NYC-WTC_000214382

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan May 14, 2002 Indoor Air Quality Assessment Page 4 P.S. 150M ATC Project No. 15-19125-0289 pg/m^. The outdoor respirable particulate concentration measurements ranged from 50 to 60 pg/m3 with an average of 55 pg/m^.

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

TVOC 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: • There was construction work going on in the plaza; • The school 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, and TVOCs were within applicable standards and guidelines; 2, 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 mechanical cooling season (summertime conditions). 3. Eleven (11) measurements of relative humidity were above the ASHRAE recommended range of 30 to 60 percent for occupant comfort. 4. One (1) CO2 measurement was above the ASHRAE Standard 62-1999 recommended maximum concentration of <700 ppm above the background level. 5. Nine (9) of the indoor and all of the outdoor respirable particulate readings were above the USEPA recommendation of 40pg/m3 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, Reviewed by: TC ASSOC/A TES INC.

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

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