OK Asbestos Abatement key terms

Material that contains more than one percent asbestos and can be crumbled, pulverized, or reduced to powder by hand pressure when dry. Friability drives how easily fibers become airborne.

Any material or product that contains more than one percent asbestos by weight as determined by polarized light microscopy. The threshold applies to building materials regulated under NESHAP and to OSHA worker-protection duties.

Nonfriable material containing asbestos that is not regulated as a hazardous air pollutant when intact, including packings, gaskets, resilient floor coverings, and asphalt roofing products. It becomes regulated when sanded, ground, cut, or abraded.

Friable asbestos material, plus category I and II nonfriable material that has become crumbled, pulverized, or reduced to powder, or that will be during demolition or renovation. RACM triggers NESHAP work practice standards.

Federal Clean Air Act rules, found at 40 CFR Part 61 Subpart M for asbestos, that govern demolition and renovation work, notification, handling, and waste disposal to prevent fiber release into outdoor air.

Written notice to the delegated air authority before starting a regulated demolition or renovation. It identifies the site, owner, contractor, planned start date, and estimated amounts of RACM to be removed.

Worker-protection rules at 29 CFR 1910.1001 for general industry and 29 CFR 1926.1101 for construction that set permissible exposure limits, monitoring, training, respiratory protection, and regulated-area requirements for employees exposed to asbestos.

The legally enforceable airborne asbestos concentration a worker may be exposed to over an eight-hour time-weighted average. Under OSHA the current limit is 0.1 fiber per cubic centimeter of air.

A short-term ceiling on asbestos exposure measured over a 30-minute sampling period. OSHA sets it at 1.0 fiber per cubic centimeter, ten times the eight-hour permissible exposure limit.

The state environmental agency that administers air-quality, waste, and asbestos-program requirements in Oklahoma, including accreditation of abatement workers and firms and review of NESHAP notifications for covered projects.

Formal credentialing of individuals and companies that inspect for, design abatement of, or perform work on asbestos-containing material. Accreditation follows approved training and, in many states, licensing or registration.

A firm that removes, encapsulates, or encloses asbestos-containing material for compensation. Such firms must hold required state credentials and follow OSHA and NESHAP work practice standards.

A chronic scarring disease of the lung tissue caused by inhaling asbestos fibers, typically after years of high exposure. Scarring stiffens the lungs and progressively reduces the ability to transfer oxygen into the blood.

A rare cancer of the thin membrane lining the chest or abdominal cavity, strongly linked to asbestos exposure. It can appear decades after exposure and often progresses despite treatment.

The delay, often 15 to 40 years or more, between first asbestos exposure and the appearance of related disease. Long latency means current illness can reflect exposures that ended long ago.

The route by which airborne asbestos fibers enter the body through breathing. It is the dominant pathway of concern on abatement sites, which is why engineering controls and respirators target airborne dust.

The liberation of microscopic asbestos fibers from material when it is disturbed by cutting, sanding, grinding, demolition, or deterioration. Release is the event that turns stable material into an airborne hazard.

A laboratory technique that identifies asbestos minerals in bulk samples by their optical properties under polarized light. It is the standard method for determining whether a building material contains asbestos.

A physical specimen of building material collected for laboratory analysis to determine asbestos content. Proper sampling uses discrete layers, avoids cross-contamination, and seals each sample in a labeled container.

A quantitative microscopy method in which an analyst identifies particles at grid points to estimate the percentage of asbestos in a bulk sample. It is used when a precise percentage is needed rather than a simple presence test.

Material that an inspector has not sampled but must treat as containing asbestos because of its type, age, or location, such as thermal system insulation in older buildings. It is handled under abatement controls until proven otherwise.

A sealed enclosure built from plastic sheeting and framing that isolates the work area and prevents asbestos fibers from escaping. It includes critical barriers over openings and negative pressure to keep air flowing inward.

A temporary seal over doors, windows, vents, and other openings in a containment to stop fiber migration. Barriers are installed before abatement begins and removed only after cleaning and clearance.

A condition in which air pressure inside a containment is lower than outside, so air flows inward and fibers cannot drift out. It is maintained with exhaust units and high-efficiency filters and monitored during the job.

A high-efficiency particulate air filter rated to capture at least 99.97 percent of particles 0.3 micrometers in diameter. Vacuuming and exhaust equipment on abatement sites must use these filters to trap fibers.

Techniques that apply water or a wetting agent to asbestos material before and during disturbance to suppress dust. Wetting reduces airborne fiber levels but does not eliminate the need for other controls.

A sealed plastic bag with built-in gloves and sleeves that lets a worker remove small amounts of asbestos material, such as pipe insulation, while keeping the material enclosed. It limits fiber release without a full containment.

The use of an approved respirator, such as a half-mask or full-facepiece air-purifying unit with HEPA filters, to reduce worker inhalation of fibers. It requires fit testing, medical evaluation, and training before use.

A procedure that verifies a tight-fitting respirator seals against a worker's face. It is performed before initial use and at required intervals, with the same make, model, and size the worker will wear.

Gear such as disposable coveralls, gloves, boot covers, and eye protection worn to keep asbestos fibers off skin and clothing. PPE is removed in a controlled sequence to avoid contaminating clean areas.

A staged sequence of rooms, typically clean, shower, and dirty, that workers pass through when entering and leaving a containment. It removes fibers from people and equipment and prevents contamination from spreading outside.

Visible accumulations of dust, debris, or asbestos waste that must be removed by wet wiping and HEPA vacuuming before a containment can be considered for clearance. It is distinguished from microscopic residue.

The final verification that a containment is clean enough to be dismantled or reoccupied. It combines visual inspection with air monitoring and is required before barriers and critical barriers are removed.

An air-sampling method for clearance that deliberately disturbs settled dust with forced air or brushing before sampling. It is intended to show whether fibers could become airborne under normal room activity.

A microscopy method that counts fibers in air samples but cannot distinguish asbestos from other fibers. It is the standard technique for comparing workplace and clearance air concentrations to regulatory limits.

An average exposure concentration calculated over a stated period, such as an eight-hour shift, accounting for time spent at different levels. It is the basis for comparing worker exposure to the permissible exposure limit.

A clearly marked work zone where asbestos exposure may exceed the permissible exposure limit. Access is limited to trained, authorized workers wearing required protective equipment, with warning signs posted at entrances.

Handling and transport of asbestos-containing debris in sealed, labeled, leak-tight containers to an approved landfill that accepts such waste. Shipping papers and disposal records must be retained for inspection.

Maintaining required documentation such as exposure monitoring results, training records, medical surveillance, waste manifests, and clearance reports. Records must be kept for the periods set by OSHA and state rules.