IL Asbestos Abatement key terms

Any material or product that contains more than one percent asbestos by weight, as determined by polarized light microscopy or another accepted method. Illinois and federal rules use this threshold to decide what must be regulated.

Material that a building owner or inspector treats as containing asbestos until sampling proves otherwise, covering surfacing, thermal system insulation, and miscellaneous products in older buildings. Treating it as ACM keeps work safe when testing has not occurred.

ACM that can be crumbled, pulverized, or reduced to powder by hand pressure, plus certain non-friable materials that will be disturbed. RACM triggers the strictest handling, packaging, and disposal requirements under state and federal rules.

Material containing more than one percent asbestos that can be crumbled, pulverized, or reduced to powder by hand pressure when dry. Friability drives risk because fibers release easily into air and are more likely to be inhaled.

Asbestos-containing material that cannot be crumbled or powdered by ordinary hand pressure, such as intact floor tile, roofing, or cement pipe. It still poses a hazard when cut, ground, sanded, or broken, because those actions release fibers.

Non-friable asbestos-containing material such as asphalt roofing, shingles, and gaskets that will not be crumbled by hand pressure. It becomes regulated when sanded, ground, cut, or otherwise damaged so that it may release fibers.

Non-friable asbestos-containing material that is likely to be crumbled, pulverized, or reduced to powder by the forces expected during demolition or renovation, such as asbestos cement pipe or sheet. It is regulated once disturbed.

The standard laboratory method for identifying asbestos in bulk samples by examining fiber optical properties under polarized light. A trained analyst estimates the percentage and type of asbestos present, usually down to one percent.

A light microscopy method used to count airborne fibers collected on a filter, but it cannot distinguish asbestos from other fibers. It is the usual method for air monitoring during abatement and for clearance sampling under the NIOSH 7400 method.

A high-magnification method that identifies asbestos fibers by structure and elemental composition, distinguishing them from other fibers. It is used for final clearance in some projects and for confirming asbestos types in complex samples.

Collecting small representative pieces of suspect material for laboratory analysis to determine whether asbestos is present. Proper sampling uses clean tools, avoids cross-contamination, and follows a sampling plan for each homogeneous area.

A surface or material that is uniform in color, texture, and date of application, so one set of samples can represent the whole area. Inspectors map these areas to reduce sampling while keeping results reliable.

A thorough on-site survey by a licensed inspector to locate and document all asbestos-containing and presumed asbestos-containing materials before renovation or demolition. Findings feed the management plan and abatement design.

A written plan for an asbestos-containing building that describes locations, condition, response actions, and a schedule for re-inspection. It is prepared by a licensed management planner and kept available to building occupants and workers.

A continuing program of cleaning, work practices, and periodic surveillance that keeps asbestos-containing material in good condition and prevents disturbance. It is used when removal is not immediately required and material remains in place.

Regular visual checks of asbestos-containing material, usually every six months in schools, to confirm that it remains intact and has not been damaged. Any change in condition is reported so repair or response actions can be scheduled.

Any measure taken to eliminate or reduce asbestos exposure, including removal, encapsulation, enclosure, repair, and related cleanup. Each method has its own design, work practice, and clearance requirements.

Physically taking asbestos-containing material out of a building using wet methods, containment, and careful handling. It is the most permanent abatement method but creates the greatest potential for fiber release if done poorly.

Coating or sealing asbestos-containing material with a penetrating or bridging sealant so fibers are locked in place. The material stays in the building, so the surface must remain intact and cannot be used where it will be disturbed.

Building an airtight barrier around asbestos-containing material so it is separated from occupied space. Enclosures demand careful design, access control, and labeling so future workers do not penetrate the barrier and release fibers.

A sealed enclosure, often built of plastic sheeting on a frame, that keeps asbestos fibers inside the work area. It includes critical barriers at openings, a negative pressure system, and a decontamination unit where required.

A temporary seal over openings such as doors, windows, vents, and ducts that could let fibers escape the work area. Barriers must be inspected and repaired during the job to keep the containment airtight.

Maintaining lower air pressure inside the containment than outside so air flows inward and fibers stay in the work area. It is created with exhaust fans and HEPA filters, and pressure differentials are monitored throughout the project.

A filter that removes at least 99.97 percent of airborne particles 0.3 micrometers in diameter. HEPA units are used on vacuums, negative air machines, and respirators to capture asbestos fibers.

A sequence of rooms where workers and equipment move from the work area to clean space, usually including a dirty room, shower, and clean room. The unit prevents fibers from being carried out on clothing, skin, or tools.

Equipment worn to reduce exposure, including disposable coveralls, boots, gloves, and a properly fitted respirator. PPE must be removed and disposed of or cleaned before leaving the decontamination unit.

A tight-fitting mask, usually a half-face or full-face air-purifying type with P100 filters, worn to filter asbestos fibers. Workers must be medically cleared, fit tested, and trained before use.

A test that verifies a respirator seals against a worker's face, using either qualitative or quantitative methods. It is repeated at least annually and whenever the model, size, or facial condition changes.

Techniques that keep asbestos-containing material damp during removal, cutting, or cleanup so fibers are less likely to become airborne. Water or amended water is applied continuously, and dry sweeping or air blowing is prohibited.

Water mixed with a surfactant that helps it penetrate asbestos-containing material and suppress dust. It is used in wet removal, cleaning, and misting to reduce airborne fiber concentrations.

Air monitoring performed after abatement and cleaning to confirm fiber levels are acceptably low before the containment is removed. Results are compared with the project's stated clearance standard and documented in a report.

A clearance sampling technique that stirs up air, for example with fans or by brushing surfaces, to simulate normal activity and reveal any remaining contamination. It is often required for final clearance in school and public building projects.

A licensed professional who writes the abatement plan, including scope, methods, containment, air monitoring, and clearance criteria. The design must match the site conditions and the regulatory requirements for the project type.

A licensed firm that performs abatement work and is responsible for supervision, worker training, notifications, waste handling, and compliance on the job. The contractor must hold the license required by the state before bidding or working.

The on-site person who directs abatement workers, enforces work practices and safety rules, and ensures the containment and decontamination systems function properly. Illinois requires a licensed supervisor on certain projects.

A written notice to the state or local air authority before starting work that disturbs regulated asbestos-containing material, describing the project, location, and scheduled dates. Late or missing notice can stop a project and bring penalties.

Placing removed asbestos material in leak-tight, labeled containers and transporting it to an approved landfill, with manifests tracking the shipment. Waste must be handled wet where required and kept from dusting during transport.

The maximum airborne fiber concentration allowed before a containment is released, stated in the project design and often expressed as fibers per cubic centimeter by PCM. Meeting it is required to finish the job.

A trained and licensed person who performs abatement tasks under supervision, including removal, cleanup, and containment work. Workers must complete an approved course and refresher training and use required protective equipment.