NYC-WTC_000202351

NYC 9/11 Public Portal Document

104 East 25lh St., 10th Fl New York, New York 10010 lA'ww.afc-enviro.com 212,353.8280 Fax 212.353.8306 ASSOCIATES INC

August 29, 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 Dr. Sun Yat Sen School (P.S. 131M) ATC Project No. 15-19125-0346

Dear Mr. Orlan:

ATC Associates Inc. (ATC) is pleased to provide this report of respirable particulate sampling conducted on August 22-23, 2002, in the referenced school building. The New York City Department of Education (DOE) requested this sampling prior to the resumption of classes to verify that acceptable indoor air quality is being maintained.

SCOPE OF WORK

ATC conducted this evaluation to assess the concentrations of respirable particulates within the building.

ATC collected one sample of PMj 5 for gravimetric analysis for 24 hours using a Micro Environmental Monitor® (MEM®), manufactured by SKC, Inc. The gravimetric sample was collected on pre-weighed PVC filters supplied and analyzed by PSC Analytical Services, Inc., an American Industrial Hygiene Association-accredited laboratory in Reading, PA.

Wagdi Abdelshahid and Tenzin Namgyal, Industrial Hygienists of ATC’s New York City office, conducted the sampling. The assessment was performed consistent with accepted indoor air quality assessment practices. The results of the sampling represent conditions 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.

CITY_21MC100_003272290

NYC-WTC_000202351