What should NOT be in direct contact with the structural supports of an LP-Gas container?

The correct answer is that soil should not be in direct contact with the structural supports of an LP-Gas container. This is important due to the potential for corrosion. When soil is in direct contact with the structural components of an LP-Gas container, it can hold moisture, which can lead to corrosion over time. Corrosion can compromise the integrity of the container and pose safety risks, including potential leaks or failures.

Other materials such as plastic, water, and steel have different implications. Plastic is generally used in protective applications and does not contribute to corrosion. Water alone may not pose an immediate risk; however, it’s usually managed to prevent accumulation around the container. Steel is commonly used in the construction of LP-Gas containers and is designed to provide structural support. Proper handling and installation practices are crucial to protect against potential hazards, but soil's ability to retain moisture and promote corrosion makes it the primary concern in this context.