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PCDD/PCDF wipe sample results, PS234M, May 2002
Machine-extracted title · confidence 95%Letter transmitting analytical results for PCDDs and PCDFs from wipe samples collected at PS234M in March 2002.
NYC-WTC_000177770–000177771Page image
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NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan May 6, 2002 Wipe Samples for Dioxins Page 2 P. S. 234 /ManhattanI ATC Project No. 15-19125-0279
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-dioxm (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. The sample locations and the results are shown in the table: DIOXIN WIPE SAMPLE RESULTS (2, 3, 7, 8 TCDD EQUIVALENTS) March 19, 2002
LOCAUONZSAMPrXNVAWEK
1st Floor Hallway - east end/DXl 0.0011
1 st Floor Hallway - west end/DX2 0,00030
DIOXIN WIPE SAMPLE RESULTS (2,3, 7, 8 TCDD EQUIVALENTS) March 26, 2002
ist Floor Hallway - east end/DXl 0.0012
1 st Floor Hallway - west end/DX2 0.00083
On March 11, the concentrations on indoor surfaces were 0.0011 and 0.00030 ng/m^. On March 26, the concentrations on indoor surfaces were 0.00083 and 0.0012 ng/m^. These levels are well 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 wipe samples were not collected from this school prior to December 6, 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, ATC ASSQfllATES
ics K.'^Cohn, CIH, CSP Regional Manager, Industrial Hygiene Division
Attachment
CONFIDENTIAL, CITY_21MC100_003444357 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008
NYC-WTC_000177771
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NYC-WTC_000177771Source: NYC Law Department, mirrored locally
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Letter transmitting analytical results for PCDDs and PCDFs from wipe samples collected at PS234M in March 2002.
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Cover letter and results for wipe samples testing polychlorinated dibenzo-p-dioxins and dibenzofurans collected at PS 234M on February 22, 2002.
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