53. (1) The Chief Executive Officer or any person either generally or specially authorised by him in this behalf may, with or without assistants or workmen, enter into or upon any land in order- (a) to make any inspection, survey, experiment, valuation, or enquiry; (b) to take level of such land; (c) to dig or bore into the sub-soil; (d) to set out boundaries and intended lines of work;(e) to make such levels, boundaries and lines by placing marks and cutting trenches; or (f) to do any other thing; whenever it is necessary to do so for any of the purposes of this Ordinance or any rules made thereunder or for the preparation or execution of any development scheme under this Ordinance: Provided that no such entry shall be made without giving the occupier of the land at least twenty-four hours' previous notice of the intention to make such entry.