NYC-WTC_000179059

NYC 9/11 Public Portal Document

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

TVOC Conceniml.ion -

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 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; • The HEPA air purifiers in rooms 638 and 740 were shut off.

FINDINGS

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

1. Measurements of temperature and concentrations'of respirable'particulates, CO and TVOCs were within applicable standards and guidelines.

2. Eighteen (18) COo measurements were above the range recommended by ASH RAE 62- 1999. All others were below the recommended ma.ximum concentration.

3. Si.vteen (16) indoor measurements of relative humidity were within the ASHRAE- recommended range of 30 to 60 percent for occupant comfort. Ail other measurements were below the ASHRAE-recommended range.

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 261 or 212. ' .

Sincerely, ATC ASSOCIATES INC: Reviewed by:

Andreas C. Andreoii James R. Cohn, ClHjCSP”' Senior Project Manager Regional.Manager Industrial Hygiene Division

Attachment

CONFIDENTIAL, CITY_21MC100_003457523 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179062