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fumigations.
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Aerating Sorptive, Noncontainerized Cargo—Indoors and Outdoors
03/2004-05 Treatment Manual 2-4-37
PPQ
Step 2—Aerating the Commodity
Outdoor
Fumigations
Advise the fumigator to:
1. Lift both ends of the tarpaulin.
2. Start the circulation fans and exhaust fans (if available).
3. Run the fans for 4 hours.
4. Remove the tarpaulin.
5. Take concentration readings with colormetric tubes 4 feet from
the base of the stack and 1 foot inside the stack at two locations
between the cartons, but not inside the cartons.
After the fumigator takes the concentration reading, you must record
the date, concentration reading, and time in Block 39 of PPQ Form
429. Then use the following table to determine when to release the
commodity.
Indoor
Fumigations
Advise the fumigator to:
1. Complete the installation of the exhaust duct.
2. Start the circulation fans and exhaust fans.
3. Lift the end of the tarpaulin opposite the exhaust fan.
4. Run the fans for 4 hours.
5. Stop the fans and take concentration readings with colorimetric
tubes in the exhaust duct within 2 feet of the enclosure.
6. Remove the tarpaulin.
After the fumigator takes the concentration reading, you must then
record the date, concentration reading, and time in Block 39 of PPQ
Form 429. Then use the following table to determine when to release
the commodity. Take successive readings at intervals of not less than
2 hours. Take concentration readings with colormetric tubes 4 feet
TABLE 2-4-15: Determine when to Realease the Commodity
If the gas concentration level is: Then:
5 ppm or less RELEASE the commodity
6 ppm or more 1. CONTINUE aeration and take concentration readings
until the level is 5ppm or less, then
2. RELEASE the commodity
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Aerating Sorptive Commodities in Containers—Indoors and Outdoors
2-4-38 Treatment Manual 03/2004-05
PPQ
from the base of the stack and 1 foot inside the stack at two locations
between the cartons, but not inside the cartons. You, as well as the
fumigator, may take concentration readings.
Aerating Sorptive Commodities in Containers—Indoors and Outdoors
Step 1—Installing the 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
or the container.
2. Install an air introduction duct system consisting of a 3,750 cfm
or greater fan attached to a 12 inch or greater 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 fumigations, 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 30 feet beyond the container.
Step 2—Aerating the Commodity
Indoors Advise the fumigator to:
TABLE 2-4-16: Determine When to Release the Commodity for Indoor Fumigations
If the gas
concentration level is: Then:
5 ppm or less 1. REMOVE the tarpaulin, and
2. RELEASE the commodity
6 ppm to 99 ppm 1. REMOVE the tarpaulin, and
2. CONTINUE aeration until the concentration is 5 ppm or less1,
then
3. RELEASE the commodity
1 Take concentration readings with colormetric tubes 4 feet from the base of the stack and 1 foot
inside the stack at two locations between the cartons, but not inside the cartons.
100 ppm or above 1. CONTINUE aeration and take concentration readings until the
concentration level is below 100 ppm, then remove the
tarpaulin, and
2. CONTINUE aeration until concentration is 5 ppm or less, then
3. RELEASE the commodity
Important
This step is not required for outdoor fumigations.
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Aerating Sorptive Commodities in Containers—Indoors and Outdoors
03/2004-05 Treatment Manual 2-4-39
PPQ
1. Complete installation of exhaust duct and begin exhaust fan
operation.
2. Lift both ends of the tarpaulin and begin exhaust fan operation.
Do not remove the tarpaulin until the gas concentration level is
below 100 ppm (see Table 2-4-17).
3. Start the circulation and air introduction fans. Sorptive
commodities generally require 12 hours or longer to aerate. Since
sorptive commodities vary in their rates of desorption, aeration
may be completed in less than 12 hours. Require a minimum of 4
　
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