The Lower Manhattan Development Corporation currently collects ambient air samples from the following locations:
Four (4) locations around the base of 130 Liberty Street, generally at each of the four corners of the building;
Rooftop of 10/10 Fire House, 124 Liberty Street
Rooftop of residential building, 120 Cedar Street
Rooftop of Marriott Hotel, 85 West Street
Target Air Quality Levels and USEPA Site Trigger Levels
Analyte
Lab Turnaround Time (TAT)1
Target Air Quality Levels2
USEPA Site Specific Trigger Levels3
Metals
Antimony
3 days
5 ug/m3
14 ug/m3
Barium
3 days
5 ug/m3
5 ug/m3
Beryllium
3 days
0.02 ug/m3
0.2 ug/m3
Cadmium
3 days
0.04 ug/m3
2 ug/m3
Chromium4
3 days
0.6 ug/m3
0.6 ug/m3
Copper
3 days
10 ug/m3
100 ug/m3
Lead
3 days
1.5 ug/m3
5 ug/m3
Manganese
3 days
0.5 ug/m3
0.5 ug/m3
Mercury (Total)
3 days
0.3 ug/m3
3 ug/m3
Nickel
3 days
0.2 ug/m3
28 ug/m3
Zinc
3 days
16 ug/m3
160 ug/m3
Particles and Dust
Asbestos
24 hours
0.0009 f/cc (PCME fibers)
70 S/mm2 (TEM AHERA structures)
Particulate PM10 (24 hour average)
Real Time
150 ug/m3
150 ug/m3
Particulate PM2.5 (24 hour average)
Real Time
40 ug/m3
65 ug/m3
Respirable Silica (crystalline)
3 days
10 ug/m3
10 ug/m3
Organics (semi-volatiles)
Dioxins/Furans (2,3,7,8 – TCDD equivalent)
5 days
0.00025 ng/m3
0.025 ng/m3
PCB (total Aroclors)
5 days
0.12 ug/m3
12 ug/m3
PAH (benzo-a-pyrene equivalent)
5 days
0.034 ug/m3
3.4 ug/m3
1Laboratory turnaround times are determined by the analytical methodologies specified by the regulatory agencies who approved the Deconstruction Plan. All laboratory turnaround times are approximate and refer to business days.
2A cumulative average after the first week of sampling, except for PM2.5 and PM10 3A 24-hour value
4USEPA site-specific trigger level for hexavalent chromium used
USEPA – United States Environmental Protection Agency
PM – Particulate Matter
PCB – Polychlorinated Biphenyl
PAH – Polycyclic Aromatic Hydrocarbons
TEM – Transmission Electron Microscopy
AHERA – Asbestos Hazard Emergency Response Act
NIOSH – National Institute of Occupational Safety & Health
OSHA – Occupational Safety and Health Administration
TWA – Total Weighted Average
ug – Micrograms
ng – Nanograms
m3 – Cubic meters
f/cc – Asbestos fibers per cubic centimeter
S/mm2 – Asbestos structures per square millimeter
