NYC-WTC_000204459

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan May 9, 2002 Indoor Air Quality Measurements Page 4 Stuyvesant High School (M477) ArcPrqiectNqM5-19125-0246

In addition to higher efficiency rating filters on their HVAC units, portable High Efficiency Particulate Air (HEPA) purifiers were placed in Rooms 327, 333, 638 and 740. The PM2.5 concentration range for these rooms was 13-21 pg/m^ with an average of approximately 17 pg/m3.

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

TVOC Concentration TVOCs inside the building were 0.0 ppm for all readings, lire outdoor TVOC concentrations were 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. Concentrations of CO , CO2 and TVOCs were below applicable standards and guidelines. 2. All measurements of relative humidity were within the ASHRAE recommended range of 30 to 60 percent for occupant comfort. 3. All temperature measurements were below the range of 73 to 79°F (at 50 percent relative humidity) recommended by ASHRAE Standard 55-1992 during the heating season (summertime conditions). 4. All indoor and outdoor respirable particulate measurements were below the USEPA recommendation 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, H TC ASSOCIA TES INC.

Reviewed by:

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

Attachment

CITY_21MC1OO_OO3O6O688 NYC-WTC_000204462