10A NCAC 41C .0607 ASBESTOS EXPOSURE STANDARD FOR PUBLIC AREAS
(a) The maximum allowable ambient asbestos level in the air for public areas shall be:
(1) 0.01 fibers per cubic centimeter as analyzed by phase contrast microscopy, or
(2) arithmetic mean of less than or equal to 70 structures per millimeter square as analyzed by transmission electron microscopy, or
(3) a Z‑Test result that is less than or equal to 1.65 as analyzed by transmission electron microscopy.
(b) For individually permitted asbestos removals, ambient air sampling shall be conducted in public areas adjacent to the work area. Initial sampling shall be conducted on the day that regulated asbestos containing material removal begins. The sampling shall continue on a daily basis unless, or until, the supervising air monitor specifies differently. Potential public asbestos exposure shall be considered when determining the frequency and location of the sampling.
(c) Clearance air sampling shall be conducted in accordance with Paragraphs (d) and (e) of this Rule for all individually permitted asbestos removal projects conducted in public areas. Clearance air samples shall be analyzed by:
(1) transmission electron microscopy and comply with the levels specified under Subparagraph (a)(2) or (a)(3) of this Rule for each individually permitted removal of more than 3000 square feet (281 square meters), 1500 linear feet (462 meters), or 656 cubic feet (18 cubic meters) of regulated asbestos containing material; or
(2) transmission electron microscopy or phase contrast microscopy and comply with the levels specified in Paragraph (a) of this Rule for all other permitted asbestos removals, including asbestos removals exceeding threshold amounts stipulated in Subparagraph (c)(1) of this Rule in buildings scheduled for demolition. Demolition, for the purposes of this Rule, means as defined in Rule .0606(a)(4) of this Section.
(d) Phase contrast microscopy and transmission electron microscopy sampling and analysis methods shall be conducted in accordance with 40 CFR Part 763, Subpart E.
(e) Sample analysis for phase contrast microscopy or transmission electron microscopy samples shall be performed by a laboratory meeting the requirements of P.L. 99‑519 and 40 CFR 763 and accompanying appendices. Laboratories performing phase contrast microscopy analysis pursuant to this Rule shall have a rating of proficient by the American Industrial Hygiene Association's Proficiency Analytical Testing Program. Individuals performing phase contrast microscopy analysis at the asbestos removal location shall be rated proficient in the American Industrial Hygiene Association's Asbestos Analysts Registry Program. If all microscopists in a particular laboratory performing phase contrast microscopy analysis are rated as proficient by the Asbestos Analysts Registry Program, enrollment and proficiency in the Proficiency Analytical Testing Program is not required.
(f) A final visual inspection shall be conducted by an accredited air monitor or an accredited supervising air monitor for all permitted asbestos removals conducted in public areas. This visual inspection shall be conducted prior to clearance air sampling. The final visual inspection shall assure that all asbestos containing residue, dust, and debris and asbestos contaminated equipment has been removed.
(g) Any person performing ambient or clearance air sampling or visual inspection during an asbestos removal as specified under Paragraphs (b), (c), and (f) of this Rule shall be retained by the building owner. Neither the accredited supervising air monitor nor accredited air monitor shall be employed by the contractor hired to conduct the asbestos removal except that:
(1) this restriction in no way applies to personal samples taken to evaluate worker exposure as required by Occupational Safety and Health Act; and
(2) this restriction shall not apply when the contractor and air monitor have disclosed their association to the building owner and the building owner approves this association in writing.
(h) For air sampling and visual inspections conducted under Paragraphs (b), (c), and (f) of this Rule, the supervising air monitor shall:
(1) Prepare, prior to the removal start date, an abatement project monitoring plan which takes into consideration at least the abatement project scope of work, building use, occupant locations and their potential for exposure to airborne asbestos fibers, type of asbestos containing material, and the asbestos abatement design, including work practices and engineering controls. The plan shall include air sampling procedures, air sample locations and air sampling frequency. This sampling plan may be amended by the supervising air monitor as needed. This requirement shall apply to each individually permitted removal of more than 3000 square feet (281 square meters), 1500 linear feet (462 meters), or 656 cubic feet (18 cubic meters) of regulated asbestos containing materials;
(2) Ensure that ambient air sampling results shall be available on‑site:
(A) within 24 hours of sample collection and analysis by phase contrast microscopy;
(B) within 48 hours of sample collection and analysis by transmission electron microscopy;
(3) Personally inspect any individually permitted asbestos removal project:
(A) that exceeds 10 working days in length, but does not exceed 30 working days, at least once; or
(B) that exceeds 30 working days in length, at least once in the first 30 working days and at least once every 30 working days thereafter;
(4) Prepare a written, signed and dated report documenting all site visits made to the removal, final visual inspection, and all ambient and clearance air sampling conducted. This report shall be supplied by the supervising air monitor to the building owner. The building owner shall supply a copy of the report to the Program upon request.
History Note: Temporary Amendment Eff. November 8, 1994 for a period of 180 days or until the permanent rule becomes effective, whichever is sooner;
Temporary Rule Eff. November 1, 1989 for a period of 180 days to expire on April 30, 1990;
Authority G.S. 130A‑5(3); 130A‑446; P.L. 99‑519;
Eff. February 1, 1990;
Amended Eff. July 1, 1996; January 1, 1995; October 1, 1994; August 1, 1991.