Hollow-stem auger drill rigs have many components which make up the drill rig. Which item is not generally part of the package?

• A. Sampling bailer
• B. Drill rods
• C. Down the hole hammer and float sub
• D. Mud pump

Answer: (C)

Hollow-stem auger rigs are built around quickly advancing a bore with hollow auger sections and retrieving samples with a bailer, so the kit focuses on components that support augering and sampling rather than percussion drilling. A down-the-hole hammer is a percussion drilling tool used to break up hard rock, and a float sub is a fluid-management piece associated with that kind of drilling hardware. Those items aren’t typically included in a hollow-stem auger package because this method relies on rotating augers to progress the bore and on a bailer to obtain groundwater samples. In a standard hollow-stem auger setup you’d expect items like a sampling bailer and drill rods to extend the auger string, and sometimes a mud pump to assist if fluids are used, but not the DTH hammer or float sub.