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location. Indicate if tube is in a commodity prior to fumigation and at
the point where the concentration readings will be taken. For safety
purposes, the gas sampling tubes should extend a minimum of 30 feet
up-wind from the enclosure. You should have extra tubing on hand to
extend beyond 30 feet if necessary.
Step 7—Measuring the Temperature
Take temperature readings of the air (space) and of the commodity.
Use a calibrated thermometer. Record the temperatures in Block 22 on
the PPQ Form 429. If the temperature is below the minimum listed for
the treatment schedule, then you will have to heat the space to be
fumigated or wait until the temperature rises to the level required by
the schedule treatment.
TABLE 2-7-1: Deterimne the Number of Sampling Tubes
If the size of the enclosure is: Then use:
500,000 ft3 or less Six sampling tubes for the first 100,000 ft3, and
Add one tube for each additional 50,000 ft3
Greater than 500,000 ft3 Fourteen sampling tubes for the first 500,000 ft3, and
Add one tube for each additional 200,000 ft3
Chemical Treatments Fumigants • Methyl Bromide • Structure Fumigation
Preparing to Fumigate
2-7-10 Treatment Manual 10/2002-04
PPQ
Step 8—Sealing the Structure
Depending upon the method of fumigation, interior fumigation or
tarpaulin fumigation, the effort required in this step will vary greatly.
Tarpaulin
Fumigation
Locate and seal all openings which have the potential to leak gas.
Since the entire structure will be tarped, do not cover openings to the
exterior of the structure such as doors, windows, and air vents. Look
for and seal all openings which may lead outside the structure such as
manhole covers, drain pipes, and vent pipes. Seal these types of
openings with polyethylene, tape, putty, or a combination of these
materials. Do not seal out recessed areas, ducts, or similar areas
which may harbor an infestation.
The structure or portion to be fumigated must be transformed into a
gastight fumigation enclosure. This is accomplished by covering the
entire structure with a 6 mil or greater, polyethylene tarpaulin.
Tarpaulins may be joined together with mastic and tape or rolled and
clamped together.
Have padding, such as burlap, placed on all corners of the structure
and in any area where the tarpaulin may rub against rough or sharp
edges of the structure.
Interior
Fumigation
One of the most important steps in preparing for a structure interior
fumigation is sealing all openings and areas which have the potential
to leak gas. Consider the entire area to be fumigated as a natural
atmospheric chamber and make the area as gastight as possible. The
most important task is to locate all openings (example—drain pipes,
or air ducts) and seal them.
Do not seal out or make gastight recessed areas, ducts, or similar
apertures which may harbor infestations. In some cases, it is better to
seal sources of leaks from the outside of the area to be fumigated. Use
caulk compound or tape for sealing small spaces. For sealing larger
areas, use polyethylene or similar material secured with tape or
adhesive spray. Seal doors and other openings with either
polyethylene or spray with vinylite plastic. When practical, seal air
ventilation ducts on the outside of the space being fumigated so
sealing tape can be removed when you get ready to evacuate the gas
and begin aeration. Large openings should be covered with
polyethylene and securely taped.
Step 9—Measuring Volume
For rectangular and square shaped buildings, multiply the length,
width, and height. If the buildings are irregular, the volume of each
unit can best be calculated separately and then added together.
Chemical Treatments Fumigants • Methyl Bromide • Structure Fumigation
Preparing to Fumigate
10/2002-04 Treatment Manual 2-7-11
PPQ
Step 10—Calculating Dosage
The formula for calculating dosage is:
EXAMPLE: A structure infested with khapra beetle has a volume of
100,000 ft3. The space and commodity temperature is 65 °F. The
treatment schedule requires 6 lbs. MB/1,000 ft3 at 65 °F. To calculate
the dosage multiply the volume (100,000 ft) by the dosage rate (6 lbs.
MB/1,000 ft). This equals 600 lbs. of MB needed for the dosage.
Step 11—Placing the Gas Introduction Line(s)
Introduce MB from the outside of the building with the introduction
line going under the tarpaulin and directly into the airstream in front
of a fan. Use the “hot gas” method of gas introduction by passing the
fumigant through volatilizers after it leaves the cylinders. Depending
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