Document nNbEOYyw6grVZzzJzamOd7R48

ENVIRONMENTAL CONTROL PROCEDURE 002 INSULATION REMOVAL May 1989 Revision 2 General Plane Superintendent Plant Manager H. De La Garza 003446 ENVIRONMENTAL CONTROL PROCEDURE 002 INSULATION REMOVAL May 1989 Revision 2 I. SCOPE II. NOTIFICATION III. RESPONSIBILITY 003447 ENVIRONMENTAL CONTROL PROCEDURE 002 INSULATION REMOVAL May 1989 Revision 2 I. SCOPE h /np-JoauH Mwsh of the insulation in the plant contains asbestos. Friable asbestos is a hazardous substance and requires special handling. fis&f&ToS P*****4^ * PA7AC-0 At:.*! pAt.r'O ,7fr*. /tir'i *A-l * CP Ai/5'^cS rt*/Z**L s-c? r A rite-t-rH tz**pic*/*< t ~ A y . No insulation of any kind will be removed^by .anynno-in the plant wthei1 than crrtrp r/t-A*> A-c'+firtP' + O . y*> a^h A^cuPr _ * , or an asbestos abatement contractor. HjmA-hsu-m_.rra.ined in the glcmehag method of asbestos abatement-- and--w-i-H ny perfouu gluvebag j-obs--and--sraai-i--sca-he-j-obs-such-as--picking- up sma-1-1- fltnpurt^-g of fallen , Small scale job identification and glovebag procedures are attached. Plant personnel and contractors will follow OSHA and MSHA regulations. Visual inspection for determination of asbestos insulation is not possible; therefore, samples need to be taken and sent to an approved asbestos lab for identification. Small and emergency jobs that require prompt attention (jobs that cannot wait for sampling and outside analytical work) will be treated as if the insulation is an asbestos containing material (ACM). A survey done in 1984 by Reynolds' Corporate Industrial Hygiene Department is available for reference. The survey was done on various lines and tanks in the plant. If the equipment that needs abatement is not on the survey, the material will be sampled for asbestos determination or considered ACM if the insulation is to be removed on an emergency. A separate procedure (ECP 002A) explains the scope and procedure required to handle an emergency insulation abatement situation. II. NOTIFICATION Notification to the Texas Air Control Board (TACB) for removal of ACM will have to be done ten (10)- days in advance of removal for quantities greater than 160 squ-are feet or 260 linear feet of pipe. Notification for large scale emergency jobs will be verbal, followed by written notification. Notification is given to TACB on form ACB-99 which is recommended by TACB. Notification for small emergency jobs is covered by a blanket notification letter to TACB every six months. 003448 1 INSULATION REMOVAL Revision 2 May 1989 III. RESPONSIBILITY A. Plant and Contractor The foreman, which must be a "competent person" (i.e., one who has completed a certified supervisor asbestos training course), having control of the crew abating ACM is responsible for the following: 1. providing a work plan for proper abatement procedures to be used for each job 2. providing protective clothing to include appropriate respirators, disposable coveralls, head and foot covering and gloves 3. posting warning signs around the work area 4. placing ACM in proper bags which are then inserted in the plant asbestos container 5. keeping a daily count of bags placed in the container and coordinating with the Environmental Group to insure that the material is removed in a timely manner from the plant (90 days maximum holding time) B. Project Engineer (large ACM removal jobs) The Project Engineer is responsible for overseeing the contractor and assuring that the proper procedures are followed and will conduct a contractor asbestos removal/repair audit as the job progresses. The Project Engineer will also have the responsibility of informing the Environmental Group that the asbestos container is full so a hazardous waste manifest can be completed and signed by the Plant Manager (or his designated representative). The Project Engineer will supervise or guide the truck in and out of the plant during pickup of the asbestos container. The green copy of the manifest will always be kept and taken to the Environmental Group for filing and documentation. C. Environmental Group The Environmental Group will be responsible for notification to TACB and preparation of the hazardous waste manifest. Spot audits and inspections will be made to evaluate compliance with safety and abatement procedures prescribed by law. A complete record of ACM disposal will be maintained. D. Safety Department The Safety Department will assist in monitoring the abatement operation and coordinate with governmental safety agencies as required. 