McMahon Services were engaged by Sarin Property Group to undertake this extensive residential subdivision project as part of the Lincoln Cove Marina expansion in Port Lincoln, South Australia.
The project was split into two stages, a lakeside residential area named “Parnkalla Waters” and a larger residential area named “South Lakes” situated on deep-water canals with frontage for private pontoons.
McMahon Services self-delivered Stage One – Parnkalla Waters to transform the low lying swamp into a 34 waterfront allotment marina subdivision complete with essential infrastructure, asphalt roads, concrete footpaths, limestone block retaining walls with steps down to the new constructed sand beach and water reserve.
This unique project incorporated all forms of site preparation works. Over 150,000m3 of bulk earthworks was required to construct the man made beach which also included the construction of 900 lineal metres of 1m high architecturally designed retaining wall and placement of 8,000 tonne of beach sand.
In excess of 6,000 tonne of 300mm rock revetment was placed, and 34 residential building plots were prepared.
The project team also constructed all sewer, water and common services infrastructure required for the subdivision, which included two transformers, lighting poles and NBN pits. Additionally, over 380 lineal metres of stormwater pipe ranging from 375mm to 1200mm and a 22 metres long triple cell culvert was also installed as part of the detailed civil works.
Roadworks for the project included sub-base course and asphalt placement, over 1.25km of kerbing and the installation of nearly 200 metres of guard rail.
The specific geographical location of the project posed some significant challenges for our team. This included working in and around ground water and tidal flows from the neighbouring marina. This was particularly evident with the installation of deep services for the sewerage infrastructure.
To overcome this, two six inch pumps were utilised operating 24 hours a day for over four months. Additionally, a series of wells were excavated to enable water to be pumped away from the work zones. This method was extremely effective, and meant we did not need to drive heavy earthmoving equipment into the marina to undertake the installation of the infrastructure.
Innovative techniques when pouring the triple cell culvert were utilised. The team were able to specially design the head walls in precast concrete so they could be lifted directly into place, instead of pouring the head walls insitu. Each head wall weighed over 10 tonne and was installed in two hours as opposed to in excess of one week each for form and pour if we were to have used the conventional method.
During the construction of the project a number of significant sewer changes were required, which included the addition of a pump station in St Andrews Drive. This also included the decommissioning and conversion of an existing pump station, along with a connection into the existing pumping main. In order to assist our client with the total delivery of the project, McMahon Services offered to undertake all of the electrical service and NBN works including all coordination and liaison with SA Power Networks for connections.
Strong communication with residents and the collaborative approach between the client and McMahon Services was imperative to the successful delivery of the project.
In addition, 90% of our work force were employed from the local community, and multiple small businesses in the region were engaged to deliver services for the project.
