NYC-WTC_000219855

NYC 9/11 Public Portal Document

104 East 25th St,. 10th Ro New York. New York 100 www.atc enviro.co 212 353.821 Fax 212 353.83( ASSOCIATES INC

May 3. 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 of Economics and Finance (M833) 100 Trinity Place New York, New York 10006 ATC Project No. 15-19125-0291

Dear Mr. Orlan;

ATC Associates Inc. (ATC) is pleased to provide this report of indoor air quality (lAQ) measurements collected on May 2, 2002 at the referenced school. The New York City Board of Education (BOE) requested these measurement.s as part of a program to determine if acceptable indoor air quality is being maintained.

SCOPEOFWORK

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.

Prasad Doddapaneni, Senior Project Manager 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® Mode! 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).

The assessment was performed consistent with generally accepted indoor air quality assessment practices. As with all such assessments, there were inherent limitations created by constraints of time, operational and work practice variability, variations in indoor air quality parameters and sampling and analytical accuracy.

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NYC-WTC_000219855