Availability of Additional Information for the Proposed Rulemaking for Colorado's Attainment Demonstration for the 1997 8-Hour Ozone Standard and Related Revisions, 78950-78952 [2010-31738]

Download as PDF 78950 Federal Register / Vol. 75, No. 242 / Friday, December 17, 2010 / Proposed Rules I. Background This SIP revision proposes to replace, in its entirety, the SIP version of 45CSR14, as approved by EPA on December 4, 2006 (71 FR 64470), with West Virginia’s current version of this rule. West Virginia 45 CSR14 governs the permitting for the construction of new major stationary sources and the significant modification of existing major stationary sources of air pollutants in areas designated attainment or non-classifiable for the National Ambient Air Quality Standards (NAAQS). This regulatory revision was made effective as a legislative rule by the State of West Virginia on June 1, 2009. srobinson on DSKHWCL6B1PROD with PROPOSALS II. Summary of SIP Revision West Virginia’s rule 45CSR14 establishes a pre-construction permit program consistent with Title I of the CAA and the implementing regulations at 40 CFR 51.166 ‘‘Prevention of Significant Deterioration of Air Quality.’’ West Virginia rule 45CSR14 also ensures that the West Virginia SIP provides for the attainment and maintenance of the National Ambient Air Quality Standards (NAAQS) in accordance with Section 110(a)(2)(C) of the CAA which requires States to have a permitting program for regulation of the construction and modification of sources as required by Part C of Title I of the CAA to assure NAAQS are achieved. On November 29, 2005, NOX were established as precursors to the criteria pollutant ozone and became regulated under 40 CFR 51.166 and 40 CFR 52.21 (70 FR 71612). The new version of 45CSR14 establishes NOX as a precursor to ozone to satisfy these requirements. The new version of 45CSR14 also deletes references to pollution control projects (PCPs) and clean units (CUs) to make the West Virginia’s regulation consistent with the Federal PSD regulations. The provisions of the State’s rule at 45CSR14.19.8 now include the recordkeeping and reporting requirements for sources that elect to use the actual-to-projected actual emission test and where there is a ‘‘reasonable possibility’’ that a project may result in a significant net emissions increase. In our previous approval of 45CSR14, dated December 4, 2006 (71 FR 64470), at the request of West Virginia, we took no action on the provisions of 45CSR14.19.8 pertaining to the recordkeeping and reporting requirements for sources that elect to use the actual-to-projected actual emission test and where there is a VerDate Mar<15>2010 16:28 Dec 16, 2010 Jkt 223001 ‘‘reasonable possibility’’ that a project may result in a significant net emissions increase. We are now proposing to approve 45CSR14.19.8 as a revision to the West Virginia SIP because the necessary regulatory corrections have been made. We are proposing approval of West Virginia’s July 20, 2009 SIP revision because we believe that the amendments to West Virginia’s PSD permit program at 45CSR14 as described herein meet the minimum requirements of 40 CFR 51.166 and the CAA. Aside from the changes described herein, no other changes to the West Virginia SIP’s PSD program as approved by EPA on December 4, 2006 (71 FR 64470) would result from this revision to replace the version of 45CSR14 in the West Virginia SIP. III. Proposed Action We are proposing to approve the West Virginia SIP’s July 20, 2009 SIP revision to replace 45CSR14 in its entirety. We are soliciting public comments on the issues discussed in this document. These comments will be considered before taking final action. IV. Statutory and Executive Order Reviews Under the CAA, the Administrator is required to approve a SIP submission that complies with the provisions of the CAA 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 proposes to approve state law as meeting Federal requirements and does not impose additional requirements beyond those imposed by state law. For that reason, this proposed 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 (Pub. L. 104–4); • Does not have Federalism implications as specified in Executive PO 00000 Frm 00019 Fmt 4702 Sfmt 4702 Order 13132 (64 FR 43255, August 10, 1999); • 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 (15 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 proposed rule to approve replacing the current SIPapproved version of West Virginia rule 45CSR14 in its entirety with an updated version to satisfy the CAA’s requirements for the Prevention of Significant Deterioration 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. List of Subjects in 40 CFR Part 52 Environmental protection, Air pollution control, Carbon monoxide, Incorporation by reference, Intergovernmental