1.
"Access restriction" means restricting or
eliminating public access to noncropland with signs or physical
obstruction.
2.
"Aggregate cover" means gravel, concrete, recycled
road base, caliche, or other similar material applied to
non-cropland.
3.
"Artificial wind barrier" means a physical barrier
to the wind.
4.
"Bed row spacing" means increasing or decreasing the
size of a planting bed area to reduce the number of passes and soil disturbance
by increasing plant density.
5.
"Best management practice" means a technique
verified by scientific research, that on a case-by-case basis is practical,
economically feasible, and effective in reducing PM10
emissions from a regulated agricultural activity.
6.
"Chemical irrigation" means applying a fertilizer,
pesticide, or other agricultural chemical to cropland through an irrigation
system.
7.
"Combining tractor operations" means performing two
or more tillage, cultivation, planting, or harvesting operations with a single
tractor or harvester pass.
8.
"Commercial farm" means 10 or more contiguous acres
of land used for agricultural purposes within the boundary of the Yuma
PM10 nonattainment area.
9.
"Commercial farmer" means an individual, entity, or
joint operation in general control of a commercial farm.
10.
"Conservation irrigation" means the use of drips,
sprinklers, or underground lines to conserve water, and to reduce the weed
population, the need for tillage, and soil compaction.
11.
"Conservation tillage" means types of tillage that
reduce the number of passes and the amount of soil disturbance.
12.
"Cover crop" means plants or a green manure crop
grown for seasonal soil protection or soil improvement.
13.
"Critical area planting" means using trees, shrubs,
vines, grasses, or other vegetative cover on noncropland.
14.
"Cropland" means land on a commercial farm
that:
a.
Is within the time-frame of final harvest to plant
emergence;
b.
Has been tilled in a prior year and is suitable for
crop production, but is currently fallow; or
c.
Is a turn-row.
15.
"Cross-wind ridges" means soil ridges formed by a
tillage operation.
16.
"Cross-wind strip-cropping" means planting strips of
alternating crops within the same field.
17.
"Cross-wind vegetative strips" means herbaceous
cover established in one or more strips within the same field.
18.
"Equipment modification" means modifying
agricultural equipment to prevent or reduce particulate matter generation from
cropland.
19.
"Limited activity during a high-wind event" means
performing no tillage or soil preparation activity when the measured wind speed
at six feet in height is more than 25 mph at the commercial farm
site.
20.
"Manure application" means applying animal waste or
biosolids to a soil surface.
21.
"Mulching" means applying plant residue or other
material that is not produced onsite to a soil surface.
22.
"Multi-year crop" means a crop, pasture, or orchard
that is grown, or will be grown, on a continuous basis for more than one
year.
23.
"Night farming" means performing regulated
agricultural activities at night when moisture levels are higher and winds are
lighter.
24.
"Noncropland" means any commercial farmland
that:
a.
Is no longer used for agricultural
production;
b.
Is no longer suitable for production of
crops;
c.
Is subject to a restrictive easement or contract
that prohibits use for the production of crops; or
d.
Includes a private farm road, ditch, ditch bank,
equipment yard, storage yard, or well head.
25.
"Permanent cover" means a perennial vegetative cover
on cropland.
26.
"Planting based on soil moisture" means applying
water to soil before performing planting operations.
27.
"Precision farming" means use of satellite
navigation to calculate position in the field, to reduce overlap during field
operations, and allow operations to occur during nighttime and inclement
weather, thus generating less PM10.
28.
"Reduce vehicle speed" means operating farm vehicles
or farm equipment on unpaved farm roads at speeds not to exceed 20
mph.
29.
"Reduced harvest activity" means reducing the number
of harvest passes using a mechanized method to cut and remove crops from a
field.
30.
"Regulated agricultural activity" means a commercial
farming practice that may produce PM10 within the Yuma
PM10 nonattainment area.
31.
"Residue management" means managing the amount and
distribution of crop and other plant residues on a soil
surface.
32.
"Sequential cropping" means growing crops in a
sequence that minimizes the amount of time bare soil is exposed on a
field.
33.
"Surface roughening" means manipulating a soil
surface to produce or maintain clods.
34.
"Synthetic particulate suppressant" means a
manufactured product such as lignosulfate, calcium chloride, magnesium
chloride, and polyacrylamide, an emulsion of a petroleum product, and an enzyme
product that is used to control particulate matter.
