TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 7404 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 14 Grid Opening Size: 0.01124

Client Sample #: 14 Area Examined: 0.04496 mm-'

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/13/02 Analysis Performed By: ________ /Qz

ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Stnjcture Norv EDS (Nonadb No F B C M >=05 M >=5)j Chrys Amphibole Nonasb Ambig/ND / No Coord <5u Elements)

72^ iz __ // z/

Struct = > 0.5u > 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 I >5u V= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile ‘ AMPHIBOLES ' Amphibole F = Single Fiber Amosite 8 = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471029 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176902