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NYC-WTC_000194874
Label derived from the City's folder field. The City does not supply document titles.NYC-WTC_000194874–000194875Page image
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NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan July 3, 2002 Air Sampling for Metals Page 2 P. S. 150 (Manhattan) ATCProiectNoM5-1912S02^
RESULTS
On all sampling days. Chromium (Cr) was detected in all three samples and the blanks. Blank-correcting the Cr concentrations in the samples lowers them to below or just above the limits of detection. No other metals were detected.
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). In all the sampling days, the chromium concentrations, after blank-correction, were below the EPA screening level.
ATC appreciates the opportunity to provide this indoor air quality service to the BOE. Please call (212) 353-8280 extension 212 if you have any questions.
Sincerely, ATC Associates, Inc.
Reviewed By:
"Amel JavaM James R. Cohn, CIH, CSP Senior Project Manager Regional Manager Industrial Hygiene Division
Attachment
CITY_21MC100_004152408
NYC-WTC_000194875
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NYC-WTC_000194875Source: NYC Law Department, mirrored locally
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Letter report detailing air sampling for metals conducted on March 15, 22, and 29, 2002, at the referenced school.
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