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schedules for specifics.
Then extend exposure:
Less than 12 hours 10 oz. or less 10 percent of the time lapse since the last
acceptable reading
11 oz. or more 30 minutes
12 hours or more 10 oz. or less 10 percent of the time lapse since the last
acceptable reading
11 oz. or more 2 hours or 10 percent of time lapse since last
acceptable reading, whichever is greater
Fresh fruits and vegetables are sensitive to MB so you should double check
volume calculations and dosage measurements to avoid accidental
overdoses. If any 30 minute readings are 50 percent or more above the
minimum concentration, it indicates a miscalculation of the dosage. Include a
brief report on the PPQ Form 429 stating possible reasons for the overdose.
Exposure periods are decreased for fumigations where concentration readings
are much higher than required. See table on the following pages to determine
when to reduce exposure periods.
Important
These tables apply only to those T101 schedules lasting 2 hours or less at a
dosage rate of 4lbs/1000ft3 or less. They do not apply to schedules of longer
duration.
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Conducting the Fumigation
2-4-26 Treatment Manual 03/2004-05
PPQ
Adding Gas
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 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 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.
To avoid injuring the commodity, add fumigant using the following formula:
1.6 × number of oz. below minimum × volume in ft.3/1,000 ft.3 = oz. of
gas to add or oz. of gas to add/16 oz/lbs. = pounds (lbs.) of gas to add.
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Conducting the Fumigation
03/2004-05 Treatment Manual 2-4-27
PPQ
TABLE 2-4-5: Determine Gas Concentration Values and Corrections for Fruits and
Vegetables at the 30 Minute Reading of T101-a-1 or Equivalent
Schedules.
If the
schedule
is:
Add the minimum
concentration
reading (oz.) in
schedule is:
And the average
concentration
reading (oz.) is: Then:
40-49 °F
4 lbs for 2
hrs
48 73 or higher* EVACUATE excess gas immediatley
65 or greater1
1 *If concentration reading is more than 50 percent above the minimum concentration
reading, it indicates that something is radically wrong and an immediate check should
be made to determine the cause and to correct it.
REDUCE exposure by 15 minutes
64-48 TAKE 2 hour reading as scheduled
47 or lower 1. ADD gas, and
2. EXTEND exposure 15 minutes
50-59 °F
3 lbs for 2
hrs
38 58 or higher* EVACUATE excess gas immediatley
52 or greater REDUCE exposure by 15 minutes
51-38 TAKE 2 hour reading as scheduled
37 or lower 1. ADD gas, and
2. EXTEND exposure 15 minutes
60-69 °F
2.5 lbs for
2 hrs
32 49 or higher* EVACUATE excess gas immediatley
48 or greater REDUCE exposure by 15 minutes
47-32 TAKE 2 hour reading as scheduled
31 or lower 1. ADD gas, and
2. EXTEND exposure 15 minutes
70-79 °F
2 lbs for 2
hrs
26 40 or higher* EVACUATE excess gas immediatley
37 or greate REDUCE exposure by 15 minutes
36-26 TAKE 2 hour reading as scheduled
25 or lower 1. ADD gas, and
2. EXTEND exposure 15 minutes
80-89 °F
1.5 lbs for
2 hrs
19 30 or higher* EVACUATE excess gas immediatley
27 or greater REDUCE exposure by 15 minutes
26-19 TAKE 2 hour reading as scheduled
18 or lower 1. ADD gas, and
2. EXTEND exposure 15 minutes
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Conducting the Fumigation
2-4-28 Treatment Manual 03/2004-05
PPQ
Special Procedures for Adding Gas to Oak Logs and Lumber
Using T312 or Equivalent
After taking the 24 hour concentration reading, if necessary, add gas
　
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