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PPQ
Treating Deck
Areas
Areas which may be pest contaminated or suspected of being
contaminated, such as the deck, hatch covers, drain channels,
crevices around hatches, hallways, and similar areas that cannot be
fumigated, should be treated with a 3 percent malathion emulsion
spray (0.5 pint, 57 percent premium grade to a gallon of water). Spray
at the rate of 2 gallons/1,000 sq. ft., or to the point of runoff.
Step 3—Determining Section 18 Exemptions and Sampling
Requirements
After selecting the treatment schedule, you will be able to determine if
the schedule is a FIFRA Section 18 Exemption by the presence of
broad, bold, vertical lines on the borders of the treatment schedule
table listed in the reference. Some treatment schedules are FIFRA
Section 18 Exemptions only at specific temperature ranges. Check the
treatment schedule and temperature to determine if the fumigation
will be a FIFRA Section 18 Exemption.
If food is fumigated, alert the captain that there may be higher than
permitted residues.
Step 4—Preparing Areas to Be Fumigated
Storerooms Open all bins, drawers, and cupboards. Stack all bagged commodities
so gas can penetrate all sides of the commodity. Stacking bagged
commodities on pallets will facilitate gas distribution and penetration.
Cargo Holds Prepare to fumigate the entire hold regardless of the location of the
infestation within the hold. If you want to fumigate a single deck (lower
hold, lower ’tween deck, upper ’tween deck, etc.), you must get
approval from your Regional Director. The decision to approve single
deck fumigations should only be made after all sections of the hold
have been inspected and there is no possibility of gas escaping to other
parts of the hold.
In most cases, it is unnecessary to open or rearrange cargo containers
within the hold. Occasionally, some rearrangement may be required to
ensure uniform gas distribution. Have the hatch coverings between
decks opened in such a manner as to permit adequate distribution
and circulation of the gas.
Step 5—Arranging and Operating Fans
Storerooms Storerooms normally require a minimum of two, 1,800 cfm fans. Place
one fan at a low level and the other at a high level. Fans with capacity
above 1,800 cfm create strong air currents which could result in gas
leakage around the seals. If you’re fumigating an area which includes
Malathion emulsion sprays may break down asphalt surfaces. For asphalt
surfaces, prepare a spray from a 25 percent wettable powder (1 pound to a
gallon of water), rather than the emulsion.
Chemical Treatments Fumigants • Methyl Bromide • Ship Fumigation
Preparing to Fumigate
2-6-6 Treatment Manual 10/2002-04
PPQ
the galley and adjoining storerooms, be sure to place the fans to evenly
distribute gas. Make certain that fans can be turned on and off from
an area outside the fumigation site.
Cargo Holds Use the volume of the hold (ft3) in determining how many fans you will
need. The total cfm’s of all the fans should approximate the volume of
the hold. Use fans capable of 2,500 cfm or greater during gas
introduction and for 30 minutes following the introduction. Placement
of fans within holds depends on the presence or absence of cargo.
Normally, place two fans in the lower hold at opposite ends facing
across the hold. The number of fans can be reduced by using fans
greater than 2,500 cfm. Fans should be labeled as to location and
have the capability of being turned on and off individually in case of
low readings in certain locations or pockets of gas.
Test all fans to ensure that they are in good operating condition.
Operate fans during the gas introduction and for 30 minutes after
introduction is completed.
Step 6—Placing Gas Sampling Tubes
Place gas sampling tubes in areas and commodities which will give
representative samples within the fumigated area. Have all leads
brought to one central point at least 30 feet up- wind from the area being
fumigated. Label all gas sampling tubes so they can be easily identified
when you take concentration readings. Label each tube by identifying
the level of the hold and whether the gas sampling tube is in a
commodity or space.
Storerooms Place a minimum of two gas sampling tubes in open space and at least
one gas sampling tube within the commodity considered to be the
most difficult for the fumigant to penetrate.
Cargo Holds Within cargo holds, the exact location will depend primarily on the
location of cargo within the hold. Place a minimum of two leads for
each level of empty hold space. The average size hold of three levels is
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