Southern region

Lawrence Hargrave Drive - northern amphitheatre embankment slip

Latest News - April 2013

RMS is continuing to carry out embankment protection work on Lawrence Hargrave Drive.

Work to increase the height of the catch ditch by around one metre is nearing completion. This lowers the risk of rocks falling onto the road. This work is expected to be finalised by the end of April 2013, weather permitting.

Minor traffic delays may be experienced on Lawrence Hargrave Drive during the work. Through access will be maintained and pedestrian access will not be disrupted. Work hours will be 7am until 6pm, Monday to Friday.

Work to concrete the base of the catch ditch on the western side of the road is complete. This has reduced the amount of water that can seep into the slip area and help to further increase embankment and road stability.

This work supplements the embankment protection work completed in 2012. For more detail on this work go to What is RMS doing to manage the embankment instability? page.

WHAT HAPPENS NEXT?

RMS is monitoring and will continue to review the impact of the current treatments on the stability of the slope.

This includes reviewing real time monitoring data and evaluating the movement within the embankment, and the water pressure level.

This information will help to guide the development of a plan for the continued management of the northern amphitheatre.

Once the current work is completed RMS plans to make some minor changes to improve safety for staff accessing the embankment slip area. This will include changes to the safety barrier and the formalisation of a staff parking bay.

FURTHER INFORMATION

Please contact Peter Hawkins, Project Manager on phone (02) 4221 2582 or email southernprojects@rta.nsw.gov.au.

Embankment slip animation

Concreting the base of the catch ditch Concreting the base of the catch ditch Concreting the base of the catch ditch Increasing the height of the catch ditch Increasing the height of the catch ditch Increasing the height of the catch ditch Increasing the height of the catch ditch The access track and erosion protection The access track and erosion protection Delivering material to the site Contractors Coastwide Civil beginning construction of the sea wall Contractors Coastwide Civil meeting with RMS staff on site Construction of the sea wall Construction of the sea wall - the 4-6 tonne basalt blocks used in the construction of the sea wall Construction of the sea wall Construction of the sea wall Construction of the sea wall Construction of the sea wall Construction of the sea wall Construction of the sea wall - site meeting between RMS and Coastwide Civil discussing the progress of the works Construction of the sea wall Construction of the sea wall - nearing completion Construction of the sea wall - placement of 4-6 tonne basalt boulders Construction of the sea wall - placement of 4-6 tonne basalt boulders Completion of works and site decommissioning Completion of works from southern rock platform Rain gauge Drilling wells to decrease water pressure in the embankment Catch ditch: The catch ditch on the western side of Lawrence Hargrave Drive. The catch ditch will be raised by around one metre New trench drain has been constructed to divert water away from the slip area. New trench drain has been constructed to divert water away from the slip area New concrete pit which connects into an existing culvert drain to divert water away from the slip area New concrete kerbing to divert water away from the slip area Three concrete pedestrian walkway slabs have been replaced at a steeper grade to divert water away from the slip area A new concrete pit has been constructed which connects into an existing culvert drain Lawrence Hargrave Drive slip area
Locality map Before slip cross section After slip cross section