If water ballast is used for sinking a tank, what should the level of ballast not do?

When using water ballast to sink a tank, it is crucial that the level of the ballast does not exceed the level of water in the excavation hole. This is important because if the ballast surpasses the water level, it could create an imbalance that might cause the tank to float instead of sinking effectively. When the tank is submerged, it relies on the water outside to provide a counterbalance to the weight of the ballast. If too much ballast is added, it might push the tank up against the buoyancy forces, resulting in potential instability and improper installation.

Maintaining the right level of ballast in relation to the water level ensures that the tank remains submerged, allowing for proper settling and minimizing the risk of it being displaced during the sinking process. This careful balancing act is essential for the safe and effective installation of underground storage tanks, which must adhere to strict regulatory standards and best practices to prevent leaks and environmental contamination.