Potato Point Sewerage Scheme
Project: Provide a reticulated pressure sewerage scheme to service 164 lots in Potato Point.
Funding: A $3.22 million grant from the NSW State Government
Start: Financial Year 2017-18
Expected completion: Late 2020
- mid 2019 - construction of the new sewage pumping station to begin
- mid-late 2019 - construction of the pressure sewerage systems to begin
- mid-late 2020 - scheme operational.
The Potato Point Sewerage Scheme involves the installation of a reticulated pressure sewerage system throughout the village and construction of a sewage pumping station and rising main. The new system will replace the existing on-site sewage management systems, significantly reducing the risk of harm to the environment and public health.
The pressure sewerage system requires a small pump unit to be installed at each dwelling. This unit will collect and pump the sewage into the street mains. The new pump station will transfer sewage 6.7km along a new rising main to the Bodalla Sewage Treatment Plant.
The treatment plant has been designed to service Potato Point as well as Bodalla. To minimise environmental impacts of the new scheme, effluent disposal will be via irrigation of surrounding agricultural land. Discharge to Borang Creek will only occur during extended wet periods.
The project has been identified in Council’s long term water and sewer strategic plan, the Integrated Water Cycle Management Strategy.
While the construction works are underway, Council will take the opportunity to renew all reticulated water mains within the village. The renewed water mains will ensure greater reliability of the supply for the community. Council will also install a new trunk water main in the same easement as the new sewage rising main adjacent to Potato Point Road. These works will minimise future disruption to residents and visitors.
Sewage Pumping Station
A Preliminary Environmental and Planning Overview was completed assessing various sites for the location of a Sewage Pumping Station (SPS) and rising main. A proposed concept design was then developed.
Four locations were considered for the SPS and the area adjacent to the Rural Fire Service shed was selected because:
- impact on amenity is minimised for residents and visitors
- reduced space to minimise impact on existing uses of the fire shed and surrounding area
- vegetation clearing not required.
The SPS will include a 100kL concrete tank (3m tall x 7m diameter) and a single storey brick building (approximately 90m 2). All equipment, including pumps and electrical equipment, will be housed within this building. Odours from the SPS will be minimised through the use of an odour control system.
View plans of the Sewage Pumping Station
Pressure sewerage system
In comparison to traditional gravity fed systems, pressure sewerage schemes have lower construction costs and reduced environmental and social impacts during construction. The pipes are installed shallower and are smaller in diameter. Pipes can be installed using horizontal drilling technology, avoiding deep excavations throughout the village.
Each property will have a small underground pump unit (plastic tank) and associated electrical control panel within their property boundary to collect sewage and transport it to the new pumping station.
The pump unit to be installed on each property is approximately 1m in diameter and 2m deep, and will be owned and operated by Council. The pump is triggered by the water level within the pump unit. If the level becomes too high (due to pump failure or excessive flows) an alarm will activate. The property owner can call our on-call sewer operators anytime to attend to the problem. The units have 600 litres (approximately 24 hours) of storage above the alarm trigger level providing ample time for our staff to undertake the required works.
The following works will be carried out with no cost to property owners who have an existing on-site sewage management system:
- installation of pump unit, pump, pump control panel, boundary kit and discharge pipe
- plumbing to connect each existing house to the pump unit
- electrical connection to the pump and any electrical capacity upgrades required (provided the existing electrical works comply with current standards).
The following works will be at the expense of the property owner:
- decommissioning of existing on-site sewage management systems
- rectification of any existing plumbing that doesn’t conform to current standards
- rectification of relevant existing electrical works that do not conform to current standards.
Once connection is complete the following costs will be ongoing:
- the standard annual sewerage charge, currently $950 annually for residential properties
- electrical running costs for the pump, estimated at approximately $30 per year.
Vacant lots (and houses under construction without an on-site sewage management system) will only have a connection point (boundary kit) installed.
Future development applicants (for new dwellings) will need to liaise with our Water & Sewer Division regarding the location of new pressure sewerage assets. In line with our standard procedures (and as a cost of developing the lot) a standard fee, currently $11,000, will be charged for the installation.
- The tender package for the sewage pumping station, sewer rising main and water supply trunk main is almost complete and will soon be advertised.
- The design for the pressure sewerage scheme is 95 per cent complete.
- Our water crew has been busy renewing the water mains in areas around the village.
- Designs are progressing for the pressure sewer street mains and property plans.
- Our engineers have been working on the detailed design of the village water mains upgrade.
- A crew will begin the upgrade works in May and continue through to December.
- Individual households will be notified if water supply will be interrupted or if property access will be affected.
- To minimise future disruption to the community, we will upgrade the Potato Point water infrastructure prior to construction of the sewerage scheme. The work involves replacing of 3.3km of water mains, stop valves, hydrants and service connections throughout the village as well as a trunk main from Bodalla to Potato Point. Once the new water and sewer infrastructure is in place it will provide a trouble-free service for many decades to come.
- Data collected from recent survey work has assisted designers to develop accurate pressure sewer plans ensuring that all new sewer components are located within the property boundaries.
- A separate tender will be advertised for the construction of the pressure sewer reticulation system within the village.
- Property owners will soon receive the results from their property electrical service audit. If works are required, property owners will need to engage a licensed electrician to rectify any faults identified.
- Council has added trunk water main works to the design and tender process for the Sewage Pump Station and rising main.
- Public Works Advisory is managing the design and tender processes for the construction of the pump station and rising main. We expect the tender process to begin soon.
- Landmark Surveys are finishing up locating services throughout the village.
- Landmark Surveys are progressing with the cadastral and engineering surveys which will be completed in February.
- PS Solutions have consulted with most property owners and are now finalising property designs.
November & December 2018
- PS Solutions have been working closely with property owners to determine the location of pressure sewer infrastructure to be installed on individual properties.
- Landmark Surveys have been engaged to undertake cadastral and engineering surveys throughout the village between November 2018 and February 2019.
- The survey data is required to ensure that accurate plans can be developed to ensure all new pressure sewer components will be located within the property boundaries.
- The design process is in the closing stages for the new Sewage Pumping Station to be built adjacent to the RFS shed.
- Pressure System Solutions Pty Ltd (PS Solutions) have been meeting with owners on properties to create individual plans for the new pressure sewerage system.
- An information session at the local RFS shed on 8 October provided the opportunity for the community to have a chat with Council and contractors and see the sewerage components to be installed.
- The Bodalla Sewerage Treatment Plant has become operational and is receiving flows as properties in Bodalla undergo their final connections. The treatment plant will also service Potato Point when the pressure sewerage system is installed in the village.
- Property owners are notified that PS Solutions will engage with each landowner to discuss individual needs regarding installation of new components on private properties.
- Construction of the Bodalla Sewage Treatment Plant (STP), which will take sewage flows from Potato Point, is nearing completion, with commissioning of the plant to begin this month.
For more information about the Potato Point Sewerage Scheme, please contact our Water & Sewer Cadet Civil Engineer, Billy Alves:
- T: 02 4474 1000
- E: Council