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 niters): 1920 Lab Group #: 6068 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 16 Grid Opening Size: 0.01124 Client Sample #: 18 Area Examined: 0.04496 mm’ GRID BOX: Magnification: 20 000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 12/9/01

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length 10 of Structure N or 7 cDS No (Nonadb F B C M I >=05 p >=5p Chrys Amphibole Nonasb Ambig/ND No Coord I <5p Elsmenis) T fe" ' ^2 u AB sfl--- f___ 6 I

I Struct = > 0.5p -> 5:1 Aspect Ratio Grid acceptance: Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed EDS spectrum conforming to laboratory least 20 unfolded or overlapped grid squares <5% holes or opaque areas _____ P B C ! M >5u

identification criteria observed Chrysotile i amphiboles" Amphibole i F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apan Crocidolite Ambiguous j C = Cluster (>3 Intersectiens) Anthophyllite Non-Asbestos j T remolite M = Matrix Non-Identified I Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003467412 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180706