TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1936 Lab Group #: 7162 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 17 Grid Opening Size: 0.01124 Client Sample #: 17 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20 000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/21/02

Analysis Performed By: MARK PEYSAKHOV

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

I

Struct = > 0.5p -> 5:1 Aspect Ratio Gnd acceptance: V= Positive diffraction pattern properties conlorming to <50% undissolvea Alter, overlapped or folded Totals laboratory identification criteria obsen/ed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5p y = EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 Abers <1 Aber diameter apart Crocidolite Ambiguous C = Cluster (>3 IntersecAons) j Anthophyllite j Non-Asbestos : Tremolite i M = Matrix Non-ldentified I Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_0 03466969 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180417