What is the minimum clearance, in inches, required between trench walls and the piping?

The minimum clearance required between trench walls and the piping is 6 inches. This distance is crucial for several reasons. Firstly, it allows for proper protection and support for the piping, minimizing the risk of damage from shifting soil or trench walls. A clearance of 6 inches also facilitates the ease of installation and future maintenance, ensuring that there is enough room to work around the piping without the risk of interference from the trench walls. Additionally, maintaining this clearance helps mitigate hazards related to pressure buildup and potential leaks, which is vital for the safe operation of underground storage tanks. The establishment of this clearance standard is part of best practices to ensure both the functionality and safety of underground storage systems.