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NYC-WTC_000199252

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NYC 9/11 Public Portal Document

104 East 25th St., 10th Fl Now York, New York 10010 www,alc-eriviro.com 212,353,8280 Fax 212 353 8306 ASSOCIATES INC.

October 2, 2002

Mr. Bernard P. Orlan Director, Environmental Health & Safety New York City Depart nent of Education 28-11 Queens Plaza North Long Island City, NY 11101 -4008

Re: Wipe Samples for Dioxins P. S. 131M ATC Project No. 15-19125-0346

Dear Mr. Orlan;

ATC Associates Inc. (ATC) is pleased to provide this report of the results of the wipe samples for polychlorinated dibenzo-p-dioxins (PCDDs)and dibenzofurans (PCDFs) collected on August 23, 2002 at the referenced location. The New York City Department of Education (DOE) requested these sample; to evaluate possible contamination in the school building.

SCOPE OF WORK

The samples were collected using gauze pads and hexane as a solvent. The pads and solvent were provided and simples were analyzed by Pace Analytical Services, Inc. (Pace) of Minneapolis, MN, a laboratory experienced in dioxin analysis. The analysis was performed by modified EPA Method 8290 using combined capillary column gas chromatography/high resolution mass spectrometry.

Tenzin Namgyal, Industrial Hygienist of ATC’s New York City office, collected the samples consistent with generally accepted industrial hygiene practices. There were inherent limitations created by constraint; of time, operational and work practice variability, variations in contaminant concentra ions, and sampling and analytical accuracy. The results of the sampling represent conditions fornd on the date the samples were collected.

WIPE SAMPLING RESULTS

ATC submitted three (3) wipe samples and one blank for PCDDs/PCDFs to Pace for analysis. A copy of the laboratory analysis report is provided in the Attachment, within the pharmacy area One sample was taken from each floor of the building. The area of each sample one (1) square meter (lm2).

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.

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NYC-WTC_000199252

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NYC-WTC_000199252Source: NYC Law Department, mirrored locally

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