NYC-WTC_000214362

NYC 9/11 Public Portal Document

t04 East 25th St 10th Floor New York, .Now York 10010 wwwatc enviro com 212 353 8280 Fax 212 353 8306 ASSOCIATES INC.

April 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. 150M 334 Greenwich Street New York, New York 10013 ATC Project No. 15-19125-0289

Dear Mr. Orlan:

ATC Associates Inc. (ATC) is pleased to provide this report of indoor air quality (lAQ) measurements collected on April 16, 2002, at the referenced school. The New York City Board of Education (BOE) requested these measurements to evaluate air quality in the school building prior to re-occupancy.

SCOPE OF WORK

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

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 Total Volatile Organic (Compounds (TVOCs) using a R,AE Systems, Inc. MiniRAE® photoionization detector (PID).

Mr. Jimmy Choy, Environmental Technician, 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.

CITY_21MC100_002870386

NYC-WTC_000214362