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
1.3 Development of Clearance Criteria for Lead
At the time the study was initiated, COPC benchmarks were established for all contaminants except lead. Initially, the clearance criterion used for lead was 0.1 pg/m^, which was based on an estimated national background concentration. Risk-based clearance criteria for lead in indoor air provide a means to evaluate the effectiveness of the WTC residential cleaning program. Information on background concentrations of lead in indoor air also informs attainment of cleanup objectives. Background information has been obtained from historical information on ambient air lead concentrations in urban environments, and will be further refined with data from a site specific background study being conducted as part of the WTC Dust Cleanup Program.
Primary Qearaoce Criteria Used to Determine Reoccupancy __
___ N/A Polycyclic Aromatic Hydrocarbons (PAH) 0.2 pg/m^
1 gg/n? 25pg/fe (micro vacuum comparison value 25 pg/tf) ■KI,* N/A Alpha^uartz (0.001 mg/m^ - 0,004 mg/m^ based on 0.004 mg/m^ WA analytical methods)
EPA’s risk assessment methodology for lead has been advanced through use of a biokinetic model’ that incorporates a biomarker of exposure/effect (blood lead) and multimedia exposure modeling. Through use of this model EPA identifies a goal of reducing environmental lead exposure so that 95 percent of childhood blood lead levels are below 10 pg/dl. This goal is accomplished when the airborne lead concentration is set at 1 pg/m’, and input values for all other sources of environmental lead exposure (e.g., water, soil, dust, diet) are set at background concentrations.
® U.S. Environmental Protection Agency. (September, 2002). World Trade Center Indoor Air Assessment: Selecting Contaminants of Concern and Setting Health-Based Benchmarks. Values have been excerpted from this draft report.
’U.S. Environmental Protection Agency. (Februaiy, 1994). Guidance Manualfor the Integrated Exposure Uptake Biokinetic Modelfor Lead in Children. (OSWEREPA/540/R/93/081). 6
NYC-WTC_000145704
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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
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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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