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NYC-WTC_000196831
Label derived from the City's folder field. The City does not supply document titles.NYC-WTC_000196831–000196834Page image
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NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan * January 8, 2003 Air Sampling for Hydrocarbons, Metals, Mercury & Silica Page 4 P. S. 89(Manhattan) ATC ProiectNo. 15-19125-0297
SILICA SAMPLE RESULTS
Silica was not present above the limit of detection (<10 micrograms per sample) in any of the samples.
The Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (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 Environmental Protection Agency (EPA) does not have an ambient-air quality standard or guideline for silica.
CONCLUSIONS
The chromium concentrations detected that were higher than the blank average were below the EPA screening level.
A-Hydrocarbons was detected in one sample below the significant amount. No other hydrocarbons, mercury and silica were not detected in these samples.
ATC appreciates the opportunity to provide this indoor air quality service to the DOE. Please call (212) 353-8280 extension 370 or 212 if you have any questions.
Sincerely, ATC Associates, Inc. Reviewed by:
iZ.
Tenzin b^ipgyal James R. Cohn, CIH, CSP Industri aPHygienist Regional Manager Industrial Hygiene Division
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NYC-WTC_000196834
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NYC-WTC_000196834Source: NYC Law Department, mirrored locally
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