Indoor Air Quality Report, P.S. 150M, Apr 2002

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan April 11,2002 Indoor Air Quality Assessment Page 4 P. S. 150M ATC Project No. 15-19125-0289 above the NPAAQS of 65 pg/m^ 24-hour average concentration of particulate matter 2.5 micrometers or less in aerodynamic diameter and the USEPA recommended concentration of 40 pg/m3 for sensitive individuals and children.

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

TVOC Concentrations

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: • There was construction work going on in the plaza; • The school building was occupied at the time of the assessment; • No smoke odor was detected in the building;

FINDINGS

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

1. Concentrations of CO, CO2 and TVOCs were below the applicable standards and guidelines; 2. None of the indoor or outdoor PM2.5 measurements were above the NPAAQS of 65 pg/m^ or above the USEPA recommended PM2.5 concentration of 40 pg/m^ for sensitive individuals and children. 3. All indoor temperature measurements were within the range of 68 to 75® F (at 50 percent relative humidity) recommended by ASHRAE Standard 55-1992 during the heating season (wintertime conditions). 4. All indoor measurements of relative humidity were within the ASHRAE recommended range of 30 to 60 percent for occupant comfort.

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 211 or 212.

Sincerely, Reviewed by: TC ASSOCIA TES INC.

<mel Javm James R. Cohn, CIH, CSP Senior Proiact Manager Regional Manager Industrial Hygiene Division Attachment

CONFIDENTIAL, CITY_21MC100_005759536 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177937