Soil Identification is the most important part of the bore. Before you design a drilling fluid mix and purchase your bit or reamer, you must have a good understanding of the ground conditions. The exact soil type or the point where it changes over may never be spot on, but we must be close if we want a successful bore.
At the top of the CETCO Successful Borehole diagram are “planning” and “soil identification.” These two phases are the two most important parts of a successful borehole. Without planning, you will not have the correct materials onsite. I would go further and put soil identification at the very top because ground conditions can affect every part of a plan.