30 shared non-person entities · 1 shared topics · similarity 0.999
machine-extracted · confidence unavailable · Check page ↗Document / 17 pages
Environmental lab report distribution, May 2002
Machine-extracted title · confidence 90%EPA staff distributed an environmental laboratory report to federal and city agencies on May 15, 2002.
NYC-WTC_000162222–000162238Folder label: “E-mails 2002 M. Gilsenan”
Page image
OCR text
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
Asbestos
Tier Action Asbestos (settled dust) Asbestos (indoor air) Screening Basis Screening Basis Value Value I Aggressive > 100,000 Risk-based > 0.0004 f/cc * Risk-based cleaning. If levels fi'cm? screening level screening level persist, tai® for residential for short term additional action to setting (E-04 x 1 exposures (< = reduce exposure. yr) 1 yr) may result in exposures which contribute to long-term risk n Maintain 10,000 to Risk- based NYC *Risk- based recommended 100,000 f/cm2 screening level background to screening level cleaning methods. for residential 0.0004 f/cc * for residential Consider additional setting (E-04 x setting (E-04 x monitoring 30 yr) 30 yr). ni No further action <or = <or = NYC required. backgroimd or backgroimd 1 552 £'cm2 * f/cc = fibers (greater than 5 micrometers long) per cubic centimeter of air. Note that fibers and structures are used interchangeably in this report.
For asbestos in indoor air, the Asbestos Hazard Emergency Response Act (AHERA) standard of 70 structures per square millimeters (S/mm2), as measured by Transmission Electron Microscopy (TEM) analysis, has been used since the 1980s to confirm effective abatement of asbestos-containing material in schools. The standard represented the highest detectable level of background contamination on blank filters at the time (in the 1980s), not a risk-based analysis.
In order to develop risk-based benchmarks for this report, the AHERA standard was compared to a risk-based approach called Phase Contrast Microscopy (PCM). PCM was used for airborne asbestos analysis in most of the occupational epidemiology studies that provide robust dose-response data on asbestos-related carcinogenesis. AHERA’s TEM fiber counts were converted to structures that would be visualized had the analysis been done by PCM. It should be noted that the correlation between total PCM fiber and TEM fiber counts is very uncertain and is likely to vary from one venue to another; therefore, no standard conversion factor exists for these two measurements.
The process for estimating cancer risk based on the AHERA standard includes 1) harmonizing the standard (TEM counts) with the dose-response metric (PCM counts); 2) converting units of
NYC-WTC_000162231
OCR can misread numbers and units. Confirm readings against the page image before using them.
NYC-WTC_000162231Source: NYC Law Department, mirrored locally
Related records
Browse subjects →Ranked by indexed similarity. Reasons describe shared subjects and filing context; check the source records.
Same-box records
No available related records indexed in this group.
Filed elsewhere
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 0.978
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 0.976
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.
16 shared non-person entities · 1 shared topics · similarity 0.969
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 0.962
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 · similarity 0.960
machine-extracted · confidence unavailable · Check page ↗16 shared non-person entities · 1 shared topics · similarity 0.958
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 · similarity 0.958
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
machine-extracted · confidence unavailable · Check page ↗More like this page
Similar subjects in other documents. Similarity does not establish the same event, measurement or conclusion.
Page similarity is temporarily unavailable or this page has no indexed vector.
Others also read
Readers open these alongside this record — through an Ask answer, the same folder, or indexed similarity. Not a claim they are about the same event.
NYC-WTC_000148952
Table listing volatile organic compound (VOC) sampling sites and dates outside of Ground Zero from September 2001 to January 2002.
Cited alongside this record in an Ask answer
A DEP report describing ambient outdoor air monitoring for asbestos in Lower Manhattan following the World Trade Center disaster.
Cited alongside this record in an Ask answer
NYC-WTC_000145869
Interim final report from EPA Region 2 detailing a background study of environmental conditions at the World Trade Center site.
Cited alongside this record in an Ask answer
NYC-WTC_000146129
Correspondence from NYC Corporation Counsel providing comments on excerpts of a draft EPA evaluation report regarding the WTC response.
Cited alongside this record in an Ask answer
NYC-WTC_000149199
Department of Environmental Protection advisory letter dated October 25, 2001, addressed to residents of Lower Manhattan.
Cited alongside this record in an Ask answer