E.O. 12866_Brick & Clay 2060-AP69 Final_20150824 

6560-50-P 

ENVIRONMENTAL PROTECTION AGENCY 

40 CFR Part 63 

[EPA-HQ-OAR-2013-0290 and EPA-HQ-OAR-2013-0291; FRL-9933-13-OAR] 

RIN 2060-AP69 

NESHAP for Brick and Structural Clay Products Manufacturing; and 

NESHAP for Clay Ceramics Manufacturing 

AGENCY: Environmental Protection Agency (EPA). 

ACTION: Final rule. 

SUMMARY: The Environmental Protection Agency (EPA) is finalizing 

national emission standards for hazardous air pollutants 

(NESHAP) for Brick and Structural Clay Products (BSCP) 

Manufacturing and NESHAP for Clay Ceramics Manufacturing. All 

major sources in these categories must meet maximum achievable 

control technology (MACT) standards for mercury (Hg), nonmercury (non-Hg) metal hazardous air pollutants (HAP) (or 

particulate matter (PM) surrogate) and dioxins/furans (Clay 

Ceramics only); health-based standards for acid gas HAP; and 

work practice standards, where applicable. The final rule, which 

has been informed by input from industry and other stakeholders 

including small businesses, protects air quality and promotes 
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public health by reducing emissions of HAP listed in section 112 

of the Clean Air Act (CAA). 

DATES: This action is effective on [insert date 60 days from 

date of publication in the Federal Register]. The incorporation 

by reference of certain publications listed in this rule is 

approved by the Director of the Federal Register as of [insert 

date 60 days from date of publication in the Federal Register]. 

ADDRESSES: The EPA has established dockets for this rulemaking 

under Docket ID No. EPA-HQ-OAR-2013-0291 for Brick and 

Structural Clay Products Manufacturing and Docket ID No. EPA-HQOAR-2013-0290 for Clay Ceramics Manufacturing. All documents in 

the dockets are listed in the regulations.gov index. Although 

listed in the index, some information is not publicly available, 

e.g., confidential business information (CBI) or other 

information whose disclosure is restricted by statute. Certain 

other material, such as copyrighted material, is not placed on 

the Internet and will be publicly available only in hard copy. 

Publicly available docket materials are available either 

electronically in regulations.gov or in hard copy at the EPA 

Docket Center, EPA WJC West Building, Room 3334, 1301 

Constitution Ave., NW, Washington, DC. The Public Reading Room 

is open from 8:30 a.m. to 4:30 p.m., Monday through Friday, 

excluding legal holidays. The telephone number for the Public 
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Reading Room is (202) 566-1744 and the telephone number for the 

EPA Docket Center is (202) 566-1742. 

FOR FURTHER INFORMATION CONTACT: For questions about the final 

rule for Brick and Structural Clay Products Manufacturing and 

Clay Ceramics Manufacturing, contact Ms. Sharon Nizich, Minerals 

and Manufacturing Group, Sector Policies and Program Division 

(D243-04), Office of Air Quality Planning and Standards, U.S. 

Environmental Protection Agency, Research Triangle Park, North 

Carolina 27711; Telephone number: (919) 541-2825; Fax number: 

(919) 541-5450; Email address: nizich.sharon@epa.gov. 

SUPPLEMENTARY INFORMATION: 

Preamble Acronyms and Abbreviations. This preamble includes 

several acronyms and terms used to describe industrial 

processes, data inventories and risk modeling. While this list 

may not be exhaustive, to ease the reading of this preamble and 

for reference purposes, the EPA defines the following terms and 

acronyms here: 

ACI activated carbon injection 

AEGL Acute Exposure Guideline Level 

AERMOD air dispersion model used by the HEM–3 model 

APCD air pollution control device 

ASOS Automated Surface Observing Systems 

ATSDR Agency for Toxic Substances and Disease Registry 

BIA Brick Industry Association 

BLD bag leak detection 

BSCP Brick and Structural Clay Products 

CAA Clean Air Act 

CalEPA California Environmental Protection Agency 

CASRN Chemical Abstract Services Registry Number 
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CBI Confidential Business Information 

CDX Central Data Exchange 

CEDRI Compliance and Emissions Data Reporting Interface 

CFR Code of Federal Regulations 

Cl2 chlorine 

CO carbon monoxide 

CO2 carbon dioxide 

CPMS continuous parameter monitoring system 

CRA Congressional Review Act 

DHHS Department of Health and Human Services 

DIFF dry lime injection fabric filter 

DLA dry limestone adsorber 

DLS/FF dry lime scrubber/fabric filter 

DOD Department of Defense 

ECHO Enforcement and Compliance History Online 

EPA Environmental Protection Agency 

ERPG Emergency Response Planning Guideline 

ERT Electronic Reporting Tool 

°F degrees Fahrenheit 

FAA Federal Aviation Administration 

FF fabric filter 

FQPA Food Quality Protection Act 

FRFA final regulatory flexibility analysis 

FTIR Fourier transform infrared 

gr/dscf grains per dry standard cubic foot 

HAP hazardous air pollutant 

HBEL health-based emission limit 

HCl hydrogen chloride 

HEM-3 Human Exposure Model (Community and Sector version 

1.3.1) 

HF hydrogen fluoride 

Hg mercury 

HI hazard index 

HQ hazard quotient 

IARC International Agency for Research on Cancer 

ICR information collection request 

IRFA initial regulatory flexibility analysis 

IRIS Integrated Risk Information System 

lb/hr pounds per hour 

lb/ton pounds per ton 

LML lowest measured level 

LOAEL lowest observed adverse effects level 

LOEL lowest observed effects level 

MACT maximum achievable control technology 

mg/m3 milligrams per cubic meter 

μg/dscm micrograms per dry standard cubic meter 
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μg/m3 micrograms per cubic meter 

MMBtu/yr million British thermal units per year 

MRL Minimal Risk Level 

NAAQS National Ambient Air Quality Standards 

NAICS North American Industry Classification System 

NAS National Academy of Sciences 

NATA National Air Toxics Assessment 

NEI National Emissions Inventory 

NESHAP national emissions standards for hazardous air 

pollutants 

ng/kg nanograms per kilogram 

NIOSH National Institute for Occupational Safety and Health 

No. number 

NO2 nitrogen dioxide 

NOAEL no observed adverse effect level 

Non-Hg non-mercury 

NOX nitrogen oxides 

NTTAA National Technology Transfer and Advancement Act 

NWS National Weather Service 

O2 oxygen 

OECD Organisation for Economic Co-operation and 

Development 

OEHHA Office of Environmental Health Hazard Assessment 

OM&M operation, maintenance and monitoring 

OMB Office of Management and Budget 

%R percent recovery 

PM particulate matter 

PM2.5 particulate matter with particles less than 2.5 

micrometers in diameter 

ppm parts per million 

PRA Paperwork Reduction Act 

REL reference exposure level 

RFA Regulatory Flexibility Act 

RfC reference concentration 

RfD reference dose 

RIA Regulatory Impact Analysis 

RTR residual risk and technology review 

SAB Science Advisory Board 

SBA Small Business Administration 

SBAR Small Business Advocacy Review 

SBE Standard Brick Equivalent 

SBREFA Small Business Regulatory Enforcement Fairness Act 

SO2 sulfur dioxide 

SSM startup, shutdown and malfunction 

TEQ 2,3,7,8-tetrachlorodibenzo-p-dioxin toxic equivalents 

TOSHI target-organ-specific hazard index 
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tph tons per hour 

tpy tons per year 

TTN Technology Transfer Network 

UMRA Unfunded Mandates Reform Act 

UPL Upper Prediction Limit 

VE visible emissions 

yr year 

Background Information Documents. On December 18, 2014, the EPA 

proposed NESHAP for Brick and Structural Clay Products 

Manufacturing and NESHAP for Clay Ceramics Manufacturing (79 FR 

75622). In this action, we are finalizing the rules. Documents 

summarizing the public comments on the proposal and presenting 

the EPA responses to those comments are available in Docket ID 

No. EPA-HQ-OAR-2013–0291 for Brick and Structural Clay Products 

Manufacturing and Docket ID No. EPA–HQ–OAR–2013–0290 for Clay 

Ceramics Manufacturing. 

Organization of This Document. The information in this preamble 

is organized as follows: 

I. General Information 

A. Executive Summary 

B. Does this action apply to me? 

C. Where can I get a copy of this document and other related 

information? 

D. Judicial Review 

II. Background Information 

A. What is the statutory authority for the final rule? 

B. What actions preceded this final rule? 

C. What are the health effects of pollutants emitted from 

the Brick and Structural Clay Products and Clay Ceramics 

Manufacturing source categories? 

III. Summary of the Final Rule 

A. What are the final rule requirements for BSCP 

Manufacturing? 

B. What are the final rule requirements for Clay Ceramics 
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Manufacturing? 

C. What are the requirements during periods of startup, 

shutdown, and malfunction? 

D. What are the effective and compliance dates of the 

standards? 

E. What are the requirements for submission of performance 

test data to the EPA? 

F. What materials are being incorporated by reference under 

1 CFR part 51? 

IV. Summary of Significant Changes Following Proposal and 

Rationale 

A. What are the significant changes since proposal for the 

BSCP Manufacturing NESHAP? 

B. What are the significant changes since proposal for the 

Clay Ceramics Manufacturing NESHAP? 

V. Summary of Significant Comments and Responses 

A. Health-Based Standards 

B. BSCP Manufacturing NESHAP 

C. Clay Ceramics Manufacturing NESHAP 

VI. Summary of the Cost, Environmental, Energy and Economic 

Impacts 

A. What are the cost and emission reduction impacts? 

B. What are the secondary impacts? 

C. What are the economic impacts? 

D. What are the benefits? 

VII. Statutory and Executive Order Reviews 

A. Executive Order 12866: Regulatory Planning and Review and 

Executive Order 13563: Improving Regulation and 

Regulatory Review 

B. Paperwork Reduction Act (PRA) 

C. Regulatory Flexibility Act (RFA) 

D. Unfunded Mandates Reform Act (UMRA) 

E. Executive Order 13132: Federalism 

F. Executive Order 13175: Consultation and Coordination with 

Indian Tribal Governments 

G. Executive Order 13045: Protection of Children from 

Environmental Health Risks and Safety Risks 

H. Executive Order 13211: Actions Concerning Regulations 

That Significantly Affect Energy Supply, Distribution or 

Use 

I. National Technology Transfer and Advancement Act (NTTAA) 

J. Executive Order 12898: Federal Actions to Address 

Environmental Justice in Minority Populations and LowIncome Populations 

K. Congressional Review Act (CRA) 
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I. General Information 

A. Executive Summary 

1. Purpose of the Regulatory Action 

Section 112(d) of the CAA requires the EPA to set emissions 

standards for HAP emitted by major stationary sources based on 

the performance of the MACT. We issued the NESHAP for BSCP and 

the NESHAP for Clay Ceramics Manufacturing on May 16, 2003. The 

two NESHAP were vacated and remanded by the United States Court 

of Appeals for the District of Columbia Circuit on March 13, 

2007. To address the vacatur and remand of the original NESHAP, 

we are issuing new standards for BSCP manufacturing and clay 

ceramics manufacturing. 

2. Summary of the Major Provisions 

a. BSCP Manufacturing NESHAP 

The EPA is finalizing MACT emission limits for non-Hg HAP 

metals (or PM surrogate) and Hg, and a health-based emission 

limit (HBEL) for acid gases (hydrogen fluoride (HF), hydrogen 

chloride (HCl) and chlorine (Cl2)), for BSCP tunnel kilns. In 

addition, the EPA is finalizing work practice standards for 

periodic kilns, dioxins/furans from tunnel kilns, and periods of 

startup and shutdown for tunnel kilns. To demonstrate compliance 

with the emission limits, the EPA is requiring initial and 

repeat 5-year performance testing for the regulated pollutants, 
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parameter monitoring, and daily visible emissions (VE) checks. 

Owners/operators whose BSCP tunnel kilns are equipped with a 

fabric filter (FF) (e.g., dry lime injection fabric filter 

(DIFF), dry lime scrubber/fabric filter (DLS/FF)) have the 

option of demonstrating compliance using a bag leak detection 

(BLD) system instead of daily VE checks. 

b. Clay Ceramics Manufacturing NESHAP 

The EPA is finalizing MACT emission limits for Hg, PM 

(surrogate for non-Hg HAP metals), and dioxins/furans and HBEL 

for acid gases (HF and HCl) for sanitaryware tunnel kilns and 

ceramic tile roller kilns. In addition, the EPA is finalizing 

MACT emission limits for dioxins/furans for ceramic tile spray 

dryers and floor tile press dryers, MACT emission limits for Hg 

and PM (surrogate for non-Hg HAP metals) for ceramic tile glaze 

lines and MACT emission limits for PM (surrogate for non-Hg HAP 

metals) for sanitaryware glaze spray booths. The EPA is also 

finalizing work practice standards for shuttle kilns and periods 

of startup and shutdown. To demonstrate compliance with the 

emission limits, the EPA is requiring initial and repeat 5-year 

performance testing for the regulated pollutants, parameter 

monitoring, and daily VE checks. Owners/operators whose affected 

sources are equipped with a FF (e.g., DIFF, DLS/FF) have the 
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option of demonstrating compliance using a BLD system instead of 

daily VE checks. 

3. Costs and Benefits 

Table 1 of this preamble summarizes the costs and benefits 

of this action for 40 CFR part 63, subpart JJJJJ (BSCP 

Manufacturing NESHAP), while Table 2 of this preamble summarizes 

the costs of this action for 40 CFR part 63, subpart KKKKK (Clay 

Ceramics Manufacturing NESHAP). See section VI of this preamble 

for further discussion of the costs and benefits for the BSCP 

Manufacturing NESHAP and the costs for the Clay Ceramics 

Manufacturing NESHAP. See section VII.B of this preamble for 

discussion of the recordkeeping and reporting costs. 

TABLE 1. SUMMARY OF THE COSTS AND BENEFITS OF 40 CFR PART 63, SUBPART JJJJJ

(MILLIONS OF 2011 DOLLARS) 

Requirement 

Capital 

cost Annual cost 

Net benefit 

(7 percent 

discount)a

Emission controls $62.3 $23.7 $48 to 150 

Emissions testing $2.26 $0.552 

Monitoring -- $0.352 

a Net benefit is the annual cost subtracted from the total monetized benefits 

(at a 7 percent discount rate). For more information, see section 7 of 

“Regulatory Impact Analysis: Final Brick and Structural Clay Products NESHAP” 

in Docket ID No. EPA-HQ-OAR-2013–0291. 

TABLE 2. SUMMARY OF THE COSTS OF 40 CFR PART 63, SUBPART KKKKK (MILLIONS OF 

2011 DOLLARS) 

Requirement Capital cost Annual cost 

Emission controls $0 $0 

Emissions testing $0.267 $0.0655 
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Requirement Capital cost Annual cost 

Monitoring -- $0.0269 

B. Does this action apply to me? 

The regulated categories and entities potentially affected 

by this action are shown in Table 3 of this preamble: 

TABLE 3. NESHAP AND INDUSTRIAL SOURCE CATEGORIES AFFECTED BY THIS ACTION

Category 

NAICS 

codea,b

Examples of potentially 

regulated entities 

Industry.... 327120 Brick, structural clay, and 

extruded tile manufacturing 

facilities (BSCP Manufacturing 

NESHAP); and ceramic wall and 

floor tile manufacturing 

facilities (Clay Ceramics 

Manufacturing NESHAP). 

327110 Vitreous plumbing fixtures 

(sanitaryware) manufacturing 

facilities (Clay Ceramics 

Manufacturing NESHAP). 

Federal government... ... Not affected. 

State/local/tribal 

government... 

... Not affected. 

a North American Industry Classification System 

b Refractories manufacturing is not included in the source 

categories affected by this action. 

This table is not intended to be exhaustive, but rather 

provides a guide for readers regarding entities likely to be 

regulated by this action. To determine whether your facility, 

company, business, organization, etc., is regulated by this 

action, you should examine the applicability criteria in 40 CFR 
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63.8385 of subpart JJJJJ (BSCP Manufacturing NESHAP) or 40 CFR 

63.8535 of subpart KKKKK (Clay Ceramics Manufacturing NESHAP). 

If you have any questions regarding the applicability of this 

action to a particular entity, contact either the delegated 

authority for the entity or your EPA regional representative as 

listed in 40 CFR 63.13 of subpart A (General Provisions). 

C. Where can I get a copy of this document and other related 

information? 

In addition to being available in the docket, an electronic 

copy of this action is available on the Internet through the 

EPA’s Technology Transfer Network (TTN) Web site, a forum for 

information and technology exchange in various areas of air 

pollution control. Following signature by the EPA Administrator, 

the EPA will post a copy of this action at 

http://www.epa.gov/ttn/atw/brick/brickpg.html. Following 

publication in the Federal Register, the EPA will post the 

Federal Register version of the final rule and key technical 

documents at this same Web site. 

D. Judicial Review 

Under section 307(b)(1) of the CAA, judicial review of this 

final action is available only by filing a petition for review 

in the United States Court of Appeals for the District of 

Columbia Circuit by [insert date 60 days from date of 
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publication in the Federal Register]. Under section 307(b)(2) of 

the CAA, the requirements established by these final rules may 

not be challenged separately in any civil or criminal 

proceedings brought by the EPA to enforce the requirements. 

Section 307(d)(7)(B) of the CAA further provides that 

“[o]nly an objection to a rule or procedure which was raised 

with reasonable specificity during the period for public comment 

(including any public hearing) may be raised during judicial 

review.” This section also provides a mechanism for us to 

convene a proceeding for reconsideration, “[i]f the person 

raising an objection can demonstrate to the EPA that it was 

impracticable to raise such objection within [the period for 

public comment] or if the grounds for such objection arose after 

the period for public comment (but within the time specified for 

judicial review) and if such objection is of central relevance 

to the outcome of the rule.” Any person seeking to make such a 

demonstration to us should submit a Petition for Reconsideration 

to the Office of the Administrator, U.S. EPA, Room 3000, William 

Jefferson Clinton Building, 1200 Pennsylvania Ave., NW, 

Washington, DC 20460, with a copy to both the person(s) listed 

in the preceding FOR FURTHER INFORMATION CONTACT section and the 

Associate General Counsel for the Air and Radiation Law Office, 
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Office of General Counsel (Mail Code 2344A), U.S. EPA, 1200 

Pennsylvania Ave., NW, Washington, DC 20460. 

II. Background Information 

A. What is the statutory authority for the final rule? 

Section 112(d) of the CAA requires the EPA to set emissions 

standards for HAP emitted by major stationary sources based on 

the performance of the MACT. The MACT standards for existing 

sources must be at least as stringent as the average emissions 

limitation achieved by the best performing 12 percent of 

existing sources (for which the Administrator has emissions 

information) or the best performing five sources for source 

categories with less than 30 sources (CAA section 112(d)(3)(A) 

and (B)). This level of minimum stringency is called the MACT 

floor. For new sources, MACT standards must be at least as 

stringent as the control level achieved in practice by the best 

controlled similar source (CAA section 112(d)(3)). The EPA also 

must consider more stringent “beyond-the-floor” control options. 

When considering beyond-the-floor options, the EPA must not only 

consider the maximum degree of reduction in emissions of HAP, 

but must also take into account costs, energy and nonair 

environmental impacts when doing so. 
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B. What actions preceded this final rule? 

Pursuant to CAA section 112(c)(5), the EPA was originally 

required to promulgate standards for the BSCP Manufacturing and 

Clay Ceramics Manufacturing source categories by November 2000. 

The agency initially promulgated standards for these categories 

in 2003. See 68 FR 26690 (May 16, 2003). Those standards were 

challenged and subsequently vacated by the United States Court 

of Appeals for the District of Columbia Circuit in 2007. See 

Sierra Club v. EPA, 479 F.3d 875, 876 (D.C. Cir. 2007). In 2008, 

Sierra Club filed suit in the United States Court of Appeals for 

the District of Columbia Circuit under CAA section 304(a)(2), 

alleging that the EPA had a continuing mandatory duty to 

promulgate standards for these categories under CAA section 112 

based on the 2000 deadline under CAA section 112(c)(5). The EPA 

challenged that claim in a motion to dismiss, arguing that the 

mandatory duty to act by the 2000 deadline was satisfied by the 

2003 rule and that the 2007 vacatur of the 2003 rule did not 

recreate the statutory duty to act by the 2000 deadline. 

Ultimately, the District Court found that the vacatur of the 

2003 rule recreated the mandatory duty to set standards by 2000 

and held that Sierra Club’s claims could continue. See Sierra 

Club v. EPA, 850 F.Supp.2d 300 (D.D.C. 2012). The EPA and Sierra 

Club then negotiated a consent decree to settle the litigation 
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and establish proposal and promulgation deadlines for 

establishing standards for these categories. 

Following the 2007 vacatur of the 2003 rule, the EPA began 

efforts to collect additional data to support new standards for 

the BSCP and clay ceramics industries. The EPA conducted an 

initial information collection effort in 2008 to update 

information on the inventory of affected units, hereafter 

referred to as “the 2008 EPA survey.” The EPA conducted a second 

information collection effort in 2010 to obtain additional 

emissions data and information on each facility’s startup, 

shutdown, and malfunction (SSM) procedures, hereafter referred 

to as “the 2010 EPA survey.” The information collected as part 

of these surveys, and not claimed as CBI by respondents, is 

available in Docket ID Nos. EPA-HQ-OAR-2013-0290 and EPA-HQ-OAR2013-0291. In addition, the dockets A–99–30 and OAR-2002-0054 

are incorporated by reference for BSCP. The dockets A-2000-48, 

OAR-2002-0055, and EPA-HQ-OAR-2006-0424 are incorporated by 

reference for clay ceramics. 

On December 18, 2014, the EPA proposed NESHAP for BSCP 

Manufacturing and NESHAP for Clay Ceramics Manufacturing. See 79 

FR 75622 (December 18, 2014). In response to a request from 

industry, the EPA extended the public comment period for the 

proposed action from February 17, 2015, to March 19, 2015. See 
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79 FR 78768 (December 31, 2014). In this action, the EPA is 

finalizing the rule. 

C. What are the health effects of pollutants emitted from the 

Brick and Structural Clay Products and Clay Ceramics 

Manufacturing source categories? 

The final rule protects air quality and promotes the public 

health by reducing emissions of HAP emitted from BSCP and clay 

ceramics kilns. Emissions data collected during development of 

the final rule show that acid gases such as HF, HCl, and Cl2

represent the predominant HAP emitted by BSCP and clay ceramics 

kilns, accounting for 99.3 percent of the total HAP emissions. 

These kilns also emit lesser amounts of other HAP compounds such 

as HAP metals and dioxins/furans, accounting for about 0.7 

percent of total HAP emissions. The HAP metals emitted include 

antimony, arsenic, beryllium, cadmium, chromium, cobalt, lead, 

manganese, mercury, nickel and selenium. Exposure to these HAP, 

depending on exposure duration and levels of exposures, can be 

associated with a variety of adverse health effects. These 

adverse health effects could include chronic health disorders 

(e.g., irritation of the lung, skin and mucus membranes, effects 

on the central nervous system and damage to the kidneys) and 

acute health disorders (e.g., lung irritation and congestion, 

alimentary effects such as nausea and vomiting and effects on 
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the kidney and central nervous system). We have classified two 

of the HAP as human carcinogens (arsenic and chromium VI) and 

four as probable human carcinogens (cadmium, lead, 

dioxins/furans and nickel). 

III. Summary of the Final Rule 

The following sections summarize the final requirements for 

the BSCP Manufacturing source category and Clay Ceramics 

Manufacturing source category. Section IV of this preamble 

summarizes the major changes since proposal. 

A. What are the final rule requirements for BSCP Manufacturing? 

1. What source category is affected by the final rule? 

The final NESHAP for BSCP Manufacturing applies to BSCP 

manufacturing facilities that are located at or are part of a 

major source of HAP emissions. The BSCP Manufacturing source 

category includes those facilities that manufacture brick (face 

brick, structural brick, brick pavers and other brick); clay 

pipe; roof tile; extruded floor and wall tile; and/or other 

extruded, dimensional clay products. 

2. What are the affected sources? 

The affected sources, which are the portions of each source 

in the category for which we are setting standards, are (1) all 

tunnel kilns at a BSCP manufacturing facility and (2) each 

periodic kiln. For purposes of the final BSCP Manufacturing 
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NESHAP, tunnel kilns are defined to include any type of 

continuous kiln used at BSCP manufacturing facilities, including 

roller kilns. 

Tunnel kilns are fired by natural gas or other fuels, 

including sawdust. Sawdust firing typically involves the use of 

a sawdust dryer because sawdust typically is purchased wet and 

needs to be dried before it can be used as fuel. Consequently, 

some sawdust-fired tunnel kilns have two process streams, 

including (1) a process stream that exhausts directly to the 

atmosphere or to an air pollution control device (APCD) and (2) 

a process stream in which the kiln exhaust is ducted to a 

sawdust dryer where it is used to dry sawdust before being 

emitted to the atmosphere. Both process streams are subject to 

the requirements of the final BSCP Manufacturing NESHAP. 

The following BSCP process units are not subject to the 

requirements of the final rule: (1) kilns that are used 

exclusively for setting glazes on previously fired products, (2) 

raw material processing and handling and (3) dryers. Sources 

regulated under the Clay Ceramics Manufacturing NESHAP or the 

Refractories Manufacturing NESHAP are not subject to the 

requirements of the BSCP Manufacturing NESHAP. 
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3. Does the final rule apply to me? 

This final BSCP Manufacturing NESHAP applies to owners and 

operators of an affected source at a major source meeting the 

requirements discussed previously in this preamble. A major 

source of HAP emissions is any stationary source or group of 

stationary sources located within a contiguous area and under 

common control that emits or has the potential to emit, 

considering controls, 10 tons per year (tpy) or more of any HAP 

or 25 tpy or more of any combination of HAP. 

4. What emission limitations and work practice standards must I 

meet? 

Emission limitations. We are providing a choice of emission 

limits for total non-Hg HAP metals and Hg for new and existing 

tunnel kilns in two subcategories based on kiln size. In this 

final BSCP Manufacturing NESHAP, a large tunnel kiln is defined 

as a new or existing tunnel kiln with a design capacity of 10 

tons per hour (tph) or greater, and a small tunnel kiln is 

defined as a new or existing tunnel kiln with a design capacity 

of less than 10 tph. The options for total non-Hg HAP metals 

include total non-Hg HAP metals limits in units of pounds per 

hour (lb/hr) and options for limiting PM as a surrogate for nonHg HAP metals in units of pounds per ton (lb/ton) or grains per 

dry standard cubic foot (gr/dscf) at 17 percent oxygen (O2). The 
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options for Hg include emission limits in units of lb/ton, lb/hr 

or micrograms per dry standard cubic meter (μg/dscm) at 17 

percent O2. We are also issuing an emission limit for HClequivalent for all existing and new tunnel kilns at the facility 

to reduce the acid gases HF, HCl and Cl2. The emission limits for 

acid gases, Hg, and non-Hg HAP metals are presented in Table 4 

of this preamble. 

TABLE 4. ACID GASES, TOTAL NON-MERCURY HAP METALS AND MERCURY EMISSION LIMITS 

FOR BRICK AND STRUCTURAL CLAY PRODUCTS TUNNEL KILNS

Subcategory Acid gases 

Total non-Hg HAP 

metals Hg 

Limits for existing sources 

Large tunnel kilns 

(≥ 10 tph) 

-- 0.036 lb/ton PM 

OR 0.0029 gr/dscf 

PM at 17 percent 

O2 OR 0.0057 

lb/hr non-Hg HAP 

metals for each 

existing tunnel 

kiln at facility 

4.0 E-05 lb/ton OR 

5.4 E-04 lb/hr OR 

7.6 μg/dscm at 17 

percent O2 for 

each existing 

large tunnel kiln 

at facility 

Small tunnel kilns 

(< 10 tph) 

-- 0.37 lb/ton PM OR 

0.0021 gr/dscf PM 

at 17 percent O2

OR 0.11 lb/hr 

non-Hg HAP metals 

for each existing 

tunnel kiln at 

facility 

3.3 E-04 lb/ton OR 

0.0019 lb/hr OR 88

μg/dscm at 17 

percent O2 for 

each existing 

small tunnel kiln 

at facility 

All tunnel kilns 57 lb/hr HClequivalent for 

collection of 

all tunnel kilns 

at facility 

-- -- 

Limits for new sources 

Large tunnel kilns 

(≥ 10 tph) 

-- 0.032 lb/ton PM 

OR 0.0024 gr/dscf 

PM at 17 percent 

O2 OR 0.0057 

lb/hr non-Hg HAP 

metals for each 

new tunnel kiln 

2.8 E-05 lb/ton OR 

3.4 E-04 lb/hr OR 

6.1 μg/dscm at 17 

percent O2 for 

each new large 

tunnel kiln at 

facility 
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Subcategory Acid gases 

Total non-Hg HAP 

metals Hg 

at facility 

Small tunnel kilns 

(< 10 tph) 

-- 0.032 lb/ton PM 

OR 0.0021 gr/dscf 

PM at 17 percent 

O2 OR 0.11 lb/hr 

non-Hg HAP metals 

for each new 

tunnel kiln at 

facility 

3.3 E-04 lb/ton OR 

0.0019 lb/hr OR 88

μg/dscm at 17 

percent O2 for 

each new small 

tunnel kiln at 

facility 

All tunnel kilns 57 lb/hr HClequivalent for 

collection of 

all tunnel kilns 

at facility 

-- -- 

Work practice standards. We are issuing work practice 

standards for BSCP periodic kilns in lieu of HAP emission 

limits. The work practice standards require developing and using 

a designed firing time and temperature cycle for each periodic 

kiln; labeling each periodic kiln with the maximum load (in 

tons) of product that can be fired in the kiln during a single 

firing cycle; documenting the total tonnage placed in the kiln 

for each load to ensure that it is not greater than the maximum 

load; developing and implementing maintenance procedures for 

each kiln that specify the frequency of inspection and 

maintenance; and developing and maintaining records for each 

periodic kiln, including logs to document the proper operation 

and maintenance procedures of the periodic kilns. 
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We are also issuing work practice standards for BSCP tunnel 

kilns in lieu of dioxin/furan emission limits. The work practice 

standards require maintaining and inspecting the burners and 

associated combustion controls (as applicable); tuning the 

specific burner type to optimize combustion; keeping records of 

each burner tune-up; and submitting a report for each tune-up 

conducted. As discussed in section III.C.1.a of this preamble, 

we are also issuing work practice standards for periods of 

startup and shutdown. 

5. What are the testing and initial compliance requirements? 

We are requiring that owners and operators of all affected 

sources subject to emission limits conduct an initial 

performance test using specified EPA test methods to demonstrate 

initial compliance with all applicable emission limits. A 

performance test must be conducted before renewing the 

facility’s 40 CFR part 70 operating permit or at least every 5 

years following the initial performance test, as well as when an 

operating limit parameter value is being revised. 

Under the final BSCP Manufacturing NESHAP, the owner or 

operator is required to measure emissions of HF, HCl, Cl2, Hg and 

PM (or non-Hg HAP metals). We are requiring that the owner or 

operator measure HF, HCl and Cl2 using one of the following 

methods: 
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 EPA Method 26A, “Determination of Hydrogen Halide and 

Halogen Emissions from Stationary Sources-Isokinetic 

Method,” 40 CFR part 60, appendix A-8; 

 EPA Method 26, “Determination of Hydrogen Chloride 

Emissions from Stationary Sources,” 40 CFR part 60, 

appendix A-8, when no acid particulate (e.g., HF, HCl or Cl2

dissolved in water droplets emitted by sources controlled 

by a wet scrubber) is present; 

 EPA Method 320, “Measurement of Vapor Phase Organic and 

Inorganic Emission by Extractive FTIR” 40 CFR part 63, 

appendix A, provided the test follows the analyte spiking 

procedures of section 13 of Method 320, unless the owner or 

operator can demonstrate that the complete spiking 

procedure has been conducted at a similar source; or 

 Any other alternative method that has been approved by the 

Administrator under 40 CFR 63.7(f) of the General 

Provisions. 

Following the performance test, the owner or operator must 

calculate the HCl-equivalent for the kiln using Equation 2 in 40 

CFR 63.8445(f)(2)(i). If there are multiple kilns at a facility, 

the owner or operator must sum the HCl-equivalent for each kiln 

using Equation 3 in 40 CFR 63.8445(f)(2)(ii) to get the total 

facility HCl-equivalent and compare this value to the HBEL for 

acid gases. 

If the owner or operator chooses to comply with one of the 

two PM emission limits, we are requiring that the owner or 

operator measure PM emissions using one of the following 

methods: 

 EPA Method 5, “Determination of Particulate Emissions from 

Stationary Sources,” 40 CFR part 60, appendix A-3; 

 EPA Method 29, “Determination of Metals Emissions From 

Stationary Sources,” 40 CFR part 60, appendix A-8; or 
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 Any other alternative method that has been approved by the 

Administrator under 40 CFR 63.7(f) of the General 

Provisions. 

If the owner or operator chooses to comply with the non-Hg 

HAP metals emission limit instead of one of the PM emission 

limits, the owner or operator must measure non-Hg HAP metals 

emissions using EPA Method 29 cited above or any other 

alternative method that has been approved by the Administrator 

under 40 CFR 63.7(f) of the General Provisions. The owner or 

operator may also use Method 29 or any other approved 

alternative method to measure Hg emissions. 

The following paragraphs discuss the initial compliance 

requirements. Prior to the initial performance test, the owner 

or operator is required to install the continuous parameter 

monitoring system (CPMS) equipment (as discussed in section 

III.A.6 of this preamble) to be used to demonstrate continuous 

compliance with the operating limits. During the initial test, 

the owner or operator must use the CPMS to establish sitespecific operating parameter values that represent the operating 

limits. 

For a DIFF or DLS/FF, we are requiring that the owner or 

operator ensure that lime in the feed hopper or silo and to the 

APCD is free-flowing at all times during the HF/HCl/Cl2

performance test and record the feeder setting (on a per ton of 
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fired product basis) for the three test runs. If the lime feed 

rate varies, the owner or operator is required to determine the 

average feed rate from the three test runs. The average of the 

three test runs establishes the minimum site-specific feed rate 

operating limit. If there are different average feed rate values 

during the PM/non-Hg HAP metals and HF/HCl/Cl2 tests, the highest 

of the average values becomes the site-specific operating limit. 

If a BLD system is present, the owner or operator is required to 

submit analyses and supporting documentation demonstrating 

conformance with EPA guidance and specifications for BLD 

systems. 

For a stand-alone FF (i.e., no dry sorbent injection or 

DLS) and a BLD system, we are requiring that the owner or 

operator submit analyses and supporting documentation 

demonstrating conformance with EPA guidance and specifications 

for BLD systems. 

For a dry limestone adsorber (DLA), we are requiring that 

the owner or operator continuously measure the pressure drop 

across the DLA during the HF/HCl/Cl2 performance test and 

determine the 3-hour block average pressure drop. The average of 

the three test runs establishes the minimum site-specific 

pressure drop operating limit. Alternatively, the owner or 

operator may continuously monitor the bypass stack damper 
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position at least once every 15 minutes during the performance 

test. The owner or operator also must maintain an adequate 

amount of limestone in the limestone hopper, storage bin 

(located at the top of the DLA) and DLA at all times. In 

addition, the owner or operator is required to establish the 

limestone feeder setting (on a per ton of fired product basis) 1 

week prior to the performance test and maintain the feeder 

setting for the 1-week period that precedes the performance test 

and during the performance test. Finally, the owner or operator 

must document the source and grade of the limestone used during 

the performance test. 

For a wet scrubber, we are requiring that the owner or 

operator continuously measure the scrubber pressure drop during 

the PM/non-Hg HAP metals performance test, the scrubber liquid 

pH and chemical addition rate (if applicable) during the 

HF/HCl/Cl2 performance test and the scrubber liquid flow rate 

during both the PM/non-Hg HAP metals and HF/HCl/Cl2 performance 

tests. For each wet scrubber parameter, the owner or operator is 

required to determine and record the average values for the 

three test runs and the 3-hour block average value. The average 

of the three test runs establishes the minimum site-specific 

pressure drop, liquid pH, liquid flow rate and chemical addition 

rate operating limits. If different average wet scrubber liquid 
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flow rate values are measured during the PM/non-Hg HAP metals 

and HF/HCl/Cl2 tests, the highest of the average values become 

the site-specific operating limit. 

For an activated carbon injection (ACI) system, we are 

requiring that the owner or operator measure the activated 

carbon flow rate during the Hg performance test and determine 

the 3-hour block average flow rate. The average of the three 

test runs establishes the minimum site-specific activated carbon 

flow rate operating limit. 

For a source with no APCD installed, we are requiring that 

the owner or operator calculate the maximum potential HClequivalent using Equation 4 in 40 CFR 63.8445(g)(1)(i). The 

owner or operator must use the results from the performance test 

to determine the emissions at the maximum possible process rate. 

For example, if the design capacity of the kiln is 10 tph and 

the production rate during the performance test was 9 tph, then 

the test results represent 90 percent of the maximum potential 

emissions. If there are multiple kilns at a facility, the owner 

or operator must sum the maximum potential HCl-equivalent for 

each kiln to get the total facility maximum potential HClequivalent and compare this value to the HBEL for acid gases. If 

the total facility maximum potential HCl-equivalent is greater 

than the HBEL, we are requiring that the owner or operator 
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determine the maximum process rate for which the total facility 

maximum potential HCl-equivalent remains at or below the HBEL. 

If there are multiple kilns, the owner or operator must 

determine one or more combinations of maximum process rates that 

result in a total facility maximum potential HCl-equivalent that 

remains at or below the HBEL. The maximum process rate(s) 

becomes the operating limit(s) for process rate. 

6. What are the continuous compliance requirements? 

The final BSCP Manufacturing NESHAP requires that the owner 

or operator demonstrate continuous compliance with each emission 

limitation that applies. The owner or operator must follow the 

requirements in the operation, maintenance and monitoring (OM&M) 

plan and document conformance with the OM&M plan. The owner or 

operator must also operate a CPMS to monitor the operating 

parameters established during the initial performance test as 

described in the following paragraphs. The CPMS must collect 

data at least every 15 minutes, including at least three of four 

equally spaced data values (or at least 75 percent if there are 

more than four data values per hour) per hour to have a valid 

hour of data. The owner or operator must operate the CPMS at all 

times when the process is operating. The owner or operator must 

also conduct proper maintenance of the CPMS (including 

inspections, calibrations and validation checks) and maintain an 
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inventory of necessary parts for routine repairs of the CPMS. 

Using the recorded readings, the owner or operator must 

calculate and record the 3-hour block average values of each 

operating parameter. To calculate the average for each 3-hour 

averaging period, the owner or operator must have at least 75 

percent of the recorded readings for that period. 

For a DIFF or DLS/FF, we are requiring that the owner or 

operator demonstrate compliance with the acid gas (HF/HCl/Cl2) 

HBEL by maintaining free-flowing lime in the feed hopper or silo 

and to the APCD at all times. If lime is not flowing freely, 

according to load cell output, carrier gas/lime flow indicator, 

carrier gas pressure drop measurement system or other system, 

the owner or operator must promptly initiate and complete 

corrective actions according to the OM&M plan. The owner or 

operator must also maintain the feeder setting (on a per ton of 

fired product basis) at or above the level established during 

the HF/HCl/Cl2 performance test and record the feeder setting 

once each shift. 

The final rule provides the option to use either a BLD 

system or VE monitoring to demonstrate parametric compliance. 

For the option of a BLD system, we are requiring that the 

owner or operator initiate corrective action within 1 hour of a 

BLD system alarm and complete corrective actions according to 
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the OM&M plan. The owner or operator must also operate and 

maintain the FF such that the alarm is not engaged for more than 

5 percent of the total operating time in a 6-month block 

reporting period. In calculating this operating time fraction, 

the owner or operator must not count any alarm time if 

inspection of the FF demonstrates that no corrective action is 

required. If corrective action is required, the owner or 

operator must count each alarm as a minimum of 1 hour. If 

corrective action is initiated more than 1 hour after an alarm, 

the owner or operator must count as alarm time the actual amount 

of time taken to initiate corrective action. 

For the option of monitoring VE, we are requiring that the 

owner or operator perform daily, 15-minute VE observations in 

accordance with the procedures of EPA Method 22, “Visual 

Determination of Fugitive Emissions from Material Sources and 

Smoke Emissions from Flares,” 40 CFR part 60, appendix A-7. 

During the VE observations, the kiln must be operating under 

normal conditions. If VE are observed, the owner or operator 

must promptly initiate and complete corrective actions according 

to the OM&M plan. If no VE are observed in 30 consecutive daily 

EPA Method 22 tests, the owner or operator may decrease the 

frequency of EPA Method 22 testing from daily to weekly for that 

kiln stack. If VE are observed during any weekly test, the owner 
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or operator must promptly initiate and complete corrective 

actions according to the OM&M plan and the owner or operator 

must resume EPA Method 22 testing of that kiln stack on a daily 

basis until no VE are observed in 30 consecutive daily tests, at 

which time the owner or operator may again decrease the 

frequency of EPA Method 22 testing to a weekly basis. 

For a stand-alone FF, we are requiring that the owner or 

operator use a BLD system or monitor VE as described above to 

demonstrate parametric compliance. 

For a DLA, we are requiring that the owner or operator 

demonstrate compliance with the acid gas (HF/HCl/Cl2) HBEL by 

collecting and recording data documenting the DLA pressure drop 

and reducing the data to 3-hour block averages. The owner or 

operator must maintain the average pressure drop across the DLA 

for each 3-hour block period at or above the average pressure 

drop established during the HF/HCl/Cl2 performance test. 

Alternatively, the owner or operator may continuously monitor 

the bypass stack damper position at least once every 15 minutes 

during normal kiln operation. Any period in which the bypass 

damper is opened allowing the kiln exhaust gas to bypass the DLA 

triggers corrective actions according to the OM&M plan. The 

owner or operator also must verify that the limestone hopper, 

storage bin (located at the top of the DLA) and DLA contain an 
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adequate amount of limestone by performing a daily visual check 

of the limestone hopper and the storage bin. A daily visual 

check could include one of the following: (1) conducting a 

physical check of the hopper; (2) creating a visual access 

point, such as a window, on the side of the hopper; (3) 

installing a camera in the hopper that provides continuous feed 

to a video monitor in the control room; or (4) confirming that 

load level indicators in the hopper are not indicating the need 

for additional limestone. If the hopper or storage bin does not 

contain adequate limestone, the owner or operator must promptly 

initiate and complete corrective actions according to the OM&M 

plan. The owner or operator also must record the limestone 

feeder setting daily (on a per ton of fired product basis) to 

verify that the feeder setting is being maintained at or above 

the level established during the HF/HCl/Cl2 performance test. The 

owner or operator also must use the same grade of limestone from 

the same source as was used during the HF/HCl/Cl2 performance 

test and maintain records of the source and type of limestone. 

Finally, the owner or operator must monitor VE, as described in 

the previous paragraph. 

For a wet scrubber, we are requiring that the owner or 

operator continuously maintain the 3-hour block averages for 

scrubber pressure drop, scrubber liquid pH, scrubber liquid flow 
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rate and chemical addition rate (if applicable) at or above the 

minimum values established during the applicable performance 

test. Maintaining the 3-hour block average for scrubber pressure 

drop at or above the minimum value established during the 

PM/non-Hg HAP metals performance test demonstrates compliance 

with the PM/non-Hg HAP metals emission limit. Maintaining the 3-

hour block average for scrubber liquid pH and chemical (e.g., 

lime, caustic) addition rate at or above the minimum values 

established during the HF/HCl/Cl2 performance test demonstrates 

compliance with the acid gas (HF/HCl/Cl2) HBEL. Maintaining the 

3-hour block average for scrubber liquid flow rate at or above 

the lowest minimum value established during the PM/non-Hg HAP 

metals and HF/HCl/Cl2 performance tests demonstrates compliance 

with all applicable emission limits by showing that the scrubber 

is in proper working order. 

For an ACI system, we are requiring that the owner or 

operator demonstrate compliance with the Hg emission limit by 

continuously monitoring the activated carbon flow rate and 

maintaining it at or above the operating limit established 

during the Hg performance test. 

For sources with no APCD, we are requiring that the owner 

or operator monitor VE as described above to demonstrate 

compliance with the PM/non-Hg HAP metals emission limit. In 
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addition, if the last calculated total facility maximum 

potential HCl-equivalent was not at or below the HBEL for acid 

gases, then we are requiring that the owner or operator collect 

and record data documenting the process rate of the kiln and 

reduce the data to 3-hour block averages. The owner or operator 

must maintain the kiln process rate(s) at or below the kiln 

process rate operating limit(s) that enables the total facility 

maximum potential HCl-equivalent to remain at or below the HBEL. 

7. What are the notification, recordkeeping and reporting 

requirements? 

All new and existing sources are required to comply with 

certain requirements of the General Provisions (40 CFR part 63, 

subpart A), which are identified in Table 10 of subpart JJJJJ. 

The General Provisions include specific requirements for 

notifications, recordkeeping and reporting. 

Each owner or operator is required to submit a notification 

of compliance status report, as required by 40 CFR 63.9(h) of 

the General Provisions. The final BSCP Manufacturing NESHAP 

requires the owner or operator to include in the notification of 

compliance status report certifications of compliance with rule 

requirements. Semiannual compliance reports, as required by 40 

CFR 63.10(e)(3) of subpart A, are also required for each 

semiannual reporting period. 
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The final BSCP Manufacturing NESHAP requires records to 

demonstrate compliance with each emission limit and work 

practice standard. These recordkeeping requirements are 

specified directly in the General Provisions to 40 CFR part 63 

and are identified in Table 8 of subpart JJJJJ. 

Specifically, we are requiring that the owner or operator 

keep the following records: 

 All reports and notifications submitted to comply with the 

final BSCP Manufacturing NESHAP. 

 Records of performance tests. 

 Records relating to APCD maintenance and documentation of 

approved routine control device maintenance exemption. 

 Continuous monitoring data as required in the final BSCP 

Manufacturing NESHAP. 

 Records of BLD system alarms and corrective actions taken. 

 Records of each instance in which the owner or operator did 

not meet each emission limit (i.e., deviations from 

operating limits). 

 Records of production rates. 

 Records of approved alternative monitoring or testing 

procedures. 

 Records of maintenance and inspections performed on the 

APCD. 

 Current copies of the OM&M plan and records documenting 

conformance. 

 Logs of the information required to document compliance 

with the periodic kiln work practice standard. 

 Records of burner tune-ups used to comply with the 

dioxin/furan work practice standard for tunnel kilns. 

 Logs of the information required to document compliance 

with the startup and shutdown work practice standards. 

 Records of each malfunction and the corrective action 

taken. 

 Records of parameters and procedures followed for work 

practice standards. 
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We are also requiring that the owner or operator submit the 

following reports and notifications: 

 Notifications required by the General Provisions. 

 Initial Notification no later than 120 calendar days after 

the affected source becomes subject to this subpart. 

 Notification of Intent to conduct performance tests and/or 

other compliance demonstration at least 60 calendar days 

before the performance test and/or other compliance 

demonstration is scheduled. 

 Notification of Compliance Status 60 calendar days 

following completion of a compliance demonstration that 

includes a performance test. 

 Notification of Compliance Status 30 calendar days 

following completion of a compliance demonstration that 

does not include a performance test (i.e., compliance 

demonstrations for the work practice standards). 

 Compliance reports semi-annually, including a report of the 

most recent burner tune-up conducted to comply with the 

dioxin/furan work practice standard and a report of each 

malfunction resulting in an exceedance and the corrective 

action taken. 

 Results of each performance test within 60 calendar days of 

completing the test, submitted to the EPA by direct 

computer-to-computer electronic transfer via EPA-provided 

software for data collected using supported test methods 

(see section III.E of this preamble for more information). 

B. What are the final rule requirements for Clay Ceramics 

Manufacturing? 

1. What source category is affected by the final rule? 

This final rule for Clay Ceramics Manufacturing applies to 

clay ceramics manufacturing facilities that are located at or 

are part of a major source of HAP emissions. The Clay Ceramics 

Manufacturing source category includes those facilities that 
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manufacture pressed floor tile, pressed wall tile and other 

pressed tile; or sanitaryware (e.g., toilets and sinks). 

2. What are the affected sources? 

The affected sources, which are the portions of each source 

in the category for which we are setting standards, are (1) each 

ceramic tile roller kiln; (2) each floor tile press dryer; (3) 

each ceramic tile spray dryer; (4) each ceramic tile glaze line 

using glaze spraying; (5) each sanitaryware tunnel kiln; (6) 

each sanitaryware shuttle kiln; and (7) each sanitaryware glaze 

spray booth. 

The following clay ceramics process units are not subject 

to the requirements of the final rule: (1) tunnel, roller or 

shuttle kilns that are used exclusively for refiring; (2) 

tunnel, roller or shuttle kilns that are used exclusively for 

setting glazes on previously fired products; (3) glaze spray 

operations that are used exclusively with those kilns listed in 

items 1 and 2 above; (4) process units listed in items 1 through 

3 above that are permitted to, but do not, process first-fire 

ware, until such time as they begin to process first-fire ware; 

(5) refire shuttle kilns that fire no more than four batches per 

year of first-fire ware; (6) glaze spray operations that on 

average use wet glazes containing less than 0.1 (weight) percent 

metal HAP (dry weight basis) per spray booth over an entire 
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calendar year; (7) raw material processing and handling; (8) 

wall tile press dryers; and (9) sanitaryware ware dryers. 

Sources regulated under the BSCP Manufacturing NESHAP or the 

Refractories Manufacturing NESHAP are not subject to the 

requirements of the Clay Ceramics Manufacturing NESHAP. 

3. Does the final rule apply to me? 

This final Clay Ceramics Manufacturing NESHAP applies to 

owners and operators of an affected source at a major source 

meeting the requirements discussed previously in this preamble. 

A major source of HAP emissions is any stationary source or 

group of stationary sources located within a contiguous area and 

under common control that emits or has the potential to emit, 

considering controls, 10 tpy or more of any HAP or 25 tpy or 

more of any combination of HAP. 

4. What emission limitations and work practice standards must I 

meet? 

Emission limitations. We are issuing emission limits for PM 

as a surrogate for total non-Hg HAP metals (in units of lb/ton) 

for all new and existing ceramic tile roller kilns, sanitaryware 

tunnel kilns and ceramic tile and sanitaryware glazing 

operations. We are issuing emission limits for Hg (lb/ton) for 

all new and existing ceramic tile roller kilns, ceramic tile 

glaze lines and sanitaryware tunnel kilns. We are issuing 
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emission limits for dioxin/furan (nanograms of 2,3,7,8-

tetrachlorodibenzo-p-dioxin toxic equivalents (TEQ) per kilogram 

(ng/kg)) for all new and existing ceramic tile roller kilns, 

sanitaryware tunnel kilns, floor tile press dryers and ceramic 

tile spray dryers. We are also issuing an emission limit for 

HCl-equivalent for all existing and new roller and tunnel kilns 

at each facility to reduce the acid gases HF and HCl. The 

emission limits are presented in Table 5 of this preamble. 

TABLE 5. EMISSION LIMITS FOR CLAY CERAMICS SOURCES

Subcategory 

Acid gases 

(lb/hr HClequivalent)a

Hg 

(lb/ton)

PMb

(lb/ton) 

Dioxins/furans 

(ng/kg)c

Limits for existing sources 

Floor tile roller kilns 140 1.3 E-04 0.13 2.8 

Floor tile press dryers -- -- -- 0.024 

Floor tile spray dryers -- -- -- 19 

Wall tile roller kilns 140 2.1 E-04 0.37 0.22 

Wall tile spray dryers -- -- -- 0.058 

Tile glaze lines -- 1.6 E-04 1.9 -- 

First-fire sanitaryware 

tunnel kilns 

140 2.6 E-04 0.34 3.3 

Sanitaryware manual glaze 

application 

-- -- 35 -- 

Sanitaryware spray 

machine glaze application 

-- -- 13 -- 

Sanitaryware robot glaze 

application 

-- -- 8.9 -- 

Limits for new sources 

Floor tile roller kilns 140 3.9 E-05 0.037 1.3 

Floor tile press dryers -- -- -- 0.024 

Floor tile spray dryers -- -- -- 0.071 

Wall tile roller kilns 140 2.1 E-04 0.37 0.22 

Wall tile spray dryers -- -- -- 0.058 

Tile glaze lines -- 1.6 E-04 0.61 -- 
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Subcategory 

Acid gases 

(lb/hr HClequivalent)a

Hg 

(lb/ton)

PMb

(lb/ton) 

Dioxins/furans 

(ng/kg)c

First-fire sanitaryware 

tunnel kilns 

140 1.3 E-04 0.095 0.99 

Sanitaryware manual glaze 

application 

-- -- 3.9 -- 

Sanitaryware spray 

machine glaze application 

-- -- 3.2 -- 

Sanitaryware robot glaze 

application 

-- -- 2.4 -- 

a Limit applies to collection of all kilns at facility. 

b PM is a surrogate for non-Hg HAP metals. 

c ng/kg = nanograms per kilogram. 

Work practice standards. We are issuing work practice 

standards in lieu of emission limits for acid gases (HF and 

HCl), Hg and non-Hg HAP metals for sanitaryware shuttle kilns. 

The work practice standards require using natural gas (or 

equivalent) as kiln fuel except during periods of natural gas 

curtailment or supply interruption; developing and using a 

designed firing time and temperature cycle for each shuttle 

kiln; labeling each shuttle kiln with the maximum load (in tons) 

of throughput (greenware) that can be fired in the kiln during a 

single firing cycle; documenting the total tonnage of greenware 

placed in the kiln for each load to ensure that it is not 

greater than the maximum load; developing and implementing 

maintenance procedures for each kiln that specify the frequency 

of inspection and maintenance; and developing and maintaining 

records for each shuttle kiln, including logs to document the 
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proper operation and maintenance procedures of the shuttle 

kilns. As discussed in section III.c.1.b of this preamble, we 

are also issuing work practice standards for periods of startup 

and shutdown. 

5. What are the testing and initial compliance requirements? 

We are requiring that owners and operators of all affected 

sources subject to emission limits conduct an initial 

performance test using specified EPA test methods to demonstrate 

initial compliance with all applicable emission limits. A 

performance test must be conducted before renewing the 

facility’s 40 CFR part 70 operating permit or at least every 5 

years following the initial performance test, as well as when an 

operating limit parameter value is being revised. 

Under the final Clay Ceramics Manufacturing NESHAP, the 

owner or operator is required to measure emissions of HF, HCl, 

Hg, PM (as a surrogate for non-Hg HAP metals) and 

dioxins/furans. The owner or operator must measure HF and HCl 

from ceramic tile roller kilns and sanitaryware first-fire 

tunnel kilns using one of the following methods: 

 EPA Method 26A, “Determination of Hydrogen Halide and 

Halogen Emissions from Stationary Sources-Isokinetic 

Method,” 40 CFR part 60, appendix A-8; 

 EPA Method 26, “Determination of Hydrogen Chloride 

Emissions from Stationary Sources,” 40 CFR part 60, 

appendix A-8, when no acid particulate (e.g., HF or HCl 
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dissolved in water droplets emitted by sources controlled 

by a wet scrubber) is present; 

 EPA Method 320, “Measurement of Vapor Phase Organic and 

Inorganic Emission by Extractive FTIR” 40 CFR part 63, 

appendix A, provided the test follows the analyte spiking 

procedures of section 13 of Method 320, unless the owner or 

operator can demonstrate that the complete spiking 

procedure has been conducted at a similar source; or 

 Any other alternative method that has been approved by the 

Administrator under 40 CFR 63.7(f) of the General 

Provisions. 

Following the performance test, the owner or operator must 

calculate the HCl-equivalent for the kiln using Equation 4 in 40 

CFR 63.8595(f)(4)(i). If there are multiple kilns at a facility, 

the owner or operator must sum the HCl-equivalent for each kiln 

using Equation 5 in 40 CFR 63.8595(f)(4)(ii) to get the total 

facility HCl-equivalent and compare this value to the HBEL. 

We are requiring that the owner or operator measure PM 

emissions from ceramic tile roller kilns and sanitaryware firstfire tunnel kilns using one of the following methods: 

 EPA Method 5, “Determination of Particulate Emissions from 

Stationary Sources,” 40 CFR part 60, appendix A-3; 

 EPA Method 29, “Determination of Metals Emissions From 

Stationary Sources,” 40 CFR part 60, appendix A-8; or 

 Any other alternative method that has been approved by the 

Administrator under 40 CFR 63.7(f) of the General 

Provisions. 

Method 29 or any other approved alternative method may also 

be used to measure Hg emissions from ceramic tile roller kilns, 

ceramic tile glaze lines and sanitaryware first-fire tunnel 

kilns. 
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We are requiring that the owner or operator measure PM 

emissions from ceramic tile and sanitaryware glaze spray booths 

using EPA Method 5 or any other alternative method that has been 

approved by the Administrator under 40 CFR 63.7(f) of the 

General Provisions. 

We are also requiring that the owner or operator measure 

dioxin/furan emissions from ceramic tile roller kilns and spray 

dryers, floor tile press dryers and sanitaryware first-fire 

tunnel kilns using EPA Method 23, “Determination of 

Polychlorinated Dibenzo-p-Dioxins and Polychlorinated 

Dibenzofurans From Stationary Sources,” 40 CFR part 60, appendix 

A-7 or any other alternative method that has been approved by 

the Administrator under 40 CFR 63.7(f) of the General 

Provisions. 

The following paragraphs discuss the initial compliance 

requirements. Prior to the initial performance test, the owner 

or operator is required to install the CPMS equipment (as 

discussed in section III.B.6 of this preamble) to be used to 

demonstrate continuous compliance with the operating limits. 

During the initial test, the owner or operator must use the CPMS 

to establish site-specific operating parameter values that 

represent the operating limits. 
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For a DIFF or DLS/FF, we are requiring that the owner or 

operator ensure that lime in the feed hopper or silo and to the 

APCD is free-flowing at all times during the HF/HCl performance 

test and record the feeder setting (on a per ton of fired 

product basis) for the three test runs. If the lime feed rate 

varies, the owner or operator is required to determine the 

average feed rate from the three test runs. The average of the 

three test runs establishes the minimum site-specific feed rate 

operating limit. If there are different average feed rate values 

during the PM and HF/HCl tests, the highest of the average 

values becomes the site-specific operating limit. If a BLD 

system is present, the owner or operator is required to submit 

analyses and supporting documentation demonstrating conformance 

with EPA guidance and specifications for BLD systems. 

For a stand-alone FF (i.e., no dry sorbent injection or 

DLS) and a BLD system, we are requiring that the owner or 

operator submit analyses and supporting documentation 

demonstrating conformance with EPA guidance and specifications 

for BLD systems. 

For a wet scrubber, we are requiring that the owner or 

operator continuously measure the scrubber pressure drop during 

the PM performance test, the scrubber liquid pH and the chemical 

addition rate (if applicable) during the HF/HCl performance test 
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and the scrubber liquid flow rate during both the PM and HF/HCl 

performance tests. For each wet scrubber parameter, the owner or 

operator is required to determine and record the average values 

for the three test runs and the 3-hour block average value. The 

average of the three test runs establishes the minimum sitespecific pressure drop, liquid pH, liquid flow rate and chemical 

addition rate operating limits. If different average wet 

scrubber liquid flow rate values are measured during the PM and 

HF/HCl tests, the highest of the average values become the sitespecific operating limits. 

For an ACI system, we are requiring that the owner or 

operator measure the activated carbon flow rate during the Hg 

and dioxin/furan performance tests and determine the 3-hour 

block average flow rate. The average of the three test runs 

establishes the minimum site-specific activated carbon flow rate 

operating limit. If different average activated carbon flow rate 

values are measured during the Hg and dioxin/furan tests, the 

highest of the average values becomes the site-specific 

operating limit. 

If the owner or operator intends to comply with the 

dioxin/furan emission limit without an ACI system, we are 

requiring that the owner or operator measure the peak 

temperature of the tunnel or roller kiln and the operating 
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temperature of the ceramic tile spray dryer and floor tile press 

dryer during the dioxin/furan performance test and determine the 

3-hour block average temperature. The average of the three test 

runs establishes the site-specific operating limit. 

For sources with no APCD installed, we are requiring that 

the owner or operator calculate the maximum potential HClequivalent using Equation 6 in 40 CFR 63.8595(g)(1)(i). The 

owner or operator must use the results from the performance test 

to determine the emissions at the maximum possible process rate. 

For example, if the design capacity of the tunnel or roller kiln 

is 10 tph and the production rate during the performance test 

was 9 tph, then the test results represent 90 percent of the 

maximum potential emissions. If there are multiple kilns at a 

facility, the owner or operator must sum the maximum potential 

HCl-equivalent for each kiln to get the total facility maximum 

potential HCl-equivalent and compare this value to the HBEL for 

acid gases. If the total facility maximum potential HClequivalent is greater than the HBEL, we are requiring that the 

owner or operator determine the maximum process rate for which 

the total facility maximum potential HCl-equivalent remains at 

or below the HBEL. If there are multiple kilns, the owner or 

operator must determine one or more combinations of maximum 

process rates that result in a total facility maximum potential 
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HCl-equivalent that remains at or below the HBEL. The maximum 

process rate(s) becomes the operating limit(s) for process rate. 

We are also requiring that the owner or operator measure the 

peak temperature of the kiln and operating temperature of the 

ceramic tile spray dryer and floor tile press dryer during the 

dioxin/furan performance test and determine the 3-hour block 

average temperature. The average of the three test runs 

establishes the site-specific operating limit for temperature. 

6. What are the continuous compliance requirements? 

The final Clay Ceramics Manufacturing NESHAP requires that 

the owner or operator demonstrate continuous compliance with 

each emission limitation that applies. The owner or operator 

must follow the requirements in the OM&M plan and document 

conformance with the OM&M plan. The owner or operator must also 

operate a CPMS to monitor the operating parameters established 

during the initial performance test as described in the 

following paragraphs. The CPMS must collect data at least every 

15 minutes, including at least three of four equally spaced data 

values (or at least 75 percent if there are more than four data 

values per hour) per hour to have a valid hour of data. The 

owner or operator must operate the CPMS at all times when the 

process is operating. The owner or operator must also conduct 

proper maintenance of the CPMS, including inspections, 
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calibrations and validation checks, and maintain an inventory of 

necessary parts for routine repairs of the CPMS. Using the 

recorded readings, the owner or operator must calculate and 

record the 3-hour block average values of each operating 

parameter. To calculate the average for each 3-hour averaging 

period, the owner or operator must have at least 75 percent of 

the recorded readings for that period. 

For a DIFF or DLS/FF, we are requiring that the owner or 

operator demonstrate compliance with the acid gas (HF/HCl) HBEL 

by maintaining free-flowing lime in the feed hopper or silo and 

to the APCD at all times. If lime is found not to be free 

flowing via the output of a load cell, carrier gas/lime flow 

indicator, carrier gas pressure drop measurement system or other 

system, the owner or operator must promptly initiate and 

complete corrective actions according to the OM&M plan. The 

owner or operator must also maintain the feeder setting (on a 

per ton of throughput basis) at or above the level established 

during the performance test and record the feeder setting once 

each shift. 

For a DIFF or DLS/FF, the final rule provides the option to 

use either a BLD system or VE monitoring to demonstrate 

parametric compliance. 
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For the option of a BLD system, we are requiring that the 

owner or operator initiate corrective action within 1 hour of a 

BLD system alarm and complete corrective actions according to 

the OM&M plan. The owner or operator must also operate and 

maintain the FF such that the alarm is not engaged for more than 

5 percent of the total operating time in a 6-month block 

reporting period. In calculating this operating time fraction, 

if inspection of the FF demonstrates that no corrective action 

is required, no alarm time is counted. If corrective action is 

required, each alarm must be counted as a minimum of 1 hour and 

if corrective action is initiated more than 1 hour after an 

alarm, the alarm time must be counted as the actual amount of 

time taken to initiate corrective action. 

For the option of monitoring VE, we are requiring that the 

owner or operator perform daily, 15-minute VE observations in 

accordance with the procedures of EPA Method 22, “Visual 

Determination of Fugitive Emissions from Material Sources and 

Smoke Emissions from Flares,” 40 CFR part 60, appendix A-7. 

During the VE observations, the source must be operating under 

normal conditions. If VE are observed, the owner or operator 

must promptly initiate and complete corrective actions according 

to the OM&M plan. If no VE are observed in 30 consecutive daily 

EPA Method 22 tests, the owner or operator may decrease the 
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frequency of EPA Method 22 testing from daily to weekly for that 

source. If VE are observed during any weekly test, the owner or 

operator must promptly initiate and complete corrective actions 

according to the OM&M plan and the owner or operator must resume 

EPA Method 22 testing of that source on a daily basis until no 

VE are observed in 30 consecutive daily tests, at which time the 

owner or operator may again decrease the frequency of EPA Method 

22 testing to a weekly basis. 

For a stand-alone FF, we are requiring that the owner or 

operator use a BLD system or monitor VE as described above to 

demonstrate parametric compliance. 

For a wet scrubber, we are requiring that the owner or 

operator continuously maintain the 3-hour block averages for 

scrubber pressure drop, scrubber liquid pH, scrubber liquid flow 

rate and chemical addition rate (if applicable) at or above the 

minimum values established during the applicable performance 

test. Maintaining the 3-hour block average for scrubber pressure 

drop at or above the minimum value established during the PM 

performance test demonstrates compliance with the PM emission 

limit. Maintaining the 3-hour block average for scrubber liquid 

pH and chemical (e.g., lime, caustic) addition rate at or above 

the minimum values established during the HF/HCl performance 

test demonstrates compliance with the acid gas (HF/HCl) HBEL. 
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Maintaining the 3-hour block average for scrubber liquid flow 

rate at or above the lowest minimum value established during the 

PM and HF/HCl performance tests demonstrates compliance with all 

applicable emission limits by showing that the scrubber is in 

proper working order. 

For an ACI system, we are requiring that the owner or 

operator demonstrate compliance with the Hg and dioxin/furan 

emission limits by continuously monitoring the activated carbon 

flow rate and maintaining it at or above the lowest minimum 

value established during the Hg and dioxin/furan performance 

tests. 

If the owner or operator intends to comply with the 

dioxin/furan emission limit without an ACI system, we are 

requiring that the owner or operator demonstrate compliance by 

continuously monitoring the peak temperature of the tunnel or 

roller kiln and the operating temperature of the ceramic tile 

spray dryer and floor tile press dryer and maintaining it at or 

above the average temperature during the dioxin/furan 

performance test for the tunnel or roller kiln and ceramic tile 

spray dryer and at or below the average temperature during the 

dioxin/furan performance test for the floor tile press dryer. 

For a water curtain on a spray glazing operation, we are 

requiring that the owner or operator demonstrate compliance with 
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the PM emission limit by conducting a daily inspection to verify 

the presence of water flow to the wet control system, conducting 

weekly visual inspections of the system ductwork and control 

equipment for leaks and conducting annual inspections of the 

interior of the control equipment (if applicable) to determine 

the structural integrity and condition of the control equipment. 

For baffles on a spray glazing operation, we are requiring 

that the owner or operator demonstrate compliance with the PM 

emission limit by conducting an annual visual inspection of the 

baffles to confirm the baffles are in place. 

For a source with no APCD, we are requiring that, to 

demonstrate compliance with the PM emission limit, the owner or 

operator monitor VE as described above. We are also requiring 

that, to demonstrate compliance with the dioxin/furan emission 

limit, the owner or operator continuously monitor the peak 

temperature of the tunnel or roller kiln and operating 

temperature of the ceramic tile spray dryer and floor tile press 

dryer; determine and record 3-hour block averages; and maintain 

the 3-hour block averages at or above the average temperature 

during the dioxin/furan performance test for the tunnel or 

roller kiln and ceramic tile spray dryer and at or below the 

average temperature during the dioxin/furan performance test for 

the floor tile press dryer. In addition, if the last calculated 
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total facility maximum potential HCl-equivalent was not at or 

below the HBEL for acid gases, then we are requiring that the 

owner or operator collect and record data documenting the 

process rate of the tunnel or roller kiln and reduce the data to 

3-hour block averages. The owner or operator must maintain the 

kiln process rate(s) at or below the kiln process rate operating 

limit(s) that enables the total facility maximum potential HClequivalent to remain at or below the HBEL. 

7. What are the notification, recordkeeping and reporting 

requirements? 

All new and existing sources are required to comply with 

certain requirements of the General Provisions (40 CFR part 63, 

subpart A), which are identified in Table 11 of subpart KKKKK. 

The General Provisions include specific requirements for 

notifications, recordkeeping and reporting. 

Each owner or operator is required to submit a notification 

of compliance status report, as required by 40 CFR 63.9(h) of 

the General Provisions. This final Clay Ceramics Manufacturing 

NESHAP requires the owner or operator to include in the 

notification of compliance status report certifications of 

compliance with rule requirements. Semiannual compliance 

reports, as required by 40 CFR 63.10(e)(3) of subpart A, are 

also required for each semiannual reporting period. 
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This final Clay Ceramics Manufacturing NESHAP requires 

records to demonstrate compliance with each emission limit and 

work practice standard. These recordkeeping requirements are 

specified directly in the General Provisions to 40 CFR part 63 

and are identified in Table 9 of subpart KKKKK. 

Specifically, we are requiring that the owner or operator 

must keep the following records: 

 All reports and notifications submitted to comply with this 

final Clay Ceramics Manufacturing NESHAP. 

 Records of performance tests. 

 Records relating to APCD maintenance and documentation of 

approved routine control device maintenance exemption. 

 Continuous monitoring data as required in this final Clay 

Ceramics Manufacturing NESHAP. 

 Records of BLD system alarms and corrective actions taken. 

 Each instance in which the owner or operator did not meet 

each emission limit (i.e., deviations from operating 

limits). 

 Records of production rates. 

 Records of approved alternative monitoring or testing 

procedures. 

 Records of maintenance and inspections performed on the 

APCD. 

 Current copies of the OM&M plan and records documenting 

conformance. 

 Logs of the information required to document compliance 

with the shuttle kiln work practice standard. 

 Logs of the information required to document compliance 

with the startup and shutdown work practice standards. 

 Records of each malfunction and the corrective action 

taken. 

 Records of parameters and procedures followed for work 

practice standards. 
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We are also requiring that the owner or operator submit the 

following reports and notifications: 

 Notifications required by the General Provisions. 

 Initial Notification no later than 120 calendar days after 

the affected source becomes subject to this subpart. 

