NYC-WTC_000233286

NYC 9/11 Public Portal Document

56-4.9 Number and Location of Samples Required. The amount of ACM, PACM or asbestos material to be abated within the regulated abatement work area determines the asbestos project air sampling requirements for that specific regulated abatement work area.

(a) Phase I B Background Pre-Abatement Air Samples. Required for Large and Small asbestos projects. (See Table 2 and Subpart 56-6)

(b) Phase II A Regulated Abatement Work Area Preparation Air Samples. Required for Large asbestos projects with OSHA Class I or OSHA Class II friable ACM subject to handling/abatement. (See Table 2 and Subpart 56-7)

(c) Phase II B Asbestos Handling Air Samples. Required for Large asbestos projects. (See Table 2 and Subpart 56-8)

(d) Phase II C Final Cleaning & Clearance Air Samples. Required for Large, Small and some Minor asbestos projects. (See Table 2 and Subpart 56-9)

56-4.10 Work Stoppage Criteria During Phase II A through II C. If air samples collected outside the regulated abatement work area indicate airborne fiber concentrations at or above 0.01 fibers per cubic centimeter, or the established background level, whichever is greater, work shall stop immediately for inspection and repair of barriers and negative air ventilation systems as necessary. Clean up of surfaces outside of the regulated abatement work area using HEPA-vacuums and wet­ cleaning methods shall be performed prior to resumption of preparation, abatement or cleaning activities. A summary of clean up activities and the results of barrier inspections including any necessary repairs, shall be documented in the supervisor’s daily project log. Work methods shall be altered accordingly to reduce fiber concentrations to acceptable levels.

(a) Submission of Elevated Air Sample Results Collected During Phase II A through II C. The air sampling asbestos contractor shall submit to the Commissioner, all PCM air sample results for air samples collected during Phase II A through II C along with background results, if they are greater than or equal to 0.01 fibers per cubic centimeter or the established background level, whichever is greater. Upon receipt of elevated air sample results, the air sample results shall be submitted immediately, within the same business day, to the Commissioner in care of the appropriate district office of the Asbestos Control Bureau, where the project takes place.

56-4.11 Phase II C Satisfactory Clearance Air Sample Results Criteria.

(a) PCM Clearance Criteria. The PCM clearance air sample results shall be considered satisfactory when every clearance air sample demonstrates an airborne concentration of fibers of less than 0.01 fibers per cubic centimeter, or the established background level(s), whichever is greater.

12 NYCRR56 Subpart 4, Page 38

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NYC-WTC_000233324