Our experienced site personnel successfully installed services in deep cavernous limestone with a high water table. The client was pleased this was achieved to the highest quality necessary and without incident.

125m of the DN150 SN16 sewer reticulation was installed at a depth of 10m in cavernous limestone which required constant dewatering and meticulous planning. The excavations were multiple benched in accordance with ‘Code of Practice’ and management of excavated material for dust was completed to reduce disruption to surrounding residents. This ensured the safety of our personnel and resulted in no leaks or damage to the pipe.

A Class A finish had to be achieved to meet the approvals for this subdivision. The area was previously a market garden, with thicker than normal topsoil over loosely compacted and unstable limestone material. To get the required finish, we engaged a specialist compaction company to bring the site up to specification. Their HIEDYC compaction equipment provided a deep penetration compaction, saving considerable time and money by eliminating the need to remove unsuitable material and replace it with new, clean structural fill.

Residents in close proximity to the works were regularly consulted. Compaction techniques were altered where possible to avoid excessive vibration when working alongside their properties. Dust management was also a high priority to reduce the impact on residents.

Lake Coogee Stage 3 demonstrated that an existing site can be transformed to enrich the community. This can be achieved in a cost effective and timely way with good management and alternative construction techniques.