(b) Some of the most frequently used allowable costs include:
- (1) Historical, architectural, or archeological research necessary to implement and carry out project work;
- (2) Architectural, engineering, or contractor fees necessary to implement and carry out project work;
- (3) Expendable supplies and materials;
- (4) Rental or lease of project equipment;
- (5) Exterior restoration; and
- (6) Structural repairs.