MO Asbestos Abatement cheat sheet

Missouri asbestos rules are administered by the Missouri Department of Natural Resources (MoDNR) Air Pollution Control Program under 10 CSR 10-6.250; the federal NESHAP (40 CFR Part 61, Subpart M) also applies, and the stricter requirement governs.

Regulated asbestos-containing material (RACM) under NESHAP is material with more than 1% asbestos by weight (via Polarized Light Microscopy), or any material that has a high probability of becoming crumbly, pulverized, or reducible to powder under handling or disturbance.

NESHAP applies to facilities defined as any institutional, commercial, public, industrial, or residential structure; a residential building with four or fewer dwelling units is exempt unless it is part of a larger installation or being demolished by intentional burning.

A thorough inspection must be performed by a Missouri-certified asbestos inspector before any demolition or renovation, and the written inspection report must be maintained on site and made available to the department upon request.

Written notification to MoDNR is required at least 10 working days before beginning any demolition, even if no asbestos is present; for renovation and abatement, notification is required before the start date when the project involves RACM.

A project is a demolition when the load-bearing structural members are removed or the structure is wrecked; a renovation is any altering of a facility that is not a demolition, including asbestos removal.

Emergency renovations (resulting from a sudden, unexpected event such as a ruptured pipe or fire) allow notification as soon as possible, with written notice and the reason for the emergency documented; the 10-working-day rule is waived only for true emergencies.

Annual notification is required for facilities where RACM will be disturbed more than once in a calendar year (e.g., routine pipe repairs); the notice must cover the calendar year and be updated if the scope changes.

Notification content includes owner/operator name and address, facility description and location, project start and completion dates, estimated quantities of RACM removed, and the name of the certified contractor.

Regulated work areas must be contained: seal doorways and windows with plastic sheeting, use critical barriers, and maintain negative pressure with HEPA-filtered exhaust. A decontamination unit with clean room, shower, and dirty room is required for abatement.

Workers must wear appropriate respiratory protection (at minimum a half-face respirator with HEPA cartridges for low-exposure work; full-face or supplied-air for higher exposures), and respirators must be fit-tested and used under a written respiratory protection program.

Wet methods are required: asbestos material must be saturated with amended water (water containing a wetting agent) before and during removal to prevent fiber release; dry removal is prohibited except for specific NESHAP exceptions.

Removed material must be bagged in leak-tight, labeled containers (typically 6-mil or double 4-mil bags) and transported and disposed of at a permitted landfill; containers are labeled with the OSHA/EPA asbestos warning.

A certified supervisor must be on site for abatement projects; workers must be Missouri-certified and complete an approved asbestos worker training course (typically 32 hours initial, annual refresher).

Air monitoring is required during and after abatement; clearance must be established by an independent third-party inspector using phase contrast microscopy (PCM) with a limit of 0.01 fibers per cubic centimeter (f/cc) inside the containment, or by TEM.

Personal exposure monitoring is required under OSHA (29 CFR 1926.1101) with a permissible exposure limit of 0.1 f/cc as an 8-hour time-weighted average and an excursion limit of 1.0 f/cc over 30 minutes.

Waste shipment records (manifests) must be kept by the contractor, and disposal must be at a landfill permitted to accept asbestos waste; records must be retained for at least two years (or as required by the landfill).

Work practices for roofing, flooring, and pipe insulation vary: non-friable roofing and flooring may be removed using specific wet methods and cutting tools; friable pipe insulation must be removed in glove bags or containment with wet methods.