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 #: 9 Grid Opening Size: 0.01124 Client Sample #: 9 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20 000 GRID ID: Accelerating Voltage: 100 KeV #GridOpeniiig^ 4

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure T ype Length ID of Structure N or 4 ■ EDS (Nonaflh No F B C M -ur,„ >=5)j Chrys Amphibole Nonasb Ambig/ND No Coord Elements) <5u

5'1- ' X 2- .Z zX----

Struct “ .> 0.5p >5:1 Aspect Ratio Grid acceptance:

7= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate leas: 20 unfolded or overlapped grid squares <5% F B C M >5p >= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Clnysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B > Bundle (<3 fibere <1 fiber diameter apart Crocidolite Ambiguous C : Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Actinolite Non-Identified ..J. NSD - No Structures Detected

CONFIDENTIAL, CITY_21MC100_003459043 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179365