MRS Health and Safety Considerations in Mold Remediation 3 — Questions and Answers
Question 1: Which type of respirator provides the highest level of respiratory protection during mold remediation involving Stachybotrys chartarum?
- N95 disposable filtering facepiece
- Half-face air-purifying respirator with P100 filters
- Full-face air-purifying respirator with P100 filters
- Powered air-purifying respirator (PAPR) with HEPA filters (Correct answer)
Correct answer: Powered air-purifying respirator (PAPR) with HEPA filters
A PAPR with HEPA filters provides the highest assigned protection factor (APF 25–1000) and is recommended for highly toxic mold species like Stachybotrys.
Question 2: Eye and mucous membrane irritation experienced immediately upon entering a mold-contaminated space is most likely caused by:
- Mycotoxin vapor absorption
- Volatile organic compounds (MVOCs) produced by mold metabolism (Correct answer)
- Spore mechanical irritation only
- Carbon dioxide buildup in the enclosed space
Correct answer: Volatile organic compounds (MVOCs) produced by mold metabolism
Mold volatile organic compounds (MVOCs) are gases produced during active mold growth that cause immediate sensory irritation to eyes and mucous membranes.
Question 3: Under IICRC S520 guidelines, what is the minimum safe distance that unprotected building occupants must maintain from a Level II remediation area?
- The adjacent room must be vacated (Correct answer)
- The entire floor must be cleared
- The entire building must be evacuated
- Only the remediation room needs to be cleared
Correct answer: The adjacent room must be vacated
For Level II remediation (10–100 sq ft), the adjacent space must be vacated and containment established, but full building evacuation is not required.
Question 4: Mold remediation workers should shower and change clothes before leaving the job site primarily to prevent:
- Violating OSHA confined space regulations
- Secondary contamination of homes, vehicles, and family members (Correct answer)
- Damaging PPE through improper storage
- Cross-contamination between job sites on the same day
Correct answer: Secondary contamination of homes, vehicles, and family members
Showering and changing before departure prevents take-home contamination, protecting workers' families from mold spore exposure.
Question 5: A worker reports experiencing persistent coughing and wheezing weeks after completing a mold remediation job. The employer's first obligation is to:
- Document the complaint and conduct annual review
- Refer the worker to a physician for a medical evaluation (Correct answer)
- Provide a higher-grade respirator for future jobs
- Require the worker to sign a waiver before returning to work
Correct answer: Refer the worker to a physician for a medical evaluation
OSHA's respiratory protection standard (1910.134) requires that symptomatic workers be referred to a physician before continuing respirator use or exposure.
Question 6: What is the correct disposal method for PPE and debris from a mold remediation project?
- Double-bag in 6-mil polyethylene bags, seal, and label before disposal (Correct answer)
- Place in standard construction waste dumpsters without sealing
- Incinerate on-site to prevent spore spread
- Bag in 1-mil bags and transport to a certified biohazard facility
Correct answer: Double-bag in 6-mil polyethylene bags, seal, and label before disposal
Mold-contaminated materials must be double-bagged in 6-mil poly bags, sealed with tape, and labeled before being transported as general waste.
Question 7: Which mold genus is most associated with causing invasive infections in immunocompromised individuals and warrants the highest worker caution?
- Cladosporium
- Penicillium
- Aspergillus (Correct answer)
- Alternaria
Correct answer: Aspergillus
Aspergillus species, particularly A. fumigatus, can cause invasive aspergillosis in immunocompromised individuals and require strict PPE controls.
MRS Health and Safety Considerations in Mold Remediation 3
Which type of respirator provides the highest level of respiratory protection during mold remediation involving Stachybotrys chartarum?