35.
"Tillage and harvest" means any mechanical practice
that physically disturbs cropland or crops on a commercial
farm.
36.
"Tillage based on soil moisture" means applying
water to soil before or during tillage, or delaying tillage to coincide with
precipitation.
37.
"Timing of a tillage operation" means performing
tillage operations at a time that will minimize the soil's susceptibility to
generate PM10.
38.
"Transgenic crops" means the use of genetically
modified crops such as "herbicide ready" crops, which reduces the need for
tillage or cultivation operations, and reduces soil
disturbance.
39.
"Track-out control system" means a device to remove
mud or soil from a vehicle before the vehicle enters a paved public
road.
40.
"Tree, shrub, or windbreak planting" means providing
a woody vegetative barrier to the wind.
41.
"Watering" means applying water to
noncropland.
42.
"Yuma PM10 nonattainment
area" means the Yuma PM10 planning area as defined in 40
CFR 81.303, which is incorporated by reference in R18-2-210 .
The definitions in
R18-2-101 and the following
definitions apply to
R18-2-612.01:
1. "Access restriction" means reducing PM
emission by reducing the number of trips driven on unpaved operation and
maintenance and unpaved utility roads by restricting or eliminating public
access by the used of signs or physical obstruction at locations that
effectively control access to roads.
2. "Aggregate cover" means reducing PM
emissions, wind erosion and stabilizing soil by applying and maintaining
gravel, concrete, recycled road base, caliche, or other similar material to
unpaved roads. The aggregate should be clean, hard and durable, and should be
applied a depth sufficient to create soil stabilization in accordance with
material specifications. A minimum depth of three inches is the standard in the
absence of such specifications.
3.
"Apply and maintain water" means reducing PM emissions and wind erosion by
applying water to bare soil surfaces until the surfaces are visibly
moist.
4. "Best management
practice" means a technique verified by scientific research, that on a
case-by-case basis is practical, economically feasible, and effective in
reducing PM emissions from a regulated agricultural activity.
5. "Biological control of aquatic weeds"
means reducing at least one trip, or to one trip if only one trip is needed,
per treatment, made by vehicles for the purposes of removing aquatic weeds from
canals by using fish, and other biologic means, within the canal through the
use of to control the growth of aquatic weeds that reduce operating capacities
and create debris that causes other operational issues.
6. "Canals" means facilities constructed for
the sole purpose of the control, conveyance, and delivery of water. These
facilities may be either open earthen channels, lined or unlined, or buried
pipelines, which are used to convey water uphill and under obstructions, such
as roadways and wash and river channels. These facilities include, but are not
limited to, gate, inlet, outlet, safety, and measuring structures required to
control water along the canals and deliver water to irrigation district
customers, as well as compacted earthen banks constructed to protect these
facilities from storm runoff events.
7. "Committee" means the Governor's
Agricultural Best Management Practices Committee.
8. "Debris" means trash, rubble, and other
non-soil materials.
9. "Dredge
canals" means reducing PM emissions by mechanically removing muck, debris, and
other foreign objects from canals while material is still wet or
damp.
10. "Dust Control Forecast"
means a forecast, which shall identify a low, moderate or high risk of dust
generation for the next five consecutive days and shall be issued by noon on
each day the forecast is generated. When developing these forecasts, the
department shall consider all of the following:
a. Projected meteorological conditions,
including:
i. Wind speed and
direction,
ii.
Stagnation,
iii. Recent
precipitation, and
iv. Potential
for precipitation;
b.
Existing concentrations of air pollution at the time of the forecast;
and
c. Historic air pollution
concentrations that have been observed during meteorological conditions similar
to those that are predicted to occur in the forecast.
11. "Earth materials" means natural materials
covering the ground surface, which includes, but are not limited to, dirt,
rocks, or soil.
12. "Grading
roadways" means mechanically smoothing and compacting the roadway
surface.
13. "Irrigation District"
means a political subdivision, governed by title 48, chapter 19.
14. "Limit activity" means performing only
critical operational or emergency activity on a day forecast to be high risk
for dust generation as forecasted by the Pinal County Dust Control
Forecast.
15. "Major earth moving
activities" means the mechanical movement of earth materials to reconstruct,
relocate, reshape, reconfigure canals, including operation and maintenance
roads and utility access roads.
