Lesson 2/Learning Event 2
Figure 17, following, shows the complete classification chart. Notice that the soil classifications are
arranged in descending order of construction durability from left to right and from top to bottom
(excluding PT). That is, the very best construction material is GS soil and the very worst is OH,
generally speaking. For example, if you were given a choice between a GP-GM soil and a SC soil for
construction purposes you could determine that GP-GM was better because of its placement on the
USCS table.
Figure 17 has been designed as a job aid to help you classify soils. Use it when you do the practice
exercise.
FIGURE 17. SOIL CLASSIFICATION CHART
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