TEM Asbestos air sample results, NYC BOE, Feb 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1848 Lab Group #: 6537 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: 7 Grid Opening Size: 0.01124 Client Sample #: 7 Area Examined: 0.04496 mm’

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/2/02

Analysis Performed By: MARKPEYSAKHOV

GO. Structure Structure Type Length ID of Structure Nor\ EDS No >=05 p ;>=5m (Nonadb F B C M Chrys Amphibole Nonasb Ambig/ND No Goord <5p Elements)

r

Struct = > 0.5|i > 5:1 Aspect Ratio Grid acceptance: >1= 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 grid squares <5% F B C M >5m •7= EDS spectrum conforming to laboratory holes or opaque areas identification cnteria observed Chrysotile ] AMPHIBOLES Amphibole F = Single Fiber 1 Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos T remolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003433604 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175841