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NYC-WTC_000234747

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NYC 9/11 Public Portal Document

Summary of Asbestos Sampling Results Page 2 of 2

Address: 180 Park Row Date sampled: Dec 4, 2001

Air samples

Airborne fibers as determined by Phased Contrast Microscopy (PCM): An air sample is collected by pulling air through a filter. The filter catches fibers and is then sent to a laboratory to determine what types of fibers were in the air. Phase contrast microscopy identifies fibers based on size and shape, but not mineral composition. 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. By counting all fibers, we are being more protective of your health when we compare this to our screening value for asbestos fibers.

4rea Sampled Outside Common Residence 1 Residence 2 Sample Numbers No air sample No air sample A-Rl-29 VA-Rl-30 taken taken Concentration of Fibers in Air No air sample No air sample <.001 <.001 It this location taken taken Concentration of Fibers in Air <.001 <.001 to .003 <.001 to .003 <.001 to .003 it background locations Screening Value** .01 f/cc .01 f/cc 01 f/cc .01 f/cc

**Screening Value - The NYC standard for asbestos in community and residential buildings is 0.01 fibers/cubic centimeter (f/cc) in indoor air. This standard is used for re-occupancy in an indoor area where asbestos was detected and removed.

C:\Documents and Settings\sbenson\Local Settings\Tempcrary Internet Files\OLK3\Summary of Asbestos Sampling Resultsl22891.doc

CITY_21MC100_008831050

NYC-WTC_000234776

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NYC-WTC_000234776Source: NYC Law Department, mirrored locally

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