8 shared non-person entities · 1 shared topics · similarity 0.997
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NYC-WTC_000228415
Label derived from the City's folder field. The City does not supply document titles.NYC-WTC_000228415–000228416Page image
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NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan April 25, 2002 Air Sampling for Silica Page 2 P. S. 89 Manhattan) ATC Project No. 15-19125-0297
Both samples contained 0.0108 milligrams of silica per cubic meter of air (mg/m's. The amount of quartz in these samples was 22%, therefore the PEL for this dust would be:
lOmg/m^ = 0.417 mg/m’ 22 + 2
The silica concentration in this sample was 2.6% of the calculated PEL.
The OSHA PEL is the only regulatory standard for silica exposure, however it is intended for occupational exposure tn settings such as foundries, sandblasting, rock drilling, etc. The EPA docs 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 212 if you have any questions.
Sincerely, ATC Associates, Inc.
James R. Cohn, CM, CSP Regional Manager Industrial Hygiene Division
Attachment
CITY_21MC100_013429146
NYC-WTC_000228416
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NYC-WTC_000228416Source: NYC Law Department, mirrored locally
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