DOHMH guidelines on fungi assessment and remediation, Apr 2000

NYC 9/11 Public Portal Document

(d) The work area should be covered with a plastic sheet(s) and sealed with tape before remediation, to contain dust/debris. (e) Dust suppression methods, such as misting (not soaking) surfaces prior to remediation, are recommended. (f) Growth supporting materials that are contaminated, such as the prp^ on the insulation of interior lined ducts and filters, should be removed. Other contaminated materials that cannot be cleaned should be removed in sealed plastic bags. There are no special requirements for the disposal of moldy materials. (g) The work area and areas immediately surrounding the work area should be HEPA vacuumed and cleaned with a damp cloth and/or mop and a detergent solution. (h) All areas should be left dry and visibly free from contamination and debris.

(i) A variety of biocides are recommended by HVAC manufacturers for use with HVAC components, such as, cooling coils and condensation pans. HVAC manufacUners should be consulted for the products they rec d for use in their systons.

332 Areas of Contamination (>10 square feet) in the HVAC System

A health and safety professional with experience performing microbial investigations should be consulted prior to remediation activities to provide oversight for remediation projects involving more than a small isolated area in an HVAC system. The following procedures are recommended: (a) Personnel trained in the handling of hazardous materials equipped with: i. Respiratory protection (e.g., N95 disposable respirator), in accordance with the OSHA respiratory protection standaM (29 CFR 1910.134), is recommended. ii. Gloves and eye protection iii. Full-face respirators with HEPA cartridges and disposable protective clothing covering both head and shoes should be worn if contamination is greater than 30 square feet (b) The HVAC sjstem should be shut down prior to any remedial activities. (c) Containment of the affected area: i. Complete isolation ofwork area from the other areas of the HVAC system using plastic sheeting sealed with duct tape. ii. The use of an exhaust fan with a HEPA filter to generate negative pressurization. iii. Airlocks and decontamination room if ccThEahnT ination is greater than 30 square feet. (d) Growth supporting materials that are contaminated, such as the paper on the insulation of

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