NYC-WTC_000215751

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume /liters): 1920 Lab Group #: 6673 Filter Type / Filter Area: MCE 385 Lab Sample #: 12 Grid Opening Size: 0.01124 Client Sample #: 12 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRIDED: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/14/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 4 EDS No >=05 p Amphibole (Nonadb F B C M Chrys Nonasb Ambig/ND ' No Coord <5p Elements)

z- _

Struct = > 0.5pi > 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 >5m ^/= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber I Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous • C = Cluster (>3 Intersections) Anthoptiyllite Non-Asbestos M = Matrix Tremolite Actinolite Non-Identified NSD = No Structures Delected

CITY_21MC100_002875440

NYC-WTC_000215762