TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NY’C BOE Volume (liters): 1936 Lab Group #: 5979 Filter Type / Filter Area: MCE 385 mm" Lab Sample #: 6 Grid Opening Size: 0.01124

Client Sample #: 6 Area Examined: 0.04496 mm" Magnification: 20,000 GRID BOX: GRID ED: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/28/01

.Analysis Performed By: -MARK PEYSAKHOV

GO, Structure Structure Type Length ID of Structure N or EDS (Nonadb No F B C M >=05 u >=5|j Chrys Amphibole Nonasb Ambig/ND No Coord Elements)

Struct = > 0.5m > 5T Aspect Ratio Grid acceptance: •7= Positive diffraction pattern propenes conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% parbcuiate coverage >50% coverage ate least 2D unfolded or overlapped grid squares <5% F B C M >5u y= EDS spectrum conforming to laboratory holes or opaoue areas identification criteria observed Chrysotile I AMPHIBOLES t Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) ■ Anthophyllite Non-Asbestos I Tremolite M = Matrix Non-Identified Actinolite NSC = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003458474 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179212