TEM Asbestos air sample results, NYC BOE, June 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 8263 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 11 Grid Opening Size: 0.01124

Client Sample 11 Area Examined: 0.04496

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 6/24/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 9 EDS No (Nonadb F B C M >=05 p >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

Struct = > 0.5(1 ,> 5:1 Aspect Ratio Grid acceptance: ■/= 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 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 Non-Asbestos Tremolite M = Matnx Non-Identified Actinolite NSD = No Structures Detected

CITY_21MC100_003105954

NYC-WTC_000185036