NYC-WTC_000213095

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan May 29 2002 Indoor Air Quality Measurements Page 4 Stuvvesant High School (M4771 ATCProiectNo. 15-19125-0246

In addition to higher efficiency rating filters on their HVAC units, portable High Efficiency Particulate Air (HEPA) purifiers were placed in Rooms 327, 333, 638 and 740. The RM2 5 concentration range for these rooms was 19-25 pg/m^ with an average of approximately 22

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

Tf^OC Concentration

TVOCs inside the building were 0.0 ppm for all readings. The outdoor TVOC concentrations were 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 barge operations in pier 25 has been shut down.

FINDINGS

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

1. Concentrations of indoor respirable particulates, CO , and TVOCs were below applicable standards and guidelines. 2. Ninety-nine (99) of the indoor measurements were below and nineteen (19) were within the range of 68 to 75°F (at 50 percent relative humidity) recommended by ASHRAE Standard 55-1992 during the mechanical cooling season (summertime conditions). 3. Sixty-two (62) of the indoor measurements for relative humidity were above and none of the measurements were below the ASHRAE-recommended range of 30 to 60 percent for occupant comfort. 4. Eight (8) of the CO2 indoor measurements were above the ASHRAE Standard 62-1999 recommended maximum concentration of <700 ppm above the background level. The highest reading (1196 ppm) was taken in room 1004 at 2:35 PM with 30 occupants. 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.

CITY_21MC100_002868703

NYC-WTC_000213098