NYC-WTC_000214386

NYC 9/11 Public Portal Document

104 East 25th St. 10th Floc New York, New York 1001' www.atcenviro.cor 212.353.828i Fax 212 353 830! ASSOCIATES INC.

May 29, 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 May 28, 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 (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. Kevin Fitzpatrick, 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_002870646

NYC-WTC_000214386