NYC-WTC_000223580

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan May 8, 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. Thirty-six (36) of the indoor temperature measurements collected were below and two (2) measurements were above the range of 73 to 79°F (at 50 percent relative humidity) recommended by ASHRAE Standard 55-1992 during the summer season. 3. All 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 CO2 were within the ASHRAE Standard 62-1999 recommended maximum concentration of <700 ppm above the background level. S.Three (3) of the outdoor respirable particulate measurements were 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, extension 211 or 212.

Sincerely, /I TCASSOCIA TES INC. Reviewed byf ■—7"

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

Attachment

CITY_21MC100_002891370

NYC-WTC_000223583