003449 INSULATION REMOVAL Revision 2 Kay 1989 E. Competent Persons (Supervisory Asbestos Training) The Sherwin Plant has i}2 competent persons that have the proper training to assist anyone that has a question concerning asbestos. If a question or emergency arises during an off-shift, weekend or holiday, check to see if one of the competent persons is on-site for assistance and recommendations (list attached). hdlg/cs May 1989 (002 Insul Rem/ECP) 003450 3 INSULATION REMOVAL Stan Millsap Paul Matula Chris Muller 0. G. Randle Danny Reyes Hurley Moseley Chuck Taylor Danny Packebush Clyde Wise Cecil England Howard Cave Hector De La Garza May 1989 (002 Insul Rem/ECP) COMPETENT PERSONS ASBESTOS ABATEMENT Revision 2 May 1989 003451 4 GLOVEBAG TECHNIQUE FOR PIPE LAGGING REMOVAL Objective: Become familiar with the procedures used and materials necessary for the glovebag technique. Learning Tasks: Information in this section should enable participants to: Understand the concept of localized glovebag removal. CCSjp Become familiar with the necessary materials to perform the job. ,. . {.CZar Reco9ni*e the importance of proper pipe lagging preparation. Understand the basic procedures and sequence for glovebag operations* (CSJ5' aware of necessary precautions, work practices and personal protective equipment. (2^ Perform proper clean-up and disposal of asbestos-containing waste generated by this technique. XVII-1 003452 OVERVIEW OF THE GLOVEBAG PROCEDURE The glovebag consists of a 6-12 mil bag fitted with long sleeve gloves, a tool pouch and a two-inch opening used for water application. Although glovebags can be fabricated by the user for each project, most contractors p'refer to purchase ready-made bags. The size, quality, style and cost vary depend ing on the manufacturer. The cost per glovebag is in a range of $10-60 apiece. In addition to the glovebag, several other tools and materials are commonly required to perform the project success fully. These materials, listed below, are readily available from most asbestos abatement contractor suppliers. MATERIALS. 1. Glovebag (one or more depending on project size) 2. Pump-up garden sprayer (2-3 gallon size) tv. 3. Amended water (surfactant) 6. Duct tape (3-inch width) XVII-2 ( 003453 5. Polyethylene disposal bags (6 mil) 6. Smoke tubes with aspirator bulb 7. HEPA-filtered vacuum cleaner 8. Bone saw 9. Utility knife with retractable blade 10. Wire cutters 11. Tin snips (if aluminum jacket is present) 12. Polyethylene plastic (roll of 4 or 6 mil) 13. Dual cartridge respirators with high efficiency cartridges 14. Disposable full-body suits with hood and feet covering 15. Small scrub brush 16. Stapler 3 17. Several rags XVII-3 003454 18. Wettable cloth 19. Asbestos caution signs and labels 20. Reinsulation materials as necessary BEFORE STARTING THE PROJECT Two persons are required to perform the glovebag removal project. A third person is often available, however, to assist with supplies, keep unwanted visitors out of the area, and to conduct the air monitoring. Each of these team members should have received training on the use and limitations of glovebag removal projects. . They should also be, included in the respiratory protection program and medical surveillance program.. Before any work begins, all necessary materials and supplies should be brought into the work area. This work area should be roped off and warning signs posted on the perimeter to minimize the chance of visitors entering this area. Barrier tape (3-inch) with a preprinted asbestos warning works well for this purpose. The HVAC serving the work area should be shut down, if possible. Employees should be trained in emergency procedures should the XVII-4 003455 glovebag rupture. This usually includes wet cleaning and/or HEPA vacuuming procedures and a shower available at a remote location. With this phase completed, the following generic guidelines may be used for most pipe lagging projects. REMEM8ER! NEVER PERFORM GLOVEBAG REMOVAL ON HOT PIPES (OVER 150F.) This may cause the bag or gloves to melt over the workers' hands and arms. REMOVAL PROCEDURES 1. Following the manufacturer's directions, mix the surfactant with water in the * garden sprayer. 2. Have each employee put on a cartridge respi rator and check the face-fit. 3. Have each employee put on a disposable fullbody suit. Remember, the hood goes over the respirator straps. 