NYC-WTC_000187685

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan March 14, 2002 Indoo- Air Quality Assessment Page 4 P. S. 150M ATC Project No. 15-19125-0289

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

Tl'OC Concentj^ions

TVOCs W'ere 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 not 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:

I. Concentrations of CO, CO2 and TVOCs were within applicable standards and guidelines; 2. None of the indoor PM;?.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. All of the outdoor PM2.5 measurements were below' the NPAAQS of 65 pg^m- but above the USEPA recommended PM2 5 concentration of 40 pg/m^ for sensitive individuals and children. 3. Eighteen (18) of the temperature measurements were above the range of 68 to 75o F (at 50 percent relative humidity) recommended by ASHRAE Standard 55-1992 during the heating season (wintertime conditions). 4. All measurements of relative humidity w ere w'ithin the ASHRAE recommended range of 30 10 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, e.xtension 211 or 212.

Sincerely, Reviewed by: A TC ASSOCIA TES INC. ? f ■ Yiannis Efstathiou James R. Cohn, CIH, CSP Project Manager Regional Manager Industrial Hy giene Division Attachment

CITY_21MC100_002954282

NYC-WTC_000187688