What is considered native soil in the context of an underground storage tank installation?

In the context of an underground storage tank installation, native soil refers to the natural, undisturbed soil that exists in the area prior to any excavation or construction activities. This definition aligns with the choice indicating soil outside of the excavated boundaries.

During the installation process, when a pit is dug for the tank, the soil that is originally found there is referred to as native soil. It serves as a baseline for assessing the condition of the surrounding environment and is significant in evaluating factors such as drainage, stability, and potential contamination risks.

Identifying native soil is crucial for ensuring regulatory compliance and understanding the environmental impact of the installation, making it an important concept for supervisors overseeing heating oil tank installations.