements with an 

atomic number between 11 (sodium) and 92 (uranium), inclusive. Specific analytes for which 

this method was developed include: 
168 

Analyte CAS No. Minimum detectable limit 

Nickel compounds 7440–02–0 <2 % of span. 

Total chlorides 16887–00–6 <2 % of span. 

1.2 Applicability. This method is applicable to the determination of analyte concentrations on 

catalyst particles. This method is applicable for catalyst particles obtained from the fluid catalytic 

cracking unit (FCCU) regenerator (i.e., equilibrium catalyst), from air pollution control systems 

operated for the FCCU catalyst regenerator vent (FCCU fines), from catalytic reforming units 

(CRU), and other processes as specified within an applicable regulation. This method is 

applicable only when specified within the regulation. 

1.3 Data Quality Objectives. Adherence to the requirements of this method will enhance the 

quality of the data obtained from the analytical method. 

2.0 Summary of Method. 

2.1 A representative sample of catalyst particles is collected, prepared, and analyzed for analyte 

concentration using either energy or wavelength dispersive X-ray flouorescent (XRF) 

spectrometry instrumental analyzers. In both types of XRF spectrometers, the instrument 

irradiates the sample with high energy (primary) x-rays and the elements in the sample absorb 

the x-rays and then re-emit secondary (fluorescent) x-rays of characteristic wavelengths for each 

element present. In energy dispersive XRF spectrometers, all secondary x-rays (of all 

wavelengths) enter the detector at once. The detector registers an electric current having a height 

proportional to the photon energy, and these pulses are then separated electronically, using a 

pulse analyzer. In wavelength dispersive XRF spectrometers, the secondary x-rays are dispersed 

spatially by crystal diffraction on the basis of wavelength. The crystal and detector are made to 

synchronously rotate and the detector then receives only one wavelength at a time. The intensity 

of the x-rays emitted by each element is proportional to its concentration, after correcting for 

matrix effects. For nickel compounds and total chlorides, the XRF instrument response is 

expected to be linear to analyte concentration. Performance specifications and test procedures are 

provided to ensure reliable data. 

3.0 Definitions. 

3.1 Measurement System. The total equipment required for the determination of analyte 

concentration. The measurement system consists of the following major subsystems: 

3.1.1 Sample Preparation. That portion of a system used for one or more of the following: 

sample acquisition, sample transport, sample conditioning, or sample preparation prior to 

introducing the sample into the analyzer. 

3.1.2 Analyzer. That portion of the system that senses the analyte to be measured and generates 

an output proportional to its concentration. 

3.1.3 Data Recorder. A digital recorder or personal computer used for recording measurement 

data from the analyzer output. 
169 

3.2 Span. The upper limit of the gas concentration measurement range displayed on the data 

recorder. 

3.3 Calibration Standards. Prepared catalyst samples or other samples of known analyte 

concentrations used to calibrate the analyzer and to assess calibration drift. 

3.4 Energy Calibration Standard. Calibration standard, generally provided by the XRF 

instrument manufacturer, used for assuring accuracy of the energy scale. 

3.5 Accuracy Assessment Standard. Prepared catalyst sample or other sample of known analyte 

concentrations used to assess analyzer accuracy error. 

3.6 Zero Drift. The difference in the measurement system output reading from the initial value 

for zero concentration level calibration standard after a stated period of operation during which 

no unscheduled maintenance, repair, or adjustment took place. 

3.7 Calibration Drift. The difference in the measurement system output reading from the initial 

value for the mid-range calibration standard after a stated period of operation during which no 

unscheduled maintenance, repair, or adjustment took place. 

3.8 Spectral Interferences. Analytical interferences and excessive biases caused by elemental 

peak overlap, escape peak, and sum peak interferences between elements in the samples. 

3.9 Calibration Curve. A graph or other systematic method of establishing the relationship 

between the analyzer response and the actual analyte concentration introduced to the analyzer. 

3.10 Analyzer Accuracy Error. The difference in the measurement system output reading and the 

ideal value for the accuracy assessment standard. 

4.0 Interferences. 

4.1 Spectral interferences with analyte line intensity determination are accounted for within the 

method program. No action is required by the XRF operator once these interferences have been 

addressed within the method. 

