Document wqNwmx3x6jK9aO8vN89v97eDd

22780 ..........Federal Register /.Vol. 51., No, 119 / Friday, June 20, 1988 / Rules and Regulations samples should be collected from those A 8 workers who can reasonably be expected to have the highest potential exposure to asbestos. Removing Asbestos Materials Source: BPA 1985. Guidance for. Controlling Asbestos-Containing materials In Buildings (EPA 560/5-85. 024). ' Figure F-S. Examples of Negative Pressure Systems. DP, Decontamination Facility: EU. Exhaust Unit; WA, Worker Access; A, Single-room work area with.multiple windows: B, Single-room work area with single . window near entrance: C, Large single-room work area with windows and auxiliary makeup air source (dotted arrow). Arrows denote direction of air flow. Circled numbers indicate progression of removal sequence. A manometer or pressure gauge for measuring the negative pressure within the. enclosure should be installed and should be monitored frequently throughout all work shifts during which asbestos removal, demolition; or renovation takes place. Several types of manometers and pressure gauges are available for this purpose. .All asbestos removal, renovation, and demolition operations should have a program for monitoring the concentration of airborne asbestos and employee exposures .to asbestos. Area samples should be collected inside the enclosure (approximately four samples for 5000 square feet of enclosure area). At least two samples should be collected outside the work area, one at the entrance to the clean change room and one at the exhaust of the portable ventilation system. In addition, several breathing zone Paragraph ,(e)(0)(ii) requires that employers involved in asbestos removal, demolition, or renovation operations designate a competent person to: (1) Set up the enclosure; (2) Ensure the integrity of the enclosure; (3) Control entry to and exit from the enclosure; (4) Supervise alt employee exposure monitoring required bythis section; (5) Ensure the use ofprotective clothing and equipment; (6) Ensure that employees are trained in the use of engineering controls, work practices, and personal protective equipment; (7) Ensure the use oPhygiene facilities and the observance of proper decontamination procedures; and (8) Ensure that engineering controls are functioning properly. The competent person will generally be a Certified Industrial Hygienist, an industrial hygienist with training and experience in the ' handling of asbestos, or a person who has such training and experience as a result of on-the-job training and experience. Ensuring the integrity of the enclosure is accomplished by inspecting the enclosure before asbestos removal work begins and prior to each work shift throughout the entire period work is being conducted in the . enclosure. The inspection should be conducted by locating all areas where air might escape from the enclosure: this is best accomplished by running a hand over all seams in the plastic enclosure, to ensure that no seams are ripped and the tape is.securely in place. The competent person should also ensure: that all unauthorized personntil'do not enter, the enclosure and that all employees and other personnel who enter the enclosure have the proper.protective clothing end equipment. He or she should also ensure that all employees and other personnel who'enterthe enclosure use'the;hygiene facilities and observe the proper decontamination procedures (described'betow). . Proper work practices are necessary during asbestos removal, demolition, and renovation to ensure that the concentration of asbestos fibers inside the enclosure remains as low as possible. One of the most important work practices is to wet the asbestos-containing material before it is disturbed. After the asbestos-containing material is thoroughly wetted, it should be removed by scraping (as in the case of sprayed-on or troweled-on ceiling material) or removed by cutting the metal bands or wire mesh that support'the asbestos-containing material on boilers or pipes. Any residue that remains on the surface of the object from Which asbestos is' being removed should be wire brushed and wet wiped. Bagging asbestos waste material promptly after its removal is another work practice control that is effective in reducing the airborne concentration of asbestos within the GLEASON-OOI028