The Lower South Creek Treatment Program covers upgrades to wastewater treatment facilities at Riverstone Wastewater Treatment Plant, St Marys Water Recycling Plant, and Quakers Hill Water Recycling Plant.
Sydney Water identified the need to deliver significant improvements to the water quality, treatment plant capacity, and reliability of the wastewater system in the Lower South Creek region. Upgrades to the treatment plant included a plan that catered for future population growth, supporting a possible extra 500,000 people in the area by 2040.
Ferrycarrig has been engaged by Sydney Water to complete roads and drainage construction works package at the newly upgraded treatment water treatment plants at Quakers Hill and Riverstone. This includes installation of stormwater, preparing areas for new roads, and various aspects of concrete works around the treatment plants.
Due to the potential environmental impacts of contaminated rain runoff as a result of a malfunction in any given plant into adjacent waterways, the stormwater network was upgraded to increase its capacity and for recycling back into the sewer network as a redundancy. This was achieved by first upgrading the network with additional stormwater lines and pits and further upsizing existing pipes and lintels.
A First flush system was installed at the lowest part of the network before being released into the adjacent waterways. The purpose of this tank was to identify and capture any contaminants and subsequently redirect the flow into the adjacent sewer network so the water could be treated by the plant. This ensured that the plant only released recycled, treated, and safe quality recycled water.
With the construction of new treatment elements, the footprint of each plant doubled in its size. To access the new structures for operations and maintenance, Ferrycarrig constructed new flexible road pavements throughout the plant. This included the detailed excavation and pavement construction including kerbing and asphalt pavement elements.
All works had to be coordinated with the Sydney Water Plants to ensure full operations could be maintained during the construction phase. To mitigate impacts to operations, Ferrycarrig worked closely with the Sydney water team to ensure daily traffic movements were well-coordinated between all parties’ deliveries.
Special consideration was given to the Sydney Water chemical deliveries where temporary pavements had to be constructed and removed regularly to ensure operations and access to designated points.
Works were completed on time, on budget and in line with project stakeholder expecations.