Mercury vapor air sampling report, NYC school, July 2002

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.

July 2, 2,002

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

Re: Air S ainpling for Mercury Vapor Stuyvesant High School ATC Project No. 15-19125-0246

Dear Mr. Orlan:

ATC Associates, Inc. (ATC) is pleased to provide this report of air sampling for mercury vapor conducted on June 5, 12 and 19, 2002, at the referenced school. The New York City Board of Education (BOE) requested this sampling at the recommendation of H. A. Bader, a consultant to the parents association.

Scope of Work

On each day, ATC collected three (3) samples plus one (1) blank for mercury vapor using Carulite® (Hydrar) tubes connected to battery-powered sampling pumps calibrated to collect 0.2 liters of air per minute. Two samples were collected indoors and one was collected on the roof. The samples were sent to PSC Analytical Services, Inc., an American Industrial Hygiene Association-accredited laboratory in Reading, PA. One blank tube was also submitted per day. Analysis was aerformed by means of a mercury analyzer according to NIOSH Method 6009. A copy of the analytical report is attached.

Tenzin Namgyal and Wagdi Abdelshahid, Industrial Hygienists from ATC’s New York City office, conducted the sampling. Sampling was conducted in accordance with accepted industrial hygiene practices. The results represent the conditions on the day the samples were collected.

Results

On all three days, mercury (Hg) was detected in the samples at levels that were indistinguishable from those detected in the blanks.

The results indicate that the Hg detected was a trace contaminant of the sampling medium and not the result of Hg vapor in the ambient air.

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