WestConnex M4-M5 link : Rozelle Interchange - modification : Iron Cove ventilation underground : modification report

This Modification Report (report) provides the environmental assessment for the proposed modification to the M4-M5 Link project) (the project) in accordance with Section 5.25 of the Environmental Planning & Assessment Act 1979 (NSW) (EP&A Act). The proposed modification relates to the Rozelle Interchange stage of the project (Stage 2) and specifically, works at Iron Cove. This report includes: • An overview of the approved project • A description of the proposed modification to the approved project • An assessment of the potential environmental impacts of the proposed modification • Details of the changes to the conditions of the project approval required by the proposed modification • Details of the changes to the approved environmental management measures required by the proposed modification • Justification for the proposed modification. The Environmental Impact Statement (EIS) described an electrical substation and ventilation exhaust facility located in separate buildings on the surface that together would comprise the Iron Cove Motorway Operations Complex 4 (MOC4). The proposed modification would relocate the MOC4 underground, including the electrical substation and ventilation facilities (the ventilation outlet would remain above ground in the same location). Only a switch room, high voltage regulators, an alternative Operational Motorway Control System (OMCS) room and a stair access leading down to the ventilation tunnel would be required on the surface. The proposed modification is described in section 1.6 and in more detail in Chapter 5 (Proposed modification).