From: King.Melanie@epamail.epa.gov

Sent: Tuesday, February 08, 2011 1:49 PM

To: Matt Todd

Cc: horowitz.michael@epamail.epa.gov; Wayland.Robertj@epamail.epa.gov; 

Westlin.Peter@epamail.epa.gov

Subject: RICE NESHAP - proposed amendments

Attachments: RICE NESHAP DFRM reg text 2-7-11.pdf

Importance: High

Hi Matt,

We thought it would help with the discussion tomorrow if you could see where 

we are on the changes to the RICE NESHAP in reponse to API et.

al.'s request for a stay of §63.6625(b) and (k). We've taken a look at the 

changes you recommended and considered them in making these revisions. Please 

take a look at this draft rule language and we can discuss during the meeting 

tomorrow. There are a few other corrections that we're making in this 

package, so you'll see those changes reflected here as well. They are as 

follows:

1) §63.6603(a) should have included a reference to Table 1b.

2) The definition for "spark ignition" is missing the word "with" after the 

phrase "or any other type of engine . . . ."

3) The introductory text to Tables 1b and 2b should also have contained a 

reference to §63.6603.

4) Table 5 does not clearly indicate the initial compliance requirements for 

existing non-emergency stationary engines larger than 500 HP complying with 

the concentration limit for CO or formaldehyde.

Currently the requirements are only provided for existing non-emergency 

stationary engines larger than 500 HP complying with the % reduction limit for 

CO or formaldehyde.

5) Item 13.a. in Table 6 should have read “. . . and not using an oxidation 

catalyst or NSCR,”

(See attached file: RICE NESHAP DFRM reg text 2-7-11.pdf)

Melanie King

Energy Strategies Group

Sector Policies and Programs Division

Office of Air Quality Planning and Standards U.S. Environmental Protection 

Agency

Mail Code D243-01

RTP, NC 27711

Phone: (919) 541-2469

Fax: (919) 541-5450

king.melanie@epa.gov
Page 1 of 26 

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For the reasons stated in the preamble, title 40, chapter I, 

part 63 of the Code of Federal Regulations is amended as 

follows: 

PART 63--[AMENDED]

1. The authority citation for part 63 continues to read as 

follows: 

Authority: 42 U.S.C. 7401, et seq. 

Subpart ZZZZ--[amended] 

 2. Section 63.6603 is amended by revising paragraph (a) to 

read as follows: 

§63.6603 What emission limitations and operating limitations 

must I meet if I own or operate an existing stationary RICE 

located at an area source of HAP emissions? 

* * * * * 

(a) If you own or operate an existing stationary RICE 

located at an area source of HAP emissions, you must comply with 

the requirements in Table 2d to this subpart and the operating 

limitations in Table 1b and Table 2b to this subpart that apply 

to you. 

* * * * * 

3. Section 63.6625 is amended by revising paragraph (b) 

and removing paragraph (k) to read as follows: 

§63.6625 What are my monitoring, installation, collection, 

operation, and maintenance requirements?
Page 2 of 26 

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* * * * * 

 (b) If you are required to install a continuous parameter 

monitoring system (CPMS) as specified in Table 5 of this 

subpart, you must install, operate, and maintain each CPMS 

according to the requirements in paragraphs (b)(1) through (5) 

of this section. For an affected source that is complying with 

the emission limitations and operating limitations on [INSERT 

DATE OF PUBLICATION IN THE FEDERAL REGISTER], the requirements 

in paragraph (b) of this section are effective [INSERT DATE 180 

DAYS AFTER PUBLICATION IN THE FEDERAL REGISTER]. 

(1) You must prepare a site-specific monitoring plan that 

addresses the monitoring system design, data collection, and the 

quality assurance and quality control elements outlined in 

paragraphs (b)(1)(i) through (v) of this section and in 

§63.8(d). As specified in §63.8(f)(4), you may request approval 

of monitoring system quality assurance and quality control 

procedures alternative to those specified in paragraphs (b)(1) 

through (5) of this section in your site-specific monitoring 

plan. 

(i) The performance criteria and design specifications for 

the monitoring system equipment, including the sample interface, 

detector signal analyzer, and data acquisition and calculations; 
Page 3 of 26 

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(ii) Sampling interface (e.g., thermocouple) location such 

that the monitoring system will provide representative 

measurements; 

(iii) Equipment performance evaluations, system accuracy 

audits, or other audit procedures; 

(iv) Ongoing operation and maintenance procedures in 

accordance with provisions in §63.8(c)(1) and (c)(3); and 

(v) Ongoing reporting and recordkeeping procedures in 

accordance with provisions in §63.10(c), (e)(1), and (e)(2)(i). 