4. Check the pipe where the work will be performed. If it is damaged (broken lagging, hanging, etc.), wrap the entire length of the pipe in polyethylene plastic and "candystripe" it with duct tape. A common error when doing XVII-5 003456 glovebag work is forgetting that loose pipe lagging several feet or even several yards away from the glovebag work may be jarred loose by the activity. This is one of the common causes of high airborne fiber concentrations during glovebag work. The other problem is failure to clean up debris on the floor and other surfaces which has accumulated and contains asbestos. If the pipe is undamaged it is still necessary to place one layer of duct tape around the pipe at each location where the glovebag will be ittached. This serves two purposes. First, it gives a good surface on which to seal the ends of the glovebag. Second, it minimizes the chance of releasing fibers when the tape at the ends of the glovebag is peeled off at the completion of the job. 5. Slit the top of the glovebag open (if necessary) and cut down the sides to accommodate the size of the pipe (about two inches longer than the pipe diameter). One brand has a zipper top and straps at each end facilitating installation of the bag on the pipe. 6. Place the necessary tools into the pouch located inside the glovebag. This will usually XVII-6 / 003457 include the bone saw, utility knife, rags, scrub brush, wire cutters, tin snips and wettable cloth. Note: It is easiest to pre-cut the wettable cloth at this point. Cut out a donut shape with the inner diameter 1/2-inch smaller than the diameter of the pipe beneath the insulation. The outer diameter of the donut should be three inches longer than the diameter of the pipe insulation being removed. Finally, cut a slit in each of the two donuts so they can be slipped around the pipe. 7. Place one strip of duct tape along the edge of the open top slit of the glovebag for reinforce ment. 8. Place the glovebag around the section of pipe to be worked on and staple the top togetherthrough the reinforcing duct tape. Staple at intervals of approximately one inch. Next, fold the stapled top flap back and tape it down with a strip of duct tape. This should provide an adequate seal along the top. Next, duct tape the ends of the glovebag to the pipe itself, previously covered with plastic or duct tape (see step 4). XVII-7 003458 9. Using the smoke tube and aspirator bulb, place the tube into the water sleeve (two-inch open ing to glovebag). By squeezing the bulb, fill the bag with visible smoke. Remove the smoke tube and twist the water sleeve closed. While holding the water sleeve tightly, gently squeeze the glovebag and look for smoke leaking out, especially at the top and ends of the glovebag. If leaks are found, they should be taped closed using duct tape and the bag should be re-tested with smoke. 10. Insert the wand from the water sprayer through the water sleeve. Using duct tape, tape the water sleeve tightly around the wand to prevent air leakage. 11. One person places his hands into the longsleeved gioves while the second person directs the water spray at the work. 12. If the section of pipe is covered with an alumi num jacket, this is removed first using the wire cutters to cut any bands and the tin snips to remove the aluminum. It is important to fold the sharp edges in to prevent cutting the bag when it is placed in the bottom. Use caution to prevent cuts - these edges are sharp! XVII-8 00345 13. With the insulation exposed, use the bone saw to cut the insulation at each end of the section to be removed inside the glovebag. Note: A bone saw is a serrated heavy-gauge wire with ring-type handles at each end. Throughout this process, water is sprayed on the cutting area to keep dust to a minimum. 14. Once the ends are cut, the section of insulation should be slit from end to end using the utility knife. The cut should be made along the bottom of the pipe and water continuously supplied. Again, care should be taken when using the knife not to puncture the bag. Some insulation may have wire to be clipped as well. 15. Spray all tools with water inside the bag and place back into pouch. 16. The insulation can now be lifted off the pipe and gently placed in the bottom of the bag. 17. Using the scrub brush, rags and water, scrub and wipe down the exposed pipe inside the glovebag. Note: The inexpensive horse rubdown mittens work well for this. XVII-9 0034G0 18. Wet the donut-shaped pieces of wettable cloth over the exposed ends of insulation remaining on the pipe. Wettable cloth is a plaster impreg nated fiberglass webbing available at many hardware and/or plumbing supply stores. 