You are looking at a schedule for the Public Works Act 1981. This schedule is called 'Act administered by Ministry of Works and Development'. It is marked as repealed, which means it is no longer in use. The Ministry of Works and Development used to be in charge of this act. It was given the power to do this by section 6 of the act, which you can read more about here. This schedule has more information about the act. You can find more details about the act and its schedules, but this particular schedule is no longer used.