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Special Procedures for Adding Gas and Extending Exposure Period
2-8-20 Treatment Manual 10/2002-04
PPQ
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 2-8-21
PPQ
TABLE 2-8-5: 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:
And the
minimum
concentratio
n reading
(oz.) in the
schedule is:
And the average
concentration reading
(oz.) is: Then:
40-49 °F
4 lbs for 2
hrs
48 73 or higher1 EVACUATE excess gas
immediately
65 or greater* 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
immediately
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
immediately
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
immediately
37 or greater 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
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
Special Procedures for Adding Gas and Extending Exposure Period
2-8-22 Treatment Manual 10/2002-04
PPQ
80-89 °F
1.5 lbs for 2
hrs
19 30 or higher* EVACUATE excess gas
immediately
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
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.
TABLE 2-8-6: Determine Gas Concentration Values and Corrections for Fruits and
Vegetables at the 2 Hour Reading of T101-a-1 or Equivalent
Schedules
If the schedule is:
And the average
concentration reading at
2 hours is: Then do not add gas, but:
40-49 °F 4 lbs for 2 hours 38 and above AERATE commodity (see page-2-4-29)
37-28 EXTEND exposure by 15 minutes
27-25 EXTEND exposure by 30 minutes
50-59 °F 3 lbs for 2 hrs 29 and above AERATE commodity (see page-2-4-29)
28-24 EXTEND exposure by 15 minutes
23-21 EXTEND exposure by 30 minutes
60-69 °F 2.5 lbs for 2 hrs 24 and above AERATE commodity (see page-2-4-29)
23-21 EXTEND exposure by 15 minutes
20-18 EXTEND exposure by 30 minutes
70-79 °F 2 lbs for 2 hrs 19 and above AERATE commodity (see page-2-4-29)
18-16 EXTEND exposure by 15 minutes
15-13 EXTEND exposure by 30 minutes
80-89 °F 1.5 lbs for 2 hrs 14 and above AERATE commodity (see page-2-4-29)
13-12 EXTEND exposure by 15 minutes
11-10 EXTEND exposure by 30 minutes
TABLE 2-8-5: Determine Gas Concentration Values and Corrections for Fruits and
Vegetables at the 30 Minute Reading of T101-a-1 or Equivalent
Schedules (continued)
If the
schedule is:
And the
minimum
concentratio
n reading
(oz.) in the
schedule is:
And the average
concentration reading
(oz.) is: Then:
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
Aerating the Enclosure
10/2002-04 Treatment Manual 2-8-23
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
to bring the concentration level up to 240 ounces. Subtract the 24
hour concentration reading from 240 to determine how many ounces
the concentration is below 240 ounces. Use the following formula in
calculating how much gas to add:
1.6 × number of oz. below 240 × volume in ft3/1,000 ft3 = oz. of gas to
add or
EXAMPLE: You’re fumigating a 10,000 ft3 enclosure of oak logs for
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