NYC-WTC_000226869

NYC 9/11 Public Portal Document

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

January 17, 2002

Mr. Bernard P. Orlan Director, Environmental Health & Safety New York City Board of Education 28-11 Queens Plaza North Long Island City, NY 11101-4008

Re: Indoor Air Quality Assessment P.S. 89M 201 Warren Street New York, New York 10282 ATC Project No. 15-19125-0297

Dear Mr. Orlan:

ATC Associates Inc. (ATC) is pleased to provide this report of indoor air quality (lAQ) measurements collected on January 16, 2002, at the referenced school at locations indicated to ATC by the Parents Association environmental consultant, Mr. Tom Fusillo of Environ.

SCOPE OF WORK

ATC conducted this evaluation to assess the basic parameters of temperature, relative humidity, carbon dioxide (CO2) and carbon monoxide (CO).

Total volatile organic compounds (TVOCs) and respirable particulates (PM2.5) were also measured.

Mr. Jimmy Choy, Industrial Hygienist of ATC’s New York City office, conducted the assessment. ATC’s findings and conclusions are based on a visual inspection, real-time environmental measurements and conditions present in the school at the time of the assessment.

ATC measured temperature, relative humidity, CO, and CO with a Q-Trak® Model 8551, manufactured by TSI, Inc.

ATC measured concentrations of respirable particulates (PM2.5) with a Dust-Trak® Aerosol Monitor Model 8520, manufactured by TSI, Inc.

ATC measured concentrations of TVOCs using a RAE Systems, Inc. MiniRAE® photoionization detector (PID).

CITY_21MC100_000490543 NYC-WTC_000226869