Minerals and fibers analysis report, Bldg 26 Nov 2001

NYC 9/11 Public Portal Document

Enclosure 1 Results of Minerals and Fibers in Air and for Settled Dust Sampling in Building 26 (16 Jay Street)

On December 1, 2001, air and settled dust samples were collected from inside 2 residential units, 1 common area, and from 1 outdoor location close to your building. Because there was no visible dust present, no outdoor settled dust sample was collected. The samples were analyzed for crystalline minerals and for fibers. The results of samples collected from your building, along with the results of the samples collected in Manhattan comparison residential buildings above 59*’’ Street, are the focus of this enclosure.

Explanation of Tables la and lb: Crystalline Minerals found in Air and Settled Dust in Your Building and the Comparison Areas

Air Sample Collection and Analyses: Air samples were collected using vacuum pumps to draw air past a filter that was suspended at the height of a person’s breathing level. Air samples were collected for 4 different dust or particulate matter (PM) sizes: PM2.5, PM4, PMIO, and PM 100. Particles with diameters of 4 microns or less (PM4 and 2.5) contain the fraction of particles that can be inhaled and enter the air exchange region of the lungs (air sacs). This fraction is often referred to as respirable size particles. The PMIO or thoracic fraction contains dust particles with diameters of 10 microns or less. This fraction includes the PM4 fraction, so it contains the respirable size particles along with particles from greater than 4 and up to 10 microns in diameter. These larger particles can deposit along lung airways. The PMIOO or inhalable fraction contains particles with diameters of less than 100 microns. It includes particle sizes that can deposit in the lung air sacs (PM4), the lung airways (PMIO), and the nose and throat.

X-Ray Diffraction (XRD) was used to analyze each of the different size ranges for all of the crystalline mineral analytes (quartz, cristobalite, tridymite, calcite, portlandite, gypsum, mica, and halite). XRD analysis identifies crystalline materials by their unique “fingerprint” given off from a beam of X-Ray. Because of quality assurance concerns regarding sample tracking, the results of the XRD analysis are being categorized as estimated values. In addition, because of the sample tracking concerns, we are not certain enough of air sample location (e g., indoors vs. common indoor area). For this reason, Table la only indicates whether a mineral was found (detected) in the size fraction of interest, or not (not detected). Therefore, we are not reporting results by sample location. More detailed information can be found in the final technical report.

The results indicate the presence of quartz in air. Quartz was not found in the air offhe comparison homes.

Settled Dust Sample Collection and Analyses:

CONFIDENTIAL, CITY_2IMCl00_003434273 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176156