NYC-WTC_000196515

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.

February 27, 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 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 conducted on February 19, 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 one was 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 laboratory report is attached.

The sampling locations, as specified by the parent’s association consultant, were:

Main entrance lobby, floor hallway, west playground and the roof by the air intake.

Tenzin Namgyal and Wagdi Abdelshahid, Industrial Hygienists from ATC’s New York City office, collected the samples.

Results

Mercury (Hg) was detected in one of the indoor samples (#Hgl, Main entrance lobby) at a level that was greater than the blank. When blank-corrected, the Hg concentration is reduced to 0.00023 mg/m^, which is less than half the original concentration. Hg concentrations in the other three samples were approximately equal to or less than that found in the blank.

CITY_21MC100_003057263

NYC-WTC_000196515