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Asbestos was used for many years in building construction. It occurs naturally as a fiber. These individual fibers are so small they are invisible to the naked eye. Most asbestos is not hazardous in its original, undisturbed state. Once it is disturbed, it releases asbestos fibers. Asbestos was used in boiler and pipe insulation, plasters, floor tile, electrical insulation, and as a fireproofing material on structural members in buildings. It has also been sprayed on ceilings and walls as acoustic insulation.
In the mid 1970s several types of asbestos were banned by the EPA, due to the concern of the health effects, more specifically cancer, associated with exposure. Symptoms of asbestos related diseases do not occur soon after exposure. Those who are sick today because of asbestos may have been exposed up to 40 years ago. Controlling exposures now will prevent disease and suffering decades later.
The removal of asbestos, otherwise known as abatement, is usually done during remodeling, renovation or maintenance inside enclosures to prevent the fibers from spreading. Workers wear respirators and disposable coveralls to protect themselves during the process. To prevent any attached fibers from getting into the surrounding air, the coveralls are immediately disposed of when the worker exits. When a job has been completed, samples of the surrounding air are analyzed under a phase-contrast microscope. Based upon the results, the area is either cleared or re-cleaned and re-sampled. If the area is declared "clear," it is opened to normal occupancy and all warning signs are removed.
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The forested Green Mts. constitute the dominant physiographic feature of Vermont. They consist of at least four distinct groups, all traversing the state in a generally north-south direction. Largest and most important are the Green Mts. proper, which extend down the center of the state from the Canadian border to the Massachusetts line, rising to Vermont's highest peak, Mt. Mansfield (4,393 ft/1,339 m). The Taconic Mts., occupying the southwestern portion of the state, contain Vermont's important marble deposits. East of the Green Mts. and extending from the Canadian border to somewhat below the middle of the state are the Granite Hills, so called because of their valuable stone. The fourth group, sometimes called the Red Sandrock Hills, extends along the Vermont shore of Lake Champlain. In E Vermont there are also isolated peaks or monadnocks not connected with the principal ranges.
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