ASTM D2487-00 pdf free.Standard Classification of Soils for Engineering Purposes (Unified Soil Classification System). ASTM D2487 describes a system for classifying mineral and organo-mineral soils for engineering purposes based on laboratory determination of particle-size characteristics, liquid limit, and plasticity index and shall be used when precise classification is required. 5. Significance and Use 5.1 This standard classifies soils from any...