NYC-WTC_000208300

NYC 9/11 Public Portal Document

104 East 25th St., 10th Floor New York, New York 10010 www.atc-enviro.com 212.353.8280 Fax 212.353.8306 ASSOCIATES INC

November 25, 2002

Mr. Bernard P. Orlan Director.. Environment il Health & Safety New York City Department of Education 28-11 Queens Plaza Ni rth Long Island City, NY 11101 -4008

Re: Wipe Samples for Dioxins Murray Berg raum High School (M520) ATC Project No. 15-19125-0351

Dear Mr. Orlan:

ATC Associates Inc. (.ATC) is pleased to provide this report of the results of the wipe-samples for polychlorinated c!ibenzo-p-dioxins (PCDDs)and dibenzofurans (PCDFs) collected on September 11, 2002, a: 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 ana yzed by Pace Analytical Services, Inc. (Pace) of Minneapolis, MN, a laboratory experiencec! in dioxin analysis. The analysis was performed by modified EPA Method 8290 using combined capillary column gas chromatography/high resolution mass spectrometry.

Sonny Ramlal, Environmental Technician of ATC’s New York City office, collected the samples consistent with general y accepted industrial hygiene practices. There were inherent limitations created by constraint ; of lime, operational and work practice variability, variations in contaminant concentrauons, and sampling and analytical accuracy. The results of the sampling represent conditions foi ind on the date the samples were collected.

Results

ATC submitted three vipe samples for PCDDs/PCDFs (plus one blank) to Pace for analysis. Samples were taken from representative floor areas throughout the building. The sample area for each sample was one sc uare meter (1 m^). The areas sampled were:

• Main hobby; • SrcI Floor Hallway; • 5^^ Floor Hallway.

CITY_21MC100_003021591

NYC-WTC_000208300