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I UNIFIED SOIL CLASSIFICATION SYSTEM k <br />(CL) <br />I Inorganic clays of low to medium plasticity, gravelly clays, sandy clays, silty clays, lean clays <br />(SW) <br />( Wel graded sands and gravelly sands, little or no fines <br />(SP) <br />I Poorly graded sands and gravelly sands, little or no fines <br />(GW)Well graded gravels and gravel—sand mixtures, little or no fines <br />(SC) <br />I Clayey sands, sand—clay mixtures <br />(GC) <br />i Clayey gravels, gravel—sand—clay mixtures <br />(SM) <br />I Silty sands, sand—silt mixtures <br />(OL) <br />Organic silts and organic silty clays of low plasticity <br />(OI) ( <br />Organic clays of medium to high plasticity <br />(Pt) <br />Peat, muck, and other highly organic soils <br />(ML) I <br />Inorganic silts, rock flour, silty or clayey fine sand <br />(CI) <br />Inorganic clays of high plasticity, fat clays <br />(MIT), <br />Inorganic silts, micaceous or diatomaceous silts, elastic silts <br />(GP) <br />Poorly graded gravels and gravel—sand mixtures, little or no fines <br />(GM), Silty gravels, gravel—sand—silt mixtures <br />