NYC-WTC_000218435

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan February 4. 2002 Indoor Air Quality Assessment Page 4 P. S. 234M ATC Project No. 15-19125-0297

* The measurements made during this assessment were instantaneous readings, the NP.Y\QS 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: • Tire interior of the building appeared clean and free of dust and debris: • The building was occupied by staff at the time of the assessment; • T here was a lot of activity (e.g. moving) in the building; • No smoke odor was detected in the building.

FINDINGS

Based on the real-time measurements, the following findings are presented:

1. Concentrations of CO2, CO and TVOCs were within applicable standards and guidelines: 2. All measurements of PM2,5 were below the NPAAQS of 65 ug/m^; Thirteen (13) measurements were above the EPA recommended level of 40 ug/m^; 3, All indoor measurements of relative humidity were within the ASHRAE-recommended range of30 to 60 percent for occupant comfort; 4. All but two (2) temperature measurements were below the range of 68 to 75° F (at 50 percent relative humidity) 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-S2SO, extension 261 or 212.

Sincerely, ATC ASSOCIATES

James R. Cohn, CIH, CSP Regional Manager Industrial Hygiene Division

Attachment

CITY_21MC100_002878435

NYC-WTC_000218438