(2) You must install, operate, and maintain each CPMS in 

continuous operation according to the procedures in your 

approved site-specific monitoring plan. 

(3) The CPMS must collect data at least once every 15 

minutes (see also §63.6635). 

(4) For a CPMS for measuring temperature range, the 

temperature sensor must have a minimum tolerance of 2.8 degrees 

Celsius (5 degrees Fahrenheit) or 1 percent of the measurement 

range, whichever is larger. 

(5) You must conduct the CPMS equipment performance 

evaluation, system accuracy audits, or other audit procedures 

specified in your site-specific monitoring plan at least 

annually. 

(6) You must conduct a performance evaluation of each CPMS 

in accordance with your site-specific monitoring plan. 
Page 4 of 26 

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* * * * * 

 4. Section 63.6635 is amended by revising paragraphs (b) 

and (c) to read as follows: 

§63.6635 How do I monitor and collect data to demonstrate 

continuous compliance?

* * * * * 

 (b) Except for monitor malfunctions, associated repairs, 

required performance evaluations, and required quality assurance 

or control activities, you must monitor continuously at all 

times that the stationary RICE is operating. A monitoring 

malfunction is any sudden, infrequent, not reasonably 

preventable failure of the monitoring to provide valid data. 

Monitoring failures that are caused in part by poor maintenance 

or careless operation are not malfunctions. 

(c) You may not use data recorded during monitoring 

malfunctions, associated repairs, and required quality assurance 

or control activities in data averages and calculations used to 

report emission or operating levels. You must, however, use all 

the valid data collected during all other periods. 

* * * * * 

 5. Section 63.6675 is amended by revising the definition 

of Spark ignition to read as follows: 

* * * * * 
Page 5 of 26 

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 Spark ignition means relating to either: A gasoline-fueled 

engine; or any other type of engine with a spark plug (or other 

sparking device) and with operating characteristics 

significantly similar to the theoretical Otto combustion cycle. 

Spark ignition engines usually use a throttle to regulate intake 

air flow to control power during normal operation. Dual-fuel 

engines in which a liquid fuel (typically diesel fuel) is used 

for CI and gaseous fuel (typically natural gas) is used as the 

primary fuel at an annual average ratio of less than 2 parts 

diesel fuel to 100 parts total fuel on an energy equivalent 

basis are spark ignition engines. 

* * * * * 

 6. Table 1b to Subpart ZZZZ of Part 63 introductory text 

is revised to read as follows: 

* * * * * 

As stated in §§63.6600, 63.6603, 63.6630 and 63.6640, you must 

comply with the following operating limitations for existing, 

new and reconstructed 4SRB stationary RICE >500 HP located at a 

major source of HAP emissions and existing 4SRB stationary RICE 

>500 HP located at an area source of HAP emissions that operate 

more than 24 hours per calendar year: 

* * * * * 

 7. Table 2b to Subpart ZZZZ of Part 63 introductory text 

is revised to read as follows: 
Page 6 of 26 

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* * * * * 

As stated in §§63.6600, 63.6601, 63.6603, 63.6630, and 63.6640, 

you must comply with the following operating limitations for new 

and reconstructed 2SLB and compression ignition stationary RICE 

located at a major source of HAP emissions; new and 

reconstructed 4SLB stationary RICE ≥250 HP located at a major 

source of HAP emissions; existing compression ignition 

stationary RICE >500 HP; and existing 4SLB stationary RICE >500 

HP located at an area source of HAP emissions that operate more 

than 24 hours per calendar year:

* * * * * 

 8. Table 5 to Subpart ZZZZ of Part 63 is revised to read 

as follows: 

Table 5 to Subpart ZZZZ of Part 63. Initial Compliance with 

Emission Limitations and Operating Limitations 

As stated in §§63.6612, 63.6625 and 63.6630, you must initially 

comply with the emission and operating limitations as required 

by the following: 

For each . . . Complying with the 

requirement 

to . . . 

