TEM Asbestos air sample results, NYG BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYG BOE Volume (liters): 1944 Lab Group #: 5960 Filter Tvpe / Filter Area: MCE 385 mm- Lab Sample #: 5 Grid Opening Size: 0 01124 Client Sample #: Area Examined: 0.04496 mm* GREP BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: ll,/24/01

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length IC of Structure A or V EDE No (Nonadb, F B C M >=Q5p Chrys Amphibole Noraso Ambig/ND No Coord <5p Eiements)

J Struct = > Oiu > 5:1 Aspect Ratio Grid acceptance: y = Positive diffraction pattern properties conforming to “^50% undissolved filter, overlapped or folded Totals laboratory Identification criteria observed ' 10% particulate coverage >50% coverage ate least 20 unfolded or overlapped gnd squares <5% F B C M >5p EDS spectrum conforming to laboratory holes or opaque areas iGentitication criteria observed Chrysotile amphiboles Amphibole F = Single Fiber Amosite B = Bundle (<2 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos I M = Matrix NED = No Structures Detected Tremolite Actinolite Non-IdsntiiTed zz CONFIDENTIAL, CITY_21MC1OO_OO3458363 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179163