TEM Asbestos air sample results, NYC BOE, Dec 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: OTC BOE Volume /liters): 1928 Lab Group #: 6010 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: 12/1/01

Analysis Performed By: MAI^ PEYSAKHOV

GO Structure Structure Type Length ID of Structure N or EDS (Nonadb No F B M >=05 u Ctirys "Amphiboie Nonasb Ambig/ND ■ No : Coord <5u Elements)

ZZZiEeZ

I Struct = > C.5u -> 5:1 Aspect Ratio Grid acceptance: y= Positive diffraction pafeerri properties conforming to <50% undissolved filter, overiapped or folded Totals iaborato^ identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5|J 'J- EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite i B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite i Ambiguous C = Cluster {>3 Intersections) Anthophyllite ! Non-Asbestos I Tremolite M = Matrix Non-Identified Actinolite NSD = Nc Structures Detected

CONFIDENTIAL, CITY_21MC100_003458569 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179274