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: \r\n• An overview of the approved project \r\n• A description of the proposed modification to the approved project \r\n• An assessment of the potential environmental impacts of the proposed modification \r\n• Details of the changes to the conditions of the project approval required by the proposed modification \r\n• Details of the changes to the approved environmental management measures required by the proposed modification \r\n• Justification for the proposed modification. \r\nThe 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).

本变更报告（下称“本报告”）依据《1979年新南威尔士州环境规划与评估法》（Environmental Planning & Assessment Act 1979 (NSW)，下称《EP&A法》）第5.25条，针对M4-M5连接道项目（下称“本项目”）的拟议变更开展环境评估。本次拟议变更涉及本项目的莱卡特互通（Rozelle Interchange）二期（Stage 2），具体为铁湾（Iron Cove）区域的相关工程。本报告涵盖以下内容：
• 已获批项目概况
• 已获批项目的拟议变更说明
• 拟议变更的潜在环境影响评估
• 拟议变更所需的项目审批条件调整细节
• 拟议变更所需的已批准环境管理措施调整细节
• 拟议变更的合理性依据。

此前发布的环境影响报告书（Environmental Impact Statement, EIS）提及，两座独立地面建筑内分别设置变电站与通风排气设施，二者共同组成铁湾高速公路运营综合设施4号（Iron Cove Motorway Operations Complex 4, MOC4）。本次拟议变更将把MOC4迁至地下，涵盖变电站与通风设施（通风出口仍将保留在原地面位置）。地面仅需设置配电室、高压调压装置、备用高速公路运营控制系统（Operational Motorway Control System, OMCS）机房，以及通往通风隧道的楼梯出入口。本拟议变更已于1.6节进行说明，并将在第5章（拟议变更）中展开详细阐述。