NYC-WTC_000211004

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan June 4, 2002 Indoor Air Quality Assessment Page 4 P. S. 89M ATC Project No. 15-19125-0297 respirable particulate concentration measurements ranged between 11 pg/m^ pg/m-^ for all readings with an average of 14 pg/m^.

* The measurements made during this assessment were instantaneous readings, the NPAAQS is a 24-hour average.

rVOC 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 tn 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. Thirty- eight (38) of the indoor measurements for temperature were below and none of the 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 summer season. 3. Thirty-four (34) of the indoor measurements for relative humidity were bellow and none of the readings were above the ASHRAE-recommended range of 30 to 60 percent for occupant comfort. 4. Based on the field data collected the highest reading was recorded in room 528 at 10:10 AM with 29 occupants. 5. All of the indoor measurements for PM2.5 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, .1TC ASSOCIA TES INC.

Prasad Doddapaneni I Senior Project Manager

Attachment

CITY_21MC100_0 02863292

NYC-WTC_000211007