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 0.976
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EPA interim final report on WTC background study, April 2003
Machine-extracted title · confidence 100%Interim final report from EPA Region 2 detailing a background study of environmental conditions at the World Trade Center site.
NYC-WTC_000145869–000146029Folder label: “INTERIM FINAL April 2003”
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NYC 9/11 Public Portal Document
APPENDIX D Assessing Exposures to Indoor Air and to Residues on Indoor Surfaces
Introduction
The purpose of this Appendix is to provide further details on how procedures were selected to estimate exposure to indoor air and to residues on indoor surfaces in residences impacted by the WTC attack.
Indoor Air Deriving clearance criteria for air samples was completed by using methods described in EPA’s “Risk Assessment Guidance for Superfund” [RAGS, 1989]. These methods were developed to assess the risk from contaminants at Superfund sites. The clearance criteria were calculated using the formula below:
Clearance criteria = (TR x AT) / (ED x EFx lUR)
where:
TR = Target Risk EF = Exposure Frequency AT = Averaging Time - Carcinogens lUR = Inhalation Unit Risk ED = Exposure Duration
Target Risk The target risk identified for these calculations was 1 x 10-4. Appendix C explains the rationale for this value.
Averaging Time - Carcinogens For non-carcinogens, AT is the exposure duration expressed in days. For carcinogens, exposure is averaged over a 70-year lifetime (the factor on which the cancer slope factors are based), and the AT is 70 years, in days (25,550).
Exposure Duration A value of 30 years is assumed to match upper bound estimate of time in a residence (EPA, 1997b).
Exposure Frequency A value of 365 days/year is used to represent a full time resident.
Inhalation Unit Risk The upper-bound excess lifetime cancer risk estimated to result from continuous exposure to an agent at a concentration of 1 pg/m^ in air. The interpretation of unit risk would be as follows: if unit risk = 1.5 x 10 ® pg/m’, 1.5 excess tumors are expected to develop per 1,000,000 people if exposed daily for a lifetime to 1 pg of the chemical in 1 cubic meter of air. The inhalation unit risk values used in the calculations are 2.3 E-01 for asbestos (IRIS, 2002), 2.86 E +05 for dioxin (Dioxin Reassessment, EPA, 2001), and 7.3 E+0 for PAHs (IRIS, 2002).
NYC-WTC_000145999
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NYC-WTC_000145999Source: NYC Law Department, mirrored locally
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Forwarded spreadsheet compiling residential asbestos sampling results collected in November-December 2001, including Building 11 reoccupancy assessment.
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Draft compilation of asbestos air samples collected from residential areas November-December 2001 by NYC DOH and ATSDR.
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Draft fact sheet from DOH and DEP addressing tenant concerns regarding asbestos fibers at 105 Duane Street.
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Transmission of revised asbestos sampling results for residential samples collected November-December 2001.
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Internal tracking document for managing reports, comments, and actions related to environmental compliance cases.
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