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NYC-WTC_000182782
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NYC 9/11 Public Portal Document f
104 East 25th Street New York. New York 10010 www.atc-enviro.com 212.353.8280 Fax 212.353.8306 ASSOCIATES INC.
December 4, 2001
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 November 16, 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.
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 perfoimed by means of a mercury analyzer according to NIOSH Method 6009, A copy of the analytical report is attached.
Mercury was found at the limits of detection in each of the three samples. It was also detected in the blank. The table shows the mercury concentrations in each sample.
Airborne Mercury (Hg) Concentrations November 16,2001
0.018 Mixite- 0.000200 M-1 90 1 * Floor Main Lobby 0.017 89 0.000191 Roof 0.02 90 0.000222 2™* floor bridge lobby M-4 0.018 Blank * milligrams per cubic meter of air
CITY_21MC1OO_OO31O1398
NYC-WTC_000182782
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NYC-WTC_000182782Source: NYC Law Department, mirrored locally
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