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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
export. At the 24 hour reading, the T/C unit readings indicate a 160
oz. concentration level. To determine how much gas to add, do the
following:
240 oz. − 160 oz. = 80 oz. below 240 oz.
1.6 × 80 oz. × 10,000 ft3/1,000 ft3 = 1,280 oz. or
TABLE 2-4-6: 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-2-4-32)
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-2-4-32
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-2-4-32
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-2-4-32)
13-12 EXTEND exposure by 15 minutes
11-10 EXTEND exposure by 30 minutes
oz. of gas to add
16 oz.
lbs.
--------
--------------------------------------- = pounds (lbs.) of gas to add
1,280oz.
16 oz.
lbs.
--------
-------------------- = 80 pounds (lbs.) of gas to add
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Aerating the Enclosure
03/2004-05 Treatment Manual 2-4-29
PPQ
Take concentration readings 30 minutes after adding gas and record
on the PPQ Form 429.
Step 5—Exhausting the Gas
Exhaust the gas at the completion of the exposure period. If the
treatment schedule is a FIFRA Section 18 Exemption, then you must
monitor the aeration of the commodity. Use the following table to
determine the need to monitor the aeration of the fumigation.
Aerating the Enclosure
Aeration procedures are designed to provide safe working conditions
during the aeration period and to assure that commodities are safe for
handling, storage, and transportation. A fumigant must be aerated in
accordance with Environmental Protection Agency (EPA) label
requirements, the Occupational Safety and Health Administration
(OSHA), and the PPQ Treatment Manual.
When treatments are conducted in a paticular location on a regular
basis, a permanent site should be designated. At such sites, the fan
used to remove the fumigant from the enclosure during aeration must
be connected to a permanent stack extending above the roof level.
Aeration of fumigated structures and ships are covered within those
particular sections.
Responsibility for Aerating the Commodity
The label requires that at least two people trained in the use of the
fumigant must be present at all times during gas introduction,
treatment, and aeration. The PPQ officer, however, is not required to
be continuously present at the fumigation site throughout the aeration
process unless specified by the label or by State or local regulations.
TABLE 2-4-7: Determine the Need to Monitor Aeration
If the treatment schedule is: Then:
A FIFRA Section 18 Exemption MONITOR the aeration of the commodity. FOLLOW
“Aerating the Enclosure” steps which follow.
A labelled treatment RELEASE the commodity and RELEASE the fumigation to
the fumigator for aeration.
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Materials Needed
2-4-30 Treatment Manual 03/2004-05
PPQ
If the fumigation is performed under a Section 18 Exemption, then a
PPQ officer must be present at the initiation of aeration and to verify
the final aeration readings.
Materials Needed
The following materials will be needed to aerate the enclosure:
◆ SCBA6
◆ Colorimetric tubes (Draeger or Kitagawa for example)
◆ Exhaust fan7
◆ Exhaust duct8
◆ Danger signs9
◆ Materials for limiting access to area (barricades, rope)10
◆ PPQ Form 429
The following procedures apply to the aeration of all tarpaulin
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