NYC-WTC_000121065
Summary of air and dust sampling results collected from private residences and common areas at 250 South End Avenue.
2 shared non-person entities · similarity 0.949
machine-extracted · confidence unavailable · Check page ↗Document / 4 pages
Asbestos dust monitoring report, 100 Church Street, April 2002
Machine-extracted title · confidence 95%Environmental monitoring report documenting asbestos dust levels during carpet removal operations at the New York City Law Department office.
NYC-WTC_000174311–000174314Page image
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NYC 9/11 Public Portal Document
Mr. G. Foster Mills New Fork City Law Department April 9, 2002 Page 3
2.1 Personal Air Sampling
Asbestos
Personal air sampling for airborne fibers was based on procedures described by OSHA. This involves placing a personal air-sampling pump on a worker throughout the duration of a work shift. An air sample filter cassette was attached to the pump by a flexible plastic (tygon) tube and clipped to the collar of a worker, i.e. the cassette was positioned inside the worker’s “breathing zone”. Air was drawn through the cassette, thereby trapping airborne particles and fibers on the filter.
The cassettes were sent to a laboratory for analysis by PCM and the results compared to the OSHA PEL. One hundred and eighty two (182) air samples were collected from the breathing zones of various workers who removed the carpeting. These samples were collected throughout the 12-hour work shift and were analyzed for airborne fibers using Phase Contrast Microscopy (PCM). All 182 samples were found to be below the OSHA PEL of 0.1 fibers per cubic centimeter of air (fZcc). As a quality control measure, five (5) of these samples were re-analyzed by Transmission Electron Microscopy (TEM), which differs from PCM in that TEM can differentiate between asbestos and non-asbestos fibers. No asbestos was detected in the five samples analyzed by TEM.
Seventy (70) samples were collected from workers for a 30-minute duration and were analyzed for airborne fibers using PCM. All 70 samples were found to be below the OSHA STEL of 1.0 free. As a quality control measure, two (2) of these samples were re-analyzed by TEM, and no asbestos fibers were detected.
Ethanolamine
Personal air sampling for ethanolamine vapor was conducted by placing a personal air sampling pump on a worker and drawing air through a filter cassette for the duration of the 12-hour work shift. The cassette was sent to a laboratory for analysis and the results were compared to the OSHA PEL.
Sixty-six (66) were collected from the breathing zones of various workers who removed the carpeting. All 66 samples were below the analytical detection limit.
2.2 Area Air Sampling
Air samples were collected adjacent to the areas where the carpet removal was being performed. These are known as “area” air samples. These samples differed from personal air samples in that the sample
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NYC-WTC_000174313
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NYC-WTC_000174313Source: NYC Law Department, mirrored locally
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Forwarded EPA memorandum dated June 9, 2002, concerning the Asbestos Reservoir and carpet testing methods.
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DEP asbestos project notification form and inspection report dated December 12, 2002.
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Chain of custody documentation for bulk sampling and air monitoring at 365 South End Avenue Building 300.
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OSHA letter to the EPA providing a description of asbestos monitoring data used for selecting personal protective equipment for cleanup contractors.
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