TEM asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1936 Lab Group #: 5844 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 10 Grid Opening Size: 0,01124 Client Sample #: 10 Area Examined: --------- —— 0.04496

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: n/7/oi Analysis Performed By: /Q ROMAN PEYSAKHOV

GO structure Structure Type Length ID of Structure N or N EDS No (Nonadb F B C M >=:05|J >=5|J Chrys Amphibole ) Nonasb Ambig/ND No Coord <5p I tlements)

7£ !l 2 H

Struct = > O.du >3:1 Aspect Ratio Grid acceptance:

Positive diffraction pattern properties conforming to <50% undisso^sd filter, overlapped or folded Tot^ <10% particuiEte coverage >50% coverage ate laboratory identification criteria observed least 20 unfolded or overlapped grid squares <5% F B C M [ >5|J ■I- EDS soectrum conforming to laboratory fioles or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber i Amosite B = Bundle (<3 fibers <1 fiber diarneter apart ) Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003459135 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179416