What is NOT a permissible material to use for filling a decommissioned tank?

When decommissioning a heating oil tank, specific materials are permissible for filling to ensure safety and compliance with environmental regulations. Soil is not an acceptable filling material because it can contain contaminants or may lead to compaction issues over time, which could potentially compromise the integrity of the tank and the surrounding area.

On the other hand, materials like perlite, gravel, and concrete are generally considered safe options. Perlite offers excellent lightweight properties and creates voids that can help with drainage and moisture management, while gravel provides structural support without excessive weight. Concrete is often used for its durability and stability, helping to secure the decommissioned tank effectively.

Using soil can introduce risks such as erosion or the leaching of pollutants, which is why it is not sanctioned for this purpose. Understanding the implications of each filling material is crucial for safely managing decommissioned tanks and ensuring environmental protection.