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Federal Register / Vol. 86, No. 30 / Wednesday, February 17, 2021 / Proposed Rules
Following our review, we have determined that IDEQ prepared an adequate attainment inventory for the Idaho portion of the Logan, UT-ID PM2.5
NAA.
In the September 13, 2019
submission, Idaho also provided inventory information for the Utah portion of the Logan, UT-ID NAA. Idaho derived this inventory from the Utah Division of Air Quality Utah DAQ, which performed a photochemical grid modeling analysis using the Comprehensive Air Quality Model with Extensions v. 6.3, http

www.camx.com/ modeling system for the nonattainment area for Utahs attainment, interim, and projected years.
Utah used linear projections to estimate future years to 2035. Utah DAQs modeling domain included all three of the nonattainment areas in UT and extended into southern Idaho to include the Idaho portion of the Logan UT-ID
PM2.5 NAA. The methodology for the mobile, nonroad and area source emissions inventories can be found in the Utah DAQ PM2.5 Emissions Inventory Preparation Plan Utah DAQ
2019, in the docket for this action.

IDEQ interpolated the Utah DAQ
projections to 2031 using the average annual growth rate for area, mobile, and nonroad sources to match the 2031
horizon year for Idahos redesignation request. The actual and projected emissions in the Utah portion of the Logan UT-ID PM2.5 NAA are provided in Table 4 of this document. Table 5 of this document provides Idahos projected emissions inventories for the entire Logan UT-ID PM2.5 NAA, which is the combination of the values in Tables 3
and 4 of this document.

TABLE 4UTAH PORTION OF THE LOGAN, UT-ID PM2.5 NAA; ACTUAL EMISSIONS FROM 2017 AND PROJECTED
EMISSIONS FOR 2026 AND 2031
Pounds per average episodic winter day.
Year
Source category
PM2.5
condensable
2017
2017
2017

Area
Mobile
Nonroad

1.83

1,198.17
460
200

1,840
7,520
1,580

60
40

7,600
4,920
4,380

26,960
200

2017
2026
2026
2026

Total
Area
Mobile
Nonroad

1.83
2.09

1,858.17
1,277.91
260
120

10,940
1,400
3,040
1,180

100
60
20

16,900
7,760
2,780
2,540

27,160
26,540
180

2026
2031
2031
2031

Total
Area
Mobile
Nonroad

2.09
2.29

1,657.91
1,311.04
326.67
108.89

5,620
1,411.11
3,306.67
1,157.78

80
60
20

13,080
8,215.56
3,357.78
2,284.44

26,720
26,362.22
191.11

2031

Total

2.29

1,746.6

5,875.56

80

13,857.78

26,553.33

Projected change %

25.2

6.0

46.3

20

18.0

0.02

PM2.5
filterable
NOX

SO2

VOC

NH3

TABLE 5ENTIRE LOGAN, UT-ID PM2.5 NAA; ACTUAL EMISSIONS FROM 2017 AND PROJECTED EMISSIONS FOR 2026
AND 2031

jbell on DSKJLSW7X2PROD with PROPOSALS

Pounds per winter day Year
Source category
PM2.5
condensable
2017
2017
2017

Area
Mobile
Nonroad

11.55

1,406.94
587.3
242.48

2,178.76
8,477.7
1,866.57

88.27
41.94
0.76

9,226.45
5,821.24
5,569.08

27,828.63
213.76
0.66

2017
2026
2026
2026

Total
Area
Mobile
Nonroad

11.55
11.98

2,236.72
1,500.33
369.36
151.19

12,523.03
1,763.48
3,461.84
1,482.79

130.97
88.58
22
0.77

20,616.77
9,821.12
3,313.12
3,316.4

28,043.05
27,412.08
192.55
0.66

2026
2031
2031
2031

Total
Area
Mobile
Nonroad

11.98
12.26

2,020.88
1,541.06
437.21
138.73

6,708.11
1,788.33
3,603.94
1,464.52

111.35
88.75
22.05
.78

16,450.64
10,518.17
3,754.04
3,016.94

27,605.29
27,236.22
204.32
0.67

2031

Total

12.26

2,117

6,856.79

111.58

17,289.15

27,441.21

Projected change %

6.1

5.4

45.2

14.8

16.1

2.1

Based our review of the emissions inventories Idaho provided in its September 13, 2019 submittal, shown in Tables 3 through 5 of this document, we
VerDate Sep<11>2014

16:07 Feb 16, 2021

Jkt 253001

PM2.5
filterable
NOX

propose to find that Idaho prepared an
PO 00000

SO2

VOC

NH3

adequate attainment inventory for the Logan, UT-ID PM2.5 NAA.17
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