IA Asbestos Abatement cheat sheet

Asbestos-related disease latency: asbestosis and lung cancer typically 15-30+ years after first exposure; mesothelioma 20-50 years; disease can appear after brief or low-level exposure.

Asbestosis is dose-related diffuse interstitial fibrosis; smoking does not cause it but multiplies lung cancer risk in asbestos-exposed workers (synergistic, not merely additive).

Mesothelioma is a malignancy of the pleural or peritoneal lining associated with all commercial amphibole and serpentine asbestos types; peritoneal cases correlate with higher cumulative dose.

OSHA construction standard 29 CFR 1926.1101 triggers initial medical surveillance at or above the 30-day action level: exposure at or above the PEL (0.1 f/cc 8-hr TWA) for 30 or more days per year, or at or above the excursion limit for 30 or more days per year.

Required medical surveillance elements: medical and work history with asbestos emphasis, physical exam, chest X-ray (ILO B-reader classification), pulmonary function tests (FVC, FEV1), and completion within 30 calendar days after assignment, with annual review.

Employee must receive a copy of the physician's written opinion within 30 days; the opinion covers fitness for duty, exposure limitations, and smoking cessation information, and excludes other findings.

Exposure monitoring: 8-hour TWA PEL 0.1 f/cc; 30-minute excursion limit 1.0 f/cc; action level 0.1 f/cc TWA (8-hour) - the action level equals the PEL numerically under the construction standard.

Medical removal protection: a worker removed due to asbestos-related medical restrictions retains seniority and, under the construction standard, is not required to lose pay/benefits for the removal period.

Records: medical records retained 30 years after termination; exposure monitoring records retained 30 years; training records retained 1 year beyond last employment.

NESHAP (40 CFR Part 61, Subpart M) covers demolition/renovation of facilities, disposal, and asbestos waste handling; the Asbestos Hazard Emergency Response Act (AHERA, 40 CFR 763 Subpart E) governs schools (K-12).

NESHAP regulated asbestos-containing material (RACM): friable ACM, CAT I nonfriable that will be crumbled/dry-sawed/pulverized or has been subjected to grinding, and Category II nonfriable likely to become crumbled/dry-sawed/pulverized.

NESHAP notification: written notice to the delegated state/local agency at least 10 working days before demolition or renovation; thresholds are 260 linear feet, 160 square feet, or 35 cubic feet of RACM on pipes, facility components, or other components.

NESHAP removal requirement: all RACM must be removed before demolition; in renovation, RACM must be removed before the component is wrecked or the operation that would crumble it.

OSHA construction standard 29 CFR 1926.1101 governs abatement, renovation, and demolition; general industry standard 29 CFR 1910.1001 governs manufacturing and brake/clutch work; shipyard standard is 29 CFR 1915.1001.

Class I work = removal of Thermal System Insulation (TSI) or surfacing ACM/PACM; Class II = removal of ACM other than TSI/surfacing (e.g., floor tile, roofing, siding); Class III = repair/maintenance of ACM likely to disturb it; Class IV = cleanup of dust/debris from Class I-III work.

Four OSHA work classifications determine controls: Class I requires critical barriers/negative pressure and regulated area; Class II may use mini-enclosures and HEPA vacuums depending on material; Class III requires local exhaust or wet methods and respiratory protection.

Competent person: OSHA requires a designated competent person capable of identifying hazards and with authority to take prompt corrective action; on Class I and Class II work the competent person must be trained and, for Class I, be a supervisor.

EPA Model Accreditation Plan (MAP) requires accredited training for workers, supervisors, project designers, inspectors, management planners, and contractor/supervisors on public/commercial buildings; accreditation is state-administered.

Training/competency: 4-hour asbestos awareness for maintenance workers who incidentally disturb ACM; 8-hour Class II; 40-hour abatement worker and supervisor (plus annual refresher); 24-hour inspector/management planner/contractor courses have specific durations.

Recordkeeping and notification: EPA/OSHA require 30-year retention of exposure/medical records, and NESHAP requires the waste shipment record (WSR) to be retained 2 years.

Six regulated asbestos minerals: chrysotile (serpentine); amosite (grunerite), crocidolite (riebeckite), anthophyllite, tremolite, and actinolite (amphiboles). Chrysotile accounts for about 95% of commercial use.

ACM is defined as material containing more than 1% asbestos by weight (EPA and OSHA); a material with 1% or less is not regulated ACM under those programs.

Friable = can be crumbled, pulverized, or reduced to powder by hand pressure when dry; nonfriable materials become regulated when they will be crumbled or pulverized by the planned work.

Bulk sampling: AHERA requires at least 3 samples per homogeneous area for surfacing and TSI, and at least 3 for other materials; samples analyzed by PLM (polarized light microscopy) with gravimetric/point-count reduction to determine percent asbestos.