You have 

demonstrated 

initial 

compliance if . . . 
Page 7 of 26 

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1. New or 

reconstructed nonemergency 2SLB 

stationary RICE 

>500 HP located at 

a major source of 

HAP, new or 

reconstructed nonemergency 4SLB 

stationary RICE 

≥250 HP located at 

a major source of 

HAP, non-emergency 

stationary CI RICE 

>500 HP located at 

a major source of 

HAP, existing nonemergency 

stationary CI RICE 

>500 HP located at 

an area source of 

HAP, and existing 

non-emergency 4SLB 

stationary RICE 

>500 HP located at 

an area source of 

HAP that are 

operated more than 

24 hours per 

calendar year. 

a. Reduce CO 

emissions and using 

oxidation catalyst, 

and using a CPMS 

i. The average 

reduction of 

emissions of CO 

determined from the 

initial performance 

test achieves the 

required CO percent 

reduction; and 

ii. You have 

installed a CPMS to 

continuously 

monitor catalyst 

inlet temperature 

according to the 

requirements in 

§63.6625(b); and 

iii. You have 

recorded the 

catalyst pressure 

drop and catalyst 

inlet temperature 

during the initial 

performance test. 
Page 8 of 26 

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2. Non-emergency 

stationary CI RICE 

>500 HP located at 

a major source of 

HAP, existing nonemergency 

stationary CI RICE 

>500 HP located at 

an area source of 

HAP, and existing 

non-emergency 4SLB 

stationary RICE 

>500 HP located at 

an area source of 

HAP that are 

operated more than 

24 hours per 

calendar year. 

a. Limit the 

concentration of 

CO, using oxidation 

catalyst, and using 

a CPMS 

i. The average CO 

concentration 

determined from the 

initial performance 

test is less than 

or equal to the CO 

emission 

limitation; and 

ii. You have 

installed a CPMS to 

continuously 

monitor catalyst 

inlet temperature 

according to the 

requirements in 

§63.6625(b); and 

iii. You have 

recorded the 

catalyst pressure 

drop and catalyst 

inlet temperature 

during the initial 

performance test. 

3. New or 

reconstructed nonemergency 2SLB 

stationary RICE 

>500 HP located at 

a major source of 

HAP, new or 

reconstructed nonemergency 4SLB 

stationary RICE 

≥250 HP located at 

a major source of 

HAP, non-emergency 

stationary CI RICE 

>500 HP located at 

a major source of 

HAP, existing nonemergency 

stationary CI RICE 

>500 HP located at 

an area source of 

HAP, and existing 

a. Reduce CO 

emissions and not 

using oxidation 

catalyst 

i. The average 

reduction of 

emissions of CO 

determined from the 

initial performance 

test achieves the 

required CO percent 

reduction; and 

ii. You have 

installed a CPMS to 

continuously 

monitor operating 

parameters approved 

by the 

Administrator (if 

any) according to 

the requirements in 

§63.6625(b); and 

iii. You have 

recorded the 
Page 9 of 26 

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non-emergency 4SLB 

stationary RICE 

>500 HP located at 

an area source of 

HAP that are 

operated more than 

24 hours per 

calendar year. 

approved operating 

parameters (if any) 

during the initial 

performance test. 

4. Non-emergency 

stationary CI RICE 

>500 HP located at 

a major source of 

HAP, existing nonemergency 

stationary CI RICE 

>500 HP located at 

an area source of 

HAP, and existing 

non-emergency 4SLB 

stationary RICE 

>500 HP located at 

an area source of 

HAP that are 

operated more than 

24 hours per 

calendar year. 

a. Limit the 

concentration of 

CO, and not using 

oxidation catalyst 

i. The average CO 

concentration 

determined from the 

initial performance 

test is less than 

or equal to the CO 

emission 

limitation; and 

ii. You have 

installed a CPMS to 

continuously 

monitor operating 

parameters approved 

by the 

Administrator (if 

any) according to 

the requirements in 

§63.6625(b); and 

iii. You have 

recorded the 

approved operating 

parameters (if any) 

during the initial 

performance test. 
Page 10 of 26 

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5. New or 

reconstructed nonemergency 2SLB 

stationary RICE 

>500 HP located at 

a major source of 

HAP, new or 

reconstructed nonemergency 4SLB 

stationary RICE 

≥250 HP located at 

a major source of 

HAP, non-emergency 

stationary CI RICE 

>500 HP located at 

a major source of 

HAP, existing nonemergency 

stationary CI RICE 

>500 HP located at 

an area source of 

HAP, and existing 

non-emergency 4SLB 

stationary RICE 

>500 HP located at 

an area source of 

HAP that are 

operated more than 

24 hours per 

calendar year. 

