Dioxin Wipe Sample Report, PS 89M, Jan 2002

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan .January 10, 2002 Wipe Sampling for Dioxins Page 2 P. S. 89 (Manhattan) ATC Project No. 15-19125-0297

Combustion of PCB-containing oils, such as during an electrical transformer fire, is known to produce dioxins. Burning of some plastics may also produce dioxins. Dioxins are toxic and are considered to be carcinogenic.

The Environmental Protection Agency (EPA) or the Occupational Safety and Health Administration (OSHA) has not established a standard for dioxin on surfaces. The EPA has a residential clean-up goal of 1 part per billion (ppb).

The New York State Department of Environmental Conservation (NYSDEC) has set 0.0006 parts per million (ppm) as the allowable concentration of dioxin in soil.

WIPE SAMPLING RESULTS

ATC submitted ten (10) wipe samples for PCDDs/PCDFs (plus one blank) to Pace for analysis. A copy of the laboratory report is provided in Attachment 1. Samples were taken from areas specified by the parents association consultant. The sample area was one square meter (m2). The sample locations and the areas are shown in the table as well as the results

Each sample was analyzed for sixteen (16) PCDD/PCDF 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 (See Attachment). This provides a single value (in nanograms) for the analytical results for each sample.

DIOXIN WIPE SAMPLE RESULTS (2, 3, 7, 8 TCDD EQUIVALENTS) ■

LOCATION/SAMPl Room 501-Table/DXl 0.0038

Library 517-Table/DX2 0.00070 Room 526-Floor/DX3 0.0014 Gymnasium-Fl oor/DX4 0,0013 Room 310-Floor/DX5 0.00085 2nd Floor Hallway/DXb 0.0018 Auditorium-Floor/DX7 0.0038

Cafeteria-Floor/DX8 0.0011 Main entrance lobby/DX9 0.032 Room 228/ DXIO 0.0016

Field Blank/DXll 0.00

CONFIDENTIAL, CITY_21MC1OO_OO3474138 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177717