TEM asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet ClientJNarne: NYC BOE Volume (liters): 1920 Lab Group #: 6986 Filter Type / Filter Area: MCE 385 mm- Lal3 S^yTij31e^ 13 Grid Opening Size: 0.01124

CJjent SanT2lie^ 13 Area Examined: 0.04496 mm-

GRID BOzX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/8/02

Analysis Performed By: MARK PEYSAKHOV

GO, Structure Sfructure Type Length ID of Structure N or’ V EDS No (Nonadb F B C M ■=5|j Chrys Amphibole Nonasb Ambig/ND No Coord <5|J Elements’ ’

O'

i 1

Struct = > 0.5|j > 5:1 Aspect Ratio Grid acceptance: V= 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 >5p EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AfyiPHlBOLES 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-ldentified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468411 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181380