31 shared non-person entities · 1 shared topics · similarity 0.988
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WTC environmental health assessment draft, May 2002
Machine-extracted title · confidence 95%Draft assessment summarizing eight months of monitoring data regarding air, dust, and water contaminants at the WTC site and surrounding areas.
NYC-WTC_000176160–000176183Page image
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OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
level was based on the K factor for a worst case scenario of a high level of activity. Although K factors are based on activity data for asbestos, they are believed to be protective for larger insulation wool fibers that are less airborne. In addition, although K factors are not rigorous enough to rely upon for a firm health decision, they are used here only to define what might constitute elevated fiber counts, that would need to be addressed as a near-term concern. This approach may overestimate potential exposures, but as such, is protective.
The Tier I level for insulation wools in indoor air was based on the American Conference of Governmental Industrial Hygienists’ (ACGIH) threshold limit value (TLV) of 1 f/cc. That TLV is based on limiting irritant effects of fibrous glass. The TLV was then reduced by a factor of 10 to account for uncertainty in applying ACGIH’s worker standards to a non-worker population.
The Tier HI level for insulation wools in indoor air was based on the ACGIH TLV of 1 f/cc, reduced by a factor of 100 to account for 1) uncertainty in applying the worker standard to a non worker population; and 2) weighting exposure over daily and long-term exposures.
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CONFIDENTIAL, CITY_21MC100_003423802 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008
NYC-WTC_000176173
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NYC-WTC_000176173Source: NYC Law Department, mirrored locally
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EPA notice of chain-of-custody and benchmarks presentation for WTC Taskforce meeting on April 8, 2002.
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Draft screening levels for asbestos, fiberglass and silica in indoor air and settled dust.
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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 0.965
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.
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