NYC-WTC_000226955

NYC 9/11 Public Portal Document

104 East 25th Street 10th Floor New York, New York 10010-2917 212.353.8280 ASSOCIATES INC. Fax 212.353.8306

January 7, 2002

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 Sampling for Mercury Stuyvesant High School ATC Project No. 15-19125-0246

Dear Mr. Orlan;

ATC Associates, Inc. (ATC) is pleased to provide this letter report of air sampling for mercury conducted on December 20 and 26, 2001, 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. I On each day, ATC collected three (3) samples 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. Analysis was performed by means of a mercury analyzer according to NIOSH Method 6009. A copy of the analytical report is attached.

Mercury (Hg) was found at a trace level in each of the three samples. It was also detected in the blank. The tables show the mercury concentrations in the samples on each day.

TABLE 1 Airborne Mercury (Hg) Concentrations* December 20,2001

Hg-l 0.032 96 0.000333 1“ Floor. Main Lobby 0.031 96.4 0.000322 2 floor bridge lobby hF3 0.028 97 0.000289 Roof Hg-4 0.032 Blank • milligrams per cubic meter of air / Not blank corrected

CITY_2IMCl00_000490953 NYC-WTC_000226955