Document label for 10 Cortlandt Street

NYC 9/11 Public Portal Document

Hillmann Environmental Group. LLC

SECTION 2- INTRODUCTION

2.1 General. On October 19, 2002, Mr. Craig Downs, Project Manager, Mr. Shane Bielawski, IHT and Ms. Jennifer Brown, IHT, of Hillmann Environmental Group, LLC (Hillmann), conducted an Environmental Health Risk Assessment of 22 Cortlandt Street, New York, NY. This investigation was conducted under the supervision of John B. Glass, Jr., CI.H, CS?; an ABIH certified Industrial Hygienist. The work was performed for GAB Robins North America Inc., and Cushman and Wakefield Management. The survey is designed to identify common indoor air contaminants.

Hillmann's site investigator performed a visual inspection for conditions that could negatively impact indoor air quality. The investigator measured temperature, relative humidity, carbon dioxide, carbon monoxide, respirable dust, and collected samples for volatile organic compounds, silica and total dust, PCB, mercury, metal fumes, dioxins, and asbestos.

The inspection and sampling arc performed by trained industrial hygienists using Environmental Protection Agency (EPA) and National Institute for Occupational Safety and Health (NIOSH) sampling techniques. Samples are analyzed at an appropriately accredited laboratory. These samples, representative of a narrow time frame, are for screening purposes only and arc not intended to represent definitive exposure levels.

2.2 Sampling Parameters and Methodology. Hillmann selected the sampling parameters based on consultations with the client, the laboratories performing the analysis and our in-house experts. The chosen parameters are direct reading measurement of temperature, relative humidity, carbon dioxide, carbon monoxide, respirable dust, and mercury, and collected samples for volatile organic compounds, dioxins, and Polychlorinated Biphenyls (PCBs). The inspection is a general screening to identify if potential hazards exist.

The industrial hygienist employed a sampling scheme that is representative of the average working environment and accounts for the subject space. Sampling parameters were based on common indoor air pollutants and were selected based upon consultations with our client, advise from the analytical laboratory and Hillmann's professional judgment.

1. Temperatures and relative humidity levels were measured using a TSI Q-Track 8551 direct reading monitor.

1I. Carbon Dioxide (CO2) concentrations were measured using a TSI Q-Track 8551 direct reading monitor that measures COt from 0-5000 ppm in I ppm increments.

Ill. Carbon Monoxide (CO) concentrations were measured by a TSI Q-Track 8551 direct reading monitor which measures CO from 0-500 ppm in I ppm increments.

IV. Respirable Dust (RD) concentrations were determined by a direct reading, MIE pdm-3, Miniram monitor calibrated to an average aerodynamic diameter of 10 micrometers with a limit of detection of 0.001 mg/m'. This method is consistent with the United States Environmental Protection Agency National Ambient Air Quality Standard (NAAQS).

V. Total dust samples were collected by drawing air through a 32 mm, 0.5 micron polyvinyl chloride (PVC) filter. An accredited laboratory then analyzed the samples by an X-ray diffraction method in accordance with the NIOSH 7500 Method.

22 Cortlandt Street/New York. NY/Project Number Y2-1458 Pnge 3

NYC-WTC 000126264