David Lees has been appointed as the Grouting Expert on the Panel of Experts for the Lesotho Highlands Water Project Phase II

Phase II of the project includes a 5.2m diameter, 32km long transfer tunnel to be excavated by drill and blast and TBM, the 165m high Polihali rock fill dam and 6.3km of tunnels of 11.5m diameter.

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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. 

Grouting and Foundation Works Australia has been awarded Best Ground Treatment Service Provider in NSW  in the Australian Enterprise Awards 2017

David Lees has registered to study his PhD at Peradeniya University in Sri Lanka. His research into "The effects of tunnelling on the near surface and deep level aquifer in the Uva Province" is directly related to his work as Chief Site Supervisor on the 15km headrace tunnel for the Uma Oya project

David was appointed by Amberg Engineering as Chief Site Supervisor for extensive grouting works and completion of the excavation of the 15.2km headrace tunnel excavated by TBM and a 3.7km drill and blast tunnel linking the two dams.