2011-6669. Approval and Promulgation of Implementation Plans and Designations of Areas for Air Quality Planning Purposes; Alabama, Georgia, and Tennessee: Chattanooga; Determination of Attaining Data for the 1997 Annual Fine Particulate Standards

AGENCY:

Environmental Protection Agency (EPA).

ACTION:

Proposed rule.

SUMMARY:

EPA is proposing to determine that the Chattanooga, Tennessee-Georgia, fine particulate (PM_2.5) nonattainment area (hereafter referred to as “the Chattanooga Area” or “Area”) has attained the 1997 annual average PM_2.5 National Ambient Air Quality Standards (NAAQS). The Chattanooga Area is comprised of Hamilton County in Tennessee, Catoosa and Walker Counties in Georgia, and a portion of Jackson County in Alabama. This proposed determination of attainment is based upon complete, quality-assured and certified ambient air monitoring data for the 2007-2009 period showing that the Area has monitored attainment of the 1997 annual PM_2.5 NAAQS. If EPA finalizes this proposed determination of attainment, the requirements for the Area to submit an attainment demonstration and associated reasonably available control measures (RACM), a reasonable further progress (RFP) plan, contingency measures, and other planning State Implementation Plan (SIP) revisions related to attainment of the standard shall be suspended so long as the Area continues to attain the annual PM_2.5 NAAQS.

DATES:

Comments must be received on or before April 21, 2011.

ADDRESSES:

Submit your comments, identified by Docket ID No. EPA-R04-OAR-2011-0084, by one of the following methods:

1. http://www.regulations.gov: Follow the on-line instructions for submitting comments.

2. E-mail: [e-mail].

3. Fax: [phone].

4. Mail: EPA-R04-OAR-2011-0084, 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.

5. Hand Delivery: 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. Such deliveries are only accepted during the Regional Office normal hours of operation, and special arrangements should be made for deliveries of boxed information. The Regional Office official hours of business are Monday through Friday, 8:30 a.m. to 4:30 p.m., excluding Federal holidays.

Instructions: Direct your comments to Docket ID No. EPA-R04-OAR-2011-0084. EPA's policy is that all comments received will be included in the public docket without change and may be made available online at http://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 through http://www.regulations.gov or e-mail, information that you consider to be CBI or otherwise protected. The http://www.regulations.gov website 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 http://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 information about EPA's public docket visit the EPA Docket Center homepage at http://www.epa.gov/​epahome/​dockets.htm.

Docket: All documents in the electronic docket are listed in the http://www.regulations.gov index. Although listed in the index, some information is not publicly available, i.e., 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 form. Publicly available docket materials are available either electronically at http://www.regulations.gov 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:

Joel Huey or Sara Waterson, 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. Mr. Huey may be reached by phone at [phone] or via electronic mail at [e-mail]. Ms. Waterson may be reached by phone at [phone] or via electronic mail at [e-mail].

SUPPLEMENTARY INFORMATION:

I. What action Is EPA taking?

II. What Is the background for this action?

III. Does the Chattanooga area meet the annual PM_2.5 NAAQS?

A. Criteria

B. Chattanooga Area Air Quality

IV. What Is the effect of this action?

V. Statutory and Executive Order Reviews

I. What action is EPA taking?

EPA is proposing to determine that the Chattanooga Area (comprised of Hamilton, Catoosa, and Walker Counties in their entireties and a portion of Jackson County) has attaining data for the 1997 annual PM_2.5 NAAQS.^[1] The proposal is based upon complete, quality-assured and certified ambient air monitoring data for the 2007-2009 monitoring period that shows the Area has monitored attainment of the 1997 annual PM_2.5 NAAQS. Available data for 2010 indicate attaining data for the 1997 annual PM_2.5 NAAQS.

II. What is the background for this action?

On July 18, 1997 (62 FR 36852), EPA established an annual PM_2.5 NAAQS at 15.0 micrograms per cubic meter (μg/m³) based on a 3-year average of annual mean PM_2.5 concentrations. At that time, EPA also established a 24-hour NAAQS of 65 μg/m³. See 40 CFR 50.7. On January 5, 2005 (70 FR 944), EPA published its air quality designations and classifications for the 1997 PM_2.5 NAAQS based upon air quality monitoring data from those monitors for calendar years 2001-2003. These designations became effective on April 5, 2005. The Chattanooga Area was designated nonattainment for the 1997 annual PM_2.5 NAAQS. See 40 CFR 81.301(Alabama), 40 CFR 81.311 (Georgia), and 40 CFR 81.343 (Tennessee).

