TEM Asbestos air sample results, NYC BOE, Apr 29 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 7567 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 11 Grid Opening Size: 0.01124 Client Sample #: 11 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/29/02

Analysis Performed By: MARK PEYSAKHOV

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

.J

Struct = > 0.5li > 5:1 Aspect Ratio Grid acceptance:

y = Positive diffraction pattern properties conforming to <50% undissolved filter, ovedapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% B C M -;.. V= EDS soectrum conforming to laboratory holes or opaque areas _________ identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite 8 = Bundle i<3 fibers <1 fiber diameter apart Crocidolite Ambiguous I I C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos I Tremolite M = Matrix j Non-ldentified Actinolite NSD = No Structures Detectec

CONFIDENTIAL, CITY_21MC100_003471343 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177117