Official directive instructing staff to retain specific scanned WTC documents as evidence for potential future litigation against the City.
NYC-WTC_000163229–000163230Folder label: “E-mails M. Gilsenan”
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
Determination of .0009f/cc as clearance value for asbestos air monitoring
Risk Assessment
The IRIS inhalation unit risk for asbestos is 2.3 E-01 per f/cc. Here's how this unit risk is interpreted. Exposure over a lifetime (i.e., 70 yrs) to 1 f/cc of asbestos results in a cancer risk of 2.3 E-1. To get the fiber concentration equating to a 1 E-04 (one-in ten thousand risk - for lifetime exposure) the following equation is used:
J3= ,0001 1 f/cc X
x = «l .23
m:4 f/cc this is the fiber concentration that equates to a 1 E-04 risk for 70 year exposure. x = .1
To adjust the exposure duration to 30 years, multiply .0004 f/cc by 70 =;5529 f/cc 30
Analytical Methods
PCM NIOSH 7400 followed by AHERA TEM analysis should be used on all samples. AHERA TEM measures all fibers > .5 um. Additionally, the lab should record all fibers that are > 5 um to determine the PCMe value.
PCMe is determined by counting all fibers > 5 um with a 3:1 aspect ratio by TEM analysis. In our PCMe calculations we are using a conservative approach of counting all fibers >5um.
Therefore, the analytical result of fibers >5 um will be compared to 9 f/cc to measure success in achieving the clearance value.
Sampling Approach
Air sampling pumps with a maximum flow rate of 15 liters per minute should be used along with sample cassettes with mixed cellulose ester filters having a pore size of .8 um. The minimum sampling volume required is 3600 liters to achieve the clearance criteria.
NYC-WTC_000163230
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NYC-WTC_000162403
Correspondence adjusting salary and travel budget figures for EPA oversight of cleaning contractors.
1 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.960
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000163599
Draft screening levels for asbestos, fiberglass and silica in indoor air and settled dust.
2 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.923
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.
1 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.919
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000162838
Correspondence regarding Schedule A forms and a draft scope of work for cleaning and air monitoring contracts at the site.
2 shared non-person entities · Same agency, volume and box · similarity 0.917
machine-extracted · confidence unavailable · Check page ↗2 shared non-person entities · 1 shared topics · similarity 0.998
machine-extracted · confidence unavailable · Check page ↗2 shared non-person entities · 1 shared topics · similarity 0.990
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.
2 shared non-person entities · 1 shared topics · similarity 0.928
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.
1 shared non-person entities · 1 shared topics · similarity 0.924
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000154652
Internal tracking document for managing reports, comments, and actions related to environmental compliance cases.
1 shared non-person entities · 1 shared topics · similarity 0.919
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000149346
A chain of custody cover sheet for air monitoring samples sent to the EPA Region 1 laboratory in January 2003.
2 shared non-person entities · 1 shared topics · similarity 0.918
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000107277
Transmission journal record confirming receipt of asbestos and lead analysis data on November 14, 2002.
1 shared non-person entities · 1 shared topics · similarity 0.918
machine-extracted · confidence unavailable · Check page ↗1 shared non-person entities · 1 shared topics · similarity 0.918
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NYC-WTC_000163228
Official notice instructing staff to preserve scanned World Trade Center documents as potential evidence in future legal actions.
Filed in the same folder
NYC-WTC_000163231
Interdepartmental comments from NYCDOH and NYSDOH on draft Statements of Work for WTC contracts.
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NYC-WTC_000163234
EPA correspondence clarifying regulatory agency roles, asserting NYC Department of Health holds primary authority for mold remediation in WTC recovery.
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NYC-WTC_000163238
EPA transmission of finalized Scopes of Work for indoor dust cleaning and environmental monitoring components of recovery program.
Filed in the same folder
Filed in the same folder