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dosage(lbs.) = volume(ft3) × dosage rate(lbs./1,000 ft3)
volume(ft3) × dosage rate(lbs.)
1,000 ft3
= ----------------------------------------------------------------------------
TABLE 2-5-2: Determine the Responsibility for Monitoring the Aeration
If the fumigation
chamber is:
And the treatment
schedule is: Then:
Privately or State
owned
A labelled treatment RELEASE the fumigation to the
fumigator to aerate and release the
commodity
A FIFRA Section 18
Exemption (noted in the
treatment schedules)
1. MONITOR the aeration, and
2. USE the following table to
determine which aeration
PPQ owned procedures to follow
TABLE 2-5-3: Determine the Aeration Procedure
If the chamber is: And the cargo is: Then:
NAP Noncontainerized Use the procedures on page-2-5-5
Containerized Use the procedures on page-2-5-6
Vacuum Use the procedures on page-2-5-6
Chemical Treatments Fumigants • Methyl Bromide • Chamber Fumigation
Normal Atmospheric Pressure Chamber—Aerating Noncontainerized Cargo
10/2002-04 Treatment Manual 2-5-5
PPQ
Each chamber must be equipped with at least one permanent, metal
gas sampling tube to allow you to take colorimetric tube readings
during the aeration. Any extensions of the gas sampling tube or
flexible connectors must be made of Teflon™ tubing or metal. The gas
sampling tube must be located in the vicinity of the exhaust duct
inside the chamber. The gas sampling tube must extend outside the
chamber to allow for colorimetric tube readings.
Normal Atmospheric Pressure Chamber—Aerating Noncontainerized Cargo
Step 1—Securing the Area
Assuming that you’ve already secured the fumigation area, allow only
the chamber operator and the PPQ officer monitoring the fumigation
into the secure area.
Step 2—Aerating the Chamber
Run the exhaust long enough to obtain at least four complete changes
of air (about 4 to 15 minutes per change of air or 1 hour).
Step 3—Taking Concentration Readings
Draw an air sample from the chamber into a colorimetric tube. Air
samples must be taken near the floor of the chamber in the vicinity of
the exhaust duct. This can be accomplished by installing a metal tube
in the chamber to transport the sample from the floor to a convenient
opening in the chamber walls.
Use Table 2-5-4 to determine when to release the commodity.
WARNING
Do not allow motorized vehicles to operate within the secure area.
TABLE 2-5-4: Deterimine When to Release the Commodity
If the gas concentration is: Then:
5 ppm or less RELEASE commodity
6 ppm or above 1. TAKE concentration readings, and
2. RELEASE commodity when the concentration level is 5
ppm or less
Chemical Treatments Fumigants • Methyl Bromide • Chamber Fumigation
Normal Atmospheric Pressure Chamber—Aerating Containerized Cargo
2-5-6 Treatment Manual 10/2002-04
PPQ
Normal Atmospheric Pressure Chamber—Aerating
Containerized Cargo
Step 1—Securing the Area
Assuming that you’ve already secured the fumigation area, allow only
the chamber operator and the PPQ officer monitoring the fumigation
into the secure area.
Step 2—Aerating the Chamber
Run the exhaust long enough to obtain at least four complete changes
of air (about 4 to 15 minutes per change of air or 1 hour). If the
containers have internal fans, run them unless they are operated by
internal combustion engines. Remove container from the chamber at
the conclusion of four complete changes of air to an outdoor secure
area for passive aeration. Wear the SCBA while the container is being
moved outdoors.
Step 3—Taking Concentration Readings
Wearing your SCBA, draw an air sample 3 feet inside the container
and 3 feet above the floor.
Use the following table to determine when to release the commodity.
Vacuum Fumigation Chambers—Aerating Containerized and Noncontainerized
Cargo
Step 1—Securing the Area
Assuming that you’ve already secured the fumigation area, allow only
the chamber operator and the PPQ officer monitoring the fumigation
into the secure area.
WARNING
Do not allow motorized vehicles to operate within the secure area.
TABLE 2-5-5: Determine When to Release the Commodity
If the gas concentration is: Then:
5 ppm or less RELEASE commodity
6 ppm or above 1. CONTINUE passive aeration
2. TAKE concentration readings, and
3. RELEASE commodity when the concentration level is 5
ppm or less
Chemical Treatments Fumigants • Methyl Bromide • Chamber Fumigation
　
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