relations, Lead, Nitrogen dioxide, Ozone, Particulate matter, Reporting and recordkeeping requirements, Sulfur oxides, Volatile organic compounds. Authority: 42 U.S.C. 7401 et seq. Dated: December 7, 2010. Shawn M. Garvin, Regional Administrator, Region III. [FR Doc. 2010–31796 Filed 12–16–10; 8:45 am] BILLING CODE 6560–50–P ENVIRONMENTAL PROTECTION AGENCY 40 CFR Part 52 [EPA–R08–OAR–2010–0285; FRL–9239–9] Availability of Additional Information for the Proposed Rulemaking for Colorado’s Attainment Demonstration for the 1997 8-Hour Ozone Standard and Related Revisions Environmental Protection Agency (EPA). AGENCY: E:\FR\FM\17DEP1.SGM 17DEP1 Federal Register / Vol. 75, No. 242 / Friday, December 17, 2010 / Proposed Rules ACTION: Notice of data availability. This document announces the availability of revised modeling that relates to EPA’s notice of proposed rulemaking for Colorado’s Attainment Demonstration for the 1997 8-hour Ozone Standard for the Denver Metro Area/North Front Range (DMA/NFR) nonattainment area and Related Revisions. The results of the modeling and the modeling files have been placed in the docket for this rulemaking. EPA is providing an opportunity to comment on the revised modeling. DATES: Comments must be received on or before January 18, 2011. ADDRESSES: Submit your comments identified by Docket ID Regulation Number EPA–R08–OAR–2010–0285 by one of the following methods: • Mail: Callie Videtich, Director, Air Program, Environmental Protection Agency (EPA), Region 8, Mailcode 8P– AR, 1595 Wynkoop Street, Denver, Colorado 80202–1129. • Hand Delivery: Callie Videtich, Director, Air Program, Environmental Protection Agency (EPA), Region 8, Mailcode 8P–AR, 1595 Wynkoop Street, Denver, Colorado 80202–1129. Such deliveries are only accepted Monday through Friday, 8 a.m. to 4:30 p.m., excluding Federal holidays. Special arrangements should be made for deliveries of boxed information. • E-mail: komp.mark@epa.gov. • Fax: (303) 312–6064 (please alert the individual listed in the FOR FURTHER INFORMATION CONTACT if you are faxing comments). Instructions: Direct your comments to Docket ID No. EPA–R08–OAR–2010– 0285. EPA’s policy is that all comments received will be included in the public docket without change and may be made available online at https:// www.regulations.gov, including any personal information provided, unless the comment includes information claimed to be Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Do not submit information that you consider to be CBI or otherwise protected through https:// www.regulations.gov or e-mail. The https://www.regulations.gov Web site is an ‘‘anonymous access’’ system, which means EPA will not know your identity or contact information unless you provide it in the body of your comment. If you send an e-mail comment directly to EPA, without going through https:// www.regulations.gov your e-mail address will be automatically captured and included as part of the comment that is placed in the public docket and made available on the Internet. If you srobinson on DSKHWCL6B1PROD with PROPOSALS SUMMARY: VerDate Mar<15>2010 16:28 Dec 16, 2010 Jkt 223001 submit an electronic comment, EPA recommends that you include your name and other contact information in the body of your comment and with any disk or CD–ROM you submit. If EPA cannot read your comment due to technical difficulties and cannot contact you for clarification, EPA may not be able to consider your comment. Electronic files should avoid the use of special characters, any form of encryption, and be free of any defects or viruses. For additional instructions on submitting comments, go to Section I. General Information of the SUPPLEMENTARY INFORMATION section of this document. Docket: All documents in the docket are listed in the https:// www.regulations.gov index. Although listed in the index, some information is not publicly available, e.g., CBI or other information whose disclosure is restricted by statute. Certain other material, such as copyrighted material, will be publicly available only in hard copy. Publicly available docket materials are available either electronically in https:// www.regulations.gov or in hard copy at the Air Program, Environmental Protection Agency (EPA), Region 8, 1595 Wynkoop Street, Denver, Colorado 80202–1129. EPA requests that if at all possible, you contact the individual listed in the FOR FURTHER INFORMATION CONTACT section to view the hard copy of the docket. You may view the hard copy of the docket Monday through Friday, 8 a.m. to 4 p.m., excluding Federal holidays. FOR FURTHER INFORMATION CONTACT: Mark Komp, Air Program, 1595 Wynkoop Street, Mailcode: 8P–AR, Denver, Colorado 80202–1129, (303) 312–6022, komp.mark@epa.gov. SUPPLEMENTARY INFORMATION: Table of Contents I. General Information II. Notice of Data Availability Definitions For the purpose