Best Practices for the Reduction of Air Emissions From Construction ...

CHEMINFO
Freeboard - the vertical distance between the top
edge of a cargo container area and the highest point
at which the bulk material contacts the sides, front
and back of the container.
Fugitive Dust – any particulate matter becoming
airborne, other than being emitted from an exhaust
stack, directly or indirectly as a result of human
activity.
Gravel Pad - a layer of washed gravel, rock or
crushed rock which is at least one inch or larger in
diameter, maintained at the point of intersection of a
paved public roadway and a work site or source
entrance to dislodge mud, dirt and/or debris from the
tire of the motor vehicles or haul trucks prior to
leaving the work site.
Grizzly - a device maintained at the point of
intersection of a paved public roadway and a work
site or source entrance to dislodge mud, dirt and/or
debris from the tires of the motor vehicles or haul
trucks prior to leaving the work site.
Haul Truck - any fully or partially open-bodied self
propelled vehicle including any non-motorized
attachments, such as but not limited to trailers or
other conveyances which are connected to or
propelled by the actual motorized portion of the
vehicle used for transporting bulk material.
High Wind Conditions – when instantaneous wind
speeds exceed 25 mph (40 kph).
Inactive Disturbed Surface Area – any disturbed
surface area upon which active operations have not
occurred or are not expected to occur for a period of
10 consecutive days.
Microgram (μg) – a metric unit of mass equal to
one-millionth of a gram.
Micron - a metric unit of length equal to one
millionth of a meter or 1/100th the width of a human
hair.
Off-road Vehicle - any self-propelled conveyance
specifically designed for off-road use, including not
limited to, bulldozers, loaders, excavators, graders,
off-road trucks, forklifts, all-terrain vehicles, utility
vehicles, snow blowers and portable generator sets. A
complete list of off-road vehicles and equipment can
be found at the following website:
www.ec.gc.ca/transport/offroad2004/offRoad_full_listing_e.htm
Opacity - the degree to which emissions reduce the
transmission of light and obscure the view of an
object in the background.
Open Storage Pile – any accumulation of bulk
material with 5% or greater silt content not fully
enclosed, covered or chemically stabilized, and
attaining a height of three feet or more and a total
surface area of 500 or more square feet.
Particulate Matter (PM) – the term for particles
found in the air, including dust, dirt, soot, smoke,
and liquid droplets. Some particles are large or dark
enough to be seen as dust or smoke. Others are so
small that individually they can only be detected with
an electron microscope.
PM10, - particulate matter that is less than 10
microns in diameter.
PM2.5 - particulate matter that is less than 2.5
microns in diameter.
Power Take-off Equipment - an accessory that is
mounted onto a transmission, allowing power to be
transferred outside the transmission to a shaft or a
driveline. Some examples of vehicles with power
take-off equipment are cement mixers, trucks with
hydraulic winches, car carriers, mobile cranes and
sewer cleaning trucks.
Porosity –the fabric or materials of the fence/barrier
will be greater than 50% of the entire surface area.
The holes in the fence/barrier will be less than 50%
of the entire surface area.
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