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Federal Register / Vol. 86, No. 5 / Friday, January 8, 2021 / Proposed Rules demographic and economic growth projections provided by Arizona Department of Administration and the Maricopa Association of Governments MAG.19
In general, the term point sources typically refers to permitted facilities that have one or more identified and fixed pieces of equipment and emissions points. Area sources typically consist of widespread and numerous smaller emissions sources, such as small permitted facilities and households. The mobile sources category refers to vehicles and is typically divided into two major subcategories, on-road and nonroad mobile sources. On-road mobile sources include light-duty automobiles, light-, medium-, and heavy-duty trucks, and motorcycles. In addition to tailpipe, brake, and tire wear, on-road mobile emissions estimates for PM10 also include re-entrained dust from vehicles driven on paved and unpaved roads.
Non-road mobile sources include aircraft and related support vehicles, locomotives, construction equipment, agricultural equipment, mobile equipment, and recreational vehicles.
In the West Pinal County PM10 Plan, the State based the point source emissions for the 2008 base year emissions inventory on reported data from facilities using the permit file reporting programs of the Pinal County Air Quality Control District PCAQCD.
Area sources, as noted above, include smaller emissions sources distributed across the nonattainment area. ADEQ
estimated emissions for area sources using established inventory methods, including publicly available emissions factors and activity information. The State derived activity data from national survey data, such as the Energy Information Administration or from local sources and PCAQCD databases.
Emissions factors used for the estimates come from many sources, such as facility and equipment source tests, compliance reports, and the EPAs compilation of emissions factors document known as AP42.
ADEQ calculated the 2008 base year on-road emissions inventories in the West Pinal PM10 Plan using the MOVES2014 model and a back-casting of 2015 modeling of vehicle travel activity data provided by MAG.20 ADEQ
estimated emissions inventories for nonroad equipment using the EPAs NONROAD Model, including construction and mining equipment, industrial and commercial equipment, 19 West Pinal County PM
10 Plan, 2728, Table 3
3; Appendix B, 120, 132, and 132 at footnote 97.
20 Appendix B, 6275.

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lawn and garden equipment, agricultural equipment, and recreational vehicles.21 Locomotive emissions were estimated from EPA published emission factors and local track-mileage, train speed, and throughput data.22 The State developed aircraft and related ground support vehicle emissions estimates in conjunction with activity data from local airports in the region.
As described previously, the State grouped direct PM10 emissions estimates in the West Pinal County PM10
Plan into two general categories and emissions inventories, windblown dust and human activity-based emissions; 23
we present these inventories in Tables 1 and 2, respectively. In general, emission inventories can be broken into four basic categories: Stationary sources, area sources, non-road sources and mobile sources. Instead of a summary emissions inventory consisting of these four general categories, ADEQ provided a more detailed 2008 base year emissions inventory. In some cases, a source category will appear in both emissions inventories and tables. For example, an unpaved road and an agricultural field will emit PM10 when wind speeds become high enough to pick up and carry disturbed earth, as well as due to vehicle and equipment traffic on the unpaved road or agricultural activity in a field, such as harvesting or tilling.

TABLE 1WEST PINAL COUNTY PM10
PLAN, WINDBLOWN DUST/FUGITIVE
EMISSIONS INVENTORY
Tons per year Source category Developed Urban Lands
Developed Rural Lands
Unpaved Roads
Cleared Areas
Residential Construction
Dairies
CAFOs
Desert Shrubland
Agriculture
Commercial Construction
Other
Site Development

2008
base year 200.7
1,959.7
4,688.6
398.1
1,302.4
449.6
273.7
38,276.7
19,510.1
686.4
4,243.9
858.7

1351

out into permitted sources and fuel combustion. Area sources are disaggregated into several source categories: Fires, open burning, unpaved parking, and construction sites and activities. Agricultural sources are also disaggregated into several source categories: on field harvesting, on field tilling, confined animal feed operations CAFOs, and dairies. In contrast, mobile sources are included within the unpaved roads and paved roads source categories. Each of these two source categories aggregate direct vehicle exhaust, tire and brake wear and fugitive PM10 emissions from motor vehicles on unpaved and paved roads.
Finally, nonroad equipment and railroad emissions are assigned to their own respective source categories.

TABLE 2WEST PINAL COUNTY PM10
PLAN, HUMAN
ACTIVITY-BASED
EMISSIONS INVENTORY
Tons per year Source category
2008
base year
Ag FieldsHarvesting
Ag FieldsTilling
CAFOs
Paved Road
Unpaved RoadAll Road Types
Fuel Combustion
Fires
Open Burning
Nonroad
Railroad
Construction
Dairy
Permitted Sources
Unpaved Parking

312.9
2,540.3
2,614.3
1,180.7
45,127.8
28.3
19.9
13.6
121.3
85.9
12,955.3
186.6
781.3
251.5

Total

66,219.7

Source: West Pinal County PM10 Plan, Table 53; Appendix B, Tables 531, 533.
Paved and Unpaved Road emissions estimates include direct vehicle emissions and fugitive dust emissions from vehicle reentrainment.

Tables 1 and 2 provide a summary of the West Pinal County 2008 base year direct PM10 emissions in tons per year.
Appendix B, Chapters 3 and 5 also provide source category estimates in a pounds per day format consistent with the 24-hour PM10 NAAQS. Where Total
72,848.6 appropriate, within the attainment Source: West Pinal County PM10 Plan, demonstration, ADEQ used these daily estimates or developed more focused Table 53; Appendix B, Tables 531, 533.
daily emissions estimates to provide the Table 2 presents ADEQs direct PM10
basis for the control measure analysis emissions inventory related to human and the modeled attainment activity. Stationary sources are broken demonstrations in the West Pinal County PM10 Plan.24 Within the 21 Appendix B, 8790. EPA NONROAD Model, windblown PM10 emissions inventory, Version 2008a, released July 2009.
the largest source after desert shrubland 22 Appendix B, 96.
23 Tables 51, 52, and 53, West Pinal County PM10 Plan.

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24 Appendix
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08JAP1

B, chapters 3 and 5.