Before circulating a DEIS for external review, the official responsible for the DEIS shall receive the concurrence of the Associate Administrator for Planning and Evaluation and the Chief Counsel; and prepare a memorandum for approval by the Administrator which shall:
    
    
        
        (a) 
         Set forth the basis on which it was determined that a potentially significant environmental effect exists;
     
    
    
        
        (c) 
         Identify the Federal, State, and local agencies and private sources from which comments on the DEIS are proposed to be solicited (see Attachment 2);  1 and
     
    
        
            Code of Federal Regulations
        
        
            
            Footnote(s):
            
                
                    1 Filed as part of the original document.
            
            
        
    
    
        
        (d) 
         Include a recommendation on whether a public hearing on the proposed action should be held.