165   Inspections and investigations

For the purposes of this Act, an authorised officer who enters land under any power of entry conferred by this Division:

(a)  may inspect the land, and

(b)  may, for the purposes of an inspection, dig up any ground and take such measures as are necessary to ascertain the character and condition of the land and of any building, structure or work that is situated in, on or over the land, and

(c)  may make surveys and take levels and, for those purposes, may dig trenches, break up the soil and set up any posts, stakes or marks, and

(d)  may take samples or photographs in connection with any inspection.