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NYC-WTC_000219430
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NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan March 20, 2002 Wipe Samples for Dioxins Page 2 P, S. 89 (Manhattan) ATC Project No. 15-19125-0297
ATC submitted three (3) wipe samples for PCDDs/PCDFs (plus one blank) to Pace for analysis. Copies of the draft laboratory analysis results are provided in Attachment 1. Samples were taken from areas specified by the parents association consultant. The sample area was one square meter (m2).
Each sample was analyzed for sixteen (16) PCDD/PCDF isomers. The results for each isomer were then converted to 2, 3, 7, 8 -tetrachloro-dibenzo-p-dioxin (2, 3, 7, 8-TCDD) equivalents by multiplying by an established equivalency factor. This provides a single value (in nanograms) for the analytical results for each sample. The sample locations and the results are shown in the table:
DIOXIN WIPE SAMPLE RESULTS (2,3,7,8 TCDD EQUIVALENTS) __ _____ February 14,2002________
1st Floor Hallway-north/DXl o.ooW 1st Floor Hanway-south/DX2 0.00 2nd Floor Hallway-south/DX3 0.000050 Field Blank/DX4 0.0025
The concentrations on indoor surfaces ranged from 0.000050 to 0.000070 nanograms per square meter (ng/m2). The dioxin concentrations in these sample are below the NYSDOH guideline.
It is not possible to determine when the 2,3, 7, 8 - TCDD equivalents detected in these samples were deposited. Dioxin samples were not collected from these locations prior to December 20, 2001.
It is our pleasure to provide these indoor environmental services to the NYC Board of Education. If you have any questions about this report, please call (212) 353-8280, extension 212.
Sincerely, ATCASSOCIATESJNC.
James R. Cohn, CIH, CSP Regional Manager Industrial Hygiene Division
Attachment
CITY_21MC100_002880378
NYC-WTC_000219431
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NYC-WTC_000219431Source: NYC Law Department, mirrored locally
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ATC Associates report on dioxin wipe samples collected at P.S. 89M on January 31, 2002.
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