of this document, the following definitions apply: (i) Act or CAA means or refers to the Clean Air Act, unless the context indicates otherwise. (ii) EPA, we, us or our means or refers to the United States Environmental Protection Agency. (iii) SIP means or refers to State Implementation Plan. (iv) ppb means parts per billion of ozone in air. (v) State or Colorado means the State of Colorado, unless the context indicates otherwise. PO 00000 Frm 00020 Fmt 4702 Sfmt 4702 78951 (vi) NAAQS means or refers to National Ambient Air Quality Standards. (vii) NODA means or refers to Notice of Data Availability. I. General Information A. What should I consider as I prepare my comments for EPA? 1. Submitting CBI. Do not submit this information to EPA through https:// regulations.gov or e-mail. Clearly mark the part or all of the information that you claim to be CBI. For CBI information in a disk or CD–ROM that you mail to EPA, mark the outside of the disk or CD–ROM as CBI and then identify electronically within the disk or CD–ROM the specific information that is claimed as CBI. In addition to one complete version of the comment that includes information claimed as CBI, a copy of the comment that does not contain the information claimed as CBI must be submitted for inclusion in the public docket. Information so marked will not be disclosed except in accordance with procedures set forth in 40 CFR part 2. 2. Tips for Preparing Your Comments. When submitting comments, remember to: • Identify the rulemaking by docket number and other identifying information (subject heading, Federal Register date and page number). • Follow directions—The agency may ask you to respond to specific questions or organize comments by referencing a Code of Federal Regulations (CFR) part or section number. • Explain why you agree or disagree; suggest alternatives and substitute language for your requested changes. • Describe any assumptions and provide any technical information and/ or data that you used. • If you estimate potential costs or burdens, explain how you arrived at your estimate in sufficient detail to allow for it to be reproduced. • Provide specific examples to illustrate your concerns, and suggest alternatives. • Explain your views as clearly as possible, avoiding the use of profanity or personal threats. • Make sure to submit your comments by the comment period deadline identified. II. Notice of Data Availability On June 18, 2009, Colorado submitted revisions to the Colorado SIP for the 1997 8-hour ozone NAAQS for the DMA/NFR nonattainment area. The revisions included a modeled attainment demonstration using E:\FR\FM\17DEP1.SGM 17DEP1 srobinson on DSKHWCL6B1PROD with PROPOSALS 78952 Federal Register / Vol. 75, No. 242 / Friday, December 17, 2010 / Proposed Rules photochemical grid modeling that the State conducted in 2008. (Photochemical grid modeling is used to project future 8-hour ozone Design Values for comparison to the 85.0 ppb ozone NAAQS.) On July 21, 2010, we proposed to act on the State’s revisions and as part of that action, proposed to approve Colorado’s attainment demonstration and certain other aspects of the revisions, and proposed to disapprove other aspects of the revisions. For further information on Colorado’s submittal and our proposed action, please consult the Federal Register (July 21, 2010; 75 FR 42346). On October 7, 2010, Colorado submitted revised photochemical modeling results to us for the DMA/NFR ozone SIP. Colorado re-ran the photochemical model because in September 2010 the State discovered that errors had been made in specifying the location of certain point sources in the 2008 modeling. Latitude/longitude locations for some point sources in the original modeling effort were mistakenly derived using the degreeminute-second coordinate system rather than the correct decimal degree coordinate system. As a result, some point source locations were displaced in the grid-coordinate system used by the model. Thus, Colorado re-ran the model with the correct coordinates to determine whether the errors made in locating some point sources affected the reliability of the model results. The projected Design Values for 2010 resulting from the revised modeling remain below the 85.0 ppb ozone NAAQS. For the SIP’s 2010 base case, the revised modeling’s maximum projected 8-hour ozone Design Values are found at the Rocky Flats North and Fort Collins West monitoring sites—84.7 ppb ozone at both locations in 2010. This is 0.2 ppb lower than the State’s 2008 modeling projected using incorrect point source locations. Because it produced slightly lower values at the monitoring sites with maximum Design Values, the revised modeling supports the conclusions that EPA proposed regarding the 2008 modeling. With this Notice of Data Availability, we are providing an opportunity for the public to comment on Colorado’s October 2010 revised modeling, including comments on how it may affect EPA’s proposed determinations as reflected in our July 21, 2010 proposal. We are not re-opening the comment period on the material that was before the Agency at the time of the July 21, 2010 proposal. Colorado’s October 2010 revised modeling is reflected in the following VerDate Mar<15>2010 16:28 Dec 16, 2010 Jkt 223001 two documents, which we have added to the rulemaking docket: 1. Final 2010 Ozone Attainment Demonstration Modeling for the Denver 8Hour Ozone State Implementation Plan. Docket Number: EPA–R08–OAR–2010–0285– 0025. 