David has been appointed to supervise a crew from Mainmark Civil at Arncliffe to carry out post grouting of the tunnels. The role required defining the scope of works, designing the extent of the grouting and completing the task to achieve an acceptanle water ingress of 6 l/min/100m.
The New M5 is twin motorway tunnels in Sydney 9km long, from Kingsgrove to St Peters, and are part of the West Connex project. The tunnels at Arncliffe are 17m wide and 8m high, and 30m below surface, and pass under the Cooks River.