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monitor the fumigation closely until the concentration level stabilizes.
Four, Six, Twelve, or Thirty-Six Hour Reading
Not required if previous readings are satisfactory and experience with
similar fumigations indicate successful treatment can be expected. If
either the 4, 6, 12, or 36 hour reading is the final reading, then you
must take the reading. If you are unfamilar with the treatment
schedule, optional concentration readings may be necessary to ensure
a successful fumigation.
Final Reading
The final reading is required for all container fumigations in order to
determine if the fumigation has been successfully completed. You may
start the final reading before the finishing time of the treatment so
that aeration commences at the finishing time. Starting the final
reading before finishing time is especially critical when fumigating
perishables. Do not add gas after the final reading.
Additional Readings
Decide the need to take additional readings based on the following:
◆ Rate of gas concentration decrease
◆ Any condition which could change the gas concentration such as
severe winds, or rain.
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
Conducting the Fumigation
2-8-16 Treatment Manual 10/2002-04
PPQ
When concentration readings differ by more than 4 ounces, run the
fans to equalize the gas and record readings on the APHIS 429.
Generally, at the ½ hour reading, gas should be evenly distributed,
and you should not have to restart the fans unless you added gas.
Severe winds (30 mph or higher including any amount severe enough
to cause damage) are a good reason to take additional readings on an
outdoor fumigation. Any sharp or unusual decreases of the readings
in relation to previous readings is a clue to take corrective action and
supplementary readings. Take additional readings every 30 minutes
until problems are rectified. Adverse weather conditions may indicate
the need for additional readings.
Sorptive commodities may also require additional concentration
readings.
Step 4—Determining the Need to Add Gas and Adjust Exposure
Use the following table to determine when to add gas or extend the
exposure period:
TABLE 2-8-3Determine the Need to Add Gas and Adjust Exposure
If the average T/C unit
readings are:
And the
schedule is: Then:
Below the required
minimum concentration
T101-a--1* or
equivalent
ADD gas and extend fumigation. SEE “Special
Procedures for Fruits and Vegetables” on
page-2-4-25
Other than T101a--1 or
equivalent
ADD gas using “Special Procedures for
Adding Gas and Extending Exposure” on page
page-2-4-25
At or above required
minimum concentration
T101-a--1* or
equivalent
SEE page-2-4-19 for corrections at 0.5 hour
and 2 hour readings
Other than T101-a-1 No action necessary
Important
* T101-a-1 or equivalent treatment schedules are those schedules that are
not greater than 2 hours long (exposure time), and the dosage rate is not
greater than 4lbs per 1000ft3 anywhere on the schedule
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
Special Procedures for Adding Gas and Extending Exposure Period
10/2002-04 Treatment Manual 2-8-17
PPQ
Special Procedures for Adding Gas and Extending Exposure Period
Adding Gas to Commodities that are Fumigated Using Treatment
Schedules Other Than T101-a-1 or Equivalent (may include
perishables)
When adding gas, these procedures must be followed:
1. Heat water in volatilizer.
2. Turn on fans.
3. Take weight of the cylinder.
4. With your SCBA on, open valve on cylinder and introduce the
gas.
5. Close valve when the weight of the cylinder indicates that the
needed amount of gas has been added.
6. Record quantity of fumigant added in Block 34 and the
additional fan time in Block 30 of the PPQ Form 429.
Note the time the fumigator started introducing additional gas and the
time the fumigator finished introducing gas and record in Block 40
(Remarks) of the PPQ Form 429. Run the fans until there is even gas
distribution throughout the stack. Turn off fans, then take a
concentration reading 30 minutes after the gas has been introduced. If
all readings are above minimum concentration levels, then proceed as
usual with the remaining scheduled concentration readings.
Excessive leakage (concentration readings are less than 50 percent of
minimum) in any one container which cannot be eliminated in a
　
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