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NYC-WTC_000197665
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NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan June 10, 2002 Air Sampling for Silica Page 2 Stuyvesant High School ATC Project No. 15-19125-0246
The fomiula for calculating the PEL is found in 29 CFR 1910.1000, Table Z-3. The formula is:
lOmg/m^ %SiO2 + 2
The amount of quartz in this sample was <20%, therefore the PEL for this dust would be:
lOmg/m^ = 0.455 mg/m' 20 + 2
The silica concentration in this sample was 2.70% 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 (212) 353-8280 extension 212 or 290 if you have any questions.
Sincerely, ATC Associates, Inc.
Reviewed By:
Prasad Doddapaneni ' James R. Cohn, CIH, CSP Senior Project Manager Regional Manager Industrial Hygiene Division
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CITY_21MC1OO_OO3O46936 NYC-WTC_000197666
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NYC-WTC_000197666Source: NYC Law Department, mirrored locally
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