New York Codes, Rules and Regulations › Title 12 - DEPARTMENT OF LABOR › Chapter I - Industrial Board Of Appeals › Subchapter A - The Industrial Code › Part 56 - Asbestos › Subpart 56-7 - Phase Ii A: Work Area Preparation › Section 56-7.8 - Engineering controls

Current through Register Vol. 46, No. 28, July 10, 2024
(a)
					 Negative air pressure equipment. All OSHA Class I, Class III, and interior
					 Class II asbestos abatement projects shall employ negative air pressure
					 equipment ventilation.
(1) Operation. The
					 negative air pressure equipment shall operate continuously, 24 hours a day,
					 from startup of negative air pressure equipment, through the cleanup operations
					 and satisfactory clearance air sampling results being obtained, or the asbestos
					 project is complete.
(2) Timing of
					 installation. The negative air ventilation units shall be installed and made
					 operational after the critical barriers and isolation barriers are
					 installed.
(3) Negative air
					 pressure. A negative air pressure, relative to areas outside of the enclosure,
					 shall be maintained at all times in the regulated abatement work area during
					 the asbestos abatement project to ensure that contaminated air in the regulated
					 abatement work area does not escape back to an uncontaminated area.
(4) Manometer. A manometer shall be used to
					 document the pressure differential for all OSHA Class I large and small size
					 asbestos project regulated abatement work areas. A minimum of -0.02 column inch
					 of water pressure differential, relative to pressure outside the regulated
					 abatement work area, shall be maintained within the regulated abatement work
					 area, as evidenced by manometric measurements. Once installed, on a daily basis
					 at least twice per workshift, the asbestos abatement contractor's supervisor
					 shall document the manometer reading within the daily project log. The
					 manometer shall be installed and made operational once the negative air has
					 been established in the regulated abatement work area. Magnahelic manometers
					 shall be at a minimum calibrated semi-annually, and a copy of the current
					 calibration certification shall be posted at the work site during Phase II
					 operations.
(5) Ventilation units.
					 If more than one primary HEPA-filtered ventilation unit is installed, the units
					 shall be turned on one at a time and the integrity of temporary hardwall
					 isolation barriers checked for secure attachment or the need for additional
					 reinforcement shall be checked. A minimum of one additional unit having a
					 capacity of at least equal to that of the primary unit shall be installed, as a
					 backup unit to be used upon primary unit failure, or if necessary during
					 primary unit filter changes. Ventilation unit exhaust ducting shall not exceed
					 25 feet in length, due to reduction in volumetric flow rates caused by
					 friction.
(6) Power supply. A GFCI
					 protected temporary power supply shall be available to satisfy the requirements
					 of the total of all ventilation units.
(7) Power failure. In the event of electric
					 power supply failure, abatement shall stop immediately and shall not resume
					 until power is restored and exhaust units are operating fully. In the event of
					 extended power failure (longer than one hour), after evacuation of all persons
					 from the regulated abatement work area, the decontamination system enclosure
					 facilities shall be sealed airtight.
(8) Air changes. Negative air pressure
					 ventilation equipment shall be installed and operated continuously to provide
					 at least four air changes in the regulated abatement work area every hour
					 including during clearance air sampling.
(9) Openings in enclosure. Openings made in
					 the enclosure system to accommodate these units shall be made airtight with
					 duct tape or caulking or both. Where possible, the intake side of the negative
					 air ventilation unit shall remain within the regulated abatement work area to
					 permit filter changing, while minimizing equipment contamination and the
					 likelihood of contamination of non-work areas.
(10) Installation and care. Proper
					 installation procedures, including use of appropriate filters and
					 manufacturer's recommended operating procedures shall be followed.
(i) Each HEPA filter should be individually
					 tested and certified by the manufacturer to have an efficiency of not less than
					 99.97 percent when challenged with 0.3 micron particles. Testing shall be in
					 accordance with accepted methodologies, and each filter should bear an
					 appropriate UL label to indicate ability to perform under specified
					 conditions.
(ii) Negative pressure
					 HEPA-filtered ventilation units shall be exhausted to the outside of the
					 building or structure and away from public access and to a controllable
					 area.
(iii) Air sampling at exhaust
					 duct termination locations and daily inspections shall be conducted to insure
					 that procedures are followed to maintain the negative pressure air ventilation
					 filtration systems.
(iv)
					 Pre-filters, secondary filters and HEPA-filters shall be replaced when
					 dirty.
(v) Ducts of at least
					 equivalent shape and dimension as those of the negative pressure ventilation
					 exhaust shall be used to exhaust to the outside of the building or
					 structure.
(vi) All fans, ducts and
					 joints shall be sealed, braced and supported to maintain an airtight
					 system.
(vii) Once installed and
					 operational, daily inspections shall be conducted to insure the airtight
					 integrity of the system, and the findings shall be documented by the asbestos
					 abatement contractor's supervisor in the daily project log. Inspection,
					 necessary repairs and documenting is required daily, including days when no
					 Phase II B or 11 C work or support activities are scheduled.
(viii) A four-foot high construction fence
					 with appropriate signage in compliance with section
					 56-7.4(c) 
					 of this Subpart shall be constructed at a minimum of 10 feet from the end of
					 the exhaust duct tube, or bank of duct tubes, to surround and control this area
					 from public access. For ground level exhaust duct terminations at the immediate
					 exterior of the building/structure, the fence shall be installed at the tube
					 discharge location.
(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 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 15 feet from
					 the exterior exhaust duct termination location shall be plasticized with two
					 layers of at least six mil polyethylene. Exhaust tubes may be grouped together
					 in banks of no more than five 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.