4.2 The X-ray production efficiency is affected by particle size for the very lightest elements. 

However, particulate matter (PM) 2.5 particle size effects are substantially < 1 percent for most 

elements. The calibration standards should be prepared with material of similar particle size or 

be processed (ground) to produce material of similar particle size as the catalyst samples to be 

analyzed. No additional correction for particle size is performed. Alternatively, the sample can 

be fused in order to eliminate any potential particle size effects. 

5.0 Safety. 

5.1 Disclaimer. This method may involve hazardous materials, operations, and equipment. This 

test method may not address all of the safety problems associated with its use. It is the 

responsibility of the user of this test method to establish appropriate safety and health practices 

and determine the applicability of regulatory limitations prior to performing this test method. 
170 

5.2 X-ray Exposure. The XRF uses X-rays; XRF operators should follow instrument 

manufacturer's guidelines to protect from accidental exposure to X-rays when the instrument is 

in operation. 

5.3 Beryllium Window. In most XRF units, a beryllium (Be) window is present to separate the 

sample chamber from the X-ray tube and detector. The window is very fragile and brittle. Do not 

allow sample or debris to fall onto the window, and avoid using compressed air to clean the 

window because it will cause the window to rupture. If the window should rupture, note that Be 

metal is poisonous. Use extreme caution when collecting pieces of Be and consult the instrument 

manufacturer for advice on cleanup of the broken window and replacement. 

6.0 Equipment and Supplies. 

6.1 Measurement System. Use any measurement system that meets the specifications of this 

method listed in section 13. The typical components of the measurement system are described 

below. 

6.1.1 Sample Mixer/Mill. Stainless steel, or equivalent to grind/mix catalyst and binders, if used, 

to produce uniform particle samples. 

6.1.2 Sample Press/Fluxer. Stainless steel, or equivalent to produce pellets of sufficient size to 

fill analyzer sample window, or alternatively, a fusion device capable of preparing a fused disk 

of sufficient size to fill analyzer sample window. 

6.1.3 Analytical Balance. ±0.0001 gram accuracy for weighing prepared samples (pellets). 

6.1.4 Analyzer. An XRF spectrometer to determine the analyte concentration in the prepared 

sample. The analyzer must meet the applicable performance specifications in section 13. 

6.1.5 Data Recorder. A digital recorder or personal computer for recording measurement data. 

The data recorder resolution (i.e., readability) must be 0.5 percent of span. Alternatively, a digital 

or analog meter having a resolution of 0.5 percent of span may be used to obtain the analyzer 

responses and the readings may be recorded manually. 

7.0 Reagents and Standards. 

7.1 Calibration Standards. The calibration standards for the analyzer must be prepared catalyst 

samples or other material of similar particle size and matrix as the catalyst samples to be tested 

that have known concentrations of the analytes of interest. Preparation (grinding/milling/fusion) 

of the calibration standards should follow the same processes used to prepare the catalyst 

samples to be tested. The calibration standards values must be established as the average of a 

minimum of three analyses using an approved EPA or ASTM method with instrument analyzer 

calibrations traceable to the U.S. National Institute of Standards and Technology (NIST), if 

available. The maximum percent deviation of the triplicate calibration standard analyses should 

agree within 10 percent of the average value for the triplicate analysis (see Figure 1). If the 

calibration analyses do not meet this criteria, the calibration standards must be re-analyzed. If 

unacceptable variability persists, new calibration standards must be prepared. Approved methods 

for the calibration standard analyses include, but are not limited to, EPA Methods 6010B, 6020, 
171 

7520, or 7521 of SW–846.1

 Use a minimum of four calibration standards as specified below (see 

Figure 1): 

7.1.1 High-Range Calibration Standard. Concentration equivalent to 80 to 100 percent of the 

span. The concentration of the high-range calibration standard should exceed the maximum 

concentration anticipated in the catalyst samples. 

