California ICC UST Inspector Practice Exam

For UST closures, soil samples must be taken from:

1. If UST is removed, beneath the removed portions of the tank, 2 ft into native soil at each end of the tank

2. If UST is removed, beneath the removed portions of the tank, from the midpoint, 1 ft into the native soil

3. If UST is not removed, beneath one side of the tank, 3 ft into the native soil

4. If UST is not removed, 2 ft into native soil at each end of the tank

The correct answer is: If UST is removed, beneath the removed portions of the tank, 2 ft into native soil at each end of the tank

The requirement for soil sampling during UST (Underground Storage Tank) closures is grounded in ensuring that any contamination from the tank or its contents is accurately assessed. When a UST is removed, there is an inherent risk of residual contaminants being present in the surrounding soil. To effectively evaluate this risk, soil samples must be taken directly beneath the locations where the tank was situated. The specified protocol requires that samples be gathered from beneath the removed portions of the tank, extending into the native soil. Taking samples from both ends of the tank and going down 2 feet ensures that a comprehensive assessment is conducted, as it allows for the detection of potential contaminants that may have leaked or migrated beyond the immediate area of the tank. This method provides a more thorough understanding of the soil quality and any necessary remediation steps that may be required for safety and environmental compliance. This procedural approach is designed to uphold environmental standards and protect public health by verifying the cleanliness of the site post-removal.