PLM with dispersion staining is the standard method (EPA 600/R-93/116); if PLM cannot resolve (e.g., <1% or organically bound), TEM (transmission electron microscopy) or gravimetric analysis may be required.

Homogeneous area (HA) = an area of surfacing material, TSI, or miscellaneous material that is uniform in color and texture; each HA must be sampled separately.

Presumed ACM: AHERA allows sampling or presumption; if not sampled, materials are presumed ACM and must be treated as such.

Building assessment sequence: review plans/records, walk-through to inventory suspect materials, sample or presume, then evaluate condition (good, damaged, significantly damaged) and accessibility to determine hazard and response action.

PACM (presumed asbestos-containing material) applies to TSI and surfacing materials in buildings constructed before the applicable cutoff (often 1980 per AHERA presumption for schools, though the AHERA rule presumes TSI/surfacing in pre-1981 schools).

Category I nonfriable: asphalt roofing, shingles, gaskets, resilient floor coverings; Category II: all other nonfriable (e.g., asbestos cement products, transite). Category II becomes RACM if it will be crumbled, pulverized, or reduced to powder.

Abatement plan must define scope, work classification (Class I-IV), engineering controls, PPE, waste handling, clearance criteria, and emergency procedures before work begins.

Pre-abatement inspection must identify all ACM in the work area and adjacent spaces, including hidden materials (behind walls, above ceilings, in pipe chases) that could be disturbed.

Notification and permits: NESHAP 10-working-day notice to the delegated agency; local air quality permits; building owner notification; posting of regulated area signs at all entrances.

Regulated area must be demarcated with warning signs reading 'DANGER - ASBESTOS - CANCER AND LUNG DISEASE HAZARD - AUTHORIZED PERSONNEL ONLY' and access limited to trained, authorized workers.

Occupant protection: relocate or protect occupants; seal HVAC openings; shut down and lock out air-handling systems serving the work area; verify no cross-contamination paths.

Pre-cleaning and protection: remove movable items, cover immovable surfaces with 6-mil poly, seal floors, and establish a clean room/decontamination unit before containment is built.

Decontamination unit: clean room, shower, and equipment/waste room in series; workers pass clean-to-dirty on entry and dirty-to-clean on exit; shower required for Class I work.

Emergency planning: fire suppression, first aid, spill response, and evacuation routes must be established; a written respiratory protection program and hazard communication program must be in place before exposure.

Project designer (accredited) prepares specifications including containment type, negative pressure targets, air monitoring, and clearance criteria; supervisor verifies plan implementation.

Containment types: glove bag (small, localized pipe work), mini-enclosure (small area, portable), and full containment (critical barriers plus negative pressure enclosure).

Critical barriers: two layers of 6-mil poly on all openings, surfaces, and penetrations, sealed with duct tape; critical barriers isolate the work area from occupied spaces.

Negative pressure: maintain at least -0.02 inches of water column (5 Pa) differential relative to adjacent areas; verify with a manometer and record readings at least daily.

Air changes: HEPA negative air machines (NAMs) sized to provide at least 4 air changes per hour in the containment (more for large or high-disturbance work); calculate CFM = volume (ft³) × ACH / 60.

HEPA filtration: 99.97% efficiency at 0.3 microns; all exhaust from containment must pass through HEPA; NAMs exhausted outside or recirculated only through HEPA.

Decontamination unit: clean room, shower, equipment room; airlocks; workers must shower before leaving; the unit must be attached to the containment with sealed doorways.

Containment construction sequence: install critical barriers, build enclosure walls/ceiling with poly, seal seams, install decon unit, install NAMs, verify negative pressure, then post signage and begin work.

Daily inspection: check poly integrity, seals, negative pressure, NAM operation, and decon unit; repair breaches immediately and document.

Final visual inspection and air monitoring (aggressive or non-aggressive sampling) must meet clearance criteria before containment is removed; clearance air samples analyzed by PCM or TEM per project spec.

Wet methods: keep ACM wet with amended water (water plus surfactant, e.g., 0.1% wetting agent) throughout removal to suppress fiber release; rewet as needed.

Removal sequence: work from top down, remove small sections, lower materials in sealed containers, never drop or throw debris; wrap large components in poly and seal.

Class I TSI removal: use glove bags for pipe insulation where feasible; for large sections, cut and wrap; use HEPA vacuums; do not use dry methods or power tools that generate dust.

Surfacing material removal: score and remove in sections, mist continuously, and bag immediately; avoid sawing, sanding, or grinding.

Floor tile and mastic (Class II): use wet methods, heat or chemical softeners, and floor scrapers; do not dry-sweep or use high-speed grinders; mastic may be removed with solvent or by wet scraping.

