NYC-WTC_000206766

NYC 9/11 Public Portal Document

EDNY-Vt West St., 175 Total Dust 0.261 mg/M’ 15mg/M’ (Captain ♦* In front of Cadmium <0.251 ug/M’ 5 ug/M’ N. Tower Lead ND < 1.6 ug/M’ 50 ug/M’ Zinc ND<0.0015mg/M’ 5mg/M’ Cobalt ND <0.0002 mg/M’ 0.05 mg/M’ 185 Carbon Monoxide 0 ppm (TWA) 35 ppm 22 ppm (Peak) 200 ppm 2 ppm (STEL) NA FDNY - VII West St., 183 Carbon Monoxide 0 ppm (TWA) 35 ppm Firefighter In front of 28 ppm (Peak) 200 ppm N. Tower 2 ppm (STEL) NA

Buik#l On Plaza, NA % Silica 5.1 NA from % Tridymite 0.10 NA Church St. % Asbestos 5 NA (Crysotile) Bulk # 2 Pile Near NA % Silica 23 NA Bldg #7 %Cristobalite ND <0.01 NA Is % Asbestos <1 NA

f/cc = Fibers per Cubic Centimeter TWA = Time Weighted Average PEAK = Highest Level Seen During Test PEL = Permissible Exposure Limit PESH = NYS Public Employee Safety and Health Bureau ppm = parts per million STEL = Short Term Exposure Limit mg/M’ = milligrams per cubic meter ug/M’ = microgram per cubic meter NA = Not Applicable % = Percent < == Less Than <== = Less Than or Equal To ** = Metals scan also included; Aluminum, Chromium, Copper, Iron, Magnesium, Mangenese, Molybdenum, and Nickel. AU were below detectable levels.

Analytical Method for total dust is based on NIOSH 0600 Analytical Method for silica is based on OSHAID142 and NIOSH 7500 Analytical Method for metals is based on OSHA ID 125G * = Sample result based on analytical method NIOSH 7400. This method utilizes Phase Contrast Microscopy (PCM) which counts ALL FIBERS longer than 5 microns in length and have a length to width ratio equal to or greater than 3:1. ’ == Sample result based on analytical method NIOSH 7402. This method utilizes Transmission Electron Microscopy (TEM) to identify and quantify asbestos fibers present.

CITY_21MC100_011087962

NYC-WTC_000206767