 Notification of Intent to conduct performance tests and/or 

other compliance demonstration at least 60 calendar days 

before the performance test and/or other compliance 

demonstration is scheduled. 

 Notification of Compliance Status 60 calendar days 

following completion of a compliance demonstration that 

includes a performance test. 

 Notification of Compliance Status 30 calendar days 

following completion of a compliance demonstration that 

does not include a performance test (i.e., compliance 

demonstration for the work practice standard). 

 Compliance reports semi-annually, including a report of 

each malfunction resulting in an exceedance and the 

corrective action taken. 

 Report of alternative fuel use within 10 working days after 

terminating use of the alternative fuel. 

 Results of each performance test within 60 calendar days of 

completing the test, submitted to the EPA by direct 

computer-to-computer electronic transfer via EPA-provided 

software for data collected using supported test methods 

(see section III.E of this preamble for more information). 

C. What are the requirements during periods of startup, 

shutdown, and malfunction? 

In its 2008 decision in Sierra Club v. EPA, 551 F.3d 1019 

(D.C. Cir. 2008), the United States Court of Appeals for the 

District of Columbia Circuit vacated portions of two provisions 

in the EPA’s CAA section 112 regulations governing the emissions 

of HAP during periods of SSM. Specifically, the Court vacated 

the SSM exemption contained in 40 CFR 63.6(f)(1) and 40 CFR 
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63.6(h)(1), holding that under section 302(k) of the CAA, 

emissions standards or limitations must be continuous in nature 

and that the SSM exemption violates the CAA’s requirement that 

some section 112 standards apply continuously. 

1. Periods of Startup or Shutdown 

Consistent with Sierra Club v. EPA, the EPA has established 

standards in this rule that apply at all times. In establishing 

the standards in this rule, the EPA has taken into account 

startup and shutdown periods and, for the reasons explained in 

the preamble to the proposed rule and in sections IV.A.4 and 

IV.B.2 of this preamble, has established alternate standards for 

those periods. 

a. BSCP Manufacturing 

The EPA is issuing the work practice standards described in 

this paragraph for periods of startup and shutdown for BSCP 

tunnel kilns with APCD. As a first step, the owner or operator 

is required to determine the APCD minimum inlet temperature and 

the startup kiln car push rate of the product. For startup, the 

owner or operator is required to vent the exhaust from the kiln 

through the APCD at all times when the exhaust temperature is at 

or above the minimum inlet temperature. In addition, the owner 

or operator may not exceed the startup kiln car push rate until 

the kiln exhaust is vented to the APCD. For shutdown, the owner 
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or operator is required to vent the exhaust from the kiln 

through the APCD until the kiln exhaust temperature falls below 

the APCD minimum inlet temperature. In addition, the kiln car 

push rate is to be steadily decreased to zero as the kiln cools. 

No additional loaded kiln cars may be introduced into the kiln 

once the kiln exhaust temperature falls below the APCD minimum 

inlet temperature. When the kiln exhaust is being vented through 

the APCD, the owner or operator is required to comply with the 

applicable continuous compliance requirements described in 

section III.A.6 of this preamble. 

The EPA is issuing similar work practice standards for 

periods of startup and shutdown for BSCP tunnel kilns without an 

APCD as well. As a first step, the owner or operator is required 

to determine the product-specific kiln temperature profile and 

the startup kiln car push rate of the product. For startup, the 

startup kiln car push rate may not be exceeded until the kiln 

reaches the product-specific kiln temperature profile. For 

shutdown, the kiln car push rate is to be steadily decreased to 

zero as the kiln cools. No additional loaded kiln cars may be 

introduced into the kiln once the kiln falls below the productspecific kiln temperature profile. When the kiln production rate 

is greater than the startup kiln car push rate, the owner or 

operator is required to comply with the applicable continuous 
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compliance requirements described in section III.A.6 of this 

preamble. 

b. Clay Ceramics Manufacturing 

The EPA is issuing the work practice standards described in 

this paragraph for periods of startup and shutdown for ceramic 

tile roller kilns, floor tile press dryers, ceramic tile spray 

dryers and sanitaryware tunnel kilns with APCD. As a first step, 

the owner or operator is required to determine the APCD minimum 

inlet temperature and the startup production rate of the 

product. For startup, the owner or operator is required to vent 

the exhaust from the kiln or dryer through the APCD at all times 

when the exhaust temperature is at or above the minimum inlet 

temperature. In addition, the owner or operator may not exceed 

the startup production rate of the product until the kiln or 

dryer exhaust is being vented through the APCD. For shutdown, 

the owner or operator is required to vent the exhaust from the 

kiln or dryer through the APCD until the exhaust temperature 

falls below the APCD minimum inlet temperature. In addition, the 

production rate is to be steadily decreased to zero as the kiln 

or dryer cools. No additional throughput may be introduced to 

the kiln, press dryer and spray dryer once the exhaust 

temperature falls below the APCD minimum inlet temperature. When 

the exhaust is being vented through the APCD, the owner or 
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operator is required to comply with the applicable continuous 

compliance requirements described in section III.B.6 of this 

preamble. 

The EPA is also issuing work practice standards for periods 

of startup and shutdown for ceramic tile roller kilns, floor 

tile press dryers, ceramic tile spray dryers and sanitaryware 

tunnel kilns without an APCD. As a first step, the owner or 

operator is required to determine the product-specific kiln or 

dryer temperature profile and the startup production rate of the 

product. For startup, the startup production rate may not be 

exceeded until the kiln or dryer exhaust temperature reaches the 

product-specific temperature profile. For shutdown, the 

production rate is to be steadily decreased to zero as the kiln 

or dryer cools. No additional throughput may be introduced to 

the kiln, press dryer and spray dryer once the kiln, press dryer 

or spray dryer falls below the product-specific temperature 

profile. When the kiln or dryer production rate is greater than 

the startup production rate, the owner or operator is required 

to comply with the applicable continuous compliance requirements 

described in section III.B.6 of this preamble. 

2. Periods of Malfunction 

Periods of startup, normal operations, and shutdown are all 

predictable and routine aspects of a source’s operations. 
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Malfunctions, in contrast, are neither predictable nor routine. 

Instead they are by definition sudden, infrequent and not 

reasonably preventable failures of emissions control, process or 

monitoring equipment. (40 CFR 63.2) (Definition of malfunction). 

The EPA interprets CAA section 112 as not requiring emissions 

that occur during periods of malfunction to be factored into 

development of CAA section 112 standards. Under section 112, 

emissions standards for new sources must be no less stringent 

than the level “achieved” by the best controlled similar source 

and for existing sources generally must be no less stringent 

than the average emission limitation “achieved” by the best 

performing 12 percent of sources in the category. There is 

nothing in CAA section 112 that directs the agency to consider 

malfunctions in determining the level “achieved” by the best 

performing sources when setting emission standards. As the D.C. 

Circuit has recognized, the phrase “average emissions limitation 

achieved by the best performing 12 percent of” sources “says 

nothing about how the performance of the best units is to be 

calculated.” Nat’l Ass’n of Clean Water Agencies v. EPA, 734 

F.3d 1115, 1141 (D.C. Cir. 2013). While the EPA accounts for 

variability in setting emissions standards, nothing in CAA 

section 112 requires the agency to consider malfunctions as part 

of that analysis. A malfunction should not be treated in the 
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same manner as the type of variation in performance that occurs 

during routine operations of a source. A malfunction is a 

failure of the source to perform in a “normal or usual manner” 

and no statutory language compels the EPA to consider such 

events in setting section CAA 112 standards. 

Further, accounting for malfunctions in setting emission 

standards would be difficult, if not impossible, given the 

myriad different types of malfunctions that can occur across all 

sources in the category and given the difficulties associated 

with predicting or accounting for the frequency, degree, and 

duration of various malfunctions that might occur. As such, the 

performance of units that are malfunctioning is not “reasonably” 

foreseeable. See, e.g., Sierra Club v. EPA, 167 F.3d 658, 662 

(D.C. Cir. 1999) (“The EPA typically has wide latitude in 

determining the extent of data-gathering necessary to solve a 

problem. We generally defer to an agency’s decision to proceed 

on the basis of imperfect scientific information, rather than to 

‘invest the resources to conduct the perfect study.’”) See also, 

Weyerhaeuser v. Costle, 590 F.2d 1011, 1058 (D.C. Cir. 1978) 

(“In the nature of things, no general limit, individual permit, 

or even any upset provision can anticipate all upset situations. 

After a certain point, the transgression of regulatory limits 

caused by ‘uncontrollable acts of third parties,’ such as 
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strikes, sabotage, operator intoxication or insanity, and a 

variety of other eventualities, must be a matter for the 

administrative exercise of case-by-case enforcement discretion, 

not for specification in advance by regulation.”). In addition, 

emissions during a malfunction event can be significantly higher 

than emissions at any other time of source operation. For 

example, if an APCD with 99-percent removal goes off-line as a 

result of a malfunction (as might happen if, for example, the 

bags in a baghouse catch fire) and the emission unit is a steady 

state type unit that would take days to shut down, the source 

would go from 99-percent control to zero control until the APCD 

was repaired. The source’s emissions during the malfunction 

would be 100 times higher than during normal operations. As a 

result, the emissions over a 4-day malfunction period would 

exceed the annual emissions of the source during normal 

operations. As this example illustrates, accounting for 

malfunctions could lead to standards that are not reflective of 

(and significantly less stringent than) levels that are achieved 

by a well-performing non-malfunctioning source. It is reasonable 

to interpret CAA section 112 to avoid such a result. The EPA’s 

approach to malfunctions is consistent with CAA section 112 and 

is a reasonable interpretation of the statute. 
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In the event that a source fails to comply with the 

applicable CAA section 112(d) standards as a result of a 

malfunction event, the EPA would determine an appropriate 

response based on, among other things, the good faith efforts of 

the source to minimize emissions during malfunction periods, 

including preventative and corrective actions, as well as root 

cause analyses to ascertain and rectify excess emissions. The 

EPA would also consider whether the source’s failure to comply 

with the CAA section 112(d) standard was, in fact, sudden, 

infrequent, not reasonably preventable and was not instead 

caused in part by poor maintenance or careless operation. 40 CFR 

63.2 (definition of malfunction). 

If the EPA determines in a particular case that an 

enforcement action against a source for violation of an emission 

standard is warranted, the source can raise any and all defenses 

in that enforcement action and the federal district court will 

determine what, if any, relief is appropriate. The same is true 

for citizen enforcement actions. Similarly, the presiding 

officer in an administrative proceeding can consider any defense 

raised and determine whether administrative penalties are 

appropriate. 

In summary, the EPA interpretation of the CAA and, in 

particular, section 112 is reasonable and encourages practices 
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that will avoid malfunctions. Administrative and judicial 

procedures for addressing exceedances of the standards fully 

recognize that violations may occur despite good faith efforts 

to comply and can accommodate those situations. 

D. What are the effective and compliance dates of the standards? 

The NESHAP for BSCP Manufacturing and Clay Ceramics 

Manufacturing are effective on [insert 60 days from date of 

publication in the Federal Register]. 

If the initial startup of the affected source is after 

December 18, 2014, but before [insert date 60 days from date of 

publication in the Federal Register], then the compliance date 

is no later than [insert date 60 days from date of publication 

in the Federal Register]. If the initial startup of the affected 

source is after [insert date 60 days from date of publication in 

the Federal Register], then the compliance date is immediately 

upon initial startup of the affected source. The compliance date 

for existing affected sources is no later than [insert date 3 

years and 60 days from date of publication in the Federal 

Register]. 

The initial performance test must be conducted within 180 

calendar days after the compliance date specified in 40 CFR 

63.8395 for BSCP affected sources and 40 CFR 63.8545 for clay 

ceramics affected sources, according to the provisions in 40 CFR 
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60.7(a)(2). The first of the 5-year repeat tests must be 

conducted no later than 5 years following the initial 

performance test, and thereafter within 5 years from the date of 

the previous performance test. The date to submit performance 

test data through the Electronic Reporting Tool (ERT) is within 

60 calendar days after the date of completing each performance 

test. 

E. What are the requirements for submission of performance test 

data to the EPA? 

As stated in the proposed rule preamble, the EPA is taking 

a step to increase the ease and efficiency of data submittal and 

data accessibility. Specifically, the EPA is requiring owners 

and operators of BSCP and clay ceramics manufacturing facilities 

to submit electronic copies of required performance test 

reports. 

As mentioned in the preamble of the proposal, data will be 

collected by direct computer-to-computer electronic transfer 

using EPA-provided software. As discussed in the proposal, the 

EPA-provided software is an electronic performance test report 

tool called the ERT. The ERT will generate an electronic report 

package that will be submitted to the Compliance and Emissions 

Data Reporting Interface (CEDRI) and then archived to the EPA’s 

Central Data Exchange (CDX). A description and instructions for 
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use of the ERT can be found at 

http://www.epa.gov/ttn/chief/ert/index.html, and CEDRI can be 

accessed through the CDX Web site at www.epa.gov/cdx. 

The requirement to submit performance test data 

electronically to the EPA does not create any additional 

performance testing and will apply only to those performance 

tests conducted using test methods that are supported by the 

ERT. A listing of the pollutants and test methods supported by 

the ERT is available at the ERT Web site. The EPA believes, 

through this approach, industry will save time in the 

performance test submittal process. Additionally, this 

rulemaking benefits industry by cutting back on recordkeeping 

costs as the performance test reports that are submitted to the 

EPA using CEDRI are no longer required to be kept in hard copy. 

As mentioned in the proposed preamble, air agencies will 

benefit from more streamlined and accurate review of performance 

test data that will be available on the EPA WebFIRE database. 

The public will also benefit. Having these data publicly 

available enhances transparency and accountability. For a more 

thorough discussion of electronic reporting of performance tests 

using direct computer-to-computer electronic transfer and using 

EPA-provided software, see the discussion in the preamble of the 

proposal. 
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In summary, in addition to supporting regulation 

development, control strategy development and other air 

pollution control activities, having an electronic database 

populated with performance test data will save industry, air 

agencies, and the EPA significant time, money, and effort while 

improving the quality of emission inventories, air quality 

regulations, and enhancing the public’s access to this important 

information. 

F. What materials are being incorporated by reference under 1 

CFR part 51? 

In this final rule, the EPA is including regulatory text 

that includes incorporation by reference. In accordance with 

requirements of 1 CFR 51.5, the EPA is incorporating by 

reference the following documents described in the amendments to 

40 CFR 63.14: 

 ANSI/ASME PTC 19.10–1981, Flue and Exhaust Gas Analyses 

[Part 10, Instruments and Apparatus], (Issued August 31, 

1981). 

 ASTM D6348-03 (Reapproved 2010), Standard Test Method for 

Determination of Gaseous Compounds by Extractive Direct 

Interface Fourier Transform Infrared (FTIR) Spectroscopy, 

including Annexes A1 through A8, (Approved October 1, 

2010). 

 ASTM D6784-02 (Reapproved 2008), Standard Test Method for 

Elemental, Oxidized, Particle-Bound and Total Mercury in 

Flue Gas Generated from Coal-Fired Stationary Sources 

(Ontario Hydro Method), (Approved April 1, 2008). 

 ASTM D6735-01 (Reapproved 2009), Standard Test Method for 

Measurement of Gaseous Chlorides and Fluorides from Mineral 

Calcining Exhaust Sources—Impinger Method. 
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 EPA-454/R-98-015, Office of Air Quality Planning and 

Standards (OAQPS), Fabric Filter Bag Leak Detection 

Guidance, September 1997. 

The EPA has made, and will continue to make, these 

documents generally available electronically through 

www.regulations.gov and/or in hard copy at the appropriate EPA 

office (see the ADDRESSES section of this preamble for more 

information). 

IV. Summary of Significant Changes Following Proposal and 

Rationale 

The following sections summarize the significant changes 

made to the proposed BSCP Manufacturing NESHAP and Clay Ceramics 

Manufacturing NESHAP, including the rationale for those changes, 

to respond to public comments and to correct technical 

inconsistencies or editorial errors in the proposal. A detailed 

discussion of these and other public comments can be found in 

the response-to-comments documents, available in Docket ID No. 

EPA-HQ-OAR-2013-0291 for BSCP Manufacturing and Docket ID No. 

EPA-HQ-OAR-2013-0290 for Clay Ceramics Manufacturing. 

A. What are the significant changes since proposal for the BSCP 

Manufacturing NESHAP? 

1. Changes to the Data Set 

Following proposal, the EPA learned that two of the 

facilities in the inventory at proposal were closed and the 
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kilns were demolished. In addition, the EPA learned that two of 

the synthetic area sources in the inventory at proposal were 

actually true area sources. These facilities were removed from 

the master inventory, and the test data from kilns at two of 

these facilities were also removed from the data set. The EPA 

learned that a new tunnel kiln had been constructed at a new 

facility, and that new facility was added to the inventory. The 

EPA also received additional HF, HCl, and PM test data for three 

kilns, which was added into the data set. 

In addition, the EPA examined the PM test data more closely 

and found that a number of the EPA Method 5 test runs had probe 

or filter temperatures outside of the range of acceptable 

values. EPA Method 5 specifies that the temperature should be 

maintained at 248 ± 25 degrees Fahrenheit (°F) (i.e., between 

223 and 273 °F). Test runs with temperatures outside that range 

were removed from the data set. (See the memorandum “Test Data 

Used in BSCP Final Rule” in Docket ID No. EPA-HQ-OAR-2013-0291 

for more information on this analysis.) 

Several public commenters stated that the concentration 

limits for PM and Hg should not be corrected to 7 percent O2

because BSCP kilns operate with a higher oxygen content; one 

commenter suggested that the EPA use data corrected to 17 

percent O2 instead. The EPA evaluated this comment and agrees 
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that 17 percent O2 is more representative of BSCP kiln 

operations. Specifically, the EPA evaluated the oxygen content 

of the run-by-run datasets of PM and Hg for BSCP tunnel kilns 

and found that for the PM data set, the oxygen content ranged 

from 9.5 to 20.5 percent, with an average of 16.8 and a mode of 

17 when evaluating the run-by-run O2 values rounded to whole 

numbers. For the Hg data set, the oxygen content ranged from 

13.1 to 19.5 percent, with an average of 17.2 and a mode of 17 

when evaluating the run-by-run O2 values rounded to whole 

numbers. The EPA agrees that correcting concentration data to 17 

percent O2 rather than 7 percent, as proposed, provides more 

representative values of kilns’ operating conditions and would 

not artificially inflate the values. Therefore, the EPA 

recalculated the oxygen-corrected PM and Hg test runs to be 

corrected to 17 percent instead of 7 percent O2. 

2. Changes to the MACT Floor Pool and Calculations 

At proposal, the MACT floors for PM as a surrogate for 

total non-Hg HAP metals were based on kilns with FF-based APCD, 

as the EPA considered those to be the best performing sources in 

the industry. However, as noted in section IV.A.1 of this 

preamble, the EPA examined the PM test data more closely 

following proposal and found that a number of the EPA Method 5 

test runs had probe or filter temperatures outside of the range 
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of acceptable values. These out-of-range temperatures 

invalidated the test runs, and in some cases, invalidated entire 

PM tests, reducing the set of valid, available test data. Some 

of the PM test data removed from the data set were for kilns 

controlled with a DIFF. As a result, the EPA no longer has data 

on all the kilns with a FF-based APCD in the industry, the best 

performing kilns for which to set a MACT floor based on the 

entire category. Therefore, the final MACT floor pools for PM as 

a surrogate for total non-Hg HAP metals are not based on the top 

12 percent of the kilns in the industry (i.e., the 27 best 

performing sources). Instead, the final MACT floor limits are 

based on the top 12 percent of the data available in each of the 

kiln size subcategories, consistent with the approach described 

for the proposed alternate non-Hg HAP metals standards in 

section IV.Q.1 of the preamble to the proposed rule (79 FR 

75649). 

In addition, in response to public comments received on the 

proposed rule, and consistent with the proposed alternate 

approach in section IV.Q.1 of the preamble to the proposed rule, 

the EPA has decided to exercise its discretion to subcategorize 

for emissions of PM based on kiln size in the final rule. 

Section 112(d)(1) of the CAA allows the EPA to promulgate 

emission standards for either categories or subcategories of 
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sources. Section IV.C of the preamble to the proposed rule (79 

FR 75633) described the EPA’s assessment of tunnel kiln size 

subcategories. When the EPA recalculated the MACT floor pools 

for PM as a surrogate for total non-Hg HAP metals as described 

in the previous paragraph, the EPA evaluated subcategorizing by 

kiln size and determined it is appropriate to exercise its 

discretion to subcategorize in this case. This subcategorization 

provides additional flexibility for small tunnel kilns, many of 

which are operated by small businesses. Therefore, the final 

MACT floor limits for PM as a surrogate for total non-Hg HAP 

metals are based on the best performing 12 percent of the 

sources in each of the kiln size subcategories with valid test 

data (i.e., 12 percent of the data available). 

The EPA also proposed two alternative equivalent limits, 

calculated based on the same best performing sources ranked by 

lb/ton, then using those units’ concentration or lb/hr data to 

calculate the floor. During the public comment period, the EPA 

received comments that each alternative limit should be 

calculated according to a separate ranking based on the specific 

unit of measure. Upon further analysis of the data sets for each 

unit of measure, the EPA has found that there are some 

differences in the top ranked sources between each unit of 

measure data set and thus finds the alternative limits expressed 
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on their own unit of measure data set ranking to be the most 

indicative of that data set’s MACT floor. Therefore, the EPA reranked the data for each unit of measurement in each kiln size 

subcategory separately. The final alternative equivalent limits 

are based on the top 12 percent of the data available in each 

subcategory according to these revised rankings. In other words, 

the concentration floor is based on the ranking of the 

concentration data, and the lb/hr floor is based on the ranking 

of the lb/hr data. Each floor is based on the best performing 

units for that unit of measurement. In addition, the final lb/hr 

non-Hg HAP metals alternative limit is based on a ranking of the 

non-Hg HAP metals data rather than the use of conversion factors 

applied to the PM lb/ton floor limit, as was done at proposal. 

3. Variability Calculation Based on Hg Raw Material Data 

At proposal, the EPA developed Hg MACT floors based on the 

best performing 12 percent of sources (i.e., the lowest emitting 

sources of Hg emissions from test data). However, commenters 

identified that the Hg comes from the raw materials used and the 

Hg content can vary by location, even within the same quarry. 

The EPA did not account for this inherent variability at 

proposal. The Brick Industry Association (BIA) coordinated with 

several BSCP facilities to test the Hg content of the raw 

materials used and provided the data to the EPA. The EPA mapped 
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the facilities and quarry locations provided by BIA to identify 

two distinct quarry locations, an OK deposit and an OH deposit, 

for use in the development of a Hg raw material variability 

factor. The data from these two deposit locations were 

incorporated into the upper prediction limit (UPL) equation. 

Please see “Mercury Content of Oklahoma and Ohio Shale Deposits 

Supplying the Brick Industry” and “Final Maximum Achievable 

Control Technology (MACT) Floor Analysis for Brick and 

Structural Clay Products” in Docket ID No. EPA-HQ-OAR-2013-0291 

for more information about the data and variability factor. 

4. Startup and Shutdown Procedures 

The EPA proposed work practice standards during periods of 

startup and shutdown for tunnel kilns with and without APCD. 

These standards set a minimum temperature above which the 

exhaust must be vented through an APCD (if applicable) and below 

which no product could be introduced to the kiln (400 °F for 

startup and 300 °F for shutdown). Industry commenters indicated 

that the exhaust of some kilns never reaches the specific 

temperatures proposed by the EPA, and that some product must be 

introduced to the kiln during startup to heat the kiln enough 

for full production. The EPA evaluated these comments and agrees 

that the proposed standards do not actually represent the work 

practices representative of the best performing kilns. The 
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intent of the proposed standards was to represent work practices 

of the best performing kilns to minimize emissions by limiting 

the amount of brick being fired before the kiln reaches full 

production and limiting the amount of time the exhaust is not 

being routed to the APCD, if applicable. As noted at proposal, 

the standards were based on information received through the 

2010 EPA survey. The EPA received additional information 

following proposal on the procedures used during periods of 

startup and shutdown for BSCP tunnel kilns that are more 

representative of the best performing kilns. 

Therefore, the EPA is finalizing work practice standards 

for periods of startup and shutdown that are based upon the same 

principles as the proposed standards but are representative of 

how kilns actually perform during startup. Instead of defining 

the minimum inlet APCD temperature as 400 °F, the EPA is 

requiring the owner or operator to determine the minimum inlet 

temperature for each APCD. If a kiln does not have an APCD, the 

owner or operator is required to determine the product-specific 

kiln temperature profile that must be achieved before the kiln 

can reach full production. In addition, instead of specifying 

that no product can be introduced to the kiln during startup, 

the EPA is requiring the owner or operator to determine the 

production rate needed to start up the kiln. The final startup 
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standards specify that this startup production rate cannot be 

exceeded until the kiln exhaust reaches the APCD minimum inlet 

temperature or the product-specific kiln temperature profile. 

The final shutdown standards specify that no additional product 

can be introduced once the kiln exhaust falls below the APCD 

minimum inlet temperature or the product-specific kiln 

temperature profile. 

B. What are the significant changes since proposal for the Clay 

Ceramics Manufacturing NESHAP? 

1. Changes to the Data Set 

After proposal, a public commenter identified a 

transcription error in the production rate for the PM and Hg 

stack tests for one floor tile roller kiln. The production rate 

was corrected, and the PM and Hg lb/ton values were 

recalculated. In addition, the EPA examined the PM test data 

more closely and found that a number of the EPA Method 5 test 

runs had probe or filter temperatures outside of the range of 

acceptable values. EPA Method 5 specifies that the temperature 

should be maintained at 248 ± 25 °F (i.e., between 223 and 273 

°F). Test runs with temperatures outside that range were removed 

from the data set. (See the memorandum “Test Data Used in Clay 

Ceramics Final Rule” in Docket ID No. EPA-HQ-OAR-2013-0290 for 

more information on this analysis.) 
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During the public comment period, the sanitaryware 

manufacturing company that provided all of the data used for the 

sanitaryware tunnel kiln MACT floors clarified that the 

production rates they provided in their section 114 survey 

response are in terms of “greenware fired” into the kiln rather 

than “fired product” coming out of the kiln (as requested in the 

section 114 survey). Therefore, to be consistent with the data, 

the final emission limits for PM as a surrogate for non-Hg HAP 

metals and Hg from sanitaryware tunnel kilns are in terms of 

lb/ton of greenware fired rather than lb/ton of product fired 

(as proposed). 

Finally, in response to comments requesting a change in the 

format of the emission limits for dioxins/furans, the EPA 

recalculated the emissions for each test run in units of ng/kg 

of throughput (specifically, “fired product” for ceramic tile 

roller kilns, “greenware fired” for sanitaryware tunnel kilns, 

and “throughput processed” for ceramic tile press dryers and 

spray dryers). The MACT floors were then recalculated using 

those data, and the final emission limits for dioxins/furans for 

clay ceramics sources are in units of ng/kg rather than 

concentration as proposed. 
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2. Startup and Shutdown Procedures 

The EPA proposed work practice standards during periods of 

startup and shutdown for ceramic tile roller kilns, floor tile 

press dryers, ceramic tile spray dryers and sanitaryware tunnel 

kilns with and without APCD. These standards set a minimum 

temperature above which the exhaust must be vented through an 

APCD (if applicable) and below which no product could be 

introduced to the kiln or dryer (400 °F for startup and 300 °F 

for shutdown). One industry commenter indicated that the exhaust 

of some dryers never reach the specific temperatures proposed by 

the EPA. The EPA evaluated the comment and agrees that the 

proposed standards are not actually representative of the best 

performing dryers. 

Therefore, the EPA is finalizing work practice standards 

for periods of startup and shutdown that are based upon the same 

principles as the proposed standards but more accurately reflect 

the best performing sources. Instead of defining the minimum 

inlet APCD temperature as 400 °F, the EPA is requiring the owner 

or operator to determine the minimum inlet temperature for each 

APCD. If a kiln or dryer does not have an APCD, the owner or 

operator is required to determine the product-specific kiln or 

dryer temperature profile that must be achieved before the kiln 

or dryer can reach full production. In addition, instead of 
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specifying that no product can be introduced to the kiln or 

dryer, the EPA is requiring the owner or operator to determine 

the production rate needed to start up the kiln or dryer. The 

final startup standards specify that this startup production 

rate cannot be exceeded until the kiln or dryer exhaust reaches 

the APCD minimum inlet temperature or the product-specific kiln 

or dryer temperature profile. The final shutdown standards 

specify that no additional throughput can be introduced once the 

kiln or dryer exhaust falls below the APCD minimum inlet 

temperature or the product-specific kiln or dryer temperature 

profile. 

V. Summary of Significant Comments and Responses 

The EPA received a total of 52 public comment letters on 

the proposed BSCP Manufacturing NESHAP. (See Docket ID No. EPA–

HQ–OAR–2013–0291 for the complete public comments.) The EPA 

received a total of seven public comment letters on the proposed 

Clay Ceramics Manufacturing NESHAP. (See Docket ID No. EPA–HQ–

OAR–2013–0290 for the complete public comments.) The following 

sections summarize the major public comments received on the 

proposal and present the EPA’s responses to those comments. 

A. Health-Based Standards 

Comment: Two commenters disagreed with setting standards 

under CAA section 112(d)(4) for emissions of HCl, HF, and Cl2
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from new and existing BSCP and clay ceramics sources. One 

commenter questioned whether the EPA has the authority to set 

CAA section 112(d)(4) standards for these acid gases. The 

commenter asserted that it would be arbitrary and capricious for 

the EPA to set risk-based standards for these pollutants when 

the EPA previously decided not to set CAA section 112(d)(4) 

standards for HCl, HF, and Cl2 in air toxics rulemakings for 

industrial boilers and power plants. For power plants, the EPA 

stated that the agency “does not have sufficient information to 

establish CAA section 112(d)(4) health-based emission standards 

and we did not receive such data during the comment period.”1 The 

commenter noted that the EPA reached a similar conclusion with 

respect to industrial boilers, declining to set risk-based 

standards because of a lack of information on emissions.2 The 

commenter asserted that the health and scientific data regarding 

emissions of acid gases from BSCP and clay ceramics plants 

similarly fail to provide justification for setting HBEL for 

these pollutants. The commenter asserted the EPA must instead 

set MACT standards. 

 

1 “Responses to Public Comments on National Emission Standards for Hazardous 

Air Pollutants from Coal- and Oil-Fired Electric Utility Steam Generating 

Units.” Docket Item No. EPA-HQ-OAR-2009-0234-20126. 

2 National Emission Standards for Hazardous Air Pollutants for Major Sources: 

Industrial, Commercial, and Institutional Boilers and Process Heaters, 75 FR 

32006, 32031 (June 4, 2010). 
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Similarly, the second commenter expressed concern over 

using CAA section 112(d)(4) and health-based risk assessment for 

setting the HCl, HF and Cl2 standards for BSCP Manufacturing and 

Clay Ceramics Manufacturing. The commenter noted that this would 

be the first time the EPA used the health-based risk assessment 

approach under CAA section 112(d)(4) to set emission standards 

for HF and Cl2; although the EPA has used this approach in the 

past to establish health-based standards for other source 

categories, it was restricted to “HCl emissions for discrete 

units within the facility” (79 FR 75639). 

The commenter supported focusing on pollutants that pose 

the greatest risks but expressed concern that the EPA has not 

adequately established that the approaches used are appropriate. 

The commenter asserted that the EPA’s approach represented a 

far-reaching and significant change in the manner in which MACT 

standards are established under CAA section 112(d) and that it 

was inappropriate for the EPA to propose such changes in a 

rulemaking for individual source categories instead of 

discussing the approach with all affected parties. The commenter 

noted that Congress established section 112 of the CAA to rely 

on a technology-based approach to avoid the gridlock of the 

unsuccessful risk-based methods used before the adoption of the 

1990 CAA Amendments. Accordingly, while the CAA includes 
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language under section 112(d)(4) allowing the use of risk in the 

establishment of MACT, it should be used only under limited and 

very specific circumstances, and the commenter stated that the 

EPA’s proposal did not adequately make the case for the use of 

CAA section 112(d)(4). 

Conversely, two other commenters stated that the EPA has 

clear legal authority to set HBEL and ample justification to do 

so for the BSCP source category. The commenters stated that 

under the terms of this provision, the EPA may set an emission 

standard at a level higher than would be required by CAA section 

112(d)(4), provided that: (1) the pollutant(s) being regulated 

is a threshold pollutant and (2) the standard provides an ample 

margin of safety. The commenters stated that both of these 

criteria are met in this case. 

The commenters asserted that the proposed standard is 

consistent with Congress’s expectations regarding the 

implementation of CAA section 112(d)(4). According to the Senate 

report accompanying the legislation, “For some pollutants a MACT 

emission limitation may be far more stringent than is necessary 

to protect public health and the environment” and in such 

situations, “[t]o avoid expenditures by regulated entities which 

secure no public health or environmental benefit, the 

Administrator is given discretionary authority to consider the 
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evidence for a health threshold higher than MACT at the time the 

standard is under review.”3 The commenters stated that for this 

rulemaking, MACT would result in emission standards that are far 

more stringent than are needed to protect health and the 

environment and asserted that Congress enacted CAA section 

112(d)(4) to allow emission standards to be tailored to protect 

public health without imposing unreasonable and unnecessary 

standards on affected sources. 

Response: The EPA disagrees with the commenters that we do 

not have the authority to establish CAA section 112(d)(4) 

standards in this rulemaking. The EPA also disagrees that the 

decision to establish CAA section 112(d)(4) standards is 

inconsistent with our decisions on other rulemakings. The 

commenters’ more detailed arguments and the EPA’s responses are 

provided in the remainder of this section. 

1. Health Thresholds 

Comment: One commenter stated that a pollutant is not a 

threshold pollutant under CAA section 112(d)(4) unless the EPA 

establishes that it cannot cause cancer at any level of 

exposure. The commenter asserted that HCl, HF, and Cl2 do not 

have already-established safe health thresholds and the EPA’s 

 

3 S. Rep. No. 101-228, 101st Cong. 1st sess. at 171. 
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proposed standards would not provide “an ample margin of 

safety.” 

Conversely, two commenters agreed with the EPA that the 

available health data indicate that HCl, HF, and Cl2 are all 

threshold pollutants. The commenters stated that the data show 

that each of these pollutants has a discernible exposure 

threshold below which adverse human health effects are not 

expected to occur; in addition, none of the available data 

suggest that these pollutants reasonably should be expected to 

act as a carcinogen or mutagen, or exhibit a mode of action that 

would result in non-threshold effects. 

Response: The EPA disagrees with the first commenter 

regarding HCl, HF and Cl2 not having thresholds accepted by the 

scientific community, and we acknowledge the support of the 

other two commenters. The EPA’s conclusion that HCl, HF and Cl2

are threshold pollutants is based on the best available toxicity 

database considered in hazard identification and dose response 

assessments. There is agreement on using a similar threshold 

approach for these chemicals across agencies, i.e., the EPA’s 

Integrated Risk Information System (IRIS) Program, Agency for 

Toxic Substances and Disease Registry (ATSDR) and the California 

Environmental Protection Agency (CalEPA). The toxicity 

assessments, which include noncancer and/or cancer toxicity 
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assessments, provided by these authoritative bodies are widely 

vetted through the scientific community and undergo rigorous 

peer review processes before they are published. In addition, 

the Science Advisory Board (SAB) has endorsed the use of the 

reference values derived by these sources to support the EPA’s 

risk assessments in the residual risk and technology review 

(RTR) program. 

Specifically, none of the compounds discussed here has been 

classified as a carcinogen or as “suggestive of the potential to 

be carcinogenic,” individually or in combination, by existing 

authoritative bodies, including EPA, CalEPA, International 

Agency for Research on Cancer (IARC), Organisation for Economic 

Co-operation and Development (OECD), and the European Community. 

In light of the absence of evidence of carcinogenic risk for any 

of these pollutants, and the evidence of an existing threshold 

below which HCl, HF and Cl2 are not expected to cause adverse 

effects, the EPA considers it appropriate to set health 

threshold standards under CAA section 112(d)(4) for these 

pollutants. The existing health effects evidence on HCl, HF and 

Cl2 that provide support for this determination is described 

below. 

Potential health effects of HCl: 

 There is equivocal evidence of the carcinogenic potential 

of HCl in humans. The occupational data are limited to a 
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couple of studies (Steenland et. al., 1988, Beaumont et. 

al., 1986)4,5 where the subjects were exposed to a mixture 

of acid gases (mainly sulfuric acid) and other chemicals 

(including metals) that may have contained HCl. 

 Chronic inhalation studies in animals have reported no 

carcinogenic responses after chronic exposure to HCl 

(Albert et al, 1982; Sellakumar et al., 1985).6,7

 Hydrogen chloride has not been demonstrated to be 

genotoxic. The genotoxicity database is largely negative 

including two studies of the effects of pH on in vitro 

genetic test assays that reported false positive results 

potentially associated with low pH in the test system 

(Morita et. al., 1992; Cifone et al., 1987).8,9

 Chronic exposure to HCl at concentrations below the current 

IRIS reference concentration (RfC) are not expected to 

cause adverse effects. 

Potential health effects of HF: 

 There are a limited number of studies investigating the 

carcinogenic potential of HF. These studies are of 

questionable relevance to the issue of possible 

carcinogenicity of HF and/or fluorides, in general, because 

there are many confounding factors (e.g., exposure to 

multiple unknown chemicals and smoking habits not accounted 

for) and because no breakdown was done by type of fluoride 

exposure.10

 

4 Steenland, K., T. Schnorr, J. Beaumont, W. Halperin, T. Bloom. 1988. 

Incidence of laryngeal cancer and exposure to acid mists. Br. J. of Ind. Med. 

45: 766-776. 

5 Beaumont, J.J., J. Leveton, K. Knox, T. Bloom, T. McQuiston, M Young, R. 

Goldsmith, N.K. Steenland, D. Brown, W.E. Halperin. 1987. Lung cancer 

mortality in workers exposed to sulfuric acid mist and other acid mists. 

JNCI. 79: 911-921 

6 Albert, R.E., A.R. Sellakumar, S. Laskin, M. Kuschner, N. Nelson and C.A. 

Snyder. 1982. Gaseous formaldehyde and hydrogen chloride induction of nasal 

cancer in rats. J. Natl. Cancer Inst. 68(4): 597-603. 

7 Sellakumar, A.R., C.A. Snyder, J.J. Solomon and R.E. Albert. 1985. 

Carcinogenicity for formaldehyde and hydrogen chloride in rats. Toxicol. 

Appl. Pharmacol. 81: 401-406. 

8 Morita, T., T. Nagaki., I. Fukuda, K. Okumura. 1992. Clastogenicity of low 

pH to various cultured mammalian cells. Mutat. Res. 268: 297-305. 

9 Cifone, M.A., B. Myhr, A. Eiche, G. Bolcsfoldi. 1987. Effect of pH shifts on 

the mutant frequency at the thymidine kinase locus in mouse lymphoma L5178Y 

TK=/- cells. Mutat. Res. 189: 39-46 

10 US Department of Health and Human Services, Agency for Toxic Sunstances and 

Disease Registry. Toxicological Profile for Fluorides, Hydrogen Fluoride and 
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 Respiratory tract effects of HF are likely similar to those 

observed after exposure to hydrogen bromide and HCl 

(Stavert et al., 1991).11

 Chronic exposure at or below the current CalEPA REL is not 

expected to cause adverse effects. 

Potential health effects of Cl2: 

 The existing studies of workers in the chemical industry 

have not found any evidence that Cl2 is carcinogenic. 

 Chronic bioassays in rodents and long-term studies in nonhuman primates have shown no evidence for carcinogenicity 

in respiratory tract as target tissue or other tissues. 

 Chronic exposure to Cl2 at concentrations below the current 

ATSDR minimal risk level (MRL) are not expected to cause 

adverse effects. 

We disagree with the comment that the EPA’s proposed HBEL 

does not provide an ample margin of safety. 

The limit is based on the facility in the source category 

with the highest potential exposure to nearby residents. The 

HBEL at this single facility reflects a ratio of exposure 

concentration over the reference value of up to 1. As such, 

exposures will not exceed the established health threshold. In 

addition, the exposure estimate used to set the limit is very 

health protective in that it assumes constant exposure for 70 

years. Actual exposures are expected to be lower, (i.e., time 

away from home). This conservative exposure scenario is 

 

Fluorine. 2003. Available at http://www.atsdr.cdc.gov/toxprofiles/tp11.pdf. 

11 Stavert, D.M., Archuleta D.C., Behr M.J., Lehnert, B.E. Relative acute 

toxicities of hydrogen fluoride, hydrogen chloride, and hydrogen bromide in 

nose- and pseudo-mouth-breathing rats. Fundam Appl Toxicol. 16: 636-655. 
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consistent with the ‘ample margin of safety’ requirement in 

section 112(d)(4). Further, the ratios at most other facilities 

from this source category are significantly lower, with 

approximately 90 percent of these facilities having a ratio of 

0.5 or less, which provides an increased margin of safety. 

Comment: One commenter stated that, according to the EPA, 

an RfC is merely “an estimate (with uncertainty spanning perhaps 

an order of magnitude)” of an exposure that is “likely to be” 

without health risks.12 By definition, this “estimate” is not by 

itself a “safe threshold” of exposure that “presents no risk” of 

adverse health effects. The commenter stated the EPA cannot 

lawfully use a pollutant’s RfC as a default “safe threshold” 

under CAA section 112(d)(4) because an RfC does not pose “no” 

health risks, as the commenter asserted the CAA requires. 

The commenter stated that the EPA is authorized to set 

risk-based standards only where it has direct evidence of the 

level at which there are no adverse effects observed and that 

proceeding with HBEL without a no observed adverse effect level 

(NOAEL) is unlawful. Another commenter stated the use of healthbased standards should only be considered for HAP that have been 

thoroughly evaluated by the EPA and are contained in the IRIS 

 

12 EPA, Glossary, http://www.epa.gov/risk_assessment/glossary.htm (last 

updated Apr. 28, 2014) 
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database with a high level of confidence in the RfC. With 

respect to HCl, the IRIS confidence levels are “Low” for the 

inhalation RfC. In “Carcinogenicity Assessment for Lifetime 

Exposure,” IRIS states, “This substance/agent has not undergone 

a complete evaluation and determination under the EPA’s IRIS 

program for evidence of human carcinogenic potential.”13 In the 

proposal, the EPA acknowledged that “[t]he EPA has not 

classified HCl for carcinogenicity” and “[l]ittle research has 

been conducted on its carcinogenicity” (79 FR 75639). 

The commenter also stated that IARC concluded that “[t]here 

is inadequate evidence for the carcinogenicity in humans of 

hydrochloric acid,” that “[t]here is inadequate evidence for the 

carcinogenicity in experimental animals of hydrochloric acid,” 

and that HCl “is not classifiable as to its carcinogenicity to 

humans.”14 The commenter stated that the EPA did not identify any 

evidence that HCl is not carcinogenic and noted that the only 

study the EPA referenced is “one occupational study” that “found 

no evidence of carcinogenicity” (79 FR 75639). Because the EPA 

did not provide a citation for the study or otherwise identify 

it or discuss it, the public are unable to adequately comment on 

it. 

 

13 http://www.epa.gov/iris/subst/0396.htm#coninhal 

14 IARC, Hydrochloric Acid (Monograph), available at 

http://monographs.iarc.fr/ENG/Monographs/vol54/mono54-8.pdf 
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Response: The EPA’s risk assessments are supported by the 

best available toxicity assessments from authoritative bodies 

including the EPA’s IRIS Program, ATSDR and CalEPA. The SAB has 

endorsed the use of the reference values derived by these 

sources to support EPA’s risk assessments in the RTR program. 

These authoritative bodies derive health protective reference 

values at or below which no adverse effects are expected to 

occur. As mentioned previously in this section, the toxicity 

assessments, which include noncancer and/or cancer toxicity 

assessments, provided by these authoritative bodies are widely 

vetted through the scientific community and undergo rigorous 

peer review processes before they are published. 

The commenter stated that there is not a NOAEL and that 

based on that, the EPA cannot set a HBEL for HCl. The EPA 

toxicity assessments consider the entire toxicity database for 

specific chemicals and are conducted following well-established 

EPA guidance on how to assess potential hazard of a chemical and 

conduct dose response assessments. These assessments include the 

derivation of a RfC, which is likely to be without appreciable 

risk of adverse health effects to the human population 

(including susceptible subgroups and all life stages) over a 

lifetime. According to EPA guidelines, RfCs can be derived from 

a NOAEL, lowest observed adverse effect level (LOAEL) or 
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benchmark dose, with uncertainty factors applied to reflect the 

limitations of the data used. In particular for HCl, the point 

of departure for the RfC (15 milligrams per cubic meter (mg/m3)) 

was selected from chronic inhalation studies in rodents and was 

adjusted to reflect a lifetime of exposure (2.7 mg/m3) and 

extrapolated to a human equivalent concentration (6.1 mg/m3) 

based on differences in the effects of a gas in the respiratory 

system between rats and humans. Uncertainty factors (total of 

300, yielding an RfC of 0.02 mg/m3) were applied to account for 

interspecies differences, intraspecies extrapolation and 

extrapolation from a LOAEL to NOAEL. It is important to note 

that in the IRIS assessment for HCl it is stated that a 

reasonable estimate of the NOAEL in humans is in the range of 

0.3-3 mg/m3. This estimate resulted from an expert review 

workshop and is based on examination of the HCl literature, a 

comparison with sulfuric acid toxicity, and the judgment of 

those in attendance at the review workshop. In addition, this 

value is generally consistent with identified NOAELs in 

subchronic animal studies (OECD, 2002). Based on this 

information, we are confident that the IRIS HCl RfC represents a 

conservative health protective benchmark below which adverse 

health effects are not expected to occur. 
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As part of the risk analysis conducted to support this 

rule, the EPA thoroughly evaluated all the available and 

relevant scientific evidence on HCl (discussed previously in 

this section) and concluded that there is no evidence that HCl 

is a carcinogen and that this information is sufficient for this 

regulatory determination. The 2002 OECD assessment of HCl drew 

similar conclusions: 

For genetic toxicity, a negative result has been shown in 

the Ames test. A positive result in a chromosome aberration 

test using Hamster ovary cells is considered to be an 

artifact due to the low pH. For carcinogenicity, no preneoplastic or neoplastic nasal lesions were observed in a 

128-week inhalation study with SD male rats at 10 ppm 

hydrogen chloride gas. No evidence of treatment related 

carcinogenicity was observed in other animal studies 

performed by inhalation, oral or dermal administration. In 

humans, no association between hydrogen chloride exposure 

and tumor incidence was observed.15

Additionally, the EPA conducted a screening level literature 

review in 2003 and did not identify any critical studies that 

would change the conclusions in the 1995 HCl IRIS assessment. 

Based on the information available, the EPA concludes that this 

information is sufficient to support setting a HBEL under CAA 

section 112(d)(4) for HCl. 

Comment: One commenter stated that the EPA proposed to base 

the HCl emission standards on the HCl RfC and argued it is 

unlawful to do so where the EPA has “low confidence” in the RfC. 

 

15 UNEP 2002, http://www.inchem.org/documents/sids/sids/7647010.pdf. 
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The commenter stated that it is arbitrary to claim there is an 

established, safe health threshold based on a reference value in 

which the EPA has low confidence. According to the commenter, 

having low confidence in the RfC is the same as admitting that 

the EPA has “low confidence” in the proposed emission standards. 

The fact that the EPA was unable to determine a no-effect level 

in a robust and reliable scientific study demonstrates concern 

that chronic exposure to even very low levels of HCl can 

compromise health, especially in sensitive subpopulations. 

Therefore, the EPA cannot state that HCl presents no risk of 

adverse health effects. 

The commenter stated that the EPA used a non-cancer health 

threshold for HCl based on a chronic inhalation study on rats.16

The EPA has determined the RfC to be 0.02 mg/m3 (0.0134 part per 

million (ppm)), based on rat studies by Albert, et al. 

demonstrating hyperplasia of the nasal mucosa (the protective 

cell lining of the nasal tract and cavities), larynx, and 

trachea.17 The commenter asserted that because these rat studies 

failed to identify a NOAEL, the EPA based the RfC on a LOAEL 

(i.e., the lowest dose in the study that induced a measurable 

adverse health effect in treated animals). The commenter 

 

16 EPA, Integrated Risk Information System: Hydrogen Chloride 

17 Albert, R.E., et al., Gaseous formaldehyde and hydrogen chloride induction 

of nasal cancer in rats, 68(4) J. Natl. Cancer Inst. 597 (1982). 
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asserted that CAA section 112(d)(4) does not permit risk-based 

standards where a NOAEL has not been determined; at a minimum, 

Congress required that a threshold be based on the “‘no 

observable [adverse] effects level’ (NOAEL) below which human 

exposure is presumably ‘safe.’”18 The EPA has similarly 

recognized that “the legislative history of CAA section 

112(d)(4) indicates that a health-based emission limit under CAA 

section 112(d)(4) should be set at the level at which no 

observable effects occur” (79 FR 75642). The commenter stated 

that, if there is no established non-zero threshold level at 

which it has been shown that the pollutant has no deleterious 

health effects, then the EPA cannot be certain that exposure to 

the pollutant at a given level presents no harm. The commenter 

stated that without a NOAEL, no established threshold can exist, 

and the EPA does not have the authority under CAA section 

112(d)(4) to set a HBEL for HCl. 

Response: The EPA’s chemical-specific toxicity assessments 

are derived using the EPA’s risk assessment guidelines and 

approaches that are well established and vetted through the 

scientific community, and follow rigorous peer review 

processes.19 The RTR program gives preference to EPA values 

 

18 S. Rep. No. 101-228, at 171, 176. 

19 Integrated Risk Information System (IRIS). IRIS Guidance documents 

available at http://www.epa.gov/iris/backgrd.html. 
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(i.e., RfCs for noncancer assessments) for use in risk 

assessments and uses other values, as appropriate, when those 

values are derived with methods and peer review processes 

consistent with those followed by the EPA. The approach for 

selecting appropriate toxicity values for use in the RTR Program 

has been endorsed by the SAB.20

The EPA’s RfCs are assigned confidence levels of high, 

medium and low based on the completeness of the supporting 

database. High confidence RfCs are considered less likely to 

change substantially with the collection of additional 

information, while low confidence RfCs may be vulnerable to 

change.21 It is important to note that, for a given chemical, if 

there are not adequate or appropriate data with which to derive 

an RfC, one is not calculated. All RfCs, even those with low 

confidence, are appropriate for regulatory use. 

We disagree with the comment that without a NOAEL, no 

established threshold can exist. The EPA toxicity assessments 

for specific chemicals are conducted using well-established EPA 

guidance on how to assess potential hazard of chemicals and how 

to conduct dose response assessments to arrive at a chemical 

 

20 http://www.epa.gov/ttn/atw/nata1999/99pdfs/healtheffectsinfo.pdf. 

21 US EPA Air: Fate, Exposure, and Risk Analysis Website. Air Toxics 

Assessment Reference Library. 2004. Available at 

http://www2.epa.gov/sites/production/files/2013-

08/documents/volume_1_reflibrary.pdf. 
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concentration below which we do not expect adverse effects to 

occur (i.e., threshold). These assessments include the 

derivation of a RfC which is likely to be without appreciable 

risk of adverse health effects to the human population 

(including susceptible subgroups and all life stages [e.g., 

children]) over a lifetime. According to EPA guidelines, RfCs 

can be derived from a NOAEL, LOAEL or benchmark dose, with 

uncertainty factors applied to account for relevant 

extrapolations, including extrapolation from LOAEL to NOAEL, and 

to reflect additional limitations of the data used.22,23

Comment: One commenter stated that the studies the EPA 

relied upon only investigated respiratory effects and did not 

consider other ways HCl could cause harm. The commenter noted 

the EPA has acknowledged that the RfC is an “inhalation RfC” and 

represents the health risk and toxicity associated with the 

inhalation pathway of exposure only (75 FR 32031). The commenter 

stated that the EPA identified no studies that indicate whether 

exposure to HCl - at 0.02 mg/m3 or any other concentration - 

harms other bodily systems. 

 

22 U.S. EPA. 1994. Methods for Derivation of Inhalation Reference 

Concentrations and Application of Inhalation Dosimetry. EPA/600/8-90/066F, 

Oct 1994. 

23 U.S. EPA. 2002. A Review of the Reference Dose and Reference Concentration 

Processes. EPA/630/P-02/002F, Dec 2002. 
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Response: The EPA disagrees with the comment that the 

agency investigated only respiratory effects and that it did not 

consider other ways in which HCl can cause harm. In the 

principal studies upon which the RfC is based, a complete 

necropsy was performed on all animals. Histologic sections were 

prepared from the nasal cavity, lung, trachea, larynx, liver, 

kidneys, testes, and other organs where gross pathological signs 

were present. Due to the reactive nature of HCl, however, portal 

of entry effects are anticipated to occur first and at lower 

exposure concentrations. The IRIS assessment24 for HCl included a 

comprehensive review of all the available toxicity data for HCl. 

No effects are expected to occur at exposures of HCl at or below 

the level of the RfC. 

Comment: One commenter stated that the RfC is an inadequate 

basis for establishing a threshold because it “did not reflect 

any potential cumulative or synergistic effects of an 

individual’s exposure to multiple HAP or to a combination of HAP 

and criteria pollutants” and noted that the EPA recognized the 

potential for cumulative and synergistic effects was important 

in its consideration of risk-based standards in two recent 

rulemakings (see 75 FR 32031 and 76 FR 25050). 

 

24 IRIS Summary for Hydrogen Chloride. http://www.epa.gov/iris/subst/0396.htm 

(Accessed on July 24, 2015) 
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The commenter stated that there is no “established” 

threshold at the RfC for HCl, because the CalEPA has determined 

a lower and more health-protective value than the RfC. The EPA’s 

chronic inhalation RfC is 0.02 mg/m3, while California’s chronic 

inhalation reference exposure level (REL) is 0.009 mg/m3.25 The 

commenter stated that CalEPA’s REL is based on the same science 

as the IRIS RfC but was developed more recently than the EPA’s 

RfC, which was last revised in 1995.26 The REL is “the 

concentration level at or below which no health effects are 

anticipated in the general human population,” and the EPA’s 

process for developing RELs “is similar to that used by EPA to 

develop IRIS values and incorporates significant external 

scientific peer review.”27 The commenter asserted that the EPA 

and CalEPA disagree about the concentration of HCl exposure at 

which no health effects are expected and that the disagreement 

stems from how to account for uncertainty and variability in 

interpreting the study results. 

 

25 California Office of Environmental Health Hazard Assessment (OEHHA), OEHHA 

Acute, 8-Hour and Chronic Reference Exposure Levels (REL)s, 

http://www.oehha.ca.gov/air/Allrels.html (last accessed Mar. 12, 2015). 

26 California OEHHA, Chronic RELs and Toxicity Summaries Using the Previous 

Version of the Hot Spots Risk Assessment Guidelines at 311 (1999), available 

at http://oehha.ca.gov/air/hot_spots/2008/AppendixD3_final.pdf. 

27 EPA, Risk Assessment to Determine a Health-Based Emission Limitation for 

Acid Gases for the Brick and Structural Clay Products Manufacturing Source 

Category, May 19, 2014, Docket Item No. EPA-HQ-OAR-2013-0291-0132. 
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The fact that two agencies have determined significantly 

different “safe” levels, the commenter contended, demonstrates 

as a matter of law that there is no “established” health 

threshold for HCl and precludes the EPA from lawfully setting 

CAA section 112(d)(4) standards for HCl. The commenter stated 

that the statute requires that a health threshold “has been 

established” and argued the legislative history indicates 

Congress intended for CAA section 112(d)(4) limits to be used 

only where there was a “well-established” level that presents 

“no risk” of adverse effects and about which there was no 

“dispute.”28 The commenter asserted that Congress did not grant 

the Administrator the authority to establish the threshold 

itself and that the EPA does not have authority to set CAA 

section 112(d)(4) standards in situations where there is 

disagreement among expert agencies as to what the correct health 

threshold should be. 

The commenter asserted that by failing to address the 

CalEPA REL, the EPA contravened its obligation under 

administrative law to address significant evidence that detracts 

from the agency’s conclusion. The commenter stated that for the 

EPA to rely solely on the IRIS RfC, the EPA would need to 

explain why the CalEPA REL is incorrect and why the IRIS RfC 

 

28 S. Rep. No. 101-228, at 171. 
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reflects the best available science and risk assessment 

practices, particularly when the IRIS RfC and CalEPA REL 

thresholds are based on the same science and when the EPA relied 

upon CalEPA RELs at several other points in its proposal (e.g., 

the EPA used the CalEPA REL for acute inhalation exposure to HCl 

as the basis for its CAA section 112(d)(4) standards). If the 

EPA considers CalEPA’s acute REL for HCl to reflect a reliable 

value, then the commenter stated it is arbitrary to disregard 

CalEPA’s chronic REL for HCl. The commenter further noted the 

EPA relied upon the CalEPA chronic REL for HF in order to 

determine a threshold for HF and argued that using the CalEPA 

REL for HF but not for HCl is arbitrary. 

Response: At an initial point, with respect to the comment 

that different agencies have identified different thresholds and 

so “as a matter of law” there is no “established” health 

threshold for HCl, the EPA disagrees that the phrase “has been 

established” in CAA section 112(d)(4) means that there is 

universal agreement on the health threshold level and that 

differences between CalEPA and the EPA demonstrate that no 

health threshold “has been established.” The statute does not 

clearly identify who must establish the health threshold or how 

such threshold should be established. In the absence of such 

specificity in the statute, the EPA reads CAA section 112(d)(4) 
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to authorize the EPA to set health-based limits where, in the 

EPA's expert judgment, there is a health threshold for the 

pollutant below which no adverse health effects are expected to 

occur. 

Further, we disagree with the comment that there is no 

established threshold at the RfC because CalEPA developed a 

reference value at a lower concentration than the RfC. The 

approaches used by both agencies are similar and assume a 

threshold below which adverse health effects would not be 

expected; however, there are some differences between agencies 

in methods for deriving the estimate for a threshold that may 

affect the final resulting values. Both agencies use the best 

available science to support their risk assessments. The EPA has 

an approach for selecting appropriate health benchmark values 

and, in general, this approach places greater weight on the EPA 

derived health benchmarks than those from other agencies.29 The 

approach favoring EPA benchmarks (when they exist) has been 

endorsed by the SAB30 and ensures use of values most consistent 

with well-established and scientifically-based EPA science 

policy. 

 

29 http://www.epa.gov/ttn/atw/nata1999/99pdfs/healtheffectsinfo.pdf 

30 The SAB peer review of RTR Risk Assessment Methodologies is available at: 

http://yosemite.epa.gov/sab/sabproduct.nsf/4AB3966E263D943A8525771F00668381/$

File/EPA-SAB-10-007-unsigned.pdf 
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Specifically for HCl, we selected the IRIS RfC for HCl as 

the most appropriate chronic noncancer health threshold to use 

for this rule. In the case of HF, there is not an EPA RfC 

available and the only chronic reference value from an 

authoritative source and appropriate for use in this rule is the 

California REL. 

Comment: Several commenters disagreed with the EPA’s 

decision to set a HBEL for HF. These commenters contended the 

EPA does not have the authority to set HF standards under CAA 

section 112(d)(4) because the scientific data supporting the 

EPA’s findings regarding the carcinogenic potential of HF are 

insufficient and unreliable. Three commenters asserted that the 

EPA should not adopt HBEL for HF due to uncertainty about the 

vulnerabilities of children, infants, and fetuses to HF 

exposures at the REL concentration used by the EPA to set the HF 

emissions standards. Two commenters noted that the proposal 

states, “There is limited/equivocal evidence of the carcinogenic 

potential of HF” (79 FR 75641) and “[t]he EPA has not classified 

HF for carcinogenicity” (79 FR 75640) and questioned how the 

agency could be confident that HF is eligible to be a threshold 

pollutant if its status as a non-carcinogen is uncertain. 

One commenter noted that the EPA failed to identify an 

established, well-defined health-based threshold, below which HF 
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does not cause cancer, that is based on reliable science and has 

a high level of certainty. The EPA has stated that 

“carcinogenicity via inhalation of fluoride is not considered to 

be likely by most investigators reporting in the existing 

literature” (79 FR 75641) and that the EPA “has not classified 

HF for carcinogenicity” (79 FR 75640). The commenter stated that 

it is possible that HF causes cancer because increased rates of 

cancer have been observed in workers exposed to a mixture of 

chemicals that included fluoride31 and noted that the EPA 

acknowledged data suggesting that those with occupational 

exposure to HF have greater than normal occurrences of cancer.32

The commenter stated that, because of the data showing possible 

carcinogenic effect, as well as the data showing mutagenic 

effect in animals, the EPA does not have enough evidence to 

classify HF as a threshold pollutant with any level of 

confidence. The commenter stated that the EPA failed to explain 

how it weighed the conflicting evidence of HF’s carcinogenicity 

and considered EPA’s conclusion to be arbitrary and capricious. 

Three commenters noted that the EPA does not consider HF in its 

IRIS database but noted that HF breaks down into fluorine, which 

 

31 Gallerani, M., et al., Systemic and topical effects of intradermal 

hydrofluoric acid, 16 Am. J. Emer. Med. 521, 522 (1998). 

32 EPA, Technology Transfer Network Air Toxics Web site: Hydrogen Fluoride, 

http://www.epa.gov/ttn/atw/hlthef/hydrogen.html (last updated Oct. 18, 2013). 
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is included in IRIS.33 One commenter stated that IRIS indicates 

no data are available to determine an RfC for chronic inhalation 

exposure to fluorine.34 This commenter further noted that IARC 

“has determined that the carcinogenicity of fluoride to humans 

is not classifiable.”35 Another commenter stated that healthbased standards should be considered only for HAP that are 

contained in IRIS with a high level of confidence in the RfC. 

One commenter noted that although the National Air Toxics 

Assessment (NATA) database does not contain HF,36 the database 

does provide evidence that HF has a mutagenic effect in animals. 

This conclusion was supported by other scientific reviews37 and 

by the National Academy of Sciences (NAS), which states that 

“the overall evidence from human animal studies is mixed” on the 

question of whether fluoride is carcinogenic when inhaled.38

 

33 EPA, Integrated Risk Information System: Fluorine (Soluble Fluoride) (CASRN 

7782-41-4), http://www.epa.gov/iris/subst/0053.htm (last updated Oct. 31, 

2014). 

34 EPA, Integrated Risk Information System: Fluorine, 

http://www.epa.gov/iris/subst/0053.htm (last updated Oct. 31, 2014). 

35 ATSDR, Toxicological Profile for Fluorides, Hydrogen Fluoride, and Fluorine 

at 8. 

36 EPA, National Scale Air Toxics Assessment Overview: The 33 Pollutants, 

http://www.epa.gov/ttn/atw/nata/34poll.html (last updated Jan. 6, 2015). 

37 See, (e.g., National Research Council of the National Academies, Emergency 

and Continuous Exposure Guidance Levels for Selected Submarine Contaminants 

vol.3 at 91-92, available at 

http://www.ncbi.nlm.nih.gov/books/n/nap12741/pdf. 

38 National Research Council of the National Academies, Emergency and 

Continuous Exposure Guidance Levels for Selected Submarine Contaminants vol.3 

at 91-92, available at http://www.ncbi.nlm.nih.gov/books/n/nap12741/pdf. 
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Four commenters questioned the EPA’s reliance on a CalEPA 

risk assessment, noting that the CalEPA REL is based on a study 

of adults exposed to HF in the workplace39 and therefore, did not 

include any children. Two commenters stated that a 10X 

“intraspecies” factor was applied to account for variability 

among humans, but noted that CalEPA expressed concern about “the 

potentially greater susceptibility of children to the effects of 

inhaled fluorides, considering the rapid bone growth in early 

years.”40 One commenter recommended the EPA use an additional 

default factor of at least 10X to account for uncertainty 

regarding health risks to children, infants, and fetuses. The 

commenter stated that a 10X factor would be consistent with the 

NAS recommendation41 and with the 10X factor enacted by Congress 

in the Food Quality Protection Act (FQPA).42 Another commenter 

stated that recent science not considered at the time CalEPA 

adopted the REL provides further support for prior research 

showing that HF has neurodevelopmental effects on children and 

 

39 Derryberry O.M., et al., Fluoride exposure and worker health-The health 

status of workers in a fertilizer manufacturing plant in relation to fluoride 

exposure, 6 Arch. Environ. Health. 503 (1963). 

40 OEHHA Chronic RELs and Toxicity Summaries, at 280. 

41 National Research Council of the National Academies, Science and Decisions: 

Advancing Risk Assessment, at 190-93 (2009) (hereinafter “NAS, Science and 

Decisions”) 

42 21 U.S.C. 346a(b)(2)(C) (requiring that, in establishing, modifying, 

leaving in effect, or revoking a tolerance or exemption for a pesticide 

chemical residue, “for purposes of clause (ii)(I) an additional tenfold 

margin of safety for the pesticide chemical residue and other sources of 

exposure shall be applied” to protect infants and children). 
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that children living in high-fluoride areas have been observed 

to have lower IQ scores than those living in low-fluoride 

areas.43 The commenter asserted that the adverse effects of 

fluoride on children are likely to be more severe, and longlasting, compared with effects on adults. 

One commenter stated that the CalEPA REL is based on a 

study that only examined the increased bone density (skeletal 

fluorosis) endpoint and noted that CalEPA stated that “[t]he 

primary uncertainty in the study was the lack of a comprehensive 

health effects examination.”44 The commenter stated that the EPA 

does not know whether neurodevelopmental harm, or other health 

effects, are more sensitive than skeletal harm; therefore, the 

EPA cannot lawfully set a “safe” threshold at a concentration 

that poses “no risk” of health effects with “an ample margin of 

safety” based on a study that lacks “a comprehensive health 

effects examination.” 

Another commenter asserted that the EPA has insufficient 

data showing exposure to HF at the REL value “presents no risk” 

of harm to other bodily systems. The commenter noted that HF is 

 

43 See Choi, A.L., et al., Developmental Fluoride Neurotoxicity: A Systematic 

Review and Meta-Analysis, 120 Envtl. Health Perspect. 1362 (Oct. 2012), 

http://ehp.niehs.nih.gov/1104912/ (reviewing and discussing findings from 

over 20 studies); Choi, A.L., et al., Association of Lifetime Exposure to 

Fluoride and Cognitive Functions in Chinese Children: A Pilot Study, 47 

Neurotox. & Teratology 96 (Jan.-Feb. 2015). 

44 OEHHA, Chronic RELs and Toxicity Summaries, at 280. 
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a possible reproductive toxin,45 that occupational studies of 

women exposed to fluoride identified increased rates of 

menstrual irregularities,46 and that animal studies have found 

that fluoride impairs reproduction and increases the rates of 

fetal bone and teeth malformation.47 In addition, chronic 

inhalation of hydrofluoric acid can cause irritation and 

congestion of the nose and throat and bronchitis,48 and animal 

studies found increased rates of kidney and liver damage from 

hydrofluoric acid inhalation.49 Further, HF readily penetrates 

the skin, causing deep tissue layer destruction,50 and ingestion 

of HF may result in vomiting and abdominal pain, with painful 

necrotic lesions, hemorrhagic gastritis, and pancreatitis 

reported after significant exposure.51

 

45 Massachusetts Toxics Use Reduction Institute, Massachusetts Chemical Fact 

Sheet: Hydrofluoric Acid, at 1, available at 

http://www.turi.org/content/download/3663/44840/file/Fact Sheet Hydrofluoric 

Acid.pdf. 

46 EPA, Health Issue Assessment: Summary Review of Health Effects Associated 

with Hydrogen Fluoride and Related Compounds, EPA/600/8-89/002F (1988). 

47 ATSDR, Toxicological Profile for Fluorides, Hydrogen Fluoride and Fluorine; 

EPA, Health Issue Assessment: Summary Review of Health Effects Associated 

with Hydrogen Fluoride and Related Compounds. 

48 CalEPA, Technical Support Document for the Determination of Noncancer 

Chronic Reference Exposure Levels. 

49 EPA, Health Issue Assessment: Summary Review of Health Effects Associated 

with Hydrogen Fluoride and Related Compounds. 

50 Burgher, Francois, et al., Experimental 70% hydrofluoric acid burns: 

histological observations in an established human skin explants ex vivo 

model, 30.2 Cutaneous & Ocular Toxicology 100 (2011). 

51 CDC, National Institute for Occupational Safety and Health (NIOSH): 

Hydrogen Fluoride/ Hydrofluoric Acid, 

http://www.cdc.gov/niosh/ershdb/emergencyresponsecard_29750030.html. 
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The commenter stated the CalEPA REL was developed by CalEPA 

using an outdated version of CalEPA’s Hot Spots Risk Assessment 

Guidelines (1999) that has been “superseded” by the more recent 

guidelines released in February 2015.52 The commenter noted the 

1999 version required updating in part because it did not 

include sufficient consideration of “infants and children in 

assessing risks from air toxics.” 

Response: The EPA has not reviewed HF in the IRIS program. 

However, we concur with the two recent authoritative assessments 

by ATSDR (2003)53 and the European Union (2002)54 that the 

 

52 OEHHA Chronic RELs and Toxicity Summaries at 1; CalEPA, OEHHA, Air Toxics 

Hot Spots Program: Guidance Manual for Preparation of Health Risk Assessments 

(Feb. 2015), available at 

http://oehha.ca.gov/air/hot_spots/2015/2015GuidanceManual.pdf. 

53 Agency for Toxic Substance and Disease Registry (2003) - “Although elevated 

cancer rates have been reported in some occupational groups exposed to 

hydrogen fluoride and fluoride dusts, these studies were not controlled for 

the multiple substance exposures to which industrial workers are generally 

exposed. Because of these multiple exposures and the problem inherent in all 

occupational studies in identifying appropriate reference populations, only 

limited evidence from such studies is specifically relevant to the 

investigation of possible carcinogenic effects of long-term dermal exposure 

to hydrofluoric acid and inhalation exposure to hydrogen fluoride and/or 

fluoride dusts in human beings. As noted previously, IARC has determined that 

the carcinogenicity of fluoride to humans is not classifiable.” 