2. MEMORANDUM, October 7, 2010: ENVIRON: Denver Final 2010 Ozone Attainment Demonstration Modeling using Correct Point Source Locations. Docket Number: EPA–R08–OAR–2010–0285–0043. We will take final action based on our notice of proposed rulemaking that was published in the Federal Register on July 21, 2010 (75 FR 42346), the comments we received on that proposal, Colorado’s October 2010 revised modeling, and any comments we receive in response to this NODA. List of Subjects in 40 CFR Part 52 Environmental protection, Air pollution control, Carbon monoxide, Incorporation by Reference, Intergovernmental relations, Lead, Nitrogen dioxide, Ozone, Particulate matter, Reporting and recordkeeping requirements, Sulfur oxides, Volatile organic compounds. Dated: December 10, 2010. Carol Rushin, Deputy Regional Administrator, Region 8. [FR Doc. 2010–31738 Filed 12–16–10; 8:45 am] BILLING CODE 6560–50–P ENVIRONMENTAL PROTECTION AGENCY 40 CFR Part 62 [EPA–R03–OAR–2010–0859; FRL–9240–3] Approval and Promulgation of State Air Quality Plans for Designated Facilities and Pollutants; Commonwealth of Virginia; Control of Emissions From Existing Hospital/ Medical/Infectious Waste Incinerator (HMIWI) Units, Negative Declaration and Withdrawal of EPA Plan Approval Environmental Protection Agency (EPA). ACTION: Proposed rule. AGENCY: EPA proposes to approve the Commonwealth of Virginia’s negative declaration and request for EPA withdrawal of its section 111(d)/129 plan (the plan) approval for HMIWI units. Submittal of a negative declaration or State plan revision is a requirement of the Clean Air Act (CAA). In the Final Rules section of this Federal Register, EPA is approving the Commonwealth of Virginia’s negative declaration and request for EPA withdrawal of its plan approval for SUMMARY: PO 00000 Frm 00021 Fmt 4702 Sfmt 4702 HMIWI units. A detailed rationale for the approval is set forth in the direct final rule. If no adverse comments are received in response to this action, no further activity is contemplated. If EPA receives adverse comments, the direct final rule will be withdrawn and all public comments received will be addressed in a subsequent final rule based on this proposed rule. EPA will not institute a second comment period. Any parties interested in commenting on this action should do so at this time. DATES: Comments must be received in writing by January 18, 2011. ADDRESSES: Submit your comments, identified by Docket ID Number EPA– R03–OAR–2010–0859 by one of the following methods: A. https://www.regulations.gov. Follow the on-line instructions for submitting comments. B. E-mail: E-mail: wilkie.walter@epa.gov. C. Mail: EPA–R03–OAR–2010–0859, Walter K. Wilkie, Associate Director, Air Protection, Division, Office of Air Monitoring and Analysis, Mailcode 3AP40, U.S. Environmental Protection Agency, Region III, 1650 Arch Street, Philadelphia, Pennsylvania 19103. D. Hand Delivery: At the previouslylisted EPA Region III address. Such deliveries are only accepted during the Docket’s normal hours of operation, and special arrangements should be made for deliveries of boxed information. Instructions: Direct your comments to Docket ID No. EPA–R03–OAR–2010– 0859 EPA’s policy is that all comments received will be included in the public docket without change, and may be made available online at https:// www.regulations.gov, including any personal information provided, unless the comment includes information claimed to be Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Do not submit information that you consider to be CBI or otherwise protected through https:// www.regulations.gov or e-mail. The https://www.regulations.gov Web site is an ‘‘anonymous access’’ system, which means EPA will not know your identity or contact information unless you provide it in the body of your comment. If you send an e-mail comment directly to EPA without going through https:// www.regulations.gov, your e-mail address will be automatically captured and included as part of the comment that is placed in the public docket and made available on the Internet. If you submit an electronic comment, EPA recommends that you include your name and other contact information in E:\FR\FM\17DEP1.SGM 17DEP1

