Air quality test reports cover letter, Jan 2002

NYC 9/11 Public Portal Document

03,'26/2201 10:14 5315803295 E'aVIR0SCIEt••,CECNSLTAN PAGE 05

American Stock Exchange,28 September 2001

Main Trading Floor upper level 580 < 5.0 <0% <0% <0% Sec E 1501 floor 1506 480 90 -19% <1e/a <0% 12' floor central 460 84 <99% <1% <0% 10* floor central 540 <5.1) <1% <0% <0% 7th floor 718 480 64 <99% <1% <0% Harry's Trading floor Post 600 < 5.0 <1% <0% <0°% 25/C2l

22 Thames Street & 65 Broadway Respirable Dust in Air Results Location Air Volume Results I-Sum 6- I opm >10 um Liters Red room post 21 MF8, 22 500 <5.0 <1% <0% <0% Thames 10' floor Center, 22 Thames 660 225 96% 4% <0% 9e Floor Center, 22 Thames 716 190 95% 5% <0% 7N Floor Center, 22 Thames 836 194 95% .5% <0% 1'""FloorCenter, 65 Broadway 600 384 91% 9% <1% 16 Floor Center, 65 Broadway 580 337 90% 9% <1%

The respirable dust mass results indicate that some indoor environments are very dusty. The particle size distribution indicates that where the particulates are found they are very small and the occupants will have dry scratchy throats and coughing. The trading areas and other areas have below detectable limits of resprable dust. The dust was created by the catastrophe and came in openings in the building created by the catastrophe and open doors and open windows.

The cleaning process on the floors and the cleaning of the HV.A.0 system currently progress will significantly reduce the dust levels on the floor.

Polychlorinatedhiphenyls (PCBs) are produced through combustion of fuels and plastics and are found In electrical insulation material and electrical ballasts ir. lights. The PCB in air samples were collected from areas considered representative of the building. Two samples were collected from the trading floors and one sample was collected from the 9a' and 10`" floor c:122 Thames Street to characterize the building and accelerate the building screening process. The ?CB in air results are presented in the table below. Paged of 9

NYC-WTC 000105115