NYC-WTC_000211840

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan . April 5, 2002 Wipe Samples for Dioxins Page 2 H. S. for Leadership & Public Service (894M i ATC Project No. 15-19125-0290

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-TCDDj 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 analytical laboratory report is attached.

DIOXIN WIPE SAMPLE RESULTS (2,3, 7,8 TCDD EQUIVALENTS) March 1,2002

Main Lobby - Floor /DXl 0.0014 5^ Floor Elevator Lobby - Floor /DX2 U.U0U64 IQtb Floor Elevator Lobby - Floor /DX3 OIK}

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 0.00 to 0.0014 nanograms per square meter (ng/m2). 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 these samples were deposited. Dioxin samples were not collected from these locations prior to January 2, 2002. .

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.

James R. Cohn, CIH, CSP Regional Manager Industrial Hygiene Division

Attachment

CITY_21MC100_002865539

NYC-WTC_000211841