Asbestos sampling summary report, Nov 2001

NYC 9/11 Public Portal Document

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Summary of Asbestos Sampling Results 225 Rector Place, New York, NY 10280 Date sampled: November 16,2001

Four locations were sampled at your building: inside two private residences, an indoor hallway, and a nearby outdoor area (see tables below for sampling results). Air samples were collected in each of the four locations by using vacuum pumps to draw air past a filter that was suspended at the height of a person’s breathing level.

One settled dust sample was collected at each of the indoor locations. Indoor dust and debris samples were collected on a filter by vacuuming surfaces. Outdoor dust samples were collected only when there was visible dust and debris to obtain bulk material. No dust was available for bulk sampling outside of your building.

The collected material was weighed, viewed under a microscope, and/or chemically processed to determine the types and quantities of substances present. The materials are being analyzed for fibers such as asbestos, fiberglass, synthetics (e.g. man-made materials such as nylon and polyester), cellulose (e.g. cotton, paper), silica, and for other minerals and small particles.

ASBESTOS AIR TEST RESULTS

The air samples tested from directly outside and in the hallway of your building were taken during normal daily activity. The two air samples were taken from the unoccupied apartments after the dust in the apartments was aggressively “stirred up” to ensure that an accurate sample of particles would be present. Both the hallway and the apartments had been cleaned since September 11* All air samples were examined in a laboratory for fibers using the Phase Contrast Microscopy (PCM) method.

Results of all of the air samples taken from your building were within the standard set for indoor air quality - 0.01 fibers per cubic centimeter (f/cc) (see tables below). The highest level of fibers in the air at your building was 0.002 f/cc, found in an unoccupied residence. All of the air levels sampled in your building are similar to the air results from buildings located above 59“* Street, which are not expected to have been impacted by WTC materials. In the homes above 59* Street, levels of fibers found in the air ranged from less than 0.001 f/cc to 0.003 f/cc.

Airborne fibers as determined by PCM analysis: An air sample is collected by pulling air through a filter. The filter catches fibers and is sent to a laboratory to determine the number of fibers in the air. Phase contrast microscopy identifies fibers based on size and shape, but not the specific type of fiber. Therefore, the fibers seen by PCM include asbestos fibers as well as other fibers, such as textiles, fiberglass, cellulose, which might be present in your home. The PCM analysis assumes that all fibers present were asbestos. Therefore, less hazardous fibers that may have been present, such as textiles or fiberglass, are counted along with the asbestos fibers, and the total fiber count is then compared to the asbestos standard. If the results were above 0.003

CONFIDENTIAL, CITY_2IMCl00_003423634 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

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