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Figure 3 (Continued) <br /> 4. SOIL TYPES CONT'D. SIZE FIELD IDENTIFICATION <br /> Silts 42®0 + 5 Particles Mostly -200; barely <br /> Micron visible to naked a e. Some <br /> plasticity, and exhibits marked <br /> dilatancy (.Shaking test shows <br /> quick or "livery" condition.) <br /> Dries mod. quickly and can be <br /> dusted, off the fingers. Dry <br /> r4 lumps possess cohesion, but <br /> easily powdered in fingers. <br /> Loams Contain sand, silt and clay sizes ; <br /> �+ possess. mod. plasticity.. <br /> a� <br /> o Sandy Clay Mod. to high plasticity and dry <br /> U strength. No dilatancy. <br /> Silt-Clay Fine•grained (• 200) . No dilatancy. <br /> Appreciable plasticity. <br /> Smooth to touch Lean clays show <br /> and plastic, no these properties <br /> dilatancy. to low degree. <br /> Sticks td f ingers <br /> and dries slowly. <br /> Clay -5 Shrinks appreci- <br /> Micron ably on drying. <br /> Dry lumps can be <br /> broken but not <br /> powdered. They Fat clays show <br /> disintegrate under these properties <br /> water, to high degree. <br /> Feats Fibrous organic matter, usually brown <br /> or black in color. <br /> Firm Fibers compressed together. <br /> Spongy Very compressible and open <br /> structure. <br /> 5. PLASTICITY Non-plastic; slightly plastic; <br /> moderately plastic; highly plastic. <br /> Inherent property of soil. Moisten <br /> as necessary to evaluate plasticity. <br /> -15- <br />