The responsible HHS official, on the basis of a written application and any supporting evidence he or she may require, will approve financial assistance in excess of 80 percent if he or she concludes that the Head Start agency has made a reasonable effort to meet its required non-Federal share but is unable to do so; and the Head Start agency is located in a county:

(a) That has a personal per capita income of less that $3,000 per year; or

(b) That has been involved in a major disaster.