NYC 9/11 Public Portal Document
cleaned subsequent to September 11, 2001 (if yes, then when and by whom) and if the
HVAC system requires cleaning. This information shall be provided via F2L or an
agreed upon alternative electronic format or website approved by EPA within 24 hours of
activity.
7. HVAC systems that have been impacted by dust or debris from the collapse of the World
Trade Center will be cleaned. In the event that a HVAC system for an entire building
requires cleaning, a separate, site specific contract will be awarded by DEP for this work.
If only a portion of a HVAC system requires cleaning, then the Cleaning Contractor will
conduct the cleaning utilizing specialized labor trained and experienced in duct cleaning.
a. The monitoring contractor shall schedule and oversee the cleaning of HVAC
systCTis.
b. The Monitoring Contractor shall inspect HVAC systems or portions thereof
cleaned to verify cleanliness. If visible dust or other contaminants are evident
through visual inspection or testing, then the Monitoring Contractor will direct the
HVAC Cleaning Contractor to reclean those portions of the system where dust or
other contaminants are present and reinspect.
c. HVAC cleaning, and cleanliness inspections shall be conducted in accordance
with the National Air Duct Cleaners Association (NADCA) General
Specification for the Cleaning of Commercial Heating, Ventilating and Air
Conditioning Systems and the NADCA Assessment, Cleaning and Restoration
Standard (ACR 2002).
8. Sampling of residences and common spaces where cleaning has not been requested
a. Based on consultation with resident, aggressive or modified aggressive air
sampling will be conducted.
i. Before beginning aggressive air sampling, a 1 horsepower electric leaf
blower shall be used to direct exhaust air against walls, ceilings, floors and
other surfaces. This shall continue for at least five minutes per 1,000
square feet of floor. When directing the exhaust, caution shall be taken to
minimize disturbance and potential damage to furnishings and personal
belongings
ii. Residents shall not be present in their residence during
aggressive air sampling activities.
iii. Personal protective equipment including disposable clothing, gloves, and
respirators shall be worn during aggressive air sampling activities.
iv. HVAC systems shall be shut down or isolated locally during aggressive
air sampling.
V. Room and window air conditioners shall not be operated during aggressive
air sampling.
vi. Leaf blowers shall not be employed for modified aggressive air sampling.
vii. All other procedures are identical for aggressive and modified aggressive
air sampling, unless otherwise noted.
b. At least one 20-inch fan shall be placed in the center of each room
sampled. One fan per 10; cubic feet of room space shall be used. The
fans shall be operated on slow speed and pointed toward the ceiling. The
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NYC-WTC_000163335
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