If, on expiry of a period of two years from notification of the grant, the operation in respect of which it was awarded has not begun to be carried out, the prefect shall declare that his decision to award the grant has lapsed.
However, in the case of operations that can be carried out in the short term, the Prefect may set a time limit of less than two years.
For the application of the first paragraph, the Prefect may, in the light of the justification provided, extend the validity of the awarding order for a period that may not exceed one year.