NYC-WTC_000220418

NYC 9/11 Public Portal Document 06/14/2002 00:14 FAX 2129434641 @04 J'

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October IO, 2001

Mrs. Teresa Elman The Otto Gerdau Co. 80 Wall Street, PH. New York, NY. .10005

'Re: 80-82 Wall Street Ambient Project #211366

Dear Mrs. Elman The following is a summary of the indoor environmental quality survey that Ambient Group, Inc performed on September 18*. 2001 at the above referenced location The survey included sampling for airborne and settled dust characterization, as well as air monitoring for TEM analysis

Four (4) air samples were collected from various locations on the 12*. 8*, 4* and 2"^ floors and analyzed by transmission electron microscopy (TEM) for asbestos structures. The results of the analysis indicated that airborne asbestos levels at the time of testing were less than the analytical sensitivity of the instrument, as well as well below the EPA standard of 70 strjcturcs^mm^ and other recommended industry guidelines and/or regulations

Four (4) settled dust and four (4) air samples were collected for characterization analysis from various locations on the 12^, 8*, 4* and 2"^ floors. The samples were composed primarily of carbon particles, cement and/or gravel road dust. No asbestos was detected in the eight (8) samples collected. Many of these elements identified in the samples are commonly found in an indoor environment and should not pose any adverse health concerns to the building occupants.

It should be noted that skin fragments, which were also identified in the samples, consist primarily of dead epithelial cells which are constantly shed by humans and are present as a result of the building occupants. Likewise, decayed organic matter typically includes decaying plant material and food particles, and it is not uncommon to find these materials in samples collected from within commercial office buildings-

Anached please find copies of the laboratory reports for further details. Should you have any questions regarding this information, please feel fire to call me.

Sincerely, / Signed for Ambient Grqj4lnnc. by:

William Esposito, CIH President

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CITY_21MC100_002388397

NYC-WTC_000220418