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export. At the 24 hour reading, the T/C unit readings indicate a 160
oz. concentration level. To determine how much gas to add, do the
following:
240 oz. − 160 oz. = 80 oz. below 240 oz.
1.6 × 80 oz. × 10,000 ft3/1,000 ft3 = 1,280 oz. or
Take concentration readings 30 minutes after adding gas and record
on the PPQ Form 429.
Exhausting the Gas
Exhaust the gas at the completion of the exposure period. If the
treatment schedule is a FIFRA Section 18 Exemption, then you must
monitor the aeration of the commodity. Use the following table to
determine the need to monitor the aeration of the fumigation.
Aerating the Enclosure
Aeration procedures are designed to provide safe working conditions
during the aeration period and to assure that commodities are safe for
handling, storage, and transportation. A fumigant must be aerated in
accordance with Environmental Protection Agency (EPA) label
requirements, the Occupational Safety and Health Administration
(OSHA), and the PPQ Treatment Manual.
TABLE 2-8-7Determine the Need to Monitor Aeration
If the treatment schedule is: Then:
A FIFRA Section 18 Exemption MONITOR the aeration of the commodity. FOLLOW “Aerating the
Enclosure” steps which follow.
A labelled treatment RELEASE the commodity and RELEASE the fumigation to the
fumigator for aeration.
oz. of gas to add
16 oz.
lbs.
--------
--------------------------------------- = pounds (lbs.) of gas to add
1,280oz.
16 oz.
lbs.
--------
-------------------- = 80 pounds (lbs.) of gas to add
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
Aerating the Enclosure
2-8-24 Treatment Manual 10/2002-04
PPQ
Aeration of fumigated structures and ships are covered within those
particular sections.
Responsibility for Aerating the Commodity
The label requires that at least two people trained in the use of the
fumigant must be present at all times during gas introduction,
treatment, and aeration. The PPQ officer, however, is not required to
be continuously present at the fumigation site throughout the aeration
process unless specified by the label or by State or local regulations.
If the fumigation is performed under a Section 18 Exemption, then a
PPQ officer must be present at the initiation of aeration and to verify
the final aeration readings.
Materials Needed
The following materials will be needed to aerate the enclosure:
◆ SCBA6
◆ Colorimetric tubes* (Draeger or Kitagawa for example)
◆ Exhaust fan7
◆ Exhaust duct**
◆ Danger signs**
◆ Materials for limiting access to area (barricades, rope)**
◆ PPQ Form 429
The following procedures apply to the aeration of all container
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 2-8-8: 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 on page-2-4-31 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.
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
Aerating the Enclosure
10/2002-04 Treatment Manual 2-8-25
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 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
　
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