ENVIRONMENTAL PROTECTION AGENCY 

40 CFR Part 52 

[EPA-R04-OAR-2007-0500-200927 ; FRL- ] 

Approval and Promulgation of Implementation Plans; 

Kentucky: Approval of Revisions to the State Implementation Plan 

AGENCY : Environmental Protection Agency (EPA). 

ACTION : Final rule . 

SUMMARY: EPA is correcting the state implementation plan (SIP) for the Commonwealth of 

Kentucky to remove the "Potentially hazardous matter or toxic substances" rule upon request of 

the Commonwealth of Kentucky made through the Kentucky Division for Air Quality (KDAQ). 

EPA has determined that this rule - 401 Kentucky Administrative Regulations (KAR) 63 :020 -

was erroneously incorporated into the SIP because the rule is not related to the attainment and 

maintenance of the national ambient air quality standards (NAAQS). For this reason, EPA is 

correcting this error and removing this rule from the approved Kentucky SIP pursuant to section 

110(k)(6) of the Clean Air Act (CAA). This final rule also addresses comments made on the 

proposed rulemaking EPA previously published for this action . 

EFFECTIVE DATE: This rule will be effective [insert 30 days after date of publication in the 

Federal Re ig ster] . 

ADDRESSES: EPA has established a docket for this action under Docket Identification No. 

EPA-R04-OAR-2007-0500. All documents in the docket are listed on the www.regulations .Rov 
Web site . Although listed in the index, some information is not publicly available, i .e ., 

Confidential Business Information 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 form. Publicly available docket materials are available 

either electronically through www.regulations .a.ov or in hard copy at the Regulatory 

Development Section, Air Planning Branch, Air, Pesticides and Toxics Management Division, 

U.S . Environmental Protection Agency, Region 4, 61 Forsyth Street, SW, Atlanta, Georgia 

30303-8960. EPA requests that if at all possible, you contact the person listed in the FOR 

FURTHER INFORMATION CONTACT section to schedule your inspection. The Regional 

Office's official hours of business are Monday through Friday, 8:30 to 4:30, excluding federal 

holidays. 

FOR FURTHER INFORMATION CONTACT: Lynorae Benjamin, Chief, Regulatory 

Development Section, Air Planning Branch, Air, Pesticides and Toxics Management Division, 

U.S . Environmental Protection Agency, Region 4, 61 Forsyth Street, SW, Atlanta, Georgia 

30303-8960. The telephone number is (404) 562-9040. Ms. Benjamin can also be reached via 

electronic mail at benjamin.lynoraeCepa.g_o_v . 

SUPPLEMENTARY INFORMATION: 

Table of Contents 

I. What Action Is EPA Taking? 

II . What Is the Background for the Action? 

III. Response to Comments 
IV. Final Action 

V. Statutory and Executive Order Reviews 

I. What Action Is EPA Taking? 

EPA is taking final action to remove 401 KAR 63 :020 from the Kentucky SIP. EPA has 

determined that this rule was erroneously incorporated into the SIP because the rule is not related 

to the attainment and maintenance of the NAAQS. EPA is correcting this error and removing 

this rule from the approved Kentucky SIP. 

II. What Is the Background for the Action? 

The CAA requires EPA to establish NAAQS for commonly occurring air pollutants that 

pose public health and welfare threats. These pollutants are known as criteria pollutants . 

Currently, NAAQS exist for six criteria pollutants - ozone (ground level), particulate matter, 

carbon monoxide, sulfur dioxide, lead and nitrogen dioxide. Section 110 of the CAA requires 

states to adopt, and submit to EPA for approval, SIN to implement, maintain and enforce the 

NAAQS. Accordingly, SIN contain the measures used by states to attain and maintain the 

NAAQS. Consistent with Section 110 of the CAA, provisions approved by EPA as part of a SIP 

should be related to attainment and maintenance of the NAAQS for the six criteria pollutants . 

Other pollutants, such as hazardous air pollutants are covered by other provisions of the CAA, 

such as Section 112, which provides for the direct Federal regulation of hazardous air pollutants . 