54 European Union Risk Assessment Report (2001) - “Carcinogenicity studies, in 

which HF has been tested, are not available. Studies with NaF may provide 

insight in the carcinogenicity of HF, especially for systemic tumours. With 

the latter substance 4 animal studies have been performed, 2 in which NaF was 

supplied in the drinking water to rats and mice, and two in which NaF was 

administered via the diet, again to rats and mice....In the rat drinking water 

study, equivocal indications for osteosarcomas in males were obtained, but 

the rat diet study was negative, despite clear indications of fluoride 

intoxication. The mouse drinking water study was also negative. The mouse 

diet study was confounded by the presence of a retrovirus which may have 

(co)-induced the growth of benign osteomas thus thwarting the interpretation 

of the study. In the diet studies (Maurer et al. 1990; Maurer et al. 1993) 

bone fluoride levels were higher than in the drinking water studies (NTP 

1990), while in the diet studies no indications for osteosarcomas were 
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available evidence does not support classifying HF as 

“Carcinogenic to Humans,” “Likely to Be Carcinogenic to Humans” 

or as having “Suggestive Evidence of Carcinogenic Potential” (US 

EPA Guidelines for Carcinogen Risk Assessment (2005)). 

All of the studies cited by the commenter are from exposure 

to fluoride and not from inhalation exposures to HF. 

Neurodevelopmental effects may be relevant to high fluoride 

exposures, but the existing evidence shows these effects may 

occur at fluoride exposure levels beyond those that would cause 

respiratory effects if HF were the sole source of exposure. In 

the study of Lund (1997),55 plasma fluoride concentrations were 

shown to increase in the nanogram per milliliter range from 

exposures to HF in the mg/m3 level (e.g., elevations of 

approximately 20 nanograms fluoride per milliliter in plasma 

resulted from 1-hour exposure to 2 mg/m3 HF, with notable 

 

obtained. Furthermore, the osteomas were considered to be reminiscent of 

hyperplasias rather than true bone neoplasms. It was concluded that the 

available data is sufficient to suggest that fluoride is not a carcinogenic 

substance in animals (Janssen and Knaap 1994)...Based on epidemiological data 

IARC (1982) concluded that the evidence for carcinogenicity of orally taken 

fluoride in humans is inadequate. Recent studies (cited in CEPA 1993; Janssen 

and Knaap 1994) did not supply evidence of a relationship between fluoride in 

drinking water and cancer mortality, either. US-EPA, reviewing the 

epidemiological data for fluoride, stated that no conclusion can be drawn as 

to the carcinogenicity of fluoride after inhalatory exposure, because in all 

studies available, humans were exposed to other substances as well (Thiessen 

1988).” 

55 Lund K, Ekstrand J, Boe J, Søstrand P, and Kongerud J. (1997) Exposure to 

hydrogen fluoride: an experimental study in humans of concentrations of 

fluoride in plasma, symptoms, and lung function. Occup Environ Med. 54(1):32-

37. 
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respiratory and eye irritation effects). Reproductive and 

developmental effects in rats have been noted from experiments56

with plasma F levels in the 150 ng/ml range maintained for over 

4 months. The primary issue in causing neurodevelopmental 

effects (which have yet to be quantified) is likely associated 

with aggregate and cumulative exposure from multiple sources of 

fluorides (e.g., water, food, toothpaste) which are greater 

contributors to total fluoride body burden and uncontrollable 

variables in establishing this rule, which deals with exposures 

to HF only. 

The EPA also disagrees with the comment that a children’s 

default safety factor of 10 should be added to the CalEPA REL 

for HF. In response to the 10X factor enacted by Congress in the 

FQPA (1996)57 to the EPA non-cancer reference value derivation, 

the agency evaluated its methods for considering children’s risk 

in the development of reference values. As part of its response, 

the EPA (i.e., the Science Policy Council and Risk Assessment 

Forum) established the RfD/RfC Technical Panel to develop a 

strategy for implementing the FQPA and examine the issues 

 

56 Oencue, M; Kocak, A; Karaoz, E; Darici, H; Savilk, E; and Gultekin, F 

(2007) Effect of long-term fluoride exposure on lipid peroxidation and 

histology of testes in first- and second-generation rats. Biological Trace 

Element Research 118:260-268. 

57 US Environmental Protection Agency, Pesticide: Regulating Pesticides. The 

Food Quality Protection Act (FQPA). 1996. Available at 

http://www.epa.gov/pesticides/regulating/laws/fqpa/backgrnd.htm. 
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relative to protecting children’s health and application of the 

10X safety factor. One of the outcomes of the Technical Panel’s 

efforts was an in depth review of a number of issues related to 

the RfD/RfC process (U.S. EPA 2002). The most critical aspect in 

the derivation of a reference value pertaining to the FQPA has 

to do with variation between individual humans and is accounted 

for by a default uncertainty factor when no chemical-specific 

data are available. The EPA reviewed the default UF for interhuman variability and found the EPA’s default value of 10 

adequate for all susceptible populations and lifestages, 

including children and infants. The EPA also recommends the use 

of chemical-specific data in preference to default uncertainty 

factors when available (US EPA, 1994, 2011)58 and is developing 

Agency guidance to facilitate consistency in the development and 

use of data-derived extrapolation factors for RfCs and reference 

doses (RfDs) (U.S. EPA, 2011).59 In agreement with the 

recommendations of the RfC review, CalEPA chronic REL for HF was 

derived using an inter-individual uncertainty factor of 10, 

which is considered adequate by the EPA for accounting for all 

 

58 U.S. EPA (1994). Methods for derivation of inhalation reference 

concentrations and application of inhalation dosimetry. (EPA/600/8-90/066F). 

Research Triangle Park, NC. 

http://cfpub.epa.gov/ncea/cfm/recordisplay.cfm?deid=71993 

59 U.S. EPA (2011) External Review Draft of Guidance for Applying Quantitative 

Data to Develop Data-Derived Extrapolation Factors for Interspecies and 

Intraspecies Extrapolation http://www.epa.gov/raf/DDEF/index.htm 
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susceptible populations and lifestages, including children and 

infants. 

Regarding the comment that CalEPA’s Hot Spots Risk 

Assessment Guidelines (1999) have been “superseded” by the more 

recent guidelines released in February 2015, the EPA reviewed 

the February 2015 Guidelines information provided by the 

commenter and concluded that this information does not include 

methods for conducting hazard identification and dose response 

assessments, which are the analyses that preclude the derivation 

of a reference value. Therefore, the information provided by the 

commenter does not apply to the CalEPA REL derivation methods. 

The commenter’s assertion that the NATA database does not 

contain HF is incorrect; NATA 2005 (cited above by the 

commenter) does include noncancer risk estimates for HF. The HF 

cancer risks are not included in NATA because a quantitative 

cancer analysis for HF does not exist. 

Comment: Several commenters disagreed with the EPA’s 

decision to set a HBEL for Cl2 and stated the EPA does not have 

the authority to set Cl2 standards under CAA section 112(d)(4) 

because the EPA does not have reliable scientific data 

demonstrating a “safe” threshold for Cl2 and has not demonstrated 

Cl2 presents no cancer risk. Two commenters noted that in the 

proposal, the EPA stated that, “the agency presumptively 
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considers Cl2 to be a threshold pollutant.” The commenters 

asserted that a presumption is not adequate for EPA to justify 

setting a health-based standard for Cl2 under CAA section 

112(d)(4). 

One commenter stated that it is possible that Cl2 is 

carcinogenic and noted that Cl2 has not undergone a complete 

evaluation and determination of human carcinogenic potential 

under the IRIS program.60 The IARC and the Department of Health 

and Human Services (DHHS) have not classified Cl2 gas for human 

carcinogenicity. The commenter stated that the absence of data 

showing carcinogenicity is not the same as data demonstrating 

that a substance is not carcinogenic. 

According to the commenter, Congress authorized CAA section 

112(d)(4) standards only where a threshold “has been 

established.” In other words, there must be an alreadyestablished threshold for which there is direct evidence that 

the pollutant presents “no” harm at the threshold level of 

exposure, and the law requires “well-established” factual 

evidence.61 The commenter asserted that the EPA is not authorized 

to set risk-based standards based on a “presumption” of the 

existence of a safe level of exposure and that by doing so, the 

 

60 EPA, Integrated Risk Information System: Chlorine, 

http://www.epa.gov/iris/subst/0405.htm (last updated Oct. 31, 2014). 

61 S. Rep. No. 101-228, at 171. 
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EPA would violate the law and fail to ensure adequate protection 

from the health risks of hazardous pollution. 

The commenter stated that the EPA cannot set a health 

threshold for Cl2 based on a chronic inhalation study on monkeys 

because that study did not determine a NOAEL. The commenter 

asserted that CAA section 112(d)(4) does not permit risk-based 

standards where a NOAEL has not been determined. The commenter 

stated that, at a minimum, Congress required that a threshold be 

based on the “‘no observable [adverse] effects level’ (NOAEL) 

below which human exposure is presumably ‘safe.’”62 If there is 

no established non-zero “threshold” level at which it has been 

shown that the pollutant has no deleterious health effects, then 

the commenter asserted that the EPA cannot be certain that 

exposure to the pollutant at a given level presents “no” harm. 

Two commenters stated that IRIS contains “no data” on a RfC 

for chronic inhalation exposure.63 The ATSDR MRL on which the 

proposed Cl2 threshold is based is a “screening value[] only” and 

“[is] not [an] indicator[] of health effects.”64 According to the 

ATSDR, “Exposures to substances at doses above MRLs will not 

necessarily cause adverse health effects and should be further 

 

62 S. Rep. No. 101-228, at 171, 176. 

63 EPA, Integrated Risk Information System: Chlorine. 

64 ATSDR, Public Health Assessment Guidance Manual (2005 Update): Appendix F, 

http://www.atsdr.cdc.gov/hac/PHAManual/appf.html (last updated Nov. 30, 

2005). 
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evaluated,” “MRLs are intended to serve only as a screening tool 

to help you decide if you should more closely evaluate exposures 

to a substance found at a site,” and “uncertainties are 

associated with [the] techniques” used to derive MRLs.65 

One commenter stated that the MRL does not account for the 

potentially greater susceptibility of children, infants, and 

fetuses to Cl2 exposures66 and noted that CalEPA has recognized 

that Cl2 is a toxic air contaminant “that may disproportionately 

impact infants and children” because it can exacerbate asthma.67

Therefore, the commenter asserted the MRL does not reflect an 

“established” safe health threshold at which exposure presents 

“no” adverse effects and that it is unlawful for the EPA to set 

CAA section 112(d)(4) standards for Cl2. 

Response: The EPA disagrees with the comment. As part of 

the risk analysis conducted to support this rule, the EPA 

thoroughly evaluated all the available and relevant scientific 

evidence on Cl2 (as discussed in detail previously in this 

section) and concluded that there is no evidence that Cl2 is a 

carcinogen and that this information is sufficient to support 

 

65 ATSDR, Toxicological Profile for Chlorine, at 14 

66 ATSDR, Toxicological Profile for Chlorine at 20-21 (observing that a value 

similar to the MRL could be calculated using the lowest observed adverse 

effect level (LOAEL) approach if an uncertainty factor of only 3 for human 

variability is used and no child-safety uncertainty factor is used) 

67 CalEPA, Prioritization of Toxic Air Contaminants Under the Children’s 

Environmental Health Protection Act, at 27-28. 
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this regulatory decision. The MRL for Cl2 was developed using the 

benchmark dose analysis method, which has been widely adopted 

across the risk assessment community and by the EPA’s Risk 

Assessment Forum68 as a more reliable estimate of a threshold for 

an effect than a NOAEL or LOAEL. As a result, the REL for Cl2

does define a threshold. 

Regarding the assertion that the MRL does not take into 

consideration the potential for greater potential effects in 

children, in the development of the Toxicological Profile for 

Chlorine,69 ATSDR performed an exhaustive review of all of the 

relevant health effects data available at the time. Until new 

information becomes available, the Cl2 MRL is the most credible, 

scientifically grounded toxicity assessment for Cl2 and the most 

appropriate reference value to use in this regulatory action. 

In the light of the absence of evidence of carcinogenic 

risk from Cl2 exposure and the evidence of an existing threshold 

below which Cl2 is not expected to cause adverse effects, the EPA 

considers it appropriate to set health threshold standards under 

CAA section 112(d)(4) for Cl2. 

 

68 US EPA (2012) Benchmark Dose Technical Guidance. Risk Assessment Forum, 

Washington, DC 20460. EPA/100/R-12/001, June 2012. Available online at 

http://www2.epa.gov/sites/production/files/2015-

01/documents/benchmark_dose_guidance.pdf. 

69 Agency for Toxic Substances and Disease Registry (ATSDR). 2010. 

Toxicological profile for Chlorine. Atlanta, GA: U.S. Department of Health 

and Human Services, Public Health Service. 
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Comment: One commenter referenced an NAS review of chemical 

health evaluations in the United States that concluded 

improvements in both chemical testing and risk assessment are 

needed to assure current risk evaluations protect people from 

toxic chemicals.70 The NAS recommended the EPA use “A consistent, 

unified approach for dose-response modeling that includes 

formal, systematic assessment of background disease processes 

and exposures, possible vulnerable populations, and modes of 

action that may affect a chemical’s dose-response relationship 

in humans; that approach redefines the RfD or RfC as a riskspecific dose that provides information on the percentage of the 

population that can be expected to be above or below a defined 

acceptable risk with a specific degree of confidence.” The NAS 

also observed that “[n]oncancer effects do not necessarily have 

a threshold, or low-dose nonlinearity” and found that “[b]ecause 

the RfD and RfC do not quantify risk for different magnitudes of 

exposure but rather provide a bright line between possible harm 

and safety, their use in risk-risk and risk-benefit comparisons 

and in risk-management decision-making is limited.”71

 

70 See National Research Council of the National Academies, Toxicity Testing 

in the Twenty-First Century: A Vision and a Strategy (2007); National 

Research Council of the National Academies, Phthalates and Cumulative Risk 

Assessment: The Tasks Ahead (2008); NAS, Science and Decisions. 

71 Janssen, S., et al., Strengthening Toxic Chemical Risk Assessments to 

Protect Human Health (2012), available at 

http://www.nrdc.org/health/files/strengthening-toxic-chemicalriskassessments-report.pdf (citing NAS, Science and Decisions). 
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The commenter stated that there may be no safe threshold in 

the human population for many chemicals and that newer studies 

show many chemicals increase the risk of various noncancer 

health effects - such as reproductive harm and neurological 

effects - at low doses, without any scientifically identifiable 

threshold.72 The commenter noted that even if a threshold is 

established for an individual, when risk is assessed across a 

diverse population, it is unlikely the same threshold applies to 

all individuals because some people are more vulnerable than 

others. 

The commenter stated that, to address the fact that very 

low levels of non-carcinogen exposures can pose health risks, 

NAS recommended that cancer and chronic non-cancer risk 

assessment use the same approach.73 The commenter noted that the 

use of RfCs for dose-response risk assessment of chronic noncancer health effects may significantly underestimate risk: “For 

these health effects, risk assessments focus on defining the 

reference dose (RfD) or reference concentration (RfC), which is 

defined as a dose ‘likely to be without an appreciable risk of 

 

72 Janssen et al., Strengthening Toxic Chemical Risk Assessments to Protect 

Human Health 

73 NAS, Science and Decisions, at 8-9, 265-66. 
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deleterious effects’ over a lifetime of exposure. In actual 

fact, these levels may pose appreciable risks.”74

The commenter asserted that the EPA ignored the best 

available, current science showing that pollutants have health 

effects at low doses in its evaluation of health thresholds for 

HCl, HF, and Cl2 and ignored NAS’s recommendation that the EPA 

use similar approaches for chronic non-cancer as for cancer risk 

assessment, which presumes deleterious health effects for any 

amount of exposure. According to the commenter, the EPA lacked 

sufficient data to demonstrate that these pollutants do not 

cause harm at low levels of exposure over time and cannot be 

certain that there exists an established, safe health threshold 

at the proposed thresholds. The commenter also stated that, 

because it must be assumed that these pollutants cause harm at 

low doses, it is impossible for the EPA to meet the CAA’s 

requirement for an “ample margin of safety.” The commenter 

concluded the EPA’s use of CAA section 112(d)(4) standards for 

HCl, HF, and Cl2 is indefensible because the EPA determined the 

thresholds based on studies that did not identify a level at 

which no health effects were observed (i.e., a NOAEL) and the 

EPA itself has low confidence in the proposed thresholds. 

 

74 Janssen, S., et al., Strengthening Toxic Chemical Risk Assessments to 

Protect Human Health at 10. 
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Response: The NAS has recognized that many of the 

recommended changes for the IRIS Program will need to be 

incorporated over a number of years and further recommended that 

assessments continue to be developed as the recommendations are 

implemented (i.e., the regulatory process should not be halted 

until all recommendations can be enacted). Improvements will 

thus be made over time and the best science available will be 

used in the interim. Further, the EPA has a legal obligation to 

proceed with regulatory action based on the best, currently 

available tools. 

The EPA’s conclusion that HCl, HF and Cl2 are threshold 

pollutants is based on the best available toxicity database 

considered in hazard identification and dose response 

assessments. There is agreement on using a similar threshold 

approach for these chemicals across agencies, e.g., the EPA’s 

IRIS Program, ATSDR and CalEPA. The toxicity assessments (which 

may include noncancer and/or cancer toxicity assessments) 

provided by these authoritative bodies are widely vetted through 

the scientific community and undergo rigorous peer review 

processes before they are published. In addition, the SAB has 

endorsed the use of the reference values derived by these 

sources to support EPA’s risk assessments in the RTR program. 
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Specifically, none of the compounds discussed here has been 

classified as carcinogenic or suggestive of the potential to be 

carcinogenic, individually or in combination by existing 

authoritative bodies including the EPA, CalEPA, IARC, OECD, and 

the European Community. In light of the absence of evidence of 

carcinogenic risk for any of these pollutants, and the evidence 

of an existing threshold below which HCl, HF and Cl2 are not 

expected to cause adverse effects, the EPA considers it 

appropriate to set health threshold standards under CAA 

112(d)(4) for these pollutants. 

2. Co-Benefits 

Comment: One commenter stated that the EPA’s proposal not 

to set MACT standards for acid gases did not fully consider the 

co-benefits of controlling criteria pollutants. The commenter 

noted that the legislative history makes clear that employing a 

CAA section 112(d)(4) standard rather than a conventional MACT 

standard “shall not result in adverse environmental effect which 

would otherwise be reduced or eliminated.”75 The EPA asserted 

that where there is an established health threshold, the agency 

may weigh additional factors in making a judgment as to whether 

to set CAA section 112(d)(4) standards or MACT standards, 

including “[c]o-benefits that would be achieved via the MACT 

 

75 S. Rep. No. 101-228, at 171 
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standard, such as reductions in emissions of other HAP and/or 

criteria pollutants” (79 FR 75622). The commenter asserted that 

it is impossible to make this assessment without evaluating the 

full collateral benefits of a MACT standard. 

The commenter noted that the EPA has recognized that MACT 

standards for HCl in other source categories resulted in 

reductions in emissions of PM, hydrogen cyanide, and other 

criteria and HAP pollutants and has relied upon the co-benefits 

of these reductions as a basis for not setting risk-based 

standards for those other source categories.76 However, for BSCP 

and clay ceramics plants, the EPA only considered the cobenefits of reductions in sulfur dioxide (SO2). The commenter 

argued the EPA should have considered the significant reductions 

 

76 See, e.g., National Emission Standards for Hazardous Air Pollutants from 

the Portland Cement Manufacturing Industry and Standards of Performance for 

Portland Cement Plants, 75 FR 54970, 54984 (Sept. 9, 2010) (“Setting 

technology-based MACT standards for HCl ... would likely also result in 

additional reductions in emissions of mercury, along with condensable PM, 

ammonia, and semi-volatile compounds.”); id. at 54,985 (“Setting an HCl 

standard under 112(d)(2) and (3) allows the Agency to also address” HCN, 

ammonia, and other pollutants.); National Emission Standards for Hazardous 

Air Pollutants from the Portland Cement Manufacturing Industry, 74 FR 21136, 

21160 (May 6, 2009) (“[S]etting a MACT standard for HCl is anticipated to 

result in a significant amount of control for other pollutants emitted by 

cement kilns, most notably SO2 and other acid gases, along with condensable 

PM, ammonia, and semi-volatile compounds.”); 75 FR 32030 (“[S]etting 

conventional MACT standards for HCl as well as PM ... would result in 

significant reductions in emissions of other pollutants, most notably SO2, 

non-condensable PM, and other non-HAP acid gases (e.g., hydrogen bromide) and 

would likely also result in additional reductions in emissions of mercury and 

other HAP metals (e.g., selenium).”); 76 FR 25051 (“[S]etting conventional 

MACT standards for HCl as well as PM ... would result in significant 

reductions in emissions of other pollutants, most notably SO2, PM, and other 

non-HAP acid gases (e.g., hydrogen bromide) and would likely also result in 

additional reductions in emissions of Hg and other HAP metals (e.g., Se).”). 
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in PM, hydrogen cyanide, and other pollutants that would likely 

result from MACT standards for HCl, HF, and Cl2, as these are the 

same reductions that the EPA considered in its past rulemakings. 

The commenter stated that these reductions will provide enormous 

health and environmental benefits that would not occur if CAA 

section 112(d)(4) standards are finalized instead. 

Response: Although not explicitly stated in the preamble to 

the proposed rule, the EPA agrees with the commenter that MACT 

standards for acid gases for BSCP facilities are associated with 

additional reductions of PM emissions (approximately 460 tpy in 

the third year following promulgation of the standards) and nonHg HAP metals emissions. No additional PM or non-Hg HAP metals 

emission reductions would be expected from sanitaryware tunnel 

kilns because it is anticipated that all sanitaryware tunnel 

kilns could meet the MACT floor emission limits for HF and HCl 

without additional APCD. The EPA has no information suggesting 

that HCN is emitted from BSCP or clay ceramics facilities, so no 

reduction in HCN would be expected from MACT standards for HF, 

HCl, and Cl2. 

For the past rulemakings in which the EPA considered cobenefits as part of a CAA section 114(d)(4) evaluation, the EPA 

did not quantify the PM emissions reductions associated with 

MACT standards (see 79 FR 75641, footnote 27), so a direct 
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comparison of the co-benefits of the BSCP Manufacturing NESHAP 

and the Clay Ceramics Manufacturing NESHAP with the co-benefits 

of these other rules for PM is not possible. The only pollutant 

with quantified emissions reductions in the co-benefits analyses 

for these other rulemakings was SO2, so that was the pollutant 

highlighted in the co-benefits analysis for BSCP and clay 

ceramics at proposal. The additional nationwide reductions of SO2

that would be attributable to MACT standards for acid gases in 

the BSCP Manufacturing NESHAP are estimated to be only 4,700 tpy 

in the third year following promulgation of the standards. No 

additional nationwide reductions of SO2 would be attributable to 

MACT standards for acid gases in the Clay Ceramics Manufacturing 

NESHAP because it is anticipated that all sanitaryware tunnel 

kilns could meet the MACT floor emission limits without 

additional APCD. As noted at proposal, these reductions are 

substantially lower than the co-benefits from MACT standards for 

other industries for which the EPA has decided not to set a 

HBEL, and it would not be expected to provide a significant 

public health benefit. 

3. Ecosystem Impacts 

Comment: One commenter expressed concern about the 

ecological impacts of the proposed HBEL for acid gases. The 

commenter stated that federal, state and local agencies have 
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struggled for years to reduce emissions of SO2 and other acid 

gases to prevent the devastating effects of acid rain on large 

ecosystems and noted the proposed standards would likely result 

in the acidification of the ecosystems in close proximity to 

BSCP and clay ceramics manufacturing sources. The commenter 

asserted the ecological impact analysis of the emissions 

standards for this proposal is inadequate. 

Response: The EPA disagrees with the commenter that the 

ecological analysis is inadequate. The environmental screening 

analysis evaluated potential damage and reduced productivity of 

plants due to chronic direct exposure to HCl and HF emitted by 

Clay Ceramics Manufacturing facilities and BSCP Manufacturing 

facilities into the air. The chronic 90-day benchmarks used in 

the environmental risk screen for the acid gases are shown in 

Table 6 of this preamble and discussed in the following section. 

TABLE 6. ACID GAS BENCHMARKS INCLUDED IN THE ENVIRONMENTAL RISK SCREEN

a Micrograms per cubic meter. 

b Note that the human health RfC is 20 μg/m3, which is lower than the 

ecological benchmark. 

For HCl, the EPA identified chronic benchmark 

concentrations as described in a 2009 EPA document on RTR risk 

Acid Gas Chronic 90-day Benchmark in μg/m3a

Hydrochloric acid - LOEL 50b

Hydrofluoric acid – Plant Community LOEL 0.5 

Hydrofluoric acid – Plant Community LOEL 0.4 
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assessment methodologies.77 The chronic benchmark for HCl was 

based on a lowest observed effects level (LOEL) from a shortterm exposure (20 minutes) that related HCl concentration to 

“changes” in the leaves of 7 out of 8 plant species as reported 

by Lerman et al.78 It was the lowest exposure concentration at 

which effects of any type were seen (visible injury to some 

proportion of leaves). Haber’s law was used to extrapolate the 

1.5 mg/m3 LOEL concentration (20-minute exposure) to a 0.5 mg/m3

concentration expected to produce the same effect after 1 hour. 

The 1-hr estimated LOEL was extrapolated to a chronic benchmark 

by dividing by a factor of ten to yield 0.050 mg/m3, or 50 μg/m3. 

For HF, the EPA used two chronic benchmark concentrations 

for plants in the environmental screening analysis. The value of 

0.5 μg HF/m3 is based on the Washington State criterion for 

gaseous HF and represents a LOEL. The value of 0.4 μg HF/m3 is 

based on the Environment Canada criteria and also represents a 

LOEL. 

To protect vegetation from adverse effects resulting from 

HF exposure, the Canadian Council of Ministers of the 

 

77 US EPA, 2009. Risk and Technology Review (RTR) Risk Assessment 

Methodologies: For Review by the EPA’s Science Advisory Board with Case 

Studies – MACT I Petroleum Refining Sources and Portland Cement 

Manufacturing. EPA-452/R-09-006. http://www.epa.gov/ttn/atw/rrisk/rtrpg.html. 

78 Lerman, S., O.C. Taylor, and E.F. Darley, 1976. Phytotoxicity of Hydrogen 

Chloride Gas with a 

Short-Term Exposure. Atmospheric Environment, Vol.10, pp. 873-878. 
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Environment79 recommends that HF concentrations not exceed 0.4 

μg/m3 over a 30- to 90-day period; HF concentrations can be 

higher for shorter exposures). Environment Canada80 defined the 

effect represented by the level of 0.4 μg HF/m3 as: 

“The level above which there are demonstrated effects on 

human health and/or the environment. It is scientifically 

based and defines the boundary between the lowest observed 

adverse effect level (LOAEL) and the no observed adverse 

effect level (NOAEL). It is considered to be the level of 

exposure just below that most likely to result in a defined 

and identifiable but minimal effect. The reference levels 

have no safety factors applied to them, as they are related 

directly to the LOAEL, and are the most conservative 

estimates of the effect level.” 

High concentrations of HF in the air have also been linked 

to fluorosis in livestock. However, the HF concentrations at 

which fluorosis in livestock occur are higher than those at 

which plant damage begins. Therefore, the benchmarks for plants 

are protective of both plants and livestock. 

For Clay Ceramics Manufacturing facilities, the 

environmental risk screen indicated that the area-weighted 

average modeled concentration of HCl around each facility (i.e., 

 

79 CCME. 1999b. Canadian National Ambient Air Quality Objectives: Process and 

Status. In: Canadian Environmental Quality Guidelines, 1999, Canadian Council 

of Ministers of the Environment, Winnipeg. Publication No. 1299, ISBN 1-

896997-34-1. Available at http://ceqg-rcqe.ccme.ca/download/en/133/. 

80 EC. (Environment Canada). 1996. National Ambient Air Quality Objectives for 

Hydrogen Fluoride (HF). Science Assessment Document. A Report by the 

CEPA/FPAC Working Group on Air Quality Objectives and Guidelines. July. ISBN 

0-662-25641-7, Catalogue En42-17/6-1997. Available online at: 

http://www.bape.gouv.qc.ca/sections/mandats/ap50_rio_tinto_alcan/documents/DQ

3.1.1.pdf. 
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the area-weighted average concentration of all offsite data 

points in the modeling domain) did not exceed the ecological 

benchmark. In addition, the ecological benchmark was not 

exceeded at any offsite receptor location for any facility. For 

HF, the environmental risk screen indicated that the areaweighted average modeled concentration of HF around each Clay 

Ceramics Manufacturing facility did not exceed the ecological 

benchmark. There were multiple facilities with modeled 

concentrations of HF at offsite receptor locations that exceeded 

the ecological benchmark, but the area over which the value was 

exceeded was no greater than 1 percent of the offsite modeling 

domain for each facility, indicating that there would not be any 

significant or widespread environmental effects. 

For BSCP Manufacturing facilities, the environmental risk 

screen indicated that the area-weighted average modeled 

concentrations of HCl and HF around each facility (i.e., the 

area-weighted average concentration of all offsite data points 

in the modeling domain) did not exceed the ecological 

benchmarks. In addition, the area over which the HCl or HF 

benchmarks were exceeded was less than 1 percent of the offsite 

modeling domain for each facility in the category, indicating 

that there would not be any significant or widespread 

environmental effects. 
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The EPA did not conduct an assessment of the potential for 

emissions of HCl to cause acidification in close proximity to 

the sources in this category. Acid deposition, more commonly 

known as acid rain, primarily occurs when emissions of SO2 and 

nitrogen oxides (NOX) react in the atmosphere (with water, 

oxygen, and oxidants) to form various acidic compounds.81

Although some studies indicate that HCl emissions could 

contribute to acidification around emission sources in certain 

environments,82 its overall effect relative to NOX and SO2

emissions would be small. In addition, the commenter did not 

provide any data to support their assertion that the proposed 

standards would result in the acidification of the ecosystems in 

close proximity to BSCP and structural clay products 

manufacturing facilities. 

4. Cumulative Effects 

Comment: One commenter expressed concern that the EPA did 

not fully consider the cumulative effects of exposure to HAP 

when proposing the health-based standard under CAA section 

112(d)(4). The commenter asserted that the agency assumed there 

are no cumulative health and environmental impacts of concern 

 

81 National Acid Precipitation Assessment Program Report to Congress, 2005. 

Also see - http://www.epa.gov/acidrain/reducing/index.html 

82 Hydrochloric Acid: An Overlooked Driver of Environmental Change. 

Environmental Science and Technology 2011, 45, 1187-1894. 
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and argued the EPA cannot ensure that its proposed standards 

include an ample margin of safety without properly accounting 

for the additive and/or synergistic effects of multiple 

pollutants and the cumulative effects of nearby emissions. 

Another commenter stated that the EPA made no adjustments 

to the HBEL it selected to account for the potential for harm 

from exposures other than to the amounts of HCl, HF, and Cl2 it 

proposed to allow. Specifically, the EPA must consider emissions 

of HCl, HF, and Cl2 and other pollutants with biologically 

similar endpoints (i.e., that cause respiratory harm) from 

sources in the source category as well as from any co-located 

sources and other stationary or mobile sources located such that 

their emissions affect people who are also exposed to the 

emissions subject to the NESHAP. The commenter asserted that the 

EPA cannot lawfully set limits “with an ample margin of safety” 

when it ignores other sources of exposure and cumulative health 

effects. The commenter asserted that, to protect exposed 

populations, the regulated sources must reduce their emissions 

to a level that ensures the total concentration of pollutants 

will remain below the pollutants’ respective health thresholds. 

The commenter asserted that the EPA’s decision to ignore the 

impact of other emissions and background concentrations in the 

implementation of the HBEL is therefore arbitrary, capricious, 
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an abuse of discretion, and otherwise not in accordance with 

law. 

If the ambient concentration of a particular pollutant is 

already at or near the health threshold, the commenter asserted 

that an additional source of that pollutant or another pollutant 

with a biologically similar endpoint can push the exposure over 

the threshold, even if the additional source emits the pollutant 

at low concentrations. The total risk that is unacceptable for 

the most-exposed person in each source category must be reduced 

to consider the cumulative effect of these additional exposures 

and to create a total risk from all regulated source categories. 

The commenter stated that EPA’s assessment of cumulative 

risks posed by HCl, HF, and Cl2 emissions ignored emissions from 

co-located sources (for BSCP kilns), nearby sources and all 

other potential sources that could contribute to background 

levels. The commenter noted that the EPA has emissions 

information about co-located and nearby sources in its own 

databases but failed to evaluate whether cumulative exposures 

would exceed the health thresholds and to consider combined 

exposures. The commenter reviewed reports from the EPA’s 

Enforcement and Compliance History Online (ECHO) Web site for a 

number of BSCP and clay ceramics facilities and provided notes 

on other major source facilities in close proximity. The 
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commenter stated that the EPA’s justifications regarding 

cumulative nearby emissions are legally inadequate and factually 

inaccurate. The commenter stated that general assertions that 

other operations are not “commonly” co-located with BSCP and 

clay ceramics facilities, that such facilities are “typically” 

located on large tracts of land, and that facilities are set 

back from property lines in rural areas are insufficient to set 

the emissions standard at a level that protects all people 

living near such facilities. 

The commenter stated that information in the EPA’s own 

databases demonstrates that BSCP and clay ceramics facilities 

are not predominantly located in rural, sparsely populated 

areas, as the EPA assumes. Many of the BSCP facilities are 

located in urban areas, including Boral Bricks in Terre Haute, 

IN; Hanson Brick in Columbia, SC; General Shale Brick in Denver, 

CO; and Cherokee Brick & Tile in Macon, GA.83 Similarly, in the 

clay ceramics source category, only two of the sources are 

located in areas considered “rural” by the United States Census 

Bureau: American Marazzi Tile in Sunnyvale, TX, and the Kohler 

Wisconsin Plant outside of Sheboygan, WI.84

 

83 U.S. Census Bureau, 2010 Census Urban and Rural Classification and Urban 

Area Criteria: Lists of 2010 Census Urban Areas, 

http://www2.census.gov/geo/docs/reference/ua/ua_list_all.xls 

84 U.S. Census Bureau, 2010 Census Urban and Rural Classification and Urban 

Area Criteria, https://www.census.gov/geo/reference/ua/urban-rural-2010.html 

(revised Feb. 9, 2015) (searching plant location by city listed in address). 
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The commenter stated that the EPA’s assessment of 

cumulative risks does not meet generally accepted good practices 

in risk assessment. The SAB recommended in May 2010 that the EPA 

incorporate “aggregate and cumulative risks, including 

background concentrations and contributions from other sources 

in the area” into its risk analysis.85 The commenter stated that 

the EPA must assess the total and cumulative risk burden, rather 

than only looking at each type of risk in a discrete, separate 

way, and the EPA should be integrating its assessments and 

performing a “comprehensive risk assessment” as the NAS has 

emphasized. After first assessing the total cancer, chronic noncancer, and acute risks, for both inhalation and multipathway 

exposure, the EPA also must assess the total risks.86 The EPA 

must aggregate health risk for each pollutant, and each type of 

health risk, to create a cumulative risk determination for an 

individual with maximum exposure. Without a combined health risk 

metric, the EPA cannot make an ample margin of safety 

determination that is based on the full picture of health risk 

for these source categories. 

 

85 Memorandum from Science Advisory Board, U.S. EPA, to Lisa Jackson, Adm’r, 

U.S. EPA re: Review of EPA’s Draft, EPA-SAB-10-007 at 6 (May 07, 2010). 

86 CalEPA, OEHHA, Cumulative Impacts at 19-21, 25 (describing total “pollution 

burden” as sum of exposures, public health effects, and environmental 

effects); EPA, Concepts, Methods and Data Sources for Cumulative Health Risk 

Assessment of Multiple Chemicals, Exposures and Effects, at 4-42 to 4-46 

(Aug. 2007) 
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Finally, the commenter stated that this proposal is 

contrary to the EPA’s recent conclusion in its regulation of 

power plant electric generating units that “the potential 

cumulative public health and environmental effects of acid gas 

emissions” did not allow for CAA section 112(d)(4) standards.87

In that rulemaking, the EPA did not receive facility-specific 

emissions information for all the acid gases from units in the 

source category, co-located sources, and all nearby sources. The 

EPA concluded that “cumulative impacts of acid gases on public 

health were not assuaged by the comments received.” The 

commenter stated that the EPA did not consider that information 

in this rulemaking either, and just as in the power plant 

rulemaking, HBEL are not lawful. 

Response: The EPA disagrees with the commenter that the EPA 

did not consider the potential impacts of nearby BSCP and clay 

ceramics facilities or other nearby facilities on the 

determination of the HBEL for each source category. The limit 

reflects the impacts of all facilities in the source category. 

While the risk assessment did not perform a detailed modeling 

analysis of other nearby facilities, based on a proximity 

analysis of sources emitting acid gases, the EPA concludes that 

 

87 Responses to Public Comments on EPA’s National Emission Standards for 

Hazardous Air Pollutants from Coal- and Oil-Fired Electric Utility Steam 

Generating Units, vol. 1. 
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the emissions from these facilities would not have significantly 

impacted the analysis for several reasons. First, the limit 

reflects a hazard index (HI) less than or equal to one at the 

highest impacted receptor at each facility. For source 

categories like BSCP and clay ceramics where emission release 

heights are low, the highest impacted receptor is always very 

near (e.g., shares a common fenceline) the facility, and ambient 

concentrations fall quickly with distance from the source. 

Because of this, other facilities would have to be very near a 

BSCP or clay ceramics facility and have relatively high 

emissions to have any significant impact on the receptor with 

the highest estimated concentration from the BSCP or clay 

ceramics emissions. As in risk assessments performed under the 

Risk and Technology Review program, the EPA did not model the 

nearby sources in the National Emissions Inventory (NEI) because 

that inventory has not received the same level of review and 

quality assurance that the BSCP emissions have for the purposes 

of this rulemaking. 

Although the EPA did not model the other nearby facilities, 

the EPA did compare the location of all sources emitting acid 

gases with the locations of the BSCP and clay ceramics 

facilities. The EPA found that only four facilities emitted acid 

gases within 1 kilometer of any BSCP facility. Beyond 1 
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kilometer, we would expect very little coincidental impacts from 

multiple low level sources emitting the same pollutants. The 

largest of these facilities emitted less than 12 tpy of HClequivalent emissions, or less than 5 percent of the emissions 

limit. The estimated HI for this BSCP facility was 0.6, so an 

increase of 5 percent in emissions would result in an increase 

in HI of at most 5 percent and thus not increase the HI above a 

value of 1. There are no other sources emitting acid gases 

within 1 kilometer of any clay ceramics facility. 

Also, for the BSCP plant with the highest estimated HI, 

there are no other acid gas emissions indicated in the NEI 

within 5 kilometers of the facility. For the clay ceramics plant 

with the highest estimated HI, there are no other acid gas 

emissions indicated in the NEI within 10 kilometers of the 

facility. Thus, we would not expect emissions of acid gases from 

other sources to contribute significantly at the receptors where 

the maximum HI occurs due to BSCP or clay ceramic emissions, and 

the HI at these receptors would not exceed one. 

5. Risk Assessment 

Comment: One commenter stated that the HEM-3 meteorological 

data used for dispersion calculations was insufficient because 

it included data for only 1 year (2011) from only 824 
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meteorological stations. The commenter asserted that this 

provides a very limited snapshot of air quality data and, 

therefore, is insufficient to determine with confidence that 

exposures at the proposed emissions standards pose “no risk” of 

adverse health effects. The commenter stated that it is unlawful 

and arbitrary to set CAA section 112(d)(4) standards without 

more extensive air quality information. 

Response: The EPA disagrees with the commenter that the 

meteorological data were insufficient to perform the risk 

assessment. Although 5 years of meteorological data are 

preferred for assessing chronic exposures and risks, we use a 

single year (2011) of meteorological data in our risk 

assessments because of model run times for the Human Exposure 

Model (HEM-3) air dispersion model (AERMOD). Because we 

frequently run AERMOD for an entire source category with many 

individual emissions points and for many receptors, using 5 

years of meteorological data would increase already significant 

model run times by a factor of five compared to a single year. 

In a sensitivity analysis of the impact of using a single year 

of meteorological data compared to 5 years,88 we found that 

 

88 US EPA, 2009. Risk and Technology Review (RTR) Risk Assessment 

Methodologies: For Review by the EPA’s Science Advisory Board with Case 

Studies – MACT I Petroleum Refining Sources and Portland Cement 

Manufacturing. EPA-452/R-09-006. http://www.epa.gov/ttn/atw/rrisk/rtrpg.html. 
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modeled concentrations differed by less than 10 percent on 

average and, thus, the use of 1 year of meteorological data is 

not likely to appreciably affect the results of the risk 

assessment. 

The meteorological data we used were obtained from the 

Automated Surface Observing Systems (ASOS) program, which is a 

joint effort of the National Weather Service (NWS), the Federal 

Aviation Administration (FAA), and the Department of Defense 

(DOD). The ASOS serves as the nation’s primary surface weather 

observing network and is designed to support weather forecast 

activities and aviation operations and, at the same time, 

support the needs of the meteorological, hydrological, and 

climatological research communities. With the largest and most 

modern complement of weather sensors, ASOS has significantly 

expanded the amount of available meteorological information. The 

ASOS works non-stop, updating observations every minute, 24 

hours a day, every day of the year. The ASOS is installed at 

more than 900 airports across the country, and our 

meteorological library for the year 2011 includes all of these 

that are without a significant number of missing hours (824 

stations). 

Comment: Two commenters stated that the EPA’s modeling 

understates chronic health risk by assuming that chronic 
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exposure to HAP from BSCP and clay ceramic manufacturing sources 

occurs at the census block centroid and not at the facility 

fence or property line. The commenters stated that exposures are 

likely to be higher for people living closest to the plants, 

especially because census blocks can cover a large area and the 

center of a census block is almost always farther away from the 

facility than the facility’s property line. One commenter noted 

that even if the area near the property line is not developed, 

over time homes and businesses could locate closer to the 

facility. While it is possible that population distribution is 

homogenous over a census block, the commenter stated this 

assumption is not necessarily accurate in considering the 

predicted impacts from the location of a source. 

One commenter stated that no effort was made to move 

receptor points closer to the facility to assess chronic or 

cancer risk, even in those instances where local residents live 

nearer to a facility than the geographic centroid of the census 

block. This conflicts with the recommendation of the SAB, which 

has urged the EPA to consider “specific locations of 

residences.”89 The commenter stated that the EPA failed to adjust 

receptor points for residents living on the fence-line even 

though the HEM-AERMOD system allows for such an adjustment, and 

 

89 Memorandum from Scientific Advisory Board re: Review of EPA’s Draft at 4. 
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that such an adjustment was appropriately made for the 

estimation of acute health risks (see, e.g., 79 FR 75644). The 

commenter stated that the EPA cannot justify failing to analyze 

chronic health effects in a similar manner. 

Another commenter agreed and stated that the EPA can use 

HEM-3 to identify the maximum individual risk at any point in a 

census block that is within a 50-kilometer radius from the 

center of the modeled facility. The commenter recommended the 

EPA not use the predicted chronic exposures at the census block 

centroid as a surrogate for the exposure concentrations for all 

people living in that block; instead, the EPA should use the 

maximum individual risk in its risk assessments, irrespective of 

its location in the census block. 

Response: The EPA disagrees with the commenters’ assertion 

that we relied solely on the census block centroids as receptors 

for human exposure. As we have noted in the development of RTR 

regulations, in a national-scale assessment of lifetime 

inhalation exposures and health risks from facilities in a 

source category, it is appropriate to identify exposure 

locations where it may be reasonably expected that an individual 

will spend a majority of his or her lifetime. Further, in 

determining chronic risks, it is appropriate to use census block 

information on where people actually reside, rather than points 
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on a fenceline, to locate the estimation of exposures and risks 

to individuals living near such facilities. 

Census blocks are the finest resolution available as part 

of the nationwide population data (as developed by the U.S. 

Census Bureau); each is typically comprised of approximately 50 

people, or about 20 households. In the EPA risk assessments, the 

geographic centroid of each census block containing at least one 

person is used to represent the location where all the people in 

that census block live. The census block centroid with the 

highest estimated exposure then becomes the location of maximum 

exposure, and the entire population of that census block is 

assumed to experience the maximum individual risk. In some 

cases, because actual residence locations may be closer to or 

farther from facility emission points, this may result in an 

overestimate or underestimate of the actual annual 

concentrations (although there is no systematic bias for average 

levels). Given the relatively small dimensions of census blocks 

in densely populated areas, there is little uncertainty 

introduced by using the census block centroids in lieu of actual 

residence locations. There is the potential for more uncertainty 

when census blocks are larger, although there is still no 

systematic bias. The EPA concludes that the most appropriate 

locations at which to estimate chronic exposures and risks are 
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the census block centroids because: 1) census blocks are the 

finest resolution available in the national census data, 2) 

facility fencelines do not usually represent locations where 

chronic exposures are likely and 3) there is no bias introduced 

into the estimate of the MIR by using census block centroid 

locations. In addition, in its peer review of the methodologies 

used to estimate risks as part of the RTR rulemaking efforts, 

the EPA’s SAB endorsed this approach. 

In addition to the approach described above, the EPA 

recognizes that where a census block centroid is located on 

industrial property or is large and the centroid is less likely 

to be representative of the block’s residential locations, the 

block centroid may not be the appropriate surrogate. For BSCP 

facilities, in cases where a census block centroid was within 

300 meters of any emission source (and therefore possibly on 

facility property), we viewed aerial images of the facility to 

determine whether the block centroid was likely located on 

facility property. Likewise, we examined aerial images of all 

large census blocks within 1 kilometer of any emission source. 

If the block centroid did not represent the residential 

locations within that block, we relocated it to better represent 

them and/or we added additional receptors for residences nearer 

to the facility than the centroid. For this source category, we 
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relocated 14 census blocks that appeared to be on facility 

property or were otherwise not representative of the population 

within the block, and we modeled an additional 15 receptors in 

cases where the single block centroid was inadequate to 

characterize the population within the census blocks. 

Comment: One commenter stated that the EPA’s risk 

assessment did not account for the synergistic health effects 

from the potential exposure to multiple acid gas pollutants 

Specifically, the EPA did not demonstrate that no health effects 

would occur if a person is chronically exposed to a combination 

of HCl, HF, and Cl2, even if the sum of the exposures (converted 

into “equivalent” units) does not exceed the “HCl-equivalent” 

limit. The commenter also argued the EPA failed to provide 

evidence showing that the acid gases would not have synergistic 

effects that could cause harm at a chronic exposure 

concentration that is lower than the RfC, REL, or MRL of each 

pollutant. The commenter asserted the EPA did not seek outside 

peer review by the SAB or other body or request public comment 

on its use of dose-response values to exchange exposures of one 

acid gas pollutant for another prior to proposing use of “HClequivalents” standards. 

The commenter stated that since the EPA based the ratio for 

comparing HF and Cl2 emissions to HCl emissions on the RfC, REL 
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or MRL values, and those values are uncertain and flawed (see 

previous comments in this section V.A, explaining that values 

were not based on a NOAEL, and the EPA has “low” confidence in 

the HCl RfC), the HCl-equivalent method cannot assure “an ample 

margin of safety.” The commenter asserted that CAA section 

112(d)(4) requires the EPA to set separate standards for HCl and 

HF, and the EPA’s decision to set a HCl-equivalent emissions 

standard is unlawful and arbitrary. 

Response: The EPA believes that groups of chemicals can 

behave antagonistically or synergistically, such that combined 

exposure can either cause less or more harm, depending on the 

chemicals. However, the information needed to perform such an 

analysis is generally not available. To address pollutant 

mixtures in the determination of the HBEL, the EPA generally 

used the same methodology used in RTR assessments, which is to 

follow the EPA’s mixture guidelines.90,91 This methodology has 

been formally peer reviewed by the SAB.92 Following the mixture 

guidelines, the EPA aggregated noncancer HQs of HAP that act by 

similar toxic modes of action or that affect the same target 

 

90 US EPA, 1986. Guidelines for the Health Risk Assessment of Chemical 

Mixtures. EPA-630-R-98-002. 

91 US EPA, 2000. Supplementary Guidance for Conducting Health Risk Assessment 

of Chemical Mixtures. 

92 US EPA, 2010. SAB’s Response to EPA’s RTR Risk Assessment Methodologies. 

http://yosemite.epa.gov/sab/sabproduct.nsf/4AB3966E263D943A8525771F00668381/$

File/EPA-SAB-10-007-unsigned.pdf 
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organ. This process creates, for each target organ, a TOSHI, 

defined as the sum of HQs for individual HAP that affect the 

same organ or organ system. All TOSHI calculations were based 

exclusively on effects occurring at the “critical dose” (i.e., 

the lowest dose that produces adverse health effects). The EPA 

actually calculated the HBEL conservatively by including HF in 

the calculation of equivalent emissions even though it affects a 

different target organ than HCl and Cl2, thereby allowing the 

development of a single emissions limit for all acid gases. The 

conservatism in the limit due to the inclusion of pollutants 

with different target organ systems would have the effect of 

ameliorating potential synergism of the acid gases. 

6. Ample Margin of Safety 

Comment: One commenter disagreed with the EPA’s decision to 

set an HCl-equivalent HBEL, rather than set separate HBEL for 

HCl, HF, and Cl2. The commenter stated that, by setting one “HClequivalent emissions” limit at 250 tpy (57 lb/hr) for BSCP 

tunnel kilns and 600 tpy (140 lb/hr) for clay ceramics sources, 

each source is free to emit whatever combination of HCl, HF, and 

Cl2 it would like, provided the aggregate of the “HCl-equivalent 

emissions” does not exceed the limit. The commenter also noted 

that the HCl-equivalent HBEL for clay ceramics does not include 
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Cl2 and requested that the EPA explain how it converted Cl2 into 

HCl-equivalent emissions. 

The commenter stated that CAA section 112(d)(2) mandates 

that the EPA “shall require the maximum degree of reduction in 

emissions of the hazardous air pollutants subject to this 

section.” The commenter asserted that it is unlawful for the EPA 

not to set an emissions limit for a CAA section 112-listed 

pollutant (Nat’l Lime Ass’n, 233 F.3d at 634) and concluded that 

even if the EPA believes the health risks posed by HF and Cl2

emissions can be translated into HCl-equivalent units, the 

proposed “HCl-equivalent” limit contravenes the EPA’s obligation 

to set CAA section 112(d) standards for each pollutant. 

The commenter also stated that the EPA’s approach raises 

questions about whether the use of “HCl-equivalents” results in 

limits that protect people against all of a pollutant’s health 

risks with “an ample margin of safety,” as required by CAA 

section 112(d)(4). The commenter argued that because pollutants 

cause different adverse health effects, they are not 

“equivalent” pollutants that cause “equivalent” health effects 

at “equivalent” concentrations of exposure. The commenter 

further argued the RfC for HCl is based on a study of 

respiratory toxicity and is meant to protect individuals against 

respiratory harms from chronic exposures, while the REL used for 
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HF is based on a study of skeletal fluorosis (increased bone 

density) and is meant to protect individuals against skeletal 

harm from chronic exposures.93 The commenter noted that the EPA 

focused only on the respiratory harm caused by the pollutants, 

when skeletal harm is the most sensitive effect for HF, and the 

EPA failed to explain why skeletal harm caused by a certain 

quantity of HF can be converted into respiratory harm caused by 

HCl. 

The commenter also noted that the EPA does not claim to be 

using HCl as a surrogate for HF or Cl2. The commenter stated that 

the EPA previously stated that HCl cannot act as a surrogate for 

the other acid gases because pollutants that act on humans in 

different manners, at different doses, cannot stand in for one 

another (see 76 FR 25049 and 75 FR 32031). 

Another commenter expressed concern the HCl-equivalent 

emissions limit could mask exposures or emissions of concern for 

the most toxic gas because the comparison would be dominated by 

a higher concentration pertinent to the less toxic gases. The 

commenter asserted that there is no analysis that justifies this 

 

93 OEHHA, Chronic RELs and Toxicity Summaries, at 278. CalEPA made it clear 

that its REL is for “[i]ncreased bone density (skeletal fluorosis),” that the 

NOAEL was for “chronic skeletal fluorosis,” and that “[c]hanges in bone 

density ... appear[s] to be the most sensitive health effect for chronic 

exposure.” OEHHA, Chronic RELs and Toxicity Summaries at 272, 278-79. The 

principal study on which the REL is based did observe an increase in the 

incidence of acute respiratory disease, too, id. at 271, but the REL was not 

primarily based on that health effect. 
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combined metric and noted it would be more justifiable if the 

substances were in the same order of magnitude for potential 

potency. The commenter recommended that the EPA consider whether 

these gases could contribute to the acid component of ambient 

air that is thought to potentially contribute to cancer and 

other effects because these impacts appear not to have been 

considered by the EPA. 

Response: The EPA disagrees with the commenters’ assertion 

that the HBEL cannot be based on equivalent emissions of a 

single pollutant. For the BSCP Manufacturing rulemaking, the EPA 

used an approach specific for this NESHAP to set healthprotective emissions limits that would account for the multiple 

acid gas pollutants emitted by the BSCP facilities. By 

converting the emissions of each acid gas or combination of acid 

gases (HCl, Cl2 and HF) to an HCl-equivalent emission, the EPA 

can estimate a single exposure concentrations for comparison 

with the HCl reference value (RfC). If the ratio of HCl exposure 

concentration to the HCl RfC value remains at or below 1, the 

HBEL (HCl-equivalent emissions) would ensure that the threshold 

values for any individual or combination of acid gases would not 

be exceeded (i.e., remain at or below 1). The EPA used the same 

approach to convert emissions of HF to and HCl-equivalent and 

determine the HBEL for the Clay Ceramics Manufacturing NESHAP; 
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the only difference is that there are no valid Cl2 emissions data 

for clay ceramics facilities, so Cl2 is not included in the HBEL. 

Comment: Two commenters generally supported the proposed 

HBEL and stated that the EPA has conclusively demonstrated that 

the proposed HBEL would provide an ample margin of safety for 

HCl, HF, and Cl2 emissions from affected facilities. As the EPA 

explained in the proposal, the analysis was based on site 

specific data from each tunnel kiln, and the proposed HBEL was 

developed at a level that would result in an HQ of 1 at the 

worst-case facility. Because the potential risks at facilities 

other than the worst-case facility are predicted to be well 

below 1, the commenters stated that this analysis assures that 

an ample margin of safety will be provided for the “worst case” 

facility in the industry and more than an ample margin will be 

provided for all other affected facilities. 

Conversely, another commenter contended that the EPA’s 

proposed HBEL under CAA section 112(d)(4) does not include “an 

ample margin of safety.” The commenter disagreed with the 

approach the EPA used to determine the CAA section 112(d)(4) 

limits. Specifically, the commenter stated that by setting the 

limits at precisely the same level as the threshold value, the 

EPA proposed to allow plants to emit acid gas pollution that 
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would expose people to amounts of pollution that reach threshold 

levels. 

The commenter stated that these limits do not include any 

“margin of safety,” let alone an “ample” one, as the EPA is 

required to include for CAA section 112(d)(4) standards. The 

commenter expressed concern that under the EPA’s approach, even 

the slightest uncertainty in the EPA’s estimates or low 

background levels of pollution can place health at risk because 

plants can emit at the health threshold. The commenter stated 

that the EPA did not explain how these limits would protect 

public health with “an ample margin of safety.”94 The commenter 

asserted that a margin of safety is supposed to provide 

additional safety and account for uncertainty and variability 

that might result in harm to individuals below the threshold. 

The commenter further stated that an “ample” margin of safety 

must assure not only extra room for safety, but a “generous” 

margin for safety.95

The commenter noted that a TOSHI (which is the sum of the 

HQs) of “one” does not necessarily represent a safe level of 

 

94 Mountain Commc’ns v. FCC, 355 F.3d 644, 648-49 (D.C. Cir. 2004) (agency 

must “explain how its position can be reconciled” with statutory 

requirements). 

95 Webster’s Seventh New Collegiate Dictionary (1971) defines “margin” as “a 

spare amount or measure or degree allowed or given for contingencies or 

special situations” and “ample” as “generous or more than adequate in size, 

scope, or capacity.” 
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exposure. The commenter asserted the EPA characterizes a TOSHI 

or HQ of “one” or less as exposures that “are not likely to 

cause adverse health effects” (79 FR 75643) but did not provide 

any explanation why this level would meet the statutory 

standard. According to the commenter, Congress intended the 

standard to be set at a level at which there is “no risk” of 

“adverse health effects,” plus “an ample margin of safety (and 

not considering cost).”96 For these reasons, the commenter 

concluded that the proposed limits do not comply with the CAA 

and could put public health at risk. 

The commenter also expressed concern that the EPA did not 

take steps to adjust the limits to reflect the uncertainties 

regarding health exposures and effects. The EPA has factored in 

uncertainties and vulnerability factors in other rulemakings, 

such as when determining a Target Margin of Exposure under the 

FQPA, where the EPA considered whether risks below the Target 

Margin of Exposure warranted increased scrutiny and changes to 

allowable exposures.97 The commenter also stated that the EPA’s 

proposed limits would allow human exposures to exceed the level 

that CalEPA has identified is the safety minimum. Allowing human 

 

96 S. Rep. No. 101-228, at 171. 

97 See, e.g., EPA, Sulfuryl Fluoride; Proposed Order Granting Objections to 

Tolerances and Denying Request for a Stay, Proposed Rule, 76 FR 3422, 3427 

(Jan. 19, 2011) (explaining use of MOE). 
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exposure to HCl concentrations above a threshold a state agency 

determined may cause respiratory harm, the commenter contended, 

would not provide the ample margin of safety required by law. 

The commenter further stated that the “ample margin of 

safety” language in CAA section 112(d)(4) requires that any 

standard that is set under this authority must be sufficient to 

protect against significant unforeseen consequences.98 The 

commenter stated that because the “ample margin of safety” 

requirement is meant to protect against risks that have not yet 

been identified in research, a CAA section 112(d)(4) standard 

cannot be justified on grounds that the EPA does not have 

sufficient evidence about the health risks posed by a HAP or 

does not have the time or inclination to review the evidence 

that is available. 

Response: For several reasons, the EPA disagrees with the 

commenter who stated that the HBEL does not include an ample 

margin of safety. First, the limit is based on the single 

facility in the source category with the worst-case combination 

of meteorology and distance to nearest residential receptor that 

leads to the highest ambient concentrations. While the EPA 

 

98 See, e.g., Envtl. Def. Fund v. EPA, 598 F.2d 62, 81 (D.C. Cir. 1978) 

(holding that the phrase ‘ample margin of safety’ in the Clean Water Act’s 

toxic provisions required the EPA to protect against as yet unidentified 

risks to human health, including those “which research has not yet 

identified”). 
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estimates that the limit reflects an HI of one at this facility, 

the HI at most other facilities would be significantly lower, 

with approximately 90 percent of the facilities having an 

estimated HI less than or equal to 0.5. Further as the standard 

is based on a 1-hour emission limit, in determining chronic 

impacts, the analysis conservatively assumes that each plant 

emits at the 1-hour HBEL for an entire year (8,760 hours). Also, 

the limit is based on estimated ambient concentrations and not 

exposure concentrations. Exposure concentrations are typically 

lower than ambient concentrations because they reflect that 

people’s activities (e.g., work, school) remove them from their 

residential exposure locations for significant amounts of time. 

For these reasons, the EPA concludes that the emission limit is 

health protective (i.e., exposures will remain below the RfC 

values) and this conservative exposure scenario is consistent 

with the an “ample margin of safety” requirement in section 

112(d)(4). 

Comment: One commenter expressed concern that the EPA 

underestimated acute health risks in the evaluation of the risk 

of acute harm from short-term exposures by ignoring variability 

in short-term emissions. The commenter noted that the EPA 

calculated the 1-hour emissions estimates for its modeling of 

acute harm by dividing the annual emissions level by 8,760 hours 
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per year instead of using a default factor or emissions 

multiplier to account for higher-than-average short-term 

emissions. The commenter noted actual emissions over a 1-hour 

period will at times exceed the average hourly emissions level 

used in the modeling. The commenter asserted the EPA did not 

explain how this approach captures peak short-term emissions 

levels or adequately protects people from short-term exposures 

at levels above the average. 

The commenter stated that the EPA has used emissions 

multipliers to scale up average hourly emissions in air 

dispersion modeling for other risk assessments.99 The commenter 

asserted that although emission multipliers in risk assessments 

still underestimate risk, these assessments show the EPA 

recognizes the need to use multipliers in assessing health risks 

from short-term emissions. The commenter stated that it is 

 

99 See, e.g., National Emission Standards for Hazardous Air Pollutant 

Emissions: Group IV Polymers and Resins; Pesticide Ingredient Production; and 

Polyether Polyols Production; Proposed Rule, 77 FR 1268, 1279 (Jan. 9, 2012) 

(finalized at 79 FR 17340 (Mar. 27, 2014); see also National Emission 

Standards for Hazardous Air Pollutants: Ferroalloys Production, 79 FR 60238, 

60252 (Oct. 6, 2014) (applying “an emission adjustment factor” to “average 

annual hourly emission rates ... to account for emission fluctuations due to 

normal facility operations”); National Emissions Standards for Hazardous Air 

Pollutants Residual Risk and Technology Review for Flexible Polyurethane Foam 

Production, 78 FR 66108, 66122 (Nov. 4, 2013) (applying “a conservative 

default emissions multiplier of 10 to estimate the peak hourly emission rates 

from the average rates” as part of EPA’s screening of “worst-case acute 

impacts”); National Emissions Standards for Hazardous Air Pollutants: Mineral 

Wool Production and Wool Fiberglass Manufacturing, 76 FR 72770, 72785 (Nov. 

25, 2011) (applying an “emissions multiplier of 3 to estimate the peak hourly 

emission rates from the average rates”). 
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unlawful and arbitrary for the EPA not to use an emissions 

multiplier for estimating risk for this rulemaking. 

The commenter also stated that the EPA’s calculation of 1-

hour emissions assumed plants are operating (and generating 

emissions) 24 hours per day, 365 days per year. The commenter 

noted that averaging hourly emissions over the full calendar 

year produces lower hourly emissions than if the EPA had used 

each plant’s actual operating hours. The EPA has information 

about each plant’s operating hours and these data show many 

units are not operating over the full calendar year. By 

calculating the 1-hour emissions based on 8,760 operating hours, 

the commenter asserted the EPA underestimated the risks of acute 

exposures over shorter spans of time. 

The commenter stated that because the EPA used short-term 

emissions that are neither conservative nor realistic, the EPA 

cannot conclude the standard assures “an ample margin of 

safety.” The commenter stated that in two other recent 

rulemakings, the EPA found information on short-term HCl 

emissions was insufficient to allow the EPA to evaluate “whether 

a chronic health-based emission standard for HCl would ensure 

that acute exposures will not pose any health concerns.” (75 FR 

32031; 76 FR 25050). In these rulemakings, the commenter stated, 

the EPA did not proceed with risk-based standards due to the 
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lack of this information. The commenter stated that the EPA is 

incorrectly proceeding with the proposed health-based standards 

without accounting for or quantifying peak short-term emissions. 

Response: The use of an emissions multiplier to convert 

annual emissions to peak 1-hour emissions (determination of peak 

emissions for comparison with 1-hr health benchmarks) for acute 

(short-term) risk calculations was not necessary for this 

analysis, because the HBEL determined for the category is being 

promulgated as a mass of HCl-equivalent emitted per hour. 

Similarly, plant hours of operation need not be considered 

because the HBEL determined for the category is an hourly limit. 

As noted in the preamble to the proposed rule for BSCP, “To 

assure that no source emits more than the 250 tpy HCl-equivalent 

limit in a single hour, we propose setting the emissions limit 

at the hourly equivalent of 250 tpy (57 lb/hr of HCl-equivalent 

emissions)” (79 FR 75644). Similarly, for clay ceramics 

manufacturing, “to assure that no source emits more than the 600 

tpy HCl-equivalent limit in a single hour, we propose setting 

the emissions limit at the hourly equivalent of 600 tpy (140 

lb/hr of HCl-equivalent emissions)” (79 FR 75661). 

The EPA concludes the risk analysis and subsequent standard 

meet an “ample margin of safety” in accordance with the CAA. The 

proposed HBEL for the entire source category is based on an 
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emissions level corresponding to a maximum noncancer HI of one 

at the highest impacted facility. All other facilities would 

have a lower risk than the highest risk facility. Further, as 

the standard is based on a 1-hour emission limit, in determining 

chronic impacts, the analysis conservatively assumes that each 

plant emits at the 1-hour HBEL for an entire year (8,760 hours). 

Comment: One commenter disagreed with the EPA’s evaluation 

of acute health risks, stating that the approach is inadequate 

and does not assure standards are based on a safe health 

threshold and include “an ample margin of safety.” Specifically, 

the commenter expressed concern that the proposed HBEL are based 

on the chronic dose-response information and not on thresholds 

for acute health risks. The commenter noted the EPA approximated 

exposures, used those estimates to develop HQ values, and 

concluded “there is low potential for acute risk” when the HQ 

values are less than or equal to one. If values above one were 

identified, then the EPA examined additional information to 

determine whether there was a potential for “significant acute 

risks” for those living near the facility. The commenter noted 

that the EPA did not explain why this method satisfies the CAA 

section 112(d)(4) requirement that health-based standards be set 

at a level that ensures “an amply margin of safety” for people 

living near the facility. The EPA’s evaluation is designed to 
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determine whether any facilities pose “significant acute risks”; 

however, the commenter stated that this is not the statutory 

standard, and such a determination would not signify that an 

“ample margin of safety” is included. 

The commenter stated that for HF, the EPA’s evaluation 

identified numerous plants at which there were potential acute 

health risks. Specifically, the EPA found 23 BSCP facilities 

exceeded the HQ value for HF, with nearly half of those 

facilities exceeding the value by four- or five-fold. For the 

clay ceramics category, the EPA found that eight facilities 

exceeded the HQ value for HF. The additional analysis the EPA 

performed to determine whether these facilities posed 

“significant acute risks” did not rule out the possibility of 

such “significant acute risks.” For these facilities, the EPA 

focused its analysis on maximum offsite HQ values; however, the 

commenter noted that many of the maximum offsite HQ values 

exceed one, thereby indicating the potential for “significant 

acute risks” remained. The commenter asserted that the EPA 

provided no support for why values above one means there is no 

potential for “significant acute risks.” 

The commenter disagreed with the EPA’s assertion that there 

is no potential for “significant acute risks” because the risk 

assessment assumes there is a person present at the location and 
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time where the maximum HQ value occurs and stated that relaxing 

conservative assumptions about exposure in individual instances 

is arbitrary and defeats the purpose of the evaluation. The EPA 

cannot pretend that the person is not present and ignore the 

potential for harm. The EPA’s statement that a facility is not 

likely to emit only HF similarly provides no assurance of 

safety. According to the commenter, the EPA relaxed an 

assumption in the model because the model predicted an outcome 

the EPA did not like. The commenter stated the EPA provided no 

basis for its assertion that a facility is unlikely to emit only 

HF or explain why a combination of HF (for which the EPA found a 

potential for “significant acute risks”), HCl, and Cl2 emissions 

would not still pose “significant acute risks.” 

The commenter stated that the EPA’s use of acute exposure 

guideline levels (AEGLs) and emergency response planning 

guidelines (ERPGs) to assess acute risks cannot assure that 

exposure presents “no risk” of health effects at those 

concentrations. The AEGL and ERPG values were created for 

emergency exposure scenarios. The commenter stated that levels 

defined for “once-in-a-lifetime, short-term exposures” and 

“emergency” chemical releases or accidents are not appropriate 

for measuring acute exposure risk. According to the SAB, 

indicated “AEGL-2 and ERPG-2 values should never be used in 
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residual risk assessments because they represent levels that if 

exceeded could cause serious or irreversible health effects.”100

The commenter stated that because the AEGL and ERPG numbers 

would underestimate risk to the maximum exposed individual, AEGL 

and ERPG values do not indicate “safe” thresholds that protect 

health with “an ample margin of safety.” For these reasons, the 

commenter contends AEGL and ERPG values should not be used to 

set CAA section 112(d)(4) standards. 

Response: The EPA disagrees with the commenter that the 

EPA’s acute assessment includes arbitrary decision-making and 

does not reflect an ample margin of safety. The EPA is not 

required to regulate based solely on the results of a 

conservative acute screening scenario which assumes that a 

person will be present at a specific location and during worstcase meteorological conditions. Rather, this initial screening 

scenario is used as a starting point in the assessment of the 

potential for acute effects. 

For HCl and Cl2, the acute REL values for the pollutants are 

not estimated to be exceeded even when using the screening 

scenario, and the acute REL for HF is estimated to be exceeded 

only by a factor of two for seven facilities using the screening 

scenario. The other cases of higher exceedances mentioned by the 

 

100 Memorandum from Science Advisory Board re: Review of EPA’s Draft at 6. 
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commenter are situations where the locations of the exceedances 

are on facility property and, therefore, not considered for 

public health. The acute REL is defined by CalEPA as “the 

concentration level at or below which no adverse health effects 

are anticipated for a specified exposure duration. RELs are 

based on the most sensitive, relevant, adverse health effect 

reported in the medical and toxicological literature. RELs are 

designed to protect the most sensitive individuals in the 

population by the inclusion of uncertainty factors which are 

incorporated to address data gaps and uncertainties. 

Regarding the use of AEGL and ERPG values, the EPA does not 

rely exclusively upon these values for assessment of acute 

exposures. Rather, the EPA’s approach is to consider various 

acute health effect reference values, including the California 

REL, in assessing the potential for risks from acute exposures. 

To better characterize the potential health risks associated 

with estimated acute exposures to HAP, and in response to a key 

recommendation from the SAB’s peer review of the EPA’s RTR risk 

assessment methodologies, we generally examine a wider range of 

available acute health metrics (e.g., RELs, AEGLs) than we do 

for our chronic risk assessments. This is in response to the 

SAB’s acknowledgement that there are generally more data gaps 

and inconsistencies in acute reference values than there are in 
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chronic reference values. In some cases, when Reference Value 

Arrays101 for HAP have been developed, we consider additional 

acute values (i.e., occupational and international values) to 

provide a more complete risk characterization. Because HCl, HF, 

and Cl2 all have 1-hour REL values, the maximum estimated 1-hour 

concentrations were compared to these values to assess the 

potential for acute health effects. 

