Presentation on theme: "Asbestos Methods & Materials. Over View What is Asbestos? Common Sources Why look for it? What to look for? Community Concerns Regulations Equipment How."— Presentation transcript:
Asbestos Methods & Materials
Over View What is Asbestos? Common Sources Why look for it? What to look for? Community Concerns Regulations Equipment How to handle ACMs Safety Practices Environmental
What is Asbestos? 6 Naturally occurring fibrous minerals Broken down into 2 groups: – Amphibole-straight rod like fibers – Serpentine-easier to wet
Asbestos Types Friable – Crumbled with hand pressure – More likely to become airborne – Regulated by all agencies Non-friable – Typically bound within a matrix – Regulated by OSHA, MPCA
Definition of Asbestos Containing Material (ACM) Greater than 1% by weight of Asbestos Only Detected using – Polarized Light Microscopy or, – Electron Microscopy
Properties of Asbestos Tensile strength of steel Heat resistant Water resistant Chemical resistant Non-conductive of electrical current Aerodynamic Breaks down to fibers smaller than bacteria – 1 cu. in of Asbestos = 15 Million Miles
Common Building Use Heating/Cooling System Insulation Electrical System Insulation Structural Fireproofing Sound Attenuation Flooring and Mastics Roofing Materials Gaskets Cooling Towers Waste piping Non- Suspect Materials Concrete Glass Fiberglass Metal Wood Styrofoam Neoprene
Common Sources of Asbestos Exposure: The construction industry Buildings built before 1985 Building demolition Renovation activities Some automotive parts (Brake pads, clutches) Pipe & furnace insulation Vermiculite Insulation Among many others
Why look for it? Exposure to asbestos may increase the risk of asbestosis, other nonmalignant lung disorders, lung cancer, mesothelioma, and other cancers. OSHA established regulations dealing with asbestos exposure on the job, specifically in construction work.
What to look for… Because asbestos fibers are microscopic (about 1,000 times smaller than the diameter of a human hair), the presence or absence of asbestos fibers cannot be determined by sight alone
What to look for… If you don't know whether construction materials contain asbestos, assume they do until laboratory testing proves otherwise Especially if the materials are crumbling, peeling, cracking, water-stained or blistering.
What to look for… Sprayed-on or troweled-on surfacing materials (such as plaster, popcorn ceilings, etc.) Insulation around pipes, boilers, ducts or hot water tanks Attic and wall insulation Floor tiles (asphalt, rubber etc.) & the backing materials used to install tiles (Mastic)
What to look for Cont… Window Caulking and Glazing Ductwork There are many applications in which ACMs were used If you are unsure about a material ASK a supervisor. Supervisor should consult a Testing Company to verify if it is an ACM.
A History of ACMs A.C.M.s= Asbestos Containing Materials Was highly valued for its nearly indestructible nature, fireproofing qualities, and lightweight fibrous nature From mid 1800s to the mid 1980s, asbestos was used in over 3000 building products
A history of ACMs Usage increased in buildings and other items through early to mid 1900s
A History of ACMs These products become dangerous when they are damaged, decayed, crumbled, or likely to let asbestos fibers escape into the air where they can be inhaled. Some of these products have been banned by federal law Some products replaced by other materials Some remain legally produced today
Regulation of Asbestos OSHA – Protects Workers (0.1 f/cc 8 hr TWA) – Defines Abatement Methods EPA – NESHAPS (no visible emissions) National Emissions Standard for Hazardous Air Pollutants – AHERA (Schools) – Inspect prior to renovation/demolition – Transport and Disposal of ACM Department of Health – Licensing – Establishes Abatement Methods – Regulates Friable asbestos abatement over 160 sf 260 ln – Indoor Air Quality standards (0.01 f/cc)
Communication of Hazards Building/Facility owner responsibility to determine: – 1) Presence – 2)Location – 3)Quantity Of all ACMs or PACMs prior to any work being done. Notification shall either be in writing or a personal communication between owner and the person/organization to be notified
Who to call? Building owner Facility owner Owners Rep Why? Their responsibility to determine: – Presence – Location – Quantity Physical Asbestos Report/Investigation/Survey Before any work is done on the building Ask. to see the report if there is a concern. Violating Asbestos related rules is a pricey mistake!
How We Handle ACMs… Observe and Maintain Encapsulate (bridging and penetrating) Enclose Repair (cast wrap) Remove / Abate – Keep Non-Friable material non friable – Wet, contain friable material
Abatement Methods Glove Bag/Wrap and Cut – <25 ln ft/room – <10 sq ft/room Seal tight enclosure Wet methods Vacuum collapsed Adjacent air monitoring
Full Enclosure Construction Critical barriers over all openings to Work Area and porous surfaces (2) Layers of poly over HVAC System 5-Stage Decontamination Chamber: Clean Room, Air Lock, Shower, Air Lock, Dirty Room (2) Layers of Floor Poly (1) Layer of Wall Poly Asbestos Hazard Warning Signs at approaches HEPA Filtered Negative Air Machines – 4 Air Changes per Hour – Outside exhaust preferred
Air Monitoring for Asbestos Abatement Phase Contrast Microscopy – Counts all fibers Worker exposure <0.1 f/cc – Engineering controls Wet methods Air movement – Respiratory protection Adjacent Air Monitoring during abatement – <0.01 f/cc at all time Visual Inspection after abatement Aggressive Final Air Clearance – Box fans, leaf blower – <0.01 f/cc PCM