DHS 159.31(4)(4) Abatement project work practices. State-of-the-art work practices for asbestos abatement projects, including all of the following: DHS 159.31(4)(a)(a) Assessment of the work area, including site preparation considerations. DHS 159.31(4)(b)1.1. Proper construction and maintenance of barriers, containments, and decontamination enclosure systems. DHS 159.31(4)(c)(c) Proper abatement work techniques to minimize fiber release, including: DHS 159.31(4)(c)7.7. Encapsulation, enclosure, and repair of asbestos-containing material. DHS 159.31(4)(d)(d) Proper worksite cleanup, waste handling and decontamination, including: DHS 159.31(4)(d)4.4. Proper donning and doffing of personal protective clothing and respirators in decontamination units.