SNRP Option 2

SNRP 2 revised

Background

This section presents a less satisfactory design solution than the preferred design (SNRP Option 1) as it is only a small variation to the Reference Design. It is has been included here as a feasible variation (‘further option’) to the Reference Design that may fit within the current project boundary.

However, it still comes at a cost to parkland and does not avoid significant long term impacts on the health and wellbeing of residents and the local environment.

It is appreciated that the tenderers are expected to propose variations to the Reference Design that may avoid, mitigate or manage the impacts. However it is also understood that the tenderers are expected to deliver the lowest cost bid within the project boundary. As a result they are constrained in their ability to develop innovative design variations that significantly reduce impacts as we understand that the tender assessment will be completed by Treasury and independently of the Assessment Committee and the community.

Should the CIS be approved and the SNRP’s preferred design (Option 1) be rejected by the Committee, it is hoped that the Committee would place stringent conditions on the approval to ensure the significant impacts on Royal Park are mostly avoided in the development of the final designs.

There are better ways to make the connection from the tunnel to City Link given that the SNRP has developed many alternative designs since May 2013 and presented the latest iteration in the submission to the Committee in December 2012.

The City of Melbourne has adopted a similar approach to SNRP Option 2 for one of the designs that were included in the Council’s submission to the Committee.  Interestingly, the SNRP presented it designs to the Council in August 2013.

SNRP opt 2

Design Description

The above map describes the design of the SNRP option 2 on Ross Straw Field.

The small but critical change that has been introduced by the SNRP in the derivation of this design has been the modified orientation that allows many of the impacts to be significantly reduced. This SNRP design innovation was adopted by City of Melbourne management in the development of the third alternative design in the Council’s draft submission to the PAC.

The second significant SNRP innovation has been inclusion of on and off ramps at the CityLink connection, which means that the Elliott Ave interchange is not required, a significant environmental and economic advantage, which would mean that the total project cost is similar to the cost of the Reference Design.

Option 2 includes other features that address the negative aspects of the Reference Design:

  • No residents need to be displaced
  • Tunnels extend to Oak St and therefore Ross Straw Field can be restored after construction.
  • The wetlands can be restored after construction
  • Sound walls can be readily installed to contain the tunnel portal area
  • The height of the viaducts over the Tullamarine Freeway is much lower than in the Reference Design because they crossover further down the hill from the sound tunnel
  • The main ventilation stack would be located further away from residents, resulting in slight improvements to air quality for residents, and reducing the impact of a large feature being visible from local roads and parkland and adjoining suburbs. This would be complemented by a minor stack located about 100m east of Oak St behind the saved mature trees
  • The permanent visual impacts for residents are greatly reduced
  • The columns for the viaducts that cross City Link could mostly be located in the spaces between the main roadway that connects the Tullamarine Freeway to the sound tunnel and the on and off ramps located in this area. This would allow the beam spans to be minimised and thereby reduce construction costs
  • A connection could be made directly to/from the City Link sound tunnel in the first instance but also be connected to a viaduct on the western side of City Link if this was considered necessary for Part B. However, we note from the City of Melbourne submission that this duplication of City Link may not be required, which would be a fantastic outcome for Moonee Ponds Creek.
  • A southerly connection to a west side viaduct could be established by extending a viaduct over Mount Alexander Rd and then under the City Link sound tunnel, as shown above

Kensington Association

Kensington Association alternative for the Moonee Ponds Creek has the following advantages;

  • It is entirely within the project boundary and supports the intention of the Urban Design Framework.
  • The new parkland would be safe and welcoming, and enhance the Arden Macaulay Structure Plan.
  • The undercroft spaces of the alternative viaduct could be utilized as secure Vic Track storage area, or used for new rail yards. Also simplifying any future need to construct grade separation at Macaulay & Arden.
  • There will be greater room for the West Melbourne Terminal Station, which SP-Ausnet has made comment in its submission about the untimely risk the EWL project places on its refurbishment footprint.
  • New native parkland area could be created, ~4.2 ha, the first in years within inner Melbourne.
  • It would show a strong commitment from the project to history and the environment.
  • It would undo years of neglect in the Kensington area and be a positive news story for all parties.
  • The Capital City trail would be transformed.

Kensington Assoc alternative

 

Click here to view the other alternatives

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