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
5.8 Air Disturbance
The asbestos air samples were collected using two types of air disturbance prior to sampling. Either an aggressive technique, using a leaf blower and oscillating fans to disturb the air, or a modified-aggressive technique, using only oscillating fans to disturb the air was used. In several instances both methods were used in the same apartment to evaluate if there was a difference in the analytical results. Both the aggressive and modified-aggressive techniques are expected to create air disturbance over an eight-hour sampling period that represents either a worst-case or high-end (respectively) air movement in an indoor environment, which would provide a conservative estimate of the airborne asbestos concentration.
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In apartments where both methods were used, the modified-aggressive technique was used first and air samples were collected. Several days later, the aggressive technique was used and additional air samples were collected with no cleaning events occurring between sampling events.
^’Samples below the detection limit were assigned a value equal to the detection limit. Comparison of asbestos air samples that were collected using modified-aggressive and aggressive air disturbance. The samples collected using modified-aggressive air disturbance (i.e., box fans) were collected several days prior to the samples collected using aggressive air disturbance (i.e., leaf blower and box fans). The comparison does not show any trends, as the percentage of samples below the detection limit was higher for the aggressive air disturbance while the average asbestos concentration was nominally lower for the modified-aggressive air disturbance. 115
NYC-WTC_000145813
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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
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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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