TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters'): 1840 Lab Group #: 7045 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: 11 Grid Opening Size: 0.01124 Client Sample #: 11 Area Examined: 0.04496 mm’

GREP BOX: Magnification: 20 000 GRID ID: << Accelerating Voltage; 100 KeV # Grid Openings: 4 Analysis Date: 3/12/02

Analysis Performed By: MARK PEYSAKHOV

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

si.

)

n H

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 >5p 1 •7= 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

CITY_21MC100_003108664

NYC-WTC_000185909