NYC-WTC_000187677

NYC 9/11 Public Portal Document

104 East 25n, St, lOtf floor New York, New York 10010 www.atc-enviro.com 212.353.8280 Fax 212 353.6'306 ASSOCIATES INC.

March 19, 2002

Mr. Bernard P. Orlan Director, Environmental Health & Safety New York City Board of Education 28-11 Queens Plaza North l.ong 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 March 18, 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-oecupancy.

SCOPE OF WORK

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

ATCi 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 RAE Systems, Inc. MiniRAE® photoionization detector (PID).

Mr. Jimmy Choy, Industrial Hygienist 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_21MC1OO_OO2954252

NYC-WTC_000187677