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NYC-WTC_000208082
Label derived from the City's folder field. The City does not supply document titles.NYC-WTC_000208082–000208083Page image
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OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan August 5, 2002 Air Sampling for Silica Page? P. S. 89 (Manhattan) ATC Project No. 15-19125-0297
The sample (S2) contained 0.005 milligrams of silica per cubic meter of air (mg/m^). The amount of quartz in this samples was 28%, therefore the PEL for this dust would be:
lOmg/m^ = O.333mg/m^ 28 + 2
The silica concentration in this sample was 1.5 % of the calculated PEL.
The OSHA 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 extension 298 if you have any questions.
Sincerely, ATC Associates, Inc. Reviewed by:
Wagdi Abdelshahid James R. Cohn, CIH, CSP Industrial Hygienist Regional Manager Industrial Hygiene Division
Attachment
CITY_21MC100_003019095 NYC-WTC_000208083
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NYC-WTC_000208083Source: NYC Law Department, mirrored locally
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