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portable ducts to evacuate gas from storerooms to outside, downwind
areas away from crew areas, preferably on the offshore side of the
ship. Do not point the ducts upward, since dissipation onto the deck
may occur. Use the ship’s aeration/ventilation equipment if possible.
Make sure that use of ship’s equipment will not distribute the
exhausted gas to other areas within the ship.
TABLE 2-6-2: Determine Time for Extended Exposure
If the exposure time is:
And the reading is
below minimum by: Then extend exposure:
Less than 12 hours 10 oz. or less 10 percent of the time lapse since the
last reading
11 oz. or more 30 minutes
12 hours or more 10 oz. or less 10 percent of the time lapse since the
last reading
11 oz. or more 2 hours or 10 percent of time lapse
since last reading, whichever is greater
TABLE 2-6-3: Determine the Responsibility for Monitoring the Aeration
If the treatment schedule is: Then:
A FIFRA Section 18 Exemption MONITOR the aeration of the commodity. FOLLOW
“Aerating the Hold or Storeroom” steps which follow.
A labelled treatment RELEASE the fumigation to the fumigator and RELEASE the
ship.
Chemical Treatments Fumigants • Methyl Bromide • Ship Fumigation
Aerating the Hold or Storeroom
10/2002-04 Treatment Manual 2-6-13
PPQ
Aerating the Hold or Storeroom
Step 1—Securing the Area
Assuming that you’ve already restricted access and secured the
fumigation area, you now must restrict access to the area where the
exhaust duct extends beyond the enclosure. During the first 10
minutes of aeration, there should be no people within 200 feet of the
exhaust duct outlet. When securing the duct outlet area, consider the
direction of the wind. Face the duct outlet toward an open area, and
away from people. Point the duct outlet upward to aid in dispersing
the exhausted gas.
Have the fumigator use a physical barrier such as ropes, barricades,
or walls to secure the area.
Placard the secure area near the exhaust outlet with the appropriate
DANGER/PELIGRO signs. Make sure the placards meet the
appropriate fumigant label or labeling requirements. The skull and
crossbones should be present as well as “AREA UNDER FUMIGATION,
DO NOT ENTER/NO ENTRE”; date of the fumigation; name of the
fumigant used; and the name, address, and telephone number of the
fumigator.
Unless you authorize their use, do not allow motorized vehicles to
operate within the secure area.
Step 2—Aerating the Area
Wearing the SCBA, advise the fumigator to make an opening (if
possible) at the end furthest from the exhaust duct to allow entry of
fresh air. The fumigator may open doors, hatches, tarpaulins, and
areas to facilitate aeration. Start the exhaust system (minimum 3,500
cfm exhaust fan connected to an exhaust duct) and aerate the hold or
storeroom.
Step 3—Taking Concentration Readings to Determine When to
Release the Ship
Stop the aeration fans. Take a concentration reading with a
colorimetric tube in the exhaust duct within 2 feet of the storeroom or
within the first 2 feet of the exhaust duct where it exits the hold. If the
concentration is above 5 ppm, but less than 100 ppm, advise the
fumigator to remove the tarpaulin while wearing a SCBA.
Release the ship when the following conditions are met:
For Storerooms When the concentration is 5 ppm or less after taking readings 4 feet
from the floor and 1 foot inside the fumigation perimeter at several
representative locations (a minimum of two are required).
For Holds When the concentration is 5 ppm or less after taking readings by:
Chemical Treatments Fumigants • Methyl Bromide • Ship Fumigation
Aerating the Hold or Storeroom
2-6-14 Treatment Manual 10/2002-04
PPQ
1. Drawing a sample for a minimum of 1 minute through a
sampling tube with the auxiliary pump. The sampling tube
should be teflon or metal to obtain accurate readings. If a
polyethylene sampling tube is used, it should be replaced at
frequent intervals due to adsorption of gas by the polyethylene.
2. Taking a concentration reading with a colorimetric tube in the
sampling tube.
3. Taking a minimum of two readings for each level of the hold.
Record the date, concentration reading, and time on PPQ Form 429.
10/2002-04 Treatment Manual 2-7-1
PPQ
Treatment Manual
2 Chemical Treatments 7
Fumigants • Methyl Bromide •
Structure Fumigation
Contents
Methods and Procedures page-2-7-1
Materials Needed page-2-7-2
PPQ Officer Provides page-2-7-2
Fumigator Provides page-2-7-2
　
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