law: 4. Power to do preliminary Acts after publication of notice under section 3, sub-section (2).-
  It shall be lawful for such officer as the 1[Central Government] may, by general or special order, authorise in this behalf, and for his servants and workmen, at any time after publication of the notice mentioned in section 3, sub-section (2), to enter upon and survey and take levels of any land in such locality, to dig or bore into the sub-soil, to do all other acts necessary to ascertain whether any and, if so, what restrictions should be imposed on the use and enjoyment of the land, to set out the boundaries of the land upon the use and enjoyment of which restrictions are to be imposed, or of any part of such land, to mark such levels, boundaries and line by placing marks and cutting trenches, and, where otherwise the survey cannot be completed and the levels taken and the boundaries and line marked, to cut down and clear away any part of any standing crop, fence or jungle: Provided that no person shall enter into any building or upon any enclosed court or garden attached to a dwelling-house (unless with the consent of the occupier thereof) without previously giving such occupier at least seven days' notice in writing of his intention to do so.