NYC-WTC_000233286

NYC 9/11 Public Portal Document

contractor’s supervisor in the daily project log. Inspection, necessary repairs and documenting is required daily, including days when no Phase I IB or I IC work or support activities are scheduled. (ix) A four (4) foot high construction fence with appropriate signage in compliance with Section 7.4(c) shall be constructed at a minimum of ten (10) feet from the end of the exhaust duct tube, or bank of duct tubes, to surround and control this area from public access. (11) Exhaust Location. The exhaust shall be vented to the outside of the building or structure, to a controllable area away from public access. Each negative pressure ventilation unit exhaust duct shall not terminate less than fifteen (15) feet from a receptor or adversely affect the air intake of any building or structure. If the exhaust duct termination location for this Section cannot be met due to allowable space restrictions or the regulated abatement work area being located above the ground floor, the exhaust shall terminate at the exterior of the building or structure, and all receptors less then fifteen (15) feet from the exterior exhaust duct termination location shall be plasticized with two (2) layers of at least 6 mil polyethylene. Exhaust tubes may be grouped together in banks of no more than five (5) tubes, with each tube exhausting separately and the bank of tubes terminating together at the same controlled area. (i) Exception. HEPA-filtered vacuums used to exhaust Minor size tent enclosure regulated abatement work areas do not require exhausting to the exterior of the building/structure. (12) Booster Exhaust Fan Units. If exhaust ducting in excess of 25 feet in length is attached to any ventilation unit, an unfiltered booster fan of equal flow capacity shall be installed per 25 foot of downstream exhaust ducting from the ventilation unit. Non-collapsible exhaust ducting shall be used between the booster fan units and also between the ventilation units and the booster fan units. Where possible, these booster fan units shall be installed and operated outside of the regulated abatement work area. However, booster fan units installed and operated outside the regulated abatement work area still require installation using GFCI protected temporary power circuits. The power circuit for each booster fan shall be installed to disconnect automatically if upstream HEPA filtered ventilation unit shuts down. (b) Exemption From Ventilation And Use of Negative Pressure Equipment. (1) The use of negative pressure air equipment is not required for the following: (i) OSHA Class II non-friable ACM exterior projects; (ii) asbestos projects where enclosures (i.e. hard walls, tents, etc.) are not required by this Part; (iii) demolition asbestos abatement projects.

12 NYCRR56 Subpart?, Page 63

CITY_21MC100_0 03235083

NYC-WTC_000233349