NYC 9/11 Public Portal Document
9. Negative pressure ventilation equipment shall be installed and operated during all cleaning
activities. Equipment shall run continuously until clearance air monitoring. A minimum of one
air change every 15 minutes shall be provided. When ducting to the outside is not possible, a
second negative pressure ventilation unit compatible with the primary unit may be connected
in series.
10. All WTC debris shall be misted and double-bagged. Accumulation ofwater is prohibited. Water
misting shall be sufficient to wet the material without water accumulations.
11. After the removal of debris, all surfaces will be cleaned in accordance with the procedures
specified in Scope A. After all surfaces have been cleaned, a second cleaning shall be
performed. This results in two full cleanings of all surfaces, with the following exception.
Water extraction cleaning of carpets and fabric covered furniture will be conducted only once.
Surfaces include but are not limited to walls, floors, ceilings, ledges, trims, appliances,
equipment and furnishings.
Residents may identify and tag certain furnishings (e.g. carpets and fabric covered furniture) for
disposal rather than cleaning. Disposal of residents’ personal property shall not occur without
prior written authorization by the owner.
Disposal ofall wastes generated during the cleaning shall be the responsibility ofthe contractor.
All waste generated shall be treated as asbestos-containing material (ACM). Transportation and
disposal of generated waste shall be in compliance with all applicable rules and regulations.
A Cleaning Checklist (to be developed by EPA) will be completed by the cleaning contractor
as tasks are completed to document the progress of the cleaning.
An activity log will be maintained by the site supervisor.
The cleaning contractor shall notify the monitoring contractor immediately upon completion
of the cleaning. The Monitoring Contractor will conduct a thorough visual inspection to verify
the absence of visible dust accumulations. If dust is observed, the cleaning contractor will
reclean as necessary at no additional cost.
Air sampling shall be performed by the Monitoring Contractor after the area is free of dust
accumulations as determined by the Monitoring Contractor. The residence will be recleaned
and retested if the clean-up criteria of 0.0009 fibers/cc (PCME measured by TEM) is not
achieved or if determined necessary by EPA. This clean-up criterion may be reevaluated and
revised, if determined necessary based on field conditions and analytical limitations.
After successful clearance air monitoring, isolation barriers shall be removed in conjunction with
the use of a HEPA vacuum.
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NYC-WTC_000139051
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