NYC-WTC_000189753

NYC 9/11 Public Portal Document

104 East 25th St 1 New York, New York 10010 wwwatc-enviro com 212 353 8280 Fax 212 353 8306 ASSOCIATES INC.

February 28, 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 High School for Leadership Public Service (M894) 90 Trinity Place New York, New York 10006 ATC Project No. 15-19125-0290

Dear Mr Orlan

ATC Associates Inc (ATC) is pleased to provide this report of indoor air quality (lAQ) measurements collected on February 27, 2002, at the referenced school. The 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 (COj) and carbon monoxide (CO)

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

Mariana Medinets, Environmental Technician, of ATC’s New York City office, conducted the assessment ATC’s findings 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, COj 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_006797805

NYC-WTC_000189753