Agencies

[Federal Register Volume 75, Number 242 (Friday, December 17, 2010)]
[Proposed Rules]
[Pages 78950-78952]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2010-31738]


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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 52

[EPA-R08-OAR-2010-0285; FRL-9239-9]


Availability of Additional Information for the Proposed 
Rulemaking for Colorado's Attainment Demonstration for the 1997 8-Hour 
Ozone Standard and Related Revisions

AGENCY: Environmental Protection Agency (EPA).

[[Page 78951]]


ACTION: Notice of data availability.

-----------------------------------------------------------------------

SUMMARY: This document announces the availability of revised modeling 
that relates to EPA's notice of proposed rulemaking for Colorado's 
Attainment Demonstration for the 1997 8-hour Ozone Standard for the 
Denver Metro Area/North Front Range (DMA/NFR) nonattainment area and 
Related Revisions. The results of the modeling and the modeling files 
have been placed in the docket for this rulemaking. EPA is providing an 
opportunity to comment on the revised modeling.

DATES: Comments must be received on or before January 18, 2011.

ADDRESSES: Submit your comments identified by Docket ID Regulation 
Number EPA-R08-OAR-2010-0285 by one of the following methods:
     Mail: Callie Videtich, Director, Air Program, 
Environmental Protection Agency (EPA), Region 8, Mailcode 8P-AR, 1595 
Wynkoop Street, Denver, Colorado 80202-1129.
     Hand Delivery: Callie Videtich, Director, Air Program, 
Environmental Protection Agency (EPA), Region 8, Mailcode 8P-AR, 1595 
Wynkoop Street, Denver, Colorado 80202-1129. Such deliveries are only 
accepted Monday through Friday, 8 a.m. to 4:30 p.m., excluding Federal 
holidays. Special arrangements should be made for deliveries of boxed 
information.
     E-mail: komp.mark@epa.gov.
     Fax: (303) 312-6064 (please alert the individual listed in 
the FOR FURTHER INFORMATION CONTACT if you are faxing comments).
    Instructions: Direct your comments to Docket ID No. EPA-R08-OAR-
2010-0285. EPA's policy is that all comments received will be included 
in the public docket without change and may be made available online at 
https://www.regulations.gov, including any personal information 
provided, unless the comment includes information claimed to be 
Confidential Business Information (CBI) or other information whose 
disclosure is restricted by statute. Do not submit information that you 
consider to be CBI or otherwise protected through https://www.regulations.gov or e-mail. The https://www.regulations.gov Web site 
is an ``anonymous access'' system, which means EPA will not know your 
identity or contact information unless you provide it in the body of 
your comment. If you send an e-mail comment directly to EPA, without 
going through https://www.regulations.gov your e-mail address will be 
automatically captured and included as part of the comment that is 
placed in the public docket and made available on the Internet. If you 
submit an electronic comment, EPA recommends that you include your name 
and other contact information in the body of your comment and with any 
disk or CD-ROM you submit. If EPA cannot read your comment due to 
technical difficulties and cannot contact you for clarification, EPA 
may not be able to consider your comment. Electronic files should avoid 
the use of special characters, any form of encryption, and be free of 
any defects or viruses. For additional instructions on submitting 
comments, go to Section I. General Information of the SUPPLEMENTARY 
