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NYC 9/11 Public Portal Document
California EPA’s (CAL-EPA) Acute Risk Levels demonstrates that the benchmark levels developed are categorically more stringent than the Cal-EPA’s analogous acute levels.
Developing Risk-Based Criteria for Dust
Wipe sampling is a common technique used to estimate the amount of exposure that occurs from contact with contaminated surfaces. There is no established national guidance, and very little scientific literature, for the estimation of risks from wipe samples. The EPA approach used in this report was developed by the EPA Superfiind program, and is consistent with evaluations found in literature. The approach involves analyzing the wipe sample for the concentration of the contaminant on the indoor surface, estimating the exposure to that contaminant concentration to determine dose in the body, and using this information to estimate risk.
Exposure to a contaminant on an indoor surface is estimated by calculating 1) the amount of the contaminant that is deposited on the skin touching the surface, 2) the fraction that is then transferred from the skin to the mouth, and 3) the fraction that is absorbed by the skin into the body. The three equations are as follows [Radian International 1999]:
1) Ds = C X SA X CF X FTSS x EF x ED
Ds = Amount of chemical deposited on skin (mg) C = Concentration of chemical on contaminated surface (mg/cm2) SA = Exposed skin surface area (cm2) CF = Contact frequency of skin against surface (1/day) FTSS = Fraction transferred from surface to skin EF = Exposure frequency (days/year) ED = Exposure duration (years)
2) Do = (Ds X FTSM x ABSo)/(BW x AT)
Do = Oral dose (mg/kg/day) FTSM = Fraction transferred from skin to mouth ABSo = Oral absorption fraction BW = Body weight (kilograms) AT = Averaging time (days)
3) Dd = (Ds X (1-FTSM) x ABSd)/(BW x AT)
Dd = Dermal dose (mg/kg/day) FTSM = Fraction transferred from skin to mouth ABSd = Dermal absorption fraction BW = Body weight (kilograms) AT = Averaging time (days)
Several assumptions are incorporated into these equations. They assume that volatilization of the
NYC-WTC_000164844
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NYC-WTC_000164862
Document introduction describing a cross-agency group tasked with identifying contaminants and establishing health-based screening levels.
16 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.969
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.
4 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.959
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000164732
Draft spreadsheet of asbestos sampling results from residential locations collected November-December 2001, circulated for review.
17 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.958
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000164784
Transmission of revised asbestos sampling results for residential samples collected November-December 2001.
17 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.957
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.
30 shared non-person entities · 1 shared topics · similarity 0.999
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000148952
Table listing volatile organic compound (VOC) sampling sites and dates outside of Ground Zero from September 2001 to January 2002.
27 shared non-person entities · 1 shared topics · similarity 0.977
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000145869
Interim final report from EPA Region 2 detailing a background study of environmental conditions at the World Trade Center site.
30 shared non-person entities · 1 shared topics · similarity 0.975
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000151128
Report establishing health-based screening levels for the indoor environment with cross-agency representation.
13 shared non-person entities · 1 shared topics · similarity 0.969
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000125845
Draft fact sheet from DOH and DEP addressing tenant concerns regarding asbestos fibers at 105 Duane Street.
21 shared non-person entities · 1 shared topics · similarity 0.963
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000154652
Internal tracking document for managing reports, comments, and actions related to environmental compliance cases.
11 shared non-person entities · 1 shared topics · similarity 0.961
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000139712
Series of emails forwarding a draft memo between DEP staff members for review and finalization.
17 shared non-person entities · 1 shared topics · similarity 0.958
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000139656
Forwarded spreadsheet compiling residential asbestos sampling results collected in November-December 2001, including Building 11 reoccupancy assessment.
16 shared non-person entities · 1 shared topics · similarity 0.958
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NYC-WTC_000148952
Table listing volatile organic compound (VOC) sampling sites and dates outside of Ground Zero from September 2001 to January 2002.
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A letter from Capital Properties submitting additional air quality monitoring results for Broadway and Trinity Place buildings to the DEP.
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Document defining indoor air quality terms such as acid aerosols and action levels for radon remediation.
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NYC-WTC_000145869
Interim final report from EPA Region 2 detailing a background study of environmental conditions at the World Trade Center site.
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NYC-WTC_000150408
Memorandum regarding the FBI releasing vehicles from Ground Zero to Fresh Kills Landfill for investigation purposes.
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