Indoor air quality report, M833 school, June 2002

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan June 10,2002 Indoor Air Quality Assessment Page 4 H.S. of Economics and Finance (M833) ATC Project No. 15-19125-0291 * 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 interior of the building appeared clean and free of dust and debris; • 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. Indoor concentrations of CO and TVOCs were below applicable standards and guidelines. 2. Eleven (11) of the indoor measurements for temperature were above and Eighty three (83) measurement were within the range of 73 °F to 79°F (at 50 percent relative humidity) recommended by ASHRAE Standard 55-1992 during the summer season. 3. All the indoor measurements for relative humidity were within the ASHRAE recommended range of 30 to 60 percent for occupant comfort. 4. Five (5) of the indoor measurements for CO2 were above the ASHRAE Standard 62-1999 recommended maximum concentration of <700 ppm above the background level. The outdoor (background) CO2 concentration was 621 ppm. Therefore, the maximum acceptable level of CO2 at this location was 1321 ppm (background level + 700 ppm). The highest concentration (1394 ppm) was recorded on the 4^^ floor hallway at 5: 49 PM with 2 occupants. 5. None of the indoor measurements for respirable particulates were above the NPAAQS of 65 pg/m^ 24-hour average concentration of particulate matter 2.5 micrometers or less in aerodynamic diameter and One (1) of the indoor measurements was above 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, ext 290

Sincerely, Reviewed by- TC ASSOCIA TES INC.

Prasad Doddapaneni* James R. Cohn, CIH, CSP Senior Project Manager Regional Manager Industrial Hygiene Division Attachment

CONFIDENTIAL, CITY_21MC100_003462806 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180088