Installation of 19,000ltr domestic septic tank. The area has a very high-water table so it was necessary to sheet pile and reinforce with horizontal RSJ beams welded into position so we could then excavate to the required depth.

The water needed to be pumped out daily from the excavation to be able to continue, and an underwater setting concrete was used for the base and the tank was lowered into position, strapped down and encased in concrete.