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 #: 5820 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: 6 Grid Opening Size: 0,01124 Client Sample #: 6 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure NorN £DS (Nonadb No F B C M >=05 p >-'5p Chrys Amphiboie Nonasb Ambig/ND No Coord <5p Elements)

3 4 ~r

Struct = > 0.5(1 .> 5:1 Aspect Ratio Grid acceptance: ■'J- Positive diffraction pattern properties conforming to <50% undissDived filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ats least 20 unfolded or overlapped grid squares <5% F B C M >5|j 9= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile ) AMPHIBOLES I 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 NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003459019 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179357