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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 generally regarded as a safe
distance from the container. 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.
Important
Only open-air fumigations are allowed for non-tarped containers. Non-tarped
containerized fumigations may not be conducted in a warehouse.
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
Preparing to Fumigate
2-8-6 Treatment Manual 10/2002-04
PPQ
When space is tight, it is permissible to overlap two or more adjoining
30-foot perimeters. However, there must be sufficient space for a
person wearing SCBA to walk between the containers.
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.
Well-Lighted Areas
The area should have adequate lighting for safety purposes and for
ease in reading T/C units, thermometers, and for determining whether
a container has holes or places where the MB may leak.
Aeration Requirements
Assuming that you’ve already restricted access and secured the
fumigation area, you now must restrict access to the area where the
exhaust duct extends beyond the enclosure. Before you start a
fumigation, make sure the exhaust duct is located in a safe place.
During the first 10 minutes of aeration, there should be no people
within 200 feet down wind of the exhaust duct outlet. If it is
impossible to restrict people from the area of aeration during regular
work hours, consider aeration during another time of the day. When
securing the duct outlet area, consider the direction of the wind. Face
the duct outlet toward an open area, and away from people. Point the
duct outlet upward to aid in dispersing the exhausted gas.
If an exhaust duct is not used, then a perimeter of 30 feet or more
from the containers is usually regarded as a safe distance for
personnel. However, for personal safety, gas levels should occasionally
be monitored at greater distances, especially downwind. Experience
provides the best guide.
Step 5—Arranging the Stack
Containerized Cargo
Containers should ordinarily not be loaded beyond 80 percent of their
capacity. A space of 20 percent (18 inches) should be provided above
the commodity. This allows a crawl space for placing the gas
monitoring leads and fans, and to facilitate uniform gas distribution.
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
Preparing to Fumigate
10/2002-04 Treatment Manual 2-8-7
PPQ
(Some restacking of cargo may be necessary to meet this requirement.)
The commodity should be on a pallet to allow adequate space (at least
2 inches) below the commodity.
"Due to safety considerations, APHIS recommends that containers to
be fumigated should not be stacked
Gas Penetration and Distribution
MB will penetrate most cargo easily; however, cargo may be packaged
in an impermeable material.
Some of the more common types of impermeable materials are
cellophane, plastic, wax coated materials, laminated, and
waterproofed papers. Tight wooden packing cases are also relatively
gastight. Impermeable materials will allow some gas to penetrate, but
make it difficult to aerate and evacuate the gas. Remove, perforate, or
open all impermeable materials.
　
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