Colajmns 7 & S* Material Classification. Two classification systems are pre- 

 sented: the USDA system used by the United States Department of Agriculture 

 in determining the textural classes of soils and the Unified system used by 

 engineers. 



Column 9. Permeability. The property of a soil which permits water to move 

 through it under saturated conditions is called its permeability. Permea- 

 bility is measured in inches per hour. 



Column 10. Subsoil Erodibility Class. Erodibility refers to the rate that 

 soil will erode when other factors affecting erosion are constant. For this 

 study, low, moderate, and high erodibility classes are recognized. The 

 classes used are related to annual losses in tons per acre. 



ColTJmn 11. Biochemical Renovation Potential. This column indicates the 

 estimated potential of the soils to renovate surface applied leachate through 

 biochemical action. It is based on experimental results of selected soils 

 and is expressed in relative terms of low, moderate, and high. 



