NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan May 13,2002
Wipe Samples for Dioxin Page 2
P. S^150 (Manhattan) ATC Project No. 15-19125-0289
The 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. A copy of the laboratory analysis report is attached.
The results of the samples are shown in the following table:
DIOXIN WIPE SAMPLE RESULT
(2, 3, 7,8 TCDD EQUIVALENTS) - Nanograms per square meter (ng/m^)
April 8, 2002___________________________
1st Floor Main Entrance- Lobby/DX l 0.0012
Blank 0.000028
The New York State Department of Health (NYSDOH) established guidelines for dioxin for the
re-occupancy of the Binghamton State Office Building following a PCB fire. The NYSDOH
guideline for dioxin on surfaces is 25 nanograms per square meter (25 ng/m2). The dioxin
concentration in this sample is below the NYSDOH guideline.
It is not possible to determine when the 2, 3, 7, 8 - TCDD equivalents detected in this sample
was deposited. Dioxin samples were not collected from this location prior to December 13,
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,
ATC Associates, Inc.
Reviewed By:
Amel Javafi James R. Cohn, CIH, CSP
Senior Project Manager Regional Manager
Industrial Hygiene Division
Attachment
CONFIDENTIAL, CITY_21MC100_0 05760158
SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008
NYC-WTC_000178041
OCR can misread numbers and units. Confirm readings against the page image before using them.