The first significant amendments to the CAA occurred in 1970 and 1977 . Following 

these amendments, a large number of SIN were submitted to EPA to fulfill new Federal 

requirements . In many cases, states and districts submitted their entire programs, including 

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many elements not required pursuant to the CAA. Due to resource constraints during this 

timeframe, EPA's review of these submittals focused primarily on the required technical, legal, 

and enforcement elements of the submittals. At the time, EPA did not perform a detailed review 

of the numerous provisions submitted to determine if each provision was related to the 

attainment and maintenance of the NAAQS. As a result, some provisions were approved into 

SIPs erroneously. To correct such errors, EPA has removed the erroneously incorporated 

provisions from SIPs under the authority of Section 110(k)(6) of the CAA. See e.g., 73 FR 

21546 (removing rules from New York SIP imposing general duty not to cause air pollution or 

odors) ; 71 FR 13551 (removing nuisance rule from Georgia SIP); 66 FR 57391 (removing from 

the Missoula City-County portion of the Montana SIP provisions relating to, among other things, 

fluoride emission standards); 64 FR 7790 (removing from Michigan SIP a general air pollution 

rule which had been used primarily to address odors and other nuisances, and had not been used 

for purposes of attaining or maintaining NAAQS); 61 FR 47058 (removing provisions from 

Wyoming SIP relating to, among other things, hydrogen sulfide and fluoride ambient standards, 

and odor control). 

After the 1977 CAA Amendments, the Commonwealth of Kentucky included the 

"Potentially hazardous matter or toxic substances" rule at 401 KAR 63 :020 as part of a 

voluminous SIP submittal to EPA. EPA approved 401 KAR 63:020 as part of the Kentucky SIP 

on July 12, 1982, with a September 10, 1982, effective date. 47 FR 30059 .1 This Kentucky rule 

applies to facilities "which emit[] or may emit potentially hazardous matter or toxic substances 

as defined in Section 2, provided such emissions are not elsewhere subject to the provisions of 

~ The table at 40 C .F.R. 52.920 contains an incorrect Federal Register citation for EPA's approval date of 401 KAR 63 :020. 
the regulations of the Division of Air Pollution." 401 KAR 63 :020 Section 1 . "Potentially 

hazardous matter or toxic substances" is defined in Section 2 of the rule to mean "matter which 

may be harmful to the health and welfare of humans, animals, and plants, including, but not 

limited to, antimony, arsenic, bismuth, lead, silica, tin and compounds of such materials." The 

rule prohibits emissions of "potentially hazardous matter or toxic substances in such quantities or 

duration as to be harmful to the health and welfare of humans, animals and plants ." 401 KAR 

63:020 Section 3. 

On May 25, 2007, Kentucky, through KDAQ, requested that EPA correct the Kentucky 

SIP by deleting this rule . In addition, KDAQ has explained to EPA that 401 KAR 63 :020 "has 

never been used by the Cabinet to regulate emissions of any of the six criteria pollutants in any 

way that is related to the attainment and maintenance of the NAAQS . . . Nor have any reduction 

credits ever been claimed under this regulation." (March 31, 2008, letter from John S. Lyons, 

Director, KDAQ to Beverly Banister, Director, Air, Pesticides, and Toxics Management 

Division, EPA Region 4)("March 31st letter"). Instead, Kentucky has "used this rule as a riskbased Screening tool for toxic air emissions and [the rule] has been the authority under which 

modeling and permit conditions have been imposed." (March 31st letter). Kentucky has not 

relied on or attributed any emission reductions from this rule to any NAAQS attainment or 

maintenance plans required under Section 110 of the CAA. (June 15, 2009, letter from John S . 

Lyons, Director, KDAQ to Carol L. Kemker, Acting Director, Air, Pesticides, and Toxics 

Management Division, EPA Region 4) (June 15th letter). In sum, Kentucky has consistently 

used this rule to address hazardous or toxic air pollutants, and has never used this rule to regulate 

CAA Section 110 criteria pollutants in any way that is related to the attainment and maintenance 
of NAAQS. For these reasons, EPA's 1982 approval of this rule into the Kentucky SIP was in 

error. 

EPA is therefore removing the rule from the approved SIP under the authority of section 

110(k)(6) of the CAA. EPA is doing so, because it has determined that this rule is not related to 

the attainment and maintenance of the NAAQS. This Kentucky rule applies to emissions of 

potentially hazardous matters or toxic substances, if such emissions are not elsewhere subject to 

regulation by KDAQ (formerly Division of Air Pollution) . 401 KAR 63 :020 Section 1 . 

However, KDAQ elsewhere regulates emissions of pollutants to attain and maintain the NAAQS. 

