Nevada Administrative Code
Chapter 618 - Occupational Safety and Health
ABATEMENT OF ASBESTOS
Performance of Activities for Abatement
Section 618.956 - Project for the abatement of asbestos: Final clearance

1. Before an area of a structure or building where a project for the abatement of asbestos was performed is allowed to be reoccupied, the contractor shall obtain final clearance from a monitor. The monitor may not be an employee of the contractor or the owner of the building or structure, unless a variance is granted by the Division.

2. After all the materials containing asbestos have been removed and the work area has been washed and vacuumed using a vacuum with high efficiency particulate air filtration, the work area must be:

3. Before issuing a final clearance, the monitor shall conduct final clearance tests by collecting where feasible:

4. The average concentration of airborne asbestos fiber in all final clearance tests must be equal to or below 0.01 fibers per cubic centimeter of air. The samples must be analyzed using the method set forth in Appendices A and B of 29 C.F.R. § 1926.1101, Appendix A of Subpart E of 40 C.F.R. Part 763 or Method No. 7400, entitled "Asbestos and Other Fibers by PCM." These results are required on all samples taken before the containment barrier and exhaust air filtration system are removed. If those results are not obtained, the area must be rewashed and allowed to dry and samples must be taken again.

5. The monitor shall determine whether the requirements set forth in this section for final clearance tests are feasible for the work area. If the monitor determines that they are not and uses an alternate method for monitoring the air, he or she shall describe the rationale for using that method in the final clearance documents.

6. Notwithstanding the provisions of this section, a monitor shall not issue a final clearance if final clearance would allow an occupant of the area to be exposed to an 8-hour time-weighted average of airborne asbestos fibers in excess of 0.01 asbestos fibers per cubic centimeter of air as provided in subsection 1 of NAC 618.907.

7. After the monitor has made the determination that the requirements of this section have been satisfied and the area is safe from any asbestos hazard, he or she shall direct the contractor to apply a lock down agent to all surfaces where material containing asbestos was removed, unless a variance is granted by the Division. After the agent is applied, the monitor shall prepare the final clearance documentation and the remaining equipment and containment barrier may be removed.

8. The monitor shall deliver the final clearance documentation to the owner of the building or structure, and deliver a copy of all reports and documents, including the final clearance, to the contractor and, if requested by the Enforcement Section, to the Enforcement Section.

9. The monitor may determine the accuracy of a phase contrast microscopy final clearance sample that is more than 0.01 fibers per cubic centimeter of air by reanalyzing the sample by transmission electron microscopy by using Method No. 7402, entitled "Asbestos by TEM-7402" adopted by reference in NAC 618.906.

10. The monitor shall ensure that the area of a structure or building where a project for the abatement of asbestos was performed is safe to be reoccupied.