NYC-WTC_000202139

NYC 9/11 Public Portal Document

Satc 104 East 25th St., 10th Floor New York. New York 10010 www.atc-enviro.com 212.353.8280 Fax 212.353.8306 AS so C I AT E S INC.

March 12, 2G02

Mr. Bernard P. Orlan Director, Environmental Health & Safety New York City Board of Education 28-T1 Queens Plaza North Long Island City, NY 11101-4008

Re: Indoor Air Quality Assessment P.S.89M 201 Warren Street New York, New Yorkl0282 ATC ProjectNo. 15-19125-0297

Dear Mr. Orlan:

ATC Associates Inc. (ATC) is pleased to provide this report of indoor air quality (lAQ) measurements collected on March 11,2002, at the referenced school. The New York City Board of Education (BOE) requested these measurements to evaluate air quality in the school building.

SCOPE OF WORK

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

ATC measured temperature, relative humidity, CO2 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 Total Volatile Organic Compounds (TVOCs) using a RAE Systems, Inc. MiniRAE® photoionization detector (PID).

Mr. Jimmy Choy, Industrial Hygienist of ATC’s New York City office, conducted the assessment.'; i

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.

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

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NYC-WTC_000202139