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Federal Register / Vol. 86, No. 30 / Wednesday, February 17, 2021 / Proposed Rules
PM2.5 NAA upon redesignation of the area to attainment.
CAA section 172c7 requires the SIP
to meet the applicable provisions of CAA section 110a2. As noted above, we find that the Idaho SIP meets the CAA section 110a2 applicable requirements for purposes of redesignation.
For purposes of redesignation to attainment for the 2006 24-hour PM2.5
NAAQS, EPA proposes to find that Idaho has met all the applicable SIP
requirements under part D of Title I of the CAA.

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3. Fully Approved SIP Under CAA
Section 110k As discussed in Sections III.B.1 and III.B.2 of this document, for purposes of redesignation to attainment for the 2006
24-hour PM2.5 NAAQS, EPA has fully approved all applicable requirements of Idahos SIP for the Idaho portion of the Logan UT-ID area in accordance with CAA section 110k. Therefore, EPA has fully approved all applicable requirements of the applicable implementation plan in accordance with CAA section 110k.
C. Improvement in Air Quality Due to Permanent and Enforceable Measures CAA section 107d3Eiii of the CAA provides that for an area to be redesignated to attainment, the Administrator must determine that the improvement in air quality is due to permanent and enforceable reductions in emissions resulting from implementation of the applicable implementation plan, implementation of applicable Federal air pollutant control regulations, and other permanent and enforceable reductions.
On December 14, 2012, IDEQ
submitted an attainment plan that addressed attainment planning requirements for the Idaho portion of the Logan UT-ID PM2.5 NAA. On December 24, 2014, the IDEQ submitted a supplement to the 2012 attainment plan that included additional analysis.
Idahos December 14, 2012, attainment plan submittal included residential wood combustion RWC ordinances, road-sanding agreements, and a wood stove change-out program to reduce emissions of PM2.5 in the Idaho portion of the Logan UT-ID PM2.5 NAA. Each of these programs is discussed in detail within this section. EPA approved the RWC ordinances and road sanding agreements into the Idaho SIP on March 25, 2014 79 FR 16201, making them federally enforceable. EPA approved Idahos evaluation of, and imposition of, RACM and RACT level controls on appropriate sources on January 4, 2017

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82 FR 729. This approval included approving the RWC ordinances and wood stove change-out program as meeting the RACM requirement.
The RWC ordinances approved as RACM on January 4, 2017, apply within Franklin County and all six Idaho cities on the Idaho side of the Logan UT-ID
PM2.5 NAA Franklin, Preston, Weston, Dayton, Clifton, and Oxford. EPA
determined in its approvals that these RWC ordinances achieved permanent and enforceable emissions reductions.
Key elements in the current RWC
ordinances include mandatory burn bans issued when PM2.5 has reached or is forecasted to reach 75 on the Air Quality Index AQI, which corresponds to a PM2.5 concentration of 23.3 mg/m3
and aligns with the RWC ordinances applicable within Cache County on the Utah side of the Logan UT-ID PM2.5
NAA. All RWC ordinances effective in Franklin County prohibit both open burning and the use of specified devices when an air quality alert is issued. The ordinances also prohibit the installation of non-EPA-certified devices. Each of the adopted ordinances bans open burning of any kind during burn ban days, bans the sale or installation of non-EPA certified devices in new or existing buildings, and prohibits the construction of any building for which a solid fuel burning device is the sole source of heat. In its December 14, 2012, attainment plan submittal, Idaho estimated that maximum reductions for this measure are 0.06 tons per day tpd direct PM2.5, 0.009 tpd nitrogen oxides NOX, and 0.078 tpd volatile organic compounds VOC.
In our March 25, 2014 action, EPA
also approved road sanding agreements between IDEQ, Franklin County Road and Bridge, and the Idaho Transportation Department IDT to reduce the contribution of primary PM2.5 from reentrained dust on paved roads. According to records submitted to Idaho and summarized in the submission, IDT used salt in 2014 409
tons, 2015 340 tons, and 2016 109
tons and did not use sand. Franklin County Road and Bridge historically used a 10:1 ratio of sand and salt;
however, in the Idaho attainment plan, Franklin County committed to use a 4:1
ratio of sand and salt when anti-skid treatment is required. Franklin County also agreed to apply brine when temperatures are above 22 F, a measure that further reduces the amount of sand required by approximately 50%. The City of Preston now uses a 2:1 ratio of sand and salt at an average of 700 tons total per year. In its SIP, IDEQ estimates that these road sanding commitments
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would lead to 0.10 tpd reduction in direct PM2.5 annually.
Finally, in its attainment plan, IDEQ
quantified the emission reduction benefits from three woodstove changeout programs on the Idaho side of the Logan UT-ID area. These programs were conducted in 20062007, 20112012, and 20132014. Accordingly, Idaho demonstrated in the submission that a total of 209 uncertified RWC devices have been changed-out since 2006. In addition, 39 stoves were removed and destroyed through Idahos Alternative Energy Device tax deduction program.
In total, 256 wood stoves have been changed out on the Idaho side of the Logan UT-ID NAA since 2006. As described in the supplemental 2014
attainment plan SIP submittal applying the appropriate temporal profile to convert to tons per day, Idaho stated these change-outs have led to permanent reductions of 0.05 tpd direct PM2.5, 0.003 tpd NOX, and 0.13 tpd VOC.11 These woodstove change-out programs achieved permanent and enforceable emissions reductions because the RWC ordinances banned the sale or installation of non-EPA certified devices in new or existing buildings in Franklin County jurisdictions.
IDEQ also noted that Utah adopted permanent and enforceable control measures into its SIP that have reduced PM2.5 and precursor emissions and led to the improvement in air quality in the Logan UT-ID PM2.5 NAA. IDEQ
specifically referenced area source rules 2015 reductions of 122 lbs/day NOX, 679 lbs/day PM2.5, 3,665 lbs/day VOC
and a vehicle and inspection and maintenance program 2015 reductions of 0.214 tons/day for NOX and 0.212
tons/day for VOC in the Utah portion of the Logan UT-ID NAA.12 IDEQ also referenced Federal measures, including the Tier 3 Motor Vehicle Emission and Fuel Standards Rule 79 FR 23414, as permanent and enforceable reductions leading to improvement in air quality, and ultimately to attainment, in the Logan UT-ID PM2.5 NAA.
Based on the foregoing evaluation of these control measures, EPA proposes to determine that the improvement in air quality is reasonably attributable to permanent and enforceable reductions in emissions resulting from implementation of the applicable implementation plan, implementation of applicable Federal air pollutant control regulations, and other permanent and enforceable reductions.
11 2014

attainment plan SIP submittal, Section
4.1.
12 See Idahos September 13, 2019 submittal at Section 5.2.

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