On October 17, 2006 (71 FR 61144), EPA retained the 1997 annual PM_2.5 NAAQS at 15.0 μg/m³ based on a 3-year average of annual mean PM_2.5 concentrations, and promulgated a 24-hour NAAQS of 35 μg/m³ based on a 3-year average of the 98th percentile of 24-hour concentrations. On November 13, 2009, EPA designated the Chattanooga Area as attainment for the 2006 24-hour NAAQS (74 FR 58688). In that action, EPA also clarified the designations for the NAAQS promulgated in 1997, stating that the Chattanooga Area was designated as nonattainment for the annual NAAQS but attainment for the 24-hour NAAQS. Thus, today's action does not address attainment of either the 1997 or the 2006 24-hour NAAQS.

In response to legal challenges of the annual NAAQS promulgated in 2006, the U.S. Court of Appeals for the District of Columbia Circuit (DC Circuit) remanded this NAAQS to EPA for further consideration. See American Farm Bureau Federation and National Pork Producers Council, et al. v. EPA, 559 F.3d 512 (DC Cir. 2009). However, given that the 1997 and 2006 annual NAAQS are essentially identical, attainment of the 1997 annual NAAQS would also indicate attainment of the remanded 2006 annual NAAQS.

On April 25, 2007 (72 FR 20664), EPA promulgated its PM_2.5 Implementation Rule, codified at 40 CFR part 51, subpart Z, in which the Agency provided guidance for state and tribal plans to implement the 1997 PM_2.5 NAAQS. This rule, at 40 CFR 51.1004(c), specifies some of the regulatory consequences of attaining the NAAQS, as discussed below.

III. Does the Chattanooga area meet the annual PM_2.5 NAAQS?

A. Criteria

Today's rulemaking proposed to find that the Chattanooga Area is attaining the 1997 annual PM_2.5 NAAQS, and provides a basis for that final action. The Chattanooga Area is comprised of Hamilton, Catoosa, and Walker Counties in their entireties, and a portion of Jackson County.

Under EPA regulations at 40 CFR 50.7, the annual primary and secondary PM_2.5 NAAQS are met when the annual arithmetic mean concentration, as determined in accordance with 40 CFR part 50, Appendix N, is less than or equal to 15.0 µg/m³ at all relevant monitoring sites in the subject area.

B. Chattanooga Area Air Quality

EPA has reviewed the ambient air monitoring data for the Chattanooga Area in accordance with the provisions of 40 CFR part 50, Appendix N. All data considered have been quality-assured, certified, and recorded in EPA's Air Quality System (AQS) database. This review addresses air quality data collected in the 3-year period from 2007—2009.

The following table provides the annual average concentrations averaged over 2007—2009 at the sites in the Chattanooga Area. The Rossville site did not have complete data for 2007. As a result, data substitution was performed and is discussed in the technical support document (TSD) for this proposed rule. The annual design value for 2007-2009 for the Chattanooga Area is 12.7 µg/m^[3] , at the Siskin Drive site (47-065-4002).

Table 1.—Annual Average Concentrations in the Chattanooga Area

Site name	Site No.	Annual average concentration (μg/m3)
Tombras Avenue	47-065-0031	12.6
Soddy Daisy High School	47-065-1011	11.7
Siskin Drive	47-065-4002	12.7
Rossville	13-295-0002	2 12.3

A new roof was installed in June of 2007 at the Rossville site; therefore, no data were collected from June 12, 2007, through November 13, 2007. The pitched roof no longer supported ambient air monitors, which resulted in the establishment of a new monitoring location. Due to the shut-down, the Rossville site did not meet data completeness requirements for 2007. Data substitution was used to determine the attainment status of the Rossville site. The Georgia Environmental Protection Division (GA EPD) developed a weight-of-evidence approach ^[3] for an alternative method of data substitution. The analysis used data from Siskin Drive and Tombras Avenue sites to determine the attainment status of the Rossville site. EPA has determined that GA EPD successfully demonstrated a strong correlation between the PM_2.5 data from the Rossville site and two other sites. Additionally, EPA's Office of Air Quality Planning and Standards did an additional analysis on the correlation between the sites. Further discussion on the data substitution can be found in the TSD for this proposed rule. Data completeness requirements were met at the other monitors in the Area.

