NYC 9/11 Public Portal Document
ALl'
ENVIRONMENTAL
INCORPORATED The Fist Choice jiir Environmental Testing & Consulting
January I . 2002
Gateway Plaza Management Corporation
South End Avenue
New York New York 1028(
Subject Random Air Sampling-Ambient Air Monttonng Gateway Plaza Buildings
Sampling Date(s) January 2. 4 K. `( 10. I I I4 1 S I o
Gentlemen
in the 100.
Enclosed. please Lind the report for air monitonne performed at the above referenced address
Transmission Electron Mtcroscop~
200, 300. 400 and 500 buildings. Air sampling was conducted via
(TEM) analysis at the request of the owner
Electron M.icroscop~
A T C Associates (CLAP p1()879) analyzed the samples using the Transmission
achieved the criteria heloic <70
(TEM) Methodology The results indicated that the areas acceptance
(Please See Attached TEM Reponi
structures per mm2 set by the federal re2ulations
%urroun(itn,, :irc'a . .
According to the EPA. 'in evaivatin data ;rum the t1 arid trade (enter and the
Ashestos Hazard r_mersenci Response 4i i ;II es aivatr
t.s using a protective standard under ,1tlER,-1 the
Th1S t'ert Ctringeni standard that i' used to
Inc risk tram a.snesoio. :n the outdoor and indoor air is a
:shoal Ater asnestoss has heen removed or ahateci it
determine whether chiidren mai re - eater a building
long-term exposure t.i'.-I has chosen to use this standard. hecauce it is the
is based on assumptions at
though it that the public will he exposed to asbestos front
most stringent and protective even i.s uniikeiv
the World Trade , 'enter site for extended periods of time
equipment through which air in the
T:: determine asbestos levels, air filters are collected from monitoring
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 -0 or fewer structures per
sauare ,o::llimeter before children are allowed inside.
Occupational Safer' and Health
There is also a federal standard for asbestos exposure under OSfL-1, the
.-1 ct which is used to protect workers on-the-job The standard is 1 fiber per cubic centimeter averaged
over an eight-hour day To he as protective as possible. EPA is using the school re-entry standard in tests
around the World Trade ('enter
health threat .-Isheslos
Levels above '0 structures per square millimeter do .S'O'T imply an immediate
of asbestos fibers are inhaled over a long
exposure becomes a health concern when high concentrations
period. Illness is ven' unlikely to result from a .angle, high-level exposure, or from a short period of
exposure to lower levels
Yakhva Ben•avuses
The air samples were collected by Alvin B Blake (Certificate #.AH 01-03528) and
(Certificate #AH - -21 1911 NY State Department of Labor Project Monitors
Sincerel} ^
1
I i 11 l~
Michael Larntnas
ALC Enironmentat incorporated
115 West 30th Street * 1 1 th Floor * New York. Nrw York 10001 y 21 2.274. 1001 888.4((s. 3(,20 , Fax: 2 ) 2.270.h 7 47
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ENTERED iii ii ;\I ( i iniiIlrimi'ntaI Ioin
NYC-WTC 000121287
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