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): 1840 Lab Group #: 7278 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: 3/31/02

Analysis Performed By: / A // ROMAN PEYSAKHOV

GO. ' Structure Structure Type Length ID of Structure Nory EDS No (Nonadb F B C M >=05 (J >=5p Chrys Amphibole Nonasb AmbigyND : No' Coord <5m Elements)

n V __ U- l/

Struct = > 0.5)1 > 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 >5m '/= EDS spectrum conforming to laboratory holes or opaque areas dendfication criteria obsen/ed Chrysotile ; AMPHIBOLES ; Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 IntersecdonsI Anthophyllite Non-Asbestos Tremolite M = Matrix Non-ldentified Acdnolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003470722 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176693