19. Remove the water wand from the water sleeve and attach the small nozzle from the HEPAfiltered vacuum. Turn on the vacuum only briefly to collapse the bag. 20. Remove the vacuum nozzle and twist the water sleeve closed and seal with duct tape. 21. From outside the bag, pull the tool pouch away from the bag and twist it to separate if from the bag. Place duct tape over the twisted portion and then cut the tool, bag from the glovebag, cutting through the twisted/taped section. In this manner, the contaminated tools may be placed directly into the next glovebag without cleaning. Alternatively, the tool pouch with the tools can be placed in a bucket of water, opened underwater, and the tools cleaned and dried without releasing asbestos into the air. Note: Rags and the scrub brush cannot be cleaned in this manner and should be XVII-10 0034G1 discarded with the asbestos waste. If more than one adjacent section of pipe is to be removed, the glovebag may be loosened at each end and slid along the pipe to the next section. In this case, the tools would remain in the bag for continued use. 22. With the removed insulation in the bottom of the bag, twist the bag several times and tape it to keep the material in the bottom during removal of the glovebag from the pipe.. 23. Slip a 6 mil disposal bag over the glovebag (still 3 attached to the pipe). Remove the tape and open the top of the glovebag and fold it down into the disposal bag. 24. Remove the disposable suits and place these into the bag with the waste. 25. Twist the top of the bag closed, fold this over, and seal with duct tape. Label the bag with a warning label. 26. Using a clean damp rag, wipe the exterior of ^ the respirator and leave the work area. Remove the respirator. XVII-11 003462 27. Asbestos-containing material must be disposed of at an approved landfill in accordance with EPA regulations. 28. Air sampling should be conducted during and after completion of glovebag projects to deter mine if undetected leakage occurred. Sampling should be done by qualified persons with imme diate analyses provided. Once the area has. met the criteria for re-entry by unprotected person nel, the barriers may be removed and reinsula tion completed. For further information con cerning sampling procedures and clearance criteria, see the section entitled, "Air Sampling Requirements." XVII-12 003463 Federal Register / Vol- SI. No. 119 / Friday. June 20. 19S6 / Rules and Regulations 22735 Appendix C to | ISMJS--Work Practices eod Engiossring Controls for Small-Seal*. Sbort-Duratioo Asbettoa Renovation and Maintenance Aciiviti-- ' NooMaodatory This appendix is not mandatory, ia that construction industry employers may choose to comply with ali of the requirements of OSHA's final rule for occupational exposure to asbestos is the construction industry. 1192B.S&. However, employers wishing to be exempted from the requirements of paragraphs (e)(6) and (f)(2Kii)(ff) of | lJ- shall comply with the provisions of this appendix when performing small-scale. short* duration renovation or maintenance activities. OSHA anticipates that employers in the electrical, carpentry, utility, plumbing, and interior construction trades may wish to avail themselves of the final standard's exemptions for small-scale.' short-duration renovation and maintenance operations. Definition ofSmoilScoie. Short-Duration Activities For the purposes of this appendix, smallscale. short-duration renovation and maintenance activities are tasks such as. but not limited to: Removal of asbestos-containing insulation on pipes: Removal of small quantities of asbestoscontaining insulation on beams or above ceilings Replacement of aa asbestos-containing gasket oq a valves Installation or removal of a small section of drywalh Installation of electrical conduits through or proximate to asbestos-containing materials. Evidence in the record (see the Summary and Explanation section of the preamble for paragraph (g). Methods of Compliance, for specific citations) suggests that the use of certain engineering and work practice controls it capable of reducing employee exposures to asbestos to levels below the final standard's action level (0.1 f/cc). Several controls and work practices, used either singly or in combination, can be employed effectively to reduce asbestos exposures during small maintenance and renovation operations. These include Wet methods: Removal methods --Use of Clove bags --Removal of entire asbestos Insulated pipes or structures --Use of mini-enclosures Enclosure of asbestos materials; and Maintenance programs. This appendix desenbes these controls and work practices in detail. Preparation ofthe Area Before Renovation or Maintenance Activities The first step in preparing to perform a small-scale, short-duration asbestos renovation or maintenance task, regardless of the abatement method that will be used, is the removal from the work area of all objects that art movable to protect them from asbestos contamination. Objects that cannot be removed must be covered completely with a 6-mil-thick polyethylene plastic sheeting before the task begins. If objects have already been contaminated, they should be thoroughly cleaned with a High EfTtcieney Particulate Air (HEPA) filtered vacuum or be wet wiped before they are removed from the work area or completely encased in tha plastic. Wet Methods Whenever feasible, sod regardless of the abatement method to be used (e.g- removal. - enclosure, use of glove bags), wet methods must be used during small-scale, short duration maintenance and renovation activities that involve disturbing asbestos- containing materials. Handling asbestos materials wet is one of the moat reliable methods of ensuring that asbestos fibers do not become airborne, and this practice should therefore be used whenever feasible. As discussed in the Summary and Explanation section of the preamble for paragraph Ig). Methods of Compliance, wet methods can be used in the great majority of workplace situations. Only in cases where asbestos work must be performed on live electrical equipment, on live steam lines, or in other areas where water will seriously damage materials or equipment may dry removal be performed. Amended water or another wetting agent should be applied by means of an airless sprayer to minimize the extent to which the asbestos-containing matenal is disturbed. .-- .. Asbestos-containing materials should be wetted from the initiation of the maintenance or renovation operation and wetting agents should be used continually throughout the work period to ensure that any dry asbestoscontaining material exposed in the c (he work ia wet and remains wet un. disposal. Removal ofSmallAmount ofAsbestosContaining Materials Several methods can be used to remove small amounts of asbestos-containing materials during small-scale, short-duration renovation or maintenance tasks. These include the use of glove bags, the removal of an entire asbestos-covered pipe or structure, and the construction of mini-enclosures. The procedures that employers must use for each of these operations if they wish to avail themselves of the final rule's exemptions are described in the following sections. Clove Bogs Aa discussed io the Summary and Explanation section of the preamble for paragraph (g). Methods of Compliance, evidence ia the record indicate that the use of glove bags to enclose the work area during mall-scale, short-duration maintenance or renovetioa activities will result in employee exposures to asbestos that are below the final standard's action level of 0.1 Hoc. This appendix provides requirements for glovebag procedures to be followed by employers wishing to avail themselves of the standard's exemptions for each activities. OSHA has determined that die use of these procedures will reduce the 6 hour time weighted average (TWA) exposures of employees involved in these work operations to levels beio* aetion level and will thus provide a employee protection equivalent to thprovided by compliance with all provision: of the final nils. Clove Bog Installation. Clove bags are approximately 40-inch-wide times 64-inchloeg bags fitted with arms through which the work cao be performed (see Figure C-l(AJ). When properly installed and used, they permit workers to remain completely isolated from the asbestos material removed or replaced inside the bag. Clove bags can thes provide a fiexibile. easily installed, and quickly dismantled temporary small work area enclosure that is idesl for small-scale asbestos renovation or maintenance jobs. 0034G4 vV^ ~ 227 Fetter*! ZepsterJ Vol. 51. No. 119 / Friday, fung 20. 