TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 7444 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 11 Grid Opening Size: 0.01124

Client Sample #: 11 Area Examined: 0.04496 mm*

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/17/02 Analysis Performed By: ^/f

ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or v (Nonadb j No F B C M >-05 p Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

if -U— -Jc—

Struct = > 0.5p >5:1 Aspect Ratio Grid acceptance;

V- 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 crd squares <5% f 1 B I C j M , >5p v= EDS spectrum conforming to laooratory holes or opaque areas L Identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite 3 = Bundle {<3 fibers <1 fiber diameter apart Crocidolite Ambiguous j C = Cluster (>3 Intersections; Anthophyllite i Non-Asbestos ( Tremolite M = Manx Actinolite i Non-Identified ] NSD - No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471114 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176955