DOH/DEP asbestos fact sheet draft, 105 Duane Street

NYC 9/11 Public Portal Document

DEC-12-2001 14:50 RELATED MANAGEMENT CO. P.03/10

v ATC v

Ambient Air Sampling ASSOCIATES INC.

Fib In Air via PCM analyzed for Twelve ambient air samples collected within the common areas lobby were method. All samples collected fiberglass using the Phase Contrast Microscopy (PCM) analytical recorded fiber levels less than 0.01 f/cc In the absence of a specific ambient air standard for fiberglass, ATC has selected as a criteria following an for acceptable ambient air sample sets, the NYCDEP re-occupancy requirement (o.ol 0,01 fibers per cubic centimeter asbestos abatement action of an average of less than f/cc2). concentrations In conclusion, based upon the analytical results for fiberglass recording fiber action, it is below the NYC acceptable airborne clearance requirement following an abatement ATC's opinion that the ambient air samples collected throughout the building meet an acceptable criterion for re-occupancy

PCB's in Air analytical One ambient air sample collected within the lobby and analyzed for PCB's recorded results less than analytical detection limit.

Indoor Air Quality The IAO evaluation included collection of seventy-five real-time measurements of temperature, relative humidity, carbon dioxide (CO2), carbon monoxide (CO), respirable particulates and total volatile organic compounds (TVOC). Currently, there are no regulatory standards for indoor air quality in non-industrial buildings, such as residential units. For the real-time data collected, ATC uses the commonly accepted guidelines cited in the following publications: Ventilation for Acceptable Indoor Air Quality (ASHRAE 62-1999). American Society of Heating. Refrigerating, and Air-Conditioning Engineers (ASHRAE): Thermal Environmental Conditions for Human Occupancy (ASHRAE 55-1992); Industrial Hygienists Guide to Indoor Air Quality Investigations (1993), American Industrial Hygiene Association (AIHA).

PARAMETER TARGET LEVEL AGENCY OR ORGANIZATION Carbon Dioxide <700 parts per million (ppm) ASHRAE 62 CO above background level Carbon Monoxide 9 ppm USEPA NPAAQS (as cited in CO ASHRAE 62) Respirable Particles 50 micrograms per cubic USEPA NPAAQS (as cited in (PM10) meter of air /m3 ASHRAE 62) Temperature Summer: 73-79°F at 50% RH ASHRAE 55 Winter. 68-75°F at 50% RH Relative Humidity 30-60 % ASHRAE 55

NYC-WTC 000125851