Forwarding WTC air monitoring scope for final review, Aug 2002

NYC 9/11 Public Portal Document

Environmental Protection Agency §763.90 Isolation is not necessary to protect (i) Completion of response actions. (1) human health and the environment. At the conclusion of any action to re­ (2) Remove the material in the func­ move, encapsulate, or enclose ACBM or tional space or. depending upon wheth­ material assumed to be ACBM, a per­ er enclosure or encapsulation would be son designated by the local education sufficient to protect human health and agency shall visually inspect each the environment, enclose or encap­ functioned space where such action was sulate. conducted to determine whether the (e) If any friable surfacing ACM, action has been properly completed. thermal system insulation ACM, or fri­ (2) (1) A person designated by the local able miscellaneous ACM that has po­ education agency shall collect air sam­ tential for damage is present in a ples using aggressive sampling as de­ building, the local education agency scribed in appendix A to this subpart E shall at least Implement an operations to monitor air for clearance after each and maintenance (O&M) program, as removal, encapsulation, and enclosure described under §763.91, project Involving ACBM, except for (f) If any friable surfacing ACM, ther­ projects that are of small-scale, short- mal system insulation ACM, or friable duration, (11) Local education agencies shall miscellaneous ACM that has potential have air samples collected under this for significant damage is present in a section analyzed for asbestos using lab­ building, the local education agency oratories accredited by the National shall: Bureau of Standards to conduct such (1) Implement an O&M program, as analysis using transmission electron described under §763.91. microscopy (TEM) or, under cir­ (2) Institute preventive measures ap­ cumstances permitted in this section, propriate to eliminate the reasonable laboratories enrolled in the American likelihood that the ACM or its covering Industrial Hygiene Association Pro­ will become significantly damaged, de­ ficiency Analytical Testing Program teriorated, or delaminated. for phase contrast microscopy (PCM). (3) Remove the material as soon as (ill) Until the National Bureau of possible if appropriate preventive Standards TEM laboratory accredita­ measures cannot be effectively imple­ tion progreim is operational, local edu­ mented, or unless other response ac­ cational agencies shall use laboratories tions 2ire determined to protect human that use the protocol described in ap­ health and the environment. Imme­ pendix A to subpart E of this part. diately isolate the area and restrict ac­ (3) Except as provided in paragraphs cess if necessary to avoid an imminent (1)(4), and (i)(5), of this section, an ac­ and substantial endangerment to tion to remove, encapsulate, or enclose human health or the environment. ACBM shall be considered complete (g) Response actions including re­ when the average concentration of as­ moval, encapsulation, enclosure, or re­ bestos of five air samples collected pair, other than small-scale, short-du­ within the affected functional space ration repairs, shall be designed and and analyzed by the TEM method In conducted by persons accredited to de­ appendix A of this subpart E, is not sign and conduct response actions. statistically significantly different, as (h) The requirements of this subpart determined by the Z-test calculation E in no way supersede the worker pro­ found in appendix A of this subpart E, tection and work practice require­ from the average asbestos concentra­ ments under 29 CFR 1926.58 (Occupa­ tion of five air samples collected at the tional Safety and Health Administra­ same time outside the affected func­ tion (OSHA) asbestos worker protec­ tional space and analyzed in the same tion standards for construction), 40 manner, and the average asbestos con­ CFR part 763, subpart G (EPA asbestos centration of the three field blanks de­ worker protection standards for public scribed in appendix A of this subpart E employees), and 40 CFR part 61, sub­ is below the filter background level, as part M (National Emission Standards defined In appendix A of this subpart E, for Hazardous Air Pollutants—Asbes­ of 70 structures per square millimeter tos). (70 s/mm^).

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