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In warehouses, an exhaust system must be provided to exhaust MB to
the outside of the building. Ensure that the exhausted gas does not
reenter the building nor endanger people working outdoors.
When treatments are conducted in a paticular location on a regular
basis, a permanent site should be designated. At such sites, the fan
used to remove the fumigant from the enclosure during aeration must
be connected to a permanent stack extending above the roof level.
If fumigations are conducted outside, select a site that is
semi-sheltered such as the leeward side of a warehouse, pier, or
building that offers some protection from strong winds.
Ability to Heat
Area
When cooler temperatures (below 40 °F) are expected, the site must be
heated to maintain commodity temperatures above 40 °F. Take the
ambient temperature 12 inches above the floor.
An Impervious
Surface
Select an asphalt, concrete, or tight wooden surface—not soil, gravel,
or other porous material. If you must fumigate on a porous surface,
cover the surface with asphalt (tar) paper or plastic tarpaulins. For
large fumigations, covering the surface is not usually practical
because pallets must be rearranged and heavy equipment used to
move the commodity. On docks, wharfs, and piers, check for cracks,
holes, and manhole covers which will allow the MB to escape through
the floor. Have all cracks, holes, and manhole covers sealed with
plastic or asphalt paper.
Do not use flame or exposed electrical element heaters under the tarpaulin
during treatment because MB may cause the formation of hydrogen bromide.
Hydrogen bromide (hydrobromic acid) is a highly corrosive chemical which can
cause damage to the heater and to surrounding materials including the
commodity. Hot air or radiator type heaters can be used for heating under
tarpaulins. When using space heaters to heat warehouses, there must be
adequate ventilation.
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Preparing to Fumigate
2-4-6 Treatment Manual 03/2004-05
PPQ
A Nonwork Area Select a secure area where traffic and people are restricted from
entering and which is isolated from people working. You want a
nonwork area to help prevent accidents such as a forklift piercing a
tarpaulin and for other safety reasons. Consider either the entire
structure area or an area which extends 30 feet from the tarpaulin
and is separated by a physical barrier such as ropes, barricades, or
walls as the fumigation area. If a wall of gas-impervious material is
less than 30 feet from the tarpaulin, the wall may serve as the edge of
the secured area. Some states, for example California, require a 100
foot buffer zone. Place placards clearly in sight of all who come near.
Placards must meet label requirements regarding specific warnings,
information, and language. Placards generally include the name of the
fumigant, the fumigation date, time, and the name of the company
conducting the fumigation. Restrict access to the fumigation area to
the fumigator’s employees and PPQ employees monitoring the
treatment. Use rope or marker tape to limit access within 30 feet of the
enclosure. Do not allow motor vehicles (includes forklifts) to operate
within 30 feet of the enclosure during the fumigation and aeration
periods. The area outside the 30-foot perimeter is usually regarded as
a safe distance from the tarpaulin. Gas concentrations exceeding 5.0
ppm (TLV for MB) are seldom recorded by gas monitoring, except
during aeration. PPQ Officers that work within the 30-foot primeter must
wear (and use) respiratory protection (SCBA), unless the gas levels are safe to
breath and validated as safe by gas monitioring. The 30-foot perimeter is not
specifically mentioned on the MB label, but is required for PPQ Officers.
When space is tight, it is permissible to overlap two adjoining 30-foot
perimeters. However, there must be sufficient space for a person
wearing SCBA to walk between the tarpaulins.
Electrical Power
Supply
An adequate electrical source must be available to run the circulation
fans and the T/C unit. A separate line should be available for the T/C
unit. Electrical outlets must be ground and conveniently located in
relation to the fumigation area. Do not use generators as a power
source, except under emergency conditions.
Water Supply A water supply is necessary for safety purposes. Water is necessary for
washing off MB if the liquid form is spilled on someone. Water is also
used to fill the volatilizer. If no permanent water is present on site, the
fumigator must provide a portable, 5-gallon supply of clean water.
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