16.
"Maricopa PM nonattainment area" means the Phoenix planning area as defined in
40 CFR
81.303, which is incorporated by reference in
R18-2-210.
17. "Minor earth moving
activities" means the mechanical movement of earth materials to repair and
maintain the existing configuration, location, bank slopes, or inclines of
canals.
18. "Muck" means water that
is saturated with mud, dirt, and soil, which accumulates over time along the
bottom of canals.
19. "Paved Public
Road" means any paved roadways that are open to public travel and maintained by
a City, County, or the State.
20.
"Pinal County PM Nonattainment Area" means the West Pinal
PM
10 planning area and the West Central PM
2.5
planning area, as defined in
40 CFR
81.303, and incorporated by reference in
R18-2-210.
21. "PM" includes both
particulate matter with an aerodynamic diameter less than or equal to a nominal
2.5 micrometers as measured by a reference method based on 40 CFR
50 Appendix
L, or by an equivalent method designated according to 40 CFR
53 ; and
particulate matter with an aerodynamic diameter less than or equal to a nominal
10 micrometers as measured by a reference method contained within 40 CFR
50
Appendix J or by an equivalent method designated in accordance with 40 CFR
53,
as incorporated by reference in Appendix 2.
22. "Reduce vehicle speed" means reducing PM
emissions and soil erosion from the use of vehicles owned or operated by the
irrigation district on unpaved operation, maintenance, and utility access
roads, at speeds not to exceed 25 mph. This can be achieved through worker
behavior modifications, signage, or any other necessary means.
23. "Regulated agricultural activity" means
activities of an irrigation district, which affects those lands and facilities
that are under the jurisdiction and control of an irrigation district, as
described in §
49-457(P)(1)(f)
and A.R.S. §
49-457(P)(5)(b).
24. "Regulated area" means a regulated area
as defined in A.R.S. §
49-457(P)(6)(c).
25. "Sediment" means muck that has dried
after removal from canals.
26.
"Supervisory control system" means a system that allows the irrigation district
to control operational structures from a remote computer location in order to
reduce at least one trip made by vehicles to access structures for operational
purposes.
27. "Synthetic or natural
particulate suppressant" means reducing PM emissions and wind erosion by
providing a stabilized soil surface with organic material, such as muck, animal
waste or biosolids, or with a manufactured product such as lignosulfate,
calcium chloride, magnesium chloride, an emulsion of a petroleum product, an
enzyme product, or polyacrylamide.
28. "Track-out control system" means
minimizing any and all material that adheres to and agglomerates on all
vehicles and equipment and falls onto paved public roads or shoulders to paved
public roads by using a device or system to remove mud or soil from a vehicle
or equipment before the vehicle enters a paved public road. Devices such as a
grizzly, a gravel pad or a wheel wash system can be used.
29. "Unauthorized use" means any travel or
access by non-district personnel in non-district vehicles along roadways under
the control of an irrigation district without the permission of the irrigation
district.
30. "Unpaved operation
and maintenance roads" means unpaved roadways that lay adjacent to canals,
which provide access for irrigation district personnel and equipment for direct
operation and maintenance of canals, and are under the control of the
irrigation district.
31. "Unpaved
utility access roads" means unpaved roadways used to provide access to canals,
and also includes office and shop facilities, equipment yards, staging areas
and other lands under the control of the irrigation district.
32. "Weed management" means reducing at least
one trip made by vehicles for the purposes of removing weeds by using a
combination of techniques, including organic, chemical, or biological means, to
control weeds along canal banks and land surfaces not used for conveying water,
excluding unpaved roadways.
33.
"Wind barrier" means reducing PM10 emissions and wind
erosion by constructing a fence or structure, or providing a woody vegetative
barrier by planting a row of trees or shrubs, perpendicular or across the
prevailing wind direction to reduce wind speed by changing the pattern of air
flow over the land surface. For fences and structures, the wind barrier shall
have a density of no less than 50% and the height of the wind barrier must be
proportionate to the downwind protected area. The downwind protected area is
considered ten times the height of the wind barrier. For vegetative barriers,
compliance shall be determined by NRCS Conservation Practice Standard, Code
380, Wind-break/Shelterbelt Establishment, amended through August 21, 2009 (and
no future editions).
