NYC-WTC_000226873

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan January 18, 2002 Indoor Air Quality Assessment Page 4 P. S. 89 (Manhattan) ATC ProjectNo. 15-19125-0297 concentration for the entire school building was approximately 29 pg/m^.The outdoor respirable particulate concentration ranged from 41 - 46 pg/m-’.

* The measurements made during this assessment were instantaneous readings, the NPAAQS is a 24-hour average.

TVOC Concentration

TVOCs were not detected anywhere inside the building (0.0 ppm). The outdoor TVOC concentration was also 0.0 ppm.

OBSERVATIONS

During this assessment, ATC noted the following; • The interior of the building appeared clean and free of dust and debris; • The building was not occupied at the time of the assessment; • No smoke odor was detected in the building; • One window on 5^^ floor hallway by staircase #2 was open

FINDINGS

Based on the real-time measurements, the following findings are presented;

1. Concentrations of respirable particulates, CO2, CO and TVOCs were within applicable standards and guidelines; 2. One (1) indoor measurement of relative humidity were within the ASHRAE-recommended range of 30 to 60 percent for occupant comfort. All other measurements were below the ASHRAE-recommended range; 3. Three (3) temperature measurements were above and four (4) were below the range of 68 to 750 F (at 50 percent relative humidity) recommended by ASHRAE Standard 55-1992 during the heating season (wintertime conditions).

It is our pleasure to provide these indoor air quality services to the New York City Board of Education. If you have any questions about this report, please call (212) 353-8280, extension 261 or212.

Sincerely, A TCASSOCIA TES INC. Reviewed by:

Andreas C. Andreou James R. Cohn, CIH, CSP Senior Project Manager Regional Manager Industrial Hygiene Division

Attachment

CITY_21MC100_000490554 NYC-WTC_000226876