RMS Post-Mitigation Testing 2

Question 1

How soon after a sub-slab depressurization system is installed should post-mitigation testing begin?

Accepted Answer

At least 24 hours after installation with the system running

Answer

EPA guidelines recommend waiting at least 24 hours after system activation before conducting post-mitigation testing to allow radon levels to stabilize.

Question 2

Which type of test device is considered the gold standard for post-mitigation confirmation testing?

Accepted Answer

Long-term alpha track detector (ATD)

Answer

Long-term alpha track detectors provide a 90-day or longer average, which is the most reliable measure of actual radon exposure after mitigation.

Question 3

A post-mitigation test result of 3.8 pCi/L is obtained. What is the recommended action?

Accepted Answer

Inform the client the system is working and suggest a follow-up test

Answer

A result just below 4.0 pCi/L is technically within EPA guidance but warrants informing the client and suggesting continued monitoring since it is close to the action level.

Question 4

During post-mitigation testing, closed-house conditions are required for at least how long prior to and during the test?

Accepted Answer

24 hours

Answer

EPA protocols require closed-house conditions for at least 12 hours prior to and throughout a short-term radon test, though 24 hours is the practical standard for post-mitigation tests.

Question 5

What does a post-mitigation diagnostic pressure field extension (PFE) measurement confirm?

Accepted Answer

That the sub-slab communication is adequate to depressurize the affected area

Answer

PFE measurements verify that the suction applied through the pipe extends sufficiently under the slab to capture radon-bearing soil gas.

(RMS) Radon Mitigation Specialist Practice Test

(RMS) Radon Mitigation Specialist Practice Test

RMS Post-Mitigation Testing 2