TEM Asbestos air sample results, NYC BOE, Dec 2001

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE Volume filters): 1928 Lab Group #: 6010 Filter Type / Filter Area: MCE 385 mrr/ Lab Sample #: 21 Grid Opening Size: 0.01124 Client Sample #: 21 Area Examined: 0.04496 mm^

GRIP BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 12/1/01

Analysis Performed By: MARK PEYSAKHOV

GO, Structure Structure Type Length ID of Structure N or EDS (Nonadb No F B C M >=05 u ' :>=5p Cltrys fimphtote Nonasb Ambig/ND No Coord <5|J Elements)

______ i Ml Struct = > 0.5u ,>5:1 Aspect Ratio Grid acceptance:

y- Positive diftraction 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 ovedapped grid squares <5% F B C M >51J y- EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chry'sotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart i Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix K on-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003458576 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179280