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Step 5—Exhausting the Gas
Exhaust the gas at the completion of the exposure period. The
aeration of the structure and the final release to the owner is the
responsibility of the commercial fumigator unless under a Section 18
Exemption. Exhausting the fumigant is facilitated by partially
removing the tarpaulin and the use of suction fans which are supplied
with ducts leading from the enclosure to the outside. The fumigant
should be evacuated to the outside, downwind areas of the enclosure.
The fumigator must be certain that the removal of the covers and
ventilation is done in a manner that minimizes the hazard from the
released gas.
Aerating the Enclosure
TABLE 2-7-2: Determine the Responsibility for Monitoring the 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.
Chemical Treatments Fumigants • Methyl Bromide • Structure Fumigation
Aerating the Enclosure
2-7-16 Treatment Manual 10/2002-04
PPQ
Step 1—Securing the Area
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. During the first 10
minutes of aeration, there should be no people within 200 feet of the
exhaust duct outlet. 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 exhaust gas.
Have 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
fumigator.
Unless you authorize their use, do not allow motorized vehicles to
operate within the secure area.
Step 2—Aerating the Structure
Wearing the SCBA, have the fumigator open slightly the opposite end
of the enclosure to allow entry of fresh air. The fumigator may open
doors, tarpaulins, and areas to facilitate aeration. Start the exhaust
system (minimum 2,500 cfm exhaust fan connected to an exhaust
duct) and aerate the structure.
Step 3—Taking Concentration Readings
Stop the aeration fans. Take a concentration reading with a
colorimetric tube in the exhaust duct within 2 feet of the enclosure. If
the concentration is above 5 ppm but less than 100 ppm (for MB), the
fumigator may remove the tarpaulin while wearing the SCBA. Release
the structure when the concentration is 5 ppm or less after taking
readings 4 feet from the floor and 1 foot inside the fumigation
perimeter at several representative locations (a minimum of two are
required). Record the date, concentration reading, and time on PPQ
Form 429.
Important
The PPQ officer is not required to be continuously onsite during the entire
aeration unless specified by the label, Section 18 Exemption, or State or local
regulations. The officer must verify the gas concentration levels before
removal of the tarpaulin and final release of the structure.
Chemical Treatments Fumigants • Methyl Bromide • Structure Fumigation
Aerating the Enclosure
10/2002-04 Treatment Manual 2-7-17
PPQ
Chemical Treatments Fumigants • Methyl Bromide • Structure Fumigation
Aerating the Enclosure
2-7-18 Treatment Manual 10/2002-04
PPQ
10/2002-04 Treatment Manual 2-8-1
PPQ
Treatment Manual
2 Chemical Treatments 8
Fumigants • Methyl Bromide • Special
Procedures for Container Fumigations
Without a Tarpaulin
Contents
Methods and Procedures page-2-8-2
Materials Needed page-2-8-2
PPQ Officer Provides page-2-8-2
Fumigator Provides page-2-8-3
Preparing to Fumigate page-2-8-3
Step 1—Selecting a Treatment Schedule page-2-8-3
Step 2—Issuing a PPQ Form 523 (Emergency Action Notification) page-2-8-4
Step 3—Determining Section 18 Exemptions and Sampling Requirements
page-2-8-4
Step 4—Selecting a Fumigation Site page-2-8-4
Step 5—Arranging the Stack page-2-8-6
Step 6—Arranging and Operating Fans page-2-8-7
　
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