2017-04684. Adequacy Status of the Knoxville, TN 2006 24-Hour PM2.5

AGENCY:

Environmental Protection Agency (EPA).

ACTION:

Notice of adequacy.

SUMMARY:

The U.S. Environmental Protection Agency (EPA) is notifying the public that it has found that the motor vehicle emissions budgets (MVEBs) contained in the State Implementation Plan (SIP) revision pertaining to the Knoxville, Tennessee 2006 24-hour fine particulate matter (PM_2.5) nonattainment area adequate for transportation conformity purposes. This SIP revision was submitted to EPA on December 20, 2016, by the Tennessee Department of Environment and Conservation (TDEC) and requests that EPA redesignate the area to attainment for the 2006 24-hour PM_2.5 national ambient air quality standards (NAAQS), and that EPA approve a maintenance plan for the continued attainment of the Area. Knoxville's 2006 24-hour PM_2.5 nonattainment area (hereafter referred to as “the Knoxville Area”), for which MVEBs are established in this notice, is comprised of the entire counties of Anderson, Blount, Knox, and Loudon, as well as a portion of Roane County. On March 2, 1999, the United States Court of Appeals for the District of Columbia Circuit (D.C. Circuit) ruled that submitted SIPs cannot be used for transportation conformity determinations until EPA has affirmatively found that the MVEBs are adequate. As a result of EPA's finding, the Knoxville Area must use the MVEBs for future conformity determinations for 2006 24-hour PM_2.5 NAAQS.

DATES:

These MVEBs are effective March 27, 2017.

FOR FURTHER INFORMATION CONTACT:

Kelly Sheckler, U.S. Environmental Protection Agency, Region 4, Air Regulatory Management Section, 61 Forsyth Street SW., Atlanta, Georgia 30303. Ms. Sheckler can also be reached by telephone at [phone], or via electronic mail at [e-mail]. The finding is available at EPA's conformity Web site: http://www.epa.gov/​otaq/​stateresources/​transconf/​currsips.htm.

SUPPLEMENTARY INFORMATION:

This notice is simply an announcement of a finding that EPA has already made. EPA, Region 4, sent a letter to TDEC on February 15, 2017, stating that the MVEBs identified for Knoxville in Tennessee's maintenance SIP revision, submitted on December 20, 2016, are adequate and must be used for transportation conformity determinations in the Knoxville Area.

EPA posted the availability of the Knoxville Area MVEBs on EPA's Web site on December 22, 2016, as part of the adequacy process, for the purpose of soliciting comments. The adequacy comment period ran until January 23, 2017. During EPA's adequacy comment period, no comments were received on the Knoxville Area MVEBs. Through this notice, EPA is informing the public that these MVEBs are adequate for transportation conformity. This finding has also been announced on EPA's conformity Web site: http://www.epa.gov/​otaq/​stateresources/​transconf/​pastsips.htm. The adequate MVEBs are provided in Table 1 below:

Table 1—Knoxville, Tennessee 2006 24-Hour PM_2.5 MVEBs

[Tons per day or tpd]

	2014	2028
PM2.5	1.22	* 0.67
NOX	42.73	* 19.65
* This includes the available safety margin of 0.03 tpd for PM2.5 and 7.16 for NOX in 2028.

Transportation conformity is required by section 176(c) of the Clean Air Act. EPA's conformity rule, 40 CFR part 93, requires that transportation plans, programs, and projects conform to state air quality implementation plans and establishes the criteria and procedures for determining whether or not they do so. Conformity to a SIP means that transportation activities will not produce new air quality violations, worsen existing violations, or delay timely attainment of the NAAQS.

The criteria by which EPA determines whether a SIP's MVEBs are adequate for transportation conformity purposes are outlined in 40 CFR 93.118(e)(4). We have also described the process for determining the adequacy of submitted SIP budgets in our July 1, 2004 (69 FR 40004), final rulemaking entitled, “Transportation Conformity Rule Amendments for the New 8-Hour Ozone and PM_2.5 National Ambient Air Quality Standards and Miscellaneous Revisions for Existing Areas; Transportation Conformity Rule Amendments: Response to Court Decision and Additional Rule Changes.” Please note that an adequacy review is separate from EPA's completeness review, and it should not be used to prejudge EPA's ultimate approval of Tennessee's 2006 24-hour PM_2.5 SIP revision for the Knoxville Area. Even if EPA finds a budget adequate, the SIP revision could later be disapproved.

Within 24 months from the effective date of this notice, the transportation partners will need to demonstrate conformity to the new MVEBs, if the demonstration has not already been made, pursuant to 40 CFR 93.104(e). See 73 FR 4419 (January 24, 2008).

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

Dated: February 15, 2017.

Kenneth R. Lapierre,

Acting Regional Administrator, Region 4.