DEP memo forwarding EPA draft screening level calculations for asbestos, fiberglass, and silica in indoor air and settled dust for review.
NYC-WTC_000139634–000139637Folder label: “E-Mails Sent M. Gilsenan 2001-2002”
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
DRAFT COC Airborne Screening Levels April 1,2002 Asbestos - all types taken together Level Recommended actions Comments Air level: Evaluate the need to remove sensitiv; Screening value in air set at a level where >0.01 free * individuals from the environment short term exposures (< 1 year) may result in exposures which contribute to Evaluate conditions in the area including representativeness of air Settled dust threshold is to protect to at Settled Dust level: samples, fibrous glass dust levels and least a 1X10^ risk estimate for a one > 100,000 frem- loading. year exposure. Air concentrations estimated for different activities using a EC Take actions to reduce exposures. factors based on Millette’s work on - clean area asbestos. Risk estimate is based on - resample estimates of air levels, and duration of - ongoing cleaning exposure for different activities. (100,000frcm2 corresponds to a 3x10-5 risk for a one year exposure)
Air level: Evaluate conditions in the area For those areas where air levels would NYC background including representativeness of air not warrant removal of sensitive -0.01 f/cc* samples, fibrous glass dust levels anc individuals, but are above the 0.001 free loading. continued cleaning and evaluation is Or prudent.
Settled Dust level: If air samples were not taken, then Settled dust threshold is to protect to at appropriate air sampling should be least a 1X10"* risk estimate for a 30 year 10,000 frem- conducted to determine if fiber levels exposure. Air concentrations estimated To are elevated. for different activities using a K factors 100,000 frem- based on Millette’s work on asbestos. Take actions to reduce exposures. Risk estimate is based on estimates of ai - clean area levels, and duration of exposure for - resample different activities. (10,000frcm2 - ongoing cleaning corresponds to a 1x10-4 risk for a 30 year exposure)
Air level: No action required
< NYC background
And
Settled Dust level: < background or 1000 frem^
* Fibers with length > 5 pm with an aspect ratio 3:1, as defined in the ACGIH TLV.
NYC-WTC_000139636
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NYC-WTC_000164455
Correspondence discussing draft EPA screening levels for asbestos and silica in indoor air and settled dust during post-WTC response.
5 shared non-person entities · 1 shared topics · similarity 0.980
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.
5 shared non-person entities · 1 shared topics · similarity 0.975
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000163599
Draft screening levels for asbestos, fiberglass and silica in indoor air and settled dust.
4 shared non-person entities · 1 shared topics · similarity 0.975
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000154652
Internal tracking document for managing reports, comments, and actions related to environmental compliance cases.
3 shared non-person entities · 1 shared topics · similarity 0.951
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.
4 shared non-person entities · 1 shared topics · similarity 0.951
machine-extracted · confidence unavailable · Check page ↗4 shared non-person entities · 1 shared topics · similarity 0.949
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000140170
EPA memorandum on wipe sampling methods for asbestos in Lower Manhattan buildings, resuspension projections, and cancer risk estimates from WTC dust exposure.
3 shared non-person entities · 1 shared topics · similarity 0.948
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000151635
EPA memorandum detailing plans for asbestos wipe sampling, projecting airborne dust levels, and estimating increased cancer risks from WTC dust exposure.
3 shared non-person entities · 1 shared topics · similarity 0.947
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000140259
Memorandum detailing procedures for asbestos wipe sampling in Lower Manhattan and estimating associated cancer risks from dust exposure.
3 shared non-person entities · 1 shared topics · similarity 0.946
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000164877
Proposal detailing a survey to assess seven preliminary contaminants in 100 buildings within a four-block radius of the World Trade Center site.
3 shared non-person entities · 1 shared topics · similarity 0.946
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000162253
EPA proposal for asbestos clearance criteria applied to WTC indoor cleanup operations.
3 shared non-person entities · 1 shared topics · similarity 0.945
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000140138
EPA memorandum addressing World Trade Center asbestos contamination status and agency efforts to provide information on the situation.
3 shared non-person entities · 1 shared topics · similarity 0.944
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Instruction to retain original World Trade Center documents as evidence for potential future legal actions against the City.
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NYC-WTC_000139575
Instruction to retain original WTC documents for potential future legal actions rather than disposing of them.
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Forwarded memo containing World Trade Center phase contrast microscopy air quality test results from October 10, 2001.
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