How far away from the edge of the tank excavation should stockpiled materials be placed?

Stockpiled materials should be placed at least 2 feet away from the edge of the tank excavation to ensure safety and stability. This distance helps prevent potential cave-ins or collapses of the excavation site as the weight of the materials could exert pressure on the excavation walls. Maintaining this distance allows for adequate access to the excavation area for workers and equipment, reducing the risk of accidents and improving overall site safety. Furthermore, a 2-foot separation aligns with best practices and regulatory guidelines, which emphasize the importance of proper material management during UST installations and retrofits to maintain a safe and compliant work environment.