Asbestos air sample TEM analysis report for 99 Church Street,

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: ATC Volume (liters): 1300 Lab Group #: 6804 Filter Type / Filter Area: MCE 385 mm' Lab Sample #: 8 Grid Opening Size: 0.01124 Client Sample #: 8 Area Examined: 0.06744 mm'

GRID BOX: j.c 7 Magnification: 20,000 GRID ID: 3 Accelerating Voltage: 100 KeV # Grid Openings: 6 Analysis Date: 2/24/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or EDS No M >051j (Nonadb F B C >=5p Chrys Amphibole Nonasb AmbigIND Elements) No Coord <5u

3? Z -z. f

4 G — Q2 If fSJ !i

Struct = > 0.5µ > 5:1 Aspect Ratio Grid acceptance: '= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped 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 >5N v=

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 Non-Asbestos Tremolite M = Matrix Non-Identified Actinoiite NSD = No Structures Detected

NYC-WTC 000124335