PCDD/PCDF wipe sample results, April 5, 2002

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 f894M) 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-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 analytical laboratory report is attached.

DIOXIN WIPE SAMPLE RESULTS (2,3, 7, 8 TCDD EQUIVALENTS) March 1, 2002 ■I vnoN R illijlilij Main Lobby - Floor /DXl 0.0U14 "st^^Fioor Elevator Lobby - Floor /DX2 0.00064 1 Qlh Floor Elevator Lobby - Floor /DX3 0700

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, 4 TC ASSOCIA TES INC.

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

Attachment

CONFIDENTIAL, CITY_21MC100_003432023 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175609