NYC-WTC_000199225

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan June 14, 2002 Indoor Air Quality Assessment Page 4 P. S. 234M ATC Project No, 15-19125-0279

* 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 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 and TVOCs were below applicable standards and guidelines. 2. Twelve (12) of the indoor measurements for temperature were below 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 ASHRAE- recommended range of 30 to 60 percent for occupant comfort. 4. None of the indoor respirable particulate measurements were above the USEPA recommended concentration of 40 pg/m^ for sensitive individuals and children. 5. Two of the indoor CO2 measurements were above the ASHRAE Standard 62-1999 recommended maximum concentration of <700 ppm above the background level.

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: A TC ASSOCIA TES INC.

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

CITY_21MC100_003032708

NYC-WTC_000199228