vert the maximum flow from a 100-year storm, unless the
cluding a discussion of their characteristics, is presented
volume of the contributing flow will not cause appreciable
in EPA 600/2-79-165.
loss of freeboard.
(3) A more permanent solution .to controlling
(4) If overtopping is imminent or a failure occurs,
wind dispersal of dust is vegetating exposed inactive soil
provisions must be available to divert flow to another unit
borrow areas, land application areas, and soil stockpile
or stop the inflow.
areas. Vegetative cover not only serves as a permanent
d. Control of wind dispersal. Wind dispersal
method of suppressing dust, it also serves to enhance
control measures are required for waste piles, land
the aesthetics of the site. The particular vegetative
treatment areas, and landfills. The generation and
species selected should be compatible with soil type,
dispersion of dust from a hazardous waste unit can pose
growing conditions, climate, and site end use. Additional
potential health hazards as well as affect visibility. Dust
information concerning selection of vegetative species
emissions can occur by wind erosion of exposed soil or
and planting techniques is presented in EPA 600/2-79-
waste areas, vehicle traffic on unpaved haul roads, and
soil handling activities.
(4) Control provisions to reduce or eliminate the
(1) Although watering for immediate control can
generation of fugitive dust from unpaved haul roads
be an effective short-term wind dispersal method,
include (1) physical stabilization (placing a gravel layer
additional control methods should be implemented to
on the road), or (2) chemical stabilization (application of
minimize long-term wind erosion of open soil or waste
areas. Control methods include physical, chemical or
(5) Imposing speed reductions on unpaved
vegetative stabilization of exposed surfaces.
roads during dry weather can also help to reduce dust
(2) Physical stabilization involves covering exposed
surfaces with a material that prevents wind from
(6) For land treatment facilities, wind dispersal
disturbing the surface particles; materials used for this
control measures include (1) surface wetting (irrigation)
purpose include rock, soil (including daily and
with water or chemical agents, (2) development of a
intermediate cover), crushed or granulated clay, bark or
vegetative cover, (3) windbreaks, and (4) waste
Chemical stabilizers, often used in
application timing. The specific control measure(s)
conjunction with water, can provide dust suppression for
selected will depend on site-specific conditions.
Since many of these chemical
Additional information concerning wind dispersal control
compounds are proprietary, their characteristics are
for land treatment units is available in EPA SW-874 and
difficult to evaluate without site-specific field testing.
the EPA Office of Solid Waste Draft RCRA Guidance
Information concerning these chemical stabilizers, in-
Document for Land Treatment.