MARK FOR SCRAPER
PLATE CENTER
EDGE
MARKS
MARK FOR DRILL
ROD CENTER
METHOD 1
METHOD 2
Figure 3–2. Marking the Test Area
Remove the drill rod by pulling straight up and twisting the extraction tool.
Do not loosen the drill rod by tapping from side to side with the hammer.
This will distort the hole or cause loose material to fill the 2-inch gap from
the bottom of the hole. Carefully pick up the scraper plate and set it aside.
Place the gauge on the surface prepared by the scraper plate so the source
rod can enter the hole without disturbing any loose material around it.
Using the handle and trigger mechanism, lower the source rod into the
hole. Release the trigger at the desired depth and listen for the “click,”
indicating that the source rod is properly locked into position on the index
rod. Lightly press the top of the handle to confirm positive source rod
locking. Gently pull the gauge to the right until the source rod is firmly in
contact with the side of the hole.
CAUTION
DO NOT use the source rod of the Model 3440 gauge to
drill holes.
SCRAPER
PLATE
SCRAPER
PLATE
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