TDG was engaged for assessment and rectification of 4.5 kilometers of Stormwater conduit and maintenance holes, utilising CCTV inspections or physical traversing methods, followed by necessary rectification works.
TDG was engaged to pressure clean and record data from pressure drains at the base of the Dam wall and spillway. The drains provide important pressure release role in operation of the dam to mitigate destabilising pressure in the structure.
This project aimed to assess silt levels within a 2.4km, 1200mm ocean outfall from the primary wastewater treatment plant to the ocean discharge using a sonar-equipped, neutrally buoyant sub from the MSI toolkit. A specially trained 5-person crew traveled from Auckland to Timaru over two days for the inspection, as the outfall, initially inspected in 2013, showed a significant silt buildup resulting in a 25% reduction in diameter. Reengaged after 10 years, TDG was tasked to conduct a follow-up inspection to assess the effectiveness of the Council’s cleaning program required by the discharge consent.
TDG delivered a comprehensive and organised solution to fulfill the client’s specified works scope, involving coordination with various contractors such as locators, traffic management, and surveyors, while navigating through multiple jurisdictions and permits including those from local government, Department of Transport, and resident notifications.
The client engaged TDG to carry out smoke testing as a proactive measure to identify and address leaks and defects in sewer systems. The local pump station for council has recorded more water going through then what is scheduled capacity. Through the implementation of smoke testing, TDG successfully pinpointed areas of concern within their sewer infrastructure, leading to targeted repairs, improved system integrity, and enhanced environmental protection.
The client engaged TDG to conduct an investigation into a pipeline connected to a drainage tank for a Community Centre, which experienced surcharge and flooding during heavy rainfall. Through CCTV investigation, we identified the pipeline obstruction caused by large tap roots and masses. Subsequently, TDG was tasked with restoring the pipeline to its full structural integrity and serviceability.
The project in Wellington involved TDG Environmental using Multi-Sensor Inspections (MSI) to profile interceptor corrosion, resulting in the discovery of rapid degradation, demonstrated through a comparison report spanning 2013 to 2020, highlighting the need for ongoing inspections and leading to client satisfaction and pipeline relining.
TDG was tasked by the client to conduct comprehensive data collection within the project’s catchment area to evaluate network conditions and renewal needs. This involved employing various techniques, including CCTV inspections, laser profiling, and GPS surveying.
The successful removal of a submerged car from creek in Sydney NSW, conducted by experienced contractors via crane while ensuring minimal environmental impact and implementing traffic control for public safety, resulted in a safely accessible site following completion of fencing repairs and car removal.
TDG provided liquid waste removal services for the 2023 Airshow, managing the largest attendance in the event’s history; approx 20,000 per day during the trade days and 80,000 people per day during the general public days. With 8 vehicles strategically stationed on site, we removed over 710,000 litres of liquid waste throughout the event.
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Australia 1300 330 294
AU 1300 330 294 
info@tdg.com.au 
