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NYC-WTC_000199090
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NYC 9/11 Public Portal Document
104 East 25th St New York, New York 10010 www.atc-enviro.com 212.353.8280 Fax 212.353.8306 ASSOCIATES INC.
March 18,2002
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 Vapor P. S. 234M ATC Project No. 15-19125-0279
Dear Mr. Orlan:
ATC Associates, Inc. (ATC) is pleased to provide this letter report of air sampling for mercury vapor conducted on March 5, 2002, at the referenced school. The New York City Board of Education (BOE) requested this sampling at the recommendation of Environ Corp., a consultant to the parent’s association.
Scope of Work
ATC collected four (4) samples for mercury vapor using Carulite® (Hydrar) tubes connected to battery-powered sampling pumps calibrated to collect 0.2 liters of air per minute. Samples were collected for'ten (10) hours. Two (2) samples were collected indoors and two (2) were collected outdoors. 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.
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 days the samples were collected.
The sampling locations were: Main Entrance Lobby, 1’* Floor Hallway, West Playground and the Roof.
Results
Mercury (Hg) was detected in these samples at levels that were indistinguishable from that detected in the blank.
The established regulatory value for mercury (OSHA: O.lmg/mQ is intended for industrial workplace exposures and is not generally applicable to office/school settings. There are no standards for mercury in indoor air in non-industrial situations. The EPA has no standard or guideline for mercury’ vapor in ambient air.
CITY_21MC100_003031284
NYC-WTC_000199090
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NYC-WTC_000199090Source: NYC Law Department, mirrored locally
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