What determines the total depth of the tank excavation?

The total depth of the tank excavation is primarily influenced by several critical factors that ensure the tank is installed correctly and meets safety and regulatory standards. The correct option highlights the importance of tank diameter, bedding thickness, hold-down pad, depth of cover, and the slope and length of piping.

Tank diameter plays a significant role as it directly affects how much space is required for the tank to fit properly within the excavation. Adequate bedding thickness is essential to provide stable support for the tank, preventing shifting or settling over time. The hold-down pad is necessary for securing the tank in place, ensuring that it remains anchored during operational conditions and potentially during adverse weather events.

The depth of cover is crucial to protect the tank from external forces and environmental impacts, which can lead to damage if not properly accounted for. Lastly, the slope and length of the piping need to be considered to facilitate proper drainage and prevent complications associated with the flow of fluids, which could impact the overall setup.

In summary, this answer encompasses all the necessary aspects that contribute to determining the total excavation depth, ensuring that the installation adheres to safety regulations while maintaining functionality.