a. Reduce CO 

emissions, and 

using a CEMS 

i. You have 

installed a CEMS to 

continuously 

monitor CO and 

either O2 or CO2 at 

both the inlet and 

outlet of the 

oxidation catalyst 

according to the 

requirements in 

§63.6625(a); and 

ii. You have 

conducted a 

performance 

evaluation of your 

CEMS using PS 3 and 

4A of 40 CFR part 

60, appendix B; and 

iii. The average 

reduction of CO 

calculated using 

§63.6620 equals or 

exceeds the 

required percent 

reduction. The 

initial test 

comprises the first 

4-hour period after 

successful 

validation of the 

CEMS. Compliance 

is based on the 

average percent 

reduction achieved 

during the 4-hour 

period. 
Page 11 of 26 

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6. Non-emergency 

stationary CI RICE 

>500 HP located at 

a major source of 

HAP, existing nonemergency 

stationary CI RICE 

>500 HP located at 

an area source of 

HAP, and existing 

non-emergency 4SLB 

stationary RICE 

>500 HP located at 

an area source of 

HAP that are 

operated more than 

24 hours per 

calendar year. 

a. Limit the 

concentration of 

CO, and using a 

CEMS 

i. You have 

installed a CEMS to 

continuously 

monitor CO and 

either O2 or CO2 at 

the outlet of the 

oxidation catalyst 

according to the 

requirements in 

§63.6625(a); and 

ii. You have 

conducted a 

performance 

evaluation of your 

CEMS using PS 3 and 

4A of 40 CFR part 

60, appendix B; and 

iii. The average 

concentration of CO 

calculated using 

§63.6620 is less 

than or equal to 

the CO emission 

limitation. The 

initial test 

comprises the first 

4-hour period after 

successful 

validation of the 

CEMS. Compliance 

is based on the 

average 

concentration 

measured during the 

4-hour period. 

7. Non-emergency 

4SRB stationary 

RICE >500 HP 

located at a major 

source of HAP, and 

existing nonemergency 4SRB 

stationary RICE 

>500 HP located at 

an area source of 

a. Reduce 

formaldehyde 

emissions and using 

NSCR 

i. The average 

reduction of 

emissions of 

formaldehyde 

determined from the 

initial performance 

test is equal to or 

greater than the 

required 

formaldehyde 
Page 12 of 26 

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HAP that are 

operated more than 

24 hours per 

calendar year. 

percent reduction; 

and 

ii. You have 

installed a CPMS to 

continuously 

monitor catalyst 

inlet temperature 

according to the 

requirements in 

§63.6625(b); and 

iii. You have 

recorded the 

catalyst pressure 

drop and catalyst 

inlet temperature 

during the initial 

performance test. 

8. Non-emergency 

4SRB stationary 

RICE >500 HP 

located at a major 

source of HAP, and 

existing nonemergency 4SRB 

stationary RICE 

>500 HP located at 

an area source of 

HAP that are 

operated more than 

24 hours per 

calendar year. 

a. Reduce 

formaldehyde 

emissions and not 

using NSCR 

i. The average 

reduction of 

emissions of 

formaldehyde 

determined from the 

initial performance 

test is equal to or 

greater than the 

required 

formaldehyde 

percent reduction; 

and 

ii. You have 

installed a CPMS to 

continuously 

monitor operating 

parameters approved 

by the 

Administrator (if 

any) according to 

the requirements in 

§63.6625(b); and 

iii. You have 

recorded the 

approved operating 

parameters (if any) 
Page 13 of 26 

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during the initial 

performance test. 

9. Existing nonemergency 4SRB 

stationary RICE 

>500 HP located at 

an area source of 

HAP that are 

operated more than 

24 hours per 

calendar year. 

a. Limit the 

concentration of 

formaldehyde and 

not using NSCR 

i. The average 

formaldehyde 

concentration 

determined from the 

initial performance 

test is less than 

or equal to the 

formaldehyde 

emission 

limitation; and 

and 

ii. You have 

installed a CPMS to 

continuously 

monitor operating 

parameters approved 

by the 

Administrator (if 

any) according to 

the requirements in 

§63.6625(b); and 

iii. You have 

recorded the 

approved operating 

parameters (if any) 

during the initial 

performance test. 

