(1) Where the owner or occupier, as the case may be, refuses or fails to comply within such reasonable time as may be fixed by the Board with the terms of any Order issued under this section, or where the Board deems it necessary, the Executive Secretary of the Board or its agents, may enter upon the land having previously given at least 24 hours notice to the owner or occupier of the land and may carry out the works specified in the Order.
(2) Where the Executive Secretary of the Board or its agents carries out any works under subsection (1) the reasonable costs incurred by them in so doing may be recovered from the owner or occupier, as the case may, as a debt due to the Board.
(3) A certificate signed by the Executive Secretary stating the reasonable cost of the works shall be prima facie evidence of its contents.