TEM Asbestos air sample results, NYC BOE, Dec 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1904 Lab Group #: 6081 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 3 Grid Opening Size: 0.01124 Client Sample #: 5 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID IP: 2 Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 12/12/01

Analysis Performed By: MARK PEYSAKHOV

GO, Structure Structure Type Length ID of Structure N or EDS No (Nonadb F B C M >=05 p >=5|J Chrys Amphibole Nonasb AmbigZND No Coord <5p Elements)

3 — -—

Struct = >0.5p >5:1 Aspect Ratio Grid acceptance: Positive difIraction 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 >5p \ = 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 = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003467421 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180709