A contractor discovers underground storage tanks during excavation for a commercial project in Raleigh. Under NC environmental regulations, what is the required immediate action?
Correct Answer
C) Stop work and notify the NC Department of Environmental Quality within 24 hours
NC environmental regulations require immediate work stoppage and notification to NCDEQ within 24 hours when underground storage tanks are discovered during construction.
Why This Is the Correct Answer
Option C (stop work and notify the NC Department of Environmental Quality within 24 hours) is correct. NC environmental regulations require an immediate work stoppage and notification to NCDEQ within 24 hours of discovering underground storage tanks (USTs). USTs may contain petroleum or hazardous substances and must be assessed by qualified personnel under regulatory supervision.
Why the Other Options Are Wrong
Option A: Remove the tanks and dispose at nearest facility
Removing USTs without authorization is a serious regulatory violation. UST removal requires permits, certified contractors, and regulatory oversight. Self-removal without notification can spread contamination and expose the contractor to major liability.
Option B: Cover the tanks and complete the project
Covering the tanks and proceeding with construction would bury a known hazard, which is illegal under NC and federal environmental law. It also exposes the contractor to future liability when the tanks are eventually discovered.
Option D: Continue excavation and document the finding
Continuing excavation around or over USTs risks rupturing the tanks and releasing hazardous contents into the surrounding soil and groundwater. Documentation alone does not satisfy NC regulatory requirements.
Memory Technique
UST Discovery = Stop + Call NCDEQ in 24 hours. Think 'tanks need a 24-hour hotline call.' The 24-hour rule is specific to USTs — don't touch, move, or cover them. The clock starts the moment you find them. This parallels the contaminated soil rule but adds the explicit 24-hour deadline.
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