NYC-WTC_000230000

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume niters): 1928 Lab Group #: 7149 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 4 Grid Opening Si/e: 0.01124 Client Sample #: 4 Area Examined: 0.04496 mm^ GRID BOX: ■ Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: ' 3/20/02

Analysis Performed By: P.A ROMAN PEYSAKHOV

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

b/ -J- -4— -4-----

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1

Struct = > 0.5g _> 5:1 Aspect Ratio Grid acceptance: '/= Positive diffraction pattern properties conforming to ■<50% undissolved filler, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped gnd squares <5% F B C M >5p >/= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile I AMPHIBOLY Amphibole F = Single Fiber { Amosite B = Bundle (<3 fibers <1 fiber diameter apart i Crocidolite Ambiguous C = Cluster (>3 Intersections) j Anthophyllite Non-Asbestos ! Tremolite M = Matrix ! Actinolite Non-ldentified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003388601 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000230000