CMA Post-Remediation Verification & Clearance Testing 1 — Questions and Answers
Question 1: What is the primary purpose of post-remediation verification (PRV)?
- To document the cost of remediation work
- To confirm that remediation was successful and the area is safe for reoccupancy (Correct answer)
- To identify the source of moisture intrusion
- To determine the species of mold present before remediation
Correct answer: To confirm that remediation was successful and the area is safe for reoccupancy
Post-remediation verification confirms that mold has been adequately removed and conditions are safe for building occupants to return.
Question 2: Which organization's guidelines are most commonly referenced for post-remediation clearance criteria in the United States?
- OSHA (Occupational Safety and Health Administration)
- IICRC S520 Standard and Reference Guide for Professional Mold Remediation (Correct answer)
- EPA National Ambient Air Quality Standards
- NIOSH Manual of Analytical Methods
Correct answer: IICRC S520 Standard and Reference Guide for Professional Mold Remediation
The IICRC S520 is the primary industry standard guiding professional mold remediation and post-remediation verification criteria in the US.
Question 3: When should post-remediation verification air sampling be conducted relative to remediation activities?
- During active remediation to monitor progress
- Before remediation begins to establish a baseline
- After the work area has been cleaned and containment is still in place but before it is removed (Correct answer)
- Only after containment has been completely dismantled and the area has aired out
Correct answer: After the work area has been cleaned and containment is still in place but before it is removed
PRV sampling should be conducted after cleaning is complete but while containment remains intact to ensure the remediated area meets clearance criteria before the barrier is removed.
Question 4: What is the standard outdoor control (background) sample used for during post-remediation clearance testing?
- To measure humidity levels outside the building
- To provide a baseline comparison for indoor air sample results (Correct answer)
- To document the type of mold found in the surrounding environment
- To calibrate the air sampling pump before indoor sampling
Correct answer: To provide a baseline comparison for indoor air sample results
An outdoor control sample establishes a baseline of naturally occurring spore levels so indoor results can be compared to determine if indoor levels are elevated above outdoor conditions.
Question 5: Which of the following visual criteria must be met before air sampling during post-remediation verification?
- Walls must be repainted to cover any staining
- No visible mold growth, dust, or debris should be present in the remediated area (Correct answer)
- Replacement building materials must be fully installed
- HVAC filters must be replaced within 24 hours of the inspection
Correct answer: No visible mold growth, dust, or debris should be present in the remediated area
Visual clearance requires the remediated area to be free of visible mold, settled dust, and debris before air sampling is conducted to avoid skewed results.
Question 6: Who is generally qualified to perform post-remediation verification in states with mold assessor licensing requirements?
- The remediation contractor who performed the work
- A licensed mold assessor who is independent of the remediation contractor (Correct answer)
- Any certified industrial hygienist regardless of mold-specific training
- The building owner or their designated representative
Correct answer: A licensed mold assessor who is independent of the remediation contractor
Most states require PRV to be performed by a licensed mold assessor who is independent of the remediation contractor to prevent conflicts of interest.
Question 7: What type of air sampling media is most commonly used for post-remediation clearance testing?
- Bulk material samples collected from surfaces
- Spore trap cassettes (e.g., Air-O-Cell, Zefon Bio-Pump Plus) (Correct answer)
- Wipe samples collected with sterile swabs
- Passive settling plates left open for 24 hours
Correct answer: Spore trap cassettes (e.g., Air-O-Cell, Zefon Bio-Pump Plus)
Spore trap cassettes capture airborne particles and are the most widely used method for PRV clearance air sampling because they provide quick, quantitative results.
CMA Post-Remediation Verification & Clearance Testing 1
What is the primary purpose of post-remediation verification (PRV)?