For example 401 KAR Chapters 51 and 53 regulate emissions of criteria pollutants, and 

emissions affecting criteria pollutants such as precursors. Because KDAQ uses other regulations 

to regulate emissions of criteria pollutants to attain and maintain the NAAQS, and because 

KDAQ has confirmed that 401 KAR 63 :020 "has never been used by the Cabinet to regulate 

emissions of any of the six criteria pollutants in any way that is related to the attainment and 

maintenance of the NAAQS . . . Nor have any reduction credits ever been claimed under this 

regulation," (March 31st letter), EPA has concluded that 401 KAR 63 :020 does not apply to 

emissions relevant to the attainment and maintenance of the NAAQS. As stated above, under 

Section 110 of the CAA, SIPs should contain provisions relevant to attaining and maintaining the 

NAAQS. Kentucky rule 401 KAR 63 :020 is not relevant to attaining and maintaining the 

NAAQS and was erroneously included in the SIP. 

Section 110(k)(6) provides a process for EPA to correct such errors . Specifically, it 

provides that : "[w]henever the Administrator determines that the Administrator's action 

approving, disapproving, or promulgating any plan or plan revision (or part thereof), area 

designation, redesignation, classification, or reclassification was in error, the Administrator may 

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in the same manner as the approval, disapproval, or promulgation, revise such action as 

appropriate without requiring any further submission from the State. Such determination and the 

basis thereof shall be provided to the State and public ." As stated above, EPA previously has 

relied on Section 110(k)(6) of the CAA to remove provisions that were erroneously incorporated 

from SIPs. 

On October 29, 2007 (72 FR 61087), EPA proposed to remove 401 KAR 63 :020 from the 

approved SIP under the authority of section 110(k)(6) of the CAA. EPA subsequently received 

comments from one commenter who opposed the proposed correction. In this action, EPA is 

addressing the adverse comments received and taking final action as described in Section I and 

Section IV for this rulemaking. 

111. Response to Comments 

On May 25, 2007, the Commonwealth of Kentucky, through KDAQ, requested that EPA 

correct the Kentucky SIP to remove 441 KAR 63:020. In an action published on October 29, 

2007 (72 FR 61087), EPA proposed to correct the Kentucky SIP through removal of 401 KAR 

63:020 from the Kentucky SIP. EPA received comments from one commenter on the October 

29, 2007, proposal. The comments are summarized below with EPA responses. EPA is now 

taking final action under Section 110(k)(6) to remove 401 KAR 63 :020 from the Kentucky SIP. 

Comment: The commenter states that 401 KAR 63 :020 is not limited in scope to antimony, 

bismuth, lead, silica, tin and compounds of such materials, but is a narrative backstop regulation 

broadly applicable to any matter emitted in such quantity to be potentially hazardous. The 

regulation, the commenter continues, "is applicable to the six criteria pollutants in those 

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instances where the emission of those pollutants is not otherwise addressed by regulation, such 

as instances where such emissions . . . come from a source which is classified as "minor" but has 

significant localized impacts." 

Response: Pursuant to Section 110 of the CAA, SIN contain measures used by states to attain 

and maintain the NAAQS for the six criteria pollutants . Air toxics, on the other hand, are 

regulated pursuant to other parts of the CAA, including Section 112. The Kentucky rule, by its 

terms, applies to emissions of hazardous air pollutants, not elsewhere regulated by Kentucky. 

The applicability provision for 401 KAR 63 :020, Section 1, states that the rule applies "to each 

affected facility which emits or may emit potentially hazardous matter or toxic substances as 

defined in Section 2 of this administrative regulation, provided such emissions are not elsewhere 

subject to the provisions of the administrative regulations of the Division forAir Quality." 401 

KAR 63:020 Section 1 (emphasis added) . KDAQ elsewhere regulates emissions of pollutants to 

attain and maintain the NAAQS and KDAQ has confirmed that it has never used 401 KAR 

63:020 to regulate criteria pollutants in any way related to attaining or maintaining the NAAQS. 

(March 31st and June 15th letters). Examples of other rules used by KDAQ to regulate 

emissions relevant to attainment and maintenance of the NAAQS include 401 KAR Chapters 51 

and 53, regulating emissions of criteria pollutants and emissions affecting criteria pollutants such 

as precursors. Kentucky's rules also include various provisions regarding minor sources, such as 

401 KAR 52:040. Therefore, by its terms, 401 KAR 63:020, does not apply to emissions 

relevant to the attainment and maintenance of the NAAQS. 
As was explained above, the purpose of SIP-approved rules, consistent with section 110 

of the CAA, is to implement a program to attain and maintain the NAAQS. The rule, 401 KAR 

63 :020, is not directed at attainment or maintenance of any NAAQS. Kentucky uses other rules 

to regulate criteria pollutants to attain and maintain the NAAQS, and KDAQ has confirmed that 

it has never used 401 KAR 63 :020 to regulate criteria pollutants in any way related to attaining 

and maintaining the NAAQS. Thus, the commenter's statement that 63 :020 "is broadly 

applicable to any matter emitted in such quantity to be potentially hazardous" does not consider 

the language in the Kentucky rule which limits its applicability to such emissions that "are not 

elsewhere subject to the provisions of the administrative regulations of the Division for Air 

Quality." 401 KAR 63 :020 Section l . 

