Indoor air quality report cover letter, P.S. 150M, May 2002

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan May 28, 2002 Indoor Air Quality Assessment Page 4 P. S. 150M ATC Project No. 15-19125-0289 * 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 indoor respirable particulates, CO, and TVOCs were within applicable standards and guidelines. 2. Twenty-seven (27) of the indoor measurements for temperature were below the range of 73 to 79°F (at 50 percent relative humidity) as recommended by the ASHRAE Standard 55- 1992 during the mechanical cooling season (summertime conditions). 3. All of the measurements for relative humidity were within the ASHRAE-recommended range of 30 to 60 percent for occupant comfort. 4. One (1) of the CO2 measurements was above the ASHRAE Standard 62-1999 recommended maximum concentration of <700 ppm above the background level. The highest level was recorded in the music room at 1:00 PM with 25 occupants. Levels above the recommended maximum do not indicate a health risk. Carbon dioxide measurements are used as an indicator of available outside makeup air. The primary source of CO2 indoors is occupant respiration. The school building was occupied during ATC’s assessment.

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 ASSOCIA TES INC.

/Amel Jay^ James R. Cohn, CIH, CSP Senior PtOject Manager Regional Manager Industrial Hygiene Division Attachment

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