NYC-WTC_000189106

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan March 14, 2002 Indoor Air Quality Assessment Page 4 P. S. 234M ATC Project No. 15-19125-0279

* 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 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 ,CO2and TVOCs were within applicable standards and guidelines. 2. None of the indoor or outdoor PM2.5 measurements were above the NPAAQS of 65 pg/m^. All nine (9) outdoor measurements were above the USEPA recommended PM2,5 concentration of 40 pg/m^ for sensitive individuals and children. None of the indoor measurements were above the USEPA recommended PM2.5 concentration of 40 pg/m^ for sensitive individuals and children. 3. Twenty-pight (28) of the measurements of relative humidity were below the ASHRAE recommended range of 30 to 60 percent for occupant comfort. 4. Seventeen (17) of the temperature measurements were above the range of 68 to 75°E (at 50 percent relative humidity) as recommended by ASHRAE Standard 55-1992 during the heating season (wintertime conditions).

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, 4 TC ASSOCIA TES INC. Reviewed by:

lannis Efstathiou James R. Cohn, CIHTCSP Project Manager Regional Manager, Industrial Hygiene Division

Attachment

CITY_21MC100_003083647

NYC-WTC_000189109