10. New or 

reconstructed nonemergency 

stationary RICE 

>500 HP located at 

a major source of 

HAP, new or 

reconstructed nonemergency 4SLB 

stationary RICE 

250≤HP≤500 located 

at a major source 

of HAP, and 

existing nonemergency 4SRB 

stationary RICE 

a. Limit the 

concentration of 

formaldehyde in the 

stationary RICE 

exhaust and using 

oxidation catalyst 

or NSCR 

i. The average 

formaldehyde 

concentration, 

corrected to 15 

percent O2, dry 

basis, from the 

three test runs is 

less than or equal 

to the formaldehyde 

emission 

limitation; and 

ii. You have 

installed a CPMS to 

continuously 

monitor catalyst 
Page 14 of 26 

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>500 HP. inlet temperature 

according to the 

requirements in 

§63.6625(b); and 

iii. You have 

recorded the 

catalyst pressure 

drop and catalyst 

inlet temperature 

during the initial 

performance test. 

11. New or 

reconstructed nonemergency 

stationary RICE 

>500 HP located at 

a major source of 

HAP, new or 

reconstructed nonemergency 4SLB 

stationary RICE 

250≤HP≤500 located 

at a major source 

of HAP, and 

existing nonemergency 4SRB 

stationary RICE 

>500 HP. 

a. Limit the 

concentration of 

formaldehyde in the 

stationary RICE 

exhaust and not 

using oxidation 

catalyst or NSCR 

i. The average 

formaldehyde 

concentration, 

corrected to 15 

percent O2, dry 

basis, from the 

three test runs is 

less than or equal 

to the formaldehyde 

emission 

limitation; and 

ii. You have 

installed a CPMS to 

continuously 

monitor operating 

parameters approved 

by the 

Administrator (if 

any) according to 

the requirements in 

§63.6625(b); and 

iii. You have 

recorded the 

approved operating 

parameters (if any) 

during the initial 

performance test. 

12. Existing nonemergency 

stationary RICE 

100≤HP≤500 located 

at a major source 

of HAP, and 

a. Reduce CO or 

formaldehyde 

emissions. 

i. The average 

reduction of 

emissions of CO or 

formaldehyde, as 

applicable 

determined from the 
Page 15 of 26 

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existing nonemergency 

stationary CI RICE 

300<HP≤500 located 

at an area source 

of HAP. 

initial performance 

test is equal to or 

greater than the 

required CO or 

formaldehyde, as 

applicable, percent 

reduction. 

13. Existing nonemergency 

stationary RICE 

100≤HP≤500 located 

at a major source 

of HAP, and 

existing nonemergency 

stationary CI RICE 

300<HP≤500 located 

at an area source 

of HAP. 

a. Limit the 

concentration of 

formaldehyde or CO

in the stationary 

RICE exhaust. 

i. The average 

formaldehyde or CO 

concentration, as 

applicable, 

corrected to 15 

percent O2, dry 

basis, from the 

three test runs is 

less than or equal 

to the formaldehyde 

or CO emission 

limitation, as 

applicable. 

 9. Table 6 to Subpart ZZZZ of Part 63 is revised to read 

as follows: 

Table 6 to Subpart ZZZZ of Part 63. Continuous Compliance with 

Emission Limitations, Operating Limitations, Work Practices, and 

Management Practices 

As stated in §63.6640, you must continuously comply with the 

emissions and operating limitations and work or management 

practices as required by the following: 

For each . . . Complying with the 

requirement to . . 

. 

You must 

demonstrate 

continuous 

compliance by 

. . . 

1. New or 

reconstructed nonemergency 2SLB 

stationary RICE 

>500 HP located at 

a major source of 

a. Reduce CO 

emissions and using 

an oxidation 

catalyst, and using 

a CPMS 

i. Conducting 

semiannual 

performance tests 

for CO to 

demonstrate that 

the required CO 
Page 16 of 26 

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HAP, new or 

reconstructed nonemergency 4SLB 

stationary RICE 

≥250 HP located at 

a major source of 

HAP, and new or 

reconstructed nonemergency CI 

stationary RICE 

>500 HP located at 

a major source of 

HAP. 

percent reduction 

is achieveda

; and 

ii. Collecting the 

catalyst inlet 

temperature data 

according to 

§63.6625(b); and 

iii. Reducing these 

data to 4-hour 

rolling averages; 

and 

iv. Maintaining the 

4-hour rolling 

averages within the 

operating 

limitations for the 

catalyst inlet 

temperature; and 

v. Measuring the 

pressure drop 

across the catalyst 

once per month and 

demonstrating that 

the pressure drop 

across the catalyst 

is within the 

operating 

limitation 

established during 

the performance 

test. 

