IAQ Report Cover Letter, 90 Trinity Place, Mar 2002

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan March 27, 2002 Indoor Air Quality Assessment Page 4 H.S. for Leadeishit) & Public Service (M894) ATC Project No. 15-19125-0290 concentration of particulate matter 2.5 micrometers or less in aerodynamic diameter. Three (3) of the twelve (12) instantaneous outdoor measurements were above the USEPA recommended concentration of 40 ug/m^ for sensitive individuals such as asthmatic people and children.

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

TVOC Concentration

The TVOCs concentrations were 0 ppm inside the building. These concentrations were below the AIHA guideline for odor control of 1 ppm. The outdoor TVOC concentration was also 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;

FINDINGS

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

1. Concentrations of CO and TVOCs were below applicable standards and guidelines. 2. One hundred and one (101) indoor measurements for temperature were above and twenty­ seven (27) measurement were within the range of 68 to 75°F (at 50 percent relative humidity) recommended by ASHRAE Standard 55-1992 during the heating season (wintertime conditions). 3. One hundred and twenty-one (121) of the indoor measurements for relative humidity were below and seven (7) measurements were within the ASHRAE-recommended range of 30 to 60 percent for occupant comfort. 4. One (1) of the indoor measurements for CO2 was above the ASHRAE Standard 62-1999 recommended maximum concentration of <700 ppm above the background level. The highest measurement was taken in the gymnasium at 12:54 PM with one (1) occupant. Levels above the recommended maximum do not indicate a health risk. Carbon dioxide measurements are used as an indicator of available outdoor air. The primary source of CO2 indoors is occupant respiration. 5. All of the indoor measurements for PM2.5 were below the NPAAQS of 65 pg/m^ 24-hour average concen tration of particulate matter 2.5 micrometers or less in aerodynamic diameter and the USEP/^ recommended concentration of 40 pg/m^ for sensitive individuals such as asthmatic people and children. One (1) of the outdoor measurements for PM2 5 was above the NPAAQS of 65 pg/m^ 24-hour average concentration of particulate matter 2.5 micrometers or less in aerodynamic diameter. Three (3) of the twelve (12) instantaneous outdoor measurements were above the USEPA recommended concentration of 40 pg/m^ for sensitive individuals such as asthmatic people and children.

CONFIDENTIAL, CITY_21MC100_0 07741199 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

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