PARKES SHIRE COUNCIL
WESTERN GRAVITY SEWER

AUGMENTATION SYSTEM

Council is currently progressing the delivery of new sewer mains which is an extension of the new main from the Parkes SAP along with the existing reticulations main. The project involves the installation of approximately 1.74 km of new sewer pipeline west of Forbes Road, along Hartigan Avenue.

The delivery of Parkes Precinct is anticipated to result in a significant positive impact on the future growth in population and employment opportunities in the Parkes local government area (LGA). This population and employment growth will create additional demand for new and upgraded local infrastructure.

With this additional load from SAP and other resulting industries, the Parkes Sewerage Scheme infrastructure will have additional demand for it. This means the additional pumping station and sewer mains are required to pump raw sewage to the treatment plant. There is currently no wastewater infrastructure servicing the Parkes SAP.

This project will support future growth and sustainability with the Parkes area and allow for the provision of safe and reliable sewer reticulation system.

Description of Works.

The Parkes SAP development is an industrial area that is located on the outskirts of the western side of Parkes. The proposed gravity sewer main will run along the northern side of Hartigan Ave before crossing to the southern side of Hartigan Avenue and crossing under the active rail corridor. The gravity sewer main will continue east, crossing Forbes Rd until reaching the proposed connection point to a manhole located along Austral St

• Construction of gravity sewer main to provide a sewer service to industrial development (SAP)
• Approximately 1,220 meters of DN450 Sewer Max for sewer gravity main along the northern side of Hartigan Ave before crossing to the southern side of Hartigan Avenue
• Approximately 13 DN1500 concrete maintenance holes along the route (MH001-MH013)
• Trenchless crossing of Hartigan Avenue which is a state road. Between MH009 and MH010

Works Undertaken

• Mobilization and establishment of site in a major trafficable area.
• Traffic management daily alongside state road.
• Supply and install 710mm Steel Thrust bore under Hartigan Av (state road) to accommodate 450mm Sewer max and grout of annulus as per TfNSW road requirements.
• Excavate, sand bed and lay to grade 1.2km of 450mm Sewermax Gravity Sewer main.
• Excavate, shore, and install 13 x 1500mm Sewer Manholes varying in depth of 1.8m to 3.4m.
• Backfill and compact 1.2km of deep trench alongside main highway.
• Test and commission all manholes and pipeline as per technical specifications.
• High pressure jet all internal pipework and CCTV Camera as per technical specifications

Highlights, Innovations and Key Risks

• Project finished on budget even with council variations as they arose
• No major disruption to town water and sewer supply through the project duration
• Daily traffic and pedestrian management along all Streets to eliminate delays
• No major underground service strikes for the duration of the project
• Under boring of RMS Road and major Roundabouts
• Infield modifications to adapt to council requirements.
• Ongoing discussions with council to improve the sewer supply system.
• All subcontractors on the project were local to the region