NYC-WTC_000223633

NYC 9/11 Public Portal Document

600 West Cummings Park. Suite 650C Woburn, Massachusetts 01801-635( www.atc- enviro.corr 781.932.940C Fax 781,932.6211 ASSOCIATES INC.

July 1, 2002

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

Re: Wipe Sample for Dioxins P. S. 150M ATC Project No. 15-19125-0289

Dear Mr. Orlan;

ATC Associates Inc (ATC) is pleased to provide this report of the results of the wipe sample for polychlorinated dibenzo-p-dioxins (PCDDs)and dibenzofiirans (PCDFs) collected on May 20, 2002, at the referenced location. The New York City Board of Education (BOE) requested this sample to evaluate possible contamination in the school building per the recommendation of Environ Corp., consultant to the parents association..

SCOPE OF WORIL

The sample was collected using a gauze pad and hexane as a solvent. The pad and solvent were provided and sample was 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.

ATC’s findings and conclusions are based on the laboratory samples results and the conditions present in the school at the time of the assessment.

Wagdi Abdelshahid, Industrial Hygienist of ATC’s New York City office, collected the sample. consistent with generally accepted industrial hygiene practices. There were inherent limitations created by constraints of time, operational and work practice variability, variations in contaminant conceritiations, and sampling and analytical accuracy. The results of the sampling represent conditions found on the date the sample was collected.

RESULTS

ATC submitted one wipe sample (plus one blank) for PCDDs/PCDFs to Pace for analysis. The sample area was one square meter (1 m2). The location sampled was the Main Entrance - Lobby.

CITY_21MC100_002919542

NYC-WTC_000223633