NYC-WTC_000221485

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan June 7, 2002 Wipe Samples for Dioxins Page 2 P. S. 89 (Manhattan) ATC Project No. 15-19125-0297

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 2, 2002

LOCATION/SAMPLE NUMBER 1st Floor Hallway-north/DXl 6^06664^ 1st Floor Hallway-south/DX2 0.000039 2nd Floor Hallway-south/DX3 0.000031

May 9,2002

LOCATION/SAMPLE NUMBER ist Floor Hallway-north/DXl 0.000040 1st Floor Hallway-southfDX2 0.0014 2nd Floor Hallway-south/DX3 0.00035

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 5/02/02, the concentrations on indoor surfaces ranged from 0.000031 to 0.000048 nanograms per square meter (ng/m^). On 5/09/02, the concentrations on indoor surfaces ranged from 0.000035 to 0.0014 nanograms per square meter (ng/m2). The dioxin concentrations in all of these sample are below the NYSDOH guideline.

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 December 20, 2001.

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, >1TC ASSOCJA TES INC.

'oject Manager

Attachment

CITY_21MC100_002887889

NYC-WTC_000221486