NYC-WTC_000220664

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan April 24, 2002 Indoor Air Quality Assessment Page 4 P. S. 89M ATC Project No. 15-19125-0297

* 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: • 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 CO2, CO, and TVOCs were below applicable standards and guidelines. 2. All 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. Sixty (60) of the indoor measurements for relative humidity were below and ten (10) measurements were within the ASHRAE-recommended range of 30 to 60 percent for occupant comfort. 4. All of the indoor and outdoor measurements were below the NPAAQS of 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/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 211 or212.

Sincerely, ATC ASSOCIATES INC. Reviewed by:

James R. Cohn, CIH, CSP (ject Manager Regional Manager, Industrial Hygiene Division

Attachment

CITY_21MC100_002886658

NYC-WTC_000220667