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Subpart 56-9


56-9.1     Large asbestos projects
56-9.2     Small asbestos projects
56-9.3     Restricted entry

Historical Note:  Subpart (§§56-9.1 - 56-9.2) filed July 7, 1987 eff. July 28, 1987.

§ 56-9.1   Large asbestos projects.

     (a)   Enclosure - general.  Personal decontamination enclosure systems shall be provided outside and attached to all locations where persons will enter or exit the work area. One system at a single location for each contained work area shall be required. Such systems may consist of existing rooms outside of the work area, if the layout is appropriate, that can be enclosed in plastic sheeting and are accessible from the work area. When this situation does not exist, enclosure systems may be constructed out of metal, wood or plastic support.

     (b)   Rooms and configuration.  The personal decontamination enclosure system shall consist of a clean room, a shower room and an equipment room, in series, separated from each other and from the work area by airlocks. (See Figure 1.)


Image of Personal Decontamination Enclosure System

     (c)   Showers.  There shall be one shower per six full-shift abatement persons, calculated on the basis of the largest shift.

     (d)   Enclosure security.  When the personal decontamination enclosure system is situated near an area of public access, it shall be fully framed, sheathed for safety and constructed to prevent unauthorized entry.

     (e)   Plastic sheeting.  Personal decontamination enclosure systems constructed at the work site shall utilize at least six-mil opaque fire-retardant plastic sheeting. At least two layers of six- mil reinforced fire retardant plastic sheeting shall be used for the flooring of this area.

     (f)   Prefabricated or trailer units.  A fiberglass prefabricated unit does not require plasticizing. All prefabricated or trailer decontamination units shall be completely decontaminated and sealed prior to separation and removal from the work area.

     (g)   Clean room.  The clean room shall be sized to accommodate all authorized persons. Benches, lockers and hooks shall be provided for street clothes. Shelves for storing respirators shall also be provided. Clean clothing, replacement filters for respirators, towels and other necessary items shall be provided. The clean room shall not be used for the storage of tools, equipment or materials. It shall not be used for office space. A lockable door shall be provided to permit access to the clean room from outside the work area or enclosure. It shall be used to secure the work area and decontamination enclosure during off-shift hours.

     (h)   Shower room.  The shower room shall contain one or more showers. Each shower head shall be supplied with hot and cold water adjustable at the tap. The shower enclosure shall be constructed to ensure against leakage of any kind. Uncontaminated soap, shampoo and towels shall be available at all times. Shower water shall be drained, collected and filtered through a system with at least 5.0-micron particle size collection capability. A system containing a series of several filters with progressively smaller pore sizes shall be used to avoid rapid clogging of the filtration system by large particles. Filtered wastewater shall be discharged in accordance with applicable codes. Contaminated filters shall be disposed of as asbestos waste.

     (i)   Equipment room.  The equipment room shall be used for the storage of equipment and tools after decontamination using a HEPA-filtered vacuum and/or wet cleaning. A one-day supply of replacement filters, in sealed containers, for HEPA vacuums and negative pressure ventilation equipment, extra tools, containers of surfactant and other materials and equipment that may be required during the abatement project may also be stored here. A walk-off pan filled with water shall be located in the work area just outside the equipment room for persons to clean foot coverings when leaving the work area. A drum lined with a labeled, at least six-mil plastic, bag for collection of clothing shall be located in this room. Contaminated footwear and work clothes shall be stored in this area.

Historical Note:  Sec. filed July 7, 1987; amds. filed: Oct. 18, 1991; Oct. 25, 1994 eff. Nov. 9, 1994. Amended (f).

§ 56-9.2   Small asbestos projects.

     (a)   Enclosure requirements.  A personal decontamination enclosure system shall consist of, at the least, a shower room and a clean room separated from each other by an airlock and from the work area and other areas by curtained doors. All other provisions for large asbestos projects shall apply. Equipment storage, personal gross decontamination, and removal of clothing shall occur in the work area just prior to entering the shower. (See Figure 2 in section 56-10.1[d].)

Historical Note:  Sec. filed July 7, 1987; amd. filed Oct. 18, 1991 eff. Jan. 1, 1992.

§ 56-9.3   Restricted entry.

     Entry to the personal decontamination system shall be restricted to the following: contractor, employees of the contractor, authorized visitors, police, fire and other public safety personnel.


Note:   The full personal decontamination enclosure specified for large asbestos projects is recommended.

Historical Note:   Sec. filed Oct. 18, 1991 eff. Jan. 1, 1992.

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