NYC-WTC_000210694

NYC 9/11 Public Portal Document

ait ENVIKOi INCORPORATED TAL

November 30, 2001 The First Choice lor Environmental Testing & Consulting

Gateway Plaza Management Corporation 375 South End Avenue New York, New York 10280

Subject Random An Sampling-Ambient Air .Monitoring Gateway Plaza Buildings Sampling Date(s) 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 (TEM) analysis at the request of the owner

ATC Associates (ELAP #10879) analyzed the samples usmg the Transmission Electron .Microscopy (TE,M) Methodology The results indicated that the areas achieved the acceptance criteria below <70 structures per mm2 set bv the federal regulations (Please See Attached TEM Report) According to the EPA, "In evaluating data from the World Trade Center and the surrounding areas EP-I IS using a protective standard under AHERA. the Asbestos Hazard Emergency Response -ict to evaluate the risk from asbestos tn the outdoor and indoor air This is a very stringent standard that is used to determine whether children may re-enter a school building after asbestos has been removed or abated II is based on assumptions of long-term exposure EP.4 has chosen to use this standard, because it is the most stringent and protective, even though it is unlikely that the public will be exposed to asbestos from the World Trade Center site for extended periods of time

To determine asbestos levels, air filters are collectedfiom 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 standardfor asbestos exposure under OSHA, the Occupational Safety and Health Act. which IS used to protect workers on-the-job The standard is . I 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 fVorld Trade Center

Levels above 70 structures per square millimeter do HOT 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 Amenco Rodnguez Jr ((License #AH 89-07160)) NY State Department of Labor Project Monitor,

Sincei

J^hira Sarett \Ld Environmental Incorporated

1 15 West 30th Street • 1 1th Floor • New York New York 10001 • 212 276 1001 • 888 466 5620 • Fax 212 279 6747 Home Dllicc The Bellevue • iuiie oOO • 200 b Broad Mreei • Philadelphia PA 10102 • 215 '52^1400 « SHH'HO,4178 • Fax 215'52 0550

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NYC-WTC_000210694