AHERA Asbestos Worker cheat sheet

Asbestos is a group of six naturally occurring fibrous silicate minerals: chrysotile (serpentine) and amosite, crocidolite, tremolite, anthophyllite, and actinolite (amphiboles).

Chrysotile fibers are curly and flexible; amphibole fibers are straight, stiff, and more durable in the lungs.

Fibers with length >5 µm, aspect ratio ≥3:1, and diameter <3 µm are considered respirable and are counted by phase contrast microscopy (PCM).

Asbestos causes asbestosis (diffuse pulmonary fibrosis), lung cancer, and mesothelioma; risk increases with cumulative dose and time since first exposure.

Smoking acts synergistically with asbestos exposure to greatly increase lung cancer risk (multiplicative effect).

Mesothelioma is a cancer of the pleura or peritoneum with a long latency (often 20–50 years) and is considered a signature asbestos-related disease.

Asbestos fibers can also cause pleural plaques, pleural thickening, and benign pleural effusions.

No safe threshold of exposure has been established; OSHA permissible exposure limit (PEL) is 0.1 f/cc as an 8-hour time-weighted average (TWA).

Asbestos-related diseases typically have long latency periods; current disease may reflect exposures decades earlier.

OSHA Asbestos Standards: 29 CFR 1926.1101 for construction; 29 CFR 1910.1001 for general industry; 29 CFR 1926.1101 covers abatement work.

EPA NESHAP (40 CFR Part 61, Subpart M) regulates asbestos emissions during demolition/renovation and requires notification and work practice standards.

EPA ASHARA (40 CFR Part 763) requires accreditation of inspectors, planners, project designers, contractors, supervisors, and workers.

AHERA defines a friable asbestos-containing material (ACM) as material that can be crumbled, pulverized, or reduced to powder by hand pressure when dry.

OSHA Class I work = removal of thermal system insulation (TSI) and surfacing ACM/PACM; Class II = removal of all other ACM except TSI/surfacing; Class III = repair/maintenance; Class IV = cleanup.

Competent person must be present on all abatement jobs; for Class I and II work, a certified supervisor is required.

State and local regulations may be more stringent than federal; always follow the most protective applicable requirement.

Employers must provide training and medical surveillance as specified by OSHA; AHERA worker training requires 32 hours initial and annual refresher.

Respirators must be NIOSH-approved; for asbestos, use a half-mask with HEPA filters (minimum) for exposures up to 10× PEL, or full-facepiece with HEPA for higher protection.

A written respiratory protection program, fit testing, and medical evaluation are required before respirator use.

Fit testing must be performed annually and whenever a different respirator model/size is used; qualitative or quantitative methods are acceptable.

User seal check must be performed each time a respirator is donned.

Disposable coveralls (Tyvek or equivalent) with hood and booties are required; no exposed skin.

Protective clothing must be removed in the equipment room (dirty side) before entering the shower; disposable clothing is discarded as asbestos waste.

Respirator cartridges/filters must be changed when breathing becomes difficult or according to manufacturer's recommendations; HEPA filters are not to be cleaned.

Eye protection (goggles) and hard hat may be required; gloves and safety shoes are also standard PPE.

PPE must not be taken home; it must be cleaned or disposed of on site.

Containment must be constructed with two layers of 6-mil fire-retardant plastic on floors and one layer on walls, with seams sealed and overlaps ≥12 inches.

Critical barriers (plastic over openings, HVAC vents, etc.) must be installed before containment construction.

Negative pressure must be maintained using HEPA-filtered negative air machines (NAMs) capable of at least 4 air changes per hour (ACH) in the containment.

Decontamination unit consists of: dirty room (equipment room), shower, and clean room, arranged in sequence.

Workers must pass through the decontamination unit in order: dirty room → shower → clean room when exiting.

The decontamination unit must be adjacent to the containment and have airlocks; doors must have overlapping plastic flaps.

A three-stage decontamination system is required for Class I work; for some Class II work, a two-stage may be allowed but check regulations.

Waste must be bagged in the dirty room and passed out through the decontamination unit or a waste chute.

Warning signs and barriers must be posted at the perimeter of the work area; access limited to authorized personnel.

Wet methods: use amended water (water with surfactant) to wet ACM before and during removal to suppress dust.

Removal sequence: remove non-friable materials first, then friable; start from top and work down; remove TSI before other components.

Never drop or throw ACM; lower materials carefully in bags or wrapped in plastic.

Use glove bags for removing pipe insulation when containment is not feasible; glove bag must be sealed and waste bagged.

For flooring, use wet methods, amended water, and careful lifting; avoid breaking tiles; use heat to soften mastic if needed.

For roofing, use wet methods and cut in sections; avoid sawing or grinding that creates dust.

Electrical and HVAC systems must be locked out/tagged out before work begins.

Daily cleanup: wet wipe and HEPA vacuum all surfaces; no dry sweeping or shoveling.

Final cleaning: HEPA vacuum and wet wipe all surfaces; then air monitoring for clearance.

Workers must shower at the end of each shift before leaving the site; showering is required after any exposure.

Do not eat, drink, smoke, or chew in the work area; only in clean areas.

Hands and face must be washed before eating, drinking, or smoking.

Medical surveillance is required for workers exposed above the PEL or at or above the action level (0.1 f/cc) for 30 or more days per year.

Medical exams include work history, physical exam, chest X-ray (per OSHA), pulmonary function tests, and smoking history.

Employers must provide medical exams at no cost to the employee and at reasonable times.

Workers must be informed of monitoring results and medical findings.

Medical records must be kept for the duration of employment plus 30 years.

Asbestos waste must be placed in leak-tight containers (e.g., 6-mil plastic bags) and labeled with OSHA warning labels.

Waste bags must be sealed (gooseneck) and cleaned before leaving the containment.

Bags must be placed in a second bag (double-bagging) or in rigid containers for transport.

Waste must be transported in covered vehicles or containers to prevent dust release.

Disposal must be at an EPA-approved landfill that accepts asbestos waste; manifesting may be required.

NESHAP requires waste to be kept wet and containerized; no visible emissions allowed during transport.

Liquid waste must be filtered or treated before disposal; do not discharge asbestos-laden water to sewers without permission.

Waste tracking documents must be retained as required by federal, state, and local regulations.

Personal air monitoring: use PCM to determine TWA; samples must be taken in the breathing zone.

Clearance air monitoring: use PCM or TEM; final clearance requires visual inspection and air concentrations below clearance criteria.

For AHERA clearance, aggressive sampling (leaf blower or equivalent) may be used; clearance level is 0.01 f/cc by PCM or 70 structures/mm² by TEM.

OSHA requires daily monitoring for Class I work; for other classes, monitoring may be required based on exposure assessment.

All air monitoring results must be posted and provided to workers.

Records: exposure monitoring records kept for 30 years; medical records for employment plus 30 years; training records for 1 year after employment.

A written compliance program and respiratory protection program must be maintained.

Clearance must be performed by an independent certified inspector or technician, not the abatement contractor.