Figure 16-1.—Typical boring log.

Figure 16-1.—Typical boring log. The soil profile (fig. 16-2) is a graphical The soil profile has many practical uses in the representation of a vertical cross section from the location, design, and construction of roads, airfields, surface downward through the soil layers. It shows the dams, and buildings. It greatly influences the location location of test holes and of any ledge rock encountered, of the finished grade line; these should, of course, be located so as to take full advantage of the best soils a profile of the natural ground to scale, field available at the site. The profile also shows whether soils identification of each soil type, thickness of each soil to be excavated in the course of construction are suitable stratum, profile of the water table, and profile of the for use in embankments or whether you require borrow finished grade line. Standard soil symbols should be soils instead. It may show the existence of undesirable used to indicate the various soil layers. The standard soils, such as peat or other highly organic soils; it may procedure is to add the proper color symbols also show the existence of bedrock too close to the representing the various soil types you discover. surface. It aids in planning drainage facilities since these 16-6