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fumigations.
Securing the Area
Assuming that you have already restricted access and secured the
fumigation area, you now must restrict access to the area where the
exhaust duct extends on the ground beyond the enclosure.
TABLE 2-4-8: Determine Responsibility for Aerating the Commodity
If the Treatment
Schedule is: Then:
A FIFRA Section 18
Exemption
1. MONITOR the aeration of the enclosure, and
2. USE the table 2-4-9 to determine which aeration procedure to follow
A labeled
Treatment
Schedule
1. RELEASE the fumigation to the fumigator to aerate according to
label instructions and the conditions of the compliance agreement.
2. RELEASE the commodity.
6 Materials required for both PPQ and commercial fumigator.
7 Materials to be furnished by the commercial fumigator.
8 Materials to be furnished by the commercial fumigator.
9 Materials to be furnished by the commercial fumigator.
10 Materials to be furnished by the commercial fumigator.
During the first 10 minutes of aeration, it is recommended that no people
should be within 200 feet of the exhaust duct outlet.
If this buffer zone is regulated by the State or municipality where the
fumigation takes place, local regulations must be followed.
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Wearing Respiratory Protection
03/2004-05 Treatment Manual 2-4-31
PPQ
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.
Advise the fumigator to use a physical barrier such as ropes,
barricades, or walls to secure the area.
Placard the secure area near the exhaust outlet with the appropriate
DANGER/PELIGRO signs. Make sure the placards meet the
appropriate fumigant label or labeling requirements. The skull and
crossbones should be present as well as “AREA UNDER FUMIGATION,
DO NOT ENTER/NO ENTRE”; date of the fumigation; name of the
fumigant used; and the name, address, and telephone number of the
fumigator.
Unless you authorize their use, do not allow motorized vehicles to
operate within the secure area.
Wearing Respiratory Protection
The fumigator and the PPQ officer monitoring the aeration must wear
approved respiratory protection (SCBA, air supplied respirator, or a
combination unit) when:
◆ Installing the exhaust system
◆ Opening the tarpaulin for aeration
◆ Removing the tarpaulin if measured levels of fumigant are above
5 ppm
◆ Any time during the aeration process when a risk of exposure to
concentrations above 5 ppm exists. This includes any time the
concentration is unknown.
TABLE 2-4-9: Determine the Aeration Procedure
If: And: And: Then:
Nonsorptive Containerized GO to page-2-4-32
Noncontainerized Fresh fruits and
vegetables, and cut
flowers
GO to page-2-4-33
Other than fresh fruits
and vegetables, and
cut flowers
GO to page-2-4-33
Sorptive, including
yams and chestnuts
Containerized GO to page-2-4-38
Noncontainerized GO to page-2-4-36
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Aerating Nonsorptive, Containerized Cargo—Indoors and Outdoors
2-4-32 Treatment Manual 03/2004-05
PPQ
Aerating Nonsorptive, Containerized Cargo—Indoors and Outdoors
Step 1—Installing Exhaust System
Advise the fumigator to:
1. Install an exhaust fan (minimum of 5,200 cfm capacity) to a 16
inch, or greater, diameter duct located at the floor near rear
doors of the container.
2. Install an air introduction duct system consisting of a 3,750 cfm,
or greater, fan attached to a 12 inch, or larger, duct which
reaches two-thirds of the length of the container at the top of the
load. Have the ducts installed prior to the start of the fumigation.
For indoor fumigation, extend the exhaust duct at least 30 feet
beyond the building or through a vertical stack extending
through the roof. For outdoor fumigations, extend the exhaust
duct at least 30 feet beyond the container.
Step 2—Aerating the Commodity
Advise the fumigator to:
1. Connect the exhaust duct to the exhaust fan.
2. Start the exhaust fan(s) and lift the end of the tarpaulin opposite
the end at which the exhaust fan and duct are located.
3. Aerate for 3 hours.
4. Stop the aeration fans.
5. Use a colorimetric tube to take a concentration reading in the
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