NYC-WTC_000233286

NYC 9/11 Public Portal Document

(i) Pre-Sampling Agitation. Before starting the air sampling pumps, the exhaust of forced air equipment shall be directed against all walls, ceilings, floors, ledges, and other surfaces in the rooms. This shall continue for at least five (5) minutes per 1,000 square feet of floor space. (ii) Ongoing Agitation. At least a 20-inch fan shall be placed in the center of each room. One fan per 10,000 cubic feet of room space shall be used. The fan shall be operated on slow speed and pointed toward the ceiling. (iii) Begin Sampling. The sampling pumps shall then be turned on. (iv) End Sampling. When sampling has been completed, the sampling pump shall be turned off first, followed by the fan. (2) Number and Location of Samples - Large Project. A minimum of ten (10) area samples shall be taken. Five (5) samples shall be taken inside the regulated abatement work area and five (5) samples shall be taken outside of the regulated abatement work area within the building or structure in uncontaminated areas that are within ten (10) feet of the isolation barriers. One additional inside sample shall be required for every 5,000 sq. ft. above 25,000 sq. ft. of floor space within the regulated abatement work area. If the entire building/structure is the regulated abatement work area, the five (5) area samples outside the regulated abatement work area shall be eliminated and one (1) sample shall be collected outside the building/structure within ten (10) feet of isolation barriers. (3) Number and Location of Samples - Small Project. A minimum of six (6) samples shall be taken. Three (3) samples shall be taken inside the regulated abatement work area and three (3) samples shall be taken outside of the regulated abatement work area, within the building or structure, in the uncontaminated areas within ten (10) feet of the isolation barriers. If the entire building/structure is the regulated abatement work area, the three (3) area samples outside the regulated abatement work area shall be eliminated and one (1) sample shall be collected outside the building/structure within ten (10) feet of the isolation barriers. (4) Number And Location Of Samples - Minor Asbestos Projects & Minor Size Regulated Abatement Work Areas. For a Minor asbestos project, air samples are not required unless the glove bag or tent fails or if it is an incidental disturbance asbestos project, in which case the following sampling will be required. Also, if a minor size regulated abatement work area is part of a small or large asbestos project, the following sampling will be required per minor size regulated abatement work area. (i) Clearance Air Sampling. A minimum of two (2) samples shall be collected. One (1) sample shall be collected inside the regulated abatement work area and one (1) sample shall be collected outside

12 NYCRR56 Subpart 9, Page 89

CITY_21MC100_0 03235109

NYC-WTC_000233375