7.1.2 Mid-Range Calibration Standard. Concentration equivalent to 40 to 60 percent of the span. 

7.1.3 Low-Range Calibration Standard. Concentration equivalent to 1 to 20 percent of the span. 

The concentration of the low-range calibration standard should be selected so that it is less than 

either one-fourth of the applicable concentration limit or of the lowest concentration anticipated 

in the catalyst samples. 

7.1.4 Zero Calibration Standard. Concentration of less than 0.25 percent of the span. 

7.2 Accuracy Assessment Standard. Prepare an accuracy assessment standard and determine the 

ideal value for the accuracy assessment standard following the same procedures used to prepare 

and analyze the calibration standards as described in section 7.1. The maximum percent 

deviation of the triplicate accuracy assessment standard analyses should agree within 10 percent 

of the average value for the triplicate analysis (see Figure 1). The concentration equivalent of the 

accuracy assessment standard must be between 20 and 80 percent of the span. 

7.3 Energy Calibration Standard. Generally, the energy calibration standard will be provided by 

the XRF instrument manufacturer for energy dispersive spectrometers. Energy calibration is 

performed using the manufacturer's recommended calibration standard and involves 

measurement of a specific energy line (based on the metal in the energy calibration standard). 

This is generally an automated procedure used to assure the accuracy of the energy scale. This 

calibration standard may not be applicable to all models of XRF spectrometers (particularly 

wavelength dispersive XRF spectrometers). 

8.0 Sample Collection, Preservation, Transport, and Storage. [Reserved] 

9.0 Quality Control. 

9.1 Energy Calibration. For energy dispersive spectrometers, conduct the energy calibration by 

analyzing the energy calibration standard provided by the manufacturer. The energy calibration 

involves measurement of a specific energy line (based on the metal in the energy calibration 

standard) and then determination of the difference between the measured peak energy value and 

the ideal value. This analysis, if applicable, should be performed daily prior to any sample 

analyses to check the instrument's energy scale. This is generally an automated procedure and 

assures the accuracy of the energy scale. If the energy scale calibration process is not automated, 

follow the manufacturer's procedures to manually adjust the instrument, as necessary. 

9.2 Zero Drift Test. Conduct the zero drift test by analyzing the analyte concentration output by 

the measurement system with the initial calibration value for the zero calibration standard (see 

Figure 2). This analysis should be performed with each set of samples analyzed. 
172 

9.3 Calibration Drift Test. Conduct the calibration drift test by analyzing the analyte 

concentration output by the measurement system with the initial calibration value for the midrange calibration standard (see Figure 2). This analysis should be performed with each set of 

samples analyzed. 

9.4 Analyzer Accuracy Test. Conduct the analyzer accuracy test by analyzing the accuracy 

assessment standard and comparing the value output by the measurement system with the ideal 

value for the accuracy assessment standard (see Figure 2). This analysis should be performed 

with each set of samples analyzed. 

10.0 Calibration and Standardization. 

10.1 Perform the initial calibration and set-up following the instrument manufacturer's 

instructions. These procedures should include, at a minimum, the major steps listed in sections 

10.2 and 10.3. Subsequent calibrations are to be performed when either a quality 

assurance/quality control (QA/QC) limit listed in section 13 is exceeded or when there is a 

change in the excitation conditions, such as a change in the tube, detector, X-ray filters, or signal 

processor. Calibrations are typically valid for 6 months to 1 year. 

10.2 Instrument Calibration. Calibration is performed initially with calibration standards of 

similar matrix and binders, if used, as the samples to be analyzed (see Figure 1). 

10.3 Reference Peak Spectra. Acquisition of reference spectra is required only during the initial 

calibration. As long as no processing methods have changed, these peak shape references remain 

valid. This procedure consists of placing the standards in the instrument and acquiring individual 

elemental spectra that are stored in the method file with each of the analytical conditions. These 

reference spectra are used in the standard deconvolution of the unknown spectra. 

11.0 Analytical Procedure. 

11.1 Sample Preparation. Prepare catalyst samples using the same procedure used to prepare the 

calibration standards. Measure and record the weight of sample used. Measure and record the 

amount of binder, if any, used. Pellets or films must be of sufficient size to cover the analyzer 

sample window. 

11.2 Sample Analyses. Place the prepared catalyst samples into the analyzer. Follow the 

manufacturer's instructions for analyzing the samples. 

