RMS Quality & Compliance Flashcards

Which type of fan failure would most directly cause a radon mitigation system to stop functioning while still appearing operational?

Answer: A fan with a seized motor producing no airflow

A seized motor produces no airflow despite any residual noise or indicator light, making the system appear operational while it fails.

When performing quality control on a sub-slab depressurization system, which measurement confirms adequate negative pressure beneath the slab?

Answer: Differential pressure between sub-slab and interior air

A negative differential pressure reading (sub-slab lower than interior) confirms the system is creating the intended suction.

According to EPA standards, where must a sub-slab depressurization system exhaust its air?

Answer: Outside the building above the eave line

EPA requires exhaust discharge above the eave line and away from windows, doors, and air intakes to prevent re-entry.

A homeowner reports that the U-tube manometer installed on their radon system shows equal fluid levels on both sides. What does this indicate?

Answer: No pressure differential exists, suggesting the fan may not be operating

Equal fluid levels in a U-tube manometer indicate no pressure difference, which means the fan is likely not creating sub-slab suction.

What is the minimum number of post-mitigation radon tests required before issuing a compliance certificate under most state programs?

Answer: One short-term or long-term test

Most programs require at least one post-mitigation test to verify the system has reduced radon below the action level.

Which record must an RMS retain for a minimum period specified by their certifying body after completing a mitigation project?

Answer: Installation records, test results, and system diagrams

Certification bodies require retention of full installation records including test data and system diagrams for quality assurance and dispute resolution.

A crawlspace depressurization system shows radon levels dropping from 18 pCi/L to 5 pCi/L post-installation. What is the correct classification of this outcome?

Answer: Partially successful — level still above EPA action level

At 5 pCi/L, the level remains above the 4 pCi/L EPA action level, so the system requires optimization despite significant reduction.