Retrieving samples using an 8- to 12-in. continuous flight auger is useful for determining existing layer thicknesses and for acquiring disturbed samples of all layer materials without resorting to trenching. This sampling technique can be particularly applicable for acquiring materials to determine the type and quantity of stabilizers for full-depth reclamation projects since the consistency of the retrieved materials is similar to those processed through a pavement reclaimer. Figure 4-23 shows a drilling rig with an auger bit attached.