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   "* #   soil layer beneath the pavement      
     
               
    
  
      

     
 


     
 
   
      "prepared subgrade,"
      
  


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    graded aggregate foundation    
     

     Light duty pavements typically require a single layer of sand or stone dust       

   
 Heavy-duty pavements or weak sub-grades 

  additional layer of base material, called a µSub-base¶,  
   
        
        

 beyond the pavement edge to provide lateral support,      
 

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     maintenance of edges and vegetative invasion
    Monolithic paving  
  

  

 

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