Comment: One commenter expressed concern that the EPA’s 

risk analysis ignored exposures from emissions of HCl, HF, Cl2, 

and other pollutants with similar biological endpoints from 

units subject to the proposed work practice standards, including 

emissions during startup and shutdown, and emissions from BSCP 

periodic kilns and sanitaryware shuttle kilns. The commenter 

asserted that even though the EPA stated that the work practice 

standards are intended to minimize emissions, these sources are 

not included in the calculation of the CAA section 112(d)(4) 

standards, and exposures to emissions from these other sources 

will contribute to an individual’s cumulative health risks. The 

commenter asserted that the EPA does not know whether the 

proposed HBEL will provide “an ample margin of safety” once 

 

101 U.S. EPA. (2009) Chapter 2.9 Chemical Specific Reference Values for 

Formaldehyde in Graphical Arrays of Chemical-Specific Health Effect Reference 

Values for Inhalation Exposures (Final Report). U.S. Environmental Protection 

Agency, Washington, DC, EPA/600/R–09/061, and available on-line at 

http://cfpub.epa.gov/ncea/cfm/recordisplay.cfm?deid=211003. 
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emissions from periods of startup and shutdown and emissions 

from BSCP periodic kilns and sanitaryware shuttle kilns are 

added to the levels of pollution permitted by the proposed 

standards. For this reason, the commenter stated that the 

proposed CAA section 112(d)(4) standards are unlawful and 

arbitrary. 

The commenter also stated that emissions during startup and 

shutdown are expected to be uncontrolled, because the EPA did 

not propose to require that BSCP and clay ceramics plants use 

APCD or other methods to reduce emissions (such as mandating the 

use of clean fuels) during these periods. The proposed work 

practice standards for periodic and shuttle kilns do not require 

control technology and, according to the commenter, are not 

anticipated to reduce emissions. 

Finally, the commenter stated that the only reason startup 

and shutdown periods and periodic and shuttle kilns are not 

subject to the proposed CAA section 112(d)(4) limits is because 

the EPA exempted them from CAA section 112(d). The commenter 

stated that it is arbitrary to exclude those emissions from the 

health analysis solely because the EPA proposed to regulate 

those sources of emissions under a different subsection of the 

CAA. The commenter argued all exposures contribute to the risk 
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of harm, regardless of whether they are CAA section 112(d)-

regulated emissions or section 112(h)-regulated emissions. 

Response: The EPA disagrees that emissions during periods 

of startup and shutdown and emissions from BSCP periodic kilns 

and sanitaryware shuttle kilns will exceed the numerical HBEL. 

Regarding the standards for periods of startup and shutdown, as 

noted in the preamble to the proposed rule and further 

documented in Docket ID No. EPA-HQ-OAR-2013-0291,102 temperature 

is the main factor affecting full production at BSCP plants. The 

kiln cars should be introduced into the kiln at a steadily 

increasing push rate to facilitate development of that specific 

kiln’s firing temperature profile. Since emissions are generated 

from the firing of the bricks and the fuel combusted, the EPA 

has concluded that the maximum magnitude of emissions will occur 

when all kiln cars have been loaded with the maximum number of 

bricks and the maximum amount of fuel is used. During startup, 

kiln operators will limit production until the kiln has heated 

enough to begin normal operation. This is the point whereby the 

standard transitions from a work practice to a numeric limit. 

The opposite process occurs during shutdown. Fuel use will 

decrease significantly so as to cool the kiln, and kiln 

 

102 Email from Susan Miller, BIA, to Sharon Nizich and Keith Barnett, EPA. 

“Additional documents.” Dated June 25, 2015. 
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operators will slow production to a stop. Since emissions will 

be lower below this point of maximum loading and fuel use, 

emissions will not rise above the emission limit for all 

pollutants, including the acid gas limits. 

The owner or operator of each kiln will be required to 

determine the startup production rate for the kiln. For kilns 

with an APCD, the owner or operator will determine the minimum 

inlet temperature for the APCD. For kilns that, through 

compliance testing once the compliance date has been reached, 

have shown they are emitting under the emission limits and thus 

do not have an APCD, the owner or operator will determine the 

product-specific kiln temperature profile that must be achieved 

before the kiln can reach full production. The startup standards 

will be tied to the startup production rate never being exceeded 

until the kiln reaches the minimum inlet temperature for the 

APCD or the product-specific kiln temperature profile, whichever 

is applicable. During shutdown, once the kiln falls below the 

minimum inlet temperature for the APCD or the product-specific 

kiln temperature profile, whichever is applicable, no additional 

product can be introduced. These temperature limits will be 

required to be included in the facility’s records and kept on 

site. Thus, for periods of startup and shutdown, the HBEL set 
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for HCl, HF, and Cl2 will not be surpassed during startup and 

shutdown. 

In the case of sanitaryware shuttle kilns, the commenter is 

mistaken that we did not mandate the use of clean fuels. The 

rule does limit the fuels used to natural gas or equivalent, and 

also outlines work practice standards relative to temperature 

cycles and maintenance procedures designed to minimize HAP 

emissions (see Table 3 to subpart KKKKK). The use of clean fuels 

applies for all times the kiln is running, not just startup and 

shutdown. Therefore, the commenter is incorrect that we are not 

requiring the use of clean fuels for startup and shutdown 

relative to the operation of shuttle kilns. 

The EPA also disagrees that just because the proposed work 

practice standards for periodic and shuttle kilns do not reflect 

the use of any control technology, they are not anticipated to 

reduce emissions. As the commenter has stated elsewhere, control 

technologies are not the only means of limiting emissions. 

Control of parameters such as fuel, operating temperature, 

combustion conditions, and throughput are also effective means 

of limiting emissions, and these are the types of parameters the 

EPA considered when finalizing the work practice standards for 

periodic and shuttle kilns. 
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As discussed in the proposal at 79 FR 75662, CAA section 

112(h)(1) states that the Administrator may prescribe a work 

practice standard or other requirements, consistent with the 

provisions of CAA sections 112(d) or (f), in those cases where, 

in the judgment of the Administrator, it is not feasible to 

enforce an emission standard. Section 112(h)(2)(B) of the CAA 

further defines the term “not feasible” in this context to apply 

when “the application of measurement technology to a particular 

class of sources is not practicable due to technological and 

economic limitations,” which is the case here. There are fewer 

BSCP periodic kilns and first-fire sanitaryware shuttle kilns 

compared to tunnel kilns, and they tend to be low-emitting 

sources compared to tunnel kilns,103 so their emissions will not 

cause an exceedance of the health threshold. The work practice 

standards we are finalizing will serve to ensure that emissions 

from these sources continue to remain low. 

 

103 For example, even assuming that lb/ton emissions are similar for BSCP 

periodic and tunnel kilns, a comparison of annual kiln design capacities (ton 

product/yr) for model BSCP periodic kilns and tunnel kilns indicates that 

annual capacities for periodic kilns are on average only 5 percent of annual 

capacities for tunnel kilns. (For the basis of this calculation, see the 

memorandum “Updated Inventory Database and Documentation for Brick and 

Structural Clay Products Final Rule” in Docket ID No. EPA-HQ-OAR-2013-0291 

and the memorandum “Final Rule: Documentation of Database and Responses to 

the 1997 Information Collection Request for Brick and Structural Clay 

Products” in Docket ID No. A-99-30.) In addition, in the BSCP industry, there 

are currently 120 periodic kilns located at 15 facilities, compared to 169 

tunnel kilns at 85 facilities. In the sanitaryware industry sector, there are 

currently 5 first-fire shuttle kilns, compared to 11 first-fire tunnel kilns. 
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Comment: One commenter stated that, to create standards 

that assure “an ample margin of safety,” the EPA is required to 

build a margin into the HBEL for exposures to HCl, HF, Cl2, and 

other pollutants with similar biological endpoints resulting 

from (a) exceedances of the HCl, HF, and Cl2 standards, (b) 

violations of the work practice standards applicable during 

startup and shutdown, and (c) exceedances of other standards 

(e.g., MACT standards for non-Hg HAP metals) that restrict 

pollutants with similar biological endpoints. The commenter also 

stated that estimating short-term emissions by averaging annual 

emissions does not reflect emissions spikes that occur during 

plant malfunctions or upsets. The commenter stated that 

malfunctions and upsets increase emissions and thereby pose 

increased health risks that the EPA must consider. 

The commenter stated that relevant chronic exposures 

include exposures from exceedances and violations and noted that 

many exceedances, such as those from malfunctions and upsets, 

are likely to contribute significant emissions that can elevate 

an individual’s total exposures over time. The commenter also 

stated that the EPA explains malfunction events can be 

significantly higher than emissions at any other time of source 

operation (79 FR 75626). The commenter stated that these 

emissions pose much higher short-term risks and can accumulate 
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and combine to increase public health impacts and risk and that 

guarding against the health risks of releases of large amounts 

of HF (for example) must be built into the HBEL through the 

margin of safety. The commenter stated that HF exhibits 

characteristics in some circumstances that can make it uniquely 

hazardous over large areas. For example, HF molecules may 

associate with one another (i.e., form larger molecules like 

H4F4, H6F6, H8F8) via hydrogen bonding and such molecules may form 

a cloud that is heavier than air, therefore less likely to 

disperse. 

The commenter stated that, by not accounting for exposures 

from exceedances, the EPA assumed that such exceedances will be 

zero and built in no additional protections in case exceedances 

do occur. The commenter claimed that there is no factual basis 

for assuming that 100 percent of BSCP and clay ceramics 

facilities will comply with each of the relevant emissions 

limits 100 percent of the time. Over the long term and across 

the population of regulated facilities, the commenter noted that 

it is predictable that a number of exceedances will occur at 

facilities. The commenter stated it is unlawful to ignore 

emissions and the resulting health risks from those exceedances 

and argued the additional risk from exceedances should not be 

ignored in risk assessments. 
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The commenter stated that EPA regularly uses statistical 

methods and probability factors to assess health risk due to 

exceedances and to set clean air standards, and the EPA has data 

available to calculate representative factors to assess the 

health risk from malfunctions or can collect information on 

major sources’ malfunction and violation histories.104 If the EPA 

needs more refined data regarding these emissions, the commenter 

suggested the EPA may request additional data from sources. 

The commenter stated that it is irrelevant that exceedances 

are a result of a failure to comply with the law when the EPA is 

setting CAA section 112(d)(4) standards, which must be set at a 

level that protects health. It does not matter to a person 

whether the pollution he or she is breathing is a result of a 

permitted or unpermitted release; the commenter argued the EPA 

cannot turn a blind eye to the reality that compliance with its 

standards is not perfect. 

Response: The HBEL was determined based on the assessment 

of acute affects at the worst-case facility with respect to 

meteorology and distance to receptor and is protective of most 

facilities even if they had SSM event emissions. Even for the 

worst-case facility, the SSM emissions event would need to be 

 104 See, e.g., EPA, Enforcement and Compliance History Online (ECHO), 

www.epa.gov/echo. 
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coincident with the worst-case meteorological conditions, which 

is not likely if SSM events are not frequent. For chronic risk, 

SSM emissions are not significant compared to the HBEL level, 

and most facilities are well below an HI of one with emissions 

at the HBEL level. 

The commenter is correct that the EPA did not include 

malfunctions and upsets emissions in setting emissions limits. 

As noted in the preamble to the proposed rule (79 FR 75626), 

malfunctions “are, by definition sudden, infrequent and not 

reasonably preventable failures of emissions control, process or 

monitoring equipment.” The preamble also stated that “accounting 

for malfunctions in setting emission standards would be 

difficult, if not impossible, given the myriad different types 

of malfunctions that can occur across all sources in the 

category and given the difficulties associated with predicting 

or accounting for the frequency, degree and duration of various 

malfunctions that might occur. For these reasons, the 

performance of units that are malfunctioning is not ‘reasonably’ 

foreseeable.” It should also be noted that sources cannot 

conduct performance tests during periods of malfunction (40 CFR 

63.8445(e) and 40 CFR 63.8595(d)) and there are no CEMS in place 

in the BSCP industry. 
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The EPA disagrees that it is required to evaluate the ample 

margin of safety provided by a CAA section 112(d)(4) standard 

based on the level of emissions that could occur during an 

exceedance of the standard caused by a malfunction or any other 

cause. When the EPA establishes a standard under CAA section 

112(d)(4), the EPA evaluates the ample margin of safety based on 

what sources will emit when they are meeting the standard (which 

applies at all times including periods of malfunction) and does 

not include some additional margin of safety to compensate for 

periods of time that sources may violate the standard. This is 

consistent with how the EPA evaluates standards under CAA 

section 112(f)(2) (in that the EPA’s evaluation of the ample 

margin of safety under that review looks at the emissions 

allowed under the standard, not emissions that might occur when 

the standard is exceeded). 

Regarding the comment that the standard is not health 

protective for emissions of HF, the proposed rule determined the 

HCl equivalent emissions for HF by the ratio of the RfC value 

for each pollutant, such that a 250 tpy emission of HCl is 

equivalent to 175 tpy emissions of HF. By performing a risk 

analysis for each facility/kiln, the EPA demonstrated that these 

emissions limits are protective of both chronic and acute risks. 
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Regarding the comment that HF exhibits release 

characteristics that may make it uniquely hazardous over large 

areas, the EPA notes that in our analysis, emissions were 

treated as gases for dispersion modeling purposes. At ambient 

concentrations the emissions of these acid gases exhibit 

dispersion behavior equivalent to ambient air. Further, this 

modeling approach is health protective by not allowing mass to 

be removed from the plume from direct contact with the ground 

and biota. 

7. Other Issues

Comment: One commenter stated that the EPA must account for 

the variability in emissions measured by compliance testing to 

measure whether each plant’s emissions meet the HBEL because 

that testing does not capture a source’s variance in emissions 

performance over time. The commenter noted that the EPA already 

recognizes this fact for stack tests for technology-based 

standards. The EPA has stated that it lacks a high degree of 

confidence that stack tests capture variation in emissions over 

time, and the commenter noted that as a result of this variance, 

it can be expected that the compliance tests would not be 

accurate. The commenter asserted that if the EPA believes that 

measurement variability needs to be corrected for, then it is 

irrational and arbitrary to correct for it with one set of 
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standards (MACT standards) and not another (health-based 

standards), when they both rely upon emissions data from stack 

tests. The commenter noted that the EPA’s proposal to account 

for variability for MACT standards but not for compliance with 

the HBEL would result in weaker and less-protective standards in 

both cases.

Response: Variability in emissions would not have a 

significant impact on the estimated risks associated with the 

HBEL. For chronic exposures and risks, the estimates are based 

on long-term (annual) emissions, so short-term emissions 

variability would not impact the estimates of chronic risks as 

long as the annual emissions, on average, do not exceed the 

limit. For acute exposures and risks, short-term emissions 

variability that causes emissions to exceed the 1-hour HBEL 

would increase the potential for acute health effects, but the 

likelihood of such effects is low because the emissions 

variability would have to occur at the small number of 

facilities we estimated as having the highest acute HQs based on 

the emissions limits, and the emissions variability would have 

to coincide with worst-case meteorological conditions even at 

those facilities to result in acute HQs higher than those we 

estimated based on the HBEL. Most facilities have acute HQ 

estimates significantly below one, so short-term emissions 
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variability would have to be high (approximately 60 percent 

higher for the median facility) for the estimated HQs to 

approach a value of one. 

The EPA also notes that the HBEL was not established using 

emissions data from stack tests. Therefore, there was no need to 

account for variability in setting the HBEL as was done for the 

Hg and non-Hg HAP metals standards. Instead, the standard was 

established at a conservative level to ensure that the HQs 

remain below one for all facilities. The EPA agrees that there 

would be variability in the test results used to demonstrate 

compliance with the rule, but as already noted in this response, 

short-term emissions variability would have to be high for the 

estimated HQs to approach a value of one. In addition, 

variability is not considered when comparing compliance testing 

results to any other emissions limit, so it would be 

inconsistent for the EPA to require owners and operators to 

adjust their test results before comparing those results to the 

HBEL. 

Comment: One commenter suggested that the EPA should 

require fence-line ambient air quality monitoring that measures 

multiple pollutants in real-time or near real-time to ensure 

that people are not being exposed to ambient pollutant 

concentrations that exceed the proposed HBEL. The commenter 
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recommended the EPA also require real-time public reporting of 

the monitoring data. 

In addition, the commenter suggested that the EPA should 

require facilities to submit monitoring plans, data, and 

corrective action plans for agency review and public comment. 

These requirements would ensure concerned community members have 

the ability to review and recommend improvements to monitoring 

plans before they are implemented and would enable the EPA to 

consider community concerns when deciding whether to approve a 

plan. 

Response: The EPA disagrees with the commenter. Because 

stack emissions can travel for long distances and are at heights 

above where a fence-line monitors would measure, it is 

inappropriate to use fence-line monitoring for stack emissions. 

Fence-line monitoring is performed for fugitive emissions (see 

discussion of fence-line monitoring use on fugitive emissions at 

79 FR 36919, Petroleum Refinery Sector Risk and Technology 

Review and New Source Performance Standards; Proposed Rule). In 

response to the comment that the EPA should require all 

facilities to submit monitoring plans, data, and corrective 

action plans for agency review and public comment, the EPA notes 

that these requirements are indeed in the rule, as facilities 

are required to submit monitoring plans, data and corrective 
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actions for the regulatory agency review. However, in most 

cases, these submissions are required to be sent to the 

delegated authority, and the follow-up to that review, is left 

to the discretion of the delegated authority. 

B. BSCP Manufacturing NESHAP 

1. MACT Floors 

a. Sources in MACT Floor Pool 

One commenter stated that the D.C. Circuit held that the 

BSCP Manufacturing NESHAP published on May 16, 2003 (68 FR 

26690) violated the CAA in a number of ways (Sierra Club v. EPA, 

479 F.3d 875 (D.C. Cir. 2007)). The court held that, in setting 

MACT floors for brick tunnel kilns, the EPA’s exclusion of kilns 

employing non-DLA controls from its ranking and identification 

of the best performing sources was unlawful because CAA section 

112(d)(3) “requires floors based on the emission level actually 

achieved by the best performers (those with the lowest emission 

levels).” Id. In addition, the court recognized that factors 

other than pollution control technology affect performance 

(e.g., clay type), and the EPA cannot ignore such factors, even 

where the EPA finds that floors based on those factors would be 

unachievable. 

The commenter noted that the EPA is once again excluding 

best performing sources from its floor analysis and basing 
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floors on a group of kilns using the EPA’s preferred control 

technologies, in contravention of the holding of Sierra Club, 

which is the decision to which this rulemaking is intended to be 

a response. In the proposed rule, prior to ranking the best 

performing sources for the BSCP tunnel kiln floors for PM (as a 

surrogate for non-Hg HAP metals) for existing and new sources, 

the EPA removed all kilns without a FF-based APCD. Once removed, 

those kilns were not included in the ranking of best performing 

sources, and hence they were not considered for inclusion among 

the best performing 12 percent of sources (for the existing 

source floor) or the best controlled similar source (for the new 

source floor). The commenter asserted that the agency’s reprisal 

of a floor approach that the D.C. Circuit has already rejected 

repeatedly is not just unlawful, but amounts to contempt for the 

court’s authority. 

Response: The EPA disagrees with the commenter’s assertion 

that the EPA’s proposed approach to calculating PM surrogate 

MACT floors for kilns was illegal in that it impermissibly 

excluded certain kilns. However, at proposal, we asked for 

comment on this approach and requested additional data to 

support this approach, and we did not receive any such 

additional data. In addition, some of the test data for sources 

with FF-based APCD could not be used in the final rulemaking 
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because it was discovered that the testing was not carried out 

in accordance with the appropriate test method. Therefore, we 

can no longer assert that we have emissions data for all BSCP 

kilns with FF-based APCD. Thus, the EPA did not use the approach 

challenged by the commenter to establish the MACT floors in the 

final rule. 

The EPA has amended the approach to developing PM surrogate 

MACT floors for reasons explained in section IV.A.1 of this 

preamble, so these comments are now moot. However, the EPA still 

believes the approach to identify the best performing sources 

has merit. When the EPA has data on every single controlled 

source in the category, and these data support that these 

sources are the best performing, then basing the MACT floor on 

the top 12 percent of the total number of sources is 

appropriate. 

b. Equivalent Limits 

Comment: One commenter stated that, in addition to the 

lb/ton MACT floors for emissions of Hg and PM (as a surrogate 

for non-Hg HAP metals), the EPA developed two “equivalent 

limits.” The EPA used its ranking of the sources based on their 

“average” lb/ton emissions to identify the best performing 

source or sources for the floor pool. To develop the PM and Hg 

“equivalent” limits, the EPA took the best performing source or 
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sources the EPA had selected and retrieved data on those 

sources’ emission performance as measured by gr/dscf at 7 

percent O2 for PM and Hg and lb/hr for Hg. For non-Hg HAP metals, 

the EPA proposed to set an additional standard that would limit 

the pounds of non-Hg HAP metals emitted per hour. For this 

additional limit, the EPA again used the ranking of the sources 

based on their “average” lb/ton emissions and also (without any 

explanation) no longer used PM as a surrogate for non-Hg HAP 

metals, but instead set the limit in terms of total non-Hg HAP 

metals. The commenter stated that the EPA acknowledged that the 

available data on non-Hg HAP metals is incomplete, so to develop 

this proposed limit, the EPA simply took the final pounds of PM 

per ton of fired product floor limit that it had derived and 

applied a set of “conversion factors” it invented to put that 

standard in terms of pounds of non-Hg HAP metal emissions per 

hour. The commenter stated the EPA used completely different 

“conversion” methodologies for the new and existing standards 

because the EPA lacks even the limited data it used for the 

existing source methodology on new sources. 

The commenter stated the “equivalent” limits the EPA 

proposed are not “equivalent” and Congress did not give the EPA 

the authority to set multiple limits and allow sources to comply 

with whichever limit they choose. The commenter stated the EPA’s 
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use of different measures of performance to identify the top 

sources on the one hand and to evaluate their performance on the 

other is inconsistent, irrational, and unexplained; the same 

metric should apply for purposes of identifying the best 

performers and identifying those sources’ actual performance. 

The commenter also stated the EPA did not use the best 

performing 12 percent of existing sources “for which the 

Administrator has emissions information” for the non-Hg HAP 

metals lb/hr limit. 

Another commenter supported the EPA’s inclusion of multiple 

formats for both PM/non-Hg HAP metals and Hg. The commenter 

stated that the inclusion of each of these formats, as well as 

the inclusion of small and large kiln subcategories, provides 

needed flexibility to numerous BSCP facilities, including a 

large number of small businesses, to find that standard that 

best suits their operations while still ensuring that the CAA 

requirements are met. The commenter asserted that the inclusion 

of three alternate compliance formats is so critical to the 

development of this standard that the EPA must re-propose this 

rule if it maintains numeric limits but deletes any of these 

alternative formats for the final rule. 

Response: The EPA appreciates all comments regarding the 

alternative limits. The EPA is retaining the alternative limits 
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in the final rule but is revising the ranking methodology as 

described in section IV.A.2 of this preamble. For the final 

rule, the concentration floor is based on the ranking of the 

concentration data, and the lb/hr floor is based on the ranking 

of the lb/hr data. Each floor is based on the best performing 

units for that unit of measurement. 

c. Oxygen Correction 

Comment: One commenter stated, regarding the concentration 

compliance limits, that the use of the equation to correct 

measured concentrations to 7 percent O2 could be problematic when 

used to correct concentrations measured in stacks with high 

oxygen content, which is typical of the brick industry. The 

commenter stated because the correction term is in the 

denominator of the equation for the correction to 7 percent O2, 

the overall correction factor increases exponentially as O2

concentrations approach 20.9 percent. As a result, any variances 

in the oxygen measurement are greatly magnified in the 

correction factor for kilns with high stack oxygen content. The 

commenter suggested that the correction factor should be the 

average oxygen content represented in the respective floors, 17 

percent O2 (based on a range of oxygen stack contents for BSCP 

kilns from 13 to 20 percent). The commenter asserted that the 
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correction to an average of 17 percent will minimize the 

artificial inflation of the results for the industry. 

Response: The EPA evaluated the oxygen content of the runby-run datasets of PM and Hg for BSCP tunnel kilns as described 

in section IV.A.1 of this preamble and agrees that correcting 

concentration data to 17 percent O2 rather than 7 percent, as 

proposed, provides more representative values of kilns’ 

operating conditions and would not artificially inflate the 

values. For the final rule, the EPA has taken the O2 percent 

analysis into consideration and revised the equivalent 

concentration based limits to be developed from 17 percent O2-

corrected concentration data. 

2. Startup and Shutdown 

Comment: Numerous commenters supported the use of work 

practice standards for periods of startup and shutdown but 

asserted that the startup and shutdown procedures listed in the 

proposed rule cannot be met by all BSCP kilns and must be 

modified. Commenters requested that the final language allow a 

more basic construct for the work practice requirements in the 

final rule and require facilities to develop site-specific 

temperatures as part of their permitting process. 

Multiple commenters specifically stated that the 

requirement for an exhaust temperature of 400 °F at startup is 
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not workable because the kiln exhaust temperature in some kilns 

never reaches 400 °F. Commenters also noted that kilns must have 

product at startup. Therefore, commenters requested that the 

startup provisions apply to the introduction, or charging, of 

new brick or structural clay product through a kiln and not 

impact the initial staging of kiln cars in a kiln before startup. Commenters suggested revisions to the proposed language to 

“not put any bricks into the kiln” below specified temperatures. 

Multiple commenters agreed with the language that requires 

a kiln to vent to an APCD before the exhaust gas reaches 400 °F, 

because it can vent at any time up to that temperature. Multiple 

commenters stated that for a controlled kiln, it is acceptable 

to require that no new product is allowed to be introduced to 

the controlled kiln until the kiln is vented to an APCD. One 

commenter stated that a feasible work practice standard would be 

for the exhaust gases to be vented through the APCD during the 

startup process, with the reagent feed started on an 

intermittent basis during this period and then brought up to 

full feed rate once the exhaust temperature has reached the 

normal operating temperature range. 

A few commenters also requested specific revisions to the 

production requirements for periods of shutdown. One commenter 

stated that during shutdown, a kiln operator would not be 
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pushing any cars in the kiln after reaching a range of 250 to 

300 °F in the exhaust stack (depending on the type of kiln and 

its operating parameters). The commenter asked that a minimum 

operating range be allowed during a shutdown cycle. Another 

commenter noted that a limitation for a kiln to cease charging 

in new product before a kiln stops venting to an APCD may be a 

reasonable alternative to temperature requirements. 

Response: The EPA evaluated the comments and additional 

information received following proposal as described in section 

IV.A.4 of this preamble. As a result, the EPA has revised the 

work practice standards for periods of startup and shutdown for 

BSCP tunnel kilns to provide requirements that are more 

representative of the best performing kilns. Specifically, 

instead of defining the minimum inlet APCD temperature as 400 

°F, the EPA is requiring the owner or operator to determine the 

minimum inlet temperature for each APCD. If a kiln does not have 

an APCD, the owner or operator is required to determine the 

product-specific kiln temperature profile that must be achieved 

before the kiln can reach full production. In addition, instead 

of specifying that no product can be introduced to the kiln 

during startup, the EPA is requiring the owner or operator to 

determine the production rate needed to start up the kiln. The 

final startup standards specify that this startup production 
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rate cannot be exceeded until the kiln exhaust reaches the APCD 

minimum inlet temperature or the product-specific kiln 

temperature profile, whichever is applicable. The final shutdown 

standards specify that no additional product can be introduced 

once the kiln exhaust falls below the APCD minimum inlet 

temperature or the product-specific kiln temperature profile, 

whichever is applicable. 

C. Clay Ceramics Manufacturing NESHAP 

1. Authority 

Comment: Two commenters argued that the EPA has no legal 

authority to finalize major source NESHAP for the ceramic tile 

manufacturing industry105 because there are currently no existing 

major sources in that industry sector that will be subject to 

the standards. Specifically, they argued that CAA section 

112(d)(1) only provides the EPA authority to regulate a category 

or subcategory if it has major sources. Commenters contended 

that, here, ceramic tile manufacturing facilities that emit HAP 

have all become synthetic area sources and so are subject to the 

“area source” NESHAP regulation. Thus, they argue, the law does 

not allow the EPA to proceed with a major source standard for 

 

105 There are three distinct sectors within the clay ceramics manufacturing 

industry: ceramic floor tile manufacturing, ceramic wall tile manufacturing, 

and sanitaryware manufacturing. These comments address the regulation of 

hazardous air pollutant emissions from ceramic floor tile manufacturing and 

ceramic wall tile manufacturing. 
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these subcategories. Both commenters also stated that the CAA 

does not give the EPA the authority to regulate “just-in-case” 

there is a major source in the future, and the EPA may only 

regulate categories and subcategories that currently have major 

sources in them. 

One commenter stated that the EPA should not devote 

resources to finalizing these regulations when those regulations 

would apply to no one, and thus will have no environmental 

benefits. The commenter stated that it is the EPA’s duty to 

responsibly steward the public resources with which it has been 

entrusted to use in fulfillment of its mission, and using these 

resources to issue regulations that will regulate no one fails 

to satisfy that responsibility. Issuing such regulations is 

expensive for the regulated community and has the real potential 

to create unintended, inaccurate impressions of the industry, 

its emissions and its products. It serves no public purpose, and 

will impose short and long term costs on the EPA, and long term 

costs on delegated states as an unfunded mandate and on the tile 

manufacturing industry, 79 FR 75671 (Dec. 18, 2014). 

The commenter argued that, because the EPA’s promulgation 

of standards for the ceramic tile industry is not authorized by 

the CAA, finalizing such standards would violate Articles I and 

II of the U.S. Constitution because it is an attempt by the EPA 
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to rewrite portions of the CAA when the power to enact laws is 

reserved to Congress. The commenter stated that Congress 

provided clear instructions to the EPA, in the unambiguous 

numerical definition of “major source,” as to which industry 

categories or subcategories could be regulated by major source 

NESHAP standards. The commenter noted that the Supreme Court 

very recently stated: “An agency may not rewrite clear statutory 

terms to suit its own sense of how the statute should operate.” 

Util. Air Regulatory Grp. v. EPA, 134 S.Ct. 2427, 2446 (2014). 

Further, the Court stated: “We are not willing to stand on the 

dock and wave goodbye as EPA embarks on a multiyear voyage of 

discovery.” 134 S.Ct. at 2446. The commenter asserted that the 

Supreme Court’s concerns in the UARG case are instructive here 

because, as in the UARG case, the statute creates unambiguous 

numeric thresholds defining a major source: the emission of 10 

tpy any one HAP or the emission of 25 tpy in the aggregate of 

all HAP, 42 U.S.C. 9612(a)(l). The commenter contended that the 

Supreme Court supported the commenter’s position when it stated 

that “[i]t is hard to imagine a statutory term less ambiguous 

than the precise numerical thresholds...” Id. at 2445. 

The commenter argued that the Sierra Club Consent Decree is 

irrelevant to the EPA’s statutory authority and its limitations. 

The Consent Decree entered in the case of Sierra Club v. EPA, 
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850 F.2d 300 (D.D.C. 2012) (hereafter the “Consent Decree”) is 

germane to the timing of this rulemaking, but it does not, and 

legally could not, expand CAA section 112(d) to grant the EPA 

legal authority to regulate on the just-in-case basis the EPA 

has proposed. The withdrawal of the proposed NESHAP does not 

preclude the EPA from meeting its statutory obligations, 

fulfilling the requirements of the Consent Decree, and 

continuing its existing precedent. The EPA may issue final 

NESHAP for those subcategories within this category in which a 

major source exists. The ceramic tile manufacturing industry is 

not among them. 

The commenter argued that the proposed NESHAP would, if 

finalized as proposed, be arbitrary and capricious because the 

proposed NESHAP is based on hypothetical or imaginary 

manufacturing and air emissions control strategies, flawed data 

from an unvalidated stack test method, and on statistically 

created emissions data. The EPA even proposed in places not to 

use actual emissions data. 

According to the commenter, the EPA’s proposal, if 

finalized, would create an economic hurdle so high that no one 

in the industry would expand their business to the point of 

becoming a NESHAP major source. Further, a substantial number of 

these entities meet the definition of a “small business” as 
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defined by the U.S. Small Business Administration (SBA). The 

result of this regulation, if finalized, would be to hand nonmarket-based economic advantages to foreign producers to grow 

their presence in the U.S. market by importing their competing 

ceramic tile. Financing of capital projects will be adversely 

affected by the costs imposed by the NESHAP, further raising the 

economic hurdle. Major source domestic manufacturing capacity 

will not be built, and the jobs and tax base that go along with 

that capacity will not be created. 

Response: Under CAA section 112(c)(1), the EPA first lists 

all categories and subcategories of major sources. It is at this 

first step that the EPA determines that a given category or 

subcategory contains major sources of HAP. Then, the EPA sets 

standards for those listed categories and source categories. 

Both CAA section 112(c)(2) and section 112(d)(1) make clear that 

the EPA is to regulate all listed categories and subcategories. 

As CAA section 112(c)(2) states: “For the categories and 

subcategories the Administrator lists, the Administrator shall 

establish standards...” As CAA section 112(d)(1) states: “The 

Administrator shall promulgate regulations establishing 

emissions standards for each category and subcategory of major 

sources and area sources of hazardous air pollutants listed for 

regulation pursuant to subsection (c) of this section...” In 
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short, once a category or subcategory of major sources is listed 

under CAA section 112(c), it must be regulated. If commenters 

believe that the major source ceramic tile subcategories should 

not be regulated, they may seek to delete these subcategories 

from the list, which is a process that Congress established in 

CAA section 112(c)(9) and which the D.C. Circuit has held is the 

EPA’s sole authority for removing a listed category or 

subcategory from the list. New Jersey v. EPA, 517 F.3d 574, 581-

583 (D.C. Cir. 2008). 

In interpreting the relevant provisions here, the EPA is 

mindful of the recent and longstanding instructions from the 

Supreme Court that statutory provisions must be read to further 

rather than undermine Congress’s statutory intent. King v 

Burwell, 2015 U.S. Lexis 4248, *29 (2015)(“We cannot interpret 

federal statutes to negate their own stated purposes.”)(citing 

and quoting New York State Dept. of Social Servs. v. Dublino, 

413 U. S. 405, 419-420, 93 S. Ct. 2507, 37 L. Ed. 2d 688 

(1973)); E.I. Du Pont De Nemours v. Train, 430 U.S. 112, 132 

(1977)(“We cannot, in these circumstances, conclude that 

Congress has given authority inadequate to achieve with 

reasonable effectiveness the purposes for which it has 

acted.”)(quoting Permian Basin Area Rate Cases, 390 U.S. 747, 

777 (1968)). In this context, it is unreasonable to read CAA 
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section 112(d)(1) as limiting the EPA’s authority to set 

standards that will be applicable to the highest emitting 

sources in a category or subcategory and creating a loophole by 

which major sources can evade regulation. Without suggesting 

that the following is the commenters’ intent, the effect of the 

commenters’ interpretation of CAA section 112 would be that 

major sources would be able to evade regulation by, first, 

becoming synthetic area sources during the rulemaking process 

(which, under the commenters’ view, would preclude the EPA from 

finalizing standards for major sources) and then, after the EPA 

withdraws the proposed standards, reconverting to be major 

sources and thus not subject to any standard. Consideration of 

this scenario is particularly appropriate in the circumstances 

here, because there are standards in place for area sources in 

the ceramic tile subcategories. It is not reasonable to 

interpret CAA section 112 to create a structure where an area 

source (whether a natural area source or a synthetic area 

source) has an incentive to increase emissions to become a major 

source, and by doing so is no longer subject to emissions 

limitations. 

Further, the issue of whether there are major sources in 

the ceramic tile subcategories is not as clear as the commenters 

presume. Even if, as the commenters contend, all of the existing 
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major sources in these subcategories have successfully completed 

the process of becoming synthetic area sources, then these 

sources are not subject to the requirements imposed on major 

sources but that does not equate to a conclusion that they are 

no longer major sources in any respect. The EPA’s view is that 

synthetic area sources, though subject to area source 

requirements rather than major source requirements, are still 

major sources in certain respects. For example, synthetic area 

sources are considered to be major sources when the EPA 

identifies the best performing major sources as part of a MACT 

floor calculation under CAA section 112(d). Further, CAA section 

112(a)(1) defines a major source as “any stationary source or 

group of stationary sources located within a contiguous area and 

under common control that emits or has the potential to emit 

considering controls, in the aggregate, 10 tons per year or more 

of any hazardous air pollutant or 25 tons per year or more of 

any combination of hazardous air pollutants.” The reference to a 

source's “potential to emit considering controls” in this 

definition allows the interpretation that a source's potential 

to emit before and after controls is relevant, such that 

synthetic area sources may be considered within the meaning of 

this definition. 
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With respect to the commenter’s argument that CAA section 

112 does not authorize “just in case” regulation, that is both 

not correct and off point. First, CAA section 112 clearly 

provides that the EPA will set standards for new sources in the 

listed categories and subcategories notwithstanding that the EPA 

can never know whether there will actually be any new sources. 

As required under CAA section 112, the EPA establishes new 

source standards “just in case” (to use commenter’s phrasing) 

new sources come into existence. Second, as discussed above, it 

is reasonable for the EPA to promulgate major source standards 

where, as here, there are synthetic area sources that could 

revert to major sources just in case that happens. 

With respect to the commenters’ argument that it is a poor 

use of agency resources for the EPA to finalize standards for 

the ceramic tile subcategories, the EPA has considered whether 

it is better to complete the current rulemaking with respect to 

the ceramic tile subcategories (and have them in place in the 

event that there are new major sources or a synthetic area 

source reverts to major source status) or to take no action now 

and re-do this rulemaking with respect to these subcategories in 

the event that there are major sources in the future. The EPA’s 

conclusion is that, having gotten this far along in the 

rulemaking process, it is a better use of agency resources to 
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finalize requirements for the ceramic tile subcategories now. 

Given the options, finalizing these requirements in this 

rulemaking requires only a modest amount of additional 

resources, and is a much more efficient use of agency resources 

than restarting and repeating the rulemaking process at some 

point in the future. Even if one considers that there may not be 

any major sources that become subject to these requirements and 

that such a rulemaking might not ever be done, the EPA’s 

judgment is still that it is more efficient and a more costeffective use of agency resources to finalize these requirements 

now. Finally, on the issue of how likely it is that major 

sources will be built in the future, the EPA notes that the 

commenters’ own arguments suggest they will be. Specifically, 

the commenters stated that having a major source standard in 

place will dissuade companies from expanding small facilities 

into major sources and will impede financing for new major 

sources. The premise of such a comment is that, in the absence 

of a standard, there will be such expansions and new major 

sources. 

The document “National Emission Standards for Hazardous Air 

Pollutants for Clay Ceramics Manufacturing: Background 

Information for Final Rule - Summary of Public Comments and 
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Responses” in Docket ID No. EPA-HQ-OAR-2013-0290 addresses 

additional comments on this topic. 

Comment: According to one commenter, the EPA failed to 

demonstrate that the benefits of this proposed arbitrary and 

capricious NESHAP justify the costs. As stated in Executive 

Order 13563, “Improving Regulation and Regulatory Review,” 

issued by President Obama on January 18, 2011 to reaffirm 

Executive Order 12866, “[e]ach agency must ... propose or adopt 

a regulation only upon a reasoned determination that its 

benefits justify its costs.” The preamble to the proposed NESHAP 

provides cost information (which the commenter noted elsewhere 

is erroneous) but did not discuss the benefits. The EPA only 

articulated the benefits of the BSCP Manufacturing NESHAP. With 

respect to costs, the EPA’s cost analysis failed to account for 

costs to the agency and delegated states to promulgate and 

implement the regulations. There are no benefits to justify any 

of these costs. Further, “[i]n deciding whether and how to 

regulate, agencies should assess all costs and benefits of 

available regulatory alternatives, including the alternative of 

not regulating.” The EPA did not assess the alternative of not 

regulating – a path that would have exactly the same result, as 

there are no major sources to be regulated or not regulated. 

Therefore, the commenter stated that the EPA failed to meet its 
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burden; the proposed NESHAP does not have benefits justifying 

its costs, and therefore such a regulation cannot be adopted. 

Response: We disagree with the commenter. First, CAA 

section 112 clearly states that the EPA is obligated to regulate 

emissions of HAP from listed source categories. There is no 

benefits test in the statutory requirement. The language in 

Executive Order 12866 does not supersede a clear legal 

requirement in the CAA. Second, because there are no major 

sources that will be regulated by this rule at the present time, 

there will be no implementation costs for the rule. If at a 

later date a major source is constructed, or a non-major source 

becomes major, then there will be implementation costs, but this 

rule will result in emission reduction requirements compared to 

the emissions that would be expected to occur in the absence of 

a rule. Therefore, at the point where this rule actually results 

in costs, it will also have corresponding benefits. In the 

absence of any current major sources that will be covered by 

this rule, we simply cannot calculate the benefits. 

2. MACT Floors 

Comment: One commenter disagreed with the inclusion of 

emissions data from Kohler’s South Carolina facility tunnel kiln 

with the wet scrubber in the sanitaryware tunnel kiln existing 

source data pool for MACT floor determination. The commenter 
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stated that Kohler installed a new tunnel kiln at the South 

Carolina facility in 2005 under the Clay Ceramics Manufacturing 

NESHAP promulgated in 2003, which, according to the commenter, 

required the installation of APCD on any new first-fire tunnel 

kilns to meet the HF and HCl emission limitations. The APCD that 

Kohler installed, a wet scrubber, was written into the 

facility’s air permit at the time, and so its use at that time 

was federally enforceable. The court vacated the Clay Ceramics 

Manufacturing NESHAP in 2007, and the South Carolina Department 

of Health and Environmental Control revised the facility’s air 

permit in March 2009, removing any reference to the Clay 

Ceramics Manufacturing NESHAP and any requirement to operate the 

scrubber. Kohler then permanently shut down the scrubber in 

March 2009, though they continued to operate the tunnel kiln per 

permit requirements. Due to cost considerations, the scrubber 

was abandoned in place and not demolished/removed. 

The commenter noted that, when the EPA issued the ICR for 

clay ceramics emissions test data in 2010, the EPA required that 

Kohler make operational that wet scrubber for emissions testing 

of that tunnel kiln, even though the APCD was not listed in any 

permit nor required under any rule and had not been operated in 

17 months. Initially, Kohler agreed to test the kiln as an 

existing source per operational requirements in the facility’s 
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air permit (i.e., without the wet scrubber). However, the EPA 

demanded that Kohler restart and operate the abandoned scrubber 

during the kiln’s emissions testing. The commenter noted that 

Kohler cooperated with the EPA and tested emissions with the 

scrubber operating, but the scrubber was immediately shut down 

after testing. This scrubber has operated for a total of 1 week 

in the past 6 years, and that short period of operation was only 

to comply with the EPA’s ICR testing demand. 

The commenter acknowledged that the EPA has the authority 

require operation of any permitted source for emissions testing 

under rulemaking and ICR protocol. The commenter agreed with the 

EPA that the “kiln” in question is an existing source but 

disagreed that the non-operating wet scrubber qualifies as part 

of an existing source. The commenter contended that the EPA is 

arbitrarily penalizing Kohler for not spending the money to 

demolish and remove the wet scrubber back in 2009 when it was 

removed from the facility’s air permit. The commenter asserted 

that the test data from the wet scrubber are not representative 

of any existing source and were not actually achieved in 

practice over time. Therefore, using the test data in the MACT 

floor analysis is inconsistent with the EPA’s expressed intent 

to determine MACT floors for existing sources based on the 

average emissions actually achieved in practice by the best 
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performing sources with consideration for variability in 

emissions over time. The commenter asserted that all emissions 

data from the wet scrubber should be excluded from the existing 

source data pool for MACT floor analysis, and the existing 

source floors should be recalculated for the remaining existing 

sources. 

Response: Data from the APCD the commenter refers to was 

considered in developing both the new and existing MACT floors 

for sanitaryware kilns. As stated by the commenter, the APCD was 

installed to comply with the previously promulgated Clay 

Ceramics Manufacturing NESHAP and thus was an available data 

point for collection through the CAA section 114 data collection 

process for this rulemaking. Because this source had an 

operational APCD (even though it was not being operated), we 

believe that testing with the APCD operating would be most 

representative of the source’s best performance as defined in 

the CAA. Having collected the emissions data for the source with 

the APCD operating, the EPA considered the data consistent 

with section 112(d)(3)(B) of the CAA, under which the 

Administrator is required to calculate “the average emission 

limitation achieved by the best performing 5 sources (for which 

the Administrator has or could reasonably obtain emissions 

information) in the category or subcategory for categories or 
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subcategories with fewer than 30 sources.” Since it is 

appropriate to include the data in the database available to 

determine MACT floors, it is appropriate to use these data in 

floor calculations, if it is actually part of the best 

performing facilities. We note, however, that the data from this 

device was only significant for the existing source dioxin/furan 

MACT floor, for reasons that are dependent on each regulated 

pollutant and discussed as follows. 

For both new and existing PM MACT floors, the final limit 

was unaffected by use of these data, since the data from the 

APCD was not ranked in the top 5 sources with data. 

For both new and existing Hg MACT floors, the data from the 

APCD were not ranked because the data were invalidated. The data 

were removed from the dataset because of errors in the 

analytical procedures surrounding the digestion process as 

dictated by Method 29. See Section 4.1: Analytical discrepancy 

of the Test Report “Kohler Co., Spartanburg, SC: Tunnel Kilns 

and Glaze Spray Booths 08/11-17/2010 Stack Test,” Docket Item 

No. EPA-HQ-OAR-2013-0290-0069. 

For dioxin/furan, the data from the APCD are in the top 5 

but is not the best performing unit based on the dioxin/furan 

ng/kg ranking. (Note the units of measure for dioxin/furan 

ranking have changed from the proposed ng/dscm at 7 percent O2 to 
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ng/kg.) For the existing source floor, the result of the 

calculation of the best performing 5 sources is 3.3 ng/kg with 

the data point, and would have been 4.0 ng/kg without the data 

point, which we consider a nominal difference. The difference 

does not result in any source having to add controls. The 

calculation of the new source floor was not affected by the data 

from the APCD because, as stated above, the source was not the 

best performing unit, and the new source floor is based on the 

best performing unit. 

Comment: Three commenters questioned EPA's decision to 

propose the dioxin/furan emission limits for ceramic tile 

manufacturing and sanitaryware manufacturing in concentration 

format only. Two commenters stated that the final dioxin/furan 

standards should provide the option to comply with a limitation 

expressed in units of ng/Mg of tile produced, in addition to or 

in lieu of the proposed standard stated in ng/dscm. A mass-based 

production-related standard effectively removed the issues 

around oxygen correction created by use of a standard based only 

on concentration. Further, the commenters asserted that it is a 

more universally appropriate adjustment for comparison of 

emissions from large kilns having high air flow rates to 

emissions from small kilns with low air volumes. The third 

commenter agreed and noted that the proposed limits for PM and 
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Hg are expressed as lb/ton fired product. The commenter asked 

EPA to explain how the concentration format for the emission 

limit is more appropriate for dioxins/furans than a mass 

throughput limit. If it is not, the commenter suggested using a 

mass throughput format for the dioxin/furan emission limit. 

Response: The dioxin/furan limits provided in the final 

rule for clay ceramics are in units of ng TEQ/kg of throughput 

fired or processed. The EPA agrees that this change in format 

eliminates the questions surrounding the oxygen correction for 

concentration values and is more consistent with the other units 

of measure provided in the Clay Ceramics Manufacturing NESHAP. 

To demonstrate compliance with the limits, the owner or operator 

will determine the mass TEQ for each test run (using the TEFs in 

Table 5 to subpart KKKKK), divide the mass TEQ by the production 

rate during the test run, and average the test runs. 

The production-based dioxin/furan limits are provided in 

lieu of the proposed concentration limits. The compliance 

flexibility provided to the BSCP Manufacturing source category 

(including alternative compliance options for PM and Hg) was 

solely related to concerns under the Small Business Regulatory 

Enforcement Fairness Act (SBREFA), specifically reducing the 

regulatory burden of the numerous small entities in the BSCP 

category. There are no small businesses expected to be subject 
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to the Clay Ceramics Manufacturing NESHAP, so the EPA determined 

that no additional compliance flexibility was necessary or 

warranted for the clay ceramics source category. 

3. Startup and Shutdown 

Comment: One commenter challenged the proposed startup and 

shutdown regulations for ceramic tile manufacturing. The 

commenter asserted that these standards are based conceptually 

on the desire to minimize the time during which ceramic tile 

manufacturing process units operate in a temperature range that 

is “conducive” to the formation of new dioxins/furans (i.e., 

200-450 °C). The commenter stated that this concern is moot 

because there are no new dioxins/furans formed in the ceramic 

tile industry sector, based on the emissions data the EPA 

proposed to use to set MACT floors for ceramic tile sources and 

on the fact that ceramic tile dioxin/furan congener profiles are 

different from the profile of the dioxins/furans created as a 

product of combustion. 

The commenter also challenged the EPA’s startup and 

shutdown proposal for spray dryers relative to dioxins/furans. 

The input to the spray dryer experiences no more than 212 °F 

because the operational purpose of the spray dryer is to cause 

the excess moisture suspended or attached to the ball clay 

matrix to evaporate. If any spray dryer operating temperature is 
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relevant to the EPA’s concern about temperatures in a spray 

dryer conducive to dioxin/furan formation, this is the correct 

focus. 

For ceramic tile floor tile and wall tile roller kilns, the 

commenter stated that the proposed temperature requirements for 

startup and shutdown reflect good kiln production practices; 

therefore, the proposed startup and shutdown standards are 

unnecessary. 

The commenter noted that the standards are based only on 

data from the BSCP subcategory, and the proposed temperatures 

are not appropriate for all sources. For example, ceramic tile 

dryers uniformly operate below 400 °F, so product could never be 

introduced to a tile dryer. The commenter also noted that the 

startup provisions require startup of APCD at 400 °F. However, 

ceramic tile dryers do not have APCD because they burn only 

natural gas, their normal operating temperature is less than 400 

°F, and their resulting emissions are minimal. For these 

reasons, the proposal effectively constitutes a ban on the 

operation of tile dryers. If tile dryers are not an available 

manufacturing process, ceramic tile manufacturing as it is 

currently conducted in the United States would effectively cease 

at major sources. The commenter stated that the EPA lacks the 

legal authority to implement a de facto shut down of major 
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sources, or to bar the possibility of the proposal of a major 

source, in this industry. 

For all the above reasons, the commenter asserted that the 

EPA must withdraw the startup and shutdown proposal from any 

final NESHAP for this subcategory. The commenter contended that, 

as proposed, these standards are arbitrary and capricious. 

Response: The CAA requires that NESHAP emissions 

limitations under section 112 must apply continuously, including 

during periods of startup and shutdown. As noted in the preamble 

to the proposed rule, we recognize that it is not feasible to 

conduct emission testing during periods of startup and shutdown; 

therefore, owners and operators would be unable to demonstrate 

compliance with the final numeric MACT standards during those 

periods. Therefore, the EPA is finalizing work practice 

standards for periods of startup or shutdown to ensure that the 

Clay Ceramics Manufacturing NESHAP includes continuous section 

112-compliant standards. 

The commenter is correct that the specific startup and 

shutdown work practice standards proposed were based on 

information from the BSCP industry. In absence of any data on 

specific startup and shutdown procedures from the clay ceramics 

section 114 survey, the EPA used the only data available for a 

similar industry. The EPA has not received any additional 
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information from clay ceramics manufacturers on specific 

procedures, and in light of that lack of data, the EPA maintains 

that the less prescriptive startup and shutdown work practices 

being finalized for the BSCP industry are appropriate for the 

clay ceramics industry. First, one of the commenter’s main 

points is that the specific temperatures that were proposed are 

not appropriate for all the types of units to which the 

standards were proposed to apply, which is consistent with 

comments received on the BSCP proposal. Second, the commenter 

did note that the proposed standards reflect good kiln 

production practices for one type of process unit for which the 

specific temperature was appropriate. Therefore, the EPA is 

finalizing work practice standards that are based on best 

practices but are less prescriptive than the proposed standards. 

As a final note, the EPA is clarifying in this response 

that the startup and shutdown standards are not intended to 

minimize only emissions of dioxins/furans. Instead, the 

standards are intended to minimize emissions of all pollutants 

by limiting the amount of throughput being processed before the 

unit reaches full production and limiting the amount of time the 

exhaust is not being routed to the APCD, if applicable. In 

addition, the proposed startup and shutdown work practice 

requirements did not require the use of an APCD, nor do the 
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final standards. The standards only specify the requirements for 

routing exhaust to an APCD if one is present. The EPA has 

reviewed the language in the final rule to ensure the standards 

are clear.

VI. Summary of the Cost, Environmental, Energy and Economic 

Impacts 

A. What are the cost and emissions reduction impacts? 

Table 7 of this preamble illustrates the costs and 

emissions reductions for existing sources under the final BSCP 

Manufacturing NESHAP and final Clay Ceramics Manufacturing 

NESHAP. The costs include the costs of installing APCD as well 

as the costs for the testing and monitoring needed to 

demonstrate compliance. 

TABLE 7. SUMMARY OF COSTS AND EMISSIONS REDUCTIONS FOR BSCP AND CLAY CERAMICS 

EXISTING SOURCESA (2011 DOLLARS) 

 Cost (million) Emissions reductions (tpy) 

Industry Capital Annual HF HCl Cl2

Non-Hg 

HAP 

metalsb Hg PM PM2.5c SO2

BSCP $64.6 $24.6 344 22.1 2.04 7.08 0.0733 643 309 205 

Clay 

Ceramics 

$0.267 $0.0924 0 0 0 0 0 0 0 0 

a Includes costs for APCD, testing and monitoring.

b Includes antimony, arsenic, beryllium, cadmium, chromium, cobalt, lead, 

manganese, nickel and selenium. 

c PM2.5 = particulate matter with particles less than 2.5 micrometers in 

diameter. 

The nationwide capital and annual costs of the APCD, 

testing, and monitoring needed to comply with the final BSCP 

Manufacturing NESHAP are expected to total $64.6 million and 
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$24.6 million, respectively (2011 dollars). The nationwide HAP 

emissions reductions achieved under the final BSCP Manufacturing 

NESHAP are expected to total 375 tpy. The methodology used to 

estimate the nationwide costs and emissions reductions of the 

final BSCP Manufacturing NESHAP is presented in the technical 

memoranda titled “Development of Cost and Emission Reduction 

Impacts for the Final BSCP Manufacturing NESHAP” and “Monitoring 

and Testing Requirements and Costs for the Final BSCP 

Manufacturing NESHAP” in Docket ID No. EPA-HQ-OAR-2013-0291. 

It is anticipated that all sanitaryware emission points 

will meet the MACT floor emission limits in the final Clay 

Ceramics Manufacturing NESHAP, so no emission control costs or 

emissions reductions are expected for these sources. However, 

these facilities are expected to incur $92,400 annually in 

monitoring and testing costs to demonstrate compliance with the 

final Clay Ceramics Manufacturing NESHAP. These costs are 

documented in the technical memorandum titled “Monitoring and 

Testing Requirements and Costs for the Final Clay Ceramics 

Manufacturing NESHAP” in Docket ID No. EPA-HQ-OAR-2013-0290. 

There are no major sources producing ceramic floor tile or 

ceramic wall tile. The five facilities that were major sources 

at the time of the 2008 and 2010 EPA surveys have already taken 

the necessary steps to become synthetic area sources. 
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Consequently, none of the known tile facilities will be subject 

to the provisions of the Clay Ceramics Manufacturing NESHAP, 

which means that no costs or emissions reductions are expected 

for tile affected sources under the final Clay Ceramics 

Manufacturing NESHAP. 

B. What are the secondary impacts? 

Table 8 of this preamble illustrates the secondary impacts 

for existing sources under the BSCP Manufacturing NESHAP and 

Clay Ceramics Manufacturing NESHAP. 

TABLE 8. SUMMARY OF SECONDARY IMPACTS FOR BSCP AND CLAY CERAMICS EXISTING 

SOURCESa

Industry 

Secondary air emissions (tpy) Energy 

impacts 

(MMBtu/yr) 

Solid waste 

impacts 

PM PM2.5 CO NOX SO2 CO2 (tpy) 

BSCP 3.40 1.14 5.74 45.6 133 27,900 461,000 5,210 

Clay Ceramics 0 0 0 0 0 0 0 0 

a CO = carbon monoxide; CO2 = carbon dioxide; MMBtu/yr = million British 

thermal units per year. 

The relevant secondary impacts that were evaluated for the 

BSCP Manufacturing NESHAP and Clay Ceramics Manufacturing NESHAP 

include secondary air emissions, energy impacts and solid waste 

impacts. Indirect or secondary air emissions are impacts that 

result from the increased electricity usage associated with the 

operation of APCD to meet the promulgated limits (i.e., 

increased secondary emissions of criteria pollutants from power 

plants). Energy impacts consist of the electricity needed to 
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operate the APCD, and solid waste impacts consist of the 

particulate captured by the APCD that is disposed of as waste 

(not reused or recycled). 

Under the final BSCP Manufacturing NESHAP, the nationwide 

secondary emissions of the criteria pollutants PM, CO, NOX and 

SO2 are expected to total 188 tpy, and secondary emissions of the 

greenhouse gas pollutant CO2 are expected to total 27,900 tpy, 

with energy impacts of 461,000 MMBtu/yr and solid waste impacts 

of 5,210 tpy. The methodology used to estimate the nationwide 

secondary impacts of the final BSCP Manufacturing NESHAP is 

presented in the technical memorandum “Development of Cost and 

Emission Reduction Impacts for the Final BSCP Manufacturing 

NESHAP” in Docket ID No. EPA-HQ-OAR-2013-0291. 

As noted in the previous section, it is anticipated that 

all sanitaryware emission points will meet the MACT floor 

emission limits in the Clay Ceramics final rule, so there are no 

secondary impacts expected for these sources. There are no major 

sources producing ceramic floor tile or ceramic wall tile. The 

five facilities that were major sources at the time of the 2008 

and 2010 EPA surveys have already taken the necessary steps to 

become synthetic area sources. Consequently, none of the known 

ceramic tile facilities are expected to be subject to the 

provisions of the Clay Ceramics Manufacturing NESHAP, which 
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means that no secondary impacts are expected for ceramic tile 

affected sources under the final Clay Ceramics Manufacturing 

NESHAP. 

C. What are the economic impacts? 

For the BSCP Manufacturing source category, the average 

national brick price under the promulgated standards increases 

by 1.8 percent or $4.37 per 1,000 Standard Brick Equivalent 

(SBE) (2011 dollars), while overall domestic production falls by 

1.5 percent or 52 million bricks per year. Under the promulgated 

standards, the EPA estimated that two to four BSCP manufacturing 

facilities are at significant risk of closure. 

Based on the results of the small entity screening analysis 

for BSCP Manufacturing, the EPA concluded that it is not able to 

certify that the BSCP Manufacturing NESHAP will not have a 

significant impact on a substantial number of small entities. As 

a result, the EPA initiated a Small Business Advocacy Review 

(SBAR) Panel and undertook an Initial Regulatory Flexibility 

Analysis (IRFA). 

For Clay Ceramics Manufacturing, one sanitaryware company 

owns major sources and will incur costs (for testing, 

monitoring, recordkeeping and reporting). That affected company 

is not a small business. The compliance costs are less than 

0.002 percent of sales for the affected company. Hence, the 
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economic impact for compliance is minimal. As noted above, there 

are no major sources producing ceramic floor tile or ceramic 

wall tile. Because no small firms face significant control 

costs, there is no significant impact on small entities. Thus, 

the Clay Ceramics regulation is not expected to have significant 

impact on a substantial number of small entities. 

For more information on the benefits analysis and market 

analyses, please refer to the Regulatory Impact Analysis (RIA) 

for the BSCP Manufacturing NESHAP, “Regulatory Impact Analysis: 

Final Brick and Structural Clay Products NESHAP,” which is 

available in Docket ID No. EPA-HQ-OAR-2013-0291. 

D. What are the benefits? 

Emission controls installed to meet the requirements of 

this rule will generate benefits by reducing emissions of HAP as 

well as criteria pollutants and their precursors, NOX and SO2. 

Sulfur dioxide and NOX are precursors to PM2.5 and ozone. The 

criteria pollutant benefits are considered co-benefits for this 

rule. For this rule, we were only able to quantify the health 

co-benefits associated with reduced exposure to PM2.5 from 

changes in emissions directly emitted PM2.5, SO2, and NOX. We 

estimate the monetized co-benefits of the BSCP Manufacturing 

NESHAP in 2018 to be $83 million to $190 million (2011 dollars) 

at a 3-percent discount rate and $75 million to $170 million 
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(2011 dollars) at a 7-percent discount rate, not including 

consideration of energy disbenefits. Using alternate 

relationships between PM2.5 and premature mortality supplied by 

experts, higher and lower co-benefits estimates are plausible, 

but most of the expert-based estimates fall between these two 

estimates.106 A summary of the emission reduction and monetized 

co-benefits estimates for this BSCP Manufacturing NESHAP at 

discount rates of 3 percent and 7 percent is in Table 9 of this 

preamble. 

TABLE 9. SUMMARY OF THE MONETIZED PM2.5 CO-BENEFITS FOR THE BSCP MANUFACTURING 

NESHAP IN 2018 (MILLIONS OF 2011 DOLLARS)a,b

Pollutant 

Emission 

reductions 

(tpy) 

Total monetized cobenefits 

(3 percent 

Discount) 

Total monetized cobenefits 

(7 percent 

Discount) 

Directly 

emitted PM2.5

308 $83 to $190 $75 to $170 

PM2.5 precursors 

SO2 72 $2.9 to $6.6 $2.6 to $6.0 

NOX

c -46 -$0.29 to -$0.66 -$0.26 to -$0.59 

Total monetized benefits $84 to $190 $76 to $170 

a All estimates are for the analysis year and are rounded to two significant 

figures so numbers may not sum across rows. The total monetized co-benefits 

reflect the human health benefits associated with reducing exposure to PM2.5

through reductions of PM2.5 precursors, such as SO2 and directly emitted PM2.5. 

It is important to note that the monetized co-benefits do not include reduced 

health effects from exposure to HAP, direct exposure to nitrogen dioxide 

(NO2), exposure to ozone, ecosystem effects or visibility impairment. b PM co-benefits are shown as a range from Krewski, et al. (2009) to Lepeule, 

et al. (2012). These models assume that all fine particles, regardless of 

their chemical composition, are equally potent in causing premature mortality 

because the scientific evidence is not yet sufficient to allow 

differentiation of effects estimates by particle type. 

c These emission reductions are the net emission reductions from the rule 

 

106 Roman, et al., 2008. “Expert Judgment Assessment of the Mortality Impact of 

Changes in Ambient Fine Particulate Matter in the U.S.,” Environ. Sci. 

Technol., 42, 7, 2268 – 2274. 
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after subtracting out secondary emission increases due additional energy 

requirements to run the control equipment. These estimates do not include 

monetized CO2 disbenefits, which range from $0.3 to $3 million depending on 

the discount rate. See the RIA for more information about how the EPA 

monetized these disbenefits. 

These co-benefits estimates represent the total monetized 

human health benefits for populations exposed to less PM2.5 from 

controls installed to reduce air pollutants in order to meet 

this rule. Due to analytical limitations, it was not possible to 

conduct air quality modeling for this rule. Instead, we used a 

“benefit-per-ton” approach to estimate the benefits of this 

rulemaking. To create the benefit-per-ton estimates, this 

approach uses a model to convert emissions of PM2.5 precursors 

into changes in ambient PM2.5 levels and another model to 

estimate the changes in human health associated with that change 

in air quality, which are then divided by the emissions in 

specific sectors. These benefit-per-ton estimates were derived 

using the approach published in Fann et al. (2012),107 but they 

have since been updated to reflect the studies and population 

data in the 2012 PM National Ambient Air Quality Standards 

(NAAQS) RIA.108 Specifically, we multiplied the benefit-per-ton 

 

107 Fann, N., K.R. Bakerand C.M. Fulcher. 2012. “Characterizing the PM2.5-

related health benefits of emission reductions for 17 industrial, area and 

mobile emission sectors across the U.S.” Environment International 49 41–151. 

108 U.S. Environmental Protection Agency (U.S. EPA). 2012. Regulatory Impact 

Analysis for the Final Revisions to the National Ambient Air Quality 

Standards for Particulate Matter. EPA-452/R-12-003. Office of Air Quality 
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estimates from the “Non-EGU Point other” category by the 

corresponding emission reductions.109 All national-average 

benefit-per-ton estimates reflect the geographic distribution of 

the modeled emissions, which may not exactly match the emission 

reductions in this rulemaking and thus, they may not reflect the 

local variability in population density, meteorology, exposure, 

baseline health incidence rates or other local factors for any 

specific location. More information regarding the derivation of 

the benefit-per-ton estimates for this category is available in 

the technical support document, which is available as Docket 

Item No. EPA-HQ-OAR-2013-0291-0089. 

These models assume that all fine particles, regardless of 

their chemical composition, are equally potent in causing 

premature mortality because the scientific evidence is not yet 

sufficient to allow differentiation of effects estimates by 

particle type. Even though we assume that all fine particles 

have equivalent health effects, the benefit-per-ton estimates 

vary between precursors depending on the location and magnitude 

of their impact on PM2.5 levels, which drive population exposure. 

 

Planning and Standards, Health and Environmental Impacts Division. December. 

Available at http://www.epa.gov/pm/2012/finalria.pdf. 

109 U.S. Environmental Protection Agency. 2013. Technical support document: 

Estimating the benefit per ton of reducing PM2.5 precursors from 17 sectors.

Research Triangle Park, NC. January. 
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It is important to note that the magnitude of the PM2.5 cobenefits is largely driven by the concentration response 

function for premature mortality. We cite two key empirical 

studies, one based on the American Cancer Society cohort study110

and the extended Six Cities cohort study.111 In the RIA for the 

final rule, which is available in Docket ID No. EPA-HQ-OAR-2013-

0291, we also include benefits estimates derived from expert 

judgments (Roman et al., 2008) as a characterization of 

uncertainty regarding the PM2.5-mortality relationship. 

Considering a substantial body of published scientific 

literature, reflecting thousands of epidemiology, toxicology and 

clinical studies, the EPA’s Integrated Science Assessment for 

Particulate Matter112 documents the association between elevated 

PM2.5 concentrations and adverse health effects, including 

increased premature mortality. This assessment, which was twice 

reviewed by the EPA’s independent SAB, concluded that the 

scientific literature consistently finds that a no-threshold 

model most adequately portrays the PM-mortality concentration-

 

110 Krewski, C.A., III, R.T. Burnett, M.J. Thun, E.E. Calle, D. Krewski, K. 

Itoand G.D. Thurston. 2002. “Lung Cancer, Cardiopulmonary Mortalityand Longterm Exposure to Fine Particulate Air Pollution.” Journal of the American 

Medical Association 287:1132-1141. 111 Lepeule J, Laden F, Dockery D, Schwartz J 2012. “Chronic Exposure to Fine 

Particles and Mortality: An Extended Follow-Up of the Harvard Six Cities 

Study from 1974 to 2009.” Environ Health Perspect. July; 120(7):965-70. 112 U.S. Environmental Protection Agency (U.S. EPA). 2009. Integrated Science 

Assessment for Particulate Matter (Final Report). EPA-600-R-08-139F. National 

Center for Environmental Assessment – RTP Division. December. Available on 

the Internet at http://cfpub.epa.gov/ncea/cfm/recordisplay.cfm?deid=216546. 
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response relationship. Therefore, in this analysis, the EPA 

assumes that the health impact function for fine particles is 

without a threshold. 

In general, we are more confident in the magnitude of the 

risks we estimate from simulated PM2.5 concentrations that 

coincide with the bulk of the observed PM concentrations in the 

epidemiological studies that are used to estimate the benefits. 

Likewise, we are less confident in the risk we estimate from 

simulated PM2.5 concentrations that fall below the bulk of the 

observed data in these studies. Concentration benchmark analyses 

(e.g., lowest measured level (LML) or one standard deviation 

below the mean of the air quality data in the study) allow 

readers to determine the portion of population exposed to annual 

mean PM2.5 levels at or above different concentrations, which 

provides some insight into the level of uncertainty in the 

estimated PM2.5 mortality benefits. There are uncertainties 

inherent in identifying any particular point at which our 

confidence in reported associations becomes appreciably less and 

the scientific evidence provides no clear dividing line. 

However, the EPA does not view these concentration benchmarks as 

a concentration threshold below which we would not quantify 

health benefits of air quality improvements. 
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For this analysis, policy-specific air quality data are not 

available due to time or resource limitations and thus, we are 

unable to estimate the percentage of premature mortality 

associated with this specific rule’s emission reductions at each 

PM2.5 level. As a surrogate measure of mortality impacts, we 

provide the percentage of the population exposed at each PM2.5

level using the source apportionment modeling used to calculate 

the benefit-per-ton estimates for this sector. Using the 

Krewski, et al. (2009) study, 93 percent of the population is 

exposed to annual mean PM2.5 levels at or above the LML of 5.8 

μg/m3. Using the Lepeule, et al. (2012) study, 67 percent of the 

population is exposed above the LML of 8 μg/m3. It is important 

to note that baseline exposure is only one parameter in the 

health impact function, along with baseline incidence rates 

population and change in air quality. Therefore, caution is 

warranted when interpreting the LML assessment for this rule 

because these results are not consistent with results from rules 

that had air quality modeling. 

Every benefit analysis examining the potential effects of a 

change in environmental protection requirements is limited, to 

some extent, by data gaps, model capabilities (such as 

geographic coverage) and uncertainties in the underlying 

scientific and economic studies used to configure the benefit 
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and cost models. Despite these uncertainties, we believe the 

benefit analysis for this rule provides a reasonable indication 

of the expected health benefits of the rulemaking under a set of 

reasonable assumptions. This analysis does not include the type 

of detailed uncertainty assessment found in the 2012 PM2.5 NAAQS 

RIA113 because we lack the necessary air quality input and 

monitoring data to run the benefits model. In addition, we have 

not conducted air quality modeling for this rule, and using a 

benefit-per-ton approach adds another important source of 

uncertainty to the benefits estimates. The 2012 PM2.5 NAAQS 

benefits analysis provides an indication of the sensitivity of 

our results to various assumptions. 

It should be noted that the monetized co-benefits estimates 

provided above do not include benefits from several important 

benefit categories, including exposure to HAP, NOX and ozone 

exposure, as well as ecosystem effects and visibility 

impairment. Although we do not have sufficient information or 

modeling available to provide monetized estimates for this rule, 

we include a qualitative assessment of these unquantified 

benefits in the RIA for these promulgated standards. 

 

113 U.S. Environmental Protection Agency (U.S. EPA). 2012. Regulatory Impact 

Analysis for the Final Revisions to the National Ambient Air Quality 

Standards for Particulate Matter. EPA-452/R-12-003. Office of Air Quality 

Planning and Standards, Health and Environmental Impacts Division. December. 

