In carrying out the purposes of this part:
    
    
        
        (a) 
         Emphasis should be placed on encouraging recycling of scrap and junk where practicable, in accordance with the National Environmental Policy Act of 1969 (42 U.S.C. 4321, et seq. );
     
    
        
        (b) 
         Every effort should be made to screen nonconforming junkyards which are to continue as ongoing businesses; and
     
    
        
        (c) 
         Nonconforming junkyards should be relocated only as a last resort.