NYC-WTC_000212725

NYC 9/11 Public Portal Document

Mr. Bernard I’. Orlan June 5, 2002 Indoor Air Quality Assessment Page 4 P. S. 234M ATC Project No. 15-19125-0279

Tl 'OC Concentration

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

OBSERVATIONS

During this assessment, ATC noted the following: • The 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 CO2, CO, and TVOCs were below applicable standards and guidelines. 2. All of the indoor measurements for temperature were within the range of 73 to 79’F (at 50 percent relative humidity) as recommended by ASHRAE Standard 55-1992 during the summer season. 3. All of the indoor measurements for relative humidity were within the ASIIR.AE- recommended range of 30 to 60 percent for occupant comfort. 4, None of the measurements collected indoors for respirable particulate concentrations were above the NPAAQS 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.

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 01'212.

Sincerely, ATC ASSOCIATES INC.

c- Yiannis Efstathiou Senior Project Manager

Attachment

CITY_21MC100_002852099

NYC-WTC_000212728