Determinations of attainment are based on the most recent three years of complete, quality-assured data. EPA also considers additional quality-assured data to the extent those data are available. In accordance with Appendix N and standard EPA practice, EPA's review of the data was centered on the three most recent years of complete data, 2007-2009. Appendix N does not explicitly provide for comparisons to the NAAQS involving partial years of data, because various seasons of the year reflect various influences on PM_2.5 concentrations, and a partial year's data may not be representative of values that would be determined from a full year's data set. Nevertheless, EPA examined data that are available to date. For the Area, the available data for 2010 in the AQS database are below the NAAQS; however, not all of the 2010 data have been reported and they are not yet certified. Based on data available in AQS through the third quarter of 2010, the Tombras site has a preliminary 2008-2010 design value of 11.7 µg/m³, the Soddy Daisy site has a preliminary 2008-2010 design value of 11.1 µg/m³, the Siskin Drive site has a preliminary 2008-2010 design value of 11.7 µg/m³, and the Rossville site has a preliminary design value of 10.9 µg/m³. These preliminary design values are consistent with continued attainment, and the complete 2008—2010 design values are expected to be below 15.0 µg/m³. On the basis of this review, EPA is proposing to determine that the Chattanooga Area has attained the 1997 annual PM_2.5 NAAQS, and is soliciting public comments on its proposed determination.

IV. What is the effect of this action?

If this proposed determination of attainment is made final, the requirements for the Chattanooga Area to submit an attainment demonstration and associated RACM, a RFP plan, contingency measures, and any other planning SIPs related to attainment of the 1997 annual PM_2.5 NAAQS would be suspended for so long as the Area continues to attain the PM_2.5 NAAQS. See 40 CFR 51.1004(c). Notably, as described below, any such determination would not be equivalent to the redesignation of the Area to attainment for the annual PM_2.5 NAAQS.

If this proposed rulemaking is finalized and EPA subsequently determines, after notice and comment rulemaking in the Federal Register, that the Area has violated the annual PM_2.5 NAAQS, the basis for the suspension of the specific requirements would no longer exist for the Chattanooga Area, and the Area would thereafter have to address the applicable requirements. See 40 CFR 51.1004(c).

Finalizing this proposed action would not constitute a redesignation of the Area to attainment of the annual PM_2.5 NAAQS under section 107(d)(3) of the Clean Air Act (CAA). Further, finalizing this proposed action does not involve approving maintenance plans for the Area as required under section 175A of the CAA, nor would it find that the Area has met all other requirements for redesignation. Even if EPA finalizes the proposed action, the designation status of the Chattanooga Area would remain nonattainment for the 1997 annual PM_2.5 NAAQS until such time as EPA determines that the Area meets the CAA requirements for redesignation to attainment and takes action to redesignate the Area.

This action is only a proposed determination of attainment that the Chattanooga Area has attained the 1997 annual PM_2.5 NAAQS. Today's action does not address the 24-hour PM_2.5 NAAQS.

If the Chattanooga Area continues to monitor attainment of the annual PM_2.5 NAAQS, the requirements for the Chattanooga Area to submit an attainment demonstration and associated RACM, a RFP plan, contingency measures, and any other planning SIPs related to attainment of the annual PM_2.5 NAAQS will remain suspended.

V. Statutory and Executive Order Reviews

This action proposes to make a determination of attainment based on air quality, and would, if finalized, result in the suspension of certain federal requirements, and it would 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 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 1997 annual average PM_2.5 NAAQS data determination for the Chattanooga Area 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
• Particulate matter
• Reporting and recordkeeping requirements

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

Dated: March 10, 2011.

A. Stanley Meiburg,

Acting Regional Administrator, Region 4.

Footnotes

1.  “1997 Annual NAAQS” refers to both the primary and secondary standards, which are identical.

2.  The Rossville site did not meet 75 percent data completeness for the 2007-2009 time period due to roof replacement and subsequent relocation of the monitor. Because the site passed data substitution analysis, the design value for the Area is the highest reading monitor, which is Tombras Avenue.

3.  For the Chattanooga analysis, the weight-of-evidence approach used was spatial averaging. The analysis can be found in the “Analysis of Rossville PM_2.5 Data” document provided by GA EPD on 5/5/2010. This document will be posted in the docket.