2. New or 

reconstructed nonemergency 2SLB 

stationary RICE 

>500 HP located at 

a major source of 

HAP, new or 

reconstructed nonemergency 4SLB 

stationary RICE 

≥250 HP located at 

a major source of 

a. Reduce CO 

emissions and not 

using an oxidation 

catalyst, and using 

a CPMS 

i. Conducting 

semiannual 

performance tests 

for CO to 

demonstrate that 

the required CO 

percent reduction 

is achieveda; and 

ii. Collecting the 

approved operating 

parameter (if any) 
Page 17 of 26 

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HAP, and new or 

reconstructed nonemergency CI 

stationary RICE 

>500 HP located at 

a major source of 

HAP. 

data according to 

§63.6625(b); and 

iii. Reducing these 

data to 4-hour 

rolling averages; 

and 

iv. Maintaining the 

4-hour rolling 

averages within the 

operating 

limitations for the 

operating 

parameters 

established during 

the performance 

test. 

3. New or 

reconstructed nonemergency 2SLB 

stationary RICE 

>500 HP located at 

a major source of 

HAP, new or 

reconstructed nonemergency 4SLB 

stationary RICE 

≥250 HP located at 

a major source of 

HAP, new or 

reconstructed nonemergency 

stationary CI RICE 

>500 HP located at 

a major source of 

HAP, existing nonemergency 

stationary CI RICE 

>500 HP, existing 

non-emergency 4SLB 

stationary RICE 

>500 HP located at 

an area source of 

HAP that are 

operated more than 

24 hours per 

a. Reduce CO 

emissions or limit 

the concentration 

of CO in the 

stationary RICE 

exhaust, and using 

a CEMS 

i. Collecting the 

monitoring data 

according to 

§63.6625(a), 

reducing the 

measurements to 1-

hour averages, 

calculating the 

percent reduction 

or concentration of 

CO emissions 

according to 

§63.6620; and 

ii. Demonstrating 

that the catalyst 

achieves the 

required percent 

reduction of CO 

emissions over the 

4-hour averaging 

period, or that the 

emission remain at 

or below the CO 

concentration 

limit; and 

iii. Conducting an 

annual RATA of your 
Page 18 of 26 

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calendar year. CEMS using PS 3 and 

4A of 40 CFR part 

60, appendix B, as 

well as daily and 

periodic data 

quality checks in 

accordance with 40 

CFR part 60, 

appendix F, 

procedure 1. 

4. Non-emergency 

4SRB stationary 

RICE >500 HP 

located at a major 

source of HAP. 

a. Reduce 

formaldehyde 

emissions and using 

NSCR 

i. Collecting the 

catalyst inlet 

temperature data 

according to 

§63.6625(b); and 

ii. reducing these 

data to 4-hour 

rolling averages; 

and 

iii. Maintaining 

the 4-hour rolling 

averages within the 

operating 

limitations for the 

catalyst inlet 

temperature; and 

iv. Measuring the 

pressure drop 

across the catalyst 

once per month and 

demonstrating that 

the pressure drop 

across the catalyst 

is within the 

operating 

limitation 

established during 

the performance 

test. 

5. Non-emergency 

4SRB stationary 

RICE >500 HP 

located at a major 

source of HAP. 

a. Reduce 

formaldehyde 

emissions and not 

using NSCR 

i. Collecting the 

approved operating 

parameter (if any) 

data according to 

§63.6625(b); and 
Page 19 of 26 

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ii. Reducing these 

data to 4-hour 

rolling averages; 

and 

iii. Maintaining 

the 4-hour rolling 

averages within the 

operating 

limitations for the 

operating 

parameters 

established during 

the performance 

test. 

6. Non-emergency 

4SRB stationary 

RICE with a brake 

HP ≥5,000 located 

at a major source 

of HAP. 

a. Reduce 

formaldehyde 

emissions 

Conducting 

semiannual 

performance tests 

for formaldehyde to 

demonstrate that 

the required 

formaldehyde 

percent reduction 

is achieveda

. 

