NYC-WTC_000232952

NYC 9/11 Public Portal Document

89-24-S8P-24. 20014 5:3IPMb .associates llc ID-845 948‘ SAOBNo. 1 99 9 P- 3^88/'19

Adelaide Associates, LLC 1

Scope of Services:

Adelaide Associates was contacted by Mr. Mindy Gordetsky of Asbestos Abatement Corporation (AAC) to do Indoor Air Quality testing on three floors and the main lobby of 160 Williams Street, New York. New York. Our site contact was Luis Cortes, and th® Investigation took place on September 23, 2001.

The site is currently occupied by the New York City Administration for Children Services. The request for Air Quality testing came due to complaints arising from the World Trade Center bombings.

Sampling Methodology

Real-TIme Eva I u ations;

Temperature and Humidity are measured using a Testo 451 electronic Thermometer/Hygrometer.

Carbon Monoxide samples were taken using a Kane-May direct reading instrument, electronically zeroed, and sensitive to 1 ppm of CO.

Levels measured throughout the facility were at or below 1ppm. The OSHA (workplace) Permissible Exposure Limit Is 60 ppm. The Federal Governments Public Building Service recommends a limit of 9 ppm in “non-lndustrial' areas, including general offices and day care centers. Therefore, the facility is acceptable.

Industrial Hygiana Invvtftlgtdlofit / OSHA OtunpHans^ Sarridts fAtbistos & Land Coneultfng Community Noltt AMessmaati Haardout Uaiarlal Abatement

Rjctivjj Tine Sep.24- i:2IPM

CITY_21MC100_011835482

NYC-WTC_000232953