Connecticut Administrative Code › Title 19a - Public Health and Well-being › 332a - Standards for Asbestos Abatement › Section 19a-332a-12 - Post abatement reoccupancy criteria for asbestos abatement projects for friable asbestos-containing material

Current through July 10, 2024
(a) No individual
			 shall reoccupy the work area of an asbestos abatement project within a facility
			 until compliance with the reoccupancy requirements of this section is
			 achieved.
(b) Except as required by
			 EPA Regulation 40 CFR Part 763 which applies to public and private schools, an
			 asbestos abatement project shall be considered complete when there is no
			 visible residue in the work area and when air samples demonstrate that the
			 ambient interior airborne concentration of asbestos after the abatement
			 project, does not exceed the levels specified in Subsection
			 19a-332a-12(e).
(c) Air samples shall be collected using
			 aggressive sampling as described in Appendix A of 40 CFR Part 763, subpart E to
			 monitor air for post abatement reoccupancy after each asbestos abatement
			 project.
(d) Air samples collected
			 under this Section shall be analyzed for asbestos using laboratories accredited
			 by the National Institute of Standards and Technology to conduct such analysis
			 using transmission electron microscopy (TEM) or:
Under circumstances specified in this section, laboratories
				accredited by the American Industrial Hygiene Association Proficiency
				Analytical Testing Program for phase contrast microscopy (PCM); or individuals
				listed in the American Industrial Hygiene Association's Asbestos Analyst's
				Registry, or until the National Institute of Standards and Technology TEM
				laboratory accreditation program is operational, laboratories that use the
				protocol described in Appendix A of 40 CFR Part 763, Subpart E.
(e) Except as provided for in
			 Subsections
			 19a-332a-12(f),
			 and
			 19a-332a-12(g),
			 an asbestos abatement project shall be considered complete when the average
			 concentration of asbestos of five air samples collected within the work area
			 and analyzed by the TEM method in Appendix A of 40 CFR Part 763 subpart E, is
			 not statistically significantly different, as determined by the Z-test
			 calculation found in Appendix A of 40 CFR Part 763, subpart E, from the average
			 asbestos concentration of five air samples collected at the same time outside
			 the work area and analyzed in the same manner, and the average asbestos
			 concentration of the three field blanks described in Appendix A of 40 CFR Part
			 763, subpart E, is below the filter background level, as defined in Appendix A
			 of 40 CFR Part 763 subpart E, of 70 structures per square millimeter (70
			 s/mm2).
(f) An asbestos abatement project may also be
			 considered complete if the volume of air drawn for each of the five samples
			 collected within the work area is equal to or greater than 1,199 L. of air for
			 a 25 mm. filter or equal to or greater than 2,799 L. of air for a 37 mm.
			 filter, and the average concentration of asbestos as analyzed by the TEM method
			 in Appendix A, of 40 CFR part 763 subpart E. For the five air samples does not
			 exceed the filter background level, as defined in Appendix A, of 70 structures
			 per square millimeter (70 s/mm2). If the average
			 concentration of asbestos of the five air samples within the work area exceeds
			 70 s/mm2, or if the volume of air in each of the
			 samples is less than 1,199 L. of air for a 25 mm. filter or less than 2,799 L.
			 of air for a 37 mm. filter, the project shall be considered complete only when
			 the requirements of subsections
			 19a-332a-12(e)
			 and
			 19a-332a-12(g)
			 are met.
(g) Air samples for post
			 abatement reoccupancy may be collected and analyzed by phase contrast
			 microscopy (PCM) to confirm completion of an asbestos abatement project
			 involving less than or equal to 1500 square feet or 500 linear feet of
			 asbestos-containing material. The project shall be considered complete when the
			 results of samples collected in the work area and analyzed by phase contrast
			 microscopy using the most current National Institute for Occupational Safety
			 and Health (NIOSH) method 7400, to show that the concentration of fibers for
			 each of the five samples is less than or equal to a limit of quantitation for
			 PCM (0.010 fibers per cubic centimeter (0.010 f/cm3)
			 of air).