Roofing (Class II): wet down, cut in sections, lower carefully; avoid dry cutting and power brooms; debris bagged and sealed.

Regulated area work practices: no eating, drinking, smoking, or chewing in the regulated area; no dry sweeping or compressed air; HEPA vacuum only; tools cleaned in the decon unit.

Waste handling during removal: bag or wrap ACM in leak-tight containers, label with required warning, and transport through the decon unit; do not overfill bags.

Worker rotation and hygiene: workers must not leave the regulated area in contaminated clothing; shower before exiting; change into clean clothes in the clean room.

Supervision: competent person must be on site for Class I and Class II work, conduct daily inspections, and stop work if controls fail.

Respiratory protection: half-mask APR with HEPA/P100 filters for exposures up to 10× PEL; full-face APR up to 50× PEL; powered air-purifying respirator (PAPR) up to 100× PEL (loose-fitting) or 50× (tight-fitting); supplied-air respirator for higher or unknown concentrations.

OSHA requires a written respiratory protection program (29 CFR 1910.134): medical evaluation, fit testing (annual, quantitative or qualitative), training, and maintenance.

Fit testing: required before initial use and annually; for tight-fitting respirators, user seal check each donning; facial hair that interferes with the sealing surface is prohibited.

PPE: disposable coveralls (Tyvek or equivalent), hood, boot covers, gloves, and eye protection; all PPE removed in the dirty/equipment room before showering.

Donning sequence: clean room → put on respirator and check seal → coveralls → hood → boot covers → gloves (tape cuffs); doffing reverse order in the equipment room, bagging disposable PPE as waste.

Respirator selection must be based on exposure assessment; if exposure is unknown or exceeds the assigned protection factor, use supplied-air or SCBA.

Medical evaluation (OSHA 1910.134) must be completed before fit testing and use; a physician or licensed health care professional determines fitness.

Respirator cleaning and storage: non-disposable respirators cleaned and disinfected after each use, stored to prevent damage; filters replaced when soiled or breathing resistance increases.

Heat stress: PPE and respirators increase heat load; implement work/rest schedules, hydration, and monitoring for heat illness symptoms.

Waste must be packaged in leak-tight containers (6-mil poly bags or drums), labeled with the required asbestos warning, and sealed; bags double-bagged and goosenecked.

NESHAP requires asbestos waste to be wetted and kept wet during handling, and transported in leak-tight containers; no visible dust.

Waste shipment record (WSR): generator completes the form, transporter signs, and the disposal site signs and returns a copy; generator retains a copy for at least 2 years.

If a WSR is not returned within 45 days, the generator must contact the transporter and/or disposal site to confirm receipt; if still unconfirmed, a report may be required.

Land disposal: asbestos waste must be disposed of at a permitted landfill that accepts asbestos; it must be covered by the end of the operating day (or as required by the permit).

Transport: vehicles must be leak-tight and placarded if required; asbestos is a hazardous material for transport under DOT (49 CFR) when in certain forms; manifests may be required.

Decontamination of transport vehicles and reusable containers before leaving the site; no visible residue; wash water collected and treated as asbestos waste.

Waste tracking: maintain inventory of containers, weights, and disposal receipts; reconcile with WSRs.

Prohibited practices: no open dumping, no burning, no disposal in unpermitted landfills, no mixing with general refuse.

Final cleaning: wet-wipe and HEPA-vacuum all surfaces, including walls, ceilings, floors, and equipment; repeat until no visible debris; then remove poly sheeting carefully.

Visual inspection: a qualified inspector confirms no visible dust or debris before air monitoring; the containment must remain under negative pressure during cleaning.

Clearance air monitoring: aggressive sampling (fans/leaf blowers to disturb settled dust) or non-aggressive, per project specification; samples analyzed by PCM (phase contrast microscopy) or TEM.

Clearance criteria: commonly 0.01 fibers per cubic centimeter (f/cc) by PCM or 70 structures per square millimeter by TEM (per AHERA); project specifications may set stricter limits.

Aggressive sampling: run fans for at least 10 minutes before and during sampling; sample volume and flow rate per method; number of samples based on area (e.g., 5 per containment or per 1,000 sq ft).

If clearance fails, re-clean and re-sample; do not remove containment until clearance is achieved and documented.

Post-abatement documentation: clearance report, waste shipment records, daily logs, air monitoring results, and a final report to the building owner.

Reoccupancy: only after clearance is achieved and the containment is removed; verify HVAC systems are clean and operational before reoccupancy.

Periodic re-inspection: for schools under AHERA, re-inspect every 3 years and update management plans; for other buildings, periodic condition assessments are recommended.