An application for an appeal inspection may be refused if:
    
    
        
        (a) 
         The reasons for the appeal inspection are frivolous or not substantial;
     
    
        
        (b) 
         The quality or condition of the processed product has undergone a material change since the inspection covering the processed product on which the appeal inspection is requested;
     
    
        
        (c) 
         The lot in question is not, or cannot be made accessible for the selection of officially drawn samples;
     
    
        
        (d) 
         The lot relative to which appeal inspection is requested cannot be positively identified by the inspector as the lot from which officially drawn samples were previously inspected; or
     
    
        
        (e) 
         There is noncompliance with the regulations in this part. Such applicant shall be notified promptly of the reason for such refusal.