NYC-WTC_000197415

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan May 22, 2002 Wipe Samples for Dioxins Page 2 H. S. of Economics & Finance (M833) ArCProiectNpM549125;0291

DIOXIN WIPE SAMPLE RESULTS (2,3, 7, 8 TCDD EQUIVALENTS) - Nanograms per square meter (ng/m^)

April 6,2002

Main Lobby/DXl 5th Floor Hall by Stair B/DX2 0.00U62

10th Floor by Stair B/DX3 0.00068

AprU20,2002

Main Lobby/DXl 5^h Floor Hall by Stair B/DX2 0.0018 10th Floor by Stair B/DX3 0.0029

April 27,2002

Main Lobby/DXl 5th Floor Hall by Stair B/DX2 0.000078

lOth Floor by Stair B/DX3 0.00048

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 ng m-.

On April 6, the concentrations on indoor surfaces ranged from 0.00027 to 0.00068 ng/m^. On April 20, the concentrations on indoor surfaces ranged from 0.000037 to 0.0018 ng/m^. On April 27, the concentrations on indoor surfaces ranged from 0.00 to 0.000078 ng/m^. The levels found in all 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 this school prior to January 14, 2002.

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NYC-WTC_000197416