NYC-WTC_000232249

NYC 9/11 Public Portal Document

The data from the Dust Monitors will be recorded by CSI CR510 digital data loggers, and telemetered back via CDMA cellular modems. The loggers on-board the units will act as backup to the CSI loggers.

5.1.2 USEPA Reference Method PMjoMonitor

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

5.2 Asbestos

Asbestos sample collection will be performed in accordance with NIOSH 7402, “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. • 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.

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) in combination with EPA Method 10 3.3 for the analyses of metals by X-Ray fluorescence.

• Metals to be analyzed by XRF and reported are: Antimony, Barium, Beryllium, Cadmium, Chromium, Copper, Lead, Manganese, Nickel and Zinc.

5.4 Mercury (GasA/apor)

Real-time monitoring foiv mercury will be performed utilizing a Lumex RA 915+ direct read instrument. The readings will be included with the daily download of sample collection data.

The Lumex RA 915+ will be utilized to obtain detection levels below established site air contaminant criteria. At a minimum, mercury readings will be taken twice a shift at each of the fixed air monitoring locations (seven during Abatement Phase and Demolition Phases). At the

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