NYC-WTC_000202416

NYC 9/11 Public Portal Document T

104 East 25th St., 10th Floor New York, New York 10010 www.atc-enviro.com 212.353.8280 ASSOCIATES INC. Fax 212.353.8306

November 5, 2002

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

Re: Respirable Particulate Sampling P.S. 150M ATC Project No. 15-19125-0289

Dear Mr. Ori an:

ATC Associates Inc. (ATC) is pleased to provide this report of respirable particulate I \ sampling conducted on October 28-29, 20G2, af the referenced school: The New York City Department of Education (DOE) requested this monitoring to verify that acceptable indoor air quality is being maintained.

SCOPE OF WORK

ATC conducted this evaluation to assess the concentration of respirable particulates (iPMj s) within the building. NY

One (1) sample for respirable particulates (PM, 5) was collected for twenty-four (24) hours using a Micro Environmental Monitor® (MEM®), manufactured by SKG, IncvThe sample was collected -on a pre-weighed PVC filter supplied and analyzed by PSC Analytical Services, Inc., an American Industrial Hygiene Association-accredited Jaboratory in Reading, PA. A copy of the analytical laboratory report is attached.

Tenzin Namgyal, Industrial Hygienist of ATC’s New York City office, eonducted tlie sampling consistent with generally accepted'indoor air quality assessment practices. The result of the sampling represents conditions found on the date the sample was collected. ■

EVALUATION CRITERIA

Currently, there are no regulatory standards for indoor air quality in non-industrial buildings, such as offices and schools. - 1 ; 1 •I

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NYC-WTC_000202416