TEM Asbestos air sample results, NYC BOE, Dec 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume filters): 1952 Lab Group #: 6121 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: 12/17/01

Analysis Performed By; ROMAN PEYSAKHOV

30. Structure Structure Type Length ID 01 Structure N or •/ EDS No (Nonadb r E C M >=05 u ■=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5u Elements) 7“

Struct = > 0.5u _> 5:1 Aspect Ratio Grid acceptance: 4 = Positive diffraction pattern properties conforming to '5°°''“ tndissoived filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or ovenapped grid squares <S% F B I C M >5u 4= 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 3 = Cluster (>3 Intersections) Anthophyllite Non-Asbestos M = Matrix Tremolite Actinolite Non-ldennfied NSD = No Structures Detected

CITY_21MC100_003104851

NYC-WTC_000184253