11.3 Record and Store Data. Use a digital recorder or personal computer to record and store 

results for each sample. Record any mechanical or software problems encountered during the 

analysis. 

12.0 Data Analysis and Calculations. 

Carry out the following calculations, retaining at least one extra significant figure beyond that of 

the acquired data. Round off figures after final calculation. 
173 

12.1 Drift. Calculate the zero and calibration drift for the tests described in sections 9.2 and 9.3 

(see also Figure 2) as follows: 

100   Span

CurrentAnalyzerCal.Response InitialCal.Response QC Value (Eq. A-1) 

Where: 

CurrentAnalyzerCal.Response = Instrument response for current QC sample analyses; 

InitialCal.Response = Initial instrument response for calibration standard; 

QC Value = QC metric (zero drift or calibration drift), percent of span; 

Span = Span of the monitoring system. 

12.2 Analyzer Accuracy. Calculate the analyzer accuracy error for the tests described in section 

9.4 (see also Figure 2) as follows: 

100   IdealCal.Response

CurrentAnalyzerCal.Response InitialCal.Response Accuracy Value (Eq. A-2) 

Where: 

Accuracy Value = Percent difference of instrument response to the ideal response for the 

accuracy assessment standard; 

CurrentAnalyzerCal.Response = Instrument response for current QC sample analyses; 

IdealCal.Response = Ideal instrument response for the accuracy assessment standard. 

13.0 Method Performance. 

13.1 Analytical Range. The analytical range is determined by the instrument design. For this 

method, a portion of the analytical range is selected by choosing the span of the monitoring 

system. The span of the monitoring system must be selected such that it encompasses the range 

of concentrations anticipated to occur in the catalyst sample. If applicable, the span must be 

selected such that the analyte concentration equivalent to the emission standard is not less than 

30 percent of the span. If the measured analyte concentration exceeds the concentration of the 

high-range calibration standard, the sample analysis is considered invalid. Additionally, if the 

measured analyte concentration is less than the concentration of the low-range calibration 

standard but above the detectable limit, the sample analysis results must be flagged with a 

footnote stating, in effect, that the analyte was detected but that the reported concentration is 

below the lower quantitation limit. 

13.2 Minimum Detectable Limit. The minimum detectable limit depends on the signal-to-noise 

ratio of the measurement system. For a well-designed system, the minimum detectable limit 

should be less than 2 percent of the span. 
174 

13.3 Zero Drift. Less than ±2 percent of the span. 

13.4 Calibration Drift. Less than ±5 percent of the span. 

13.5 Analyzer Accuracy Error. Less than ±10 percent. 

14.0 Pollution Prevention. [Reserved] 

15.0 Waste Management. [Reserved] 

16.0 Alternative Procedures. [Reserved] 

17.0 References. 

1. U.S. Environmental Protection Agency. 1998. Test Methods for Evaluating Solid Waste, 

Physical/Chemical Methods. EPA Publication No. SW–846, Revision 5 (April 1998). Office of 

Solid Waste, Washington, DC. 

18.0 Tables, Diagrams, Flowcharts, and Validation Data. 

Date: 

Analytic Method Used: 

 Zeroa Low-Rangeb Mid-Rangec High-Ranged Accuracy Stde

Sample Run: 

1 

2 

3 

Average 

Maximum Percent Deviation 

a

Average must be less than 0.25 percent of span. 

b

Average must be 1 to 20 percent of span. 

c

Average must be 40 to 60 percent of span. 

d

Average must be 80 to 100 percent of span. 

e

Average must be 20 to 80 percent of span. 

Figure 1. Data Recording Sheet for Analysis of Calibration Samples. 

Source Identification: 

Run Number: 
175 

Test Personnel: 

Span: 

Date: 

 

Initial calibration 

response 

Current analyzer 

calibration response Drift (percent of span) 

Zero Standard 

Mid-range 

Standard 

 

 

Ideal calibration 

response 

Current analyzer 

calibration response 

Accuracy error 

(percent of ideal) 

Accuracy 

Standard 

 

Figure 2. Data Recording Sheet for System Calibration Drift Data.