What does the term 'Native Soil' refer to in the context of underground storage tanks?

The term 'Native Soil' in the context of underground storage tanks refers to the soil that is found outside the immediate boundaries of an excavated pit for a tank. This definition is significant because it emphasizes the natural, undisturbed soil that is present in the environment before any excavation or installation takes place. Understanding native soil is crucial in assessing potential contamination risks and the behavior of contaminants, as it serves as a baseline for evaluating any changes resulting from the tank's presence or from leakage.

Additionally, knowing the characteristics of native soil helps in planning appropriate measures for environmental protection and remediation, as it is essential in determining how contaminants might spread or be treated once released into the surrounding environment. Identifying the native soil correctly is a key factor in risk assessment and management strategies surrounding underground storage tanks.