14 shared non-person entities · 1 shared topics · similarity 0.991
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NYC-WTC_000199062
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NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan March 1,2002 Air Sampling for Metals Page 2 P.S. 234 /-Manhattan') ATC Project No. 15-19125-0279
Results
Chromium (Cr) was the only metal detected in all four samples and in the blank. Aluminum (Al) was detected in one sample and and iron (Fe) was detected in two samples. Blank-correcting the Cr levels substantially reduces the airborne concentrations
The results are shown in the following table:
METALS IN AIR CONCENTRATIONS FEBRUARY 19, 2002
(ug^m
Main Lobby / Ml 0.477 0.019 *BDL 2.10 1“ floor Hallway / M2 0.599 0.142 BDL BDL West Playground/ M3 0.533 0.076 2.70 3.05
Roof/M4 0.477 0.019 BDL BDL Field Blank/M5 ug/sample _________ BDL BDL * Below Detection Limit
All of the blank-corrected Cr concentrations are below the EPA screening level of 0.6 ug/m\ The EPA has no screening levels or guidelines for Al or Fe 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.
Sincerely, ATC Associates, Inc.
James R. Cohn, CIH, CSP Regional Manager Industrial Hygiene Division
Attachment
CITY_21MC100_003031042
NYC-WTC_000199063
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NYC-WTC_000199063Source: NYC Law Department, mirrored locally
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