Campbell Scientific EnviroSCAN Sentek Water Content Profile Probe - Manual (Page 34)

Appendix C. Access Tube Installation
11. Use a sledgehammer to tap the dolly until the access tube is embedded
approximately 5-10 cm into the soil.
12. Place the auger inside the access tube and turn the auger handle. Auger
ahead of the access tube by approximately 20 cm (until the pen mark made
in Step 6 is flush with the top of the access tube).
13. Take the auger out of the tube and empty the soil using the small auger
cleaning tool no. 1.
14. Select dolly no. 1 or dolly no. 2 and re-insert it into the top of the access
tube.
15. Use the sledgehammer to drive the access tube further into the pre-drilled
hole.
16. When you reach the bottom, remove the dolly. Again, auger ahead of the
access tube by approximately 10-20 cm. Alternate between auguring and
hammering until the dolly resting on top of the access tube touches the top
of the tripod.
17. Insert dolly no. 3 and continue hammering and auguring until the mark on
the dolly is level with the top of the tripod.
18. Remove the tripod by inserting the tommy bars into the holes of the tripod
pins and pulling them upward with a twisting motion.
19. When all pins are removed carefully lift the tripod straight upward and off
the access tube.
20. Try twisting and moving the access tube. It should not move. There
should be no air gaps.
21. If there is an air gap, retrieve the access tube and start the installation
process again at a site that is at least one meter away from the failed
installation.
C.1.3 Cleaning the Access Tube
The access tube must be cleaned before the top cap is installed and readings are
taken. The bottom stopper is installed after cleaning in all soils except very
wet and saturated soils. The type of soil at the installation site will determine
which of the three cleaning methods is to be used. For instance, if you have
dry/moist sandy to loamy soil conditions:
1. Detach auger head and attach cleaning tool no. 2 – foam.
2. Plunge foam tool up and down length of access tube.
3. Remove loose soil, dry sand, etc. from the bottom of the access tube by
using cleaning tool no. 1.
4. Turn tool few times at the bottom of the access tube until sand collects on
top of the spiral. Pull tool up and retrieve the material.
C-4