Preliminary environmental assessment report, 30 Warren Street, January 2006

NYC 9/11 Public Portal Document

Environmental Charactenzation Report Fiterman Hall, 30 West Broadway, New York, NY Airtek Project #05-0867 — January 10, 2006

Personal exposure monitoring was conducted in strict accordance with published sampling and analytical methodologies. These included National Institute for Occupational Safety & Health (NIOSH) and Occupation Safety & Health Administration (OSHA) sampling protocols. Analytes included Asbestos and the Contaminants of Potential Concern (CoPCs), as defined by the U.S. EPA's COPC Committee. These include Silica, Polycyclic Aromatic Hydrocarbons (PAHs), Dioxin, Polychlorinated Biphenyls (PCBs), Heavy Metals (Barium, Beryllium, Cadmium, Chromium, Copper, Lead, Manganese, Nickel, and Zinc), and Mercury.

To measure personnel exposure to airborne contaminants workplace air is sampled over an 8-hour period, or for the full work shift. Data from this sampling is calculated into an 8-hour time weighted average (TWA) for comparison to established worker exposure guidelines. An Airtek Industrial Hygienist observed and recorded general information about personnel work processes conducted during the sampling. Site workers were asked to voluntarily wear personal monitors to assess COPC exposure during site characterization field work.

4.3 Exterior Dust Investigation

As further described in the companion document Facade Characterization Report, a close visual inspection was conducted of the building facade as a part of an assessment of the need for exterior cleaning of the facade. In addition to visual inspection, wipe sampling of facade surfaces was conducted to assess residual heavy metals surface concentrations as an illustration of overall conditions.

Airtek environmental technicians collected heavy metals wipe samples from representative exterior surfaces at the 14`h Floor Setback, the 5`h floor setback, and at ground level. Samples were collected in accordance with the NIOSH 9100 dust wipe protocol for lead sampling. Wipe sampling was carried out in a carefully controlled manner in order to ensure the validity of the results. The samples were taken with commercially available "ghost-wipes." The area sampled was a precisely measured surface area. Careful precautions were taken in order to avoid cross contamination of samples and to keep track of sampling locations. The measurements and locations of the samples collected were 10

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