Documentation setting dioxin action levels for indoor air and providing initial guidance on asbestos fiber concentration risk estimates.
NYC-WTC_000140651Folder label: “M.G: EPA INDOOR AIR WORKING GROUP MTGS.”
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
Tier Screening Value Basis Action I >.03 ng/m^ *Risk-based screening level Aggressive cleaning - if for residential setting levels persist, take additional (E-04 X lyr) action to reduce exposure II .001 ng/m^ (or background) .001 ng/m^ -♦ Risk based Maintain recommended - .03 ng/m^ screening level for residential (diligent wet/HEPA) cleaning setting methods -consider additional (E-04 X 30 yr) monitoring III < .001 ng/m^ (or Determination of local No further action background) background
*based on proposed dioxin cancer slope factor
Asbestos
Level Recommended actions Comments Air level: Evaluate the need to Screening value in air set at a >0.01 f/cc * remove sensitive level where short term individuals from the exposures 1 year) may environment result in exposures which ‘ contribute to Settled Dust Evaluate conditions in the level: area including Settled dust threshold is to > 100,02E representativeness of air protect to at least a 1X10"^ f/cm^ samples, fibrous glass dust risk estimate for a one year levels and loading. exposure. Air concentrations estimated for different Take actions to reduce activities using a K factors
NYC-WTC_000140651
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NYC-WTC_000140650
Table outlining risk-based screening levels for dioxins in settled dust with specific cleaning requirements for exceeding thresholds.
2 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.952
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000140649
Documentation defining action thresholds for PAHs in indoor air based on residential risk assessments and background concentrations.
1 shared topics · Same agency, volume and box · similarity 0.949
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000140648
Table establishing risk-based screening levels for polycyclic aromatic hydrocarbons in settled dust with corresponding remediation actions.
1 shared topics · Same agency, volume and box · similarity 0.946
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000140823
Table establishing Tier I, II, and III thresholds for dioxin in indoor air with associated cleaning actions.
1 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.942
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000140824
Guidelines for evaluating asbestos air levels and settled dust thresholds to determine if sensitive individuals should be removed.
2 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.938
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000140820
Table defining Tier I, II, and III action levels for PAHs in settled dust based on residential risk assessments.
1 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.934
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000151128
Report establishing health-based screening levels for the indoor environment with cross-agency representation.
3 shared non-person entities · 1 shared topics · similarity 0.964
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000164862
Document introduction describing a cross-agency group tasked with identifying contaminants and establishing health-based screening levels.
3 shared non-person entities · 1 shared topics · similarity 0.963
machine-extracted · confidence unavailable · Check page ↗3 shared non-person entities · 1 shared topics · similarity 0.931
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000162222
EPA staff distributed an environmental laboratory report to federal and city agencies on May 15, 2002.
3 shared non-person entities · 1 shared topics · similarity 0.930
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000162253
EPA proposal for asbestos clearance criteria applied to WTC indoor cleanup operations.
2 shared non-person entities · 1 shared topics · similarity 0.929
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000164830
DEP internal memo circulating draft EPA screening level standards for asbestos, fiberglass, and silica in indoor air and settled dust for agency comment.
2 shared non-person entities · 1 shared topics · similarity 0.929
machine-extracted · confidence unavailable · Check page ↗Similar subjects in other documents. Similarity does not establish the same event, measurement or conclusion.
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NYC-WTC_000140640
Notice instructing staff to preserve original World Trade Center documents as potential evidence in future legal actions against the City.
Filed in the same folder
NYC-WTC_000140641
Agenda for a meeting discussing status of activities, public requests, and development of sampling and cleaning plans for WTC debris.
Filed in the same folder
NYC-WTC_000140642
Introduction to a cross-agency group tasked with identifying contaminants of concern and establishing health-based screening levels for the indoor environment.
Filed in the same folder
NYC-WTC_000140643
Documentation describing the methodology for identifying contaminants of concern using historical data and qualitative toxicity screens.
Filed in the same folder
NYC-WTC_000140644
Summary of contaminants removed from the review list due to being non-detectable or found only in trace amounts, including all VOCs.
Filed in the same folder