INFORMATION section of this document.
    Docket: All documents in the docket are listed in the https://www.regulations.gov index. Although listed in the index, some 
information is not publicly available, e.g., CBI or other information 
whose disclosure is restricted by statute. Certain other material, such 
as copyrighted material, will be publicly available only in hard copy. 
Publicly available docket materials are available either electronically 
in https://www.regulations.gov or in hard copy at the Air Program, 
Environmental Protection Agency (EPA), Region 8, 1595 Wynkoop Street, 
Denver, Colorado 80202-1129. EPA requests that if at all possible, you 
contact the individual listed in the FOR FURTHER INFORMATION CONTACT 
section to view the hard copy of the docket. You may view the hard copy 
of the docket Monday through Friday, 8 a.m. to 4 p.m., excluding 
Federal holidays.

FOR FURTHER INFORMATION CONTACT: Mark Komp, Air Program, 1595 Wynkoop 
Street, Mailcode: 8P-AR, Denver, Colorado 80202-1129, (303) 312-6022, 
komp.mark@epa.gov.

SUPPLEMENTARY INFORMATION:

Table of Contents

I. General Information
II. Notice of Data Availability

Definitions

    For the purpose of this document, the following definitions apply:
    (i) Act or CAA means or refers to the Clean Air Act, unless the 
context indicates otherwise.
    (ii) EPA, we, us or our means or refers to the United States 
Environmental Protection Agency.
    (iii) SIP means or refers to State Implementation Plan.
    (iv) ppb means parts per billion of ozone in air.
    (v) State or Colorado means the State of Colorado, unless the 
context indicates otherwise.
    (vi) NAAQS means or refers to National Ambient Air Quality 
Standards.
    (vii) NODA means or refers to Notice of Data Availability.

I. General Information

A. What should I consider as I prepare my comments for EPA?

    1. Submitting CBI. Do not submit this information to EPA through 
https://regulations.gov or e-mail. Clearly mark the part or all of the 
information that you claim to be CBI. For CBI information in a disk or 
CD-ROM that you mail to EPA, mark the outside of the disk or CD-ROM as 
CBI and then identify electronically within the disk or CD-ROM the 
specific information that is claimed as CBI. In addition to one 
complete version of the comment that includes information claimed as 
CBI, a copy of the comment that does not contain the information 
claimed as CBI must be submitted for inclusion in the public docket. 
Information so marked will not be disclosed except in accordance with 
procedures set forth in 40 CFR part 2.
    2. Tips for Preparing Your Comments. When submitting comments, 
remember to:
     Identify the rulemaking by docket number and other 
identifying information (subject heading, Federal Register date and 
page number).
     Follow directions--The agency may ask you to respond to 
specific questions or organize comments by referencing a Code of 
Federal Regulations (CFR) part or section number.
     Explain why you agree or disagree; suggest alternatives 
and substitute language for your requested changes.
     Describe any assumptions and provide any technical 
information and/or data that you used.
     If you estimate potential costs or burdens, explain how 
you arrived at your estimate in sufficient detail to allow for it to be 
reproduced.
     Provide specific examples to illustrate your concerns, and 
suggest alternatives.
     Explain your views as clearly as possible, avoiding the 
use of profanity or personal threats.
     Make sure to submit your comments by the comment period 
deadline identified.

