NYC-WTC_000197574

NYC 9/11 Public Portal Document

(Sw« ASSOCIATES INC. 104 East 25th Street 10th FL New York, New York 10010 w'ww.atc-enviro.com 212.353.8280 Fax 212.353.8306

November 27, 2001

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 Stuyvesant High School (M477) 345 Chambers Street New York, New York 10007 ATC Project No. 15-19125-0246

Dear Mr. Ori an:

ATC Associates Inc. (ATC) is pleased to provide this report of indoor air quality (lAQ) measurements collected on November 26, 2001, at the referenced school. Tire New York City Board of Education (BOE) requested these measurements as part of a program to determine if acceptable indoor air quality is being maintained.

SCOPE OF WORK

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

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

Tenzin Namgyal and Wagdi Abdelshahid, Industrial Hygienists, 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. MiniKAE® photoionization detector (PID).

CITY_21MC100_003046096

NYC-WTC_000197574