Level IV
Extensive Contamination (greater than 100 contiguous sq. ft in an area).
- Personnel trained in handling of hazardous materials and equipped with:
- Full face respirators with HEPA cartridges
- Disposable protective clothing covering the entire body including the head, shoes and hands
- Containment of the affected area:
- Complete isolation of the work area from occupied spaces using plastic sheeting sealed with duct tape ( including ventilation duct/grills, fixtures, and other openings
- The use of an exhaust fan with a HEPA filter to generate negative pressurization, a decontamination room, and airlocks
- Contaminated materials that cannot be cleaned should be removed from the building in sealed impermeable plastic bags and disposed of as ordinary waste.
- The contained area and decontamination room should be HEPA vacuumed and cleaned with a damp cloth or mopped with a detergent solution and be visibly clean prior to the removal of any isolation barrier.
In conclusion, after the moisture source has been eliminated and the mold growth removed, the premises should be revisited and then re-evaluated to ensure the mold growth and the remediation process was successful. The premises should be free of any moldy smells or visible growth.
Read more about this topic: Mold Growth, Assessment, And Remediation, Protection Levels
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