NYC-WTC_000196825

NYC 9/11 Public Portal Document

104 East 25th St., 10th Floor

ASSOCIATES TC INC. New York, New York 10010 www.atc-enviro.com 212.353.8280 Fax 212.353.8306

November 25, 2002

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

Re: Wipe Samples for Dioxins Benjamin Altman School (P. S. 42 Manhattan) ATC Project No. 15-19125-0342

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 September 4, 2002, at the referenced location. The New York City Department of Education (DOE) requested these samples to evaluate possible contamination in the school building.

Scope of Work

The samples were collected using gauze pads and hexane as a solvent. The solvent was provided and samples 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.

Wagdi Abdelshahid, 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 constraints of time, operational and work practice variability, variations in contaminant concentrations, and sampling and analytical accuracy. The results of the sampling represent conditions found on the date the samples were collected.

Results

ATC submitted three wipe samples for PCDDs/PCDFs to Pace for analysis. Samples were taken from representative floor areas throughout the building. The sample area for each sample was one square meter (1 m2). The areas sampled were:

• Main Lobby; • 2”d Floor by Room 207; • 3rd Floor by Room 309.

CITY_21MC100_003042979

NYC-WTC_000196825