TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 7404 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 12 Grid Opening Size: 0.01124

Client Sample #: 12 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20 000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/13/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length IDofStnjcture N or N EDS (Nonadb No F B C >=05 p ~ >=5|J Ch^S Amphtoole Nonasb Ambig/ND r~ /I No Coord Elements) <5m

KI (I f(

Struct = > 0.5p _> 5:1 Aspect Ratio Grid acceptance: >1*= Positive diffraction pattern properties conforming to <50% undissolved filter, overiapped 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 >5m EDS spectrum conforming to laboratoiy holes or opaque areas ioentification criteria observed Chrysotile ■ AMPHIBOLES Amphibole F = Single Fiber Amosite i B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite ' Ambiguous C = Cluster (>3 Intersections) Anthophyllite -i Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471027 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176901