PCDD/PCDF wipe sample results, July 1, 2002

NYC 9/11 Public Portal Document

Mr Bernard P. Orlari July 1,2002 Wipe Samples for Di oxins Page 2 iii SrfoiJ±?^leriihip & PublicSeryice(894W ATC Project No. 15-19125-0290

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) __________ May 17, 2002__________

1st Floor Main Lobby - Floor /DXl 0.00036 5th Floor Hallway by Elevator - Floor 0.00048 ______________ /DX2______________ IQth Floor Hallway by Elevator - Floor 0.00027 /DX3

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 0.00027 to 0.00036 nanograms per square meter (ng/m^). The levels found in all of these samples are below the NYSDOH guideline of 25 ng/m^.

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, A TC ASSOCIA TES INC.

Reviewed By:

1 / < / Yiannis Efstathiou James R. Cohn, CIH, CSP Senior Project Manager Regional Manager Industrial Hygiene Division

Attachment

CONFIDENTIAL, CITY_21MC1OO_OO3432O78 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175641