~ The March 31, 2008, and June 15, 2009, letters, and other information provided by 

KDAQ to EPA responding to comments raised in response to EPA's October 29, 2007, proposal 

to remove 401 KAR 63 :020 from the SIP are available in the docket for the current final action. 

This information is consistent with KDAQ's position in submitting the May 25, 2007, SIP 

revision requesting that the rule be removed. 

It should also be noted that EPA's current action does not affect the enforceability or 

applicability of the rule as a matter of state law. Nothing in today's action in any way alters the 

status of 401 KAR 63:020 as a Kentucky law or Kentucky's ability to use the rule to impose 

requirements into enforceable permits for sources to which the rule applies. 

Comment: The commenter states that this regulation has been utilized in many instances during 

the years it has been part of the SIP, as a risk-based screening tool and that it has been the 

authority under which the state has required modeling of pollutants and imposed permit 

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conditions for such emissions, including volatile organic compounds that are both potential air 

toxics and are criteria pollutant ozone precursors. The commenter further states that the 

regulation has been utilized to require further reductions beyond those categorically applicable to 

emissions, including criteria pollutant emissions. 

Response: In its March 31, 2008, letter and repeated in its June 15, 2009, letter, KDAQ 

explained that 63 :020 has been used as a risk-based screening tool for toxic air ernissions, and 

"to the extent that a particular emission is both an air toxic and a criteria pollutant," the 

application of this rule "has only been concerned with the toxic impacts of the pollutant." 

(March 31 st letter). In addition, as stated above, Kentucky explained that it "has never used this 

regulation to regulate criteria pollutants in any way that is related to the attainment and 

maintenance of NAAQS; and "never claimed any NAAQS reduction credits under this 

regulation." (March 31st letter; June 15th letter). 

This statement by KDAQ confirms its historical usage of the rule as separate from 

regulation of criteria pollutants for the purpose of attaining and maintaining the NAAQS, and 

supports KDAQ's intent in submitting the May 25, 2007, SIP revision. This statement explains 

that 401 KAR 63:020 was erroneously incorporated into the SIP because it does not relate to the 

attainment, maintenance, and enforcement of the NAAQS in Kentucky. 

EPA is reasonable in relying on information provided by KDAQ about the use of its rule, 

and has relied on similar information from other states to delete erroneously incorporated 

provisions from SIPs. See e.g ., 71 FR 13551 (EPA relied on information provided by Georgia in 

deleting a nuisance rule from Georgia SIP); 63 FR 27492 and 64 FR 7790 (EPA relied on 

information provided by Michigan in deleting a rule used to address odors and nuisances from 

Michigan SIP). 

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Comment: The commenter states that Kentucky has previously proposed to repeal this 

regulation and replace it with a "safety net" regulation. 

Response: Kentucky's authority over its administrative rules is separate from EPA's SIP 

process and is not relevant to this rulemaking. The current action will have no effect on the 

status of 401 KAR 63:020 as a rule as a matter of the law of the Commonwealth of Kentucky. 

Comment: The commenter states that the removal of this rule is not authorized under 110(k)(6) 

because this rule is related to attainment and maintenance of the SIP since it has been the 

regulatory mechanism for requiring reductions of emissions of criteria pollutants . By removing 

this rule from the SIP, EPA is removing a regulatory tool that Kentucky has utilized to control 

criteria pollutants . The commenter also requests that EPA withdraw the proposed rule and 

request documentation from Kentucky of all instances in which emissions, operating conditions, 

or limits have been imposed and where applicants have accepted such limits to avoid imposition 

of conditions arising from the application of this rule . The commenter argues that if the 

application of 401 KAR 63 :020 has resulted in control of criteria pollutants from major or area 

sources, then unless the Commonwealth submits a formal SIP revision providing offsetting 

reductions and demonstrates that removal of this regulation will not result in or interfere with 

continued maintenance and achievement of such reductions, the removal of 401 KAR 63:020 'is 

inappropriate and cannot be undertaken by EPA. 

