Name the two classifications of asbestos fibers
Serpentine and Amphibole
Of the six types of asbestos fibers, which are the two most
... [Show More] common?
Chrysotile and Amosite
Which type of asbestos is the most difficult to keep wet?
Amosite
What is asbestosis?
Scarring of the lung tissue and alveoli
What is mesothelioma?
Abnormal, uncontrolled growth (pleural and peritoneal membranes).
What is lung cancer?
Abnormal, uncontrolled cell growth of the lungs.
What are pleural plaques?
Smooth, white raised irregular areas of fibrous collagen tissue that develop on the pleura and become calcified. Not considered pre-malignant. Hyaline material.
What is a latency period?
Time between exposure and onset of symptoms. Acute, intermediate, chronic. Asbestos latency is usually 10-20+ years.
What is the relationship between smoking and asbestos exposure?
Synergistic. It is 50-90x increased risk factor.
What does NESHAP stand for?
National Emission Standard for Hazardous Air Pollutants.
What is the purpose of the NESHAP regulation?
No visible emissions
Which regulatory agency enforces NESHAP?
EPA
What does AHERA stand for?
Asbestos Hazard Emergency Response
What is the purpose of the AHERA regulation?
Regulate asbestos in school buildings (public and private non-profit K-12 schools)
Which regulatory agency enforces AHERA?
EPA
What does OSHA stand for?
Occupational Safety and Health Administration
What is OSHA's purpose?
To protect the employee/worker.
What is the PEL (acronym)?
Permissible Exposure Limit
What number is associated with the excursion limit (EL)?
1.0 f/cc
What is the 8-hour TWA for PEL?
0.1 f/cc
What is the standard for asbestos clearance?
0.01 f/cc
Does OSHA have a clearance limit requirement for containments?
No, AHERA and individual states do.
Name the five asbestos control techniques.
Removal, encapsulation, enclosure, repair, and O&M
Explain the removal technique.
Taking away the hazardous material
Explain the encapsulation technique.
Covering with a liquid barrier that hardens.
What are the two types of encapsulation techniques?
Bridging and Penetration
Explain the enclosure technique.
sealing it behind a solid barrier (6-sided)
Explain the repair technique.
returning something to an intact or undamaged position (must repair prior to enclosure or encapsulation)
Explain the operations and maintenance technique? (O&M)
system of practices and procedures designed to keep asbestos in an intact position.
How far should the poly overlap on the floors and walls?
12 inches
What is the order of the decon from the work area out?
Equipment room (dirty room), air lock, shower room, air lock, clean room
Massachusetts allows exceptions to poly covering if:
Glovebags are used, for surfaces that are being abated, and surfaces that are impervious.
Walls should have at least ___layer(s) of ____ mil poly on them.
1 layer of 4 mil poly
Floors should have ____ layer(s) of ____ mil poly on them.
2 layers of 6 mil poly
Ceilings should have ____ layer(s) of ____mil poly on them.
2 layers of 4 mil poly
HVAC systems should have ___ layer(s) of ___mil poly on them.
2 layers of 6 mil poly AND be shut off.
If glovebags are used, what covering does the floor need to have?
1 layer of 6 mil poly.
How often should air be changed inside containment?
4 times per hour or every 15 minutes
What are the advantages of using a Negative Air Pressure Enclosure?
1. Contains fibers
2. Lowers concentration
3. Improve final cleanup
4. Increase worker comfort by moving air and decreasing humidity
How do you determine the number of negative air machines needed?
(L x W x H)/ (15 x MC)
Where do you put the negative air machines?
Furthest from the decon unit
What are the reasons we use pre-filters?
To protect the more expensive HEPA filter.
What are two advantages of wet removal?
1. keeps fibers down
2. aids in cleaning
What is the most used method of ceiling removal?
Wet, scrape, clean
What are two ways to remove pipe insulation?
1. Glove bag
2. Full containment
What are the four types of respirators?
1. Air purifying
2. Powered Air Purifying
3. Supplied Air
4. Self-Contained breathing apparatus
What are the two types of fit testing?
Qualitative (QLFT) and Quantitative (QNFT)
What are the four types of challenge agents used for qualitative fit tests?
1. Isoamyl acetate (IAA, smells like bananas)
2. Saccharin
3. Bitrex
4. Irritant smoke
What is the most important aspect of the respirator?
How well it fits you [Show Less]