NYC-WTC_000214406

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan June 13,2002 Indoor Air Quality Assessment Page 4 P. S. 150M ATC Project No, 15-19125-0289 * 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:

I. Concentrations of CO, and TVOCs were within applicable standards and guidelines. 2. One (1) of die indoor temperature measurements was below and five (5) of the indoor temperature measurements were above the range of 73 to 79°F (at 50 percent relative humidity) as recommended by the ASHRAE Standard 55-1992 during the mechanical cooling season (summertime conditions). 3. All of the indoor relative humidity measurements were within the ASHRAE-recomraended range of 30 to 60 percent for occupant comfort. 4. One (1) of the CO2 measurements was above he ASHRAE Standard 62-1999 recommended maximum concentration of <700 ppm above the background level. 5. Four (4) of the indoor respirable particulate measurements were above the USEPA recommendation of 40pg/m^ for sensitive individuals and children.

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 21101212.

Sincerely, Reviewed byr / ATCASSOCIATES INC.

James R. Cohn, CIH, CSP Senior Project Manager Regional Manager Industrial Hygiene Division Attachment

CITY_21MC100_002870748

NYC-WTC_000214409