Response: KDAQ's March 31, 2008, and June 15, 2009, letters to EPA confirmed that 441 

KAR 63 :020 has never been used by KDAQ to regulate the emissions of the six criteria 

pollutants in any way that is related to attainment and maintenance of the NAAQS. EPA is also 

not aware of any such use by Kentucky. 

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IV. Final Action 

EPA is now taking final action to remove Kentucky rule 401 KAR 63:020 from the 

Kentucky SIP pursuant to section 110(k)(6) of the CAA. 

V. Statutory and Executive Order Reviews : 

Under the CAA, the Administrator is required to approve a SIP submission that complies 

with the provisions of the Act and applicable Federal regulations. 42 U.S.C. 7410(k); 40 CFR " 

52.02(a) . Thus, in reviewing SIP submissions, EPA's role is to approve state choices, provided 

that they meet the criteria of the CAA. Accordingly, this action merely corrects an error, and 

does not impose additional requirements beyond those imposed by state law. For that reason, 

this action : 

" is not a "significant regulatory action" subject to review by the Office of Management 

and Budget under Executive Order 12866 (58 FR 51735, October 4, 1993); 

" does not impose an information collection burden under the provisions of the Paperwork 

Reduction Act (44 U.S.C. 3501 et seq.) ; 

" is certified as not having a significant economic impact on a substantial number of small 

entities under the Regulatory Flexibility Act (5 U.S .C . 601 et seq.) ; 

" does not contain any unfunded mandate or significantly or uniquely affect small 

governments, as described in the Unfunded Mandates Reform Act of 1995 (Public Law 

104-4) ; 

" does not have Federalism implications as specified in Executive Order 13132 (64 FR 

43255, August 10, 1999) ; 

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" is not an economically significant regulatory action based on health or safety risks subject 

to Executive Order 13045 (62 FR 19885, April 23, 1997); 

" is not a significant regulatory action subject to Executive Order 13211 (66 FR 28355, 

May 22, 2001); 

" is not subject to requirements of Section 12(d) of the National Technology Transfer and 

Advancement Act of 1995 (1-5 U.S .C . 272 note) because application of those 

requirements would be inconsistent with the CAA; and 

" does not provide EPA with the discretionary authority to address, as appropriate, 

disproportionate human health or .environmental effects, using practicable and legally 

permissible methods, under Executive Order 12898 (59 FR 7629, February 16, 1994). 

In addition, this rule does not have tribal implications as specified by Executive Order 

13175 (65 FR 67249, November 9, 2000), because the SIP is not approved to apply in Indian 

country located in the state, and EPA notes that it will not impose substantial direct costs on 

tribal governments or preempt tribal law. 

The Congressional Review Act, 5 U.S.C. 801 et seq., as added by the Small Business 

Regulatory Enforcement Fairness Act of 1996, generally provides that before a rule may take 

effect, the agency promulgating the rule must submit a rule report, which includes a copy of the 

rule, to each House of the Congress and to the Comptroller General of the United States . EPA 

will submit a report containing this action and other required information to the U.S . Senate, the 

U.S . House of Representatives, and the Comptroller General of the United States prior to 

publication of the rule in the Federal Register. A major rule cannot take effect until 60 days after 

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it is published in the Federal Register . This action is not a "major rule" as defiined by 5 U.S .C . 

804(2) . 

Under section 307(b)(1) of the CAA, petitions for judicial review of this action must be 

filed in the United States Court of Appeals for the appropriate circuit by [FEDERAL REGISTER 

OFFICE: insert date 60 days from date of publication of this document in the Federal Register 

Filing a petition for reconsideration by the Administrator of this final rule does not affect the 

finality of this action for the purposes of judicial review nor does it extend the time within which 

a petition for judicial review may be filed, and shall not postpone the effectiveness of such rule 

or action . This action may not be challenged later in proceedings to enforce its requirements . 

(See, section 307(b)(2).) 
List of Subjects in 40 CFR Part 52 

Environmental protection, Air pollution control, Carbon monoxide, Lead, Nitrogen 

dioxide, Ozone, Particulate matter, Sulfur oxides, Volatile organic compounds. 

Dated: 

JAN ' 4 2010 

Jan 4, 2010 

Acting Regional Administrator, 

Region 4 
40 CFR part 52 is amended as follows : 

PART 52--[AMENDED] 

1. The authority citation for part 52 continues to read as follows : 

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

Subpart S - Kentucky 

2. In § 52.920(c) Table 1 is amended under Chapter 63 - General Standards of Performance by 

removing the entry for "401 KAR 63 :020" "Potentially hazardous matter or toxic substances".