Rock core sampling is utilized to determine the physical and chemical nature of rock. Bedrock is usually encountered under soil overburden that varies widely in thickness. The overburden is typically sampled using a hydraulic push method until bedrock is encountered. Drilling techniques are then changed in order to sample the bedrock using a coring bit to collect a continuous rock core, or an air/mud rotary bit that brings rock chips to the surface for sampling. Rock cores are analyzed in the field by Geologist/Environmental Scientists to examine the core sample with respect to rock type, color, composition, bedding, structure, hardness, porosity, degree of weathering, and determine the rock quality designation (RQD).
