NYC-WTC_000180110
Report of air sampling for metals conducted at the referenced school on June 22, 2002.
14 shared non-person entities · 1 shared topics · similarity 1.000
machine-extracted · confidence unavailable · Check page ↗Document / 2 pages
Air sampling report for metals at School of Economics and
Machine-extracted title · confidence 95%Letter report detailing air sampling for metals conducted on June 22, 2002, at the School of Economics and Finance.
NYC-WTC_000175558–000175559Page image
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NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan July 10, 2002 Air Sampling for Metals Page 2 U.S. of Economics & Finance (M833 ) ATC Project No. 15-19125-0291
Results
Chromium (Cr) was found above the limits of detection in all four samples and in the blanks. sample results are listed in the table:
Sample ID/ Concentration in Sample Concentration after Location (pg) Blank Correction (Pg/m’)
ATC-0622-833M-M1/ Main Lobby 0.396 0.002
ATC-0622-833M-M2 / 5'" floor by Stair 0.413 0.016 B
ATC-0622-83 3M-M3/ 9'” floor by Stair B 0.346 BDL
ATC-0622-833M-M4/ Roof 0.417 0.019
ATC-0622-833M-M5/Blank 0.415
ATC-0622-833M-M6/Blank 0.394
After blank-correction, the Cr concentration in Sample # ATC-0622-833M, ATC-0622-833M- M2, ATC-0622-833M-M3, ATC-0622-833M-M4 were lowered to 0.002, 0.016, 0.000, 0.019 micrograms per cubic meter (pg/m^) respectively.Sample # ATC-0622-833M-M6 was used for blank correction.
The Environmental Protection Agency (EPA) has set a screening level for hexavalent Cr (the more toxic form) in air of 0.6 pg/m^, this assumes a continuous exposure for one year. The samples here v'ere analyzed for total Cr (trivalent and hexavalent). These results were below the EPA’s screening level for hexavalent Cr.
Aluminum (Al) was detected in Sample # ATC-0622-833M-M4 at a concentration of 1.47 micrograms per cubic meter (pg/m^) .There is no ambient air standard or recommended screening level for Aluminum.
ATC appreciates the opportunity to provide this indoor air quality service to the BOE. Please call (212) 353-8280 extension 212 or extension 290 if you have any questions.
Sincerely, ATC Associates, Inc.
Prasad Doddapaneni James R. Cohn, CIH, CSP Senior Project Manager Regional Manager Industrial Hygiene Division Attachment
CONFIDENTIAL, CITY_21MC100_003431613 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008
NYC-WTC_000175559
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NYC-WTC_000175559Source: NYC Law Department, mirrored locally
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