Drilling and soil sampling can be accomplished with a
variety of HSA systems. Types of systems can be chosen
depending on the advantages of handling, sampling
requirements, and subsurface conditions. There are two basic
types of systems. One type of system uses inner drill rods or
hex rods connecting the sampler or pilot bit assembly to the
surface for advancing and retrieving the sampler barrel or pilot
FIG. 5 Example of Drive Case Sampling Through HSA
D6151/D6151M − 15
bit assembly (Fig. 16 and Fig. 25). Another system uses a
wireline latching system in the HSA column to lower, latch,
and retrieve a core barrel or pilot bit assembly (Fig. 35).