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 #: 5868 Filter Type / Filter .Area: MCE 385 mm^ Lab Sample #: 16 Grid Opening Size: 0.01124 Client Sample 16 Area Examined: 0.04496 rnin-

GRID BOX: Magnification: 20 000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/10/01

Analysis Performed By: MARK PEYSAKHOV

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

Struct = > O.Sji > 5:1 Aspect Ratio Grid acceptance: ^-Positive diffraction pattern properties conforming to <50% undissolved filter, overtapped 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 AMPHIBOLES' Amphibole F : Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite NomAsbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected !___________ I CONFIDENTIAL, CITY_21MC100_003459104 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179402