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NYC-WTC_000197670

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NYC 9/11 Public Portal Document

Mr, Bernard P. Orlan December 10, 2001 Air Sampling for Silica Page 2 Stuyvesant High School ATC Project No, 15-19125-0246

The OSHA PEL is the only regulatoiy 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 212 if you have any questions.

Sincerely, ATC Associates, Inc.

James R, Cohn, CIH, CSP Regional Manager Industilal Hygiene Division

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NYC-WTC_000197671

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NYC-WTC_000197671Source: NYC Law Department, mirrored locally

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