NYC-WTC_000202551

NYC 9/11 Public Portal Document

1 November 25,2002 I ■ "Wipe Samples for Dioxins 11 ;W2 Jacob Riis Comm. School fP. S. 126 Manhattan') ATCProjectNo. 15-19125-0343

Each sample was analyzed for sixteen (16) PGDDZPCDF 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 laboratoiy analysis report is attached. The results are shown in the following table.

DIOXIN WIPE SAMPLE RESULTS 2,3,7,8 TCDD EQUIVALENTS - Nanograms per square meter (ng/m^) i August 29, 2002 (’(T*\

__________ Main Lobby / DXl 0.00080

I ■ TJ'd Floor Hall by Room 317 / 0.000076 DX2 4th Moor Hall by Room 435 / 0.00044 1 17 DX3

The New York State Department of Health (NYSDOH) established guidelines for dioxin for the .1 re-occupancy of the Binghamton State Office Building following a PCB fire. The NYSDOH guideline tor dioxin on surfaces is 25 nanograms per square meter (25 ng/m2).

The concentrations on indoor surfaces ranged from 0.000076 to 0.00080 nanograms per square meter (ng/m^). The levels found in all of these samples are below the NYSDOI-l guidelme of 25 ng/m2; "• i '■ J 1 ■ It is not possible to determine when the 2, 3, 7, 8 - TCDD equivalents detected in these samples was deposited. Dioxin samples were not collected from these locations prior to these samples therefore a background sample is not available for comparison purposes. /

It is our pleasure to provide these indoor environmental services to the NYC Department of Education. If you have any questions about this report, please call (212) 353-8280, extension 212.' 1 ' ■ / >

Sincerely, ATC Associates, Inc.

Tames R. Cohn, CUI, CSP Regional Manager Industrial Hygiene Division

Attachinent

CITY_2lMC10bZ003273311

NYC-WTC_000202552