Cover letter enclosing air quality reports, Trinity Place, Jan 2002

NYC 9/11 Public Portal Document y. 99/2$/2i .i 10:14 6315803195 ENVIR0SCIENCEC4STAN PAGE 04

American Stock Exchange,28 September 2001

86 Trinity Place Lead in Air Results Location Air Volume Liters Results Mghra' Post 2 See A Main Trading 1,200 < 5.0 Floor Post 8 See G Main Trading 1,200 < 5.0 Floor 1S* floor north side 1,200 397 12"' floor central 1,200 445 10°' floor central 1,200 < 5.0 7* floor central 1,200 < 5.0 Harry's Trading floor 1,200 < 5.0

22 Thames Street Lead in Air Results Location Air Volume Liters Results j..g/m' Red room post 21 MF8 1,200 < 5.0 10 floor north side 2,450 <5.0 9t' floor central 1,580 9.0 7 floor central 2,020 11.0

Except for the 151' floor and the 12°' floor these values are all less titan the OSHA lead PEL 0150 cgirn'. Before and during the time of air sampling the fire escape doors to these floors were left open all day and all night to cool the floor. It is believed that the lead irs these samples blew in through the open fire escape doors and deposited on the filter media of the samples. We believe that the lead levels in these spaces were temporary and that they settled to the floor. The 15* floor and 12"' floor were re- sampled on September 29a, 2001, to more fully characterize the lead in air values.

The respirable dust (breathable) in air samples were collected from areas considered representative of the building. Respirable dust samples were collected to show particle dust mass and the distributicn of particle size. Only one sample was collected from each area to speed up the building screening process. The respirable dust in air results are presented in the tables below.

86 Trinity Place Respirable Dust in Air Results Location Air Volume Results 1-5m 6-10pm. >10zu Liters Post 2 Sec G Maine Trading 600 <5.0 <1% <0% <0% Floor

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