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NYC-WTC_000228288
Label derived from the City's folder field. The City does not supply document titles.NYC-WTC_000228288–000228289Page image
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NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan Marchis, 2002 Air Sampling for Metals Page 2 P.S. 89 (Manhattan) ATCProiectNo. 15-19125-0297
Results
The metals that were found above the limits of detection were chromium (Cr) and iron (Fe), The other metals were not detected. Cr was also detected in the blank. The table shows the locations and blank-corrected concentrations at which Cr and Fe were detected.
CHROMIUM (Cr) and IRON (Fe) CONCENTRATIONS (Blank-corrected)________________
1" Floor Hallway by Cafeteria/Ml 0.034 BDL**
Playground (north side)/M2 0.027 2.10
Playground (south side)/M3 0.065 1.72
Roof/M4 0.084 BDL
Blank/M5 0.294 ug/sample BDL * micrograms per cubic meter of air ** Below Detection Limit
The Environmental Protection Agency (EPA) has set a screening level for hexavalent chromium (the more toxic form) in air of 0.6 ug/m’, this assumes a continuous exposure for one year. The samples here were analyzed for total chromium (trivalent and hexavalent). The concentrations in these samples are below the EPA level.
The EPA has no published screening level or guideline for iron in ambient air.
ATC appreciates the opportunity to provide this indoor air quality service to the BOE. Please call me at (212) 353-8280 extension 212 if you have any questions.
Smeerely, ATC Associates,
James R. Cohn, CnTTCSr Regional Manager Industrial Hygiene Division
Attachment
CITY_21MC100_002899760
NYC-WTC_000228289
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NYC-WTC_000228289Source: NYC Law Department, mirrored locally
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