NYC-WTC_000209856

NYC 9/11 Public Portal Document

Tribeca Park -400 Chambers Street ATC Project No.: 09622-0012 Related Management Company, L.P. February 15, 2002 Page 6

PARAMETER TARGET LEVEL AGENCY OR ORGANIZATION

Carbon Dioxide <700 parts per million (ppm) ASHRAE 62 (CO2) 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 (PM,o) meter of air (pg/m^) 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 Total Volatile Organic 1 ppm AIHA Compounds (TVOC) USEPA = United States Environmental Protection Agency NPAAQS = National Primary Ambient-Air Quality Standard AIHA = American Industrial Hygiene Association All parameters measured during the lAQ assessment were within recommended guideline ranges.

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

Dioxins One sample twenty-four hour sample was collected using a spiked 75 mm polyurethane foam (PUF) sorbent plug and General Metal Works High Volume PSI Sampler for polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) [known collectively as dioxins] using a modified version of USEPA Method 23 (see attached analytical reports) All dioxin analyses were performed by Pace Analytical Services (see attached reports. The EPA's current screening level for dioxin in air, has been set to protect against significantly increased risks of cancer and other adverse health effects. This screening level is based on an assumption of continuous exposure for a year, to an average concentration of 0.16 nanograms per cubic meter (ng/m3) or 160 picograms per cubic meter (0.16 ng/m3 = 160 pg/m^). The sample collected and analyzed recorded a dioxin equivalence concentration of 0 0021 pg/m^, well below the EPA’s current screening level.

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