7. New or 

reconstructed nonemergency 

stationary RICE 

>500 HP located at 

a major source of 

HAP and new or 

reconstructed nonemergency 4SLB 

stationary RICE 

250≤HP≤500 located 

at a major source 

of HAP. 

a. Limit the 

concentration of 

formaldehyde in the 

stationary RICE 

exhaust and using 

oxidation catalyst 

or NSCR 

i. Conducting 

semiannual 

performance tests 

for formaldehyde to 

demonstrate that 

your emissions 

remain at or below 

the formaldehyde 

concentration 

limita

; and 

ii. Collecting the 

catalyst inlet 

temperature data 

according to 

§63.6625(b); and 

iii. Reducing these 

data to 4-hour 

rolling averages; 

and 
Page 20 of 26 

DRAFT – DO NOT CITE OR QUOTE 

iv. Maintaining the 

4-hour rolling 

averages within the 

operating 

limitations for the 

catalyst inlet 

temperature; and 

v. Measuring the 

pressure drop 

across the catalyst 

once per month and 

demonstrating that 

the pressure drop 

across the catalyst 

is within the 

operating 

limitation 

established during 

the performance 

test. 

8. New or 

reconstructed nonemergency 

stationary RICE 

>500 HP located at 

a major source of 

HAP and new or 

reconstructed nonemergency 4SLB 

stationary RICE 

250≤HP≤500 located 

at a major source 

of HAP. 

a. Limit the 

concentration of 

formaldehyde in the 

stationary RICE 

exhaust and not 

using oxidation 

catalyst or NSCR 

i. Conducting 

semiannual 

performance tests 

for formaldehyde to 

demonstrate that 

your emissions 

remain at or below 

the formaldehyde 

concentration 

limita

; and 

ii. Collecting the 

approved operating 

parameter (if any) 

data according to 

§63.6625(b); and 

iii. Reducing these 

data to 4-hour 

rolling averages; 

and 

iv. Maintaining the 

4-hour rolling 

averages within the 

operating 
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DRAFT – DO NOT CITE OR QUOTE 

limitations for the 

operating 

parameters 

established during 

the performance 

test. 

9. Existing 

emergency and 

black start 

stationary RICE 

≤500 HP located at 

a major source of 

HAP, existing nonemergency 

stationary RICE 

<100 HP located at 

a major source of 

HAP, existing 

emergency and 

black start 

stationary RICE 

located at an area 

source of HAP, 

existing nonemergency 

stationary CI RICE 

≤300 HP located at 

an area source of 

HAP, existing nonemergency 2SLB 

stationary RICE 

located at an area 

source of HAP, 

existing nonemergency landfill 

or digester gas 

stationary SI RICE 

located at an area 

source of HAP, 

existing nonemergency 4SLB and 

4SRB stationary 

RICE ≤500 HP 

located at an area 

source of HAP, 

existing nonemergency 4SLB and 

a. Work or 

Management 

practices. 

i. Operating and 

maintaining the 

stationary RICE 

according to the 

manufacturer’s 

emission-related 

operation and 

maintenance 

instructions; 

or 

ii. Develop and 

follow your own 

maintenance plan 

which must provide 

to the extent 

practicable for the 

maintenance and 

operation of the 

engine in a manner 

consistent with 

good air pollution 

control practice 

for minimizing 

emissions. 
Page 22 of 26 

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4SRB stationary 

RICE >500 HP 

located at an area 

source of HAP that 

operate 24 hours 

or less per 

calendar year. 

10. Existing 

stationary CI RICE 

>500 HP that are 

not limited use 

stationary RICE, 

and existing 4SLB 

and 4SRB 

stationary RICE 

>500 HP located at 

an area source of 

HAP that operate 

more than 24 hours 

per calendar year 

and are not 

limited use 

stationary RICE. 

a. Reduce CO or 

formaldehyde 

emissions, or limit 

the concentration 

of formaldehyde or 

CO in the 

stationary RICE 

exhaust, and using 

oxidation catalyst 

or NSCR 

i. Conducting 

performance tests 

every 8,760 hours 

or 3 years, 

whichever comes 

first, for CO or 

formaldehyde, as 

appropriate, to 

demonstrate that 

the required CO or 

formaldehyde, as 

appropriate, 

percent reduction 

is achieved or that 

your emissions 

remain at or below 

the CO or 

formaldehyde 

concentration 

limit; and 

ii. Collecting the 

catalyst inlet 

temperature data 

according to 

§63.6625(b); and 

iii. Reducing these 

data to 4-hour 

rolling averages; 

and 

iv. Maintaining the 

4-hour rolling 

averages within the 

operating 

limitations for the 

catalyst inlet 

temperature; and 
Page 23 of 26 

DRAFT – DO NOT CITE OR QUOTE 

v. Measuring the 

pressure drop 

across the catalyst 

once per month and 

demonstrating that 

the pressure drop 

across the catalyst 

is within the 

operating 

limitation 

established during 

the performance 

test. 