Available at http://www.epa.gov/pm/2012/finalria.pdf. 
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The specific control technologies for this rule are 

anticipated to have minor secondary disbenefits, including an 

increase of 41 tons of NOX, about 3 tons of PM, less than 6 tons 

of CO and 121 tons of SO2 each year. Because we do not currently 

have methods to monetize emission changes of CO, only secondary 

effects of PM, SO2, and NOX were included in the monetary 

evaluation of the actual benefits. 

For more information on the benefits analysis, please refer 

to the RIA for this rule, “Regulatory Impact Analysis: Final 

Brick and Structural Clay Products NESHAP,” which is available 

in Docket ID No. EPA-HQ-OAR-2013-0291. 

VII. Statutory and Executive Order Reviews 

Additional information about these statutes and Executive 

Orders can be found at http://www2.epa.gov/lawsregulations/laws-and-executive-orders. 

A. Executive Order 12866: Regulatory Planning and Review and 

Executive Order 13563: Improving Regulation and Regulatory 

Review 

This action is an economically significant regulatory 

action that was submitted to the Office of Management and Budget 

(OMB) for review. Any changes made in response to OMB 

recommendations have been documented in the dockets for this 

action. The EPA prepared an analysis of the potential costs and 
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benefits associated with this action. This analysis is contained 

in “Regulatory Impact Analysis: Final Brick and Structural Clay 

Products NESHAP.” A copy of the analysis is available in the 

docket for the BSCP Manufacturing NESHAP (Docket ID No. EPA-HQOAR-2013-0291) and the analysis is briefly summarized here. 

The EPA’s study estimates that affected BSCP facilities 

will incur total annualized costs of $24.6 million (2011 

dollars) under the BSCP Manufacturing NESHAP, including costs of 

emission controls, testing and monitoring, along with 

recordkeeping and reporting costs for facilities that have 

testing and monitoring. The EPA gathered information on firm 

sales and overall industry profitability for firms owning 

affected BSCP facilities. The EPA estimated that two to four 

BSCP manufacturing facilities are at significant risk of closure 

under the final standards. 

The EPA also conducted an assessment of the benefits of the 

final rule, as described in section VI of this preamble. These 

estimates reflect the monetized human health benefits of 

reducing cases of morbidity and premature mortality among 

populations exposed to PM2.5 reduced by this rule. Data, resource 

and methodological limitations prevented the EPA from monetizing 

the benefits from several important benefit categories, 

including benefits from reducing exposure to 375 tons of HAP 
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each year for the promulgated standards, as well as ecosystem 

effects and visibility impairment. In addition to reducing 

emissions of PM precursors such as SO2, this rule will reduce 

several non-Hg HAP metals emissions (i.e., arsenic, cadmium, 

chromium, lead, manganese, nickel, and selenium) each year. The 

EPA estimates the total monetized co-benefits to be $83 million 

to $190 million (2011 dollars) at a 3-percent discount rate and 

$75 million to $170 million (2011 dollars) at a 7-percent 

discount rate on a yearly average in 2018 for the promulgated 

standards. 

Based on the EPA’s examination of costs and benefits of the 

final BSCP Manufacturing NESHAP, the EPA believes that the 

benefits of the BSCP Manufacturing NESHAP will exceed the costs. 

The EPA also examined the costs and economic impacts 

associated with the Clay Ceramics Manufacturing NESHAP. The 

remaining firm with major sources is estimated to incur costs as 

a result of the Clay Ceramics final rule and the firm only 

incurs costs associated with testing, monitoring, recordkeeping 

and reporting. Total annualized costs are only $92,400 (2011 

dollars) and the firm’s estimated costs of complying with the 

Clay Ceramics Manufacturing NESHAP are less than 0.002 percent 

of sales. 
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B. Paperwork Reduction Act (PRA) 

The information collection requirements in the BSCP 

Manufacturing NESHAP and Clay Ceramics Manufacturing NESHAP have 

been submitted for approval to OMB under the PRA, 44 U.S.C. 3501 

et seq. The Information Collection Request (ICR) document that 

the EPA prepared for the BSCP Manufacturing NESHAP has been 

assigned EPA ICR number 2509.01. The ICR document that the EPA 

prepared for the Clay Ceramics Manufacturing NESHAP has been 

assigned EPA ICR number 2510.01. You can find copies of the ICRs 

in the dockets for the BSCP Manufacturing NESHAP and Clay 

Ceramics Manufacturing NESHAP, and they are briefly summarized 

here. The information collection requirements are not 

enforceable until OMB approves them. 

The information collected from respondents will be used by 

EPA enforcement personnel to: (1) identify new, modified, 

reconstructed and existing sources subject to the standards; 

(2) ensure that MACT is being properly applied; and (3) ensure 

that the APCD are being properly operated and maintained on a 

continuous basis. In addition, records and reports are necessary 

to enable the EPA to identify facilities that may not be in 

compliance with the standards. Based on the reported 

information, the EPA can decide which facilities should be 

inspected and what records or processes should be inspected at 
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these facilities. The records that facilities maintain will 

indicate to the EPA whether the owners and operators are in 

compliance with the emission limitations (including emission 

limits, operating limits) and work practice standards. Much of 

the information the EPA would need to determine compliance would 

be recorded and retained onsite at the facility. Such 

information would be reviewed by enforcement personnel during an 

inspection and would not need to be routinely reported to the 

EPA. 

All information submitted to the EPA for which a claim of 

confidentiality is made will be safeguarded according to EPA 

policies set forth in title 40, chapter 1, part 2, subpart B - 

Confidentiality of Business Information. (See 40 CFR 2; 41 FR 

36902, September 1, 1976; amended by 43 FR 39999, September 28, 

1978; 43 FR 42251, September 28, 1978; and 44 FR 17674, March 

23, 1979.) 

Potential respondents to the information collection 

requirements in the BSCP Manufacturing NESHAP are owners and 

operators of new and existing sources at BSCP manufacturing 

facilities. A BSCP facility manufactures brick, including face 

brick, structural brick, brick pavers, or other brick and/or 

structural clay products including clay pipe; roof tile; 

extruded floor and wall tile; or other extruded, dimensional 
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clay products. The BSCP facilities typically form, dry and fire 

bricks and shapes that are composed primarily of clay and shale. 

Kilns are used to fire BSCP. The rule applies to all new and 

existing tunnel and periodic kilns at BSCP facilities. 

Potential respondents to the information collection 

requirements in the Clay Ceramics Manufacturing NESHAP are 

owners and operators of new and existing sources at clay 

ceramics manufacturing facilities. A clay ceramics facility 

manufactures pressed floor tile, pressed wall tile, or 

sanitaryware (e.g., sinks and toilets). Clay ceramics facilities 

typically form, dry and fire tile or sanitaryware products that 

are composed of clay, shale and various additives. Spray dryers 

are used during the forming process at tile facilities to 

process the ceramic mix into a powder to allow tile pressing. 

Dryers are used to reduce the moisture content of the ceramic 

products prior to firing. Glazes are applied to some tile and 

sanitaryware products, with glaze spraying accounting for all 

glazing emissions. Kilns are used to fire the ceramic products 

and include ceramic tile roller kilns and sanitaryware tunnel 

and shuttle kilns. The rule applies to all existing, new and 

reconstructed affected sources, which include the kilns, glaze 

spray operations, ceramic tile spray dryers and floor tile press 
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dryers. (Wall tile press dryers and sanitaryware ware dryers, 

with no measurable emissions, are not covered.) 

The information requirements are based on notification, 

recordkeeping and reporting requirements in the NESHAP General 

Provisions (40 CFR part 63, subpart A), which are mandatory for 

all operators subject to national emissions standards. These 

recordkeeping and reporting requirements are specifically 

authorized by CAA section 114 (42 U.S.C. 7414). All information 

submitted to the EPA pursuant to the recordkeeping and reporting 

requirements for which a claim of confidentiality is made is 

safeguarded according to the EPA policies set forth in 40 CFR 

part 2, subpart B. 

In addition to the notification, recordkeeping and 

reporting requirements in the NESHAP General Provisions, the 

final rule includes paperwork requirements associated with 

initial and 5-year repeat testing for selected process 

equipment, electronic reporting of performance test results, 

parameter monitoring, preparation of an OM&M plan, maintenance 

and inspection of process and control equipment, compliance with 

work practice standards and periods of malfunction. 

Collection of data will begin after the effective date of 

the final BSCP Manufacturing NESHAP and Clay Ceramics 

Manufacturing NESHAP. The compliance date for existing sources 
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is 3 years after the effective date. The compliance date for new 

or reconstructed sources is the effective date if the source 

startup date is before the effective date, or upon startup if 

the startup date is on or after the effective date. The schedule 

for notifications and reports required by the rule is summarized 

below. 

For BSCP and clay ceramics facilities with existing 

affected sources, the initial notification stating that the 

facility is subject to the rule must be submitted no later than 

120 calendar days after the effective date of the rule. 

Facilities with new or reconstructed affected sources for which 

startup occurs on or after the effective date must submit the 

initial notification no later than 120 calendar days after the 

source becomes subject to the rule (although we are projecting 

no new affected sources in the short term). Facilities may 

choose to submit a request for a routine control device 

maintenance exemption 30 calendar days prior to the compliance 

date. Facilities required to conduct a performance test must 

submit a notification of intent to conduct a performance test at 

least 60 calendar days before the performance test is scheduled 

to begin. For each initial compliance demonstration that 

includes a performance test, facilities must submit an initial 

notification of compliance status no later than 60 calendar days 
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following the completion of the performance test. For each 

initial compliance demonstration that does not involve a 

performance test, facilities must submit an initial notification 

within 30 calendar days of completing the initial compliance 

demonstration. Records necessary to determine compliance with 

the emission limitations and work practice standards must be 

compiled on a daily basis, and compliance reports must be 

submitted to the Administrator on a semiannual basis. Repeat 

performance tests are to be conducted every 5 years to ensure 

ongoing compliance. 

There are 91 BSCP facilities that are currently major 

sources of HAP, 85 of which have at least one tunnel kiln. An 

estimated 22 of these facilities are projected to become 

synthetic area sources by promulgation rather than comply with 

the BSCP standards. The remaining 69 facilities (63 of which 

have a tunnel kiln) are expected to be subject to the BSCP 

Manufacturing NESHAP. For these 69 facilities, the annual 

recordkeeping and reporting burden associated with the BSCP 

standards (averaged over the first 3 years after the effective 

date of the standards) is estimated to be 20,963 labor hours per 

year, at a cost of $1,113,105 per year (yr). Burden is defined 

at 5 CFR 1320.3(b). 
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No capital costs associated with monitoring, testing, 

recordkeeping or reporting are expected to be incurred during 

this period. The annual operation and maintenance costs are 

estimated to be $682/yr. 

The total burden for the federal government (averaged over 

the first 3 years after the effective date of the standards) is 

estimated to be 71 labor hours per year, at a total labor cost 

of $3,698/yr. (All costs are in 2011 dollars.) 

There are three clay ceramics facilities that are currently 

major sources of HAP and are expected to be subject to the Clay 

Ceramics Manufacturing NESHAP. For these three facilities, the 

annual recordkeeping and reporting burden associated with the 

Clay Ceramics standards (averaged over the first 3 years after 

the effective date of the standards) is estimated to total 996 

labor hours per year at a cost of $52,674/yr. 

As with the BSCP standards, no capital costs associated 

with monitoring, testing, recordkeeping or reporting are 

expected to be incurred during this period. The annual operation 

and maintenance costs are estimated to be $44/yr. 

The total burden for the federal government (averaged over 

the first 3 years after the effective date of the standards) is 

estimated to be 4.6 labor hours per year, at a total labor cost 

of $239/yr. (All costs are in 2011 dollars.) 
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Because BSCP and clay ceramics facilities are not required 

to come into full compliance with the standards until 3 years 

after promulgation, much of the respondent burden (e.g., 

performance tests, inspections, notification of compliance 

status, compliance report, records of compliance data and 

malfunctions) does not occur until the fourth year following 

promulgation. 

For the BSCP Manufacturing NESHAP, we estimate an average 

annual recordkeeping and reporting burden of 48,674 labor hours 

per year, at a cost of $2,702,447/yr, for years 4 through 6. We 

also estimate annualized capital costs of $606,760/yr and annual 

operating and maintenance costs of $206,872/yr over this period, 

for a total annualized cost of $813,632/yr. The average annual 

burden for the federal government for years 4 through 6 is 

estimated to be 3,891 labor hours per year, at a total labor 

cost of $204,550/yr. (All costs are in 2011 dollars.) 

For the Clay Ceramics Manufacturing NESHAP, we estimate an 

average annual recordkeeping and reporting burden of 2,323 labor 

hours per year, at a cost of $122,786/yr, for years 4 through 6. 

We also estimate annualized capital costs of $72,050/yr and 

annual operating and maintenance costs of $27,069/yr over this 

period, for a total annualized cost of $99,119/yr. The average 

annual burden for the federal government for years 4 through 6 
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is estimated to be 180 labor hours per year, at a total labor 

cost of $9,448 per year. (All costs are in 2011 dollars.) 

An agency may not conduct or sponsor, and a person is not 

required to respond to, a collection of information unless it 

displays a currently valid OMB control number. The OMB control 

numbers for the EPA’s regulations in 40 CFR are listed in 40 CFR 

part 9. When OMB approves this ICR, the agency will announce 

that approval in the Federal Register and publish a technical 

amendment to 40 CFR part 9 to display the OMB control number for 

the approved information collection activities contained in this 

final rule. 

C. Regulatory Flexibility Act (RFA) 

Pursuant to sections 603 and 609(b) of the RFA, the EPA 

prepared an IRFA for the proposed rule and convened a SBAR Panel 

to obtain advice and recommendations from small entity 

representatives that potentially would be subject to the rule’s 

requirements. Summaries of the IRFA and Panel recommendations 

are included at 79 FR 75669-75671. 

As required by section 604 of the RFA, the EPA prepared a 

final regulatory flexibility analysis (FRFA) for this action. 

The FRFA addresses the issues raised by public comments on the 

IRFA for the proposed rule. The complete FRFA is included in 

Section 5 of “Regulatory Impact Analysis: Final Brick and 
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Structural Clay Products NESHAP,” available for review in the 

docket (Docket ID No. EPA-HQ-OAR-2013-0291), and is summarized 

here. 

1. Need for the Rule 

The EPA is required under CAA section 112(d) to establish 

emission standards for each category or subcategory of major and 

area sources of HAP listed for regulation in section 112(b). 

These standards are applicable to new or existing sources of HAP 

and shall require the maximum degree of emission reduction. In 

the Administrator’s judgment, the pollutants emitted from BSCP 

manufacturing facilities cause or contribute significantly to 

air pollution that may reasonably be anticipated to endanger 

public health. Consequently, NESHAP for the BSCP source category 

are being finalized. 

2. Objectives and Legal Basis for the Rule 

Section 112(d) of the CAA requires the EPA to set emissions 

standards for HAP emitted by major stationary sources based on 

the performance of the MACT. The MACT standards for existing 

sources must be at least as stringent as the average emissions 

limitation achieved by the best performing 12 percent of 

existing sources (for which the Administrator has emissions 

information) or the best performing five sources for source 

categories with less than 30 sources (CAA section 112(d)(3)(A) 
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and (B)). For new sources, MACT standards must be at least as 

stringent as the control level achieved in practice by the best 

controlled similar source (CAA section 112(d)(3)). The EPA also 

must consider more stringent “beyond-the-floor” control options. 

When considering beyond-the-floor options, the EPA must consider 

not only the maximum degree of reduction in emissions of HAP, 

but must take into account costs, energy and non-air 

environmental impacts when doing so. This rule is being proposed 

to comply with CAA section 112(d). 

3. Significant Issues Raised 

The EPA received comments on the proposed standards and 

requests for comment that were included based on SBAR Panel 

recommendations. See section V of this preamble and “National 

Emission Standards for Hazardous Air Pollutants for Brick and 

Structural Clay Products Manufacturing: Background Information 

for Final Rule - Summary of Public Comments and Responses” in 

Docket ID No. EPA-HQ-OAR-2013-0291 for more detailed comment 

summaries and responses. 

 Work practices for dioxin/furan: One commenter stated that 

work practices for dioxin/furan emissions from BSCP tunnel 

kilns are not lawful under the CAA, and even if they were, 

the work practices proposed are not sufficient to minimize 
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dioxin/furan emissions. Other commenters supported the 

proposed work practices for dioxin/furan. 

Response: The EPA is finalizing work practices for 

dioxin/furan as proposed. The EPA’s response to the legal 

arguments made against work practice standards is presented 

in “National Emission Standards for Hazardous Air 

Pollutants for Brick and Structural Clay Products 

Manufacturing: Background Information for Final Rule - 

Summary of Public Comments and Responses” found in the 

docket (Docket ID No. EPA-HQ-OAR-2013-0291). 

 Work practices for Hg and other metals: Several commenters 

responded to the EPA’s request for comment on work 

practices for Hg and non-Hg HAP metals. Numerous commenters 

stated that the EPA should finalize work practices instead 

of numeric limits and provided support for their assertion 

that the numeric limits are technically and economically 

impracticable to enforce. Commenters also noted that the 

emissions reduced by these numeric standards are not 

justified by the high cost that would be incurred to meet 

the standards. 

Response: Emissions of Hg and non-Hg HAP metals were 

detected using standard EPA test methods; therefore, the Hg 

and non-Hg HAP metals data sets do not meet the criteria 
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for setting work practice standards under CAA section 

112(h). The EPA is finalizing numeric standards for Hg and 

non-Hg HAP metals under CAA section rather than work 

practices. The final numeric standards are revised from 

proposal to account for new data from the industry 

(including data on the Hg content of raw materials), 

removal of test data found not to meet the requirements of 

the applicable data, and changes in the EPA’s approach to 

selecting the MACT floor pools (see section V.B.1 of this 

preamble for additional details). 

 Health-based standard for acid gases: Several commenters 

asserted that the EPA may not legally set CAA section 

112(d)(4) health-based standards for acid gases for BSCP 

facilities. Other commenters supported the EPA’s decision 

to propose health-based standards for acid gases but noted 

that the EPA’s approach was overly conservative and 

requested that the EPA consider setting multiple limits 

based on site characteristics. 

Response: The EPA is finalizing the health-based standards 

for acid gases as proposed. The EPA’s response to the legal 

arguments made against health-based standards is presented 

in section V.A of this preamble. The EPA is not changing 
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the HBEL from proposal, as the proposed HBEL provides low 

potential for both chronic and acute health effects. 

 Size subcategories for MACT floors: Several commenters 

requested that the EPA subcategorize by size for the non-Hg 

HAP metal/PM MACT floor limits, as was proposed for Hg. 

Response: As part of recalculating the MACT floor limits 

based on the final data set, the EPA is finalizing separate 

limits for small and large kilns for non-Hg HAP metals/PM 

as well as Hg. The EPA is also finalizing limits in three 

different formats for both pollutants to provide additional 

flexibility for small tunnel kilns and tunnel kilns with a 

low metals content in the PM emissions. 

 Sawdust dryers: Several commenters requested that the EPA 

finalize a subcategory of sawdust-fired kilns venting to 

sawdust dryers. Commenters provided general descriptions of 

how the operation of these kilns is different than tunnel 

kilns and stated that there are only two operating that 

would be subject to the BSCP Manufacturing NESHAP. 

Response: Although one commenter noted that stack testing 

of a sawdust dryer is being considered, commenters did not 

provide test data to demonstrate that emissions from 

sawdust dryers are different than other tunnel kilns. 
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Therefore, the EPA is not finalizing a subcategory of 

sawdust-fired kilns venting to sawdust dryers. 

 Periods of startup and shutdown: One commenter stated that 

work practices for periods of startup and shutdown of BSCP 

tunnel kilns are not lawful under the CAA. Other commenters 

supported the proposal to provide work practices for 

periods of startup and shutdown but suggested improvements 

to the standards to make them feasible for all tunnel 

kilns. 

Response: The EPA evaluated the comments and is finalizing 

work practice standards for periods of startup and shutdown 

that reflect best practices for minimizing emissions during 

these periods (see section V.B.2 of this preamble for 

additional information). 

 MACT floor pool: Several commenters supported the EPA’s 

proposal to calculate MACT floor standards for PM based on 

the top 12 percent of the kilns in the industry (i.e., the 

best-performing sources with a FF-based APCD). One 

commenter asserted that the EPA’s proposal is unlawful and 

the EPA must consider other factors than the APCD type when 

setting MACT standards. 

Response: The EPA reviewed all the data used for the MACT 

floor for PM as a surrogate for non-Hg HAP metals and found 
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that some of the test data did not meet the requirements of 

EPA Method 5. When these data were removed, the EPA could 

no longer confirm that the data available to the agency 

represented all the best-performing sources. Therefore, the 

final PM and non-Hg HAP metals are based on the top 12 

percent of sources for which we had test data, regardless 

of APCD type (see section V.B.1 of this preamble for 

additional details). 

4. Small Business Administration (SBA) Comments 

The SBA’s Office of Advocacy supported the EPA’s proposals 

to set work practice standards and health-based emission 

standards in all instances allowed by statute and suggested 

other areas of improvement. The comments on areas of improvement 

and the EPA’s responses are summarized below: 

 Hg standards: The EPA should pursue subcategorization by 

input (raw material) type and delay promulgation of a Hg 

standard to gather more information if needed. Standards 

may need to be combined with a significantly longer 

averaging time to allow for continuous compliance. 

Response: As an initial point, it is doubtful that the EPA 

had the option of delaying the promulgation of an Hg 

standard. Under CAA section 112(e), the EPA was scheduled 

to complete standards for all source categories by 2000. 
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The EPA’s 2003 BSCP NESHAP was vacated, and that vacatur 

re-created the EPA’s obligation to set standards for the 

BSCP source category. Sierra Club v. EPA, 850 F.Supp.2d 

300, 303-304 (D.D.C. 2012). Under the consent decree in 

that case, as amended in August 2014, the EPA was obligated 

to sign a notice of final rulemaking to set standards for 

the BSCP source category by September 24, 2015. 

 In any event, delay is not warranted. Following 

proposal, the EPA received additional information on the Hg 

content of raw materials from facilities in the BSCP 

industry. This information did not provide the EPA with the 

information needed to establish subcategories based on the 

class or type of raw materials. However, the EPA has 

concluded that it has sufficient information to allow it to 

finalize Hg standards that account for the variability of 

Hg content in raw materials. Thus, the EPA’s conclusion is 

that there is no need to delay promulgation of the Hg 

standards in order to gather more information. 

 Economic analysis: The economic impact of the proposed rule 

on small entities is significantly underestimated. 

Specifically, the EPA should not annualize costs at 7 

percent over 20 years because that does not reflect the 

financing options available to small entities, the EPA 
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underestimated the cost for a facility to become a 

synthetic area source, and the EPA has underestimated the 

cost to comply with the Hg standards given the limited 

information the agency has on the performance of Hg 

controls in this industry. 

Response: The EPA standard engineering cost practice is to 

annualize over the expected life of the control equipment 

at 7 percent. The EPA does not have the data available to 

model the way a firm pays for an APCD because each firm has 

a different set of potential options for financing 

including debt financing, equity financing, and financing 

through retained earnings. The EPA acknowledges that some 

firms may not be able to borrow the money and some may 

close. The EPA’s closure analysis is quite uncertain, but 

we do not have the detailed firm specific information 

necessary to refine the analysis. The EPA agrees that the 

costs to become a synthetic area source at proposal were 

underestimated, and the final rule impacts include testing 

costs for all facilities, as potential synthetic area 

sources would have to demonstrate that their emissions 

qualify them to apply for synthetic area status. Finally, 

the EPA must use the best information available to the 

agency to estimate the impact of the standards on all 
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entities. The final Hg standards incorporate variability in 

the Hg content of raw materials, which is expected to ease 

the burdens on some small entities. 

5. Affected Small Entities 

Of 44 parent companies owning BSCP facilities, 36 parent 

companies are small businesses. The EPA computed the ratio of 

estimated compliance costs to company sales (cost-to-sales 

ratio) to measure the magnitude of potential impacts on small 

companies. Under the final standards, the EPA estimated that two 

to three small BSCP manufacturing facilities (two to four BSCP 

manufacturing facilities overall) are at significant risk of 

closure. 

6. Reporting, Recordkeeping, and Other Compliance Requirements 

Respondents would be required to provide one-time and 

periodic notifications, including initial notification, 

notification of performance tests, and notification of 

compliance status. Respondents would also be required to submit 

semiannual reports documenting compliance with the rule and 

detailing any compliance issues, and they would be required to 

submit the results of performance tests to the EPA’s ERT. 

Respondents would be required to keep documentation supporting 

information included in these notifications and reports, as well 
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as records of the operation and maintenance of affected sources 

and APCD at the facility. 

7. Significant Alternatives 

The EPA considered three major options for this final rule; 

see “Regulatory Impact Analysis: Final Brick and Structural Clay 

Products NESHAP,” in Docket ID No. EPA-HQ-OAR-2013-0291), for 

more information about the alternatives. Finalizing the proposed 

changes without revision is expected to have similar cost and 

emission reduction impacts to the standards the EPA is 

finalizing, with a similar number of closures (one to two small 

BSCP manufacturing facilities rather than two to three). 

However, for the various legal and technical reasons outlined in 

this preamble and “National Emission Standards for Hazardous Air 

Pollutants for Brick and Structural Clay Products Manufacturing: 

Background Information for Final Rule - Summary of Public 

Comments and Responses” in Docket ID No. EPA-HQ-OAR-2013-0291, 

the EPA determined that the PM/non-Hg HAP metals and Hg 

standards should not be finalized as proposed. The other 

alternative considered included the same standards for acid 

gases and Hg that are being finalized but only provided one set 

of limits PM/non-Hg HAP metals (i.e., did not provide separate 

sets of limits for small and large tunnel kilns). This 

alternative is expected to have significantly higher cost 
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impacts than the standards the EPA is finalizing, along with a 

significantly higher number of closures (five to 10 small BSCP 

manufacturing facilities rather than two to three small BSCP 

manufacturing facilities). Therefore, the EPA determined that it 

is necessary to exercise its discretion to subcategorize by kiln 

size to minimize the significant economic impact on small 

entities. 

In addition, the EPA is preparing a Small Entity Compliance 

Guide to help small entities comply with this rule. The guide 

will be available on the world wide web approximately 1 year 

after promulgation of the rule, at 

http://www.epa.gov/ttn/atw/brick/brickpg.html. 

D. Unfunded Mandates Reform Act (UMRA) 

This action does not contain an unfunded mandate of $100 

million or more as described in the Unfunded Mandates Reform Act 

(UMRA), 2 U.S.C. 1531-1538, and does not significantly or 

uniquely affect small governments. This action imposes no 

enforceable duty on any state, local, or tribal governments or 

the private sector. 

E. Executive Order 13132: Federalism 

This action does not have federalism implications. It will 

not have substantial direct effects on the states, on the 

relationship between the national government and the states or 
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on the distribution of power and responsibilities among the 

various levels of government. 

F. Executive Order 13175: Consultation and Coordination with 

Indian Tribal Governments 

This action does not have tribal implications, as specified 

in Executive Order 13175. It will not have substantial direct 

effects on tribal governments, on the relationship between the 

federal government and Indian tribes, or on the distribution of 

power and responsibilities between the federal government and 

Indian tribes, as specified in Executive Order 13175. The action 

imposes requirements on owners and operators of BSCP and clay 

ceramics manufacturing facilities and not tribal governments. 

Thus, Executive Order 13175 does not apply to this action. 

G. Executive Order 13045: Protection of Children from 

Environmental Health Risks and Safety Risks 

This action is not subject to Executive Order 13045 because 

the EPA does not believe the environmental health or safety 

risks addressed by this action present a disproportionate risk 

to children. This action’s health and risk assessments are 

contained in the memoranda “Risk Assessment to Determine a 

Health-Based Emission Limitation for Acid Gases for the Brick 

and Structural Clay Products Manufacturing Source Category,” 

Docket Item No. EPA-HQ-OAR-2013-0291-0132 and “Risk Assessment 
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to Determine a Health-Based Emission Limitation for Acid Gases 

for the Clay Ceramics Manufacturing Source Category,” Docket 

Item No. EPA-HQ-OAR-2013-0290-0213. 

H. Executive Order 13211: Actions Concerning Regulations That 

Significantly Affect Energy Supply, Distribution or Use 

This action is not a “significant energy action” because it 

is not likely to have a significant adverse effect on the 

supply, distribution, or use of energy. This action will not 

adversely directly affect productivity, competition, or prices 

in the energy sector. 

I. National Technology Transfer and Advancement Act (NTTAA) 

This action involves technical standards. The EPA has 

decided to use the following four voluntary consensus standards 

as acceptable alternatives to the EPA test methods for the 

purpose of this rule. ANSI/ASME PTC 19-10-1981, Part 10, “Flue 

and Exhaust Gas Analyses,” is acceptable as an alternative to 

Method 3A and 3B for the manual procedures only and not the 

instrumental procedures. ASTM D6735-01 (Reapproved 2009), 

“Standard Test Method for Measurement of Gaseous Chlorides and 

Fluorides from Mineral Calcining Exhaust Sources—Impinger 

Method,” is acceptable as an alternative to Methods 26 and 26A. 

ASTM D6784-02 (Reapproved 2008), “Standard Test Method for 

Elemental, Oxidized, Particle-Bound and Total Mercury Gas 
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Generated from Coal-Fired Stationary Sources (Ontario Hydro 

Method),” is acceptable as an alternative to Method 29 (portion 

for Hg only). 

ASTM D6348-03 (Reapproved 2010), “Standard Test Method for 

Determination of Gaseous Compounds by Extractive Direct 

Interface Fourier Transform Infrared (FTIR) Spectroscopy,” is 

acceptable as an alternative to Method 320 with the following 

conditions: (1) the test plan preparation and implementation in 

the Annexes to ASTM D 6348-03, Sections A1 through A8 are 

mandatory; and (2) in ASTM D6348-03 Annex A5 (Analyte Spiking 

Technique), the percent recovery (%R) must be determined for 

each target analyte (Equation A5.5). In order for the test data 

to be acceptable for a compound, %R must be greater than or 

equal to 70 percent and less than or equal to 130 percent. If 

the %R value does not meet this criterion for a target compound, 

the test data are not acceptable for that compound and the test 

must be repeated for that analyte (i.e., the sampling and/or 

analytical procedure should be adjusted before a retest). The %R 

value for each compound must be reported in the test report and 

all field measurements must be corrected with the calculated %R 

value for that compound by using the following equation: 

Reported Result = (Measured Concentration in the Stack x 

100)/%R. 
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J. Executive Order 12898: Federal Actions to Address 

Environmental Justice in Minority Populations and Low-Income 

Populations 

The EPA believes the human health or environmental risk 

addressed by this action will not have potential 

disproportionately high and adverse human health or 

environmental effects on minority, low-income, or indigenous 

populations because it does not affect the level of protection 

provided to human health or the environment. As explained in the 

December 2014 proposal (79 FR 75672), the EPA determined that 

this final rule will not have disproportionately high and 

adverse human health or environmental effects on minority or 

low-income populations, because it increases the level of 

environmental protection for all affected populations without 

having any disproportionately high and adverse human health or 

environmental effects on any population, including any minority 

or low-income population. Additionally, the agency has conducted 

a proximity analysis for this rulemaking, which is located in 

the docket. (See “EJ Screening Report for Brick and Structural 

Clay,” Docket Item No. EPA-HQ-OAR-2013-0291-0102, and “EJ 

Screening Report for Clay Ceramics,” Docket Item No. EPA-HQ-OAR2013-0290-0241.) 
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K. Congressional Review Act (CRA) 

This action is subject to the CRA, and the EPA will submit 

a rule report to each house of the Congress and to the 

Comptroller General of the United States. This action is a 

“major rule” as defined by 5 U.S.C. 804(2). 
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NESHAP for Brick and Structural Clay Products Manufacturing; and 

NESHAP for Clay Ceramics Manufacturing 

Page 251 of 438 

List of Subjects in 40 CFR Part 63 

Environmental protection, Administrative practice and 

procedure, Air pollution control, Hazardous substances, 

Incorporation by reference, Intergovernmental relations, 

Reporting and recordkeeping requirements. 

Dated: ____________________________. 

____________________________ 

Gina McCarthy, 

Administrator. 
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For the reasons discussed in the preamble, the 

Environmental Protection Agency amends 40 CFR part 63 as 

follows: 

PART 63--NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR 

POLLUTANTS FOR SOURCE CATEGORIES 

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

follows: 

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

2. Section 63.14 is amended by: 

a. Revising paragraphs (f)(1); (g)(74), newly redesignated 

(g)(85) and (l)(2); 

b. Redesignating paragraphs (g)(83) through (95) as 

paragraphs (g)(84) through (96), respectively; 

c. Adding new paragraph (g)(83); 

The revisions and additions read as follows: 

§63.14 Incorporations by reference. 

* * * * * 

(f) * * * 

(1) ANSI/ASME PTC 19.10–1981, Flue and Exhaust Gas Analyses 

[Part 10, Instruments and Apparatus], issued August 31, 1981, 

IBR approved for §§63.309(k), 63.457(k), 63.772(e) and (h), 

63.865(b), 63.1282(d) and (g), 63.1625(b), 63.3166(a), 

63.3360(e), 63.3545(a), 63.3555(a), 63.4166(a), 63.4362(a), 
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63.4766(a), 63.4965(a), 63.5160(d), table 4 to subpart UUUU, 

63.9307(c), 63.9323(a), 63.11148(e), 63.11155(e), 63.11162(f), 

63.11163(g), 63.11410(j), 63.11551(a), 63.11646(a), and 

63.11945, table 5 to subpart DDDDD, table 4 to subpart JJJJJ, 

table 4 to subpart KKKKK, tables 4 and 5 of subpart UUUUU, and 

table 1 to subpart ZZZZZ. 

* * * * * 

(g) * * * 

(74) ASTM D6348-03 (Reapproved 2010), Standard Test Method 

for Determination of Gaseous Compounds by Extractive Direct 

Interface Fourier Transform Infrared (FTIR) Spectroscopy, 

including Annexes A1 through A8, (Approved October 1, 2010), IBR 

approved for tables 4 and 5 to subpart JJJJJ, tables 4 and 6 to 

subpart KKKKK, tables 1, 2, and 5 to subpart UUUUU, and appendix 

B to subpart UUUUU. 

* * * * * 

(83) ASTM D6735-01 (Reapproved 2009), Standard Test Method 

for Measurement of Gaseous Chlorides and Fluorides from Mineral 

Calcining Exhaust Sources—Impinger Method, IBR approved for 

tables 4 and 5 to subpart JJJJJ and tables 4 and 6 to subpart 

KKKKK. 

* * * * * 
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(85) ASTM D6784-02 (Reapproved 2008), Standard Test Method 

for Elemental, Oxidized, Particle-Bound and Total Mercury in 

Flue Gas Generated from Coal-Fired Stationary Sources (Ontario 

Hydro Method), (Approved April 1, 2008), IBR approved for 

§§63.11646(a), 63.11647(a) and (d), tables 1, 2, 5, 11, 12t, and 

13 to subpart DDDDD, tables 4 and 5 to subpart JJJJJ, tables 4 

and 6 to subpart KKKKK, table 4 to subpart JJJJJJ, table 5 to 

subpart UUUUU, and appendix A to subpart UUUUU. 

* * * * * 

(l) * * * 

(2) EPA-454/R-98-015, Office of Air Quality Planning and 

Standards (OAQPS), Fabric Filter Bag Leak Detection Guidance, 

September 1997, IBR approved for §§63.548(e), 63.7525(j), 

63.8450(e), 63.8600(e), and 63.11224(f). 

* * * * * 

3. Part 63 is amended by revising subpart JJJJJ to read as 

follows: 

Subpart JJJJJ--National Emission Standards for Hazardous Air 

Pollutants for Brick and Structural Clay Products Manufacturing 

Sec. 

What This Subpart Covers 

63.8380 What is the purpose of this subpart? 

63.8385 Am I subject to this subpart? 

63.8390 What parts of my plant does this subpart cover? 

63.8395 When do I have to comply with this subpart? 
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Emission Limitations and Work Practice Standards 

63.8405 What emission limitations and work practice standards 

must I meet? 

63.8410 What are my options for meeting the emission 

limitations and work practice standards? 

General Compliance Requirements 

63.8420 What are my general requirements for complying with 

this subpart? 

63.8425 What do I need to know about operation, maintenance, 

and monitoring plans? 

Testing and Initial Compliance Requirements 

63.8435 By what date must I conduct performance tests? 

63.8440 When must I conduct subsequent performance tests? 

63.8445 How do I conduct performance tests and establish 

operating limits? 

63.8450 What are my monitoring installation, operation, and 

maintenance requirements? 

63.8455 How do I demonstrate initial compliance with the 

emission limitations and work practice standards? 

Continuous Compliance Requirements 

63.8465 How do I monitor and collect data to demonstrate 

continuous compliance? 

63.8470 How do I demonstrate continuous compliance with the 

emission limitations and work practice standards? 

Notifications, Reports, and Records 

63.8480 What notifications must I submit and when? 

63.8485 What reports must I submit and when? 

63.8490 What records must I keep? 

63.8495 In what form and for how long must I keep my records? 

Other Requirements and Information 

63.8505 What parts of the General Provisions apply to me? 

63.8510 Who implements and enforces this subpart? 

63.8515 What definitions apply to this subpart? 
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Tables to Subpart JJJJJ of Part 63 

Table 1 to Subpart JJJJJ of Part 63--Emission Limits 

Table 2 to Subpart JJJJJ of Part 63--Operating Limits 

Table 3 to Subpart JJJJJ of Part 63--Work Practice Standards 

Table 4 to Subpart JJJJJ of Part 63--Requirements for 

Performance Tests 

Table 5 to Subpart JJJJJ of Part 63--Initial Compliance with 

Emission Limitations and Work Practice Standards 

Table 6 to Subpart JJJJJ of Part 63--Continuous Compliance with 

Emission Limitations and Work Practice Standards 

Table 7 to Subpart JJJJJ of Part 63--Compliance Dates 

Table 8 to Subpart JJJJJ of Part 63--Requirements for 

Notifications 

Table 9 to Subpart JJJJJ of Part 63--Requirements for Reports 

Table 10 to Subpart JJJJJ of Part 63--Applicability of General 

Provisions to Subpart JJJJJ 

What This Subpart Covers 

§63.8380 What is the purpose of this subpart? 

This subpart establishes national emission limitations for 

hazardous air pollutants (HAP) emitted from brick and structural 

clay products (BSCP) manufacturing facilities. This subpart also 

establishes requirements to demonstrate initial and continuous 

compliance with the emission limitations. 

§63.8385 Am I subject to this subpart? 

You are subject to this subpart if you own or operate a 

BSCP manufacturing facility that is, is located at, or is part 

of, a major source of HAP emissions according to the criteria in 

paragraphs (a) and (b) of this section. 

(a) A BSCP manufacturing facility is a plant site that 

manufactures brick (including, but not limited to, face brick, 
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structural brick, and brick pavers); clay pipe; roof tile; 

extruded floor and wall tile; and/or other extruded, dimensional 

clay products. Brick and structural clay products manufacturing 

facilities typically process raw clay and shale, form the 

processed materials into bricks or shapes, and dry and fire the 

bricks or shapes. A plant site that manufactures refractory 

products, as defined in 40 CFR 63.9824, or clay ceramics, as 

defined in 40 CFR 63.8665, is not a BSCP manufacturing facility. 

(b) A major source of HAP emissions is any stationary 

source or group of stationary sources within a contiguous area 

under common control 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. 

§63.8390 What parts of my plant does this subpart cover? 

(a) This subpart applies to each existing, new, or 

reconstructed affected source at a BSCP manufacturing facility. 

(b) For the purposes of this subpart, the affected sources 

are described in paragraph (b)(1) and (2). 

(1) All tunnel kilns at a BSCP manufacturing facility are 

an affected source. For the remainder of this subpart, a tunnel 

kiln with a design capacity equal to or greater than 

9.07 megagrams per hour (Mg/hr) (10 tons per hour (tph)) of 
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fired product will be called a large tunnel kiln, and a tunnel 

kiln with a design capacity less than 9.07 Mg/hr (10 tph) of 

fired product will be called a small tunnel kiln. 

(2) Each periodic kiln is an affected source. 

(c) Process units not subject to the requirements of this 

subpart are listed in paragraphs (c)(1) through (4) of this 

section. 

(1) Kilns that are used exclusively for setting glazes on 

previously fired products are not subject to the requirements of 

this subpart. 

(2) Raw material processing and handling. 

(3) Dryers. 

(4) Sources covered by subparts KKKKK and SSSSS of this 

part. 

(d) A source is a new affected source if construction of 

the affected source began after December 18, 2014, and you met 

the applicability criteria at the time you began construction. 

(e) An affected source is reconstructed if you meet the 

criteria as defined in §63.2. 

(f) An affected source is existing if it is not new or 

reconstructed. 
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§63.8395 When do I have to comply with this subpart? 

(a) You must comply with this subpart no later than the 

compliance dates in Table 7 to this subpart. 

(b) You must meet the notification requirements in §63.8480 

according to the schedule in §63.8480 and in subpart A of this 

part. Some of the notifications must be submitted before you are 

required to comply with the emission limitations in this 

subpart. 

Emission Limitations and Work Practice Standards 

§63.8405 What emission limitations and work practice standards 

must I meet? 

(a) You must meet each emission limit in Table 1 to this 

subpart that applies to you. 

(b) You must meet each operating limit in Table 2 to this 

subpart that applies to you. 

(c) You must meet each work practice standard in Table 3 to 

this subpart that applies to you. 

§63.8410 What are my options for meeting the emission 

limitations and work practice standards? 

(a) To meet the emission limitations in Tables 1 and 2 to 

this subpart, you must use one or more of the options listed in 

paragraphs (a)(1) and (2) of this section. 
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(1) Emissions control system. Use an emissions capture and 

collection system and an air pollution control device (APCD) and 

demonstrate that the resulting emissions meet the emission 

limits in Table 1 to this subpart, and that the capture and 

collection system and APCD meet the applicable operating limits 

in Table 2 to this subpart. 

(2) Process changes. Use low-HAP raw materials or implement 

manufacturing process changes and demonstrate that the resulting 

emissions or emissions reductions meet the emission limits in 

Table 1 to this subpart. 

(b) To meet the work practice standards for affected 

periodic kilns, you must comply with the requirements listed in 

Table 3 to this subpart. 

(c) To meet the work practice standards for dioxins/furans 

for affected tunnel kilns, you must comply with the requirements 

listed in Table 3 to this subpart. 

(d) To meet the work practice standards for affected tunnel 

kilns during periods of startup and shutdown, you must comply 

with the requirements listed in Table 3 to this subpart. 
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General Compliance Requirements 

§63.8420 What are my general requirements for complying with 

this subpart? 

(a) You must be in compliance with the emission limitations 

(including operating limits) in this subpart at all times, 

except during periods of routine control device maintenance as 

specified in paragraph (d) of this section. 

(b) At all times, you must operate and maintain any 

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 

emissions. 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. During the period between 

the compliance date specified for your affected source in 

§63.8395 and the date upon which continuous monitoring systems 

(CMS) (e.g., continuous parameter monitoring systems) have been 
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installed and verified 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. 

(c) For each affected kiln that is subject to the emission 

limits specified in Table 1 to this subpart, you must prepare 

and implement a written operation, maintenance, and monitoring 

(OM&M) plan according to the requirements in §63.8425. 

(d) If you own or operate an affected kiln that is subject 

to the emission limits specified in Table 1 to this subpart and 

must perform routine maintenance on the control device for that 

kiln, you may bypass the kiln control device and continue 

operating the kiln upon approval by the Administrator provided 

you satisfy the conditions listed in paragraphs (d)(1) through 

(5) of this section. 

(1) You must request a routine control device maintenance 

exemption from the Administrator. Your request must justify the 

need for the routine maintenance on the control device and the 

time required to accomplish the maintenance activities, describe 

the maintenance activities and the frequency of the maintenance 

activities, explain why the maintenance cannot be accomplished 

during kiln shutdowns, describe how you plan to comply with 

paragraph (b) of this section during the maintenance, and 

provide any other documentation required by the Administrator. 
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(2) The routine control device maintenance exemption must 

not exceed 4 percent of the annual operating uptime for each 

kiln. 

(3) The request for the routine control device maintenance 

exemption, if approved by the Administrator, must be 

incorporated by reference in and attached to the affected 

source’s title V permit. 

(4) You must minimize HAP emissions during the period when 

the kiln is operating and the control device is offline by 

complying with the applicable work practice standard in Table 3 

to this subpart. 

(5) You must minimize the time period during which the kiln 

is operating and the control device is offline. 

(e) You must be in compliance with the work practice 

standards in this subpart at all times. 

(f) You must be in compliance with the provisions of 

subpart A of this part, except as noted in Table 10 to this 

subpart. 

§63.8425 What do I need to know about operation, maintenance, 

and monitoring plans? 

(a) For each affected kiln that is subject to the emission 

limits specified in Table 1 to this subpart, you must prepare, 

implement, and revise as necessary an OM&M plan that includes 
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the information in paragraph (b) of this section. Your OM&M plan 

must be available for inspection by the delegated authority upon 

request. 

(b) Your OM&M plan must include, as a minimum, the 

information in paragraphs (b)(1) through (13) of this section. 

(1) Each process and APCD to be monitored, the type of 

monitoring device that will be used, and the operating 

parameters that will be monitored. 

(2) A monitoring schedule that specifies the frequency that 

the parameter values will be determined and recorded. 

(3) The limits for each parameter that represent continuous 

compliance with the emission limitations in §63.8405. The limits 

must be based on values of the monitored parameters recorded 

during performance tests. 

(4) Procedures for the proper operation and routine and 

long-term maintenance of each APCD, including a maintenance and 

inspection schedule that is consistent with the manufacturer’s 

recommendations. 

(5) Procedures for installing the CMS sampling probe or 

other interface at a measurement location relative to each 

affected process unit such that the measurement is 

representative of control of the exhaust emissions (e.g., on or 

downstream of the last APCD). 
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(6) Performance and equipment specifications for the sample 

interface, the pollutant concentration or parametric signal 

analyzer, and the data collection and reduction system. 

(7) Continuous monitoring system performance evaluation 

procedures and acceptance criteria (e.g., calibrations). 

(8) Procedures for the proper operation and maintenance of 

monitoring equipment consistent with the requirements in 

§§63.8450 and 63.8(c)(1), (3), (7), and (8). 

(9) Continuous monitoring system data quality assurance 

procedures consistent with the requirements in §63.8(d)(1) and 

(2). The owner or operator shall keep these written procedures 

on record 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 in §63.8(d)(2) 

is revised, the owner or operator shall keep previous (i.e., 

superseded) versions of the performance evaluation plan on 

record to be made available for inspection, upon request, 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). 
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(10) Continuous monitoring system recordkeeping and 

reporting procedures consistent with the requirements in 

§§63.8485 and 63.8490. 

(11) Procedures for responding to operating parameter 

deviations, including the procedures in paragraphs (b)(11)(i) 

through (iii) of this section. 

(i) Procedures for determining the cause of the operating 

parameter deviation. 

(ii) Actions necessary for correcting the deviation and 

returning the operating parameters to the allowable limits. 

(iii) Procedures for recording the times that the deviation 

began and ended and corrective actions were initiated and 

completed. 

(12) Procedures for keeping records to document compliance. 

(13) If you operate an affected kiln and you plan to take 

the kiln control device out of service for routine maintenance, 

as specified in §63.8420(d), the procedures specified in 

paragraphs (b)(13)(i) and (ii) of this section. 

(i) Procedures for minimizing HAP emissions from the kiln 

during periods of routine maintenance of the kiln control device 

when the kiln is operating and the control device is offline. 
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(ii) Procedures for minimizing the duration of any period 

of routine maintenance on the kiln control device when the kiln 

is operating and the control device is offline. 

(c) Changes to the operating limits in your OM&M plan 

require a new performance test. If you are revising an operating 

limit parameter value, you must meet the requirements in 

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

(1) Submit a notification of performance test to the 

Administrator as specified in §63.7(b). 

(2) After completing the performance tests to demonstrate 

that compliance with the emission limits can be achieved at the 

revised operating limit parameter value, you must submit the 

performance test results and the revised operating limits as 

part of the Notification of Compliance Status required under 

§63.9(h). 

(d) If you are revising the inspection and maintenance 

procedures in your OM&M plan, you do not need to conduct a new 

performance test. 

Testing and Initial Compliance Requirements 

§63.8435 By what date must I conduct performance tests? 

For each affected kiln that is subject to the emission 

limits specified in Table 1 to this subpart, you must conduct 

performance tests within 180 calendar days after the compliance 
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date that is specified for your source in §63.8395 and according 

to the provisions in §63.7(a)(2). 

§63.8440 When must I conduct subsequent performance tests? 

(a) For each affected kiln that is subject to the emission 

limits specified in Table 1 to this subpart, you must conduct a 

performance test before renewing your 40 CFR part 70 operating 

permit or at least every 5 years following the initial 

performance test. 

(b) You must conduct a performance test when you want to 

change the parameter value for any operating limit specified in 

your OM&M plan. 

§63.8445 How do I conduct performance tests and establish 

operating limits? 

(a) You must conduct each performance test in Table 4 to 

this subpart that applies to you. 

(b) Before conducting the performance test, you must 

install and calibrate all monitoring equipment. 

(c) Each performance test must be conducted according to 

the requirements in §63.7 and under the specific conditions in 

Table 4 to this subpart. 

(d) Performance tests shall be conducted under such 

conditions as the Administrator specifies to you based on 

representative performance of the affected source for the period 
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being tested. Representative conditions exclude periods of 

startup and shutdown. 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 shall make available to the Administrator such 

records as may be necessary to determine the conditions of 

performance tests. 

(e) You must conduct at least three separate test runs for 

each performance test required in this section, as specified in 

§63.7(e)(3). Each test run must last at least 1 hour. 

(f) You must use the data gathered during the performance 

test and the equations in paragraphs (f)(1) and (2) of this 

section to determine compliance with the emission limitations. 

(1) To determine compliance with the production-based 

particulate matter (PM) and mercury (Hg) emission limits in 

Table 1 to this subpart, you must calculate your mass emissions 

per unit of production for each test run using Equation 1: 

P

ER MP  (Eq. 1) 

Where: 

MP = mass per unit of production, kilograms (pounds) of 

pollutant per megagram (ton) of fired product 
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ER = mass emission rate of pollutant (PM or Hg) during each 

performance test run, kilograms (pounds) per hour 

P = production rate during each performance test run, 

megagrams (tons) of fired product per hour. 

(2) To determine compliance with the health-based standard 

for acid gas HAP for BSCP manufacturing facilities in Table 1 to 

this subpart, you must: 

(i) Calculate the HCl-equivalent emissions for HF, HCl, and 

Cl2 for each tunnel kiln at your facility using Equation 2: 

































 



 



















  

2

2

Cl

HCl

Cl

HF

HCl

i HCl HF RfC

RfC E

RfC

RfC E E E (Eq. 2) 

Where: 

Ei = HCl-equivalent emissions for kiln i, kilograms (pounds) 

per hour 

EHCl = emissions of HCl, kilograms (pounds) per hour 

EHF = emissions of HF, kilograms (pounds) per hour 

ECl2 = emissions of Cl2, kilograms (pounds) per hour 

RfCHCl = reference concentration for HCl, 20 micrograms per 

cubic meter 

RfCHF = reference concentration for HF, 14 micrograms per cubic 

meter 

RfCCl2 = reference concentration for Cl2, 0.15 micrograms per 

cubic meter 

(ii) If you have multiple tunnel kilns at your facility, 

sum the HCl-equivalent values for all tunnel kilns at the 

facility using Equation 3: 
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



n

i

Etotal Ei

1

 (Eq. 3) 

Where: 

Etotal = HCl-equivalent emissions for total of all kilns at 

facility, kilograms (pounds) per hour 

Ei = HCl-equivalent emissions for kiln i, kilograms (pounds) 

per hour 

n = number of tunnel kilns at facility 

(iii) Compare this value to the health-based standard in 

Table 1 to this subpart. 

(g) You must establish each site-specific operating limit 

in Table 2 to this subpart that applies to you as specified in 

paragraph (g)(1) of this section and in Table 4 to this subpart. 

(1)(i) If you do not have an APCD installed on your kiln, 

calculate the maximum potential HCl-equivalent emissions for HF, 

HCl, and Cl2 for each tunnel kiln at your facility using Equation 

4: 

       













































  

2

max 2

Cl

HCl

iCl

HF

HCl

i i iHCl iHF RfC

RfC MP

RfC

RfC E Cap MP MP (Eq. 4) 

Where: 

Emax i = maximum potential HCl-equivalent emissions for kiln i, 

kilograms (pounds) per hour 

Capi = design capacity for kiln i, megagrams (tons) of fired 

product per hour 

MPiHCl = mass of HCl per unit of production for kiln i, 

kilograms (pounds) of HCl per megagram (ton) of fired 
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product 

MPiHF = mass of HF per unit of production for kiln i, kilograms 

(pounds) of HF per megagram (ton) of fired product 

MPiCl2 = mass of Cl2 per unit of production for kiln i, 

kilograms (pounds) of Cl2 per megagram (ton) of fired 

product 

RfCHCl = reference concentration for HCl, 20 micrograms per 

cubic meter 

RfCHF = reference concentration for HF, 14 micrograms per cubic 

meter 

RfCCl2 = reference concentration for Cl2, 0.15 micrograms per 

cubic meter 

(ii) If you have multiple tunnel kilns at your facility, 

sum the maximum potential HCl-equivalent values for all tunnel 

kilns at the facility using Equation 5: 





n

i

E total E i

1

max max (Eq. 5) 

Where: 

Emax total = maximum potential HCl-equivalent emissions for total of 

all kilns at facility, kilograms (pounds) per hour 

Emax i = maximum potential HCl-equivalent emissions for kiln i, 

kilograms (pounds) per hour 

n = number of tunnel kilns at facility 

(iii) If you have a single tunnel kiln at your facility and 

the total facility maximum potential HCl-equivalent emissions 

(Emax total) are greater than the HCl-equivalent limit in Table 1 

to this subpart, determine the maximum process rate for the 

tunnel kiln using Equation 6 that would ensure the total 
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facility maximum potential HCl-equivalent emissions remain at or 

below the HCl-equivalent limit. The maximum process rate would 

become your operating limit for process rate and must be 

included in your OM&M plan. 

     



















































2

2

max

Cl

HCl

iCl

HF

HCl

iHCl iHF

i

RfC

RfC MP

RfC

RfC MP MP

HCl - eq P (Eq. 6) 

Where: 

Pmax i = maximum process rate for kiln i, megagrams (tons) per 

hour 

HCl-eq = HCl-equivalent limit in Table 1 to this subpart, 26 

kilograms (57 pounds) per hour 

MPiHCl = mass of HCl per unit of production for kiln i, 

kilograms (pounds) of HCl per megagram (ton) of fired 

product 

MPiHF = mass of HF per unit of production for kiln i, kilograms 

(pounds) of HF per megagram (ton) of fired product 

MPiCl2 = mass of Cl2 per unit of production for kiln i, 

kilograms (pounds) of Cl2 per megagram (ton) of fired 

product 

RfCHCl = reference concentration for HCl, 20 micrograms per 

cubic meter 

RfCHF = reference concentration for HF, 14 micrograms per cubic 

meter 

RfCCl2 = reference concentration for Cl2, 0.15 micrograms per 

cubic meter 

(iv) If you have multiple tunnel kilns at your facility and 

the total facility maximum potential HCl-equivalent emissions 

(Emax total) are greater than the HCl-equivalent limit in Table 1 
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to this subpart, determine the combination of maximum process 

rates that would ensure that total facility maximum potential 

HCl-equivalent remains at or below the HCl-equivalent limit. The 

maximum process rates would become your operating limits for 

process rate and must be included in your OM&M plan. 

(h) For each affected kiln that is subject to the emission 

limits specified in Table 1 to this subpart and is equipped with 

an APCD that is not addressed in Table 2 to this subpart or that 

is using process changes as a means of meeting the emission 

limits in Table 1 to this subpart, you must meet the 

requirements in §63.8(f) and paragraphs (h)(1) and (2) of this 

section. 

(1) Submit a request for approval of alternative monitoring 

procedures to the Administrator no later than the notification 

of intent to conduct a performance test. The request must 

contain the information specified in paragraphs (h)(1)(i) 

through (iv) of this section. 

(i) A description of the alternative APCD or process 

changes. 

(ii) The type of monitoring device or procedure that will 

be used. 

(iii) The operating parameters that will be monitored. 
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(iv) The frequency that the operating parameter values will 

be determined and recorded to establish continuous compliance 

with the operating limits. 

(2) Establish site-specific operating limits during the 

performance test based on the information included in the 

approved alternative monitoring procedures request and, as 

applicable, as specified in Table 4 to this subpart. 

§63.8450 What are my monitoring installation, operation, and 

maintenance requirements? 

(a) You must install, operate, and maintain each CMS 

according to your OM&M plan and the requirements in paragraphs 

(a)(1) through (5) of this section. 

(1) Conduct a performance evaluation of each CMS according 

to your OM&M plan. 

(2) The CMS must complete a minimum of one cycle of 

operation for each successive 15-minute period. To have a valid 

hour of data, you must have at least three of four equally 

spaced data values (or at least 75 percent if you collect more 

than four data values per hour) for that hour (not including 

startup, shutdown, malfunction, out-of-control periods, or 

periods of routine control device maintenance covered by a 

routine control device maintenance exemption as specified in 

§63.8420(d)). 
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(3) Determine and record the 3-hour block averages of all 

recorded readings, calculated after every 3 hours of operation 

as the average of the previous 3 operating hours. To calculate 

the average for each 3-hour average period, you must have at 

least 75 percent of the recorded readings for that period (not 

including startup, shutdown, malfunction, out-of-control 

periods, or periods of routine control device maintenance 

covered by a routine control device maintenance exemption as 

specified in §63.8420(d)). 

(4) Record the results of each inspection, calibration, and 

validation check. 

(5) At all times, maintain the monitoring equipment 

including, but not limited to, maintaining necessary parts for 

routine repairs of the monitoring equipment. 

(b) For each liquid flow measurement device, you must meet 

the requirements in paragraphs (a)(1) through (5) and paragraphs 

(b)(1) through (3) of this section. 

(1) Locate the flow sensor in a position that provides a 

representative flowrate. 

(2) Use a flow sensor with a minimum measurement 

sensitivity of 2 percent of the liquid flowrate. 

(3) At least semiannually, conduct a flow sensor 

calibration check. 
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(c) For each pressure measurement device, you must meet the 

requirements in paragraphs (a)(1) through (5) and paragraphs 

(c)(1) through (7) of this section. 

(1) Locate the pressure sensor(s) in or as close to a 

position that provides a representative measurement of the 

pressure. 

(2) Minimize or eliminate pulsating pressure, vibration, 

and internal and external corrosion. 

(3) Use a gauge with a minimum measurement sensitivity of 

0.5 inch of water or a transducer with a minimum measurement 

sensitivity of 1 percent of the pressure range. 

(4) Check the pressure tap daily to ensure that it is not 

plugged. 

(5) Using a manometer, check gauge calibration quarterly 

and transducer calibration monthly. 

(6) Any time the sensor exceeds the manufacturer’s 

specified maximum operating pressure range, conduct calibration 

checks or install a new pressure sensor. 

(7) At least monthly, inspect all components for integrity, 

all electrical connections for continuity, and all mechanical 

connections for leakage. 
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(d) For each pH measurement device, you must meet the 

requirements in paragraphs (a)(1) through (5) and paragraphs 

(d)(1) through (4) of this section. 

(1) Locate the pH sensor in a position that provides a 

representative measurement of pH. 

(2) Ensure the sample is properly mixed and representative 

of the fluid to be measured. 

(3) Check the pH meter’s calibration on at least two points 

every 8 hours of process operation. 

(4) At least monthly, inspect all components for integrity 

and all electrical connections for continuity. 

(e) For each bag leak detection system, you must meet the 

requirements in paragraphs (e)(1) through (11) of this section. 

(1) Each triboelectric bag leak detection system must be 

installed, calibrated, operated, and maintained according to the 

“Fabric Filter Bag Leak Detection Guidance,” (EPA-454/R-98-015, 

September 1997) (incorporated by reference, see §63.14). Other 

types of bag leak detection systems must be installed, operated, 

calibrated, and maintained in a manner consistent with the 

manufacturer’s written specifications and recommendations. 

(2) The bag leak detection system must be certified by the 

manufacturer to be capable of detecting PM emissions at 
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concentrations of 10 milligrams per actual cubic meter 

(0.0044 grains per actual cubic foot) or less. 

(3) The bag leak detection system sensor must provide an 

output of relative PM loadings. 

(4) The bag leak detection system must be equipped with a 

device to continuously record the output signal from the sensor. 

(5) The bag leak detection system must be equipped with an 

audible alarm system that will sound automatically when an 

increase in relative PM emissions over a preset level is 

detected. The alarm must be located where it is easily heard by 

plant operating personnel. 

(6) For positive pressure fabric filter systems, a bag leak 

detector must be installed in each baghouse compartment or cell. 

(7) For negative pressure or induced air fabric filters, 

the bag leak detector must be installed downstream of the fabric 

filter. 

(8) Where multiple detectors are required, the system’s 

instrumentation and alarm may be shared among detectors. 

(9) The baseline output must be established by adjusting 

the range and the averaging period of the device and 

establishing the alarm set points and the alarm delay time 

according to section 5.0 of the “Fabric Filter Bag Leak 
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Detection Guidance,” (EPA-454/R-98-015, September 1997) 

(incorporated by reference, see §63.14). 

(10) Following initial adjustment of the system, the 

sensitivity or range, averaging period, alarm set points, or 

alarm delay time may not be adjusted except as detailed in your 

OM&M plan. In no case may the sensitivity be increased by more 

than 100 percent or decreased more than 50 percent over a 365-

day period unless such adjustment follows a complete fabric 

filter inspection that demonstrates that the fabric filter is in 

good operating condition, as defined in section 5.2 of the 

“Fabric Filter Bag Leak Detection Guidance,” (EPA-454/R-98-015, 

September 1997) (incorporated by reference, see §63.14). Record 

each adjustment. 

(11) Record the results of each inspection, calibration, 

and validation check. 

(f) For each lime, chemical, or carbon feed rate 

measurement device, you must meet the requirements in paragraphs 

(a)(1) through (5) and paragraphs (f)(1) and (2) of this 

section. 

(1) Locate the measurement device in a position that 

provides a representative feed rate measurement. 

(2) At least semiannually, conduct a calibration check. 
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(g) For each limestone feed system on a dry limestone 

adsorber (DLA), you must meet the requirements in paragraphs 

(a)(1), (4), and (5) of this section and must ensure on a 

monthly basis that the feed system replaces limestone at least 

as frequently as the schedule set during the performance test. 

(h) Requests for approval of alternate monitoring 

procedures must meet the requirements in §§63.8445(h) and 

63.8(f). 

§63.8455 How do I demonstrate initial compliance with the 

emission limitations and work practice standards? 

(a) You must demonstrate initial compliance with each 

emission limitation and work practice standard that applies to 

you according to Table 5 to this subpart. 

(b) You must establish each site-specific operating limit 

in Table 2 to this subpart that applies to you according to the 

requirements in §63.8445 and Table 4 to this subpart. 

(c) You must submit the Notification of Compliance Status 

containing the results of the initial compliance demonstration 

according to the requirements in §63.8480(c). 
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Continuous Compliance Requirements 

§63.8465 How do I monitor and collect data to demonstrate 

continuous compliance? 

(a) You must monitor and collect data according to this 

section. 

(b) Except for periods of monitor malfunctions, associated 

repairs, and required quality assurance or control activities 

(including, as applicable, calibration checks and required zero 

and span adjustments), you must monitor continuously (or collect 

data at all required intervals) at all times that the affected 

source is operating. This includes periods of startup, shutdown, 

malfunction, and routine control device maintenance as specified 

in §63.8420(d) when the affected source is operating. 

(c) You may not use data recorded during monitoring 

malfunctions, associated repairs, out-of-control periods, or 

required quality assurance or control activities for purposes of 

calculating data averages. You must use all the valid data 

collected during all other periods in assessing compliance. Any 

averaging period for which you do not have valid monitoring data 

and such data are required constitutes a deviation from the 

monitoring requirements. 
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§63.8470 How do I demonstrate continuous compliance with the 

emission limitations and work practice standards? 

(a) You must demonstrate continuous compliance with each 

emission limit, operating limit, and work practice standard in 

Tables 1, 2, and 3 to this subpart that applies to you according 

to the methods specified in Table 6 to this subpart. 

(b) For each affected kiln that is subject to the emission 

limits specified in Table 1 to this subpart and is equipped with 

an APCD that is not addressed in Table 2 to this subpart, or 

that is using process changes as a means of meeting the emission 

limits in Table 1 to this subpart, you must demonstrate 

continuous compliance with each emission limit in Table 1 to 

this subpart, and each operating limit established as required 

in §63.8445(h)(2) according to the methods specified in your 

approved alternative monitoring procedures request, as described 

in §§63.8445(h)(1) and 63.8(f). 

(c) You must report each instance in which you did not meet 

each emission limit and each operating limit in this subpart 

that applies to you. These instances are deviations from the 

emission limitations in this subpart. These deviations must be 

reported according to the requirements in §63.8485(c)(9). 

(d) [Reserved] 
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(e) You must demonstrate continuous compliance with the 

operating limits in Table 2 to this subpart for visible 

emissions (VE) from tunnel kilns that are uncontrolled or 

equipped with DLA, dry lime injection fabric filter (DIFF), dry 

lime scrubber/fabric filter (DLS/FF), or other dry control 

device by monitoring VE at each kiln stack according to the 

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

(1) Perform daily VE observations of each kiln stack 

according to the procedures of Method 22 of 40 CFR part 60, 

appendix A-7. You must conduct the Method 22 test while the 

affected source is operating under normal conditions. The 

duration of each Method 22 test must be at least 15 minutes. 

(2) If VE are observed during any daily test conducted 

using Method 22 of 40 CFR part 60, appendix A-7, you must 

promptly initiate and complete corrective actions according to 

your OM&M plan. If no VE are observed in 30 consecutive daily 

Method 22 tests for any kiln stack, you may decrease the 

frequency of Method 22 testing from daily to weekly for that 

kiln stack. If VE are observed during any weekly test, you must 

promptly initiate and complete corrective actions according to 

your OM&M plan, resume Method 22 testing of that kiln stack on a 

daily basis, and maintain that schedule until no VE are observed 
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in 30 consecutive daily tests, at which time you may again 

decrease the frequency of Method 22 testing to a weekly basis. 

(3) If VE are observed during any test conducted using 

Method 22 of 40 CFR part 60, appendix A-7, you must report these 

deviations by following the requirements in §63.8485. 

Notifications, Reports, and Records 

§63.8480 What notifications must I submit and when? 

(a) You must submit all of the notifications in §§63.7(b) 

and (c), 63.8(f)(4), and 63.9(b) through (e), (g)(1), and (h) 

that apply to you, by the dates specified. 

(b) You must submit all of the notifications specified in 

Table 8 to this subpart that apply to you, by the dates 

specified. 

(c) If you are required to conduct a performance test or 

other initial compliance demonstration as specified in Tables 4 

and 5 to this subpart, your Notification of Compliance Status as 

specified in Table 8 to this subpart must include the 

information in paragraphs (c)(1) through (3) of this section. 

(1) The requirements in §63.9(h)(2)(i). 

(2) The operating limit parameter values established for 

each affected source with supporting documentation and a 

description of the procedure used to establish the values. 
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(3) For each APCD that includes a fabric filter, if a bag 

leak detection system is used, analysis and supporting 

documentation demonstrating conformance with EPA guidance and 

specifications for bag leak detection systems in §63.8450(e). 

§63.8485 What reports must I submit and when? 

(a) You must submit each report in Table 9 to this subpart 

that applies to you. 

(b) Unless the Administrator has approved a different 

schedule for submission of reports under §63.10(a), you must 

submit each report by the date in Table 9 to this subpart and as 

specified 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 §63.8395 and ending on either June 30 or 

December 31. The first reporting period must be at least 

6 months, but less than 12 months. For example, if your 

compliance date is March 1, then the first semiannual reporting 

period would begin on March 1 and end on December 31. 

(2) The first compliance report must be postmarked or 

delivered no later than July 31 or January 31 for compliance 

periods ending on June 30 and December 31, respectively. 
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(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 for compliance 

periods ending on June 30 and December 31, respectively. 

(5) For each affected source that is subject to permitting 

regulations pursuant to 40 CFR part 70 or 40 CFR part 71, if the 

permitting authority has established dates for submitting 

semiannual reports pursuant to 40 CFR 70.6(a)(3)(iii)(A) or 40 

CFR 71.6(a)(3)(iii)(A), you may submit the first and subsequent 

compliance reports according to the dates the permitting 

authority has established instead of the dates in paragraphs 

(b)(1) through (4) of this section. 

(c) The compliance report must contain the information in 

paragraphs (c)(1) through (8) of this section. 

(1) Company name and address. 

(2) Statement by a responsible official with that 

official’s name, title, and signature, certifying that, based on 

information and belief formed after reasonable inquiry, the 

statements and information in the report are true, accurate, and 

complete. 
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(3) Date of report and beginning and ending dates of the 

reporting period. 

(4) A description of control device maintenance performed 

while the control device was offline and the kiln controlled by 

the control device was operating, including the information 

specified in paragraphs (c)(4)(i) through (iii) of this section. 

(i) The date and time when the control device was shut down 

and restarted. 

(ii) Identification of the kiln that was operating and the 

number of hours that the kiln operated while the control device 

was offline. 

(iii) A statement of whether or not the control device 

maintenance was included in your approved routine control device 

maintenance exemption developed as specified in §63.8420(d). If 

the control device maintenance was included in your approved 

routine control device maintenance exemption, then you must 

report the information in paragraphs (c)(4)(iii)(A) through (C) 

of this section. 

(A) The total amount of time that the kiln controlled by 

the control device operated during the current semiannual 

compliance period and during the previous semiannual compliance 

period. 
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(B) The amount of time that each kiln controlled by the 

control device operated while the control device was offline for 

maintenance covered under the routine control device maintenance 

exemption during the current semiannual compliance period and 

during the previous semiannual compliance period. 

(C) Based on the information recorded under paragraphs 

(c)(4)(iii)(A) and (B) of this section, compute the annual 

percent of kiln operating uptime during which the control device 

was offline for routine maintenance using Equation 7. 