II. Notice of Data Availability

    On June 18, 2009, Colorado submitted revisions to the Colorado SIP 
for the 1997 8-hour ozone NAAQS for the DMA/NFR nonattainment area. The 
revisions included a modeled attainment demonstration using

[[Page 78952]]

photochemical grid modeling that the State conducted in 2008. 
(Photochemical grid modeling is used to project future 8-hour ozone 
Design Values for comparison to the 85.0 ppb ozone NAAQS.) On July 21, 
2010, we proposed to act on the State's revisions and as part of that 
action, proposed to approve Colorado's attainment demonstration and 
certain other aspects of the revisions, and proposed to disapprove 
other aspects of the revisions. For further information on Colorado's 
submittal and our proposed action, please consult the Federal Register 
(July 21, 2010; 75 FR 42346).
    On October 7, 2010, Colorado submitted revised photochemical 
modeling results to us for the DMA/NFR ozone SIP. Colorado re-ran the 
photochemical model because in September 2010 the State discovered that 
errors had been made in specifying the location of certain point 
sources in the 2008 modeling. Latitude/longitude locations for some 
point sources in the original modeling effort were mistakenly derived 
using the degree-minute-second coordinate system rather than the 
correct decimal degree coordinate system. As a result, some point 
source locations were displaced in the grid-coordinate system used by 
the model. Thus, Colorado re-ran the model with the correct coordinates 
to determine whether the errors made in locating some point sources 
affected the reliability of the model results.
    The projected Design Values for 2010 resulting from the revised 
modeling remain below the 85.0 ppb ozone NAAQS. For the SIP's 2010 base 
case, the revised modeling's maximum projected 8-hour ozone Design 
Values are found at the Rocky Flats North and Fort Collins West 
monitoring sites--84.7 ppb ozone at both locations in 2010. This is 0.2 
ppb lower than the State's 2008 modeling projected using incorrect 
point source locations. Because it produced slightly lower values at 
the monitoring sites with maximum Design Values, the revised modeling 
supports the conclusions that EPA proposed regarding the 2008 modeling.
    With this Notice of Data Availability, we are providing an 
opportunity for the public to comment on Colorado's October 2010 
revised modeling, including comments on how it may affect EPA's 
proposed determinations as reflected in our July 21, 2010 proposal. We 
are not re-opening the comment period on the material that was before 
the Agency at the time of the July 21, 2010 proposal.
    Colorado's October 2010 revised modeling is reflected in the 
following two documents, which we have added to the rulemaking docket:

    1. Final 2010 Ozone Attainment Demonstration Modeling for the 
Denver 8-Hour Ozone State Implementation Plan. Docket Number: EPA-
R08-OAR-2010-0285-0025.
    2. MEMORANDUM, October 7, 2010: ENVIRON: Denver Final 2010 Ozone 
Attainment Demonstration Modeling using Correct Point Source 
Locations. Docket Number: EPA-R08-OAR-2010-0285-0043.

    We will take final action based on our notice of proposed 
rulemaking that was published in the Federal Register on July 21, 2010 
(75 FR 42346), the comments we received on that proposal, Colorado's 
October 2010 revised modeling, and any comments we receive in response 
to this NODA.

List of Subjects in 40 CFR Part 52

    Environmental protection, Air pollution control, Carbon monoxide, 
Incorporation by Reference, Intergovernmental relations, Lead, Nitrogen 
dioxide, Ozone, Particulate matter, Reporting and recordkeeping 
requirements, Sulfur oxides, Volatile organic compounds.

    Dated: December 10, 2010.
Carol Rushin,
Deputy Regional Administrator, Region 8.
[FR Doc. 2010-31738 Filed 12-16-10; 8:45 am]
BILLING CODE 6560-50-P
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