11. Existing 

stationary CI RICE 

>500 HP that are 

not limited use 

stationary RICE, 

and existing 4SLB 

and 4SRB 

stationary RICE 

>500 HP located at 

an area source of 

HAP that that 

operate more than 

24 hours per 

calendar year and 

are not limited 

use stationary 

RICE. 

a. Reduce CO or 

formaldehyde 

emissions, or limit 

the concentration 

of formaldehyde or 

CO in the 

stationary RICE 

exhaust, and not 

using oxidation 

catalyst or NSCR 

i. Conducting 

performance tests 

every 8,760 hours 

or 3 years, 

whichever comes 

first, for CO or 

formaldehyde, as 

appropriate, to 

demonstrate that 

the required CO or 

formaldehyde, as 

appropriate, 

percent reduction 

is achieved or that 

your emissions 

remain at or below 

the CO or 

formaldehyde 

concentration 

limit; and 

ii. Collecting the 

approved operating 

parameter (if any) 

data according to 

§63.6625(b); and 

iii. Reducing these 

data to 4-hour 

rolling averages; 

and 

iv. Maintaining the 

4-hour rolling 
Page 24 of 26 

DRAFT – DO NOT CITE OR QUOTE 

averages within the 

operating 

limitations for the 

operating 

parameters 

established during 

the performance 

test. 

12. Existing 

limited use CI 

stationary RICE 

>500 HP and 

existing limited 

use 4SLB and 4SRB 

stationary RICE 

>500 HP located at 

an area source of 

HAP that operate 

more than 24 hours 

per calendar year. 

a. Reduce CO or 

formaldehyde 

emissions or limit 

the concentration 

of formaldehyde or 

CO in the 

stationary RICE 

exhaust, and using 

an oxidation 

catalyst or NSCR 

i. Conducting 

performance tests 

every 8,760 hours 

or 5 years, 

whichever comes 

first, for CO or 

formaldehyde, as 

appropriate, to 

demonstrate that 

the required CO or 

formaldehyde, as 

appropriate, 

percent reduction 

is achieved or 

that your emissions 

remain at or below 

the CO or 

formaldehyde 

concentration 

limit; and 

ii. Collecting the 

catalyst inlet 

temperature data 

according to 

§63.6625(b); and 

iii. Reducing these 

data to 4-hour 

rolling averages; 

and 

iv. Maintaining the 

4-hour rolling 

averages within the 

operating 

limitations for the 

catalyst inlet 

temperature; and 
Page 25 of 26 

DRAFT – DO NOT CITE OR QUOTE 

v. Measuring the 

pressure drop 

across the catalyst 

once per month and 

demonstrating that 

the pressure drop 

across the catalyst 

is within the 

operating 

limitation 

established during 

the performance 

test. 

13. Existing 

limited use CI 

stationary RICE 

>500 HP and 

existing limited 

use 4SLB and 4SRB 

stationary RICE 

>500 HP located at 

an area source of 

HAP that operate 

more than 24 hours 

per calendar year. 

a. Reduce CO or 

formaldehyde 

emissions or limit 

the concentration 

of formaldehyde or 

CO in the 

stationary RICE 

exhaust, and not 

using an oxidation 

catalyst or NSCR 

i. Conducting 

performance tests 

every 8,760 hours 

or 5 years, 

whichever comes 

first, for CO or 

formaldehyde, as 

appropriate, to 

demonstrate that 

the required CO or 

formaldehyde, as 

appropriate, 

percent reduction 

is achieved or 

that your emissions 

remain at or below 

the CO or 

formaldehyde 

concentration 

limit; and 

ii. Collecting the 

approved operating 

parameter (if any) 

data according to 

§63.6625(b); and 

iii. Reducing these 

data to 4-hour 

rolling averages; 

and 

iv. Maintaining the 
Page 26 of 26 

DRAFT – DO NOT CITE OR QUOTE 

4-hour rolling 

averages within the 

operating 

limitations for the 

operating 

parameters 

established during 

the performance 

test. a

After you have demonstrated compliance for two consecutive 

tests, you may reduce the frequency of subsequent performance 

tests to annually. If the results of any subsequent annual 

performance test indicate the stationary RICE is not in 

compliance with the CO or formaldehyde emission limitation, or 

you deviate from any of your operating limitations, you must 

resume semiannual performance tests.