PCDD/PCDF wipe sample results, May 13, 2002

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlari . May 13,2002 Wipe Samples for Dioxins Page 2 H. S. for Leadership & Public Service (894M) 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) April 5, 2002

LOCATION/SAMPLE NUMBER 1 st Floor Mam Lobby - Floor /DXl 0.00 5th FW Hall by Elevator . Floor/DX2 0.00032 10th Floor Hall by Elevator - Floor /DX3 0.00028

April 12, 2002 DIOMN CONCENTRATION LOCATION/SAMPLE NUMBER (ng/m2)"N ’ 1st Floor Main Lobby - Floor /DXl 0.0012 5th Floor Hall by Elevator - Floor /DX2 OOH 10th Floor Hall by Elevator - Floor /DX3 0.00023

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^).

On 4/3/02, the concentrations on indoor surfaces ranged from 0.00 to 0.00032 nanograms per square meter (ng/m^). On 4/12/02, the concentrations on indoor surfaces ranged from 0.00023 to 0.0012 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 - TODD 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.

rieAArgd Etyf

Amel Javaly James R. Cohn, CIH, CSP Senior Project Manager Regional Manager Industrial Hygiene Division

Attachment

CONFIDENTIAL, CITY_21MC100_003431948 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175605