Hollow-stem auger drilling is considered a shallow
drilling method with maximum depth of drilling of 200 to 300
ft (60 to 90 m) depending on torque and pull down/retract
capacity of the drilling equipment and subsurface conditions of
the formation(s) encountered. Saturated loose unconsolidated
deposits further limit maximum depth that can be attained.
HSA can act as casings set through unconsolidated surficial
soils and drilling can be converted to other methods (see 2.5)
for deeper drilling.