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, <br /> ' <br /> ' UNIFIED SOIL CLASSIFICATION SYSTEM <br /> ' (CL) Inorganic clays of low to medium plasticity, sandy clays, silty clays <br /> (SW) Well graded sands and gravely sands, little or no fines <br /> ' (SP) Poorly grad,ed sands and gravely sands, little or no fines <br /> (GW) Well graded gravels and gravel-sand mixtures, little or no fines <br /> (SC) Clayey sands, sand-clay mixtures <br /> ' (GC) Clayey gravels, gravel-sand-clay mixtures <br /> (SM) Silty sands, sand-silt mixtures <br /> ' (OL) Organic silts and organic silty clays of low plasticity <br /> (OH) Organic clays of inedium to high plasticity <br /> (Pt) Peat, muck, and other highly organic soils <br /> ' (ML) Inorganic silts, rock flour, silty or clayey fine sand <br /> (CH) Inorganic clays of high plasticity, fat clays <br /> , (MH) Inorganic silts, micaceous or diatomaceous silts, elastic silts <br /> (GP) Poorly graded gravels and gravel-sand mixtures, little or no fines <br /> , <br /> 1 <br /> ' <br /> ' <br /> ' <br /> � <br /> ' <br /> ' <br /> ' <br /> ' <br />