  100

p c

p c

KU KU

DT DT

RM



  (Eq. 7) 

Where: 

RM = Annual percentage of kiln uptime during which control 

device was offline for routine control device maintenance 

DTp = Control device downtime claimed under the routine control 

device maintenance exemption for the previous semiannual 

compliance period 

DTc = Control device downtime claimed under the routine control 

device maintenance exemption for the current semiannual 

compliance period 

KUp = Kiln uptime for the previous semiannual compliance period 

KUc = Kiln uptime for the current semiannual compliance period 

(5) A report of the most recent burner tune-up conducted to 

comply with the dioxin/furan work practice standard in Table 3 

to this subpart. 
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(6) If there are no deviations from any emission 

limitations (emission limits or operating limits) that apply to 

you, the compliance report must contain a statement that there 

were no deviations from the emission limitations during the 

reporting period. 

(7) If there were no periods during which the CMS was outof-control as specified in your OM&M plan, the compliance report 

must contain a statement that there were no periods during which 

the CMS was out-of-control during the reporting period. 

(8) The first compliance report must contain the startup 

push rate for each kiln, the minimum APCD inlet temperature for 

each APCD, and the temperature profile for each kiln without an 

APCD. 

(9) For each deviation that occurs at an affected source, 

report such events in the compliance report by including the 

information in paragraphs (c)(9)(i) through (iii) of this 

section. 

(i) The date, time, and duration of the deviation. 

(ii) A list of the affected sources or equipment for which 

the deviation occurred. 

(iii) An estimate of the quantity of each regulated 

pollutant emitted over any emission limit, and a description of 

the method used to estimate the emissions. 
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(d) For each deviation from an emission limitation 

(emission limit or operating limit) occurring at an affected 

source where you are using a CMS to comply with the emission 

limitations in this subpart, you must include the information in 

paragraphs (c)(1) through (4) and (c)(9), and paragraphs (d)(1) 

through (11) of this section. This includes periods of startup, 

shutdown, and routine control device maintenance. 

(1) The total operating time of each affected source during 

the reporting period. 

(2) The date and time that each CMS was inoperative, except 

for zero (low-level) and high-level checks. 

(3) The date, time, and duration that each CMS was out-ofcontrol, including the pertinent information in your OM&M plan. 

(4) Whether each deviation occurred during routine control 

device maintenance covered in your approved routine control 

device maintenance exemption or during another period, and the 

cause of each deviation (including unknown cause, if 

applicable). 

(5) A description of any corrective action taken to return 

the affected unit to its normal or usual manner of operation. 

(6) A breakdown of the total duration of the deviations 

during the reporting period into those that were due to startup, 
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shutdown, control equipment problems, process problems, other 

known causes, and other unknown causes. 

(7) A summary of the total duration of CMS downtime during 

the reporting period and the total duration of CMS downtime as a 

percent of the total source operating time during that reporting 

period. 

(8) A brief description of the process units. 

(9) A brief description of the CMS. 

(10) The date of the latest CMS certification or audit. 

(11) A description of any changes in CMS, processes, or 

control equipment since the last reporting period. 

(e) If you have obtained a title V operating permit 

according to 40 CFR part 70 or 40 CFR part 71, you must report 

all deviations as defined in this subpart in the semiannual 

monitoring report required by 40 CFR 70.6(a)(3)(iii)(A) or 40 

CFR 71.6(a)(3)(iii)(A). If you submit a compliance report 

according to Table 9 to this subpart along with, or as part of, 

the semiannual monitoring report required by 40 CFR 

70.6(a)(3)(iii)(A) or 40 CFR 71.6(a)(3)(iii)(A), and the 

compliance report includes all required information concerning 

deviations from any emission limitation (including any operating 

limit), then submitting the compliance report will satisfy any 

obligation to report the same deviations in the semiannual 
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monitoring report. However, submitting a compliance report will 

not otherwise affect any obligation you may have to report 

deviations from permit requirements to the permitting authority. 

(f) Within 60 calendar days after the date of completing 

each performance test (as defined in §63.2) required by this 

subpart, you must submit the results of the performance tests 

following the procedure specified in either paragraph (f)(1) or 

(f)(2) of this section. 

(1) For data collected using test methods supported by the 

EPA’s Electronic Reporting Tool (ERT) as listed on the EPA’s ERT 

Web site (http://www.epa.gov/ttn/chief/ert/index.html), you must 

submit the results of the performance test to the EPA via the 

Compliance and Emissions Data Reporting Interface (CEDRI). CEDRI 

can be accessed through the EPA’s Central Data Exchange (CDX) 

(http://cdx.epa.gov/epa_home.asp). Performance test data must be 

submitted in a file format generated through the use of the 

EPA’s ERT. Alternatively, you may submit performance test data 

in an electronic file format consistent with the extensible 

markup language (XML) schema listed on the EPA’s ERT Web site 

once the XML schema is available. 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 or an alternate 
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electronic file consistent with the XML schema listed on the 

EPA’s ERT Web site, including information claimed to be CBI, on 

a compact disc, flash drive, or other commonly used electronic 

storage media to the EPA. The electronic media must be clearly 

marked as CBI and mailed to U.S. EPA/OAPQS/CORE CBI Office, 

Attention: Group Leader, Measurement Policy Group, MD C404-02, 

4930 Old Page Rd., Durham, NC 27703. The same ERT or alternate 

file with the CBI omitted must be submitted to the EPA via the 

EPA’s CDX as described earlier in this paragraph. 

(2) For data collected using test methods that are not 

supported by the EPA’s ERT as listed on the EPA’s ERT Web site, 

you must submit the results of the performance test to the 

Administrator at the appropriate address listed in §63.13. 

§63.8490 What records must I keep? 

(a) You must keep the records listed 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) Records of performance tests as required in 

§63.10(b)(2)(viii). 
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(3) Records relating to control device maintenance and 

documentation of your approved routine control device 

maintenance exemption, if you request such an exemption under 

§63.8420(d). 

(b) You must keep the records required in Table 6 to this 

subpart to show continuous compliance with each emission 

limitation and work practice standard that applies to you. 

(c) You must also maintain the records listed in paragraphs 

(c)(1) through (11) of this section. 

(1) For each bag leak detection system, records of each 

alarm, the time of the alarm, the time corrective action was 

initiated and completed, and a brief description of the cause of 

the alarm and the corrective action taken. 

(2) For each deviation, record the information in 

paragraphs (c)(2)(i) through (iv) of this section. 

(i) The date, time, and duration of the deviation. 

(ii) A list of the affected sources or equipment. 

(iii) An estimate of the quantity of each regulated 

pollutant emitted over any emission limit and a description of 

the method used to estimate the emissions. 

(iv) Actions taken to minimize emissions in accordance with 

§63.8420(b) and any corrective actions taken to return the 

affected unit to its normal or usual manner of operation. 
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(3) For each affected source, records of production rates 

on a fired-product basis. 

(4) Records for any approved alternative monitoring or test 

procedures. 

(5) Records of maintenance and inspections performed on the 

APCD. 

(6) Current copies of your OM&M plan, including any 

revisions, with records documenting conformance. 

(7) Logs of the information required in paragraphs 

(c)(7)(i) through (iii) of this section to document proper 

operation of your periodic kiln. 

(i) Records of the firing time and temperature cycle for 

each product produced in each periodic kiln. If all periodic 

kilns use the same time and temperature cycles, one copy may be 

maintained for each kiln. Reference numbers must be assigned to 

use in log sheets. 

(ii) For each periodic kiln, a log that details the type of 

product fired in each batch, the corresponding time and 

temperature protocol reference number, and an indication of 

whether the appropriate time and temperature cycle was fired. 

(iii) For each periodic kiln, a log of the actual tonnage 

of product fired in the periodic kiln and an indication of 
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whether the tonnage was below the maximum tonnage for that 

specific kiln. 

(8) Logs of the maintenance procedures used to demonstrate 

compliance with the maintenance requirements of the periodic 

kiln work practice standards specified in Table 3 to this 

subpart. 

(9) Records of burner tune-ups used to comply with the 

dioxin/furan work practice standard for tunnel kilns. 

(10) For periods of startup and shutdown, records of the 

following information: 

(i) The date, time, and duration of each startup and/or 

shutdown period, recording the periods when the affected source 

was subject to the standard applicable to startup and shutdown. 

(ii) For periods of startup, the kiln push rate and kiln 

exhaust temperature prior to the time the kiln exhaust reaches 

the minimum APCD inlet temperature (for a kiln with an APCD) or 

the kiln temperature profile is attained (for a kiln with no 

APCD). 

(iii) For periods of shutdown, the kiln push rate and kiln 

exhaust temperature after the time the kiln exhaust falls below 

the minimum APCD inlet temperature (for a kiln with an APCD) or 

the kiln temperature profile is no longer maintained (for a kiln 

with no APCD). 
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(11) All site-specific parameters, temperature profiles, 

and procedures required to be established or developed according 

to the applicable work practice standards in Table 3 to this 

subpart. 

§63.8495 In what form and for how long must I keep my records? 

(a) Your records must be in a form suitable and readily 

available for expeditious review, according to §63.10(b)(1). 

(b) 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. 

(c) You must keep each record onsite 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 may keep the records offsite for the remaining 3 years. 

Other Requirements and Information 

§63.8505 What parts of the General Provisions apply to me? 

Table 10 to this subpart shows which parts of the General 

Provisions in §§63.1 through 63.16 apply to you. 

§63.8510 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 
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agency, in addition to the U.S. EPA, has the authority to 

implement and enforce this subpart. You should contact your U.S. 

EPA Regional Office to find out if implementation and 

enforcement of 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 

subpart E of this part, 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 cannot be delegated to state, 

local, or tribal agencies are as specified in paragraphs (c)(1) 

through (6) of this section. 

(1) Approval of alternatives to the applicability 

requirements in §§63.8385 and 63.8390, the compliance date 

requirements in §63.8395, and the non-opacity emission 

limitations in §63.8405. 

(2) Approval of major changes to test methods under 

§63.7(e)(2)(ii) and (f) and as defined in §63.90. 

(3) Approval of major changes to monitoring under §63.8(f) 

and as defined in §63.90. 
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(4) Approval of major changes to recordkeeping and 

reporting under §63.10(f) and as defined in §63.90. 

(5) Approval of an alternative to any electronic reporting 

to the EPA required by this subpart. 

(6) Approval of a routine control device maintenance 

exemption under §63.8420(d). 

§63.8515 What definitions apply to this subpart? 

Terms used in this subpart are defined in the Clean Air 

Act, in §63.2, and in this section as follows: 

Air pollution control device (APCD) means any equipment 

that reduces the quantity of a pollutant that is emitted to the 

air. 

Bag leak detection system means an instrument that is 

capable of monitoring PM loadings in the exhaust of a fabric 

filter in order to detect bag failures. A bag leak detection 

system includes, but is not limited to, an instrument that 

operates on triboelectric, light-scattering, lighttransmittance, or other effects to monitor relative PM loadings. 

Brick and structural clay products (BSCP) manufacturing 

facility means a plant site that manufactures brick (including, 

but not limited to, face brick, structural brick, and brick 

pavers); clay pipe; roof tile; extruded floor and wall tile; 

and/or other extruded, dimensional clay products. Brick and 
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structural clay products manufacturing facilities typically 

process raw clay and shale, form the processed materials into 

bricks or shapes, and dry and fire the bricks or shapes. A plant 

site that manufactures refractory products, as defined in 40 CFR 

63.9824, or clay ceramics, as defined in 40 CFR 63.8665, is not 

a BSCP manufacturing facility. 

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 

limitation (including any 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 for any 

affected source required to obtain such a permit. 

Dry lime injection fabric filter (DIFF) means an APCD that 

includes continuous injection of hydrated lime or other sorbent 

into a duct or reaction chamber followed by a fabric filter. 

Dry lime scrubber/fabric filter (DLS/FF) means an APCD that 

includes continuous injection of humidified hydrated lime or 

other sorbent into a reaction chamber followed by a fabric 
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filter. These systems typically include recirculation of some of 

the sorbent. 

Dry limestone adsorber (DLA) means an APCD that includes a 

limestone storage bin, a reaction chamber that is essentially a 

packed tower filled with limestone, and may or may not include a 

peeling drum that mechanically scrapes reacted limestone to 

regenerate the stone for reuse. 

Emission limitation means any emission limit or operating 

limit. 

Fabric filter means an APCD used to capture PM by filtering 

a gas stream through filter media; also known as a baghouse. 

Initial startup means: 

(1) for a new or reconstructed tunnel kiln controlled with 

a DLA, the time at which the temperature in the kiln first 

reaches 260°C (500°F) and the kiln contains product; or 

(2) for a new or reconstructed tunnel kiln controlled with 

a DIFF, DLS/FF, or wet scrubber (WS), the time at which the kiln 

first reaches a level of production that is equal to 75 percent 

of the kiln design capacity or 12 months after the affected 

source begins firing BSCP, whichever is earlier. 

Fired product means brick or structural clay products that 

have gone through the firing process via kilns. 
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Kiln exhaust process stream means the portion of the 

exhaust from a tunnel kiln that exhausts directly to the 

atmosphere (or to an APCD), rather than to a sawdust dryer. 

Large tunnel kiln means a tunnel kiln (existing, new, or 

reconstructed) with a design capacity equal to or greater than 

9.07 Mg/hr (10 tph) of fired product. 

Minimum APCD inlet temperature means the minimum 

temperature that kiln exhaust can be vented to the APCD that 

ensures the long-term integrity of the APCD. 

Particulate matter (PM) means, for purposes of this 

subpart, emissions of PM that serve as a measure of total 

particulate emissions, as measured by Method 5 (40 CFR part 60, 

appendix A-3) or Method 29 (40 CFR part 60, appendix A-8), and 

as a surrogate for non-mercury metal HAP contained in the 

particulates including, but not limited to, antimony, arsenic, 

beryllium, cadmium, chromium, cobalt, lead, manganese, nickel, 

and selenium. 

Periodic kiln means a batch firing kiln. 

Plant site means all contiguous or adjoining property that 

is under common control, including properties that are separated 

only by a road or other public right-of-way. Common control 

includes properties that are owned, leased, or operated by the 
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same entity, parent entity, subsidiary, or any combination 

thereof. 

Responsible official means responsible official as defined 

in 40 CFR 70.2. 

Small tunnel kiln means a tunnel kiln (existing, new, or 

reconstructed) with a design capacity less than 9.07 Mg/hr (10 

tph) of fired product. 

Startup means the setting in operation of an affected 

source and starting the production process. 

Startup push rate means the kiln push rate required to 

bring the kiln to the proper operating temperature during 

startup. 

Tunnel kiln means any continuous kiln that is used to fire 

BSCP. Some tunnel kilns have two process streams, including a 

process stream that exhausts directly to the atmosphere or to an 

APCD, and a process stream in which the kiln exhaust is ducted 

to a sawdust dryer where it is used to dry sawdust before being 

emitted to the atmosphere. 

Tunnel kiln design capacity means the maximum amount of 

brick, in Mg (tons), that a kiln is designed to produce in one 

year divided by the number of hours in a year (8,760 hours), 

taking into account the void space in the brick, the push rate 

for the kiln, and the stacking pattern, if applicable. If a kiln 
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is modified to increase the capacity, the design capacity is 

considered to be the capacity following modifications. 

Wet scrubber (WS) means an APCD that uses water, which may 

include caustic additives or other chemicals, as the sorbent. 

Wet scrubbers may use any of various design mechanisms to 

increase the contact between exhaust gases and the sorbent. 

Work practice standard means any design, equipment, work 

practice, operational standard, or combination thereof, that is 

promulgated pursuant to section 112(h) of the Clean Air Act. 

Tables to Subpart JJJJJ of Part 63 

As stated in §63.8405, you must meet each emission limit in 

the following table that applies to you: 

Table 1 to Subpart JJJJJ of Part 63--Emission Limits 

For each... 

You must meet the 

following emission 

limits... 

Or you must comply 

with the 

following... 

1. Collection of all tunnel 

kilns at facility, 

including all process 

streams. 

HF, HCl, and Cl2

emissions must not 

exceed 26 kg/hr (57 

lb/hr) HCl equivalent, 

under the health-based 

standard, as determined 

using Equations 2 and 3. 

Not applicable. 

2. Existing large tunnel 

kiln (design capacity ≥10 

tons per hour (tph) of 

fired product), including 

all process streams. 

a. PM emissions must not 

exceed 0.018 kg/Mg 

(0.036 lb/ton) of fired 

product. 

i. PM emissions must 

not exceed 6.6 

mg/dscm (0.0029 

gr/dscf) at 17% O2; 

or 

 ii. Non-Hg HAP 

metals emissions 

must not exceed 

0.0026 kg/hr (0.0057 

lb/hr). 
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For each... 

You must meet the 

following emission 

limits... 

Or you must comply 

with the 

following... 

 b. Hg emissions must not 

exceed 2.0 E-05 kilogram 

per megagram (kg/Mg) 

(4.0 E-05 pound per ton 

(lb/ton)) of fired 

product. 

i. Hg emissions must 

not exceed 7.6 

micrograms per dry 

standard cubic meter 

(μg/dscm) at 17% O2; 

or 

 ii. Hg emissions 

must not exceed 2.5 

E-04 kg/hr (5.4 E-04 

lb/hr). 

3. Existing small tunnel 

kiln (design capacity <10 

tph of fired product), 

including all process 

streams 

a. PM emissions must not 

exceed 0.19 kg/Mg 

(0.37 lb/ton) of fired 

product. 

i. PM emissions must 

not exceed 4.8 

mg/dscm (0.0021 

gr/dscf) at 17% O2; 

or 

 ii. Non-Hg HAP 

metals emissions 

must not exceed 

0.047 kg/hr (0.11 

lb/hr). 

 b. Hg emissions must not 

exceed 1.7 E-04 kg/Mg 

(3.3 E-04 lb/ton) of 

fired product. 

i. Hg emissions must 

not exceed 88 

μg/dscm at 17% O2; 

or 

 ii. Hg emissions 

must not exceed 8.4 

E-04 kg/hr (0.0019 

lb/hr). 

4. New or reconstructed 

large tunnel kiln (design 

capacity ≥10 tph of fired 

product), including all 

process streams 

a. PM emissions must not 

exceed 0.016 kg/Mg 

(0.032 lb/ton) of fired 

product. 

i. PM emissions must 

not exceed 5.5 

mg/dscm (0.0024 

gr/dscf) at 17% O2; 

or 

 ii. Non-Hg HAP 

metals emissions 

must not exceed 

0.0026 kg/hr (0.0057 

lb/hr) of fired 

product. 

 b. Hg emissions must not 

exceed 1.4 E-05 kg/Mg 

(2.8 E-05 lb/ton) of 

fired product. 

i. Hg emissions must 

not exceed 6.1 

μg/dscm at 17% O2. 

 ii. Hg emissions 

must not exceed 1.6 

E-04 kg/hr (3.4 E-04 

lb/hr). 
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For each... 

You must meet the 

following emission 

limits... 

Or you must comply 

with the 

following... 

5. New or reconstructed 

small tunnel kiln (design 

capacity <10 tph of fired 

product), including all 

process streams. 

a. PM emissions must not 

exceed 0.016 kg/Mg 

(0.032 lb/ton) of fired 

product. 

i. PM emissions must 

not exceed 4.7 

mg/dscm (0.0021 

gr/dscf) at 17% O2; 

or 

 ii. Non-Hg HAP 

metals emissions 

must not exceed 

0.047 kg/hr (0.11 

lb/hr) of fired 

product. 

 b. Hg emissions must not 

exceed 1.7 E-04 kg/Mg 

(3.3 E-04 lb/ton) of 

fired product. 

i. Hg emissions must 

not exceed 88 

μg/dscm at 17% O2. 

 ii. Hg emissions 

must not exceed 8.4 

E-04 kg/hr (0.0019 

lb/hr). 

As stated in §63.8405, you must meet each operating limit 

in the following table that applies to you: 

Table 2 to Subpart JJJJJ of Part 63--Operating Limits 

For 

each... You must... 

1. Tunnel 

kiln 

equipped 

with a 

DLA. 

a. Maintain the average pressure drop across the DLA for each 

3-hour block period at or above the average pressure drop 

established during the HF/HCl/Cl2 performance test; or, if you 

are monitoring the bypass stack damper position, initiate 

corrective action within 1 hour after the bypass damper is 

opened allowing the kiln exhaust gas to bypass the DLA and 

complete corrective action in accordance with your OM&M plan; 

and 

 b. Maintain an adequate amount of limestone in the limestone 

hopper, storage bin (located at the top of the DLA), and DLA at 

all times; maintain the limestone feeder setting (on a per ton 

of fired product basis) at or above the level established 

during the HF/HCl/Cl2 performance test; and 

 c. Use the same grade of limestone from the same source as was 

used during the HF/HCl/Cl2 performance test; maintain records of 

the source and grade of limestone; and 

 d. Maintain no VE from the DLA stack. 
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For 

each... You must... 

2. Tunnel 

kiln 

equipped 

with a 

DIFF or 

DLS/FF. 

a. If you use a bag leak detection system, initiate corrective 

action within 1 hour of a bag leak detection system alarm and 

complete corrective actions in accordance with your OM&M plan; 

operate and maintain the fabric filter such that the alarm is 

not engaged for more than 5 percent of the total operating time 

in a 6-month block reporting period; or maintain no VE from the 

DIFF or DLS/FF stack; and 

 b. Maintain free-flowing lime in the feed hopper or silo and to 

the APCD at all times for continuous injection systems; 

maintain the feeder setting (on a per ton of fired product 

basis) at or above the level established during the HF/HCl/Cl2

performance test for continuous injection systems. 

3. Tunnel 

kiln 

equipped 

with a WS. 

a. Maintain the average scrubber pressure drop for each 3-hour 

block period at or above the average pressure drop established 

during the PM/non-Hg HAP metals performance test; and 

 b. Maintain the average scrubber liquid pH for each 3-hour 

block period at or above the average scrubber liquid pH 

established during the HF/HCl/Cl2 performance test; and 

 c. Maintain the average scrubber liquid flow rate for each 3-

hour block period at or above the highest average scrubber 

liquid flow rate established during the HF/HCl/Cl2 and PM/non-Hg 

HAP metals performance tests; and 

 d. If chemicals are added to the scrubber water, maintain the 

average scrubber chemical feed rate for each 3-hour block 

period at or above the average scrubber chemical feed rate 

established during the HF/HCl/Cl2 performance test. 

4. Tunnel 

kiln 

equipped 

with an 

ACI 

system. 

Maintain the average carbon flow rate for each 3-hour block 

period at or above the average carbon flow rate established 

during the Hg performance test. 

5. Tunnel 

kiln with 

no add-on 

control. 

a. Maintain no VE from the stack. 

 b. Maintain the kiln process rate at or below the kiln process 

rate determined according to §63.8445(g)(1). 

As stated in §63.8405, you must meet each work practice 

standard in the following table that applies to you: 

Table 3 to Subpart JJJJJ of Part 63--Work Practice Standards 
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For each... You must... According to the following requirements... 

1. Existing, new 

or reconstructed 

periodic kiln 

a. Minimize 

HAP 

emissions. 

i. Develop and use a designed firing time 

and temperature cycle for each periodic 

kiln. You must either program the time and 

temperature cycle into your kiln or track 

each step on a log sheet; and 

 ii. Label each periodic kiln with the 

maximum load (in tons) of product that can 

be fired in the kiln during a single firing 

cycle; and 

 iii. For each firing load, document the 

total tonnage of product placed in the kiln 

to ensure that it is not greater than the 

maximum load identified in item 1b; and 

 iv. Develop and follow maintenance 

procedures for each kiln that, at a 

minimum, specify the frequency of 

inspection and maintenance of temperature 

monitoring devices, controls that regulate 

air-to-fuel ratios, and controls that 

regulate firing cycles; and 

 v. Develop and maintain records for each 

periodic kiln, as specified in §63.8490. 

2. Existing, new 

or reconstructed 

tunnel kiln 

a. Minimize 

dioxin/furan 

emissions. 

i. Maintain and inspect the burners and 

associated combustion controls (as 

applicable); and 

 ii. Tune the specific burner type to 

optimize combustion. 

3. Existing, new 

or reconstructed 

tunnel kiln 

during periods of 

startup 

a. Minimize 

HAP 

emissions. 

i. Establish the startup push rate for each 

kiln, the minimum APCD inlet temperature 

for each APCD, and temperature profile for 

each kiln without an APCD and include them 

in your first compliance report, as 

specified in §63.8485(c)(8); and 

 ii. After initial charging of the kiln with 

loaded kiln cars, remain at or below the 

startup push rate for the kiln until the 

kiln exhaust reaches the minimum APCD inlet 

temperature for a kiln with an APCD or 

until the kiln temperature profile is 

attained for a kiln with no APCD; and 

 iii. If your kiln has an APCD, begin 

venting the exhaust from the kiln through 

the APCD by the time the kiln exhaust 

temperature reaches the minimum APCD inlet 

temperature. 
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For each... You must... According to the following requirements... 

4. Existing, new 

or reconstructed 

tunnel kiln 

during periods of 

shutdown 

a. Minimize 

HAP 

emissions. 

i. Do not push loaded kiln cars into the 

kiln once the kiln exhaust temperature 

falls below the minimum APCD inlet 

temperature if the kiln is controlled by an 

APCD or when the kiln temperature profile 

is no longer maintained for an uncontrolled 

kiln; and 

 ii. If your kiln has an APCD, continue to 

vent the exhaust from the kiln through the 

APCD until the kiln exhaust temperature 

falls below the minimum inlet temperature 

for the APCD. 

5. Existing, new 

or reconstructed 

tunnel kiln 

during periods of 

routine control 

device 

maintenance 

a. Minimize 

HAP 

emissions. 

i. Develop and use a temperature profile 

for each kiln; and 

 ii. Develop and follow maintenance 

procedures for each kiln that, at a 

minimum, specify the frequency of 

inspection and maintenance of temperature 

monitoring devices and controls that 

regulate air-to-fuel ratios; and 

 iii. Develop and maintain records for each 

kiln, as specified in §63.8490(a)(3). 

As stated in §63.8445, you must conduct each performance 

test in the following table that applies to you: 

Table 4 to Subpart JJJJJ of Part 63--Requirements for 

Performance Tests 

For each... You must... Using... 

According to the 

following 

requirements... 

1. Tunnel 

kiln. 

a. Select 

locations of 

sampling ports 

and the number 

of traverse 

points. 

Method 1 or 1A 

of 40 CFR part 

60, appendix A1. 

Sampling sites must be 

located at the outlet 

of the APCD and prior 

to any releases to the 

atmosphere for all 

affected sources. 
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For each... You must... Using... 

According to the 

following 

requirements... 

 b. Determine 

velocities and 

volumetric flow 

rate. 

Method 2 of 40 

CFR part 60, 

appendix A-1. 

You may use Method 2A, 

2C, 2D, or 2F of 40 CFR 

part 60, appendix A-1, 

or Method 2G of 40 CFR 

part 60, appendix A-2, 

as appropriate, as an 

alternative to using 

Method 2 of 40 CFR part 

60, appendix A-1. 

 c. Conduct gas 

molecular weight 

analysis. 

Method 3 of 40 

CFR part 60, 

appendix A-2. 

You may use Method 3A 

or 3B of 40 CFR part 

60, appendix A-2, as 

appropriate, as an 

alternative to using 

Method 3 of 40 CFR part 

60, appendix A-2. 

ANSI/ASME PTC 19.10-

1981 [Part 10] 

(incorporated by 

reference, see §63.14) 

may be used as an 

alternative to the 

manual procedures (but 

not the instrumental 

procedures) in Methods 

3A and 3B. 

 d. Measure 

moisture content 

of the stack 

gas. 

Method 4 of 40 

CFR part 60, 

appendix A-3. 

 e. Measure HF, 

HCl and Cl2

emissions. 

i. Method 26A of 

40 CFR part 60, 

appendix A-8; or 

You may use Method 26 

of 40 CFR part 60, 

appendix A-8, as an 

alternative to using 

Method 26A of 40 CFR 

part 60, appendix A-8, 

when no acid PM (e.g., 

HF or HCl dissolved in 

water droplets emitted 

by sources controlled 

by a WS) is present. 

ASTM D6735-01 

(Reapproved 2009) 

(incorporated by 

reference, see §63.14) 

may be used as an 

alternative to Methods 

26 and 26A. 
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For each... You must... Using... 

According to the 

following 

requirements... 

 ii. Method 320 

of appendix A of 

this part. 

When using Method 320 

of appendix A of this 

part, you must follow 

the analyte spiking 

procedures of section 

13 of Method 320 of 

appendix A of this 

part, unless you can 

demonstrate that the 

complete spiking 

procedure has been 

conducted at a similar 

source. ASTM D6348-03 

(Reapproved 2010) 

(incorporated by 

reference, see §63.14) 

may be used as an 

alternative to Method 

320 if the test plan 

preparation and 

implementation in 

Annexes A1-A8 are 

mandatory and the %R in 

Annex A5 is determined 

for each target 

analyte. 

 f. Measure PM 

emissions or 

non-Hg HAP 

metals. 

i. For PM only: 

Method 5 of 40 

CFR part 60, 

appendix A-3; or 

 ii. For PM or 

non-Hg HAP 

metals: Method 

29 of 40 CFR 

part 60, 

appendix A-8. 

 g. Measure Hg 

emissions. 

Method 29 of 40 

CFR part 60, 

appendix A-8. 

ASTM D6784-02 

(Reapproved 2008) 

(incorporated by 

reference, see §63.14) 

may be used as an 

alternative to Method 

29 (portion for Hg 

only). 
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For each... You must... Using... 

According to the 

following 

requirements... 

2. Tunnel kiln 

with no add-on 

control. 

Establish the 

operating 

limit(s) for 

kiln process 

rate if the 

total facility 

maximum 

potential HClequivalent 

emissions are 

greater than the 

HCl-equivalent 

limit in Table 1 

to this subpart.

HCl-equivalent 

limit in Table 1 

to this subpart 

and emissions 

and production 

data from the 

HF/HCl/Cl2

performance 

test. 

Using the procedures in 

§63.8445(g)(1), you 

must determine the 

maximum process rate(s) 

for your kiln(s) that 

would ensure total 

facility maximum 

potential HClequivalent emissions 

remain at or below the 

HCl-equivalent limit in 

Table 1 to this 

subpart. The maximum 

process rate(s) would 

become your sitespecific process rate 

operating limit(s). 

3. Tunnel kiln 

that is 

complying with 

PM and/or Hg 

productionbased emission 

limits. 

Determine the 

production rate 

during each 

PM/Hg test run 

in order to 

determine 

compliance with 

PM and/or Hg 

production-based 

emission limits.

Production data 

collected during 

the PM/Hg 

performance 

tests (e.g., no. 

of pushes per 

hour, no. of 

bricks per kiln 

car, weight of a 

typical fired 

brick). 

You must measure and 

record the production 

rate, on a firedproduct basis, of the 

affected source for 

each of the three test 

runs. 

4. Tunnel kiln 

equipped with 

a DLA. 

a. Establish the 

operating limit 

for the average 

pressure drop 

across the DLA. 

Data from the 

pressure drop 

measurement 

device during 

the HF/HCl/Cl2

performance 

test. 

You must continuously 

measure the pressure 

drop across the DLA, 

determine and record 

the block average 

pressure drop values 

for the three test 

runs, and determine and 

record the 3-hour block 

average of the recorded 

pressure drop 

measurements for the 

three test runs. The 

average of the three 

test runs establishes 

your minimum sitespecific pressure drop 

operating limit. 
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For each... You must... Using... 

According to the 

following 

requirements... 

 b. Establish the 

operating limit 

for the 

limestone feeder 

setting. 

Data from the 

limestone feeder 

during the 

HF/HCl/Cl2

performance 

test. 

You must ensure that 

you maintain an 

adequate amount of 

limestone in the 

limestone hopper, 

storage bin (located at 

the top of the DLA), 

and DLA at all times 

during the performance 

test. You must 

establish your 

limestone feeder 

setting, on a per ton 

of fired product basis, 

one week prior to the 

performance test and 

maintain the feeder 

setting for the oneweek period that 

precedes the 

performance test and 

during the performance 

test. 

 c. Document the 

source and grade 

of limestone 

used. 

Records of 

limestone 

purchase. 
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For each... You must... Using... 

According to the 

following 

requirements... 

5. Tunnel kiln 

equipped with 

a DIFF or 

DLS/FF. 

Establish the 

operating limit 

for the lime 

feeder setting. 

Data from the 

lime feeder 

during the 

HF/HCl/Cl2

performance 

test. 

For continuous lime 

injection systems, you 

must ensure that lime 

in the feed hopper or 

silo and to the APCD is 

free-flowing at all 

times during the 

performance test and 

record the feeder 

setting, on a per ton 

of fired product basis, 

for the three test 

runs. If the feed rate 

setting varies during 

the three test runs, 

determine and record 

the average feed rate 

from the three test 

runs. The average of 

the three test runs 

establishes your 

minimum site-specific 

feed rate operating 

limit. 

6. Tunnel kiln 

equipped with 

a WS. 

a. Establish the 

operating limit 

for the average 

scrubber 

pressure drop. 

Data from the 

pressure drop 

measurement 

device during 

the PM/non-Hg 

HAP metals 

performance 

test. 

You must continuously 

measure the scrubber 

pressure drop, 

determine and record 

the block average 

pressure drop values 

for the three test 

runs, and determine and 

record the 3-hour block 

average of the recorded 

pressure drop 

measurements for the 

three test runs. The 

average of the three 

test runs establishes 

your minimum sitespecific pressure drop 

operating limit. 
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For each... You must... Using... 

According to the 

following 

requirements... 

 b. Establish the 

operating limit 

for the average 

scrubber liquid 

pH. 

Data from the pH 

measurement 

device during 

the performance 

HF/HCl/Cl2

performance 

test. 

You must continuously 

measure the scrubber 

liquid pH, determine 

and record the block 

average pH values for 

the three test runs, 

and determine and 

record the 3-hour block 

average of the recorded 

pH measurements for the 

three test runs. The 

average of the three 

test runs establishes 

your minimum sitespecific liquid pH 

operating limit. 

 c. Establish the 

operating limit 

for the average 

scrubber liquid 

flow rate. 

Data from the 

flow rate 

measurement 

device during 

the HF/HCl/Cl2

and PM/non-Hg 

HAP metals 

performance 

tests. 

You must continuously 

measure the scrubber 

liquid flow rate, 

determine and record 

the block average flow 

rate values for the 

three test runs, and 

determine and record 

the 3-hour block 

average of the recorded 

flow rate measurements 

for the three test 

runs. The average of 

the three test runs 

establishes your 

minimum site-specific 

liquid flow rate 

operating level. If 

different average wet 

scrubber liquid flow 

rate values are 

measured during the 

HF/HCl/Cl2 and PM/nonHg HAP metals tests, 

the highest of the 

average values become 

your site-specific 

operating limit. 
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For each... You must... Using... 

According to the 

following 

requirements... 

7. Tunnel kiln 

equipped with 

a WS that 

includes 

chemical 

addition to 

the water. 

Establish the 

operating limit 

for the average 

scrubber 

chemical feed 

rate. 

Data from the 

chemical feed 

rate measurement 

device during 

the HF/HCl/Cl2

performance 

test. 

You must continuously 

measure the scrubber 

chemical feed rate, 

determine and record 

the block average 

chemical feed rate 

values for the three 

test runs, and 

determine and record 

the 3-hour block 

average of the recorded 

chemical feed rate 

measurements for the 

three test runs. The 

average of the three 

test runs establishes 

your minimum sitespecific chemical 

addition rate operating 

limit. 

8. Tunnel kiln 

equipped with 

an ACI system 

Establish the 

operating limit 

for the average 

carbon flow 

rate. 

Data from the 

carbon flow rate 

measurement 

conducted during 

the Hg 

performance 

test. 

You must measure the 

carbon flow rate during 

each test run, 

determine and record 

the block average 

carbon flow rate values 

for the three test 

runs, and determine and 

record the 3-hour block 

average of the recorded 

carbon flow rate 

measurements for the 

three test runs. The 

average of the three 

test runs establishes 

your minimum sitespecific activated 

carbon flow rate 

operating limit. 

As stated in §63.8455, you must demonstrate initial 

compliance with each emission limitation and work practice 

standard that applies to you according to the following table: 

Table 5 to Subpart JJJJJ of Part 63--Initial Compliance with 

Emission Limitations and Work Practice Standards 
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For each... 

For the 

following... 

You have demonstrated initial 

compliance if... 

1. Collection of 

all tunnel kilns 

at the facility, 

including all 

process streams. 

a. HF, HCl, and Cl2

emissions must not 

exceed 26 kg/hr (57 

lb/hr) HCl 

equivalent. 

i. You measure HF, HCl, and Cl2

emissions for each kiln using 

Method 26 or 26A of 40 CFR part 60, 

appendix A-8 or its alternative, 

ASTM D6735-01 (Reapproved 2009) 

(incorporated by reference, see 

§63.14); or Method 320 of appendix 

A of this part or its alternative, 

ASTM D6348-03 (Reapproved 2010) 

(incorporated by reference, see 

§63.14); and 

 ii. You calculate the HClequivalent emissions for each kiln 

using Equation 2 to this subpart; 

and 

 iii. You sum the HCl-equivalent 

values for all kilns at the 

facility using Equation 3 to this 

subpart; and 

 iv. The facility total HClequivalent does not exceed 26 kg/hr 

(57 lb/hr). 

2. Existing large 

tunnel kiln 

(design capacity 

≥10 tph of fired 

product), 

including all 

process streams. 

a. PM emissions 

must not exceed 

0.018 kg/Mg 

(0.036 lb/ton) of 

fired product or 

6.6 mg/dscm (0.0029 

gr/dscf) at 17% O2; 

or 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, 

appendix A-3 or Method 29 of 40 CFR 

part 60, appendix A-8, over the 

period of the initial performance 

test, according to the calculations 

in §63.8445(f)(1), do not exceed 

0.018 kg/Mg (0.036 lb/ton) of fired 

product or 6.6 mg/dscm (0.0029 

gr/dscf) at 17% O2; and 

 ii. You establish and have a record 

of the applicable operating limits 

listed in Table 2 to this subpart 

over the 3-hour performance test 

during which PM emissions did not 

exceed 0.018 kg/Mg (0.036 lb/ton) 

of fired product or 6.6 mg/dscm 

(0.0029 gr/dscf) at 17% O2. 

b. Non-Hg HAP 

metals emissions 

must not exceed 

0.0026 kg/hr 

(0.0057 lb/hr). 

i. The non-Hg HAP metals emissions 

measured using Method 29 of 40 CFR 

part 60, appendix A-8, over the 

period of the initial performance 

test, do not exceed 0.0026 kg/hr 

(0.0057 lb/hr); and 
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For each... 

For the 

following... 

You have demonstrated initial 

compliance if... 

 ii. You establish and have a record 

of the applicable operating limits 

listed in Table 2 to this subpart 

over the 3-hour performance test 

during which non-Hg HAP metals 

emissions did not exceed 0.0026 

kg/hr (0.0057 lb/hr). 

 c. Hg emissions 

must not exceed 2.0 

E-05 kg/Mg (4.0 E05 lb/ton) of fired 

product or 7.6 

μg/dscm at 17% O2

or 2.5 E-04 kg/hr 

(5.4 E-04 lb/hr). 

i. The Hg emissions measured using 

Method 29 of 40 CFR part 60, 

appendix A-8 or its alternative, 

ASTM D6784-02 (Reapproved 2008) 

(incorporated by reference, see 

§63.14), over the period of the 

initial performance test, do not 

exceed 2.0 E-05 kg/Mg (4.0 E-05 

lb/ton) of fired product or 7.6 

μg/dscm at 17% O2 or 2.5 E-04 kg/hr 

(5.4 E-04 lb/hr); and 

 ii. You establish and have a record 

of the applicable operating limits 

listed in Table 2 to this subpart 

over the 3-hour performance test 

during which Hg emissions did not 

exceed 2.0 E-05 kg/Mg (4.0 E-05 

lb/ton) of fired product or 7.6 

μg/dscm at 17% O2 or 2.5 E-04 kg/hr 

(5.4 E-04 lb/hr). 

3. Existing small 

tunnel kiln 

(design capacity 

<10 tph of fired 

product), 

including all 

process streams. 

a. PM emissions 

must not exceed 

0.19 kg/Mg 

(0.37 lb/ton) of 

fired product or 

4.8 mg/dscm (0.0021

gr/dscf) at 17% O2; 

or 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, 

appendix A-3 or Method 29 of 40 CFR 

part 60, appendix A-8, over the 

period of the initial performance 

test, according to the calculations 

in §63.8445(f)(1), do not exceed 

0.19 kg/Mg (0.37 lb/ton) of fired 

product or 4.5 mg/dscm (0.0021 

gr/dscf) at 17% O2; and 

 ii. You establish and have a record 

of the applicable operating limits 

listed in Table 2 to this subpart 

over the 3-hour performance test 

during which PM emissions did not 

exceed 0.19 kg/Mg (0.37 lb/ton) of 

fired product or 4.5 mg/dscm 

(0.0021 gr/dscf) at 17% O2. 
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For each... 

For the 

following... 

You have demonstrated initial 

compliance if... 

 b. Non-Hg HAP 

metals emissions 

must not exceed 

0.047 kg/hr (0.11 

lb/hr). 

i. The non-Hg HAP metals emissions 

measured using Method 29 of 40 CFR 

part 60, appendix A-8, over the 

period of the initial performance 

test, do not exceed 0.047 kg/hr 

(0.11 lb/hr); and 

 ii. You establish and have a record 

of the applicable operating limits 

listed in Table 2 to this subpart 

over the 3-hour performance test 

during which non-Hg HAP metals 

emissions did not exceed 0.047 

kg/hr (0.11 lb/hr). 

 c. Hg emissions 

must not exceed 1.7

E-04 kg/Mg (3.3 E04 lb/ton) of fired 

product or 88 

μg/dscm at 17% O2

or 8.4 E-04 kg/hr 

(0.0019 lb/hr). 

i. The Hg emissions measured using 

Method 29 of 40 CFR part 60, 

appendix A-8 or its alternative, 

ASTM D6784-02 (Reapproved 2008) 

(incorporated by reference, see 

§63.14), over the period of the 

initial performance test, do not 

exceed 1.7 E-04 kg/Mg (3.3 E-04 

lb/ton) of fired product or 88 

μg/dscm at 17% O2 or 8.4 E-04 kg/hr 

(0.0019 lb/hr); and 

 ii. You establish and have a record 

of the applicable operating limits 

listed in Table 2 to this subpart 

over the 3-hour performance test 

during which Hg emissions did not 

exceed 1.7 E-04 kg/Mg (3.3 E-04 

lb/ton) of fired product or 88 

μg/dscm at 17% O2 or 8.4 E-04 kg/hr 

(0.0019 lb/hr). 

4. New or 

reconstructed 

large tunnel kiln 

(design capacity 

≥10 tph of fired 

product), 

including all 

process streams. 

a. PM emissions 

must not exceed 

0.016 kg/Mg 

(0.032 lb/ton) of 

fired product or 

5.5 mg/dscm (0.0024 

gr/dscf) at 17% O2; 

or 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, 

appendix A-3, over the period of 

the initial performance test, 

according to the calculations in 

§63.8445(f)(1), do not exceed 

0.016 kg/Mg (0.032 lb/ton) of fired 

product or 5.5 mg/dscm (0.0024 

gr/dscf) at 17% O2; and 

 ii. You establish and have a record 

of the applicable operating limits 

listed in Table 2 to this subpart 

over the 3-hour performance test 

during which PM emissions did not 

exceed 0.016 kg/Mg (0.032 lb/ton) 

of fired product or 5.5 mg/dscm 

(0.0024 gr/dscf) at 17% O2. 
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For each... 

For the 

following... 

You have demonstrated initial 

compliance if... 

b. Non-Hg HAP 

metals emissions 

must not exceed 

0.0026 kg/hr 

(0.0057 lb/hr). 

i. The non-Hg HAP metals emissions 

measured using Method 29 of 40 CFR 

part 60, appendix A-8, over the 

period of the initial performance 

test, do not exceed 0.0026 kg/hr 

(0.0057 lb/hr); and 

 ii. You establish and have a record 

of the applicable operating limits 

listed in Table 2 to this subpart 

over the 3-hour performance test 

during which non-Hg HAP metals 

emissions did not exceed 0.0026 

kg/hr (0.0057 lb/hr). 

 c. Hg emissions 

must not exceed 1.4 

E-05 kg/Mg (2.8 E05 lb/ton) of fired 

product or 6.1 

μg/dscm at 17% O2

or 1.6 E-04 kg/hr 

(3.4 E-04 lb/hr). 

i. The Hg emissions measured using 

Method 29 of 40 CFR part 60, 

appendix A-8 or its alternative, 

ASTM D6784-02 (Reapproved 2008) 

(incorporated by reference, see 

§63.14), over the period of the 

initial performance test, do not 

exceed 1.4 E-05 kg/Mg (2.8 E-05 

lb/ton) of fired product or 6.1 

μg/dscm at 17% O2 or 1.6 E-04 kg/hr 

(3.4 E-04 lb/hr); and 

 ii. You establish and have a record 

of the applicable operating limits 

listed in Table 2 to this subpart 

over the 3-hour performance test 

during which Hg emissions did not 

exceed 1.4 E-05 kg/Mg (2.8 E-05 

lb/ton) of fired product or 6.1 

μg/dscm at 17% O2 or 1.6 E-04 kg/hr 

(3.4 E-04 lb/hr). 

5. New or 

reconstructed 

small tunnel kiln 

(design capacity 

<10 tph of fired 

product), 

including all 

process streams. 

a. PM emissions 

must not exceed 

0.016 kg/Mg 

(0.032 lb/ton) of 

fired product or 

4.7 mg/dscm (0.0021

gr/dscf) at 17% O2; 

or 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, 

appendix A-3, over the period of 

the initial performance test, 

according to the calculations in 

§63.8445(f)(1), do not exceed 

0.016 kg/Mg (0.032 lb/ton) of fired 

product or 4.7 mg/dscm (0.0021 

gr/dscf) at 17% O2; and 

 ii. You establish and have a record 

of the applicable operating limits 

listed in Table 2 to this subpart 

over the 3-hour performance test 

during which PM emissions did not 

exceed 0.016 kg/Mg (0.032 lb/ton) 

of fired product or 4.7 mg/dscm 

(0.0021 gr/dscf) at 17% O2. 
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For each... 

For the 

following... 

You have demonstrated initial 

compliance if... 

 b. Non-Hg HAP 

metals emissions 

must not exceed 

0.047 kg/hr (0.11 

lb/hr). 

i. The non-Hg HAP metals emissions 

measured using Method 29 of 40 CFR 

part 60, appendix A-8, over the 

period of the initial performance 

test, do not exceed 0.047 kg/hr 

(0.11 lb/hr); and 

 ii. You establish and have a record 

of the applicable operating limits 

listed in Table 2 to this subpart 

over the 3-hour performance test 

during which non-Hg HAP metals 

emissions did not exceed 0.047 

kg/hr (0.11 lb/hr). 

 c. Hg emissions 

must not exceed 1.7

E-04 kg/Mg (3.3 E04 lb/ton) of fired 

product or 88 

μg/dscm at 17% O2

or 8.4 E-04 kg/hr 

(0.0019 lb/hr). 

i. The Hg emissions measured using 

Method 29 of 40 CFR part 60, 

appendix A-8 or its alternative, 

ASTM D6784-02 (Reapproved 2008) 

(incorporated by reference, see 

§63.14), over the period of the 

initial performance test, do not 

exceed 1.7 E-04 kg/Mg (3.3 E-04 

lb/ton) of fired product or 88 

μg/dscm at 17% O2 or 8.4 E-04 kg/hr 

(0.0019 lb/hr); and 

 ii. You establish and have a record 

of the applicable operating limits 

listed in Table 2 to this subpart 

over the 3-hour performance test 

during which Hg emissions did not 

exceed 1.7 E-04 kg/Mg (3.3 E-04 

lb/ton) of fired product or 88 

μg/dscm at 17% O2 or 8.4 E-04 kg/hr 

(0.0019 lb/hr). 

6. Existing, new 

or reconstructed 

periodic kiln. 

a. Minimize HAP 

emissions. 

i. Develop a designed firing time 

and temperature cycle for each 

periodic kiln. You must either 

program the time and temperature 

cycle into your kiln or track each 

step on a log sheet; and 

 ii. Label each periodic kiln with 

the maximum load (in tons) of 

product that can be fired in the 

kiln during a single firing cycle; 

and 
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For each... 

For the 

following... 

You have demonstrated initial 

compliance if... 

 iii. Develop maintenance procedures 

for each kiln that, at a minimum, 

specify the frequency of inspection 

and maintenance of temperature 

monitoring devices, controls that 

regulate air-to-fuel ratios, and 

controls that regulate firing 

cycles. 

7. Existing, new 

or reconstructed 

tunnel kiln. 

a. Minimize 

dioxin/furan 

emissions. 

i. Conduct initial inspection of 

the burners and associated 

combustion controls (as 

applicable); and 

 ii. Tune the specific burner type 

to optimize combustion. 

As stated in §63.8470, you must demonstrate continuous 

compliance with each emission limitation and work practice 

standard that applies to you according to the following table: 

Table 6 to Subpart JJJJJ of Part 63--Continuous Compliance with 

Emission Limitations and Work Practice Standards 

For 

each... 

For the 

following... 

You must demonstrate continuous compliance 

by... 

1. Tunnel 

kiln 

equipped 

with a 

DLA. 

a. Each 

emission limit 

in Table 1 to 

this subpart 

and each 

operating limit 

in Item 1 of 

Table 2 to this 

subpart for 

tunnel kilns 

equipped with a 

DLA. 

i. Collecting the DLA pressure drop data 

according to §63.8450(a); reducing the DLA 

pressure drop data to 3-hour block averages 

according to §63.8450(a); maintaining the 

average pressure drop across the DLA for each 

3-hour block period at or above the average 

pressure drop established during the HF/HCl/Cl2

performance test; or continuously monitoring 

the bypass stack damper position at least once 

every 15 minutes during normal kiln operation, 

and initiating corrective action within 1 hour 

after the bypass damper is opened allowing the 

kiln exhaust gas to bypass the DLA and 

completing corrective action in accordance 

with your OM&M plan; and 
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For 

each... 

For the 

following... 

You must demonstrate continuous compliance 

by... 

 ii. Verifying that the limestone hopper and 

storage bin (located at the top of the DLA) 

contain adequate limestone by performing a 

daily visual check, which could include one of 

the following: (1) conducting a physical check 

of the hopper; (2) creating a visual access 

point, such as a window, on the side of the 

hopper; (3) installing a camera in the hopper 

that provides continuous feed to a video 

monitor in the control room; or (4) confirming 

that load level indicators in the hopper are 

not indicating the need for additional 

limestone; and 

 iii. Recording the limestone feeder setting 

daily (on a per ton of fired product basis) to 

verify that the feeder setting is being 

maintained at or above the level established 

during the HF/HCl/Cl2 performance test; and 

 iv. Using the same grade of limestone from the 

same source as was used during the HF/HCl/Cl2

performance test; maintaining records of the 

source and type of limestone; and 

 v. Performing VE observations of the DLA stack 

at the frequency specified in §63.8470(e) 

using Method 22 of 40 CFR part 60, appendix A7; maintaining no VE from the DLA stack. 

2. Tunnel 

kiln 

equipped 

with a 

DIFF or 

DLS/FF. 

a. Each 

emission limit 

in Table 1 to 

this subpart 

and each 

operating limit 

in Item 2 of 

Table 2 to this 

subpart for 

tunnel kilns 

equipped with 

DIFF or DLS/FF. 

i. If you use a bag leak detection system, as 

prescribed in 63.8450(e), initiating 

corrective action within 1 hour of a bag leak 

detection system alarm and completing 

corrective actions in accordance with your 

OM&M plan; operating and maintaining the 

fabric filter such that the alarm is not 

engaged for more than 5 percent of the total 

operating time in a 6-month block reporting 

period; in calculating this operating time 

fraction, if inspection of the fabric filter 

demonstrates that no corrective action is 

required, no alarm time is counted; if 

corrective action is required, each alarm is 

counted as a minimum of 1 hour; if you take 

longer than 1 hour to initiate corrective 

action, the alarm time is counted as the 

actual amount of time taken by you to initiate 

corrective action; or performing VE 

observations of the DIFF or DLS/FF stack at 

the frequency specified in §63.8470(e) using 

Method 22 of 40 CFR part 60, appendix A-7; and 

maintaining no VE from the DIFF or DLS/FF 

stack; and 
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For 

each... 

For the 

following... 

You must demonstrate continuous compliance 

by... 

ii. Verifying that lime is free-flowing via a 

load cell, carrier gas/lime flow indicator, 

carrier gas pressure drop measurement system, 

or other system; recording all monitor or 

sensor output, and if lime is found not to be 

free flowing, promptly initiating and 

completing corrective actions in accordance 

with your OM&M plan; recording the feeder 

setting once during each shift of operation to 

verify that the feeder setting is being 

maintained at or above the level established 

during the HF/HCl/Cl2 performance test.

3. Tunnel 

kiln 

equipped 

with a WS. 

a. Each 

emission limit 

in Table 1 to 

this subpart 

and each 

operating limit 

in Item 3 of 

Table 2 to this 

subpart for 

tunnel kilns 

equipped with 

WS. 

i. Collecting the scrubber pressure drop data 

according to §63.8450(a); reducing the 

scrubber pressure drop data to 3-hour block 

averages according to §63.8450(a); maintaining 

the average scrubber pressure drop for each 3-

hour block period at or above the average 

pressure drop established during the PM/non-Hg 

HAP metals performance test; and 

 ii. Collecting the scrubber liquid pH data 

according to §63.8450(a); reducing the 

scrubber liquid pH data to 3-hour block 

averages according to §63.8450(a); maintaining 

the average scrubber liquid pH for each 3-hour 

block period at or above the average scrubber 

liquid pH established during the HF/HCl/Cl2

performance test; and 

 iii. Collecting the scrubber liquid flow rate 

data according to §63.8450(a); reducing the 

scrubber liquid flow rate data to 3-hour block 

averages according to §63.8450(a); maintaining 

the average scrubber liquid flow rate for each 

3-hour block period at or above the highest 

average scrubber liquid flow rate established 

during the HF/HCl/Cl2 and PM/non-Hg HAP metals 

performance tests; and 
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For 

each... 

For the 

following... 

You must demonstrate continuous compliance 

by... 

 iv. If chemicals are added to the scrubber 

water, collecting the scrubber chemical feed 

rate data according to §63.8450(a); reducing 

the scrubber chemical feed rate data to 3-hour 

block averages according to §63.8450(a); 

maintaining the average scrubber chemical feed 

rate for each 3-hour block period at or above 

the average scrubber chemical feed rate 

established during the HF/HCl/Cl2 performance 

test. 

4. Tunnel 

kiln 

equipped 

with an 

ACI 

system. 

Each emission 

limit in Table 

1 to this 

subpart and 

each operating 

limit in Item 4 

of Table 2 to 

this subpart 

for tunnel 

kilns equipped 

with ACI 

system. 

Collecting the carbon flow rate data according 

to §63.8450(a); reducing the carbon flow rate 

data to 3-hour block averages according to 

§63.8450(a); maintaining the average carbon 

flow rate for each 3-hour block period at or 

above the average carbon flow rate established 

during the Hg performance test. 

5. Tunnel 

kiln with 

no add-on 

control 

a. Each 

emission limit 

in Table 1 to 

this subpart 

and each 

operating limit 

in Item 5 of 

Table 2 to this 

subpart for 

tunnel kilns 

with no add-on 

control. 

i. Performing VE observations of the stack at 

the frequency specified in §63.8470(e) using 

Method 22 of 40 CFR part 60, appendix A-7; and 

maintaining no VE from the stack. 

 ii. If your last calculated total facility 

maximum potential HCl-equivalent was not at or 

below the health-based standard in Table 1 to 

this subpart, collecting the kiln process rate 

data according to §63.8450(a); reducing the 

kiln process rate data to 3-hour block 

averages according to §63.8450(a); maintaining 

the average kiln process rate for each 3-hour 

block period at or below the kiln process rate 

determined according to §63.8445(g)(1). 

6. 

Periodic 

kiln 

a. Minimize HAP 

emissions. 

i. Using a designed firing time and 

temperature cycle for each periodic kiln; and 
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For 

each... 

For the 

following... 

You must demonstrate continuous compliance 

by... 

 ii. For each firing load, documenting the 

total tonnage of product placed in the kiln to 

ensure that it is not greater than the maximum 

load identified in Item 1.a.ii of Table 3 to 

this subpart; and 

 iii. Following maintenance procedures for each 

kiln that, at a minimum, specify the frequency 

of inspection and maintenance of temperature 

monitoring devices, controls that regulate 

air-to-fuel ratios, and controls that regulate 

firing cycles; and 

 iv. Developing and maintaining records for 

each periodic kiln, as specified in §63.8490. 

7. Tunnel 

kiln 

a. Minimize 

dioxin/furan 

emissions 

i. Maintaining and inspecting the burners and 

associated combustion controls (as applicable) 

and tuning the specific burner type to 

optimize combustion no later than 36 calendar 

months after the previous tune-up; and 

 ii. Maintaining records of burner tune-ups 

used to demonstrate compliance with the 

dioxin/furan work practice standard; and 

 iii. Submitting a report of most recent tuneup conducted with compliance report. 

As stated in §63.8395, you must meet each compliance date 

in the following table that applies to you: 

Table 7 to Subpart JJJJJ of Part 63--Compliance Dates 

If you have a(n)... Then you must... No later than... 

1. New or reconstructed 

affected source and the initial 

startup of your affected source 

is after December 18, 2014, but 

before [insert date 60 days 

from date of publication]

Comply with the 

applicable emission 

limitations and work 

practice standards in 

Tables 1, 2, and 3 to 

this subpart 

[Insert date 60 

days from date 

of publication].

2. New or reconstructed 

affected source and the initial 

startup of your affected source 

is after [insert date 60 days 

from date of publication]

Comply with the 

applicable emission 

limitations and work 

practice standards in 

Tables 1, 2, and 3 to 

this subpart 

Initial startup 

of your affected 

source. 
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If you have a(n)... Then you must... No later than... 

3. Existing affected source Comply with the 

applicable emission 

limitations and work 

practice standards in 

Tables 1, 2, and 3 to 

this subpart 

[Insert date 3 

years and 60 

days from date 

of publication].

4. Existing area source that 

increases its emissions or its 

potential to emit such that it 

becomes a major source of HAP 

by adding a new affected source 

or by reconstructing 

Be in compliance with 

this subpart 

Initial startup 

of your affected 

source as a 

major source.

5. New area source (i.e., an 

area source for which 

construction or reconstruction 

commenced after December 18, 

2014) that increases its 

emissions or its potential to 

emit such that it becomes a 

major source of HAP 

Be in compliance with 

this subpart 

Initial startup 

of your affected 

source as a 

major source.

As stated in §63.8480, you must submit each notification 

that applies to you according to the following table: 

Table 8 to Subpart JJJJJ of Part 63--Deadlines for Submitting 

Notifications 

If you... You must... No later than... 

As specified 

in... 

1. Start up your 

affected source before 

[insert date 60 days 

from date of 

publication]

Submit an 

Initial 

Notification 

[Insert date 240 

days from date of 

publication]

§63.9(b)(2). 

2. Start up your new or 

reconstructed affected 

source on or after 

[insert date 60 days 

from date of 

publication]

Submit an 

Initial 

Notification 

120 calendar days 

after you become 

subject to this 

subpart 

§63.9(b)(2). 

3. Are required to 

conduct a performance 

test 

Submit a 

notification of 

intent to 

conduct a 

performance test

60 calendar days 

before the 

performance test 

is scheduled to 

begin 

§63.7(b)(1). 

4. Are required to 

conduct a compliance 

Submit a 

Notification of 

60 calendar days 

following the 

§63.9(h) and 

§63.10(d)(2).
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demonstration that 

includes a performance 

test according to the 

requirements in Table 4 

to this subpart 

Compliance 

Status, 

including the 

performance test 

results 

completion of the 

performance test, 

by the close of 

business 

5. Are required to 

conduct a compliance 

demonstration required 

in Table 5 to this 

subpart that does not 

include a performance 

test (i.e., compliance 

demonstrations for the 

work practice 

standards) 

Submit a 

Notification of 

Compliance 

Status 

30 calendar days 

following the 

completion of the 

compliance 

demonstrations, 

by the close of 

business 

§63.9(h). 

6. Request a routine 

control device 

maintenance exemption 

according to 

§63.8420(d) 

Submit your 

request for the 

exemption 

30 calendar days 

before the 

compliance date 

specified in 

§63.8395. 

As stated in §63.8485, you must submit each report that 

applies to you according to the following table: 

Table 9 to Subpart JJJJJ of Part 63--Requirements for Reports 

You must 

submit... The report must contain... 

You must submit 

the report... 

1. A 

compliance 

report. 

a. If there are no deviations from any 

emission limitations (emission limits, 

operating limits) that apply to you, a 

statement that there were no deviations 

from the emission limitations during the 

reporting period. If there were no 

periods during which the CMS was out-ofcontrol as specified in your OM&M plan, a 

statement that there were no periods 

during which the CMS was out-of-control 

during the reporting period. 

Semiannually 

according to the 

requirements in 

§63.8485(b). 

b. If you have a deviation from any 

emission limitation (emission limit, 

operating limit) during the reporting 

period, the report must contain the 

information in §63.8485(c)(9). If there 

were periods during which the CMS was 

out-of-control, as specified in your OM&M 

plan, the report must contain the 

information in §63.8485(d). 

Semiannually 

according to the 

requirements in 

§63.8485(b). 
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As stated in §63.8505, you must comply with the General 

Provisions in §§63.1 through 63.16 that apply to you according 

to the following table: 

Table 10 to Subpart JJJJJ of Part 63--Applicability of General 

Provisions to Subpart JJJJJ 

Citation Subject Brief Description 

Applies to 

Subpart JJJJJ? 

§63.1 Applicability. Initial applicability 

determination; 

applicability after 

standard established; 

permit requirements; 

extensions, 

notifications. 

Yes. 

§63.2 Definitions. Definitions for part 

63 standards. 

Yes. 

§63.3 Units and 

Abbreviations. 

Units and 

abbreviations for 

part 63 standards. 

Yes. 

§63.4 Prohibited 

Activities. 

Compliance date; 

circumvention; 

severability. 

Yes. 

§63.5 Construction/ 

Reconstruction. 

Applicability; 

applications; 

approvals. 

Yes. 

§63.6(a) Applicability. General Provisions 

(GP) apply unless 

compliance extension; 

GP apply to area 

sources that become 

major. 

Yes. 

§63.6(b)(1)-(4) Compliance 

Dates for New 

and 

Reconstructed 

sources. 

Standards apply at 

effective date; 3 

years after effective 

date; upon startup; 

10 years after 

construction or 

reconstruction 

commences for section 

112(f). 

Yes. 

§63.6(b)(5) Notification. Must notify if 

commenced 

construction or 

reconstruction after 

proposal. 

Yes. 
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Citation Subject Brief Description 

Applies to 

Subpart JJJJJ? 

§63.6(b)(6) [Reserved]. No. 

§63.6(b)(7) Compliance 

Dates for New 

and 

Reconstructed 

Area Sources 

That Become 

Major. 

Area sources that 

become major must 

comply with major 

source standards 

immediately upon 

becoming major, 

regardless of whether 

required to comply 

when they were area 

sources. 

Yes. 

§63.6(c)(1)-(2) Compliance 

Dates for 

Existing 

Sources. 

Comply according to 

date in subpart, 

which must be no 

later than 3 years 

after effective date; 

for section 112(f) 

standards, comply 

within 90 calendar 

days of effective 

date unless 

compliance extension. 

Yes. 

§63.6(c)(3)-(4) [Reserved]. No. 

§63.6(c)(5) Compliance 

Dates for 

Existing Area 

Sources That 

Become Major. 

Area sources that 

become major must 

comply with major 

source standards by 

date indicated in 

subpart or by 

equivalent time 

period (for example, 

3 years). 

Yes. 

§63.6(d) [Reserved]. No. 

§63.6(e)(1)(i) Operation & 

Maintenance. 

General Duty to 

minimize emissions. 

No. See 

§63.8420(b) for 

general duty 

requirement. 

§63.6(e)(1)(ii) Operation & 

Maintenance. 

Requirement to 

correct malfunctions 

ASAP. 

No. 

§63.6(e)(1)(iii) Operation & 

Maintenance. 

Operation and 

maintenance 

requirements 

enforceable 

independent of 

emissions 

limitations. 

Yes. 

§63.6(e)(2) [Reserved]. No. 
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Citation Subject Brief Description 

Applies to 

Subpart JJJJJ? 

§63.6(e)(3) Startup, 

Shutdown, and 

Malfunction 

Plan (SSMP). 

Requirement for 

startup, shutdown, 

and malfunction (SSM) 

and SSMP; content of 

SSMP. 

No. 

§63.6(f)(1) Compliance 

Except During 

SSM. 

You must comply with 

emission standards at 

all times except 

during SSM. 

No. 

§63.6(f)(2)-(3) Methods for 

Determining 

Compliance. 

Compliance based on 

performance test, 

operation and 

maintenance plans, 

records, inspection. 

Yes. 

§63.6(g) Alternative 

Standard. 

Procedures for 

getting an 

alternative standard. 

Yes. 

§63.6(h) Opacity/VE 

Standards. 

Requirements for 

opacity and VE 

standards. 

No, not 

applicable. 

§63.6(i) Compliance 

Extension. 

Procedures and 

criteria for 

Administrator to 

grant compliance 

extension. 

Yes. 

§63.6(j) Presidential 

Compliance 

Exemption. 

President may exempt 

source category. 

Yes. 

§63.7(a)(1)-(2) Performance 

Test Dates. 

Dates for conducting 

initial performance 

testing and other 

compliance 

demonstrations for 

emission limits and 

work practice 

standards; must 

conduct 180 calendar 

days after first 

subject to rule. 

Yes. 

§63.7(a)(3) Section 114 

Authority. 

Administrator may 

require a performance 

test under CAA 

section 114 at any 

time. 

Yes. 
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Citation Subject Brief Description 

Applies to 

Subpart JJJJJ? 

§63.7(a)(4) Notification of 

Delay in 

Performance 

Testing Due To 

Force Majeure. 

Must notify 

Administrator of 

delay in performance 

testing due to force 

majeure. 

Yes. 

§63.7(b)(1) Notification of 

Performance 

Test. 

Must notify 

Administrator 60 

calendar days before 

the test. 

Yes. 

§63.7(b)(2) Notification of 

Rescheduling. 

Must notify 

Administrator 5 

calendar days before 

scheduled date of 

rescheduled date. 

Yes. 

§63.7(c) Quality 

Assurance(QA)/ 

Test Plan. 

Requirements; test 

plan approval 

procedures; 

performance audit 

requirements; 

internal and external 

QA procedures for 

testing. 

Yes. 

§63.7(d) Testing 

Facilities. 

Requirements for 

testing facilities. 

Yes. 

§63.7(e)(1) Conditions for 

Conducting 

Performance 

Tests. 

Cannot conduct 

performance tests 

during SSM; not a 

violation to exceed 

standard during SSM. 

No, §63.8445 

specifies 

requirements. 

§63.7(e)(2)-(3) Conditions for 

Conducting 

Performance 

Tests. 

Must conduct 

according to subpart 

and EPA test methods 

unless Administrator 

approves alternative; 

must have at least 

three test runs of at 

least 1 hour each; 

compliance is based 

on arithmetic mean of 

three runs; 

conditions when data 

from an additional 

test run can be used. 

Yes. 

§63.7(e)(4) Testing under 

Section 114 

Administrator’s 

authority to require 

testing under section 

114 of the Act. 

Yes. 
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Citation Subject Brief Description 

Applies to 

Subpart JJJJJ? 

§63.7(f) Alternative 

Test Method. 

Procedures by which 

Administrator can 

grant approval to use 

an alternative test 

method. 

Yes. 

§63.7(g) Performance 

Test Data 

Analysis. 

Must include raw data 

in performance test 

report; must submit 

performance test data 

60 calendar days 

after end of test 

with the notification 

of compliance status. 

Yes. 

§63.7(h) Waiver of 

Tests. 

Procedures for 

Administrator to 

waive performance 

test. 

Yes. 

§63.8(a)(1) Applicability 

of Monitoring 

Requirements. 

Subject to all 

monitoring 

requirements in 

subpart. 

Yes. 

§63.8(a)(2) Performance 

Specifications. 

Performance 

Specifications in 

appendix B of 40 CFR 

part 60 apply. 

Yes. 

§63.8(a)(3) [Reserved]. No. 

§63.8(a)(4) Monitoring with 

Flares. 

Requirements for 

flares in §63.11 

apply. 

No, not 

applicable. 

§63.8(b)(1) Monitoring. Must conduct 

monitoring according 

to standard unless 

Administrator 

approves alternative. 

Yes. 

§63.8(b)(2)-(3) Multiple 

Effluents and 

Multiple 

Monitoring 

Systems. 

Specific requirements 

for installing and 

reporting on 

monitoring systems. 

Yes. 

§63.8(c)(1) Monitoring 

System 

Operation and 

Maintenance. 

Maintenance 

consistent with good 

air pollution control 

practices. 

Yes. 

§63.8(c)(1)(i) Routine and 

Predictable 

SSM. 

Reporting 

requirements for SSM 

when action is 

described in SSMP. 

No. 
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Citation Subject Brief Description 

Applies to 

Subpart JJJJJ? 

§63.8(c)(1)(ii) SSM not in 

SSMP. 

Reporting 

requirements for SSM 

when action is not 

described in SSMP. 

Yes. 

§63.8(c)(1)(iii) Compliance with 

Operation and 

Maintenance 

Requirements. 

How Administrator 

determines if source 

complying with 

operation and 

maintenance 

requirements. 

No. 

§63.8(c)(2)-(3) Monitoring 

System 

Installation. 

Must install to get 

representative 

emission and 

parameter 

measurements. 

Yes. 

§63.8(c)(4) CMS 

Requirements. 

Requirements for CMS. No, §63.8450 

specifies 

requirements. 

§63.8(c)(5) Continuous 

Opacity 

Monitoring 

System (COMS) 

Minimum 

Procedures. 

COMS minimum 

procedures. 

No, not 

applicable. 

§63.8(c)(6) CMS 

Requirements. 

Zero and high level 

calibration check 

requirements. 

Yes. 

§63.8(c)(7)-(8) CMS 

Requirements. 

