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NYC-WTC_000202498

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NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan November 25, 2002 Wipe Samples for Dioxins Page 2 Stuyvesant High School iM477) ATC ProiectNo. 15-19125-0246

for the analytical results for each sample. A copy of the laboratory 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^) September 6,2002 LOCATION'SAMPLE ID DIOXIN CONCENTRATION ____________________________________ P' Floor Lobby Main Entrance / DXl 0.00 2’^° Floor Lobby Bridge Entrance /DX2 0.000026 H VAC 7 2/0X3 0.000040

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/m2).

The concentrations on indoor surfaces ranged from 0.00 to 0.000026 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 - TCDD equivalents detected in this sample was deposited. Dioxin samples were not collected from these locations prior to November 8, 2001, and 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.

Sincerely, ATC Associates, Inc.

/ / /

James R. Cohn, CIH, CSP Regional Manager Industrial Hygiene Division

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CITY_21MC100_003273046

NYC-WTC_000202499

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NYC-WTC_000202499Source: NYC Law Department, mirrored locally

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