NYC-WTC_000231976

NYC 9/11 Public Portal Document

Section 2 - Ambient Air Monitoring Program Revision No.: 0 130 Liberty Street Deconstruction Plan Date: September 7, 2005 Lower Manhattan Development Corporation

The data from the E-BAM units will be recorded by digital data loggers using the analog signal outputs of the monitors. The PMio and PM2.5 data from the E-BAM monitors will be recorded as 10-minute, and daily (e.g., 8 AM - 8 AM) averages.

5.1.2 USEPA Reference Method PMjoand PM2.5 Monitors

One reference method PMio sampler and one reference method PM2.5 sampler be collocated along side of the real-time PMio and PM2.5 monitors as a quality assurance (QA) check. The samplers will rotate on a monthly basis through all real-time PMio and PM2.5 monitor locations for the duration of the monitoring program. It is proposed that filter based PMio and PM2.5 EPA Reference Samplers be used such as an Andersen RAAS or performance equivalent system. In this manner the 24-hour average PMio and PM2.5 concentrations (ug/m3) measured gravimetrically using the filter collection method can be directly compared to the average PMio and PM2.5 concentrations measured using the collocated EBAM sampling system. The latter value will be expressed as a 24-hour average representing a composite of all 10-minute average values (144 values per 24-hour period).

5.2 Asbestos

Asbestos sample collection will be performed in accordance with NIOSH 7402 mod., “Asbestos by TEM”. Asbestos analysis will be performed utilizing Transmission Electron Microscopy (TEM) analysis specified in 40 CFR Part 763, Asbestos Hazard Emergency Response Act, (AHERA), with the following modifications:

• The sensitivity on TEM air samples will be less than 0.002 s/cc. • Both length and width of all asbestos fibers will be recorded. • Fibers greater than 5 microns in length (PCM equivalents) will be recorded separately. • Confirmation by Energy Dispersive Spectroscopy (EDS) and/or Selected Area Electron Diffraction (SAED) will be performed for each sample. • The morphology of the fibers will be noted and recorded.

In addition to collection and analysis of samples for asbestos via TEM, air samples will also be collected and analyzed for asbestos utilizing the Scanning Electron Microscopy (SEM) analysis via the German VDI method 3492. The air samples will be collected and analyzed by SEM should TEM air samples be found to be overloaded with general particulate matter.

5.3 Metals

• Metals sampling and analysis will be performed following EPA Reference Methods for the collection of Total Suspended Particulate (TSP) and lead (40 CFR Part 50 App B and G) in combination with EPA Method IO 3.5 for the analyses of metals by ICP/MS.

• Metals to be analyzed by ICP/MS and reported are: Antimony, Barium, Beryllium, Cadmium, Chromium, Copper, Eead, Manganese, Nickel and Zinc.

5-3

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