NYC 9/11 Public Portal Document
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24,2001
Ms. Carol Ann Albrektsen
90 Broad LLC
90 Broad Street
New York, New York 10004
Re: Indoor Air Quality Investigation
90 Broad Street
New York, New York 10004
Dear Ms. Albrektsen:
within your
This brief report summarizes our evaluation of indoor air quality investigation completed airborne
facility on September 21, 2001. The investigation was focused on monitoring for potential
hazardous materials that may be present within the building after the World Trade Center incident.
products
The primary concern was over the potential presence of airborne asbestos and combustion
from the fire.
Six (6) representative locations were monitored for presence of airborne asbestos fibers. The
attached summary shows the airborne fiber levels to be at 0.001 fibers/cc or below. This airborne
coffin is well below the EPA safdelearance level of 0.01 fibers/ca. Therefore, the airborne
fiber levels do not pose the health risks as identified in this survey during the testing period.
monoxide.
The primary decomposition products of fire monitored were carbon dioxide and carbon
tested
In addition, temperature and humitltity measurements were taken. Twenty three (23) areas were
throughout the building. Carbon dioxide levels were found to be below the EPA recommended
level of 1000 ppm for indoor air quality.• Carbon monoxide concentrations were none detected
in all of the tested locations. Temperature and humidity levels were established to be within
acceptable ranges.
300 GRAND AVENUE, ENGLEWOOD, NEW JERSEY 07631-4355
TEL: (201) 569-6708 FAX: (201) 569-4378 WORLDWIDE WEB: http://www.daienviro.com
E MAIL: [email protected]
EUROPE NORTH AMERICA ASIA
NYC-WTC 000105413
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