Campbell Scientific Sentek EnviroSCAN Access Tube Installation Guide - Manual (Page 36)

Installing EnviroSCAN, EnviroSM ART & Diviner 2000 access tubes
© Sent ek Pt y Lt d Page 33
Gravelly soils
If you encounter a layer of small stones or gravel and the 47.0 mm regular auger is unable to proceed, attach
the 47.0 mm Open Centre Tungsten Tip Auger. This auger is capable of breaking up and retrieving gravel of
up to thumbnail size under most conditions.
If you encounter larger stones, attach the 47.0 mm rockbreaker to the reinforced auger extension rod and fit
the Heavy Duty T-Handle. This will allow occasional large stones to be broken.
Under very dry or wet conditions, you may need to attach the Access Tube Spiral Cleaning Tool to remove
very dry and loose sand or gravel in liquid mud. When you have passed this obstacle you can continue
augering using the Standard Manual Installation Method.
Extremely dry and loose sand
If you are installing access tubes into very dry and loose sand there could be problems with the augered
material falling out of the auger when you pull it out of the access tube. If this occurs use the Access Tube
Spiral Cleaning Tool as the augering device. The one-turn metal spiral tool does an excellent job retrieving
the material in these conditions.
Water tables
On sites with a perched or shallow water table, water will enter the bottom of the access tube hole. Use the
access tube bailer to remove water and liquid mud between each augering. Lower the bailer into the bottom
of the access tube, wait a few seconds for it to fill, then pull the bailer up and empty it into a bucket. You will
only be able to dig a certain distance into completely saturated soil, until conditions become too sloppy to
continue work. The bottom stopper will need to be ready for immediate installation after retrieving the last
auger load.