In consultation with the council of the municipality and the agencies notified under section 21 (1) , the Commission must, within such period as the Minister may allow, prepare a draft integrated assessment report and –

(a) cause a copy of the draft report, and any submissions received under section 21 (2) , to be placed on public exhibition at its office for a period of at least 28 days; and

(b) advertise, as prescribed, the exhibition of the draft report.