TEM Asbestos air sample results, NYC BOE, Oct 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1936 Lab Group #: 5827 Filter Type / Filter .Area: MCE 385 mm- Lab Sample #: 14 Grid Opening Size: 0.01124 Client Sample #: 14 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20 000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Nor v EDS (Nonadb No F B C M >=05 M >=5 J Chrys Amphibole Nonasb Ambig/ND Elemente)

74 <5p Coord

z 7 fl

Struct = > 0.5(1 > S: 1 Aspect Ratio Grid acceptance:

Positive diffraction pattern properties confonriing to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ale least 20 unfolded or overlapped grid squares <S% F B C M >5p 4" EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite .Ambiguous C = Cluster (>3 Intersections) Anthophyllite I Non-Asbestos Tremolite ■ M = Matrix Non-Identified Actinolite ....... I ..L NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003459048 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179369