NYC 9/11 Public Portal Document
1
ENVIRONMENTAL
INCORPORA TED The Fist Choice for Env ironmentul Testing & Consulting
November 30. 2001
Gateway Plaza Management Corporation
375 South End Avenue
New York, New York 10280
Subject: Random Air Sampling-Ambient Air Monitoring Gateway Plaza Buildings
Sampling Date Si: November 19. 20. 21 . 26, 27, & 28
Gentlemen:
Please find enclosed the air monitoring report performed at the above referenced address in the 100, 200,
300, 400 & 500 Air sampling was conducted via Transmission Electron Microscopy iT'EMl analysis at the
request of the owner
ATC Associates (FLAP #10879) analyzed the samples using the Transmission Electron Microscopy (TLM)
Methodology. The results indicated that the areas achieved the acceptance criteria below <70
structures per mm2 set by the federal regulations. (Please See Attached TEM Report)
According to the EPA, "In evaluating data from the World Truthe ('enter and the surroundtni; areas. 1-PA
is using a protective standard under AHERA. the Asbestos Hazard Emergence Response .'let, to evaluate
the risk from asbestos in the outdoor and indoor air This is a very' stringent standard that is used to
determine whether children may re-enter a school building alter asbestos has been removed or abated It vs
based on assumptions of long-terns exposure. EPA has chosen to use this standard, because it is the most
stringent and protective, even though it o unlikely that the public will he exposed to asbestos from the
World Trade Center site for extended periods of time.
To determine asbestos levels, air filters are collected from monitoring equipment through which air in the
school building has passed and viewed through a microscope. The number of structures - material that has
asbestos fibers on or in it - is then counted. The measurements must be 70 or fewer structures per square
millimeter before children are allowed inside.
There is also a federal standard for asbestos exposure under OSHA, the Occupational Safety and Health
Act, which is used to protect workers on-the-job. The standard is . l fiber per cubic centimeter averaged
over an eight-hour day. To be as protective as possible, EPA is using the school re-entry standard in tests
around the World Trade Center.
Levels above 70 structures per square millimeter do NOT imply an immediate health threat. Asbestos
exposure becomes a health concern when high concentrations of asbestos fibers are inhaled over a long
period. Illness is very unlikely to result from a single, high-level exposure, or from a short period of
exposure to lower levels. "
The air samples were collected by Americo Rodriguez Jr. ((License #AH 89-07160)) NY State Department
of Labor Project Monitor.
Sincer
J sh a Sarett
L Environmental Incorporated
1 1 5 \Vest 30th Street • 1 I th Floor • New York. 'a c s. York 10001 • 2 1 2 2 1) 1001 • 888 406 3620 • Fax. 2 1 2 27 6747
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