The proposed works area is partly within the Wetland Buffer Area and the Wetland Conservation Area. It is also zoned as Conservation Area in the San Tin Outline Zoning Plan. Commercial fishponds are found in the Lok Ma Chau area to the east and west of the proposed works site but not in its immediate vicinity. Aligning the new viaduct next to the existing Huanggang Bridge to avoid further infringement into the Conservation Area would result in no significant ecological impacts arising from the proposed Project in these areas.