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Use the single lowest commodity
temperature for determining the dosage
rate (Do Not use the average commodity
temperature).
Lower than the commodity
temperature
By 9 degrees or
less
By 10 degrees or
more
Use the average of the single lowest air
and commodity temperatures for
determining the dosage rate (Never
initiate a fumigation if any commodity
temperature reads lower than 40°F.)
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Preparing to Fumigate
2-4-16 Treatment Manual 03/2004-05
PPQ
Record the temperatures in Block 22 of the PPQ Form 429.
Step 11—Covering the Stack
After covering the stack, check the tarpaulin for rips, tears, and holes.
Look at the spots that have been taped, and verify they are properly
sealed. Have the fumigator repair all holes.
The tarpaulin should be made of a material such as vinyl, polyethylene
plastic, or coated nylon. 4 mil vinyl or polyethylene plastic tarpaulins
are only approved for one usage; 6 mil vinyl or polyethylene plastic
tarpaulins may be used up to four times with the officer’s approval for
each usage; 10 to 12 mil rubber or plastic coated nylon tarpaulins
may be approved for multiple use with the officer’s approval for each
usage.
The fumigator should cover all corners and sharp ends with burlap or
other padding to prevent the tarpaulin from ripping. Have the
fumigator pull the tarpaulin over the stack, being careful not to catch
or tear the tarpaulin. Make sure there is sufficient structural support
to raise the tarpaulin 2 feet above and 1 foot beyond the sides of the
commodity.
The tarpaulin must be large enough to provide a floor overlap of at
least 18 inches around all sides of the stack. Carefully lay the
tarpaulin out to prevent excess folds or wrinkles along the floor,
especially around corners.
Step 12—Sealing the Tarpaulin
Sealing may be accomplished with loose, wet sand, sand snakes, water
snakes, adhesives, or a combination. If there is danger of crushing or
crimping the gas sampling or introduction tubes, use the loose, wet
sand. If using snakes, use two rows of snakes along the sides and
three rows on the corners. The snakes should overlap each other by
approximately 1 foot. The goal in sealing the tarpaulin is to get the
Important
When the commodity and air temperature drastically differ, moisture may
condense inside the gas sampling tubes or inside the T/C unit and cause
inaccurate gas concentration readings. Check the gas sampling tubes
frequently for possible puddling of condensed water, and drain it off, as
needed, before taking a reading. Also, check the Drierite frequently, and
change it as soon as it becomes saturated with water [turns pink], to obtain
true gas concentration readings. Never fumigate commodities that are frozen.
Important
Sealed containers and vans cannot be considered as "fumigation chambers,"
and therefore must be covered by a tarpaulin, unless they can pass the
pressure-leakage test.
However, refrigerated containers (reefers) may be fumigated without a
tarpaulin if specific requirements are met. See "Special Procedures for
Container Fumigations Without a Tarpaulin.
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Preparing to Fumigate
03/2004-05 Treatment Manual 2-4-17
PPQ
tarpaulin to lie flat against the floor to prevent gas from leaking out.
When wind is not a factor, plastic tape may be used for sealing the
tarp. The tarp must be at least 2 inches in width, and applied (only to
a smooth surface) with the aid of high-tack spray adhesive.
Seal corners by laying two sand snakes around the corner and
working the tarpaulin until it is flat. Place a third snake on top of the
two other snakes to provide additional weight to force the tarpaulin
against the floor. Loose, wet sand can be used in the area where the
gas introduction line, electrical cords, and gas sampling tubes extend
from under the tarpaulin.
Step 13—Measuring the Volume
Using a 100-foot tape measure, carefully measure the length, width,
and height of the enclosure. Never estimate the measurements. An
error in measurement of as little as 12 inches can result in
miscalculation of the dosage by as much as 15 percent. When
measuring, round off to the nearest quarter foot (example—3 inches =
.25 feet). In the case of fumigations of edible commodities, an error can
result in an unacceptable level of residue on the commodity. If the
sides of the enclosure slope outward from top to bottom, measure both
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