California UST System Operator Practice Test 2025 – Comprehensive All-in-One Exam Preparation Guide

A closure assessment in relation to Underground Storage Tank (UST) systems is fundamentally an evaluation performed to determine the environmental impacts when closing a UST system. This assessment is critical because it involves examining any potential contamination of the surrounding soil and groundwater that may have resulted from the operation of the UST.

When a UST is decommissioned, it's essential to ensure that any leakage or spillage that may have occurred during its operational life is identified and adequately addressed to safeguard public health and the environment. The closure assessment typically includes soil sampling, groundwater monitoring, and a review of the site’s historical use to assess the potential for adverse environmental impacts.

By focusing on the environmental consequences of a UST system’s closure, this assessment aligns with regulatory requirements designed to protect natural resources and public health. This ensures that the site can be safely reused or developed in the future without posing risks due to residual contamination from the UST system.