8 shared non-person entities · 1 shared topics · similarity 0.995
machine-extracted · confidence unavailable · Check page ↗Document / 2 pages
NYC-WTC_000202081
Label derived from the City's folder field. The City does not supply document titles.NYC-WTC_000202081–000202082Page image
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OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan February 19, 2002 Air Sampling for Silica Page 2 P. S. 89 /Manhattan) ATC Project No. 15-19125-0297
The Room 326 sample contained 0.0127 mg/m'. The amount of quartz in this sample was 26% therefore the PEL for this dust would be:
lOmg/m' 0.357 mg/m’ 26 + 2
The silica concentration in this sample was 3.6% of the calculated PEL.
The OSPIA PEL is the only regulatory standard for silica exposure, however it is intended for occupational exposure in settings such as foundries, sandblasting, rock drilling, etc. The EPA does not have an ambient-air quality standard for silica.
ATC appreciates the opportunity to provide this indoor air quality consultative service to the BOE. Please call me at (212) 353-8280 extension212 if you have any questions.
Sincerely, ATC Associates, Inc.
James R. Cohn, CIH, CSP Regional Manager Industrial Hygiene Division
Attachment
r
CITY_21MC100_005390065
NYC-WTC_000202082
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NYC-WTC_000202082Source: NYC Law Department, mirrored locally
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