From MOS139
7.18 Procedures for aerodrome operators to deal with obstacles in the OLS
(1) An aerodrome operator must:
(a) monitor the OLS for the aerodrome; and
(b) report to CASA, in writing, any infringement, or potential infringement, of the OLS.
(2) When a new obstacle is identified, the aerodrome operator must ensure that pilots are informed of it by NOTAM.
(3) For subsection (2), unless otherwise stated in the data product specification (DPS) for the aerodrome, the information must include the following:
(a) the nature of the obstacle;
Note For example, whether the obstacle is a structure or machinery or of another kind.
(b) the distance and bearing of the obstacle from:
(i) if the obstacle is within the take-off area — the start of the take-off end of the runway; or
(ii) the ARP;
(c) the height of the obstacle in relation to the aerodrome elevation;
(d) if it is a temporary obstacle — the time during which it is a temporary obstacle.
Your're stuck with them.