Form documenting the tracking and handling of environmental samples collected by the Department of Environmental Protection.
NYC-WTC_000145695–000145868Folder label: “NO INFO”
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
As shown in Table 15.0, the comparison of these results suggest that no conclusive difference could be observed.
Overall, the samples collected using the aggressive technique had a slightly higher percentage of samples below the detection limit (80 percent vs. 69 percent) than the samples collected with the modified-aggressive technique, while the samples collected using the modified-aggressive technique had a lower average concentration (0.00045 S/cc) than the samples collected using the aggressive technique (0.00071 S/cc).
5.9 Filter Overloading
As mentioned above, there were many instances where the filters from the asbestos air samples were overloaded with particulate material and could not be analyzed, which resulted in invalid asbestos air results and required additional cleaning events. During the study, the use of an air filtration device was added to the cleaning method for the third cleaning in an attempt to reduce the airborne particulate matter as both previous air sampling events resulted in overloaded filters. This occurred twice. In both cases, there was no overloading of the filters and valid asbestos air results were received. This prompted an evaluation to determine if there was a noticeable reduction in overloading filters with particulate matter when an AFD was used during the cleaning event. The data for all of the units in the building were used to see if there was a difference in the percentage of units with at least one overloaded filter when an AFD was used.
Table 16.0 presents a comparison of the percentage of units, including residential, common spaces, and commercial spaces, with asbestos air samples that could not be analyzed due to the filter being overloaded with particulate matter, and indicates whether or not an AFD was used. The data suggest that using an AFD during cleaning may offer a slight advantage for reducing the potential for overloading a filter with particulate matter.
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NYC-WTC_000145814
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NYC-WTC_000145027
Notice from NYC Law Department instructing staff to preserve World Trade Center documents for potential legal actions.
28 shared non-person entities · Same agency, volume and box · similarity 0.960
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Interim final report from EPA Region 2 detailing a background study of environmental conditions at the World Trade Center site.
28 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.960
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000155286
Formal letter criticizing the EPA and DEP for alleged failures in cleaning asbestos and silica from 114 Liberty Street.
13 shared non-person entities · 1 shared topics · similarity 0.964
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000155174
Chain of custody documentation for cleanup and monitoring samples at 114 Liberty distributed among project team members.
12 shared non-person entities · similarity 0.961
machine-extracted · confidence unavailable · Check page ↗12 shared non-person entities · similarity 0.961
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000138897
Internal DEP coordination regarding comments on 114 Liberty procedures and preparation of a response.
12 shared non-person entities · similarity 0.960
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000102521
EPA letter confirming that primary and secondary clearance levels for asbestos and other contaminants were met at 114 Liberty Street.
9 shared non-person entities · 1 shared topics · similarity 0.960
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000151524
EPA Region II letter confirming that primary and secondary clearance levels for asbestos and other contaminants were met at 114 Liberty Street.
10 shared non-person entities · 1 shared topics · similarity 0.959
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000154940
EPA confirms that primary and secondary clearance levels for contaminants at 114 Liberty Street have been met.
10 shared non-person entities · 1 shared topics · similarity 0.958
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000154998
EPA confirms that primary and secondary clearance levels for contaminants at 114 Liberty Street have been met.
10 shared non-person entities · 1 shared topics · similarity 0.956
machine-extracted · confidence unavailable · Check page ↗12 shared non-person entities · similarity 0.956
machine-extracted · confidence unavailable · Check page ↗11 shared non-person entities · similarity 0.954
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Archival folder label for September 11 news clippings from the Office of the Mayor, identified as Folder 0123.
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Updated memorandum defining the Red Zone boundaries and listing authorized agencies for entry into the restricted area.
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NYC-WTC_000142373
Directory of organizations providing financial aid, job placement, and space assistance to businesses affected by the disaster.
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NYC-WTC_000145027
Notice from NYC Law Department instructing staff to preserve World Trade Center documents for potential legal actions.
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Policy document outlining NYPD access requirements for building owners and contractors at the site in October 2001.
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