Document R21wQg1rMq27JZg4px35rdd8k

1 Federal Register ./: Vol. 51. No;'119 / Friday, June 20, 1986 / Rules and Regulations 22779 I Work Area I :: . j t nrmhlp n^p., -- I Equipment Room .1 . Double Flap l --r 1 1 - 1 Shower 1 to be built at the work site, employees, should be directed to change into a clean disposable worksuit immediately after exiting the enclosure (without removing their respirators) and to proceed Immediately to the shower. Alternatively, employees could be directed to vacuum their disposable coveralls with a HEPA-filtered.vacuum before proceeding to a shower located a distance from the enclosure. The clean room, shower, and equipment room must be sealed completely to ensure that the sole source of air flow through these areas originates from uncontaminated areas outside the asbestos removal, demolition, or renovation enclosure. The shower must be drained properly after each use to ensure that contaminated water is not released to uncontaminated areas. If waste water is inadvertently released, it should be cleaned up as soon as possible to prevent any asbestos in the water from drying and becoming airborne in areas outside the work area. 1 D9uble FIaq 1I T l j Clean Change Room I I I Double Flap j ] Figure F-C Typteal Hygiene Facility-Layout When feasible, the dean change room, shower, and equipment room should be . contiguous and adjacent to.the. negative-.. pressure enclosure surrounding the removal area. In the overwhelming number of cases, h'ygiepe facilities can be built contiguous to . the negative:pre$sure enclosure. In some. cases, however.' hygiene facilities may have to be located 'ori another floor of the building where removal,of asbestosrcontainlng materials is taking place. In these.instances, thehygiene facilities can in effeet be made io be contiguous to the work area by : constructing e.polythylcne plastic "tunnel" from the work area to the hygiene facilities. Such a tunnel can be made even in cases where the hygiene facilities are located several floors above or below the.work area; the tuiiriel begins with a double flap door at the enclosure, extends through' the exit from . the floor, continues down the necessary number of flights of stairs and goes through a double-flap entrance to the hygleirc .facilities, which have been prepared as described above. The tunnel is constructed of 2-Inch by 4-inch lumber or aluminum struts and covered with 6-mil-thick polyethylene plastic sheeting. . in the rare instances when there is not. enough space to permit any hygiene facilities Establishing Negative Pressure Within the .Enclosure After construction of the enclosure is completed, a .ventilation system(s) should be . - Installed to create a negative pressure within- the enclosure with respect to the area outside the enclosure. Such ventilation systems must be equipped with HEPAfilters to prevent the release of asbestos fibers to the environment outside the enclosure and should be operated 24 hours per day during the entire project - until the final cleanup ia completed and the results of final air samples are received from the laboratory. A sufficient amount of air should be exhausted to create a pressure of --0.02 inches of water within theienclosure . with respect to the area outside the enclosure.' ." t These ventilation systems should .exhaust the HEPA-filtered clean air outside the building in which the asbestos-removal, demolition; or renovation is taking place (see Figure Fr5);'If access to the. outside, is not available, the ventilation system can exhaust ' the HEPA-filtered asbestos-free air to an area within the building that is as far away as-' possible from the enclosure. Care should be taken to ensure that the clean air is released either to an asbestos-free areaor in such a way as not.to disturb any asbestos- containing materials.' , . !!jj'i:* hii ! ji !i ' ii: i S . GLEASON-001027