Out-of-control 

periods. 

Yes. 

§63.8(d)(1) and 

(2) 

CMS Quality 

Control. 

Requirements for CMS 

quality control. 

Yes. 

§63.8(d)(3) CMS Quality 

Control. 

Written procedures 

for CMS. 

No, 

§63.8425(b)(9) 

specifies 

requirements 

§63.8(e) CMS Performance 

Evaluation. 

Requirements for CMS 

performance 

evaluation. 

Yes. 

§63.8(f)(1)-(5) Alternative 

Monitoring 

Method. 

Procedures for 

Administrator to 

approve alternative 

monitoring. 

Yes. 
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Citation Subject Brief Description 

Applies to 

Subpart JJJJJ? 

§63.8(f)(6) Alternative to 

Relative 

Accuracy Test. 

Procedures for 

Administrator to 

approve alternative 

relative accuracy 

test for continuous 

emissions monitoring 

systems (CEMS). 

No, not 

applicable. 

§63.8(g) Data Reduction. COMS and CEMS data 

reduction 

requirements. 

No, not 

applicable. 

§63.9(a) Notification 

Requirements. 

Applicability; State 

delegation. 

Yes. 

§63.9(b) Initial 

Notifications. 

Requirements for 

initial 

notifications. 

Yes. 

§63.9(c) Request for 

Compliance 

Extension. 

Can request if cannot 

comply by date or if 

installed BACT/LAER. 

Yes. 

§63.9(d) Notification of 

Special 

Compliance 

Requirements 

for New Source. 

For sources that 

commence construction 

between proposal and 

promulgation and want 

to comply 3 years 

after effective date. 

Yes. 

§63.9(e) Notification of 

Performance 

Test. 

Notify Administrator 

60 calendar days 

prior. 

Yes. 

§63.9(f) Notification of 

VE/Opacity 

Test. 

Notify Administrator 

30 calendar days 

prior. 

No, not 

applicable. 

§63.9(g)(1) Additional 

Notifications 

When Using CMS. 

Notification of 

performance 

evaluation. 

Yes 

§63.9(g)(2)-(3) Additional 

Notifications 

When Using CMS. 

Notification of COMS 

data use; 

notification that 

relative accuracy 

alternative criterion 

were exceeded. 

No, not 

applicable. 

§63.9(h) Notification of 

Compliance 

Status. 

Contents; submittal 

requirements. 

Yes. 
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Citation Subject Brief Description 

Applies to 

Subpart JJJJJ? 

§63.9(i) Adjustment of 

Submittal 

Deadlines. 

Procedures for 

Administrator to 

approve change in 

when notifications 

must be submitted. 

Yes. 

§63.9(j) Change in 

Previous 

Information. 

Must submit within 15 

calendar days after 

the change. 

Yes. 

§63.10(a) Recordkeeping/ 

Reporting. 

Applicability; 

general information. 

Yes. 

§63.10(b)(1) General 

Recordkeeping 

Requirements. 

General requirements. Yes. 

§63.10(b)(2)(i) Records Related 

to SSM. 

Recordkeeping of 

occurrence and 

duration of startups 

and shutdowns. 

No. 

§63.10(b)(2)(ii) Records Related 

to SSM. 

Recordkeeping of 

failures to meet a 

standard. 

No. See 

§63.8490(c)(2) 

for 

recordkeeping 

of (1) date, 

time and 

duration; (2) 

listing of 

affected source 

or equipment, 

and an estimate 

of the volume 

of each 

regulated 

pollutant 

emitted over 

the standard; 

and (3) actions 

to minimize 

emissions and 

correct the 

failure. 

§63.10(b)(2)(iii) Records Related 

to SSM. 

Maintenance records. Yes. 

§63.10(b)(2)(iv)-

(v) 

Records Related 

to SSM. 

Actions taken to 

minimize emissions 

during SSM. 

No. 

§63.10(b)(2)(vi)-

(xii) and (xiv) 

CMS Records. Records when CMS is 

malfunctioning, 

inoperative or outof-control. 

Yes. 
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Citation Subject Brief Description 

Applies to 

Subpart JJJJJ? 

§63.10(b)(2)(xiii) Records. Records when using 

alternative to 

relative accuracy 

test. 

No, not 

applicable. 

§63.10(b)(3) Records. Applicability 

Determinations. 

Yes. 

§63.10(c)(1)-(15) Records. Additional records 

for CMS 

No, §§63.8425 

and 63.8490 

specify 

requirements. 

§63.10(d)(1) and 

(2) 

General 

Reporting 

Requirements. 

Requirements for 

reporting; 

performance test 

results reporting. 

Yes. 

§63.10(d)(3) Reporting 

Opacity or VE 

Observations. 

Requirements for 

reporting opacity and 

VE. 

No, not 

applicable. 

§63.10(d)(4) Progress 

Reports. 

Must submit progress 

reports on schedule 

if under compliance 

extension. 

Yes. 

§63.10(d)(5) SSM 

Reports. 

Contents and 

submission. 

No. See 

§63.8485(c)(9) 

for malfunction 

reporting 

requirements. 

§63.10(e)(1)-(3) Additional CMS 

Reports. 

Requirements for CMS 

reporting. 

No, §§63.8425 

and 63.8485 

specify 

requirements. 

§63.10(e)(4) Reporting COMS 

data. 

Requirements for 

reporting COMS data 

with performance test 

data. 

No, not 

applicable. 

§63.10(f) Waiver for 

Recordkeeping/ 

Reporting. 

Procedures for 

Administrator to 

waive. 

Yes. 

§63.11 Flares. Requirement for 

flares. 

No, not 

applicable. 

§63.12 Delegation. State authority to 

enforce standards. 

Yes. 

§63.13 Addresses. Addresses for 

reports, 

notifications, 

requests. 

Yes. 
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Citation Subject Brief Description 

Applies to 

Subpart JJJJJ? 

§63.14 Incorporation 

by Reference. 

Materials 

incorporated by 

reference. 

Yes. 

§63.15 Availability of 

Information. 

Information 

availability; 

confidential 

information. 

Yes. 

§63.16 Performance 

Track 

Provisions. 

Requirements for 

Performance Track 

member facilities. 

Yes. 

4. Part 63 is amended by revising subpart KKKKK to read as 

follows: 

Subpart KKKKK--National Emission Standards for Hazardous Air 

Pollutants for Clay Ceramics Manufacturing 

Sec. 

What This Subpart Covers 

63.8530 What is the purpose of this subpart? 

63.8535 Am I subject to this subpart? 

63.8540 What parts of my plant does this subpart cover? 

63.8545 When do I have to comply with this subpart? 

Emission Limitations and Work Practice Standards 

63.8555 What emission limitations and work practice standards 

must I meet? 

63.8560 What are my options for meeting the emission 

limitations and work practice standards? 

General Compliance Requirements 

63.8570 What are my general requirements for complying with 

this subpart? 

63.8575 What do I need to know about operation, maintenance, 

and monitoring plans? 

Testing and Initial Compliance Requirements 

63.8585 By what date must I conduct performance tests? 
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63.8590 When must I conduct subsequent performance tests? 

63.8595 How do I conduct performance tests and establish 

operating limits? 

63.8600 What are my monitoring installation, operation, and 

maintenance requirements? 

63.8605 How do I demonstrate initial compliance with the 

emission limitations and work practice standards? 

Continuous Compliance Requirements 

63.8615 How do I monitor and collect data to demonstrate 

continuous compliance? 

63.8620 How do I demonstrate continuous compliance with the 

emission limitations and work practice standards? 

Notifications, Reports, and Records 

63.8630 What notifications must I submit and when? 

63.8635 What reports must I submit and when? 

63.8640 What records must I keep? 

63.8645 In what form and for how long must I keep my records? 

Other Requirements and Information 

63.8655 What parts of the General Provisions apply to me? 

63.8660 Who implements and enforces this subpart? 

63.8665 What definitions apply to this subpart? 

Tables to Subpart KKKKK of Part 63 

Table 1 to Subpart KKKKK of Part 63--Emission Limits 

Table 2 to Subpart KKKKK of Part 63--Operating Limits 

Table 3 to Subpart KKKKK of Part 63--Work Practice Standards 

Table 4 to Subpart KKKKK of Part 63--Requirements for 

Performance Tests 

Table 5 to Subpart KKKKK of Part 63--Toxic Equivalency Factors 

Table 6 to Subpart KKKKK of Part 63--Initial Compliance with 

Emission Limitations and Work Practice Standards 

Table 7 to Subpart KKKKK of Part 63--Continuous Compliance with 

Emission Limitations and Work Practice Standards 

Table 8 to Subpart KKKKK of Part 63--Compliance Dates 

Table 9 to Subpart KKKKK of Part 63--Requirements for 

Notifications 

Table 10 to Subpart KKKKK of Part 63--Requirements for Reports 

Table 11 to Subpart KKKKK of Part 63--Applicability of General 

Provisions to Subpart KKKKK 
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What This Subpart Covers 

§63.8530 What is the purpose of this subpart? 

This subpart establishes national emission limitations and 

work practice standards for hazardous air pollutants (HAP) 

emitted from clay ceramics manufacturing facilities. This 

subpart also establishes requirements to demonstrate initial and 

continuous compliance with the emission limitations and work 

practice standards. 

§63.8535 Am I subject to this subpart? 

You are subject to this subpart if you own or operate a 

clay ceramics manufacturing facility that is, is located at, or 

is part of a major source of HAP emissions according to the 

criteria in paragraphs (a) and (b) of this section. 

(a) A clay ceramics manufacturing facility is a plant site 

that manufactures pressed floor tile, pressed wall tile, other 

pressed tile, or sanitaryware (e.g., sinks and toilets). Clay 

ceramics manufacturing facilities typically process clay, shale, 

and various additives; form the processed materials into tile or 

sanitaryware shapes; and dry and fire the ceramic products. 

Glazes are applied to many tile and sanitaryware products. A 

plant site that manufactures refractory products, as defined in 

40 CFR 63.9824, or brick and structural clay products (BSCP), as 
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defined in 40 CFR 63.8515, is not a clay ceramics manufacturing 

facility. 

(b) A major source of HAP emissions is any stationary 

source or group of stationary sources within a contiguous area 

under common control 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. 

§63.8540 What parts of my plant does this subpart cover? 

(a) This subpart applies to each existing, new, or 

reconstructed affected source at a clay ceramics manufacturing 

facility. 

(b) Each existing, new, or reconstructed ceramic tile 

roller kiln, sanitaryware tunnel kiln, sanitaryware shuttle 

kiln, ceramic tile glaze line using glaze spraying, sanitaryware 

glaze spray booth, ceramic tile spray dryer, and floor tile 

press dryer is an affected source. 

(c) Process units not subject to the requirements of this 

subpart are listed in paragraphs (c)(1) through (9) of this 

section. 

(1) Tunnel, roller or shuttle kilns that are used 

exclusively for refiring. 
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(2) Tunnel, roller or shuttle kilns that are used 

exclusively for setting glazes on previously fired products. 

(3) Glaze spray operations that are used exclusively with 

those kilns listed in paragraphs (c)(1) and (2) of this section. 

(4) Process units listed in paragraphs (c)(1) through (3) 

of this section that are permitted to, but do not, process 

first-fire ware, until such time as they begin to process firstfire ware. 

(5) Glaze spray operations that on average use wet glazes 

containing less than 0.1 (weight) percent metal HAP (dry weight 

basis) per spray booth over an entire calendar year. 

(6) Raw material processing and handling. 

(7) Wall tile press dryers. 

(8) Sanitaryware ware dryers. 

(9) Sources covered by subparts JJJJJ and SSSSS of this 

part. 

(d) A source is a new affected source if construction of 

the affected source began after December 18, 2014, and you met 

the applicability criteria at the time you began construction. 

(e) An affected source is reconstructed if you meet the 

criteria as defined in §63.2. 

(f) An affected source is existing if it is not new or 

reconstructed. 
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§63.8545 When do I have to comply with this subpart? 

(a) You must comply with this subpart no later than the 

compliance dates in Table 8 to this subpart. 

(b) You must meet the notification requirements in §63.8630 

according to the schedule in §63.8630 and in subpart A of this 

part. Some of the notifications must be submitted before you are 

required to comply with the emission limitations in this 

subpart. 

Emission Limitations and Work Practice Standards 

§63.8555 What emission limitations and work practice standards 

must I meet? 

(a) You must meet each emission limit in Table 1 to this 

subpart that applies to you. 

(b) You must meet each operating limit in Table 2 to this 

subpart that applies to you. 

(c) You must meet each work practice standard in Table 3 to 

this subpart that applies to you. 

§63.8560 What are my options for meeting the emission 

limitations and work practice standards? 

(a) To meet the emission limitations in Tables 1 and 2 to 

this subpart, you must use one or more of the options listed in 

paragraphs (a)(1) and (2) of this section. 
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(1) Emissions control system. Use an emissions capture and 

collection system and an air pollution control device (APCD) and 

demonstrate that the resulting emissions meet the emission 

limits in Table 1 to this subpart, and that the capture and 

collection system and APCD meet the applicable operating limits 

in Table 2 to this subpart. 

(2) Process changes. Use low-HAP raw materials or implement 

manufacturing process changes and demonstrate that the resulting 

emissions or emissions reductions meet the emission limits in 

Table 1 to this subpart. 

(b) To meet the work practice standards for affected 

sanitaryware shuttle kilns, you must comply with the 

requirements listed in Table 3 to this subpart. 

(c) To meet the work practice standards for affected 

sources during periods of startup and shutdown, you must comply 

with the requirements listed in Table 3 to this subpart. 

General Compliance Requirements 

§63.8570 What are my general requirements for complying with 

this subpart? 

(a) You must be in compliance with the emission limitations 

(including operating limits) in this subpart at all times, 

except during periods of routine control device maintenance as 

specified in paragraph (d) of this section. 
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(b) At all times, you must operate and maintain any 

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 

emissions. 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. During the period between 

the compliance date specified for your affected source in 

§63.8545 and the date upon which continuous monitoring systems 

(CMS) (e.g., continuous parameter monitoring systems) have been 

installed and verified 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. 

(c) For each affected source that is subject to the 

emission limits specified in Table 1 to this subpart, you must 

prepare and implement a written operation, maintenance, and 
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monitoring (OM&M) plan according to the requirements in 

§63.8575. 

(d) If you own or operate an affected source that is 

subject to the emission limits specified in Table 1 to this 

subpart and must perform routine maintenance on the control 

device for that affected source, you may bypass the source 

control device and continue operating the affected source upon 

approval by the Administrator provided you satisfy the 

conditions listed in paragraphs (d)(1) through (5) of this 

section. 

(1) You must request a routine control device maintenance 

exemption from the Administrator. Your request must justify the 

need for the routine maintenance on the control device and the 

time required to accomplish the maintenance activities, describe 

the maintenance activities and the frequency of the maintenance 

activities, explain why the maintenance cannot be accomplished 

during source shutdowns, describe how you plan to comply with 

paragraph (b) of this section during the maintenance, and 

provide any other documentation required by the Administrator. 

(2) The routine control device maintenance exemption must 

not exceed 4 percent of the annual operating uptime for each 

affected source. 
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(3) The request for the routine control device maintenance 

exemption, if approved by the Administrator, must be 

incorporated by reference in and attached to the affected 

source’s title V permit. 

(4) You must minimize HAP emissions during the period when 

the affected source is operating and the control device is 

offline by complying with the applicable work practice standard 

in Table 3 to this subpart. 

(5) You must minimize the time period during which the 

affected source is operating and the control device is offline. 

(e) If you own or operate an affected kiln that is subject 

to the work practice standard specified in Table 3 to this 

subpart, you must be in compliance with that work practice 

standard at all times, except during periods of natural gas 

curtailment or other periods when natural gas is not available. 

(f) You must be in compliance with the provisions of 

subpart A of this part, except as noted in Table 9 to this 

subpart. 

§63.8575 What do I need to know about operation, maintenance, 

and monitoring plans? 

(a) For each affected source that is subject to the 

emission limits specified in Table 1 to this subpart, you must 

prepare, implement, and revise as necessary an OM&M plan that 
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includes the information in paragraph (b) of this section. Your 

OM&M plan must be available for inspection by the delegated 

authority upon request. 

(b) Your OM&M plan must include, as a minimum, the 

information in paragraphs (b)(1) through (13) of this section. 

(1) Each process and APCD to be monitored, the type of 

monitoring device that will be used, and the operating 

parameters that will be monitored. 

(2) A monitoring schedule that specifies the frequency that 

the parameter values will be determined and recorded. 

(3) The limits for each parameter that represent continuous 

compliance with the emission limitations in §63.8555. The limits 

must be based on values of the monitored parameters recorded 

during performance tests. 

(4) Procedures for the proper operation and routine and 

long-term maintenance of each APCD, including a maintenance and 

inspection schedule that is consistent with the manufacturer’s 

recommendations. 

(5) Procedures for installing the CMS sampling probe or 

other interface at a measurement location relative to each 

affected process unit such that the measurement is 

representative of control of the exhaust emissions (e.g., on or 

downstream of the last APCD). 
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(6) Performance and equipment specifications for the sample 

interface, the pollutant concentration or parametric signal 

analyzer, and the data collection and reduction system. 

(7) Continuous monitoring system performance evaluation 

procedures and acceptance criteria (e.g., calibrations). 

(8) Procedures for the proper operation and maintenance of 

monitoring equipment consistent with the requirements in 

§§63.8600 and 63.8(c)(1), (3), (7), and (8). 

(9) Continuous monitoring system data quality assurance 

procedures consistent with the requirements in §63.8(d)(1) and 

(2). The owner or operator shall keep these written procedures 

on record 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 in §63.8(d)(2) 

is revised, the owner or operator shall keep previous (i.e., 

superseded) versions of the performance evaluation plan on 

record to be made available for inspection, upon request, 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). 
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(10) Continuous monitoring system recordkeeping and 

reporting procedures consistent with the requirements in 

§§63.8635 and 63.8640. 

(11) Procedures for responding to operating parameter 

deviations, including the procedures in paragraphs (b)(11)(i) 

through (iii) of this section. 

(i) Procedures for determining the cause of the operating 

parameter deviation. 

(ii) Actions necessary for correcting the deviation and 

returning the operating parameters to the allowable limits. 

(iii) Procedures for recording the times that the deviation 

began and ended, and corrective actions were initiated and 

completed. 

(12) Procedures for keeping records to document compliance. 

(13) If you operate an affected source and you plan to take 

the source control device out of service for routine 

maintenance, as specified in §63.8570(d), the procedures 

specified in paragraphs (b)(13)(i) and (ii) of this section. 

(i) Procedures for minimizing HAP emissions from the 

affected source during periods of routine maintenance of the 

source control device when the affected source is operating and 

the control device is offline. 
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(ii) Procedures for minimizing the duration of any period 

of routine maintenance on the source control device when the 

affected source is operating and the control device is offline. 

(c) Changes to the operating limits in your OM&M plan 

require a new performance test. If you are revising an operating 

limit parameter value, you must meet the requirements in 

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

(1) Submit a notification of performance test to the 

Administrator as specified in §63.7(b). 

(2) After completing the performance test to demonstrate 

that compliance with the emission limits can be achieved at the 

revised operating limit parameter value, you must submit the 

performance test results and the revised operating limits as 

part of the Notification of Compliance Status required under 

§63.9(h). 

(d) If you are revising the inspection and maintenance 

procedures in your OM&M plan, you do not need to conduct a new 

performance test. 

Testing and Initial Compliance Requirements 

§63.8585 By what date must I conduct performance tests? 

For each affected source that is subject to the emission 

limits specified in Table 1 to this subpart, you must conduct 

performance tests within 180 calendar days after the compliance 
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date that is specified for your source in §63.8545 and according 

to the provisions in §63.7(a)(2). 

§63.8590 When must I conduct subsequent performance tests? 

(a) For each affected source that is subject to the 

emission limits specified in Table 1 to this subpart, you must 

conduct a performance test before renewing your 40 CFR part 70 

operating permit or at least every 5 years following the initial 

performance test. 

(b) You must conduct a performance test when you want to 

change the parameter value for any operating limit specified in 

your OM&M plan. 

§63.8595 How do I conduct performance tests and establish 

operating limits? 

(a) You must conduct each performance test in Table 4 to 

this subpart that applies to you. 

(b) Before conducting the performance test, you must 

install and calibrate all monitoring equipment. 

(c) Each performance test must be conducted according to 

the requirements in §63.7 and under the specific conditions in 

Table 4 to this subpart. Stacks to be tested at sanitaryware 

manufacturing facilities shall be limited to products of 

combustion (POC) stacks and those cooling stacks with an oxygen 

content at or below 20.5 percent. 
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(d) Performance tests shall be conducted 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. 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 shall make available to the Administrator such 

records as may be necessary to determine the conditions of 

performance tests. 

(e) You must conduct at least three separate test runs for 

each performance test required in this section, as specified in 

§63.7(e)(3). Each test run must last at least 1 hour. 

(f) You must use the data gathered during the performance 

test and the equations in paragraphs (f)(1) through (4) of this 

section to determine compliance with the emission limitations. 

(1) To determine compliance with the production-based 

particulate matter (PM) and mercury (Hg) emission limits for 

ceramic tile roller kilns and sanitaryware tunnel kilns in Table 

1 to this subpart, you must calculate your mass emissions per 

unit of production for each test run using Equation 1: 
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P

ER MP  (Eq. 1) 

Where: 

MP = mass per unit of production, kilograms (pounds) of 

pollutant per megagram (ton) of throughput 

ER = mass emission rate of pollutant (PM or Hg) during each 

performance test run, kilograms (pounds) per hour 

P = production rate during each performance test run, 

megagrams (tons) of throughput per hour. 

(2) To determine compliance with the PM emission limits for 

ceramic tile glaze lines with glaze spraying and sanitaryware 

glaze spray booths in Table 1 to this subpart, you must 

calculate your mass emissions per unit of first-fire glaze 

sprayed (dry weight basis) for each test run using Equation 2: 

G

ER MG  (Eq. 2) 

Where: 

MG = mass per unit of glaze application, kilograms (pounds) of 

PM per megagram (ton) of first-fire glaze sprayed (dry 

weight basis) 

ER = mass emission rate of PM during each performance test 

run, kilograms (pounds) per hour 

G = glaze application rate during each performance test run, 

megagrams (tons) of first-fire glaze sprayed per hour 

(dry weight basis).

(3) To determine compliance with the dioxin/furan emission 

limits for tunnel and roller kilns, ceramic tile spray dryers, 

and floor tile press dryers in Table 1 to this subpart, you must 
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calculate the sum of the 2,3,7,8-tetrachlorodibenzo-p-dioxin 

(2,3,7,8-TCDD) toxic equivalents (TEQs) for each test run using 

Equation 3: 

 

T P

M TEF

TEQ

r

n

i

i i







1

 (Eq. 3) 

Where: 

TEQ = sum of the 2,3,7,8-TCDD TEQs, nanograms per kilogram of 

throughput processed. 

Mi = mass of dioxin or furan congener i during performance 

test run, nanograms 

TEFi = 2,3,7,8-TCDD toxic equivalency factor (TEF) for congener 

i, as provided in Table 5 to this subpart 

n = number of congeners included in TEQ 

Tr = time of performance test run, hours 

P = production rate during performance test run, kilograms of 

throughput processed per hour. 

(4) To determine compliance with the health-based standard 

for acid gas HAP for clay ceramics manufacturing facilities in 

Table 1 to this subpart, you must: 

(i) Calculate the HCl-equivalent emissions for HF and HCl 

for each tunnel or roller kiln at your facility using Equation 

4: 





 



















  

HF

HCl

i HCl HF RfC

RfC E E E (Eq. 4) 
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Where: 

Ei = HCl-equivalent emissions for kiln i, kilograms (pounds) 

per hour 

EHCl = emissions of HCl, kilograms (pounds) per hour 

EHF = emissions of HF, kilograms (pounds) per hour 

RfCHCl = reference concentration for HCl, 20 micrograms per 

cubic meter 

RfCHF = reference concentration for HF, 14 micrograms per cubic 

meter 

(ii) If you have multiple tunnel or roller kilns at your 

facility, sum the HCl-equivalent values for all tunnel or roller 

kilns at the facility using Equation 5: 





n

i

Etotal Ei

1

 (Eq. 5) 

Where: 

Etotal = HCl-equivalent emissions for total of all kilns at 

facility, kilograms (pounds) per hour 

Ei = HCl-equivalent emissions for kiln i, kilograms (pounds) 

per hour 

n = number of tunnel kilns at facility 

(iii) Compare this value to the health-based standard in 

Table 1 to this subpart. 

(g) You must establish each site-specific operating limit 

in Table 2 to this subpart that applies to you as specified in 

paragraph (g)(1) of this section and in Table 4 to this subpart. 
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(1)(i) If you do not have an APCD installed on your tunnel 

or roller kiln, you must calculate the maximum potential HClequivalent emissions for HF and HCl for each tunnel or roller 

kiln at your facility using Equation 6: 

     



 



















  

HF

HCl

i i iHCl iHF RfC

RfC Emax Cap MP MP (Eq. 6) 

Where: 

Emax i = maximum potential HCl-equivalent emissions for kiln i, 

kilograms (pounds) per hour 

Capi = design capacity for kiln i, megagrams (tons) of 

throughput per hour 

MPiHCl = mass of HCl per unit of production for kiln i, 

kilograms (pounds) of HCl per megagram (ton) of 

throughput 

MPiHF = mass of HF per unit of production for kiln i, kilograms 

(pounds) of HF per megagram (ton) of throughput 

RfCHCl = reference concentration for HCl, 20 micrograms per 

cubic meter 

RfCHF = reference concentration for HF, 14 micrograms per cubic 

meter 

(ii) If you have multiple tunnel or roller kilns at your 

facility, sum the maximum potential HCl-equivalent values for 

all tunnel or roller kilns at the facility using Equation 7: 





n

i

E total E i

1

max max (Eq. 7) 

Where: 

Emax total = maximum potential HCl-equivalent emissions for total of 
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all kilns at facility, kilograms (pounds) per hour 

Emax i = maximum potential HCl-equivalent emissions for kiln i, 

kilograms (pounds) per hour 

n = number of kilns at facility 

(iii) If you have a single tunnel or roller kiln at your 

facility and the total facility maximum potential HCl-equivalent 

emissions (Emax total) are greater than the HCl-equivalent limit in 

Table 1 to this subpart, you must determine the maximum process 

rate for the kiln using Equation 8 that would ensure the total 

facility maximum potential HCl-equivalent emissions remain at or 

below the HCl-equivalent limit. The maximum process rate would 

become your operating limit for process rate and must be 

included in your OM&M plan. 

   



 

























HF

HCl

iHCl iHF

i

RfC

RfC MP MP

HCl- eq Pmax (Eq. 8) 

Where: 

Pmax i = maximum process rate for kiln i, megagrams (tons) per 

hour 

HCl-eq = HCl-equivalent limit in Table 1 to this subpart, 62 

kilograms (140 pounds) per hour 

MPiHCl = mass of HCl per unit of production for kiln i, 

kilograms (pounds) of HCl per megagram (ton) of 

throughput 

MPiHF = mass of HF per unit of production for kiln i, kilograms 

(pounds) of HF per megagram (ton) of throughput 

RfCHCl = reference concentration for HCl, 20 micrograms per 
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cubic meter 

RfCHF = reference concentration for HF, 14 micrograms per cubic 

meter 

(iv) If you have multiple tunnel or roller kilns at your 

facility and the total facility maximum potential HCl-equivalent 

emissions (Emax total) are greater than the HCl-equivalent limit in 

Table 1 to this subpart, you must determine the combination of 

maximum process rates that would ensure that total facility 

maximum potential HCl-equivalent remains at or below the HClequivalent limit. The maximum process rates would become your 

operating limits for process rate and must be included in your 

OM&M plan. 

(h) For each affected source that is subject to the 

emission limits specified in Table 1 to this subpart and is 

equipped with an APCD that is not addressed in Table 2 to this 

subpart or that is using process changes as a means of meeting 

the emission limits in Table 1 to this subpart, you must meet 

the requirements in §63.8(f) and paragraphs (h)(1) and (2) of 

this section. 

(1) Submit a request for approval of alternative monitoring 

procedures to the Administrator no later than the notification 

of intent to conduct a performance test. The request must 

contain the information specified in paragraphs (h)(1)(i) 

through (iv) of this section. 
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(i) A description of the alternative APCD or process 

changes. 

(ii) The type of monitoring device or procedure that will 

be used. 

(iii) The operating parameters that will be monitored. 

(iv) The frequency that the operating parameter values will 

be determined and recorded to establish continuous compliance 

with the operating limits. 

(2) Establish site-specific operating limits during the 

performance test based on the information included in the 

approved alternative monitoring procedures request and, as 

applicable, as specified in Table 4 to this subpart. 

§63.8600 What are my monitoring installation, operation, and 

maintenance requirements? 

(a) You must install, operate, and maintain each CMS 

according to your OM&M plan and the requirements in paragraphs 

(a)(1) through (5) of this section. 

(1) Conduct a performance evaluation of each CMS according 

to your OM&M plan. 

(2) The CMS must complete a minimum of one cycle of 

operation for each successive 15-minute period. To have a valid 

hour of data, you must have at least three of four equally 

spaced data values (or at least 75 percent if you collect more 
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than four data values per hour) for that hour (not including 

startup, shutdown, malfunction, out-of-control periods, or 

periods of routine control device maintenance covered by a 

routine control device maintenance exemption as specified in 

§63.8570(d)). 

(3) Determine and record the 3-hour block averages of all 

recorded readings, calculated after every 3 hours of operation 

as the average of the previous 3 operating hours. To calculate 

the average for each 3-hour average period, you must have at 

least 75 percent of the recorded readings for that period (not 

including startup, shutdown, malfunction, out-of-control 

periods, or periods of routine control device maintenance 

covered by a routine control device maintenance exemption as 

specified in §63.8570(d)). 

(4) Record the results of each inspection, calibration, and 

validation check. 

(5) At all times, maintain the monitoring equipment 

including, but not limited to, maintaining necessary parts for 

routine repairs of the monitoring equipment. 

(b) For each liquid flow measurement device, you must meet 

the requirements in paragraphs (a)(1) through (5) and paragraphs 

(b)(1) through (3) of this section. 
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(1) Locate the flow sensor in a position that provides a 

representative flowrate. 

(2) Use a flow sensor with a minimum measurement 

sensitivity of 2 percent of the liquid flowrate. 

(3) At least semiannually, conduct a flow sensor 

calibration check. 

(c) For each pressure measurement device, you must meet the 

requirements in paragraphs (a)(1) through (5) and paragraphs 

(c)(1) through (7) of this section. 

(1) Locate the pressure sensor(s) in or as close to a 

position that provides a representative measurement of the 

pressure. 

(2) Minimize or eliminate pulsating pressure, vibration, 

and internal and external corrosion. 

(3) Use a gauge with a minimum measurement sensitivity of 

0.5 inch of water or a transducer with a minimum measurement 

sensitivity of 1 percent of the pressure range. 

(4) Check the pressure tap daily to ensure that it is not 

plugged. 

(5) Using a manometer, check gauge calibration quarterly 

and transducer calibration monthly. 
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(6) Any time the sensor exceeds the manufacturer’s 

specified maximum operating pressure range, conduct calibration 

checks or install a new pressure sensor. 

(7) At least monthly, inspect all components for integrity, 

all electrical connections for continuity, and all mechanical 

connections for leakage. 

(d) For each pH measurement device, you must meet the 

requirements in paragraphs (a)(1) through (5) and paragraphs 

(d)(1) through (4) of this section. 

(1) Locate the pH sensor in a position that provides a 

representative measurement of pH. 

(2) Ensure the sample is properly mixed and representative 

of the fluid to be measured. 

(3) Check the pH meter’s calibration on at least two points 

every 8 hours of process operation. 

(4) At least monthly, inspect all components for integrity 

and all electrical connections for continuity. 

(e) For each bag leak detection system, you must meet the 

requirements in paragraphs (e)(1) through (11) of this section. 

(1) Each triboelectric bag leak detection system must be 

installed, calibrated, operated, and maintained according to the 

“Fabric Filter Bag Leak Detection Guidance,” (EPA-454/R-98-015, 

September 1997) (incorporated by reference, see §63.14). Other 
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types of bag leak detection systems must be installed, operated, 

calibrated, and maintained in a manner consistent with the 

manufacturer’s written specifications and recommendations. 

(2) The bag leak detection system must be certified by the 

manufacturer to be capable of detecting PM emissions at 

concentrations of 10 milligrams per actual cubic meter 

(0.0044 grains per actual cubic foot) or less. 

(3) The bag leak detection system sensor must provide an 

output of relative PM loadings. 

(4) The bag leak detection system must be equipped with a 

device to continuously record the output signal from the sensor. 

(5) The bag leak detection system must be equipped with an 

audible alarm system that will sound automatically when an 

increase in relative PM emissions over a preset level is 

detected. The alarm must be located where it is easily heard by 

plant operating personnel. 

(6) For positive pressure fabric filter systems, a bag leak 

detector must be installed in each baghouse compartment or cell. 

(7) For negative pressure or induced air fabric filters, 

the bag leak detector must be installed downstream of the fabric 

filter. 

(8) Where multiple detectors are required, the system’s 

instrumentation and alarm may be shared among detectors. 
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(9) The baseline output must be established by adjusting 

the range and the averaging period of the device and 

establishing the alarm set points and the alarm delay time 

according to section 5.0 of the “Fabric Filter Bag Leak 

Detection Guidance,” (EPA-454/R-98-015, September 1997) 

(incorporated by reference, see §63.14). 

(10) Following initial adjustment of the system, the 

sensitivity or range, averaging period, alarm set points, or 

alarm delay time may not be adjusted except as detailed in your 

OM&M plan. In no case may the sensitivity be increased by more 

than 100 percent or decreased more than 50 percent over a 365-

day period unless such adjustment follows a complete fabric 

filter inspection which demonstrates that the fabric filter is 

in good operating condition, as defined in section 5.2 of the 

“Fabric Filter Bag Leak Detection Guidance,” (EPA-454/R-98-015, 

September 1997) (incorporated by reference, see §63.14). Record 

each adjustment. 

(11) Record the results of each inspection, calibration, 

and validation check. 

(f) For each lime, chemical, or carbon feed rate 

measurement device, you must meet the requirements in paragraphs 

(a)(1) through (5) and paragraphs (f)(1) and (2) of this 

section. 
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(1) Locate the measurement device in a position that 

provides a representative feed rate measurement. 

(2) At least semiannually, conduct a calibration check. 

(g) For each temperature measurement device, you must meet 

the requirements in paragraphs (a)(1) through (5) and paragraphs 

(g)(1) through (3) of this section. 

(1) Locate the measurement device in a position that 

provides a representative temperature. 

(2) Use a measurement device with a minimum sensitivity of 

1 percent of the temperature being measured. 

(3) At least semiannually, conduct a calibration check. 

(h) Requests for approval of alternate monitoring 

procedures must meet the requirements in §§63.8595(h) and 

63.8(f). 

§63.8605 How do I demonstrate initial compliance with the 

emission limitations and work practice standards? 

(a) You must demonstrate initial compliance with each 

emission limitation and work practice standard that applies to 

you according to Table 6 to this subpart. 

(b) You must establish each site-specific operating limit 

in Table 2 to this subpart that applies to you according to the 

requirements in §63.8595 and Table 4 to this subpart. 
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(c) You must submit the Notification of Compliance Status 

containing the results of the initial compliance demonstration 

according to the requirements in §63.8630(e). 

Continuous Compliance Requirements 

§63.8615 How do I monitor and collect data to demonstrate 

continuous compliance? 

(a) You must monitor and collect data according to this 

section. 

(b) Except for periods of monitor malfunctions, associated 

repairs, and required quality assurance or control activities 

(including, as applicable, calibration checks and required zero 

and span adjustments), you must monitor continuously (or collect 

data at all required intervals) at all times that the affected 

source is operating. This includes periods of startup, shutdown, 

malfunction, and routine control device maintenance as specified 

in §63.8570(d) when the affected source is operating. 

(c) You may not use data recorded during monitoring 

malfunctions, associated repairs, out-of-control periods, or 

required quality assurance or control activities for purposes of 

calculating data averages. You must use all the valid data 

collected during all other periods in assessing compliance. Any 

averaging period for which you do not have valid monitoring data 
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and such data are required constitutes a deviation from the 

monitoring requirements. 

§63.8620 How do I demonstrate continuous compliance with the 

emission limitations and work practice standards? 

(a) You must demonstrate continuous compliance with each 

emission limit, operating limit, and work practice standard in 

Tables 1, 2, and 3 to this subpart that applies to you according 

to the methods specified in Table 7 to this subpart. 

(b) For each affected source that is subject to the 

emission limits specified in Table 1 to this subpart and is 

equipped with an APCD that is not addressed in Table 2 to this 

subpart, or that is using process changes as a means of meeting 

the emission limits in Table 1 to this subpart, you must 

demonstrate continuous compliance with each emission limit in 

Table 1 to this subpart, and each operating limit established as 

required in §63.8595(h)(2) according to the methods specified in 

your approved alternative monitoring procedures request, as 

described in §§63.8595(h)(1) and 63.8(f). 

(c) You must report each instance in which you did not meet 

each emission limit and operating limit in this subpart that 

applies to you. These instances are deviations from the emission 

limitations in this subpart. These deviations must be reported 

according to the requirements in §63.8635(c)(8). 
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(d) [Reserved] 

(e) You must demonstrate continuous compliance with the 

operating limits in Table 2 to this subpart for visible 

emissions (VE) from tunnel or roller kilns that are uncontrolled 

or equipped with DIFF, DLS/FF, or other dry control device by 

monitoring VE at each kiln stack according to the requirements 

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

(1) Perform daily VE observations of each kiln stack 

according to the procedures of Method 22 of 40 CFR part 60, 

appendix A-7. You must conduct the Method 22 test while the 

affected source is operating under normal conditions. The 

duration of each Method 22 test must be at least 15 minutes. 

(2) If VE are observed during any daily test conducted 

using Method 22 of 40 CFR part 60, appendix A-7, you must 

promptly initiate and complete corrective actions according to 

your OM&M plan. If no VE are observed in 30 consecutive daily 

Method 22 tests for any kiln stack, you may decrease the 

frequency of Method 22 testing from daily to weekly for that 

kiln stack. If VE are observed during any weekly test, you must 

promptly initiate and complete corrective actions according to 

your OM&M plan, resume Method 22 testing of that kiln stack on a 

daily basis, and maintain that schedule until no VE are observed 
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in 30 consecutive daily tests, at which time you may again 

decrease the frequency of Method 22 testing to a weekly basis. 

(3) If VE are observed during any test conducted using 

Method 22 of 40 CFR part 60, appendix A-7, you must report these 

deviations by following the requirements in §63.8635. 

Notifications, Reports, and Records 

§63.8630 What notifications must I submit and when? 

(a) You must submit all of the notifications in §§63.7(b) 

and (c), 63.8(f)(4), and 63.9 (b) through (e), (g)(1), and (h) 

that apply to you, by the dates specified. 

(b) You must submit all of the notifications specified in 

Table 9 to this subpart that apply to you, by the dates 

specified. 

(c) If you are required to conduct a performance test or 

other initial compliance demonstration as specified in Tables 4 

and 6 to this subpart, your Notification of Compliance Status as 

specified in Table 9 to this subpart must include the 

information in paragraphs (c)(1) through (3) of this section. 

(1) The requirements in §63.9(h)(2)(i). 

(2) The operating limit parameter values established for 

each affected source with supporting documentation and a 

description of the procedure used to establish the values. 
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(3) For each APCD that includes a fabric filter, if a bag 

leak detection system is used, analysis and supporting 

documentation demonstrating conformance with EPA guidance and 

specifications for bag leak detection systems in §63.8600(e). 

(d) If you own or operate an affected kiln that is subject 

to the work practice standard specified in Item 1 of Table 3 to 

this subpart, and you intend to use a fuel other than natural 

gas or equivalent to fire the affected kiln, your notification 

of alternative fuel use must include the information specified 

in paragraphs (d)(1) through (5) of this section. 

(1) Company name and address. 

(2) Identification of the affected kiln. 

(3) Reason you are unable to use natural gas or equivalent 

fuel, including the date when the natural gas curtailment was 

declared or the natural gas supply interruption began. 

(4) Type of alternative fuel that you intend to use. 

(5) Dates when the alternative fuel use is expected to 

begin and end. 

§63.8635 What reports must I submit and when? 

(a) You must submit each report in Table 10 to this subpart 

that applies to you. 

(b) Unless the Administrator has approved a different 

schedule for submission of reports under §63.10(a), you must 
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submit each report by the date in Table 10 to this subpart and 

as specified 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 §63.8545 and ending on either June 30 or 

December 31. This reporting period must be at least 6 months, 

but less than 12 months. For example, if your compliance date is 

March 1, then the first semiannual reporting period would begin 

on March 1 and end on December 31. 

(2) The first compliance report must be postmarked or 

delivered no later than July 31 or January 31 for compliance 

periods ending on June 30 and December 31, respectively. 

(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 for compliance 

periods ending on June 30 and December 31, respectively. 

(5) For each affected source that is subject to permitting 

regulations pursuant to 40 CFR part 70 or 40 CFR part 71, and if 

the permitting authority has established dates for submitting 

semiannual reports pursuant to 40 CFR 70.6(a)(3)(iii)(A) or 40 

CFR 71.6(a)(3)(iii)(A), you may submit the first and subsequent 
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compliance reports according to the dates the permitting 

authority has established instead of the dates in paragraphs 

(b)(1) through (4) of this section. 

(c) The compliance report must contain the information in 

paragraphs (c)(1) through (8) of this section. 

(1) Company name and address. 

(2) Statement by a responsible official with that 

official’s name, title, and signature, certifying that, based on 

information and belief formed after reasonable inquiry, the 

statements and information in the report are true, accurate, and 

complete. 

(3) Date of report and beginning and ending dates of the 

reporting period. 

(4) A description of control device maintenance performed 

while the control device was offline and the affected source 

controlled by the control device was operating, including the 

information specified in paragraphs (c)(4)(i) through (iii) of 

this section. 

(i) The date and time when the control device was shut down 

and restarted. 

(ii) Identification of the affected source that was 

operating and the number of hours that the affected source 

operated while the control device was offline. 
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(iii) A statement of whether or not the control device 

maintenance was included in your approved routine control device 

maintenance exemption developed as specified in §63.8570(d). If 

the control device maintenance was included in your approved 

routine control device maintenance exemption, then you must 

report the information in paragraphs (c)(4)(iii)(A) through (C) 

of this section. 

(A) The total amount of time that the affected source 

controlled by the control device operated during the current 

semiannual compliance period and during the previous semiannual 

compliance period. 

(B) The amount of time that each affected source controlled 

by the control device operated while the control device was 

offline for maintenance covered under the routine control device 

maintenance exemption during the current semiannual compliance 

period and during the previous semiannual compliance period. 

(C) Based on the information recorded under paragraphs 

(c)(4)(iii)(A) and (B) of this section, compute the annual 

percent of affected source operating uptime during which the 

control device was offline for routine maintenance using 

Equation 9. 

  100

p c

p c

SU +SU

DT +DT

RM= (Eq. 9) 
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Where: 

RM = Annual percentage of affected source uptime during which 

control device was offline for routine control device 

maintenance 

DTp = Control device downtime claimed under the routine control 

device maintenance exemption for the previous semiannual 

compliance period 

DTc = Control device downtime claimed under the routine control 

device maintenance exemption for the current semiannual 

compliance period 

SUp = Affected source uptime for the previous semiannual 

compliance period 

SUc = Affected source uptime for the current semiannual 

compliance period 

(5) If there are no deviations from any emission 

limitations (emission limits or operating limits) or work 

practice standards that apply to you, the compliance report must 

contain a statement that there were no deviations from the 

emission limitations or work practice standards during the 

reporting period. 

(6) If there were no periods during which the CMS was outof-control as specified in your OM&M plan, the compliance report 

must contain a statement that there were no periods during which 

the CMS was out-of-control during the reporting period. 

(7) The first compliance report must contain the startup 

production rate for each ceramic tile roller kiln, floor tile 

press dryer, ceramic tile spray dryer, and sanitaryware tunnel 
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kiln; the minimum APCD inlet temperature for each APCD; and the 

temperature profile for each ceramic tile roller kiln, floor 

tile press dryer, ceramic tile spray dryer, and sanitaryware 

tunnel kiln without an APCD. 

(8) For each deviation that occurs at an affected source, 

report such events in the compliance report by including the 

information in paragraphs (c)(8)(i) through (iii) of this 

section. 

(i) The date, time, and duration of the deviation. 

(ii) A list of the affected sources or equipment for which 

the deviation occurred. 

(iii) An estimate of the quantity of each regulated 

pollutant emitted over any emission limit, and a description of 

the method used to estimate the emissions. 

(d) For each deviation from an emission limitation 

(emission limit or operating limit) occurring at an affected 

source where you are using a CMS to comply with the emission 

limitations in this subpart, you must include the information in 

paragraphs (c)(1) through (4) and (c)(8),and paragraphs (d)(1) 

through (11) of this section. This includes periods of startup, 

shutdown, and routine control device maintenance. 

(1) The total operating time of each affected source during 

the reporting period. 
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(2) The date and time that each CMS was inoperative, except 

for zero (low-level) and high-level checks. 

(3) The date, time, and duration that each CMS was out-ofcontrol, including the pertinent information in your OM&M plan. 

(4) Whether each deviation occurred during routine control 

device maintenance covered in your approved routine control 

device maintenance exemption or during another period, and the 

cause of each deviation (including unknown cause, if 

applicable). 

(5) A description of any corrective action taken to return 

the affected unit to its normal or usual manner of operation. 

(6) A breakdown of the total duration of the deviations 

during the reporting period 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 CMS downtime during 

the reporting period and the total duration of CMS downtime as a 

percent of the total source operating time during that reporting 

period. 

(8) A brief description of the process units. 

(9) A brief description of the CMS. 

(10) The date of the latest CMS certification or audit. 
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(11) A description of any changes in CMS, processes, or 

control equipment since the last reporting period. 

(e) If you have obtained a title V operating permit 

according to 40 CFR part 70 or 40 CFR part 71, you must report 

all deviations as defined in this subpart in the semiannual 

monitoring report required by 40 CFR 70.6(a)(3)(iii)(A) or 40 

CFR 71.6(a)(3)(iii)(A). If you submit a compliance report 

according to Table 8 to this subpart along with, or as part of, 

the semiannual monitoring report required by 40 CFR 

70.6(a)(3)(iii)(A) or 40 CFR 71.6(a)(3)(iii)(A), and the 

compliance report includes all required information concerning 

deviations from any emission limitation (including any operating 

limit), then submitting the compliance report will satisfy any 

obligation to report the same deviations in the semiannual 

monitoring report. However, submitting a compliance report will 

not otherwise affect any obligation you may have to report 

deviations from permit requirements to the permitting authority. 

(f) If you own or operate an affected kiln that is subject 

to the work practice standard specified in Item 1 of Table 3 to 

this subpart, and you use a fuel other than natural gas or 

equivalent to fire the affected kiln, you must submit a report 

of alternative fuel use within 10 working days after terminating 
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the use of the alternative fuel. The report must include the 

information in paragraphs (f)(1) through (6) of this section. 

(1) Company name and address. 

(2) Identification of the affected kiln. 

(3) Reason for using the alternative fuel. 

(4) Type of alternative fuel used to fire the affected 

kiln. 

(5) Dates that the use of the alternative fuel started and 

ended. 

(6) Amount of alternative fuel used. 

(g) Within 60 calendar days after the date of completing 

each performance test (as defined in §63.2) required by this 

subpart, you must submit the results of the performance tests 

following the procedure specified in either paragraph (g)(1) or 

(g)(2) of this section. 

(1) For data collected using test methods supported by the 

EPA’s Electronic Reporting Tool (ERT) as listed on the EPA’s ERT 

Web site (http://www.epa.gov/ttn/chief/ert/index.html), you must 

submit the results of the performance test to the EPA via the 

Compliance and Emissions Data Reporting Interface (CEDRI). CEDRI 

can be accessed through the EPA’s Central Data Exchange (CDX) 

(http://cdx.epa.gov/epa_home.asp). Performance test data must be 

submitted in a file format generated through the use of the 
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EPA’s ERT. Alternatively, you may submit performance test data 

in an electronic file format consistent with the extensible 

markup language (XML) schema listed on the EPA’s ERT Web site 

once the XML schema is available. 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 or an alternate 

electronic file consistent with the XML schema listed on the 

EPA’s ERT Web site, including information claimed to be CBI, on 

a compact disc, flash drive, or other commonly used electronic 

storage media to the EPA. The electronic media must be clearly 

marked as CBI and mailed to U.S. EPA/OAPQS/CORE CBI Office, 

Attention: Group Leader, Measurement Policy Group, MD C404-02, 

4930 Old Page Rd., Durham, NC 27703. The same ERT or alternate 

file with the CBI omitted must be submitted to the EPA via the 

EPA’s CDX as described earlier in this paragraph. 

(2) For data collected using test methods that are not 

supported by the EPA’s ERT as listed on the EPA’s ERT Web site, 

you must submit the results of the performance test to the 

Administrator at the appropriate address listed in §63.13. 

§63.8640 What records must I keep? 

(a) You must keep the records listed in paragraphs (a)(1) 

through (3) of this section. 
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(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) Records of performance tests as required in 

§63.10(b)(2)(viii). 

(3) Records relating to control device maintenance and 

documentation of your approved routine control device 

maintenance exemption, if you request such an exemption under 

§63.8570(d). 

(b) You must keep the records required in Table 7 to this 

subpart to show continuous compliance with each emission 

limitation and work practice standard that applies to you. 

(c) You must also maintain the records listed in paragraphs 

(c)(1) through (10) of this section. 

(1) For each bag leak detection system, records of each 

alarm, the time of the alarm, the time corrective action was 

initiated and completed, and a brief description of the cause of 

the alarm and the corrective action taken. 

(2) For each deviation, record the information in 

paragraphs (c)(2)(i) through (iv) of this section. 

(i) The date, time, and duration of the deviation. 
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(ii) A list of the affected sources or equipment. 

(iii) An estimate of the quantity of each regulated 

pollutant emitted over any emission limit and a description of 

the method used to estimate the emissions. 

(iv) Actions taken to minimize emissions in accordance with 

§63.8570(b) and any corrective actions taken to return the 

affected unit to its normal or usual manner of operation. 

(3) For each affected source, records of production rates 

on a ton throughput processed basis. 

(4) Records for any approved alternative monitoring or test 

procedures. 

(5) Records of maintenance and inspections performed on the 

APCD. 

(6) Current copies of your OM&M plan, including any 

revisions, with records documenting conformance. 

(7) Logs of the information required in paragraphs 

(c)(7)(i) through (iii) of this section to document proper 

operation of your sanitaryware shuttle kiln. 

(i) Records of the firing time and temperature cycle for 

each sanitaryware shuttle kiln. If all shuttle kilns use the 

same time and temperature cycles, one copy may be maintained for 

each kiln. Reference numbers must be assigned to use in log 

sheets. 
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(ii) For each sanitaryware shuttle kiln, a log that details 

the time and temperature protocol reference number, and an 

indication of whether the appropriate time and temperature cycle 

was fired. 

(iii) For each sanitaryware shuttle kiln, a log of the 

actual tonnage of greenware fired in the shuttle kiln and an 

indication of whether the tonnage was below the maximum tonnage 

for that specific kiln. 

(8) Logs of the maintenance procedures used to demonstrate 

compliance with the maintenance requirements of the sanitaryware 

shuttle kiln work practice standards specified in Table 3 to 

this subpart. 

(9) For periods of startup and shutdown, records of the 

following information: 

(i) The date, time, and duration of each startup and/or 

shutdown period, recording the periods when the affected source 

was subject to the standard applicable to startup and shutdown. 

(ii) For periods of startup, the production rate and 

exhaust temperature prior to the time the exhaust reaches the 

minimum APCD inlet temperature (for ceramic tile roller kilns, 

floor tile press dryers, ceramic tile spray dryers, and 

sanitaryware tunnel kilns with an APCD) or the temperature 

profile is attained (for ceramic tile roller kilns, floor tile 
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press dryers, ceramic tile spray dryers, and sanitaryware tunnel 

kilns with no APCD). 

(iii) For periods of shutdown, the production rate and 

exhaust temperature after the time the exhaust falls below the 

minimum APCD inlet temperature (for ceramic tile roller kilns, 

floor tile press dryers, ceramic tile spray dryers, and 

sanitaryware tunnel kilns with an APCD) or the temperature 

profile is no longer maintained (for ceramic tile roller kilns, 

floor tile press dryers, ceramic tile spray dryers, and 

sanitaryware tunnel kilns with no APCD). 

(10) All site-specific parameters, temperature profiles, 

and procedures required to be established or developed according 

to the applicable work practice standards in Table 3 to this 

subpart. 

§63.8645 In what form and for how long must I keep my records? 

(a) Your records must be in a form suitable and readily 

available for expeditious review, according to §63.10(b)(1). 

(b) 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. 

(c) You must keep each record onsite for at least 2 years 

after the date of each occurrence, measurement, maintenance, 
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corrective action, report, or record, according to §63.10(b)(1). 

You may keep the records offsite for the remaining 3 years. 

Other Requirements and Information 

§63.8655 What parts of the General Provisions apply to me? 

Table 11 to this subpart shows which parts of the General 

Provisions in §§63.1 through 63.16 apply to you. 

§63.8660 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, in addition to the U.S. EPA, has the authority to 

implement and enforce this subpart. You should contact your U.S. 

EPA Regional Office to find out if implementation and 

enforcement of 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 

subpart E of this part, 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. 
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(c) The authorities that cannot be delegated to state, 

local, or tribal agencies are as specified in paragraphs (c)(1) 

through (6) of this section. 

(1) Approval of alternatives to the applicability 

requirements in §§63.8535 and 63.8540, the compliance date 

requirements in §63.8545, and the non-opacity emission 

limitations in §63.8555. 

(2) Approval of major changes to test methods under 

§63.7(e)(2)(ii) and (f) and as defined in §63.90. 

(3) Approval of major changes to monitoring under §63.8(f) 

and as defined in in §63.90. 

(4) Approval of major changes to recordkeeping and 

reporting under §63.10(f) and as defined in §63.90. 

(5) Approval of an alternative to any electronic reporting 

to the EPA required by this subpart. 

(6) Approval of a routine control device maintenance 

exemption under §63.8570(d). 

§63.8665 What definitions apply to this subpart? 

Terms used in this subpart are defined in the Clean Air 

Act, in §63.2, and in this section as follows: 

Air pollution control device (APCD) means any equipment 

that reduces the quantity of a pollutant that is emitted to the 

air. 
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Bag leak detection system means an instrument that is 

capable of monitoring PM loadings in the exhaust of a fabric 

filter in order to detect bag failures. A bag leak detection 

system includes, but is not limited to, an instrument that 

operates on triboelectric, light-scattering, lighttransmittance, or other effects to monitor relative PM loadings. 

Clay ceramics manufacturing facility means a plant site 

that manufactures pressed floor tile, pressed wall tile, other 

pressed tile, or sanitaryware (e.g., sinks and toilets). Clay 

ceramics manufacturing facilities typically process clay, shale, 

and various additives, form the processed materials into tile or 

sanitaryware shapes, and dry and fire the ceramic products. 

Glazes are applied to many tile and sanitaryware products. A 

plant site that manufactures refractory products, as defined in 

40 CFR 63.9824, or brick and structural clay products (BSCP), as 

defined in 40 CFR 63.8515, is not a clay ceramics manufacturing 

facility. 

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 
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limitation (including any 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 for any 

affected source required to obtain such a permit. 

Dioxin/furan means, for purposes of this subpart, the sum 

of the 2,3,7,8-TCDD toxic equivalents calculated using Equation 

3 of this subpart. 

Dry lime injection fabric filter (DIFF) means an APCD that 

includes continuous injection of hydrated lime or other sorbent 

into a duct or reaction chamber followed by a fabric filter. 

Dry lime scrubber/fabric filter (DLS/FF) means an APCD that 

includes continuous injection of humidified hydrated lime or 

other sorbent into a reaction chamber followed by a fabric 

filter. These systems typically include recirculation of some of 

the sorbent. 

Emission limitation means any emission limit or operating 

limit. 

Fabric filter means an APCD used to capture PM by filtering 

a gas stream through filter media; also known as a baghouse. 

Fired product means clay ceramic or sanitaryware products 

that have gone through the firing process via kilns. 
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Glaze means a coating of colored, opaque, or transparent 

material applied to ceramic products before firing. 

Glaze line means a production line for glazing ceramic 

products, which includes glaze spraying (typically comprised of 

one or more glaze spray booths) and other types of glazing 

operations (e.g., dipping, flooding, centrifugal disc glazing, 

curtain coating). 

Glaze spray booth means a type of equipment used for 

spraying glaze on ceramic products. 

Glaze spray operation means any type of glaze application 

that uses glaze spraying, including glaze lines and glaze spray 

booths. 

Greenware means clay ceramic or sanitaryware products that 

have not gone through the firing process via kilns. 

Initial startup means the time at which the kiln first 

reaches a level of production that is equal to 75 percent of the 

kiln design capacity or 12 months after the affected source 

begins firing clay ceramics, whichever is earlier. 

Kiln design capacity means the maximum amount of clay 

ceramics, in Mg (tons), that a kiln is designed to produce in 

one year divided by the number of hours in a year (8,760 hours), 

taking into account the void space in the product, the push rate 

for the kiln, and the stacking pattern, if applicable. If a kiln 
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is modified to increase the capacity, the design capacity is 

considered to be the capacity following modifications. 

Minimum APCD inlet temperature means the minimum 

temperature that kiln exhaust can be vented to the APCD that 

ensures the long-term integrity of the APCD. 

Particulate matter (PM) means, for purposes of this 

subpart, emissions of filterable PM that serve as a measure of 

total particulate emissions, as measured by Method 5 (40 CFR 

part 60, appendix A-3) or Method 29 (40 CFR part 60, appendix A8), and as a surrogate for non-mercury metal HAP contained in 

the particulates including, but not limited to, antimony, 

arsenic, beryllium, cadmium, chromium, cobalt, lead, manganese, 

nickel, and selenium. 

Period of natural gas curtailment or supply interruption 

means a period of time during which the supply of natural gas to 

an affected facility is halted for reasons beyond the control of 

the facility. An increase in the cost or unit price of natural 

gas does not constitute a period of natural gas curtailment or 

supply interruption. 

Plant site means all contiguous or adjoining property that 

is under common control, including properties that are separated 

only by a road or other public right-of-way. Common control 

includes properties that are owned, leased, or operated by the 
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same entity, parent entity, subsidiary, or any combination 

thereof. 

Responsible official means responsible official as defined 

in 40 CFR 70.2. 

Roller kiln means a continuous kiln similar to a tunnel 

kiln except that the unfired ceramic product travels through the 

kiln in a single layer on rollers. In the clay ceramics source 

category, roller kilns are used at ceramic tile manufacturing 

plants. 

Shuttle kiln means a batch firing kiln that is designed 

with a removable superstructure that is tilted or raised using 

hydraulic struts to allow entrance and egress. In the clay 

ceramics source category, shuttle kilns are used at sanitaryware 

manufacturing plants. 

Spray dryer means a drying chamber used to form a freeflowing powder from a slurry of ceramic mix and water, to 

improve handling and compaction. In the clay ceramics source 

category, spray dryers are used at ceramic tile manufacturing 

plants. 

Startup means the setting in operation of an affected 

source and starting the production process. 
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Startup production rate means the kiln, press dryer or 

spray dryer production rate required to bring the process unit 

to the proper operating temperature during startup. 

Tunnel kiln means any continuous kiln that is not a roller 

kiln that is used to fire clay ceramics. In the clay ceramics 

source category, tunnel kilns are used at sanitaryware 

manufacturing plants. 

Wet scrubber (WS) means an APCD that uses water, which may 

include caustic additives or other chemicals, as the sorbent. 

Wet scrubbers may use any of various design mechanisms to 

increase the contact between exhaust gases and the sorbent. 

Work practice standard means any design, equipment, work 

practice, operational standard, or combination thereof, that is 

promulgated pursuant to section 112(h) of the Clean Air Act. 

Tables to Subpart KKKKK of Part 63 

As stated in §63.8555, you must meet each emission limit in 

the following table that applies to you: 

Table 1 to Subpart KKKKK of Part 63--Emission Limits 

For each... You must meet the following emission limits... 

1. Collection of all 

tunnel or roller 

kilns at facility 

HF and HCl emissions must not exceed 62 kilograms per 

hour (kg/hr) (140 pounds per hour (lb/hr)) HCl 

equivalent, under the health-based standard, as 

determined using Equations 4 and 5. 

2. Existing floor 

tile roller kiln. 

a. PM emissions must not exceed 0.063 kilogram per 

megagram (kg/Mg) (0.13 pound per ton (lb/ton)) of 

fired product. 

b. Hg emissions must not exceed 6.3 E-05 kg/Mg (1.3 

E-04 lb/ton) of fired product. 
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c. Dioxin/furan emissions must not exceed 2.8 

nanograms per kilogram (ng/kg) of fired product. 

3. Existing wall 

tile roller kiln 

a. PM emissions must not exceed 0.19 kg/Mg 

(0.37 lb/ton) of fired product. 

b. Hg emissions must not exceed 1.1 E-04 kg/Mg (2.1 

E-04 lb/ton) of fired product. 

c. Dioxin/furan emissions must not exceed 0.22 ng/kg 

of fired product. 

4. Existing firstfire sanitaryware 

tunnel kiln 

a. PM emissions must not exceed 0.17 kg/Mg 

(0.34 lb/ton) of greenware fired. 

 b. Hg emissions must not exceed 1.3 E-04 kg/Mg (2.6 

E-04 lb/ton) of greenware fired. 

 c. Dioxin/furan emissions must not exceed 3.3 ng/kg 

of greenware fired. 

5. Existing tile 

glaze line with 

glaze spraying 

a. PM emissions must not exceed 0.93 kg/Mg 

(1.9 lb/ton) of first-fire glaze sprayed (dry weight 

basis). 

 b. Hg emissions must not exceed 8.0 E-05 kg/Mg (1.6 

E-04 lb/ton) of first-fire glaze sprayed (dry weight 

basis). 

6. Existing 

sanitaryware manual 

glaze application 

PM emissions must not exceed 18 kg/Mg (35 lb/ton) of 

first-fire glaze sprayed (dry weight basis). 

7. Existing 

sanitaryware spray 

machine glaze 

application 

PM emissions must not exceed 6.2 kg/Mg (13 lb/ton) of 

first-fire glaze sprayed (dry weight basis). 

8. Existing 

sanitaryware robot 

glaze application 

PM emissions must not exceed 4.5 kg/Mg (8.9 lb/ton) 

of first-fire glaze sprayed (dry weight basis). 

9. Existing floor 

tile spray dryer 

Dioxin/furan emissions must not exceed 19 ng/kg of 

throughput processed. 

10. Existing wall 

tile spray dryer 

Dioxin/furan emissions must not exceed 0.058 ng/kg of 

throughput processed. 

11. Existing floor 

tile press dryer 

Dioxin/furan emissions must not exceed 0.024 ng/kg of 

throughput processed. 

12. New or 

reconstructed floor 

tile roller kiln 

a. PM emissions must not exceed 0.019 kg/Mg 

(0.037 lb/ton) of fired product. 

b. Hg emissions must not exceed 2.0 E-05 kg/Mg (3.9 

E-05 lb/ton) of fired product. 

c. Dioxin/furan emissions must not exceed 1.3 ng/kg 

of fired product. 

13. New or 

reconstructed wall 

tile roller kiln 

a. PM emissions must not exceed 0.19 kg/Mg 

(0.37 lb/ton) of fired product. 

b. Hg emissions must not exceed 1.1 E-04 kg/Mg (2.1 

E-04 lb/ton) of fired product. 
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c. Dioxin/furan emissions must not exceed 0.22 ng/kg 

of fired product. 

14. New or 

reconstructed firstfire sanitaryware 

tunnel kiln 

a. PM emissions must not exceed 0.048 kg/Mg 

(0.095 lb/ton) of greenware fired. 

b. Hg emissions must not exceed 6.1 E-05 kg/Mg (1.3 

E-04 lb/ton) of greenware fired. 

c. Dioxin/furan emissions must not exceed 0.99 ng/kg 

of greenware fired. 

15. New or 

reconstructed tile 

glaze line with 

glaze spraying 

a. PM emissions must not exceed 0.31 kg/Mg 

(0.61 lb/ton) of first-fire glaze sprayed (dry weight 

basis). 

 b. Hg emissions must not exceed 6.1 E-05 kg/Mg (1.3 

E-04 lb/ton) of first-fire glaze sprayed (dry weight 

basis). 

16. New or 

reconstructed 

sanitaryware manual 

glaze application 

PM emissions must not exceed 2.0 kg/Mg (3.9 lb/ton) 

of first-fire glaze sprayed (dry weight basis). 

17. New or 

reconstructed 

sanitaryware spray 

machine glaze 

application 

PM emissions must not exceed 1.6 kg/Mg (3.2 lb/ton) 

of first-fire glaze sprayed (dry weight basis). 

18. New or 

reconstructed 

sanitaryware robot 

glaze application 

PM emissions must not exceed 1.2 kg/Mg (2.4 lb/ton) 

of first-fire glaze sprayed (dry weight basis). 

19. New or 

reconstructed floor 

tile spray dryer 

Dioxin/furan emissions must not exceed 0.071 ng/kg of 

throughput processed. 

20. New or 

reconstructed wall 

tile spray dryer 

Dioxin/furan emissions must not exceed 0.058 ng/kg of 

throughput processed. 

21. New or 

reconstructed floor 

tile press dryer 

Dioxin/furan emissions must not exceed 0.024 ng/kg of 

throughput processed. 

As stated in §63.8555, you must meet each operating limit 

in the following table that applies to you: 

Table 2 to Subpart KKKKK of Part 63--Operating Limits 
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For each... You must... 

1. Tunnel or 

roller kiln 

equipped with 

a DIFF or 

DLS/FF. 

a. If you use a bag leak detection system, initiate 

corrective action within 1 hour of a bag leak detection 

system alarm and complete corrective actions in accordance 

with your OM&M plan; operate and maintain the fabric filter 

such that the alarm is not engaged for more than 5 percent of 

the total operating time in a 6-month block reporting period; 

or maintain no VE from the DIFF or DLS/FF stack; and 

 b. Maintain free-flowing lime in the feed hopper or silo and 

to the APCD at all times for continuous injection systems; 

maintain the feeder setting (on a per ton of throughput 

basis) at or above the level established during the 

performance test for continuous injection systems. 

2. Tunnel or 

roller kiln 

equipped with 

a WS. 

a. Maintain the average scrubber pressure drop for each 3-

hour block period at or above the average pressure drop 

established during the PM performance test; and 

 b. Maintain the average scrubber liquid pH for each 3-hour 

block period at or above the average scrubber liquid pH 

established during the HF/HCl performance test; and 

 c. Maintain the average scrubber liquid flow rate for each 3-

hour block period at or above the highest average scrubber 

liquid flow rate established during the HF/HCl and PM 

performance tests; and 

 d. If chemicals are added to the scrubber water, maintain the 

average scrubber chemical feed rate for each 3-hour block 

period at or above the average scrubber chemical feed rate 

established during the HF/HCl performance test. 

3. Tunnel or 

roller kiln 

equipped with 

an ACI 

system. 

Maintain the average carbon flow rate for each 3-hour block 

period at or above the highest average carbon flow rate 

established during the Hg and dioxin/furan performance tests. 

4. Tunnel or 

roller kiln 

intending to 

comply with 

dioxin/furan 

emission 

limit without 

an ACI 

system. 

If you intend to comply with the dioxin/furan emission limit 

without an ACI system, maintain the average kiln peak 

temperature for each 3-hour block period at or above the 

average kiln peak temperature established during the 

dioxin/furan performance test; an average kiln peak 

temperature variation of -10% or less is allowed, as long as 

the temperature does not fall below 1,850 °F. 

5. Tunnel or 

roller kiln 

with no addon control. 

a. Maintain no VE from the stack; and 
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 b. Maintain the kiln process rate at or below the kiln 

process rate determined according to §63.8595(g)(1) if your 

total facility maximum potential HCl-equivalent emissions are 

greater than the HCl-equivalent limit in Table 1 to this 

subpart; and 

 c. Maintain the average kiln peak temperature for each 3-hour 

block period at or above the average kiln peak temperature 

established during the dioxin/furan performance test; an 

average kiln peak temperature variation of -10% or less is 

allowed, as long as the temperature does not fall below 1,850 

°F. 

6. Glaze 

spray 

operation 

equipped with 

a FF. 

If you use a bag leak detection system, initiate corrective 

action within 1 hour of a bag leak detection system alarm and 

complete corrective actions in accordance with your OM&M 

plan; operate and maintain the fabric filter such that the 

alarm is not engaged for more than 5 percent of the total 

operating time in a 6-month block reporting period; or 

maintain no VE from the FF stack; and 

7. Glaze 

spray 

operation 

equipped with 

a WS. 

a. Maintain the average scrubber pressure drop for each 3-

hour block period at or above the average pressure drop 

established during the PM performance test; and 

b. Maintain the average scrubber liquid flow rate for each 3-

hour block period at or above the average scrubber liquid 

flow rate established during the PM performance test. 

8. Glaze 

spray 

operation 

equipped with 

a water 

curtain. 

Conduct daily inspections to verify the presence of water 

flow to the wet control system; and 

Conduct weekly visual inspections of the system ductwork and 

control equipment for leaks; and 

Conduct annual inspections of the interior of the control 

equipment (if applicable) to determine the structural 

integrity and condition of the control equipment. 

9. Glaze 

spray 

operation 

equipped with 

baffles. 

Conduct an annual visual inspection of the baffles to confirm 

the baffles are in place. 

10. Spray 

dryer. 

Maintain the average operating temperature for each 3-hour 

block period at or above the average temperature established 

during the dioxin/furan performance test. 

11. Floor 

tile press 

dryer. 

Maintain the average operating temperature for each 3-hour 

block period at or below the average temperature established 

during the dioxin/furan performance test. 

As stated in §63.8555, you must comply with each work 

practice standard in the following table that applies to you: 

Table 3 to Subpart KKKKK of Part 63--Work Practice Standards 
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For each... You must... 

According to one of the following 

requirements... 