1386 / Rules and Regulaiiona CC) <0> njut 6-1. Dl*p** Showing Fraper Um of Clove B*f> is Sawft-SaiW. Sbort-Owotfao MainUnsnc* sad JUeovdoa Opradons. The* begs are single use control devices dux ere disposed af at the end ofeach jot The bags are made of transparent 8-mlMhidc polyethylene plastic with arras ofTyvek * material (the same material used to make the disposable protective nits used ia major atbeeloe removal, renovation, and demoRHon operations and in protective gloves). Clove bags are readily available bom safety supply stores or specialty asbestos removal supply bouses. Clove bags come pre-labeled with the asbestos warning label prescribed by OSHA and EPA for bags used to dispose of asbestos waste. Glove Bag Equipment endSupplies. Supplies and materials tbat are necessary to use glove begs effectively include: (1) Tape to seal the glove beg to the area from which absbestos is to be removed: ' - (2} Amended water or other wetting agents (3) An airless sprayer for the application of the wetting agent; ' Mvftttoo of trad* mim or coovnercUl products do** not constitute endorsement or rocommendstlon for use. (4) Bridging eneapeslent (a paate-Qkn substance /orcoariog aebeetoe) to real tho rough edges of any asbestos containing materials that remain wUfcift the glove bag at the points of attachment after the rest of the asbestoe bat be removed; (5) Tools such ae razor knives, mpa. and wire brushes (or other tools suitable for cutting wire, etc.); (6) A HEPA filter-equipped vacuum for evacuating the glove bag {to minimize the release of asbestos fibers) during removal of the bag from the work area and for cleaning any material that may hava escaped during the installation of the glove bag; and (7) HEPA-equipped dust cartridge respirators for use by the employees involved in the removal of asbestos with the glove bag. Glove Bog Work Practices. The proper use of glove bags requires the following steps: (1) Clove bags must be installed so that they completely cover the pipe or other structure where asbestos work is to be done. Clove bags are installed by cutting the aides of the glove bag to fit the size of the pipe from which asbestos is to be removed. The glove beg ia attached to the pipe by folding the open edge* together and securely sealing. them with tape. All openings in the glove bag must be sealed with duet tape or equivalent materiaL The bottom seem of the glove bag must also be sealed with duct tape or equivalent to prevent say leakage from the bag that may result from a defect in the bottom seam (Figure C-1(B)J. (2) The employee who is performing the asbestos removal with the glove bag must doo a half mask dual-cartridge HEPAequipped respirator: respirators should be wore by employees who are io dose contact with the glove hag and who may thus be exposed as a result of small gaps in the seams of the bag or holes punched through the bag by a razor knife or a piece of wire mesh. (3) The removed asbestos material from the pipe or other surface that has fallen into the enclosed bag must be thoroughly wetted with wetting agent (applied with an airless sprayer through the pre-cut port provided in most gloves bags or applied through a small bole cut in the bag) (Figure G-1(C]]. (4) Once the asbestos material has been thoroughly wetted, it can be removed from the pipe, beam or other surface. The choice of tool to use to remove thessbeetoe-centsining material depends on the type of materiel to be removed. Asbeetos-contain'mg materials are generally covered with pointed eanver and/or wire mesh. Painted canvas can be cut with a razor totife and peeled away from the asbestos-containing material underneath. Cnee the-canvas has been peeled away, the asbestos-containing material underneath may be dry. In which case it should be re-sprayed with a wetting agent to ensure that K generates as little dust as possible when removed. If the asbestoe-containing material is covered with wire mesh, the mesh should be cut with nipt, tin snips, or other appropriate tool and removed. A wetting agent must then be ueed to spray any layer of dry material that it exposed beneath the mesh, the surface of the stripped underlying structure, and the inside of the glove bag. (5) After removal of the layer of asbestoscontaining materiaL the pipe or surfaoe from which asbestos has bees removed must be thoroughly cleaned with a wire brush end wet wiped with a wetting agent until no traces of the asbestos containing material can be seen. (6) Any asbestos containing insulation edges that have been exposed as a result of the removal or maintenance activity must be encapsulated with bridging encapsulant to ensure that the edges do not release asbestos fibers to the atmosphere after the glove bag has been removed. (7) When (he asbestos removal and encapsulation have been completed, a vacuum hose from a HEPA filtered vacuum must be inserted into the glove bag through the port to remove any air in the bag that may contain asbestos fibers. When the air has been removed from the bag. the bag should be squeezed tightly (as dose to the top as possible), twisted, and sealed with tape, to keep the asbestos materials safely in the bottom of the bag. The HEPA vacuum can 0034G5 Federal Register / VoL 51. No. 119 / Friday. June 20. 