NYC-WTC_000233286

NYC 9/11 Public Portal Document

SUBPART 56-7 PHASE II A : WORK AREA PREPARATION

56-7.1 Air Sampling Requirements. (a) Personal Air Sampling. Air sampling shall be performed in the worker’s breathing zone, by the asbestos contractor for his personnel, as required by current OSHA regulations.

(b) Daily Air Sampling. Project air sampling shall be conducted daily for the full workshift, for all Large size projects with OSHA Class I or OSHA Class II friable ACM subject to handling/abatement. (See Table 2 within Section 56-4.9) If more than one daily workshift is required to accomplish the work, air sampling shall be performed on each workshift. Air sampling is not required on days when there are no Phase II A activities.

(c) Number And Location Of Samples - Large Asbestos Projects. A minimum of five (5) samples shall be taken on a daily basis. The location of samples to be taken are as follows:

(1) A minimum of two (2) samples shall be taken outside the regulated abatement work area, within ten (10) feet of the isolation or critical barriers. When positive pressurized HVAC ducts are located within the regulated abatement work area, one of these samples shall be collected within ten (10) feet of an HVAC diffuser, at the downstream side of the positive pressurized HVAC ducts, in adjoining non-work areas. Where the entire building/structure is the regulated abatement work area, an additional exterior ambient air sample, remote from that in Paragraph (3) of this Subdivision below shall be taken.

(2) A minimum of one (1) sample shall be taken outside the regulated abatement work area, within ten (10) feet of and within proximity to each entrance or exit from the regulated abatement work area.

(3) One (1) ambient air sample shall be taken outside the building or structure within twenty-five (25) feet of the building or structure.

(4) Once the negative air systems have been established, one (1) sample shall be taken in front of and within ten (10) feet of each unobstructed, negative pressure ventilation equipment exhaust or bank (grouping of not more than five (5) exhaust ports at one termination area) of exhausts but not within a duct itself.

(5) Once the negative air systems have been established, where negative ventilation unit exhaust ducts run through the non-work area portions of building or structure to access the exterior, one (1) sample shall be

12 NYCRR56 Subpart?, Page 48

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