SERVICES

WASTEWATER SERVICES

SEWAGE STORAGE

Ledonne Constructions Pty Ltd has extensive experience and a thorough knowledge of the construction of sewage storage processes, most commonly known as Pumping Stations. Almost all of the sewer-related works that we have completed involve construction of a sewer pumping station, both of the precast and cast-in-situ varieties. Traditionally, pumping stations were split into “dry well” and “wet well” sections, where pumps would be placed in the dry well section to avoid damage by contact with the effluent. Over time, pump technology evolved, and with the introduction of submersible pumps, the partitioning of the well was no longer necessary, increasing performance.

Our most notable construction project of this type was the now fully operational 11.3 metre diameter, 12.4 metre deep, Sewer Pumping Station located on Morriset St, Queanbeyan NSW. Along with the construction of the well itself, the project included the construction of a biofilter, deodorisation bed, switchroom, and the demolition of the previous sewer pumping station.

SEWAGE TRANSPORTATION

CONVENTIONAL SYSTEMS

The most basic and conventional way to transport water through pipes is by gravity. The downside being that the pipe must always be at a sufficient downhill grade to achieve flow by gravity forces. Since the use of gravity systems, pressure (and to a lesser extent, vacuum) systems have been designed to transport sewer over any topography, and Ledonne Constructions Pty Ltd has highly trained personnel, and has acquired vast experience in the installation of both types of systems.

One of the more notable projects involving the installation of gravity and or pressure/rising mains was our project in the Grafton/Maclean region of Northern NSW. It involves over $20 million dollars of work, comprising of 6 pumping stations and over 30 kilometres of sewer and water pipeline, with works anticipated to be finished 3 months ahead of schedule.

MODERN SYSTEMS

Ledonne Constructions Pty Ltd have always believed in bringing the most innovative wastewater and water infrastructure to potential clients, and this is no less reflected in our involvement with Low Pressure Sewer Systems (LPSS). A product developed by E-One in the United States, the product was actively researched and pursued by the Managing Director of Ledonne Constructions PTY Ltd, Tony Ledonne, as he saw a niche in the market for this type of sewerage system. In the late 1990’s and early 2000’s, Mr. Ledonne, in collaboration with a design consultant, tried in vain to market the product to potential investors, but it was to no avail, as clients were not willing to take the gamble on a largely untested product in Australia.

Persistent with the knowledge of the numerous benefits of the LPSS, in 2005 Mr. Ledonne lodged an alternative bid for the Tingha Sewerage Scheme (managed by the NSW Public Works, formerly known as the Department of Commerce). The original tender designed for a combination of gravity and rising mains, but the significant cost reductions of the LPSS incurred with only shallow trenches required, coupled with the expenses foregone due to the majority of strata being hard rock, resulted in the tender being awarded for this innovative system.

Due to the success of the project, a further two LPSS projects were awarded to Ledonne Constructions from the Shoalhaven Branch of the NSW Public Works, and in 3 years, we had completed $11.3 million dollars worth of LPSS work alone, gaining a wealth of experience and proving the viability of the product in rural areas where the grade of the terrain is shallow, and there is an abundance of hard rock strata. Inevitably, the LPSS market has become quite competitive, but our pioneering role in its implementation in NSW coupled with our years of experience bodes well for the future.

Over the past 5 years, Ledonne Constructions Pty Ltd have developed a strong and close working relationship with design consultant Pressure Sewer Solutions Pty Ltd. Through this collaboration, Ledonne Constructions Pty Ltd was able to successfully design and construct the works undertaken in both Tingha and along the South Coast of NSW.

For a more detailed look at the processes involved in the Low Pressure Sewer System, please click on Shoalhaven City Council’s information brochure here. All photos in this publication are the property of Ledonne Constructions Pty Ltd.

Another technology that stemmed from the construction of the LPSS is trenchless technology by use of Polyethylene Pipes. This technology has allowed for the ease of trenching underneath suburban roads with minimal traffic delay or restoration costs incurred. Ledonne Constructions Pty Ltd have quite competent operators and subcontracts well versed in this type of technology, which is fast becoming the viable option when working near densely populated townships.

SEWAGE TREATMENT

Ledonne Constructions Pty Ltd has also completed construction and modifications to Sewer Treatment Plants (STP) in NSW. While STP construction is not the forte of the company, we have recently worked in conjunction with STP contractors in both Goulburn and Grafton to supply wastewater to the facilities. Ledonne Constructions Pty Ltd recognizes that a more involved understanding and experience base in STP construction is a direction to be taken in the future.

WATER SERVICES

WATER STORAGE AND TRANSPORTATION

The decades of experience of construction in sewer pumping stations and sewer gravity and rising mains has also been reflected across raw water and grey water schemes, with notable projects including the construction of the Water Pumping Station in Morriset, NSW and Raw Water Pumping Station for the Upper Cascade Dam.

ADDITIONAL SERVICES

Ledonne Constructions also provides the following services;

  • Stormwater Drainage
  • General Earthworks
  • Tunnelling
  • Pipe-Jacking
  • Thrust-boring
  • Plant Hire