Air monitoring plan Part III, 30 Warren Street, January 2006

NYC 9/11 Public Portal Document

Regulatory Submittal Part 11- Environmental Community Air Monitoring Program Fiterman Hall— 30 West Broadway Airtek Project 05-0867-- January 10, 2006

Footnote 1: Sampling duration and/or flow rates may be modified to provide optimum analyte loading for analysis based on results of ongoing analyses. Initial Sampling flow rates should be in accordance with rates prescribed in the sampling method.

Footnote 2: Organics will be sampled as provided below under "Notes on the Community Air Monitoring Table" below.

Notes on Community Air Monitoring Table:

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:

1. The sensitivity on TEM air samples will be less than 0.002 s/cc. 2. Both the length and width of all asbestos fibers will be recorded. 3. Confirmation by EDS and/or SAED will be performed for each fiber analyzed. 4. The mineralogy of the fibers will be noted and recorded.

Dust:

Airborne dust and particles at the Site will be monitored using real-time air monitoring instrumentation. Real-time air monitoring for PM-2.5 and PM-10 will be accomplished with direct reading particulate in air monitors (Met One E-BAM). Data from E-BAMs are to be data logged. At one location the Met One E-BAM data will be compared against PM-2.5 results from a Rupprecht and Patashnick TEOM instrument. At another location, the E-BAM data will be compared against PM-10 results from another Rupprecht and Papashnick TEOM instrument. This equipment will be operated for at least two weeks before the Remediation Phase begins. Prior to the commencement of the Remediation Phase, the EPA Region 2 office will be provided with the results of comparing the data from the E-BAM with the TEOM and the proposal of a correction factor, if needed.

Respirable Crystalline Silica — Metals:

Respirable crystalline silica sampling will be performed according to NIOSH Method 0600 protocol with analysis following-NIOSH Method 7500 (XRD).

Metals sampling and analysis will be performed following NIOSH 7300 "Elements by ICP," except that ICP-MS will be utilized. A hot block/acid digestion will be utilized. Metals to be analyzed by ICP-MS and reported are: Antimony, Barium, Beryllium, Cadmium, Chromium, Copper, Lead, Manganese, Mercury (particulate), Nickel and Zinc.

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NYC-WTC 000096684