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NYC-WTC_000229444
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NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan June 7,2002 Wipe Samples for Dioxins Page 2 Stuvvesant High School (M477) ATC Project No. 15-19125-0246
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. A copy of the laboratory analysis report is attached. The results are shown in the following table.
DIOXIN WIPE SAMPLE RESULTS 2, 3, 7, 8 TCDD EQUIVALENTS - Nanograms per square meter (ng/m^)
Mays, 2002________________________ LOCATION /SAMPLE ID DIOXIN CONCENTRATION
1^^ Floor Lobby 0.00037 Main Entrance / DXl 2^ Floor Lobby 0.0091 Bridge Entrance /DX2 HVAC#II/DX3 0.017
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/m^).
The concentrations on indoor surfaces ranged from 0.00037 to 0.017 nanograms per square meter (ng/m^). The levels found in all of these samples are below the NYSDOH guideline of 25 ng/m2.
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 these locations prior to November 8, 2001, and therefore a background sample is not available for comparison piuposes.
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.
f
' ‘t Senior Prmect Manager
Attachment
CITY_21MC100_003797525
NYC-WTC_000229445
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NYC-WTC_000229445Source: NYC Law Department, mirrored locally
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