The Chief Executive Officer may authorize any person to enter into or open any land or building with or without assistance, for the purposes of,
[a] making any inquiry, inspection, measurement or survey or taking levels of such land or building;
[b] examining works under construction or of ascertaining the course of sewers or drains ;
[c] ascertaining whether any building is being or has been erected or re-erected without sanction or in contravention of any sanction given under this Act or the rules and regulations made thereunder and to take such measurements and do any such other acts as may be necessary for such purpose ;
[ [C-1] digging or boring into the sub soil ;
[C-2] setting out boundaries or intended lines of work ;
[C-3] making such level, boundaries and lines by placing marks and cutting trenches ;
[C-4] ascertaining whether any land is being or has been developed in accordance with the Plan and in accordance with the terms and conditions stated in the permission. ]
[d] doing any other thing necessary for the efficient administration of this Act :
Provided that
[i] no such entry shall be made except between the hours of sunrise and sunset and without giving reasonable notice to the occupier, or if there be no occupier, to the owner of the land or building ;
[ii] sufficient opportunity shall in every instance, be given to enable women, if any, to withdraw from such land or building ; /be
[iii] due regard shall always be had, so far as may be compatible with the exigencies of the purposes for which the entry is made, to the social and religious usages of the occupants of the land or building entered.