1. Existing, 

new, or 

reconstructed 

sanitaryware 

shuttle kiln. 

a. Minimize 

HAP 

emissions. 

i. Use natural gas, or equivalent, as the 

kiln fuel, except during periods of 

natural gas curtailment or supply 

interruption, as defined in §63.8665; and 

 ii. Develop and use a designed firing time 

and temperature cycle for each 

sanitaryware shuttle kiln. You must either 

program the time and temperature cycle 

into your kiln or track each step on a log 

sheet; and 

 iii. Label each sanitaryware shuttle kiln 

with the maximum load (in tons) of 

greenware that can be fired in the kiln 

during a single firing cycle; and 

 iv. For each firing load, document the 

total tonnage of greenware placed in the 

kiln to ensure that it is not greater than 

the maximum load identified in item 

1.a.iii; and 

 v. Develop and follow maintenance 

procedures for each kiln that, at a 

minimum, specify the frequency of 

inspection and maintenance of temperature 

monitoring devices, controls that regulate 

air-to-fuel ratios, and controls that 

regulate firing cycles; and 

 vi. Develop and maintain records for each 

sanitaryware shuttle kiln, as specified in 

§63.8640. 

2. Existing, new 

or reconstructed 

ceramic tile 

roller kiln, 

sanitaryware 

tunnel kiln, 

floor tile press 

dryer or ceramic 

tile spray dryer 

during periods 

of startup 

a. Minimize 

HAP 

emissions. 

i. Establish the startup production rate 

for each kiln or dryer; the minimum APCD 

inlet temperature for each APCD; and 

temperature profile for each kiln or 

dryer with no APCD and include them in 

your first compliance report, as specified 

in §63.8635(c)(7); and 

 ii. After initial loading of the kiln or 

dryer, remain at or below the startup 

production rate for the kiln or dryer 

until the kiln or dryer exhaust reaches 

the minimum APCD inlet temperature for a 

kiln or dryer with an APCD or until the 

kiln or dryer temperature profile is 
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attained for a kiln or dryer with no APCD; 

and 

 iii. If your kiln or dryer has an APCD, 

begin venting the exhaust from the kiln or 

dryer through the APCD by the time the 

kiln or dryer exhaust temperature reaches 

the minimum APCD inlet temperature. 

3. Existing, new 

or reconstructed 

ceramic tile 

roller kiln, 

sanitaryware 

tunnel kiln, 

floor tile press 

dryer or ceramic 

tile spray dryer 

during periods 

of shutdown 

a. Minimize 

HAP 

emissions. 

i. Do not load the kiln or dryer once the 

kiln or dryer exhaust temperature falls 

below the minimum APCD inlet temperature 

if the kiln or dryer is controlled by an 

APCD or when the kiln or dryer temperature 

profile is no longer maintained for an 

uncontrolled kiln or dryer; and 

 ii. If your kiln or dryer has an APCD, 

continue to vent the exhaust from the kiln 

or dryer through the APCD until the kiln 

or dryer exhaust temperature falls below 

the minimum inlet temperature for the 

APCD. 

4. Existing, new 

or reconstructed 

ceramic tile 

roller kiln, 

sanitaryware 

tunnel kiln, 

floor tile press 

dryer or ceramic 

tile spray dryer 

during periods 

of routine 

control device 

maintenance 

a. Minimize 

HAP 

emissions. 

i. Develop and use a temperature profile 

for each kiln or dryer; and 

 ii. Develop and follow maintenance 

procedures for each kiln that, at a 

minimum, specify the frequency of 

inspection and maintenance of temperature 

monitoring devices and controls that 

regulate air-to-fuel ratios; and 

 iii. Develop and maintain records for each 

kiln or dryer, as specified in 

§63.8640(a)(3). 

As stated in §63.8595, you must conduct each performance 

test in the following table that applies to you: 
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Table 4 to Subpart KKKKK of Part 63--Requirements for 

Performance Tests 

For each... You must... Using... 

According to the 

following 

requirements... 

1. Tunnel or 

roller kiln. 

a. Select 

locations of 

sampling ports 

and the number of 

traverse points. 

Method 1 or 1A 

of 40 CFR part 

60, appendix A1. 

Sampling sites must be 

located at the outlet 

of the APCD and prior 

to any releases to the 

atmosphere for all 

affected sources. 

 b. Determine 

velocities and 

volumetric flow 

rate. 

Method 2 of 40 

CFR part 60, 

appendix A-1. 

You may use Method 2A, 

2C, 2D, or 2F of 40 CFR 

part 60, appendix A-1, 

or Method 2G of 40 CFR 

part 60, appendix A-2, 

as appropriate, as an 

alternative to using 

Method 2 of 40 CFR part 

60, appendix A-1. 

 c. Conduct gas 

molecular weight 

analysis. 

Method 3 of 40 

CFR part 60, 

appendix A-2. 

You may use Method 3A 

or 3B of 40 CFR part 

60, appendix A-2, as 

appropriate, as an 

alternative to using 

Method 3 of 40 CFR part 

60, appendix A-2. 

ANSI/ASME PTC 19.10-

1981 [Part 10] 

(incorporated by 

reference, see §63.14) 

may be used as an 

alternative to the 

manual procedures (but 

not the instrumental 

procedures) in Methods 

3A and 3B. 

 d. Measure 

moisture content 

of the stack gas. 

Method 4 of 40 

CFR part 60, 

appendix A-3. 
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 e. Measure HF and 

HCl emissions. 

i. Method 26A of 

40 CFR part 60, 

appendix A-8; or 

You may use Method 26 

of 40 CFR part 60, 

appendix A-8, as an 

alternative to using 

Method 26A of 40 CFR 

part 60, appendix A-8, 

when no acid PM (e.g., 

HF or HCl dissolved in 

water droplets emitted 

by sources controlled 

by a WS) is present. 

ASTM D6735-01 

(Reapproved 2009) 

(incorporated by 

reference, see §63.14) 

may be used as an 

alternative to Methods 

26 and 26A. 

 ii. Method 320 

of appendix A of 

this part. 

When using Method 320 

of appendix A of this 

part, you must follow 

the analyte spiking 

procedures of section 

13 of Method 320 of 

appendix A of this 

part, unless you can 

demonstrate that the 

complete spiking 

procedure has been 

conducted at a similar 

source. ASTM D6348-03 

(Reapproved 2010) 

(incorporated by 

reference, see §63.14) 

may be used as an 

alternative to Method 

320 if the test plan 

preparation and 

implementation in 

Annexes A1-A8 are 

mandatory and the %R in 

Annex A5 is determined 

for each target 

analyte. 

f. Measure PM 

emissions. 

i. Method 5 of 

40 CFR part 60, 

appendix A-3; or 

ii. Method 29 of 

40 CFR part 60, 

appendix A-8. 
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g. Measure Hg 

emissions. 

Method 29 of 40 

CFR part 60, 

appendix A-8. 

ASTM D6784-02 

(Reapproved 2008) 

(incorporated by 

reference, see §63.14) 

may be used as an 

alternative to Method 

29 (portion for Hg 

only). 

h. Measure 

dioxin/furan 

emissions. 

Method 23 of 40 

CFR part 60, 

appendix A-7. 

2. Glaze 

spray 

operation 

a. Select 

locations of 

sampling ports 

and the number of 

traverse points. 

Method 1 or 1A 

of 40 CFR part 

60, appendix A1. 

Sampling sites must be 

located at the outlet 

of the APCD and prior 

to any releases to the 

atmosphere for all 

affected sources. 

 b. Determine 

velocities and 

volumetric flow 

rate. 

Method 2 of 40 

CFR part 60, 

appendix A-1. 

You may use Method 2A, 

2C, 2D, or 2F of 40 CFR 

part 60, appendix A-1, 

or Method 2G of 40 CFR 

part 60, appendix A-2, 

as appropriate, as an 

alternative to using 

Method 2 of 40 CFR part 

60, appendix A-1. 

 c. Conduct gas 

molecular weight 

analysis. 

Method 3 of 40 

CFR part 60, 

appendix A-2. 

You may use Method 3A 

or 3B of 40 CFR part 

60, appendix A-2, as 

appropriate, as an 

alternative to using 

Method 3 of 40 CFR part 

60, appendix A-2. 

ANSI/ASME PTC 19.10-

1981 [Part 10] 

(incorporated by 

reference, see §63.14) 

may be used as an 

alternative to the 

manual procedures (but 

not the instrumental 

procedures) in Methods 

3A and 3B. 

 d. Measure 

moisture content 

of the stack gas. 

Method 4 of 40 

CFR part 60, 

appendix A-3. 

 e. Measure PM 

emissions. 

Method 5 of 40 

CFR part 60, 

appendix A-3. 
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 f. Measure Hg 

emissions (tile 

glaze spray 

operations only). 

Method 29 of 40 

CFR part 60, 

appendix A-8. 

ASTM D6784-02 

(Reapproved 2008) 

(incorporated by 

reference, see §63.14) 

may be used as an 

alternative to Method 

29 (portion for Hg 

only). 

3. Spray 

dryer or 

floor tile 

press dryer 

a. Select 

locations of 

sampling ports 

and the number of 

traverse points. 

Method 1 or 1A 

of 40 CFR part 

60, appendix A1. 

Sampling sites must be 

located at the outlet 

of the APCD and prior 

to any releases to the 

atmosphere for all 

affected sources. 

 b. Determine 

velocities and 

volumetric flow 

rate. 

Method 2 of 40 

CFR part 60, 

appendix A-1. 

You may use Method 2A, 

2C, 2D, or 2F of 40 CFR 

part 60, appendix A-1, 

or Method 2G of 40 CFR 

part 60, appendix A-2, 

as appropriate, as an 

alternative to using 

Method 2 of 40 CFR part 

60, appendix A-1. 

 c. Conduct gas 

molecular weight 

analysis. 

Method 3 of 40 

CFR part 60, 

appendix A-2. 

You may use Method 3A 

or 3B of 40 CFR part 

60, appendix A-2, as 

appropriate, as an 

alternative to using 

Method 3 of 40 CFR part 

60, appendix A-2. 

ANSI/ASME PTC 19.10-

1981 [Part 10] 

(incorporated by 

reference, see §63.14) 

may be used as an 

alternative to the 

manual procedures (but 

not the instrumental 

procedures) in Methods 

3A and 3B. 

 d. Measure 

moisture content 

of the stack gas. 

Method 4 of 40 

CFR part 60, 

appendix A-3. 

 e. Measure 

dioxin/furan 

emissions. 

Method 23 of 40 

CFR part 60, 

appendix A-7. 
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4. Tunnel or 

roller kiln 

with no addon control. 

a. Establish the 

operating 

limit(s) for kiln 

process rate if 

the total 

facility maximum 

potential HClequivalent 

emissions are 

greater than the 

HCl-equivalent 

limit in Table 1 

to this subpart. 

HCl-equivalent 

limit in Table 1 

to this subpart 

and emissions 

and production 

data from the 

HF/HCl/Cl2

performance 

test. 

Using the procedures in 

§63.8595(g)(1), you 

must determine the 

maximum process rate(s) 

for your kiln(s) that 

would ensure total 

facility maximum 

potential HClequivalent emissions 

remain at or below the 

HCl-equivalent limit in 

Table 1 to this 

subpart. The maximum 

process rate(s) would 

become your sitespecific process rate 

operating limit(s). 

 b. Establish the 

operating limit 

for kiln peak 

temperature. 

Data from the 

temperature 

measurement 

device during 

the dioxin/furan 

performance 

test. 

You must continuously 

measure the kiln peak 

temperature, determine 

and record the block 

average temperature 

values for the three 

test runs, and 

determine and record 

the 3-hour block 

average of the recorded 

temperature 

measurements for the 

three test runs. The 

average of the three 

test runs establishes 

your minimum sitespecific operating 

limit. 

5. Tunnel or 

roller kiln 

that is 

complying 

with PM 

and/or Hg 

productionbased 

emission 

limits. 

Determine the 

production rate 

during each PM/Hg 

test run in order 

to determine 

compliance with 

PM and/or Hg 

production-based 

emission limits. 

Production data 

collected during 

the PM/Hg 

performance 

tests (e.g., the 

number of 

ceramic pieces 

and weight per 

piece in the 

kiln during a 

test run divided 

by the amount of 

time to fire a 

piece). 

You must measure and 

record the production 

rate, on a ton of 

throughput processed 

basis, of the affected 

kiln for each of the 

three test runs. 
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6. Tunnel or 

roller kiln 

equipped 

with a DIFF 

or DLS/FF. 

Establish the 

operating limit 

for the lime 

feeder setting. 

Data from the 

lime feeder 

during the 

HF/HCl 

performance 

test. 

For continuous lime 

injection systems, you 

must ensure that lime 

in the feed hopper or 

silo and to the APCD is 

free-flowing at all 

times during the 

performance test and 

record the feeder 

setting, on a per ton 

of throughput basis, 

for the three test 

runs. If the feed rate 

setting varies during 

the three test runs, 

determine and record 

the average feed rate 

from the three test 

runs. The average of 

the three test runs 

establishes your 

minimum site-specific 

feed rate operating 

limit. 

7. Tunnel or 

roller kiln 

equipped 

with a WS. 

a. Establish the 

operating limit 

for the average 

scrubber pressure 

drop. 

Data from the 

pressure drop 

measurement 

device during 

the PM 

performance 

test. 

You must continuously 

measure the scrubber 

pressure drop, 

determine and record 

the block average 

pressure drop values 

for the three test 

runs, and determine and 

record the 3-hour block 

average of the recorded 

pressure drop 

measurements for the 

three test runs. The 

average of the three 

test runs establishes 

your minimum sitespecific pressure drop 

operating limit. 
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 b. Establish the 

operating limit 

for the average 

scrubber liquid 

pH. 

Data from the pH 

measurement 

device during 

the HF/HCl 

performance 

test. 

You must continuously 

measure the scrubber 

liquid pH, determine 

and record the block 

average pH values for 

the three test runs, 

and determine and 

record the 3-hour block 

average of the recorded 

pH measurements for the 

three test runs. The 

average of the three 

test runs establishes 

your minimum sitespecific liquid pH 

operating limit. 

 c. Establish the 

operating limit 

for the average 

scrubber liquid 

flow rate. 

Data from the 

flow rate 

measurement 

device during 

the HF/HCl and 

PM performance 

tests. 

You must continuously 

measure the scrubber 

liquid flow rate, 

determine and record 

the block average flow 

rate values for the 

three test runs, and 

determine and record 

the 3-hour block 

average of the recorded 

flow rate measurements 

for the three test 

runs. The average of 

the three test runs 

establishes your 

minimum site-specific 

liquid flow rate 

operating level. If 

different average wet 

scrubber liquid flow 

rate values are 

measured during the 

HF/HCl and PM tests, 

the highest of the 

average values become 

your site-specific 

operating limit. 
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8. Tunnel or 

roller kiln 

equipped 

with a WS 

that 

includes 

chemical 

addition to 

the water. 

Establish the 

operating limit 

for the average 

scrubber chemical 

feed rate. 

Data from the 

chemical feed 

rate measurement 

device during 

the HF/HCl 

performance 

test. 

You must continuously 

measure the scrubber 

chemical feed rate, 

determine and record 

the block average 

chemical feed rate 

values for the three 

test runs, and 

determine and record 

the 3-hour block 

average of the recorded 

chemical feed rate 

measurements for the 

three test runs. The 

average of the three 

test runs establishes 

your minimum sitespecific chemical 

addition rate operating 

limit. 

9. Tunnel or 

roller kiln 

equipped 

with an ACI 

system 

Establish the 

operating limit 

for the average 

carbon flow rate. 

Data from the 

carbon flow rate 

measurement 

conducted during 

the Hg 

performance 

test. 

You must measure the 

carbon flow rate during 

each test run, 

determine and record 

the block average 

carbon flow rate values 

for the three test 

runs, and determine and 

record the 3-hour block 

average of the recorded 

carbon flow rate 

measurements for the 

three test runs. The 

average of the three 

test runs establishes 

your minimum sitespecific activated 

carbon flow rate 

operating limit. 
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10. Tunnel 

or roller 

kiln 

intending to 

comply with 

dioxin/furan 

emission 

limit 

without an 

ACI system. 

Establish the 

operating limit 

for kiln peak 

temperature. 

Data from the 

temperature 

measurement 

device during 

the dioxin/furan 

performance 

test. 

You must continuously 

measure the kiln peak 

temperature, determine 

and record the block 

average temperature 

values for the three 

test runs, and 

determine and record 

the 3-hour block 

average of the recorded 

temperature 

measurements for the 

three test runs. The 

average of the three 

test runs establishes 

your minimum sitespecific operating 

limit. 

11. Glaze 

spray 

operation 

equipped 

with a WS. 

a. Establish the 

operating limit 

for the average 

scrubber pressure 

drop. 

Data from the 

pressure drop 

measurement 

device during 

the PM 

performance 

test. 

You must continuously 

measure the scrubber 

pressure drop, 

determine and record 

the block average 

pressure drop values 

for the three test 

runs, and determine and 

record the 3-hour block 

average of the recorded 

pressure drop 

measurements for the 

three test runs. The 

average of the three 

test runs establishes 

your minimum sitespecific pressure drop 

operating limit. 

 b. Establish the 

operating limit 

for the average 

scrubber liquid 

flow rate. 

Data from the 

flow rate 

measurement 

device during 

the PM 

performance 

test. 

You must continuously 

measure the scrubber 

liquid flow rate, 

determine and record 

the block average flow 

rate values for the 

three test runs, and 

determine and record 

the 3-hour block 

average of the recorded 

flow rate measurements 

for the three test 

runs. The average of 

the three test runs 

establishes your 

minimum site-specific 

liquid flow rate 

operating limit. 
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12. Spray 

dryer. 

Establish the 

operating limit 

for operating 

temperature. 

Data from the 

temperature 

measurement 

device during 

the dioxin/furan 

performance 

test. 

You must continuously 

measure the operating 

temperature, determine 

and record the block 

average temperature 

values for the three 

test runs, and 

determine and record 

the 3-hour block 

average of the recorded 

temperature 

measurements for the 

three test runs. The 

average of the three 

test runs establishes 

your minimum sitespecific operating 

limit. 

13. Floor 

tile press 

dryer. 

Establish the 

operating limit 

for operating 

temperature. 

Data from the 

temperature 

measurement 

device during 

the dioxin/furan 

performance 

test. 

You must continuously 

measure the operating 

temperature, determine 

and record the block 

average temperature 

values for the three 

test runs, and 

determine and record 

the 3-hour block 

average of the recorded 

temperature 

measurements for the 

three test runs. The 

average of the three 

test runs establishes 

your maximum sitespecific operating 

limit. 

As stated in §63.8595(f)(3), you must demonstrate initial 

compliance with each dioxin/furan emission limit that applies to 

you by calculating the sum of the 2,3,7,8-TCDD TEQs using the 

TEFs in the following table: 

Table 5 to Subpart KKKKK of Part 63—Toxic Equivalency Factors 
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For each dioxin/furan congener... 

You must calculate its 

2,3,7,8-TCDD TEQ using the 

following TEF... 

2,3,7,8-tetrachlorodibenzo-p-dioxin 1 

1,2,3,7,8-pentachlorodibenzo-p-dioxin 1 

1,2,3,4,7,8-hexachlorodibenzo-p-dioxin 0.1 

1,2,3,7,8,9-hexachlorodibenzo-p-dioxin 0.1 

1,2,3,6,7,8-hexachlorodibenzo-p-dioxin 0.1 

1,2,3,4,6,7,8-heptachlorodibenzo-p-dioxin 0.01 

Octachlorodibenzo-p-dioxin 0.0003 

2,3,7,8-tetrachlorodibenzofuran 0.1 

1,2,3,7,8-pentachlorodibenzofuran 0.03 

2,3,4,7,8-pentachlorodibenzofuran 0.3 

1,2,3,4,7,8-hexachlorodibenzofuran 0.1 

1,2,3,6,7,8-hexachlorodibenzofuran 0.1 

1,2,3,7,8,9-hexachlorodibenzofuran 0.1 

2,3,4,6,7,8-hexachlorodibenzofuran 0.1 

1,2,3,4,6,7,8-heptachlorodibenzofuran 0.01 

1,2,3,4,7,8,9-heptachlorodibenzofuran 0.01 

Octachlorodibenzofuran 0.0003 

As stated in §63.8605, you must demonstrate initial 

compliance with each emission limitation and work practice 

standard that applies to you according to the following table: 

Table 6 to Subpart KKKKK of Part 63--Initial Compliance with 

Emission Limitations and Work Practice Standards 

For each... 

For the 

following... 

You have demonstrated initial compliance 

if... 

1. Collection 

of all tunnel 

or roller 

kilns at the 

facility. 

a. HF, HCl, and 

Cl2 emissions 

must not exceed 

62 kg/hr (140 

lb/hr) HCl 

equivalent. 

i. You measure HF and HCl emissions for 

each kiln using Method 26 or 26A of 40 

CFR part 60, appendix A-8 or its 

alternative, ASTM D6735-01 (Reapproved 

2009) (incorporated by reference, see 

§63.14); or Method 320 of appendix A of 

this part or its alternative, ASTM D6348-

03 (Reapproved 2010) (incorporated by 

reference, see §63.14); and 
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 ii. You calculate the HCl-equivalent 

emissions for HF for each kiln using 

Equation 4 to this subpart; and 

 iii. You sum the HCl-equivalent values 

for all kilns at the facility using 

Equation 5 to this subpart; and 

 iv. The facility total HCl-equivalent 

does not exceed 62 kg/hr (140 lb/hr). 

2. Existing 

floor tile 

roller kiln. 

a. PM emissions 

must not exceed 

0.063 kg/Mg 

(0.13 lb/ton) of 

fired product. 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, appendix A-3 

or Method 29 of 40 CFR part 60, appendix 

A-8, over the period of the initial 

performance test, according to the 

calculations in §63.8595(f)(1), do not 

exceed 0.063 kg/Mg (0.13 lb/ton) of fired 

product; and 

 ii. You establish and have a record of 

the applicable operating limits listed in 

Table 2 to this subpart over the 3-hour 

performance test during which PM 

emissions did not exceed 0.063 kg/Mg 

(0.13 lb/ton) of fired product. 

 b. Hg emissions 

must not exceed 

6.3 E-05 kg/Mg 

(1.3 E-04 

lb/ton) of fired 

product. 

i. The Hg emissions measured using 

Method 29 of 40 CFR part 60, appendix A-8 

or its alternative, ASTM D6784-02 

(Reapproved 2008) (incorporated by 

reference, see §63.14), over the period 

of the initial performance test, do not 

exceed 6.3 E-05 kg/Mg (1.3 E-04 lb/ton) 

of fired product; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which Hg emissions did not 

exceed 6.3 E-05 kg/Mg (1.3 E-04 lb/ton) 

of fired product. 

 c. Dioxin/furan 

emissions must 

not exceed 2.8 

ng/kg of fired 

product. 

i. The dioxin/furan emissions measured 

using Method 23 of 40 CFR part 60, 

appendix A-7, over the period of the 

initial performance test, do not exceed 

2.8 ng/kg of fired product; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which dioxin/furan emissions 

did not exceed 2.8 ng/kg of fired 

product. 
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3. Existing 

wall tile 

roller kiln 

a. PM emissions 

must not exceed 

0.19 kg/Mg 

(0.37 lb/ton) of 

fired product. 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, appendix A-3 

or Method 29 of 40 CFR part 60, appendix 

A-8, over the period of the initial 

performance test, according to the 

calculations in §63.8595(f)(1), do not 

exceed 0.19 kg/Mg (0.37 lb/ton) of fired 

product; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which PM emissions did not 

exceed 0.19 kg/Mg (0.37 lb/ton) of fired 

producvt. 

 b. Hg emissions 

must not exceed 

1.1 E-04 kg/Mg 

(2.1 E-04 

lb/ton) of fired 

product. 

i. The Hg emissions measured using 

Method 29 of 40 CFR part 60, appendix A-8 

or its alternative, ASTM D6784-02 

(Reapproved 2008) (incorporated by 

reference, see §63.14), over the period 

of the initial performance test, do not 

exceed 1.1 E-04 kg/Mg (2.1 E-04 lb/ton) 

of fired product; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which Hg emissions did not 

exceed 1.1 E-04 kg/Mg (2.1 E-04 lb/ton) 

of fired product. 

 c. Dioxin/furan 

emissions must 

not exceed 0.22 

ng/kg of fired 

product. 

i. The dioxin/furan emissions measured 

using Method 23 of 40 CFR part 60, 

appendix A-7, over the period of the 

initial performance test, do not exceed 

0.22 ng/kg of fired product; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which dioxin/furan emissions 

did not exceed 0.22 ng/kg of fired 

product. 

4. Existing 

first-fire 

sanitaryware 

tunnel kiln 

a. PM emissions 

must not exceed 

0.17 kg/Mg 

(0.34 lb/ton) of 

greenware fired. 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, appendix A-3 

or Method 29 of 40 CFR part 60, appendix 

A-8, over the period of the initial 

performance test, according to the 

calculations in §63.8595(f)(1), do not 

exceed 0.17 kg/Mg (0.34 lb/ton) of 

greenware fired; and 
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 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which PM emissions did not 

exceed 0.17 kg/Mg (0.34 lb/ton) of 

greenware fired. 

 b. Hg emissions 

must not exceed 

1.3 E-04 kg/Mg 

(2.6 E-04 

lb/ton) of 

greenware fired. 

i. The Hg emissions measured using 

Method 29 of 40 CFR part 60, appendix A-8 

or its alternative, ASTM D6784-02 

(Reapproved 2008) (incorporated by 

reference, see §63.14), over the period 

of the initial performance test, do not 

exceed 1.3 E-04 kg/Mg (2.6 E-04 lb/ton) 

of greenware fired; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which Hg emissions did not 

exceed 1.3 E-04 kg/Mg (2.6 E-04 lb/ton) 

of greenware fired. 

 c. Dioxin/furan 

emissions must 

not exceed 3.3 

ng/kg of 

greenware fired. 

i. The dioxin/furan emissions measured 

using Method 23 of 40 CFR part 60, 

appendix A-7, over the period of the 

initial performance test, do not exceed 

3.3 ng/kg of greenware fired; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which dioxin/furan emissions 

did not exceed 3.3 ng/kg of greenware 

fired. 

5. Existing 

tile glaze 

line with 

glaze spraying 

a. PM emissions 

must not exceed 

0.93 kg/Mg 

(1.9 lb/ton) of 

first-fire glaze 

sprayed (dry 

weight basis). 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, appendix A-3, 

over the period of the initial 

performance test, according to the 

calculations in §63.8595(f)(2), do not 

exceed 0.93 kg/Mg (1.9 lb/ton) of firstfire glaze sprayed (dry weight basis); 

and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which PM emissions did not 

exceed 0.93 kg/Mg (1.9 lb/ton) of firstfire glaze sprayed (dry weight basis). 
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 b. Hg emissions 

must not exceed 

8.0 E-05 kg/Mg 

(1.6 E-04 

lb/ton) of 

first-fire glaze 

sprayed (dry 

weight basis). 

i. The Hg emissions measured using 

Method 29 of 40 CFR part 60, appendix A-8 

or its alternative, ASTM D6784-02 

(Reapproved 2008) (incorporated by 

reference, see §63.14), over the period 

of the initial performance test, do not 

exceed 8.0 E-05 kg/Mg (1.6 E-04 lb/ton) 

of first-fire glaze sprayed (dry weight 

basis); and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which Hg emissions did not 

exceed 8.0 E-05 kg/Mg (1.6 E-04 lb/ton) 

of first-fire glaze sprayed (dry weight 

basis). 

6. Existing 

sanitaryware 

manual glaze 

application 

a. PM emissions 

must not exceed 

18 kg/Mg 

(35 lb/ton) of 

first-fire glaze 

sprayed (dry 

weight basis). 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, appendix A-3, 

over the period of the initial 

performance test, according to the 

calculations in §63.8595(f)(2), do not 

exceed 18 kg/Mg (35 lb/ton) of first-fire 

glaze sprayed (dry weight basis); and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which PM emissions did not 

exceed 18 kg/Mg (35 lb/ton) of first-fire 

glaze sprayed (dry weight basis). 

7. Existing 

sanitaryware 

spray machine 

glaze 

application 

a. PM emissions 

must not exceed 

6.2 kg/Mg 

(13 lb/ton) of 

first-fire glaze 

sprayed (dry 

weight basis). 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, appendix A-3, 

over the period of the initial 

performance test, according to the 

calculations in §63.8595(f)(2), do not 

exceed 6.2 kg/Mg (13 lb/ton) of firstfire glaze sprayed (dry weight basis); 

and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which PM emissions did not 

exceed 6.2 kg/Mg (13 lb/ton) of firstfire glaze sprayed (dry weight basis). 

8. Existing 

sanitaryware 

robot glaze 

application 

a. PM emissions 

must not exceed 

4.5 kg/Mg 

(8.9 lb/ton) of 

first-fire glaze 

sprayed (dry 

weight basis). 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, appendix A-3, 

over the period of the initial 

performance test, according to the 

calculations in §63.8595(f)(2), do not 

exceed 4.5 kg/Mg (8.9 lb/ton) of firstfire glaze sprayed (dry weight basis); 

and 
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 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which PM emissions did not 

exceed 4.5 kg/Mg (8.9 lb/ton) of firstfire glaze sprayed (dry weight basis). 

9. Existing 

floor tile 

spray dryer 

a. Dioxin/furan 

emissions must 

not exceed 19 

ng/kg of 

throughput 

processed. 

i. The dioxin/furan emissions measured 

using Method 23 of 40 CFR part 60, 

appendix A-7, over the period of the 

initial performance test, do not exceed 

19 ng/kg of throughput processed; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which dioxin/furan emissions 

did not exceed 19 ng/kg of throughput 

processed. 

10. Existing 

wall tile 

spray dryer 

a. Dioxin/furan 

emissions must 

not exceed 0.058 

ng/kg of 

throughput 

processed. 

i. The dioxin/furan emissions measured 

using Method 23 of 40 CFR part 60, 

appendix A-7, over the period of the 

initial performance test, do not exceed 

0.058 ng/kg of throughput processed; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which dioxin/furan emissions 

did not exceed 0.058 ng/kg of throughput 

processed. 

11. Existing 

floor tile 

press dryer 

a. Dioxin/furan 

emissions must 

not exceed 0.024 

ng/kg of 

throughput 

processed. 

i. The dioxin/furan emissions measured 

using Method 23 of 40 CFR part 60, 

appendix A-7, over the period of the 

initial performance test, do not exceed 

0.024 ng/kg of throughput processed; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which dioxin/furan emissions 

did not exceed 0.024 ng/kg of throughput 

processed. 

12. New or 

reconstructed 

floor tile 

roller kiln. 

a. PM emissions 

must not exceed 

0.019 kg/Mg 

(0.037 lb/ton) 

of fired 

product. 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, appendix A-3 

or Method 29 of 40 CFR part 60, appendix 

A-8, over the period of the initial 

performance test, according to the 

calculations in §63.8595(f)(1), do not 

exceed 0.019 kg/Mg (0.037 lb/ton) of 

fired product; and 
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 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which PM emissions did not 

exceed 0.019 kg/Mg (0.037 lb/ton) of 

fired product. 

 b. Hg emissions 

must not exceed 

2.0 E-05 kg/Mg 

(3.9 E05 lb/ton) of 

fired product. 

i. The Hg emissions measured using 

Method 29 of 40 CFR part 60, appendix A-8 

or its alternative, ASTM D6784-02 

(Reapproved 2008) (incorporated by 

reference, see §63.14), over the period 

of the initial performance test, do not 

exceed 2.0 E-05 kg/Mg (3.9 E-05 lb/ton) 

of fired product; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which Hg emissions did not 

exceed 2.0 E-05 kg/Mg (3.9 E-05 lb/ton) 

of fired product. 

 c. Dioxin/furan 

emissions must 

not exceed 1.3 

ng/kg of fired 

product. 

i. The dioxin/furan emissions measured 

using Method 23 of 40 CFR part 60, 

appendix A-7, over the period of the 

initial performance test, do not exceed 

1.3 ng/kg of fired product; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which dioxin/furan emissions 

did not exceed 1.3 ng/kg of fired 

product. 

13. New or 

reconstructed 

wall tile 

roller kiln. 

a. PM emissions 

must not exceed 

0.19 kg/Mg 

(0.37 lb/ton) of 

fired product. 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, appendix A-3 

or Method 29 of 40 CFR part 60, appendix 

A-8, over the period of the initial 

performance test, according to the 

calculations in §63.8595(f)(1), do not 

exceed 0.19 kg/Mg (0.37 lb/ton) of fired 

product; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which PM emissions did not 

exceed 0.19 kg/Mg (0.37 lb/ton) of fired 

product. 
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 b. Hg emissions 

must not exceed 

1.1 E-04 kg/Mg 

(2.1 E04 lb/ton) of 

fired product. 

i. The Hg emissions measured using 

Method 29 of 40 CFR part 60, appendix A-8 

or its alternative, ASTM D6784-02 

(Reapproved 2008) (incorporated by 

reference, see §63.14), over the period 

of the initial performance test, do not 

exceed 1.1 E-04 kg/Mg (2.1 E-04 lb/ton) 

of fired product; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which Hg emissions did not 

exceed 1.1 E-04 kg/Mg (2.1 E-04 lb/ton) 

of fired product. 

 c. Dioxin/furan 

emissions must 

not exceed 0.22 

ng/kg of fired 

product. 

i. The dioxin/furan emissions measured 

using Method 23 of 40 CFR part 60, 

appendix A-7, over the period of the 

initial performance test, do not exceed 

0.22 ng/kg of fired product; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which dioxin/furan emissions 

did not exceed 0.22 ng/kg of fired 

product. 

14. New or 

reconstructed 

first-fire 

sanitaryware 

tunnel kiln 

a. PM emissions 

must not exceed 

0.048 kg/Mg 

(0.095 lb/ton) 

of greenware 

fired. 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, appendix A-3 

or Method 29 of 40 CFR part 60, appendix 

A-8, over the period of the initial 

performance test, according to the 

calculations in §63.8595(f)(1), do not 

exceed 0.048 kg/Mg (0.095 lb/ton) of 

greenware fired; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which PM emissions did not 

exceed 0.048 kg/Mg (0.095 lb/ton) of 

greenware fired. 

 b. Hg emissions 

must not exceed 

6.1 E-05 kg/Mg 

(1.3 E04 lb/ton) of 

greenware fired. 

i. The Hg emissions measured using 

Method 29 of 40 CFR part 60, appendix A-8 

or its alternative, ASTM D6784-02 

(Reapproved 2008) (incorporated by 

reference, see §63.14), over the period 

of the initial performance test, do not 

exceed 6.1 E-05 kg/Mg (1.3 E-04 lb/ton) 

of greenware fired; and 
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 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which Hg emissions did not 

exceed 6.1 E-05 kg/Mg (1.3 E-04 lb/ton) 

of greenware fired. 

 c. Dioxin/furan 

emissions must 

not exceed 0.99 

ng/kg of 

greenware fired. 

i. The dioxin/furan emissions measured 

using Method 23 of 40 CFR part 60, 

appendix A-7, over the period of the 

initial performance test, do not exceed 

0.99 ng/kg of greenware fired; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which dioxin/furan emissions 

did not exceed 0.99 ng/kg of greenware 

fired. 

15. New or 

reconstructed 

tile glaze 

line with 

glaze spraying 

a. PM emissions 

must not exceed 

0.31 kg/Mg 

(0.61 lb/ton) of 

first-fire glaze 

sprayed (dry 

weight basis). 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, appendix A-3, 

over the period of the initial 

performance test, according to the 

calculations in §63.8595(f)(2), do not 

exceed 0.31 kg/Mg (0.61 lb/ton) of firstfire glaze sprayed (dry weight basis); 

and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which PM emissions did not 

exceed 0.31 kg/Mg (0.61 lb/ton) of firstfire glaze sprayed (dry weight basis). 

 b. Hg emissions 

must not exceed 

8.0 E-05 kg/Mg 

(1.6 E-04 

lb/ton) of 

first-fire glaze 

sprayed (dry 

weight basis). 

i. The Hg emissions measured using 

Method 29 of 40 CFR part 60, appendix A-8 

or its alternative, ASTM D6784-02 

(Reapproved 2008) (incorporated by 

reference, see §63.14), over the period 

of the initial performance test, do not 

exceed 8.0 E-05 kg/Mg (1.6 E-04 lb/ton) 

of first-fire glaze sprayed (dry weight 

basis); and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which Hg emissions did not 

exceed 8.0 E-05 kg/Mg (1.6 E-04 lb/ton) 

of first-fire glaze sprayed (dry weight 

basis). 
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16. New or 

reconstructed 

sanitaryware 

manual glaze 

application 

a. PM emissions 

must not exceed 

2.0 kg/Mg 

(3.9 lb/ton) of 

first-fire glaze 

sprayed (dry 

weight basis). 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, appendix A-3, 

over the period of the initial 

performance test, according to the 

calculations in §63.8595(f)(2), do not 

exceed 2.0 kg/Mg (3.9 lb/ton) of firstfire glaze sprayed (dry weight basis); 

and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which PM emissions did not 

exceed 2.0 kg/Mg (3.9 lb/ton) of firstfire glaze sprayed (dry weight basis). 

17. New or 

reconstructed 

sanitaryware 

spray machine 

glaze 

application 

a. PM emissions 

must not exceed 

1.6 kg/Mg 

(3.2 lb/ton) of 

first-fire glaze 

sprayed (dry 

weight basis). 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, appendix A-3, 

over the period of the initial 

performance test, according to the 

calculations in §63.8595(f)(2), do not 

exceed 1.6 kg/Mg (3.2 lb/ton) of firstfire glaze sprayed (dry weight basis); 

and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which PM emissions did not 

exceed 1.6 kg/Mg (3.2 lb/ton) of firstfire glaze sprayed (dry weight basis). 

18. New or 

reconstructed 

sanitaryware 

robot glaze 

application 

a. PM emissions 

must not exceed 

1.2 kg/Mg 

(2.4 lb/ton) of 

first-fire glaze 

sprayed (dry 

weight basis). 

i. The PM emissions measured using 

Method 5 of 40 CFR part 60, appendix A-3, 

over the period of the initial 

performance test, according to the 

calculations in §63.8595(f)(2), do not 

exceed 1.2 kg/Mg (2.4 lb/ton) of firstfire glaze sprayed (dry weight basis); 

and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which PM emissions did not 

exceed 1.2 kg/Mg (2.4 lb/ton) of firstfire glaze sprayed (dry weight basis). 

19. New or 

reconstructed 

floor tile 

spray dryer 

a. Dioxin/furan 

emissions must 

not exceed 0.071 

ng/kg of 

throughput 

processed. 

i. The dioxin/furan emissions measured 

using Method 23 of 40 CFR part 60, 

appendix A-7, over the period of the 

initial performance test, do not exceed 

0.071 ng/kg of throughput processed; and 
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 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which dioxin/furan emissions 

did not exceed 0.071 ng/kg of throughput 

processed. 

20. New or 

reconstructed 

wall tile 

spray dryer 

a. Dioxin/furan 

emissions must 

not exceed 0.058 

ng/kg of 

throughput 

processed. 

i. The dioxin/furan emissions measured 

using Method 23 of 40 CFR part 60, 

appendix A-7, over the period of the 

initial performance test, do not exceed 

0.058 ng/kg of throughput processed; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which dioxin/furan emissions 

did not exceed 0.058 ng/kg of throughput 

processed. 

21. New or 

reconstructed 

floor tile 

press dryer 

a. Dioxin/furan 

emissions must 

not exceed 0.024 

ng/kg of 

throughput 

processed. 

i. The dioxin/furan emissions measured 

using Method 23 of 40 CFR part 60, 

appendix A-7, over the period of the 

initial performance test, do not exceed 

0.024 ng/kg of throughput processed; and 

 ii. You establish and have a record of 

the operating limits listed in Table 2 to 

this subpart over the 3-hour performance 

test during which dioxin/furan emissions 

did not exceed 0.024 ng/kg of throughput 

processed. 

22. Existing, 

new, or 

reconstructed 

sanitaryware 

shuttle kiln. 

a. Minimize HAP 

emissions. 

i. Use natural gas, or equivalent, as the 

kiln fuel; and 

 ii. Develop a designed firing time and 

temperature cycle for the sanitaryware 

shuttle kiln. You must either program the 

time and temperature cycle into your kiln 

or track each step on a log sheet; and 

 iii. Label each sanitaryware shuttle kiln 

with the maximum load (in tons) of 

greenware that can be fired in the kiln 

during a single firing cycle; and 

 iv. Develop maintenance procedures for 

each kiln that, at a minimum, specify the 

frequency of inspection and maintenance 

of temperature monitoring devices, 

controls that regulate air-to-fuel 

ratios, and controls that regulate firing 

cycles. 
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As stated in §63.8620, you must demonstrate continuous 

compliance with each emission limitation and work practice 

standard that applies to you according to the following table: 

Table 7 to Subpart KKKKK of Part 63--Continuous Compliance with 

Emission Limitations and Work Practice Standards 

For each... 

For the 

following... 

You must demonstrate continuous 

compliance by... 

1. Tunnel or 

roller kiln 

equipped with a 

DIFF or DLS/FF. 

a. Each emission 

limit in Table 1 to 

this subpart and 

each operating 

limit in Item 1 of 

Table 2 to this 

subpart for kilns 

equipped with DIFF 

or DLS/FF. 

i. If you use a bag leak detection 

system, as prescribed in 63.8450(e), 

initiating corrective action within 

1 hour of a bag leak detection 

system alarm and completing 

corrective actions in accordance 

with your OM&M plan; operating and 

maintaining the fabric filter such 

that the alarm is not engaged for 

more than 5 percent of the total 

operating time in a 6-month block 

reporting period; in calculating 

this operating time fraction, if 

inspection of the fabric filter 

demonstrates that no corrective 

action is required, no alarm time is 

counted; if corrective action is 

required, each alarm is counted as a 

minimum of 1 hour; if you take 

longer than 1 hour to initiate 

corrective action, the alarm time is 

counted as the actual amount of time 

taken by you to initiate corrective 

action; or performing VE 

observations of the DIFF or DLS/FF 

stack at the frequency specified in 

§63.8620(e) using Method 22 of 40 

CFR part 60, appendix A-7; and 

maintaining no VE from the DIFF or 

DLS/FF stack; and 

 ii. Verifying that lime is freeflowing via a load cell, carrier 

gas/lime flow indicator, carrier gas 

pressure drop measurement system, or 

other system; recording all monitor 

or sensor output, and if lime is 

found not to be free flowing, 

promptly initiating and completing 

corrective actions in accordance 
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with your OM&M plan; recording the 

feeder setting once each shift of 

operation to verify that the feeder 

setting is being maintained at or 

above the level established during 

the HF/HCl performance test. 

2. Tunnel or 

roller kiln 

equipped with a 

WS. 

a. Each emission 

limit in Table 1 to 

this subpart and 

each operating 

limit in Item 2 of 

Table 2 to this 

subpart for kilns 

equipped with WS. 

i. Collecting the scrubber pressure 

drop data according to §63.8600(a); 

reducing the scrubber pressure drop 

data to 3-hour block averages 

according to §63.8600(a); 

maintaining the average scrubber 

pressure drop for each 3-hour block 

period at or above the average 

pressure drop established during the 

PM performance test; and 

 ii. Collecting the scrubber liquid 

pH data according to §63.8600(a); 

reducing the scrubber liquid pH data 

to 3-hour block averages according 

to §63.8600(a); maintaining the 

average scrubber liquid pH for each 

3-hour block period at or above the 

average scrubber liquid pH 

established during the HF/HCl 

performance test; and 

 iii. Collecting the scrubber liquid 

flow rate data according to 

§63.8600(a); reducing the scrubber 

liquid flow rate data to 3-hour 

block averages according to 

§63.8600(a); maintaining the average 

scrubber liquid flow rate for each 

3-hour block period at or above the 

highest average scrubber liquid flow 

rate established during the HF/HCl 

and PM performance tests; and 

 iv. If chemicals are added to the 

scrubber water, collecting the 

scrubber chemical feed rate data 

according to §63.8600(a); reducing 

the scrubber chemical feed rate data 

to 3-hour block averages according 

to §63.8600(a); maintaining the 

average scrubber chemical feed rate 

for each 3-hour block period at or 

above the average scrubber chemical 

feed rate established during the 

HF/HCl performance test. 

3. Tunnel or 

roller kiln 

equipped with an 

ACI system. 

Each emission limit 

in Table 1 to this 

subpart and each 

operating limit in 

Collecting the carbon flow rate data 

according to §63.8600(a); reducing 

the carbon flow rate data to 3-hour 

block averages according to 
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Item 3 of Table 2 

to this subpart for 

kilns equipped with 

ACI system. 

§63.8600(a); maintaining the average 

carbon flow rate for each 3-hour 

block period at or above the highest 

average carbon flow rate established 

during the Hg and dioxin/furan 

performance tests. 

4. Tunnel or 

roller kiln 

intending to 

comply with 

dioxin/furan 

emission limit 

without an ACI 

system. 

Each emission limit 

in Table 1 to this 

subpart and each 

operating limit in 

Item 4 of Table 2 

to this subpart for 

kilns intending to 

comply with 

dioxin/furan 

emission limit 

without an ACI 

system. 

Collecting the kiln peak temperature 

data according to §63.8600(a); 

reducing the kiln peak temperature 

data to 3-hour block averages 

according to §63.8600(a); 

maintaining the average kiln peak 

temperature for each 3-hour block 

period at or below the average peak 

temperature established during the 

dioxin/furan performance test. 

5. Tunnel or 

roller kiln with 

no add-on 

control 

a. Each emission 

limit in Table 1 to 

this subpart and 

each operating 

limit in Item 5 of 

Table 2 to this 

subpart for tunnel 

or roller kilns 

with no add-on 

control. 

i. Performing VE observations of the 

stack at the frequency specified in 

§63.8620(e) using Method 22 of 40 

CFR part 60, appendix A-7; and 

maintaining no VE from the stack. 

 ii. If your last calculated total 

facility maximum potential HClequivalent was not at or below the 

health-based standard in Table 1 to 

this subpart, collecting the kiln 

process rate data according to 

§63.8600(a); reducing the kiln 

process rate data to 3-hour block 

averages according to §63.8600(a); 

maintaining the average kiln process 

rate for each 3-hour block period at 

or below the kiln process rate 

determined according to 

§63.8595(g)(1). 

 iii. Collecting the kiln operating 

temperature data according to 

§63.8600(a); reducing the kiln 

operating temperature data to 3-hour 

block averages according to 

§63.8600(a); maintaining the average 

kiln operating temperature for each 

3-hour block period at or above the 

average operating temperature 

established during the dioxin/furan 

performance test. 
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6. Glaze spray 

operation 

equipped with a 

FF. 

Each emission limit 

in Table 1 to this 

subpart and each 

operating limit in 

Item 6 of Table 2 

to this subpart for 

glaze spray 

operations equipped 

with a FF. 

If you use a bag leak detection 

system, initiating corrective action 

within 1 hour of a bag leak 

detection system alarm and 

completing corrective actions in 

accordance with your OM&M plan; 

operating and maintaining the fabric 

filter such that the alarm is not 

engaged for more than 5 percent of 

the total operating time in a 6-

month block reporting period; in 

calculating this operating time 

fraction, if inspection of the 

fabric filter demonstrates that no 

corrective action is required, no 

alarm time is counted; if corrective 

action is required, each alarm is 

counted as a minimum of 1 hour; if 

you take longer than 1 hour to 

initiate corrective action, the 

alarm time is counted as the actual 

amount of time taken by you to 

initiate corrective action; or 

performing VE observations of the FF 

stack at the frequency specified in 

§63.8620(e) using Method 22 of 40 

CFR part 60, appendix A-7; and 

maintaining no VE from the FF stack. 

7. Glaze spray 

operation 

equipped with a 

WS. 

a. Each emission 

limit in Table 1 to 

this subpart and 

each operating 

limit in Item 7 of 

Table 2 to this 

subpart for kilns 

equipped with WS. 

i. Collecting the scrubber pressure 

drop data according to §63.8600(a); 

reducing the scrubber pressure drop 

data to 3-hour block averages 

according to §63.8600(a); 

maintaining the average scrubber 

pressure drop for each 3-hour block 

period at or above the average 

pressure drop established during the 

PM performance test; and 

 ii. Collecting the scrubber liquid 

flow rate data according to 

§63.8600(a); reducing the scrubber 

liquid flow rate data to 3-hour 

block averages according to 

§63.8600(a); maintaining the average 

scrubber liquid flow rate for each 

3-hour block period at or above the 

average scrubber liquid flow rate 

established during the PM 

performance test. 

8. Glaze spray 

operation 

equipped with a 

water curtain. 

a. Each emission 

limit in Table 1 to 

this subpart and 

each operating 

Conducting daily inspections to 

verify the presence of water flow to 

the wet control system; and 
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limit in Item 8 of 

Table 2 to this 

subpart for kilns 

equipped with a 

water curtain. 

 Conducting weekly visual inspections 

of the system ductwork and control 

equipment for leaks; and 

 Conducting annual inspections of the 

interior of the control equipment 

(if applicable) to determine the 

structural integrity and condition 

of the control equipment. 

9. Glaze spray 

operation 

equipped with 

baffles. 

Each emission limit 

in Table 1 to this 

subpart and each 

operating limit in 

Item 9 of Table 2 

to this subpart for 

kilns equipped with 

baffles. 

Conducting an annual visual 

inspection of the baffles to confirm 

the baffles are in place. 

10. Spray dryer Each emission limit 

in Table 1 to this 

subpart and each 

operating limit in 

Item 10 of Table 2 

to this subpart for 

spray dryers. 

Collecting the operating temperature 

data according to §63.8600(a); 

reducing the operating temperature 

data to 3-hour block averages 

according to §63.8600(a); 

maintaining the average operating 

temperature for each 3-hour block 

period at or above the average 

operating temperature established 

during the dioxin/furan performance 

test. 

11. Floor tile 

press dryer 

Each emission limit 

in Table 1 to this 

subpart and each 

operating limit in 

Item 11 of Table 2 

to this subpart for 

floor tile press 

dryers. 

Collecting the operating temperature 

data according to §63.8600(a); 

reducing the operating temperature 

data to 3-hour block averages 

according to §63.8600(a); 

maintaining the average operating 

temperature for each 3-hour block 

period at or below the average 

operating temperature established 

during the dioxin/furan performance 

test. 

12. Sanitaryware 

shuttle kiln 

a. Minimize HAP 

emissions. 

i. Maintaining records documenting 

your use of natural gas, or an 

equivalent fuel, as the kiln fuel at 

all times except during periods of 

natural gas curtailment or supply 

interruption; and

 ii. If you intend to use an 

alternative fuel, submitting a 

notification of alternative fuel use 
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within 48 hours of the declaration 

of a period of natural gas 

curtailment or supply interruption, 

as defined in §63.8665; and 

 iii. Submitting a report of 

alternative fuel use within 10 

working days after terminating the 

use of the alternative fuel, as 

specified in §63.8635(g); and 

 iv. Using a designed firing time and 

temperature cycle for each 

sanitaryware shuttle kiln; and 

 v. For each firing load, documenting 

the total tonnage of greenware 

placed in the kiln to ensure that it 

is not greater than the maximum load 

identified in Item 1.a.iii of Table 

3 to this subpart; and 

 vi. Following maintenance procedures 

for each kiln that, at a minimum, 

specify the frequency of inspection 

and maintenance of temperature 

monitoring devices, controls that 

regulate air-to-fuel ratios, and 

controls that regulate firing 

cycles; and 

 vii. Developing and maintaining 

records for each sanitaryware 

shuttle kiln, as specified in 

§63.8640. 

As stated in §63.8545, you must meet each compliance date 

in the following table that applies to you: 

Table 8 to Subpart KKKKK of Part 63--Compliance Dates 

If you have a(n)... Then you must... No later than... 

1. New or reconstructed 

affected source and the initial 

startup of your affected source 

is after December 18, 2014, but 

before [insert date 60 days 

from date of publication]

Comply with the 

applicable emission 

limitations and work 

practice standards in 

Tables 1, 2, and 3 to 

this subpart 

[Insert date 60 

days from date 

of publication].
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If you have a(n)... Then you must... No later than... 

2. New or reconstructed 

affected source and the initial 

startup of your affected source 

is after [insert date 60 days 

from date of publication]

Comply with the 

applicable emission 

limitations and work 

practice standards in 

Tables 1, 2, and 3 to 

this subpart 

Initial startup 

of your affected 

source. 

3. Existing affected source Comply with the 

applicable emission 

limitations and work 

practice standards in 

Tables 1, 2, and 3 to 

this subpart 

[Insert date 3 

years and 60 

days from date 

of publication].

4. Existing area source that 

increases its emissions or its 

potential to emit such that it 

becomes a major source of HAP 

by adding a new affected source 

or by reconstructing 

Be in compliance with 

this subpart 

Initial startup 

of your affected 

source as a 

major source.

5. New area source (i.e., an 

area source for which 

construction or reconstruction 

commenced after December 18, 

2014) that increases its 

emissions or its potential to 

emit such that it becomes a 

major source of HAP 

Be in compliance with 

this subpart 

Initial startup 

of your affected 

source as a 

major source.

As stated in §63.8630, you must submit each notification 

that applies to you according to the following table: 

Table 9 to Subpart KKKKK of Part 63--Deadlines for Submitting 

Notifications 

If you... You must... No later than... 

As specified 

in... 

1. Start up your 

affected source before 

[insert date 60 days 

from date of 

publication]

Submit an 

Initial 

Notification 

[Insert date 240 

days from date of 

publication]

§63.9(b)(2). 

2. Start up your new or 

reconstructed affected 

source on or after 

[insert date 60 days 

from date of 

publication]

Submit an 

Initial 

Notification 

120 calendar days 

after you become 

subject to this 

subpart 

§63.9(b)(2). 
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3. Are required to 

conduct a performance 

test 

Submit a 

notification of 

intent to 

conduct a 

performance test

60 calendar days 

before the 

performance test 

is scheduled to 

begin 

§63.7(b)(1). 

4. Are required to 

conduct a compliance 

demonstration that 

includes a performance 

test according to the 

requirements in Table 4 

to this subpart 

Submit a 

Notification of 

Compliance 

Status, 

including the 

performance test 

results 

60 calendar days 

following the 

completion of the 

performance test, 

by the close of 

business 

§63.9(h) and 

§63.10(d)(2).

5. Are required to 

conduct a compliance 

demonstration required 

in Table 6 to this 

subpart that does not 

include a performance 

test (i.e., compliance 

demonstrations for the 

work practice 

standards) 

Submit a 

Notification of 

Compliance 

Status 

30 calendar days 

following the 

completion of the 

compliance 

demonstrations, 

by the close of 

business 

§63.9(h). 

6. Request a routine 

control device 

maintenance exemption 

according to 

§63.8570(d) 

Submit your 

request for the 

exemption 

30 calendar days 

before the 

compliance date 

specified in 

§63.8545. 

7. Own or operate an 

affected kiln that is 

subject to the work 

practice standard 

specified in Item 1 of 

Table 3 to this 

subpart, and you intend 

to use a fuel other 

than natural gas or 

equivalent to fire the 

affected kiln 

Submit a 

notification of 

alternative fuel 

use 

48 hours 

following the 

declaration of a 

period of natural 

gas curtailment 

or supply 

interruption, as 

defined in 

§63.8665. 

As stated in §63.8635, you must submit each report that 

applies to you according to the following table: 

Table 10 to Subpart KKKKK of Part 63--Requirements for Reports 

You must 

submit... The report must contain... 

You must submit the 

report... 
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1. A compliance 

report. 

a. If there are no deviations from 

any emission limitations or work 

practice standards that apply to 

you, a statement that there were 

no deviations from the emission 

limitations or work practice 

standards during the reporting 

period. If there were no periods 

during which the CMS was out-ofcontrol as specified in your OM&M 

plan, a statement that there were 

no periods during which the CMS 

was out-of-control during the 

reporting period. 

Semiannually according 

to the requirements in 

§63.8635(b). 

 b. If you have a deviation from 

any emission limitation (emission 

limit, operating limit) during the 

reporting period, the report must 

contain the information in 

§63.8635(c)(8). If there were 

periods during which the CMS was 

out-of-control, as specified in 

your OM&M plan, the report must 

contain the information in 

§63.8635(d). 

Semiannually according 

to the requirements in 

§63.8635(b). 

2. A report of 

alternative fuel 

use. 

The information in §63.8635(g). If you are subject to 

the work practice 

standards specified in 

Table 3 to this 

subpart, and you use 

an alternative fuel to 

fire an affected kiln, 

by letter within 10 

working days after 

terminating the use of 

the alternative fuel. 

As stated in §63.8655, you must comply with the General 

Provisions in §§63.1 through 63.16 that apply to you according 

to the following table: 

Table 11 to Subpart KKKKK of Part 63--Applicability of General 

Provisions to Subpart KKKKK 
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Citation Subject Brief Description 

Applies to 

Subpart KKKKK? 

§63.1 Applicability. Initial applicability 

determination; 

applicability after 

standard established; 

permit requirements; 

extensions, 

notifications. 

Yes. 

§63.2 Definitions. Definitions for part 

63 standards. 

Yes. 

§63.3 Units and 

Abbreviations. 

Units and 

abbreviations for part 

63 standards. 

Yes. 

§63.4 Prohibited 

Activities. 

Compliance date; 

circumvention; 

severability. 

Yes. 

§63.5 Construction/ 

Reconstruction. 

Applicability; 

applications; 

approvals. 

Yes. 

§63.6(a) Applicability. General Provisions 

(GP) apply unless 

compliance extension; 

GP apply to area 

sources that become 

major. 

Yes. 

§63.6(b)(1)-(4) Compliance 

Dates for New 

and 

Reconstructed 

sources. 

Standards apply at 

effective date; 3 

years after effective 

date; upon startup; 10 

years after 

construction or 

reconstruction 

commences for section 

112(f). 

Yes. 

§63.6(b)(5) Notification. Must notify if 

commenced construction 

or reconstruction 

after proposal. 

Yes. 

§63.6(b)(6) [Reserved]. 

§63.6(b)(7) Compliance 

Dates for New 

and 

Reconstructed 

Area Sources 

That Become 

Major. 

Area sources that 

become major must 

comply with major 

source standards 

immediately upon 

becoming major, 

regardless of whether 

required to comply 

when they were area 

sources. 

Yes. 
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§63.6(c)(1)-(2) Compliance 

Dates for 

Existing 

Sources. 

Comply according to 

date in subpart, which 

must be no later than 

3 years after 

effective date; for 

section 112(f) 

standards, comply 

within 90 days of 

effective date unless 

compliance extension. 

Yes. 

§63.6(c)(3)-(4) [Reserved]. No. 

§63.6(c)(5) Compliance 

Dates for 

Existing Area 

Sources That 

Become Major. 

Area sources that 

become major must 

comply with major 

source standards by 

date indicated in 

subpart or by 

equivalent time period 

(for example, 3 

years). 

Yes. 

§63.6(d) [Reserved]. No. 

§63.6(e)(1)(i) Operation & 

Maintenance. 

General Duty to 

minimize emissions. 

No. See 

§63.8570(b) 

for general 

duty 

requirement. 

§63.6(e)(1)(ii) Operation & 

Maintenance. 

Requirement to correct 

malfunctions ASAP. 

No. 

§63.6(e)(1)(iii) Operation & 

Maintenance. 

Operation and 

maintenance 

requirements 

enforceable 

independent of 

emissions limitations. 

Yes. 

§63.6(e)(2) [Reserved]. No. 

§63.6(e)(3) Startup, 

Shutdown, and 

Malfunction 

Plan (SSMP). 

Requirement for 

startup, shutdown, and 

malfunction (SSM) and 

SSMP; content of SSMP. 

No. 

§63.6(f)(1) Compliance 

Except During 

SSM. 

You must comply with 

emission standards at 

all times except 

during SSM. 

No. 

§63.6(f)(2)-(3) Methods for 

Determining 

Compliance. 

Compliance based on 

performance test, 

operation and 

maintenance plans, 

records, inspection. 

Yes. 
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§63.6(g) Alternative 

Standard. 

Procedures for getting 

an alternative 

standard. 

Yes. 

§63.6(h) Opacity/VE 

Standards. 

Requirements for 

opacity and VE 

standards. 

No, not 

applicable. 

§63.6(i) Compliance 

Extension. 

Procedures and 

criteria for 

Administrator to grant 

compliance extension. 

Yes. 

§63.6(j) Presidential 

Compliance 

Exemption. 

President may exempt 

source category. 

Yes. 

§63.7(a)(1)-(2) Performance 

Test Dates. 

Dates for conducting 

initial performance 

testing and other 

compliance 

demonstrations for 

emission limits and 

work practice 

standards; must 

conduct 180 days after 

first subject to rule. 

Yes. 

§63.7(a)(3) Section 114 

Authority. 

Administrator may 

require a performance 

test under CAA section 

114 at any time. 

Yes. 

§63.7(a)(4) Notification of 

Delay in 

Performance 

Testing Due To 

Force Majeure. 

Must notify 

Administrator of delay 

in performance testing 

due to force majeure. 

Yes. 

§63.7(b)(1) Notification of 

Performance 

Test. 

Must notify 

Administrator 60 days 

before the test. 

Yes. 

§63.7(b)(2) Notification of 

Rescheduling. 

Must notify 

Administrator 5 days 

before scheduled date 

of rescheduled date. 

Yes. 

§63.7(c) Quality 

Assurance (QA)/ 

Test Plan. 

Requirements; test 

plan approval 

procedures; 

performance audit 

requirements; internal 

and external QA 

procedures for 

testing. 

Yes. 

§63.7(d) Testing 

Facilities. 

Requirements for 

testing facilities. 

Yes. 
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§63.7(e)(1) Conditions for 

Conducting 

Performance 

Tests. 

Performance tests must 

be conducted under 

representative 

conditions. 

No, §63.8595 

specifies 

requirements. 

Cannot conduct 

performance tests 

during SSM; not a 

violation to exceed 

standard during SSM. 

Yes. 

§63.7(e)(2)-(3) Conditions for 

Conducting 

Performance 

Tests. 

Must conduct according 

to subpart and EPA 

test methods unless 

Administrator approves 

alternative; must have 

at least three test 

runs of at least 1 

hour each; compliance 

is based on arithmetic 

mean of three runs; 

conditions when data 

from an additional 

test run can be used. 

Yes. 

§63.7(e)(4) Testing under 

Section 114 

Administrator’s 

authority to require 

testing under section 

114 of the Act. 

Yes. 

§63.7(f) Alternative 

Test Method. 

Procedures by which 

Administrator can 

grant approval to use 

an alternative test 

method. 

Yes. 

§63.7(g) Performance 

Test Data 

Analysis. 

Must include raw data 

in performance test 

report; must submit 

performance test data 

60 days after end of 

test with the 

notification of 

compliance status. 

Yes. 

§63.7(h) Waiver of 

Tests. 

Procedures for 

Administrator to waive 

performance test. 

Yes. 

§63.8(a)(1) Applicability 

of Monitoring 

Requirements. 

Subject to all 

monitoring 

requirements in 

subpart. 

Yes. 

§63.8(a)(2) Performance 

Specifications. 

Performance 

Specifications in 

appendix B of 40 CFR 

part 60 apply. 

Yes. 

§63.8(a)(3) [Reserved]. No. 
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§63.8(a)(4) Monitoring with 

Flares. 

Requirements for 

flares in §63.11 

apply. 

No, not 

applicable. 

§63.8(b)(1) Monitoring. Must conduct 

monitoring according 

to standard unless 

Administrator approves 

alternative. 

Yes. 

§63.8(b)(2)-(3) Multiple 

Effluents and 

Multiple 

Monitoring 

Systems. 

Specific requirements 

for installing and 

reporting on 

monitoring systems. 

Yes. 

§63.8(c)(1) Monitoring 

System 

Operation and 

Maintenance. 

Maintenance consistent 

with good air 

pollution control 

practices. 

Yes. 

§63.8(c)(1)(i) Routine and 

Predictable 

SSM. 

Reporting requirements 

for SSM when action is 

described in SSMP. 

No. 

§63.8(c)(1)(ii) SSM not in 

SSMP. 

Reporting requirements 

for SSM when action is 

not described in SSMP. 

Yes. 

§63.8(c)(1)(iii) Compliance with 

Operation and 

Maintenance 

Requirements. 

How Administrator 

determines if source 

complying with 

operation and 

maintenance 

requirements. 

No. 

§63.8(c)(2)-(3) Monitoring 

System 

Installation. 

Must install to get 

representative 

emission and parameter 

measurements. 

Yes. 

§63.8(c)(4) CMS 

Requirements. 

Requirements for CMS. No, §63.8600 

specifies 

requirements. 

§63.8(c)(5) Continuous 

Opacity 

Monitoring 

System (COMS) 

Minimum 

Procedures. 

COMS minimum 

procedures. 

No, not 

applicable. 

§63.8(c)(6) CMS 

Requirements. 

Zero and high level 

calibration check 

requirements. 

Yes. 

§63.8(c)(7)-(8) CMS 

Requirements. 

Out-of-control 

periods. 

Yes. 

§63.8(d)(1) and 

(2) 

CMS Quality 

Control. 

Requirements for CMS 

quality control. 

Yes. 
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§63.8(d)(3) CMS Quality 

Control. 

Written procedures for 

CMS. 

No, 

§63.8575(b)(9) 

specifies 

requirements. 

§63.8(e) CMS Performance 

Evaluation. 

Requirements for CMS 

performance 

evaluation. 

Yes. 

§63.8(f)(1)-(5) Alternative 

Monitoring 

Method. 

Procedures for 

Administrator to 

approve alternative 

monitoring. 

Yes. 

§63.8(f)(6) Alternative to 

Relative 

Accuracy Test. 

Procedures for 

Administrator to 

approve alternative 

relative accuracy test 

for continuous 

emission monitoring 

systems (CEMS). 

No, not 

applicable. 

§63.8(g) Data Reduction. COMS and CEMS data 

reduction 

requirements. 

No, not 

applicable. 

§63.9(a) Notification 

Requirements. 

Applicability; State 

delegation. 

Yes. 

§63.9(b) Initial 

Notifications. 

Requirements for 

initial notifications. 

Yes. 

§63.9(c) Request for 

Compliance 

Extension. 

Can request if cannot 

comply by date or if 

installed BACT/LAER. 

Yes. 

§63.9(d) Notification of 

Special 

Compliance 

Requirements 

for New Source. 

For sources that 

commence construction 

between proposal and 

promulgation and want 

to comply 3 years 

after effective date. 

Yes. 

§63.9(e) Notification of 

Performance 

Test. 

Notify Administrator 

60 days prior. 

Yes. 

§63.9(f) Notification of 

VE/Opacity 

Test. 

Notify Administrator 

30 days prior. 

No, not 

applicable. 

§63.9(g)(1) Additional 

Notifications 

When Using CMS. 

Notification of 

performance 

evaluation. 

Yes. 

§63.9(g)(2)-(3) Additional 

Notifications 

When Using CMS. 

Notification of COMS 

data use; notification 

that relative accuracy 

alternative criterion 

were exceeded. 

No, not 

applicable. 
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§63.9(h) Notification of 

Compliance 

Status. 

Contents; submittal 

requirements. 

Yes. 

§63.9(i) Adjustment of 

Submittal 

Deadlines. 

Procedures for 

Administrator to 

approve change in when 

notifications must be 

submitted. 

Yes. 

§63.9(j) Change in 

Previous 

Information. 

Must submit within 15 

days after the change. 

Yes. 

§63.10(a) Recordkeeping/ 

Reporting. 

Applicability; general 

information. 

Yes. 

§63.10(b)(1) General 

Recordkeeping 

Requirements. 

General requirements. Yes. 

§63.10(b)(2)(i) Records Related 

to SSM. 

Recordkeeping of 

occurrence and 

duration of startups 

and shutdowns. 

No. 

§63.10(b)(2)(ii) Records Related 

to SSM. 

Recordkeeping of 

failures to meet a 

standard. 

No. See 

§63.8640(c)(2) 

for 

recordkeeping 

of (1) date, 

time and 

duration; (2) 

listing of 

affected 

source or 

equipment, and 

an estimate of 

the volume of 

each regulated 

pollutant 

emitted over 

the standard; 

and (3) 

actions to 

minimize 

emissions and 

correct the 

failure. 

§63.10(b)(2)(iii) Records Related 

to SSM. 

Maintenance records. Yes. 

§63.10(b)(2)(iv)-

(v) 

Records Related 

to SSM. 

Actions taken to 

minimize emissions 

during SSM. 

No. 
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§63.10(b)(2)(vi)-

(xii) and (xiv) 

CMS Records. Records when CMS is 

malfunctioning, 

inoperative or out-ofcontrol. 

Yes. 

§63.10(b)(2)(xiii) Records. Records when using 

alternative to 

relative accuracy 

test. 

No, not 

applicable. 

§63.10(b)(3) Records. Applicability 

Determinations. 

Yes. 

§63.10(c)(1)-(15) Records. Additional records for 

CMS. 

No, §§63.8575 

and 63.8640 

specify 

requirements. 

§63.10(d)(1) and 

(2) 

General 

Reporting 

Requirements. 

Requirements for 

reporting; performance 

test results 

reporting. 

Yes. 

§63.10(d)(3) Reporting 

Opacity or VE 

Observations. 

Requirements for 

reporting opacity and 

VE. 

No, not 

applicable. 

§63.10(d)(4) Progress 

Reports. 

Must submit progress 

reports on schedule if 

under compliance 

extension. 

Yes. 

§63.10(d)(5) SSM Reports. Contents and 

submission. 

No. See 

§63.8635(c)(8) 

for 

malfunction 

reporting 

requirements. 

§63.10(e)(1)-(3) Additional CMS 

Reports. 

Requirements for CMS 

reporting. 

No, §§63.8575 

and 63.8635 

specify 

requirements. 

§63.10(e)(4) Reporting COMS 

data. 

Requirements for 

reporting COMS data 

with performance test 

data. 

No, not 

applicable. 

§63.10(f) Waiver for 

Recordkeeping/ 

Reporting. 

Procedures for 

Administrator to 

waive. 

Yes. 

§63.11 Flares. Requirement for 

flares. 

No, not 

applicable. 

§63.12 Delegation. State authority to 

enforce standards. 

Yes. 

§63.13 Addresses. Addresses for reports, 

notifications, 

requests. 

Yes. 
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§63.14 Incorporation 

by Reference. 

Materials incorporated 

by reference. 

Yes. 

§63.15 Availability of 

Information. 

Information 

availability; 

confidential 

information. 

Yes. 

§63.16 Performance 

Track 

Provisions. 

Requirements for 

Performance Track 

member facilities. 

Yes.