28 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.967
machine-extracted · confidence unavailable · Check page ↗Document / 246 pages
VOC sampling locations table for Ground Zero area, Jan 2002
Machine-extracted title · confidence 100%Table listing volatile organic compound (VOC) sampling sites and dates outside of Ground Zero from September 2001 to January 2002.
NYC-WTC_000148952–000149197Folder label: “NO INFO”
Page image
OCR text
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
Contaminant Site Worker Resident ® Tetrahydrofuran 200 ppm .9 ppm *5) Toluene 200 ppm 1.1 ppm Xylenes 100 ppm 1 ppm Reactive Gases Acetaldehyde 200 ppm .05 ppm (6) 1.3 ppm (5) Formaldehyde .75 ppm .04 ppm (12) ’ .35 ppm (5) Acrolein .1 ppm .0001 ppm
Units
f'cc = fibers (>5 gm length) per cubic centimeter of air S/mm2 = structures (>.5 gm length) per square millimeter of filter paper ppm = parts per million in air gg/m^ = micrograms of contaminant per cubic meter of air ng/m’ = nanograms of contaminant per cubic meter of air NA - Not Applicable
Footnotes:
1. “Site Workers” refers to all workers involved in the response/demolition of the World Trade Center. Listed values are Occupational Safety and Health Administration (OSHA) Permissible Exposure Limits (PELs), Time Weighted Averages (TWA) unless otherwise noted.
2. “Residents” refers to people living in the vicinity of the World Trade Center as well as all other potentially exposed workers not involved in the response/demolition
3. Resident screening value is based on Asbestos Hazard Emergency Response Act (AHERA) methodology which uses transmission electron microscopy (TEM), and because of its basis in “background” (vs a risk basis) includes all asbestos fibers greater than 0.5 microns in length. Worker values are based on phase contrast microscopy (PCM, - which doesn’t distinguish asbestos from other fibers) or, for results above the PCM screening value, TEM to derive a PCM equivalence that includes all asbestos fibers greater than 5 microns in length.
4. Screening values for chromium were based on the most toxic form (hexavalent)
5. EPA - Hazard Evaluation Handbook (HEH) (carcinogen) > 1 year of continuous exposure equating to an excess lifetime cancer risk of one-in ten thousand
DRAFT-DO NOT QUOTE OR CITE A-5 October 2002
NYC-WTC_000148989
OCR can misread numbers and units. Confirm readings against the page image before using them.
NYC-WTC_000148989Source: NYC Law Department, mirrored locally
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