NYC-WTC_000211016

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan June 1 1, 2002 Indoor Air Quality Assessment Page 4 P. S. 89M ATC Project No. 15-19125-0297

* The measurements made during this assessment w'ere instantaneous readings, the NPA AQS is a 24-hour average.

TVOC Concentrations

TVOCs were not detected anyw'here inside the building (0.0 ppm). The outdoor TVOC concentration was also 0.0 ppm.

OBSERVATIONS

During this assessment, ATC noted the following: • The school building was occupied at the time of the assessment. • No smoke odor was detected in the building • The interior of the building appeared clean and free of dust and debris.

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. Thirteen (13) of the indoor measurements for temperature were below the range of 73 to 79°F (at 50 percent relative humidity) as recommended by the 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. All of the indoor measurements for PM2.5 were below the NPAAQS of 65 pg/m^ 24-hour a verage concentration of particulate matter 2.5 micrometers or less in aerodynamic diameter and the USEPA recommended concentration of 40 pg/m^ for sensitive individuals and children. 5. Three (3) 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, ext 211 or 212.

Sincerely, Reviewed by,;__ zl TC ASSOC/A TES JNC.

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

CITY_21MC100_0 02863357

NYC-WTC_000211019