Table 3 Lead Surface Sampling
Sample No. Location Results - Lead Concentration
North Building
LW-02 7th Floor Room N733 <10.0 tgnilft2
LW-04 5th Floor Hallway Room N516 <10.0 j.tgrn1fi2
LW-06 3rd Floor Lobby by Room
N306 <10.0 ft
LW-08 1" Floor Hallway by Room N118C <10.0 ft
South Building
LW-03 7th Floor Room S757 <10.0 ft
LW-05 5th Floor Media Center Room S506 <10.0 gm/ft2
LW-07 3 Floor Corridor by Room S332 <10.0 j.tgm1ft2
!LW-09 3 Floor Lobby by Room S110H <10.0 ft2
Trailers
LW-10 Harrison Street Trailer #H103 <10.0 ft2
LW-i l Trailer #W102 <10.0 ft
LW-12 Trailer #W105 <10.0jtgm/ft2
LW-13 Trailer #W109 . <10.0 ft2
LW-14 Trailer #W112 <10.0 ft
LW-15 Trailer #W107 <10.0gm/ft2
LW-16 Harrison St. Trailer #H101 <10.0 ft
LW-17 Trailer #W103 <10.0 ft
Air Sampling for Respirable Dust & Silica
PSI collected 7 representative air samples on January 31 , 2002, one from each of six of the
Trailers and one from a nearby outside area. Samples were collected and analyzed by National
Institute for Occupational Safety and Health (NIOSH) Method 7500 to determine ambient or
background airborne nuisance dust and respirable silica concentrations. Respirable dust
concentrations ranged from 0.0178 mg/m3 to 0.4978 mg/m3, which are well below the
Occupational Safety and Health Administration (OSHA) limit of 5 mg/m3 and the American
Conference of Governmetal Industrial Hygienists (ACGIH) limit of 3 mg/m3. Analytical results
are shown below in Table 4.
Respirable silica was below the analytical sensitivity of 0.0100 mg/m3 for all of the samples
collected, therefore all concentrations are below the NIOSH limit of 0.05 mg/m3 and the ACGIH
limit of 0.1 mg/m3 for airborne silica. Analytical results are shown below in Table 4.
Table 4 Respirable Dust & Silica Air Sampling
Sample No. Location Respirable Dust Respirable Silica
RS-01 Trailer #H102 - Center 0.0222 mg/m3 <0.0100 m
RS-02 Trailer #W102 - Center 0.0178 mg/m3 <0.0100 mg/m3
RS-03 Trailer #W106 - Center 0.4978 m3 <(.0100 m
RS-04. Trailer #W107 - Center 0.0467 mg/m3 <0.0100 m
RS-05 Trailer #W1 10 - Center 0.0600 mg/m3 <0.0100 mg/m3
RS-06 Trailer #W112 - Center 0.0711 mg/m3 <0.0100 m3
RS-07 Outside on wooden walkway 0.0622 m3 <0.0100 m
4 of 6
BMCC
Environmental Testing
NYC-WTC 000106395
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