19M / Rules and Regulations 227E then be removed from the beg end lit (love beg itself can be removed from the work eree to be disposed of properly (Figure G-t(D)). To# tie* Sid* View York Art* "T I II II II II I I I ms tic curt* In Clung* kooa n ni ii n n i Vti.. tx curtain Yacuua hose Mast curt^ Chang* kooa Mastic Curtain I I---------------- 1 I Caution I (Contains | lAsfrtstosI II Vacuum hos* Mini-Ertdoeurm la eoate Instances. each es remove] of eebeetos from e smell veaHletlan system or from e short length of duct e |love beg mey not be either Urge enough or of the proper shepe to enclose the work ares. to such cssa,.e mini-enclosure can be built eround the eree where smell-scale, short-duration asbestos meintensncs or renovation work la to be performed (figure C-2). Such an enclosure should be constructed of *-mil- thick polyethylene pieetic sheeting and can be small enough la restrict entry to the asbestos work area to one worker. for example, a mini-enclosure can be built in a small utility closet when asbestos- containing duct covering is to bo removed. The enclosure is constructed by: (If Afllxing plastic sheeting to the walla with spray adhesive and taps; I (2) Covering the floor with plastic and sealing the plastic covering the floor to the plastic on the walla. (3) Sealing any penetrations such "n * or electrical conduits with tape: a (4) Constructing a small change (approximately 3 feet square) made of 6-milthick polyethylene plastic supported by 2inch by 4-inch lumber (the plastic should beattached to tha lumber supports with staple: or tpray adhesive end tape). Tha change room should be contiguous to the mini enclosure, and is necessary to alio* the worker to vacuum off his protective coverelta and remove them before leaving th work area. While inside the enclosure, the worker should wear Tyvek' disposable coveralls and use tha appropriate HEPA filtered dual cartridge respiratory protection The advantages of mini-enclosures are th. they limit the spread of asbestos contamination, reduce the potential exposut of bystanders and other workers who may c working in sdiacent areas, and are quick an easy to install. The disadvantage of minienclosures la that they may be loo small to contain tha equipment necessary to create s negative pressure within the enclosure: however, the double layer of plastic sheetin will servo to restrict the release of asbestos fibers to the area outside the enclosure. Remoral ofEntire Structures When pipe* are insulated with asbestoscontaining materials, removal of the entire pipe may be more protective, easier, and more coat-effective than stripping the asbestos insulation from the pipe. Before such a pipe is cut tha asbestos-containing insulation must be wrapped with t polyethylene plastic and securely duct tape or equivalent This plastic u. .nr. will prevent asbestos fibers from becoming airborne as a result of the vibration created by the power saws used to cut the pipe. If possible, the pipes should be cut at location that are not insulated to avoid disturbing tft asbestos. U s pipe is completely insulated with asbestos-containing materials, small sections should be stripped using the glovebag method described above before the pip. la cut at tha stripped sections. Endoeure The decision to enclose rather then remo< asbestos-containing material from an tree depends on the building owner's preference La. foe removal or containment. Owners consider such fsetots at cost effectiveness, the physical configuration of the work area, and the amount of traffic in tha area when determining which abatement method to ust If the owner chooses to enclose the structure rather than to remove the asbestos containing material insulating it. a solid structure (airtight wails and ceilings) must b buih around the asbestos covered pipe or structure to prevent the release of asbestoscontaining materials into the area beyond th enclosure snd to prevent disturbing these MemJon of tnde names or commeiciti produc does not constitute endorsement or recommendation for use. 0034GB ft-V;