The core drilling market is just as focused on speed as foundations. We don’t suggest buying used core drilling rigs. They’re usually owned by construction companies that are always buying capital equipment anyway, and so they want to go with what’s easy to maintain and what’s going to work and when something’s depreciated out they get the next piece of equipment.
Maneuverability matters for geotechnical drillers. If you’re planning a lot of work along the highway, checking for salt intrusion for example, truck mounted rigs are the most sensible. For work around, say, a gas station, we recommend a remote track mounted system. As for drilling methods, auger and sonic are two of the most effective ways to go if sampling.