Lesson 3/Learning Event 3
Step 3. Carefully pour the extraction fluid into the soil extraction bag, leaving the solid drying agent
in the bottle.
Step 4. Reseal the top of the soil extraction bag.
Step 5. Hold the seals at the top and bottom of the bag in one hand. With the other hand, gently
knead the contents of the bag for approximately three minutes to extract any chemical agent that
may be in the soil sample. Take care not to squeeze out any of the contents.
Step 6. Remove the clip. Unfold the bottom of the bag and insert it in the extraction fluid bottle.
Step 7. Gently squeeze the fluid from the bag into the bottle. Take care not to force any soil into
Step 8. Remove the bag from the bottle and reseal the bottom of the bag.
Step 9. Recap the extraction fluid bottle tightly and reseal the bottle with the pressure-sensitive
tape. Mark the bottle to identify the soil extract with the soil sample.
Step 10. Place the soil extraction bag in a soil collection bag and seal the bag with the attached tie
Step 11. Place the processed soil sample and the extraction fluid bottle in the soil sampling kit.
Step 12. Forward both the soil extract and the soil sample to the General Chemical Laboratory for
The Procedure for Collecting a Sample of an Unknown Chemical Agent on Surfaces. This
procedure is performed according to the following steps.
Step 1. Remove the seal and cap from an extraction fluid bottle, and using a fresh applicator each
time, repeat steps 2 through 5 below four times.
Step 2. Dip the applicator into the bottle to wet it.
Step 3. Roll or rub the tip over a small area of the surface (figure 31 on page 64).
Step 4. Place the applicator tip in the extraction fluid bottle; then snap off the upper part of the
Step 5. When sampling is completed, recap and reseal the bottle.