St Marys Wastewater System
Abergeldie was engaged by Sydney Water to design and construct upgrades and extensions to the wastewater reticulation network in St Marys, increasing capacity for the district's industrial and residential growth. The project spanned three local government areas: Penrith, Blacktown, and Fairfield City Councils. The new pump station now supports a community of 2,500 residents. This project was part of a series of works packages awarded to Abergeldie under Sydney Water’s five-year, $300 million Network Facilities Renewal Program, focusing on equipment replacement, refurbishments, and upgrades across the Cumberland Basin.
Scope of works
The works included the design, construction, testing, and commissioning of:
- A new sewage pumping station with an in-ground wet well, two fixed-speed submersible pumping units, an above-ground kiosk for electrical equipment, and an in-ground valve chamber with associated facilities.
- Emergency storage for the pump station to meet sewage system license requirements from the NSW EPA.
A 4.2km pressure main pipeline, comprising:
- 1.1km of HDD construction using DN200 PE100 PN 16 pipe from the new pumping station, following a straight alignment through Wianamatta Regional Park to an existing manhole on the Werrington Carrier.
- 2.8km of open trench pipeline construction.
- 300m of micro-tunnelling, including a pass beneath the M4 motorway, to extend the existing Ophir Street carrier pipeline with polypropylene pipe sizes ranging from DN375 to DN450, with a stiffness rating of SN10.
Environmentally conscious pipeline construction
Pipeline construction was carried out using a combination of open trench, micro-tunnelling, and HDD methodologies. Microtunneling and HDD were employed to avoid disturbing environmentally sensitive parkland, minimise disruption to existing structures and concurrent road construction by others, and maintain local road traffic flow.