NYC-WTC_000187665

NYC 9/11 Public Portal Document

104 East 25t-i St. lOtb Floor New York. New York 10010 wwv.'.atc-enviio com 212 353.6280 Fax 212 353 8306 ASSOCIATES INC.

March 26, 2002

Mr. Bemarc! 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. l.S-19125-0289

Dear Mr. Orlan:

ATC Associates Inc. (ATC) is pleased to provide this report of indoor air quality' (lAQ) measurements collected on March 25, 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 C'O with a Q-Trak® Model 8551, manufactured by TSI, Inc.

ATC measured concenmations of respirable particulates (PM2.5) with a Dust-Trak® Aerosol Monitor Model 8520, manufactured by TSI, Inc.

ATC measured concentrations of Total Volatile Organic Compound.s (TVOCs) using a RAE Systems, Inc. MiniRAE® photoionization detector (PID).

Mr. Jimmy Choy, Industrial Hygienist of ATC’s New York City offce, 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_002954207

NYC-WTC_000187665